JP2017109733A5 - - Google Patents

Description

Fuel tank filler cap

The present invention relates to a filler cap of a fuel tank that opens and closes a fuel filler provided in an automobile or the like.

  Heretofore, it has been necessary to take in the atmosphere only by the volume of fuel consumed in the fuel tank in the filler cap of the fuel tank of the internal combustion engine provided in the automobile etc. A passage is provided.

  Therefore, when the fuel tank provided in the automobile or the like is inclined at a predetermined angle or more, there is a risk that the fuel leaks from the air passage and the fuel is ignited.

  Therefore, the present applicant reliably suppresses the disadvantage that the fuel in the fuel tank flows out from the air passage provided in the main body of the filler cap when the fuel tank is inclined to a predetermined angle. Patent Document 1 and Patent Document 2 propose a fuel tank filler cap that can be used.

However, in Patent Documents 1 and 2 described above, when the fuel tank is inclined to a predetermined angle and the fuel flows into the cylinder main body, a float constituting a valve mechanism provided in the air passage Floats to the outside, and the ball which similarly constitutes the valve mechanism is pressed against the reduced diameter portion of the cylinder main body by the float to close the air passage, but the fuel tank is not inclined as described above In the state, the harmful gas evaporated from the fuel is released to the outside of the fuel tank from the gap between the piston and the inner surface of the cylinder main body, causing environmental pollution, and the fuel consumption can not be improved. was there.

Patent No. 5030152 U.S. Pat. No. 7,823,611

Therefore, according to the present invention, environmental pollution can be prevented without releasing the harmful gas evaporated from the fuel or the fuel to the outside of the fuel tank until the pressure in the fuel tank reaches a predetermined value, and fuel consumption can be improved. It is a first object of the present invention to provide a fuel tank filler cap that can also be designed. Further, when the fuel tank is flowed said fuel from said fuel tank is inclined, the fuel can prevent environmental pollution without releasing to the outside of the fuel tank, a fuel tank can be achieved also improve the fuel efficiency It is a second object to provide a filler cap for

For this reason, according to the first aspect of the present invention, an air passage for connecting the inside and the outside of the fuel tank is provided in a cap body which is attached to a filler port of the fuel tank and which comprises an outer lid and an inner lid; A fuel tank cap provided with a valve mechanism and
The valve mechanism unit
A cylindrical first space provided at a substantially central position on the inner surface side of the inner lid and communicating with the inside of the fuel tank, a second space having a frusto-conical shape communicating with the first space from above, and the second space And an opening communicating with the outside of the fuel tank is formed in the upper surface, and a plurality of projections projecting inward at a distance from the upper surface in the vertical direction are formed on the inner side surface forming the second space. A second air passage is formed by forming a plurality of concave portions which are long in the vertical direction and spaced apart in the first air passage or the inner side surface which is formed between the convex portions by forming a portion. The tube body,
It has a bottomed hollow cylindrical shape having an upper surface and an open lower surface, and a large diameter portion at a lower portion accommodated in the first space and an upper small diameter at an upper portion exhibiting an outer shape accommodated in the second space. A lifting member comprising
Or the outer periphery in the lateral direction is in point contact with the plurality of ridges projecting on the inner side surface of the cylinder main body which is placed on the upper surface of the small diameter portion of the elevating member and which forms the second space A spherical valve body whose outer periphery in the lateral direction is in line contact with the inner side surface of the cylinder main body forming the second space;
It arranges in the space of the large diameter part of the raising and lowering member, pushes up the raising and lowering member, and presses the lateral periphery of the valve body placed on the small diameter part to the plurality of ridges Urge the point member into contact or push up the raising and lowering member to press the outer periphery of the valve body placed on the small diameter portion against the inner surface of the cylinder main body for line contact And a biasing body for biasing the
The lateral periphery of the valve body or the lateral periphery of the valve body where the lateral periphery of the valve body on the elevating member does not point contact between points where the lateral portions of the valve body press against the plurality of ridges and make point contact The surface formed by connecting the center of the valve body and the outer periphery in the lateral direction is extended outward, with the outer peripheral portion not in line contact between the portions where the outer periphery presses against the inner surface and makes line contact. Of the first air passage or the center of the valve body which is a cut of the first air passage obtained by cutting the inner surface forming the first air passage and the convex portions on both sides of the inner surface And a second communication port, which is a cut port of the second air passage, obtained by cutting the surface for forming the recess forming the second air passage with a surface extending outward, which is a surface formed by connecting with the outer periphery of the second air passage. Make up the valve
A state in which the lateral periphery of the valve body on the elevating member is in point contact with the plurality of ridges by pressing against the plurality of ridges, or the lateral periphery of the valve body on the elevating member is the cylinder main body In the state in which the fuel in the fuel tank is in line contact with the inner surface of the fuel tank, the pressure in the fuel tank is increased by vaporized gas from the fuel in the fuel tank, and a portion or a line A first passage resistance or a second passage resistance set by the size of the area of the valve portion constituted by the portion of the outer periphery not in contact with the lateral direction and the first communication port or the second communication port and the valve When the pressure reaches a predetermined value set by the magnitude of the biasing force of the biasing body which is equal to or more than the total weight of the body and the elevating member, the pressure in the first air passage or against the first passage resistance. In the second air passage against the second passage resistance, the The chemical gas rises, passes through the valve portion, and the rising vaporized gas lowers the valve body and the elevating member against the biasing force of the biasing body to open the valve portion. Thus, the excessive pressure in the fuel tank is released to the outside of the fuel tank through the first space, the second space and the opening.

According to a second aspect of the present invention, there is provided an air passage for connecting the inside and the outside of the fuel tank, and a valve in the air passage, in a cap main body attached to a filler port of a fuel tank and comprising an outer lid and an inner lid. A fuel tank filler cap provided with a mechanism portion,
The valve mechanism unit
A cylindrical first space provided at a substantially central position on the inner surface side of the inner lid and communicating with the inside of the fuel tank, a second space having a frusto-conical shape communicating with the first space from above, and the second space And an opening communicating with the outside of the fuel tank is formed in the upper surface, and a plurality of strips extending inward in the vertical direction and spaced apart at the first inner side surface forming the second space. The second air passage is formed by forming a plurality of concave portions which are long in the vertical direction and spaced from each other in the first air passage or the first inner side surface formed between the respective convex portions. A cylinder main body on which the
A bottomed hollow cylindrical shape having an upper surface and an open lower surface is formed to form a space inside, and a large diameter portion of a lower portion stored in the first space and an outer shape stored in the second space are conical A lifting member comprising a trapezoidal upper portion and a small diameter portion;
The outer periphery is point-contacted with the plurality of ridges projecting on the first inner side surface of the cylinder main body which is placed on the upper surface of the small diameter portion of the elevating member and which forms the second space A spherical valve body whose outer periphery in the lateral direction is in line contact with the first inner side surface of the cylinder main body forming the second space;
It arranges in the space of the raising and lowering member, pushes up the raising and lowering member, and presses the outer periphery of the lateral direction of the valve mounted on the small diameter portion against the plurality of ridges to make a point contact Of the valve body placed on the small diameter portion by pressing the lifting member so as to press the outer periphery of the valve body placed on the small diameter portion into line contact with the first inner side surface of the cylinder main body A coil spring to bias the
A small diameter portion loosely inserted in the coil spring housed in the space of the elevating member and in which a small diameter space is formed, and a step for supporting the lower portion of the coil spring on the upper surface with a diameter larger than the small diameter portion A blow-up member having a hollow cylindrical shape, and a large-diameter portion having a diameter larger than that of the step portion and in which a large-diameter space communicating with the small-diameter space is formed;
The lower part of the blowup member has a communication port communicating with the small diameter space and the fuel tank, and has a circular shape in a plan view, for reducing the pressure of vaporized gas or fuel from the fuel tank. And a cylindrical upper portion provided upright at the upper central portion of the lower portion, the upper peripheral portion of the lower portion being in contact with the lower surface of the step portion of the blow-up member; The lower portion is housed, and the upper portion comprises a resistance member housed in the small diameter space in a state separated from the second inner side surface forming the small diameter space of the blowing-up member,
The lateral periphery of the valve body or the lateral periphery of the valve body where the lateral periphery of the valve body on the elevating member does not point contact between points where the lateral portions of the valve body press against the plurality of ridges and make point contact The outer periphery is a portion formed by connecting the center of the valve body and the outer periphery in the lateral direction to the outside, with the outer peripheral portion in the lateral direction not contacting the line between the portions where the outer periphery presses against the first inner surface and makes line contact A first communication port or the valve body which is a cut port of the first air passage obtained by cutting the first inner side surface forming the first air passage and the convex portions on both sides of the first inner side surface And a cut surface of the second air passage obtained by cutting the surface for forming the concave portion forming the second air passage with a surface extending outward from the surface formed by connecting the center of the frame and the outer periphery in the lateral direction. The second communication port and a valve unit
A state in which the lateral periphery of the valve body on the elevating member is in point contact with the plurality of ridges by pressing against the plurality of ridges, or the lateral periphery of the valve body on the elevating member is the cylinder main body The pressure in the fuel tank is increased by the vaporized gas from which the fuel in the fuel tank has evaporated or the expanded fuel in a state of being in line contact with the first inner side face of the A first passage resistance set by the size of the area of the valve portion configured by the portion of the outer periphery in the lateral direction or the portion of the outer periphery in the lateral direction not in line contact and the first communication port or the second communication port Alternatively, when the pressure of the predetermined value set by the second passage resistance and the magnitude of the biasing force of the coil spring greater than the total weight of the valve body and the elevating member is reached, the communication port of the resistance member, the blowup Small diameter space of the member, in front A gap between the lower end of the lifting member and the large diameter portion of the blowing member and a gap between the lifting member and the cylinder main body against the first passage resistance in the first air passage or the second passage resistance The vaporized gas or the expanded fuel rises in the second air passage against the pressure, passes through the valve portion, and the rising vaporized gas or the expanded fuel is applied to the biasing force of the coil spring. The valve body and the raising and lowering member are lowered against this, and the valve part is opened to open the excessive pressure in the fuel tank to the outside of the fuel tank via the first space, the second space and the opening. Release.

According to a third aspect of the present invention, there is provided an air passage for connecting the inside and the outside of the fuel tank, and a valve provided in the air passage, in a cap main body attached to the filler port of the fuel tank and comprising an outer lid and an inner lid. A fuel tank filler cap provided with a mechanism portion,
The valve mechanism unit
A cylindrical first space provided at a substantially central position on the inner surface side of the inner lid and communicating with the inside of the fuel tank, a second space having a frusto-conical shape communicating with the first space from above, and the second space And an opening communicating with the outside of the fuel tank is formed in the upper surface, and a plurality of projections projecting inward at a distance from the upper surface in the vertical direction are formed on the inner side surface forming the second space. A second air passage is formed by forming a plurality of concave portions which are long in the vertical direction and spaced apart in the first air passage or the inner side surface which is formed between the convex portions by forming a portion. The tube body,
A bottomed hollow cylindrical shape having an upper surface and an open lower surface is formed to form a space inside, and a large diameter portion of a lower portion stored in the first space and an outer shape stored in the second space are conical A lifting member comprising a trapezoidal upper portion and a small diameter portion;
A state in which the outer periphery in the lateral direction can point-contact the plurality of ridges projecting on the inner side surface of the cylinder main body forming the second space, or the inner side surface of the cylinder main body forming the second space A spherical valve body mounted on the upper surface of the small diameter portion of the elevating member in a state where the outer periphery in the lateral direction can make line contact;
The outer periphery of the valve body placed on the small diameter portion is pushed against the plurality of ridges by pushing up the elevation member so that point contact can be performed or the small diameter portion is pushed up so that the elevation member can be raised. A coil spring disposed in the space of the elevating member so that the lateral outer periphery of the valve body placed on the upper side can be pressed against the inner side surface of the cylinder main body to be in line contact;
A small diameter portion loosely inserted in the coil spring housed in the space of the elevating member and in which a small diameter space is formed, and a step for supporting the lower portion of the coil spring on the upper surface with a diameter larger than the small diameter portion And a large diameter portion having a diameter larger than that of the step portion and forming a large diameter space communicating with the small diameter space and housed in the space formed on the bottom wall of the inner lid; A blowing member that exhibits
The bottom surface of the inner lid has a circular shape in plan view and includes a communication port communicating with the large diameter space of the blow-up member and the fuel tank, and in contact with the lower surface of the large-diameter portion of the blow-up member And a resistance member housed in the space formed on the wall,
The lateral periphery of the valve body or the lateral periphery of the valve body where the lateral periphery of the valve body on the elevating member does not point contact between points where the lateral portions of the valve body press against the plurality of ridges and make point contact The surface formed by connecting the center of the valve body and the outer periphery in the lateral direction is extended outward, with the outer peripheral portion not in line contact between the portions where the outer periphery presses against the inner surface and makes line contact. Of the first air passage or the center of the valve body which is a cut of the first air passage obtained by cutting the inner surface forming the first air passage and the convex portions on both sides of the inner surface And a second communication port, which is a cut port of the second air passage, obtained by cutting the surface for forming the recess forming the second air passage with a surface extending outward, which is a surface formed by connecting with the outer periphery of the second air passage. Make up the valve
When the coil spring is compressed with an urging force less than the total weight of the valve body and the elevating member, the elevating member and the valve body are lowered, and the lateral direction of the valve body on the elevating member The valve portion is not in point contact with a plurality of ridges of the outer peripheral portion or the lateral periphery of the valve body on the elevating member is not in line contact with the inner side surface of the cylinder main body In the open state, when the fuel tank is inclined, the weight applied to the coil spring of the elevating member and the valve body is reduced according to the inclination angle, and the coil spring is extended in length When the valve body reaches a predetermined length, the valve body contacts the convex portion of the inner side surface of the cylinder main body or contacts the inner side surface, and the fuel is depressurized at the communication port of the resistance member. And the blow-up member From between the 径空 then injected into the space of the lifting member, I biasing force coupled with the coil spring, to push up the valve body and the lifting member, characterized in that closing the valve portion.

According to the present invention, environmental pollution can be prevented without releasing the harmful gas evaporated from the fuel or the fuel to the outside of the fuel tank until the pressure in the fuel tank reaches a predetermined value, and fuel consumption can be improved. It is also possible to provide a fuel tank filler cap that can also be designed. Further, when the fuel tank is flowed said fuel from said fuel tank is inclined, the fuel can prevent environmental pollution without releasing to the outside of the fuel tank, a fuel tank can be achieved also improve the fuel efficiency it is possible to provide the fuel cap.

FIG. 1 is a schematic view of a car to which a fuel tank filler cap of the present invention is applied. It is a top view of the said filler cap. It is a back view of the said filler cap. It is a longitudinal cross-sectional view of the state which decomposed | disassembled the outer cover and inner cover which comprise the said filler cap. It is a back view of the said outer cover which comprises the said filler cap. It is a surface view of the inner lid which constitutes the filler cap. It is a longitudinal cross-sectional view and top views of a cylinder main body and each component accommodated in this cylinder main body, longitudinal cross-sectional view of the said cylinder main body (A), longitudinal cross-sectional view of a valve body (B), longitudinal cross-sectional view of raising / lowering member (C), a longitudinal sectional view (D) of the elevating member according to another embodiment, a longitudinal sectional view (E) of the elevating member according to the second other embodiment, a back view (F) of the elevating member, a coil It is a longitudinal cross-sectional view (G) of a spring, the top view (H) of a spring, the XX sectional view (I) of the top view (H) of the spring, and a side view (J) of a rivet. It is a longitudinal cross-sectional view of the said filler cap. It is a longitudinal cross-sectional view of the principal part of the state in which the horizontal periphery of the said valve body point-contacted with the top part of the several convex part protruded to the inner surface of the 2nd side wall of the said cylinder main body. It is a longitudinal cross-sectional view of the principal part of the state where the said valve body and the said raising / lowering member fell. Bottom view (K) cross-sectioned at a position where the lateral periphery of the valve body is in point contact with the apexes of the plurality of projections projecting on the inner side surface of the second side wall of the cylinder main body and the same It is the bottom view (L) which carried out the cross section in the state where the above-mentioned valve element was removed in a position. It is a longitudinal cross-sectional view of the filler cap of the structure attached to a filler port by a screw type. It is a longitudinal cross-sectional view of the principal part in the state where the perimeter of the above-mentioned transverse direction of the above-mentioned valve body line-contacted with the inner surface of the above-mentioned 2nd side wall of the above-mentioned cylinder main part. Bottom view (M) cross sectioned at a position where the lateral outer periphery of the valve body is in line contact with the inner side surface of the second side wall of the cylinder main body and cross section when the valve body is removed at the same position Bottom view (N). A second embodiment is shown showing an example in which the valve body and the elevating member are integrally formed, and a plurality of strips in which the outer periphery in the lateral direction of the valve body portion protrudes on the inner side surface of the second side wall of the cylinder main body It is a longitudinal cross-sectional view of the principal part of the state which carried out point contact to the said peak part of the said convex part. FIG. 16 is a longitudinal cross-sectional view of the main part of the second embodiment of FIG. 15 in which the elevating member is lowered. A third embodiment showing an example in which the valve body and the elevating member are integrally formed is shown, and a plurality of strips in which the outer periphery in the lateral direction of the valve body portion protrudes on the inner side surface of the second side wall of the cylinder main body It is a longitudinal cross-sectional view of the principal part of the state which carried out point contact to the said peak part of the said convex part. In 3rd Embodiment of FIG. 17, it is a longitudinal cross-sectional view of the principal part of the state which the said valve body part descend | falled. It is a longitudinal cross-sectional view of the cylinder main body in the said filler cap of 2nd Embodiment, and each component accommodated in this cylinder main body, a top view, a bottom view, It is a longitudinal cross-sectional view (AA) of the said cylinder main body, the said cylinder The bottom view (AB) of the cross section of the side wall of the main body, the longitudinal sectional view (B) of the valve body, the longitudinal sectional view (C) of the elevating member, the back view (F) of the elevating member Longitudinal section (G), longitudinal section of blow-up member (OA), plan view of blow-up member (OB), bottom view of blow-up member (OC), bottom view of first resistance member (PA), the first 2 Plan view of resistance member (PB), longitudinal sectional view of first resistance member (PC), longitudinal sectional view of second resistance member (QA), plan view of second resistance member (QB), lid A top view (H) of the lid, an X-X sectional view (i) of the top view (H) of the lid, and a side view (j) of the rivet It is a longitudinal cross-sectional view of the said filler cap of 2nd Embodiment which shows the state which the said valve body has raised. It is a longitudinal cross-sectional view of the said filler cap of 2nd Embodiment which shows the state in which the said valve body is descend | falling. It is a longitudinal cross-sectional view of the said filler cap of 2nd Embodiment which shows the state which the said valve body inclines. It is a longitudinal cross-sectional view of the said filler cap of 3rd Embodiment which shows the state which the said valve body is descend | falling. It is a longitudinal cross-sectional view of the said filler cap of 3rd Embodiment which shows the state which the said valve body inclines. It is the schematic of the motor vehicle to which the valve body apparatus of the fuel tank was applied. It is a longitudinal section of each part in a valve mechanism object of a 2nd embodiment, a top view, and a bottom view, and is a front view of a screw (R), a longitudinal section of an upper lid (SA), a top view of the upper lid (SB) A bottom view (SC) of the upper lid, a longitudinal sectional view of the filter (TA), a plan view of the filter (TB), a longitudinal sectional view of the storage member (UA), a plan view of the storage member (UB), the storage Bottom view of member (UC), longitudinal cross section of cylinder main body (WA), plan view of cylinder main body (WB), bottom view of cylinder main body (WC), longitudinal cross sectional view of mounting member (XA), mounting They are a top view (XB) of a member, and a bottom view (XC) of the attachment member. The valve part is open and it is a longitudinal section showing the horizontal state of the valve mechanism object of a 2nd embodiment. It is a longitudinal cross-sectional view which shows the state which the said valve part has closed and is inclining the valve mechanism body of 2nd Embodiment. It is a longitudinal cross-sectional view which has the said valve part closed and shows the horizontal state of the valve mechanism body of 2nd Embodiment.

(1) First embodiment of the filler cap (see FIGS. 1 to 14)
(1-1) First Embodiment of the Cylinder Body 16 (Valve Part VA, See FIGS. 1 to 12)
Hereinafter, embodiments of the present invention will be described based on the drawings. First, as shown in FIG. 1, the filler cap 10 of the fuel tank 100 in the present embodiment is a car, agricultural machinery, a generator, a lawn mower, a motorcycle, a ship, a construction machine, a road construction machine, etc. Are generically referred to as “automobile 101.” The fuel port 100 of the fuel tank 100 for supplying fuel (in the present embodiment, gasoline) to the engine 99 is opened and closed. A carburetor 95 is connected by piping between the fuel tank 100 and the engine 99.

  As shown in FIGS. 2, 3 and 4, the filler cap 10 has an outer case (hereinafter referred to as an “outer cover”) having a housing space 12 </ b> A having a concave and convex portion 11 for manual operation formed on a side wall 12 </ b> C. A cap main body 14 configured of an inner case (hereinafter referred to as "inner lid") 13 mounted in the storage space 12A of the outer lid 12; The inner lid 13 is provided with a valve mechanism portion described later. The uneven portion 11 is formed by alternately repeating the convex portion 11A and the concave portion 11B.

  The outer lid 12 has a substantially bottomed cylindrical shape having an upper wall 12B and the side wall 12C, and a filter 38 described later is contained in the storage space 12A formed by the upper wall 12B and the side wall 12C. The inner lid 13 is attached to the outer lid 12 in a state in which the inner lid 13 to which is attached is accommodated.

  And as shown in FIG.4, FIG6 and FIG.7, the hollow cylinder main body 16 is integrally provided integrally with the bottom wall 13A of the said inner lid 13 in the approximate center position of the inner surface side of the said inner lid 13. . The cylinder main body 16 is provided with a hollow cylindrical main body portion 16A provided with a cylindrical first space SI, a second space S2 having a truncated cone shape on the upper portion of the main body portion 16A, and the outer shape exhibits a truncated cone shape And an air passage forming portion 16B. However, as described above, although the cylinder main body 16 may be formed integrally with the bottom wall 13A of the inner lid 13 from the beginning, the independent cylinder main body 16 may be formed on the bottom wall 13A of the inner lid 13. It may be fixed.

  The cylinder main body 16 has a first side wall 16C from below, a lower horizontal wall 16D provided on the upper side of the first side wall 16C, a second side wall 16E provided on the upper side of the lower horizontal wall 16D, and a second side wall An upper horizontal wall having an opening S3 formed at its central portion, provided at the upper part of 16E and communicating the space (including the second space S2) in the cylinder main body 16 with the outside of the fuel tank 100 (atmosphere) It consists of 16F. The second side wall 16E has an inner side surface 16E1 whose inner diameter decreases as it goes upward.

Then, as shown in FIG. 8, in a state where the inner lid 13 is attached to the outer lid 12 in a state of being stored, the cylinder in the space 12S formed on the back surface of the upper wall 12B of the outer lid 12. The upper horizontal wall 16F of the main body 16 is stored at an interval so as not to abut on the back surface of the upper wall 12B .

A plurality of first air passages 15 communicating with the opening S3 and the second space S2 are formed in the second side wall 16E of the cylinder main body 16. More specifically, the inner side surface 16E1 (the inner side surface forming the second space S2) of the second side wall 16E extends in the vertical direction with a predetermined interval, and the transverse plane has, for example, a triangular shape. A plurality of (for example, eight) ridges 16T are formed. Further, the convex portion 16T has the same height along the inner side surface 16E1 , and protrudes into the second space S2, and the first air passage 15 is formed between the convex portions 16T. . That is, the convex portion 16T and the first air passage 15 are alternately formed on the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16.

  In FIGS. 7 to 11, reference numeral 22 denotes a valve body formed of a stainless steel spherical ball, and as described later, the elevating member 23 so that a part of the valve body can be in contact with the convex portion 16T. While being placed on the upper surface of the small diameter portion 23B, the second space S2 is accommodated.

  The elevating member 23 for mounting and supporting the valve body 22 has a bottomed hollow cylindrical shape having an upper surface and an open lower surface, and a large diameter of a lower portion housed in a cylindrical first space S1. The portion 23A and the small diameter portion 23B having a truncated cone shape in the outer shape of the upper portion housed in the second space S2 are provided. When the valve body 22 is placed on the small diameter portion 23B, the upper portion thereof faces the opening S3.

  Then, in the space 23S formed in the elevating member 23, a coil spring (hereinafter referred to as "spring") 17 which is an urging body that urges the elevating member 23 in a stretched state so as to raise it is referred to as "spring". It is stored.

  Then, a rivet 34 is inserted into the fixing hole 13G (see FIG. 6) formed in the bottom wall 13A of the inner lid 13 and the fixing hole 33A formed in the spring 33 as an attachment member, and the bottom wall 13A The spring 33 is fixed to the The spring 33 is made of a metal material which is hard to rust and which is not dissolved by the fuel.

  Then, an opening 33B constituting a communication passage is opened at a central portion of the spring 33 made of a leaf spring material, and an air passage communicating with the space 23S of the elevating member 23 and the fuel tank 100 is formed. Ru. The spring 33 is a passage forming body that forms the air passage and the like, and a fixture for attaching and fixing the filler cap 10 (the cap main body 14) to the filler port 98 of the fuel tank 100. It is also.

  Accordingly, the elevating member 23 in which the valve body 22 is placed on the upper surface of the small diameter portion 23B and the spring 17 is accommodated in the space 23S is the first space S1 and the second space S1 of the cylinder main body 16. The bottom wall 13A of the inner lid 13 is received by being inserted into the fixing hole 13G of the bottom wall 13A of the inner lid 13 and the fixing hole 33A of the spring 33 by being stored in S2. The spring 33 is fixed to the

  Then, in a state where the valve body 22 is placed on the small diameter portion 23B of the elevating member 23, the urging force of the spring 17 pushes the elevating member 23 upward, thereby forming the valve mechanism. 22 in the vertical direction of the upper hemisphere of the upper hemisphere, for example, the outer periphery CF in the lateral direction at the position of 1/2 ("circumference of the plane cut in the horizontal direction"; ) Is applied by the biasing force of the spring 17 to the top (the top in the direction of projection into the second space S2) of the plurality of ridges 16T projecting on the inner side surface 16E1 of the second side wall 16E. It will be pressed and it will be in point contact.

  Further, in the present embodiment, the valve portion VA is provided on the top portion of the plurality of ridges 16T in which the lateral periphery CF of the valve body 22 described above protrudes to the inner side surface 16E1 of the second side wall 16E. A portion CF1 of the outer periphery in the lateral direction which does not make point contact in the lateral direction of the valve body 22 between portions which press and make point contact, a center CO of the valve body 22 and an outer periphery CF in the lateral direction The first air passage 15 is obtained by cutting the inner side surface 16E1 forming the first air passage 15 and the convex portions 16T on both sides of the inner side surface 16E1 with the surface CS (for example, a conical surface) extended outward. And a first communication port RA which is a cut end of the

  The valve unit may be one or more, and the same applies to the other embodiments. More specifically, the surface of the above-mentioned surface CS extended outward is a surface formed by extending outward in the radial direction or extending in the diagonally upward direction.

  In the valve portion VA, a portion of the lateral periphery CF of the valve body 22 in point contact with the top portions of the plurality of convex portions 16T of the second side wall 16E and the second side wall 16E An area which has not been formed will be formed. Therefore, as described above, the valve portion VA having a very small area formed by the portion CF1 of the outer periphery in the lateral direction not in point contact and the first communication port RA is formed.

  And the said cylinder main body 16 is provided with the large diameter part of the lower part and the small diameter part which the outer shape of the upper part exhibits a truncated cone shape, and passes through the center of the upper horizontal wall 16F which exhibits a circular shape in a plan view in this embodiment. As shown in FIG. 9 which is a longitudinal cross-section, in the present embodiment, it is preferable that the angle formed by the upward extension lines of the crests of the opposing convex portions 16T intersect is 60 degrees (50 degrees or more and 70 degrees or less). And). Thus, as described above, at the 1⁄2 position in the vertical direction of the upper hemisphere of the valve body 22, the lateral outer periphery CF of the valve body 22 is in point contact with the tops of the plurality of ridges 16T. It will be done.

In addition, the angle which the extension line to the upper part of the said convex part 16T which mutually opposes intersects is the same in the height of the said convex part 16T in all the positions. In addition, the shape of the second space S2 has a trapezoidal shape when viewed in a vertical section through the center of the upper horizontal wall 16F, and the angle at which the extension lines upward of the oblique side of the trapezoid also meet the present embodiment Although it is 60 degrees in form, it is not limited to this, and preferably not less than 50 degrees and not more than 70 degrees, and the second space S2 may have a truncated cone shape.

  Here, as described in detail with reference to FIGS. 8 to 11, the outer diameter of the large diameter portion 23A of the elevating member 23 is slightly smaller than the diameter of the first space S1 formed by the first side wall 16C of the cylinder main body 16. The lifting member 23 is movable up and down in the first space S1. Further, the elevating member 23 is raised by the biasing force of the spring 17, and the outer periphery CF of the valve body 22 in the lateral direction is pressed so as to make point contact with the top of the plurality of ridges 16T. The step wall 23E between the large diameter portion 23A and the small diameter portion 23B of the elevating member 23 and the side wall 23F of the small diameter portion 23B do not contact the lower horizontal wall 16D and the second side wall 16E of the cylinder main body 16 , With a slight gap.

  A gap 35 is formed between the inner surface of the first side wall 16C of the cylinder main body 16 and the outer surface of the side wall 23G of the large diameter portion 23A of the elevating member 23, and the surface of the side wall 23G is formed. An outwardly protruding convex portion 23T is formed extending in the vertical direction, and a gap is also formed between the convex portion 23T and the inner surface of the first side wall 16C. Therefore, even when the first side wall 16C and the convex portion 23T come into contact with each other when the elevating member 23 moves up and down, the contact area is small, and the elevating member 23 can move up and down smoothly. A plurality of cutouts 23H are formed at a lower end of the side wall 23G at a predetermined interval.

  Therefore, the elevating member 23 and the valve body 22 are raised by the biasing force of the spring 17, and the outer periphery CF of the valve body 22 in the lateral direction is in point contact with the tops of the plurality of ridges 16T. In the state of the atmospheric pressure or the positive pressure until the pressure in the fuel tank 100 reaches 5 kPa or more described later, the first passage resistance set by the size of the area of the valve portion VA (the valve portion VA The point contact is not released because the fluid (the resistance when passing the vaporized gas or the fuel) is large. Therefore, even if the first space S1 communicates with the opening S3 via the first air passage 15, the valve portion VA is closed, so that the valve portion VA is located above and below the valve portion VA. There is no transfer of said fluid between.

  That is, even if the inside of the cylinder main body 16 communicates with the outside air, if the pressure in the fuel tank 100, that is, the pressure below the valve portion VA is less than a predetermined value (for example, 5 kPa in setting value), The interior of the cylinder main body 16 below the valve portion VA is shut off from the outside air by the first passage resistance, the valve portion VA is closed, and the flow of the fluid between the upper and lower portions of the valve portion VA There is no

  In the embodiment of (1-1), 5 kPa is the total weight of the first passage resistance set by the size of the area of the valve portion VA, the total weight of the valve body 22 and the elevating member 23 The pressure value is set according to the magnitude of the biasing force of the spring 17.

  Then, when the fuel in the fuel tank 100 evaporates with the rise of the outside air temperature, the pressure in the filler cap 10 rises and the pressure flowing from the lower surface opening of the cylinder main body 16 is also the internal pressure of the fuel tank 100 As described above, the inside of the cylinder main body 16 is shut off from the open air by the valve portion VA, and the pressure flowing into the cylinder main body 16 from the lower surface opening of its own is The inside of the cylinder main body 16 and the inside of the fuel tank 100 have the same pressure without being discharged to the outside.

As described above, the first passage resistance can be set according to the size of the area of the valve portion VA, and the opening pressure of the valve portion VA can be set according to the combination with the magnitude of the biasing force of the spring 17. In the present embodiment, the opening pressure as described above, for example, set to 5 kPa, the area of the valve portion VA is extremely small, for example, 0.002mm and ^more ～0.02Mm ² or less, the first flow resistance Is set large, and the area of the valve portion VB etc., which will be described later, is also extremely small and has the same size.

  Further, if the biasing force of the spring 17 is too large, the lifting member 23 and the valve body 22 can not be lowered unless the negative pressure in the fuel tank 100 is too large. The total weight of the elevating member 23 and the valve body 22 is 1.0 times or more, for example, 1.1 to 2.0 times the total weight of the elevating member 23 and the valve body 22. It is sufficient if there is a small biasing force to push up and make the lateral circumference CF of the valve body 22 lightly press the point of the plurality of ridges 16T formed on the second side wall 16E into point contact .

  That is, in the case of a naturally falling engine, as described above, the biasing force of the spring 17 is, for example, about 1.1 times the total weight of the elevating member 23 and the valve body 22, and the fuel supply pump In the expression engine, for example, it is about 2.0 times.

  Then, the temperature of the outside air rises, and the fuel generated in the fuel tank 100 is vaporized and generated (Volatile Organic Compounds Gas, abbreviated as “VOC gas”) or the inside of the fuel tank 100 is full of the fuel. If the fluid pressure of the fuel expanded in a tan state or a state close thereto is, for example, less than 5 kPa, the VOC gas or the fuel may flow through the opening 33B of the spring 33 and the cylinder main body 16 and the elevating member When it flows into the gap 35 with 23, it also flows into the elevating member 23 to increase the pressure in the elevating member 23 and, together with the biasing force of the spring 17, the elevating member 23 And pushing up the valve body 22, the valve portion VA is closed, and the first passage resistance set by the size of the area of the valve portion VA is Ri said VOC gas or the fuel in said first space S1 is the fuel tank 100 external through the second space S2 and the opening S3, i.e. does not flow to the outside of the filler cap 10.

  However, the inside of the cylinder main body 16 communicates with the outside air via the opening S3, that is, the first communication port RA constituting the valve portion VA, and the space in the cylinder main body 16 is in a closed state. Instead, the VOC gas or the inside of the fuel tank 100, which has flowed into the second space S2 through the gap 35 between the cylinder main body 16 and the elevating member 23, is full of the fuel or is close thereto. If the fluid pressure of the fuel expanded in step (d) reaches a fluid pressure that can pass through the valve portion VA, for example, the pressure reaches 5 kPa, the VOC gas or the fuel that has flowed into the second space S2 below the valve portion VA. Is discharged to the outside of the filler cap 10 through the opening S3 while rising in the first air passage 15, and the valve body 22 resists the biasing force of the spring 17 by the pressure at the time of the discharge. Fine the lifting member 23 is lowered, opening the valve unit VA.

  Therefore, when the filler cap 10 is attached to the fuel tank 100, the pressure in the fuel tank 100 is increased, for example, to reach 5 kPa, whereby the elevating member 23 and the valve body 22 are lowered. The pressure in the fuel tank 100 is not released to the outside of the fuel tank 100.

  In the present embodiment, the outer lid 12, the inner lid 13, and the elevating member 23 are nylon, which is a synthetic resin material having a solvent resistance to fuel, which is a solvent such as gasoline, light oil, ethanol, or methanol. It is made of 6 or nylon 66.

  Then, as described above, when the cap body 14 is attached to the fuel inlet 98 of the fuel tank 100 by the spring 33, the ring-shaped gasket 36 abuts on the fuel inlet 98, whereby the fuel inlet 98 is closed by the cap body 14 (see FIG. 8).

  In FIG. 4, the filter 38 is a porous filter such as an activated carbon filter excellent in oil resistance or a filter made of a urethane synthetic resin, and the air is filtered to collect foreign matters such as dust in the air. And prevent the fuel from entering the fuel tank 100. The inner lid 13 is housed in the outer lid 12 in a state where the filter 38 is housed in the space 13S around the cylinder main body 16 of the inner lid 13, and the outer lid 12 and the inner lid 13 are accommodated. And fix. That is, the cylinder main body 16 is inserted into the hollow portion 38A opened at the central portion of the filter 38, and the filter 38 is accommodated in the space 13S in the inner lid 13 and the outer lid 12 and the inner lid 13 are fixed.

  In this case, a ring-shaped convex portion 39 is double-projected on the upper wall 13B of the peripheral portion of the inner lid 13 and the inner lid 13 is accommodated in the outer lid 12 from the convex portion 39 side, On the other hand, two welding ribs 12D are provided on the back surface side of the upper wall 12B of the outer lid 12 at predetermined intervals, and the welding ribs 12D and the projections 39 are welded and fixed by ultrasonic waves.

  Further, when the inner lid 13 is housed in the outer lid 12, a gap 40 is formed between the inner surface of the side wall 12C of the outer lid 12 and the outer surface of the side wall 13C of the inner lid 13. (See FIGS. 8 and 12). The lower end of the gap 40 is open and serves as a vent communicating with the atmosphere outside the filler cap 10 (outside the automobile 101).

  And in FIG.5 and FIG.6, although the several groove | channel 41 is formed in each said convex part 39 of the upper surface of the said inner lid 13 at predetermined intervals, the some said provided in the said outer lid 12 The welding rib 12D is not provided at a position opposite to the groove 41 provided in each convex portion 39 of the inner lid 13 (with an interval IN). Thereby, when the outer lid 12 and the inner lid 13 are welded and fixed by ultrasonic waves, the grooves 41 provided in the respective convex portions 39 are not blocked by the welding rib 12D. It is configured.

  Accordingly, an air passage 43 is formed between the outer lid 12 and the inner lid 13 so that outside air can be introduced into the fuel tank 100 through the filler cap 10. In addition, the filter 38 and the outer lid 12 are generated only when the pressure in the fuel tank 100 is increased by the generated VOC gas or the expanded fuel and the pressure to lower the elevating member 23 and the valve body 22 is reached. The pressure that has risen to the outside of the fuel tank 100 can be released through the space 44 with the back surface, the air passage 43 and the gap 40.

  Note that at a pressure that does not lead to lowering the elevating member 23 and the valve body 22, the lateral periphery CF of the valve body 22 makes point contact with the tops of the plurality of ridges 16 T, and the valve The portion VA is closed, and the VOC gas or the fuel in the first space S1 is sealed by the first passage resistance via the second space S2 and the opening S3. Not released outside.

  Therefore, the valve mechanism portion is constituted by the cylinder main body 16, the elevating member 23, the spring 17, and the valve body 22, and functions as a safety valve.

  Next, assembly of the filler cap 10 will be described with the above configuration. The inner lid 13 is accommodated in the outer lid 12 in a state where the cylinder main body 16 of the inner lid 13 is inserted into the hollow portion 38A of the filter 38, and each of the outer lid 12 is also inserted. The welding rib 12D and the respective projections 39 of the inner lid 13 are welded and fixed by ultrasonic waves, and the inner lid 13 and the outer lid 12 are fixed.

  First, in a state where the valve body 22 is placed on the elevating member 23, for example, the elevating member 23 is accommodated in the space of the cylinder main body 16. Then, the small diameter portion 23B of the elevating member 23 enters the second space S2 with the valve body 22 mounted, and the large diameter portion 23A enters the first space S1. .

  Next, the spring 17 is accommodated in the space 23S of the elevating member 23, and the rivet 34 is inserted into the fixing hole 13G of the bottom wall 13A of the inner lid 13 and the fixing hole 33A of the spring 33. As a result, the spring 33 is fixed to the bottom wall 13A.

  Thereby, the assembly of the filler cap 10 provided with the valve mechanism is completed. And the said filler cap 10 assembled in this way is attached to the said filler 98, and will be utilized.

  In this state, the spring 17 pushes up the valve body 22 and the elevating member 23 by its biasing force, and the lateral outer periphery CF of the valve body 22 is a plurality of the second side walls 16E of the cylinder main body 16 It makes point contact with the top of the ridges 16T of the strip. At this time, since the first passage resistance set to the valve portion VA is large, the valve portion VA is closed, and the point contact is not released by the first passage resistance, and the valve portion VA is configured. The fluid does not move between the first space S1 and the opening S3 via the first communication port RA.

  Next, the operation of the filler cap 10 when the fuel tank 100 is in a substantially horizontal state will be described. First, immediately after the fuel is put into the fuel tank 100 and the filler cap 10 is attached to the filler port 98, the pressure inside and outside the fuel tank 100 is equal. Accordingly, the spring 17 pushes up the valve body 22 and the elevating member 23, and the lateral outer periphery CF of the valve body 22 makes point contact with the plurality of convex portions 16T of the second side wall 16E. The valve portion VA is closed, the point contact is not released due to the first passage resistance, and the fluid does not move between the first space S1 and the opening S3, and the inside of the fuel tank 100 is closed. And the outside are shut off.

  That is, outside air outside the filler cap 10 through the gap 40, the air passage 43, the space 44, the space 12S, and the opening S3, the lateral periphery CF of the valve body 22 is the second side wall. The valve portion VA is closed because the first passage resistance is large in point contact with the plurality of ridges 16T of 16E, and the first space is opened via the opening S3 and the second space S2. Inflow into the space S1 is blocked.

  Further, the VOC gas or the fuel in the fuel tank 100 through the opening 33B of the spring 33, the first space S1 of the cylinder main body 16, the gap 35 between the cylinder main body 16 and the elevating member 23 Since the first passage resistance is large, the valve portion VA is closed, and the valve is not discharged to the outside of the fuel tank 100, that is, the outside of the filler cap 10 through the opening S3 by the first passage resistance.

  Next, when the outside air temperature rises while the engine 99 is stopped, the fuel in the fuel tank 100 evaporates to generate harmful VOC gas, or the fuel tank 100 is full of fuel. The fuel expands under or near a state, and the internal pressure in the fuel tank 100 increases. However, if the internal pressure in the fuel tank 100 is, for example, less than 5 kPa, the lateral periphery CF of the valve body 22 is pressed against the top of the convex portion 16T by the biasing force of the spring 17 In contact, the valve portion VA is closed, and the VOC gas or the fuel in the first space S1 is closed by the first passage resistance via the second space S2 and the opening S3 to the outside of the fuel tank 100, That is, the filler cap 10 is not discharged to the outside.

  Therefore, even if the fuel in the fuel tank 100 is evaporated to generate the VOC gas or the fuel is expanded, the VOC gas or the fuel is released to the outside of the automobile 101 as described above. Being suppressed. For this reason, since the harmful VOC gas evaporated from the fuel or the fuel is not released to the outside of the automobile 101, environmental pollution can be prevented.

  Then, while the engine 99 is stopped, the generation amount of the VOC gas due to evaporation of the fuel in the fuel tank 100 further increases with the further increase of the outside air temperature, or the inside of the fuel tank 100 When the fuel expands under or near the full state of the fuel and the pressure in the fuel tank 100 further increases and reaches, for example, 5 kPa, the space between the convex portions 16T of the second side wall 16E The high pressure VOC gas or expanded fuel in the first air passage 15 formed in the first air passage 15 rises against the first passage resistance set by the size of the area of the valve portion VA, The lateral outer periphery CF of the valve body 22 passes through the valve portion VA in point contact with the convex portion 16T. For this reason, the VOC gas or the fuel rising through the valve portion VA acts to push the valve body 22 downward from diagonally above.

  Therefore, the valve body 22 and the elevating member 23 are lowered by the VOC gas or the fuel against the biasing force of the spring 17 to open the valve portion VA (see FIG. 10).

  Therefore, when the pressure in the fuel tank 100 reaches 5 kPa and the valve portion VA is opened as described above, the excessive pressure in the fuel tank 100 (including the VOC gas and the fuel). The opening 33B, the first space S1 (the gap 35), the second space S2 (including the first air passage 15), the opening S3, the space 12S, the space 44, and the air passage 43. The air is discharged to the outside of the filler cap 10, that is, the outside of the automobile 101 through the gap 40.

  Then, the pressure inside the fuel tank 100 immediately becomes less than 5 kPa due to the discharge, and the valve part VA is closed, as shown in FIG. 8 and FIG. 9, the valve mechanism part Has a function as a safety valve. That is, as described above, the lifting member 23 and the valve body 22 are raised by the biasing force of the spring 17, and the lateral periphery CF of the valve body 22 is the top of the plurality of convex portions 16T. At the same time, the valve portion VA is closed, and the valve mechanism portion has a function as a safety valve, which can improve the fuel consumption and prevent environmental pollution.

  As described above, when the pressure in the fuel tank 100 rises to the set pressure value, the VOC gas or the fuel in the first space S1 passes through the second space S2 and the opening S3. The reason why the fuel tank 100 is discharged to the outside of the fuel tank 100, that is, the outside of the fuel filler cap 10 is not determined by the pressure in the fuel tank 100 when the fuel filler cap 10 is removed from the automobile 101. This is because fuel is scattered outside the automobile 101 and is dangerous, and the valve mechanism functions as a safety valve.

  Next, the engine 99 of the automobile 101 is in a state where the lateral outer periphery CF of the valve body 22 is in point contact with the tops of the plurality of ridges 16T and the valve portion VA is closed. Hereinafter, the case where the pressure in the fuel tank 100 becomes a negative pressure due to the consumption of the fuel by the driving of the motor will be described.

  When the inside of the fuel tank 100 changes to a negative pressure due to the consumption of the fuel, the inside of the raising and lowering member 23 also becomes a negative pressure through the opening 33B of the spring 33, and the raising and lowering member resists the biasing force of the spring 17. Since 23 is lowered, the valve body 22 is also lowered and the valve portion VA is opened.

  Then, the atmosphere moves between the opening S3 and the first space S1, and the atmosphere flows through the gap 40, the air passage 43, the space 44, the space 12S, the opening S3, the second space S2 (including the first air passage 15), the first space S1 (the gap 35), and the opening 33B flow into the fuel tank 100 to supply the fuel to the engine 99. Do.

  Therefore, when the inside of the fuel tank 100 that has flowed in is at atmospheric pressure, the valve body 22 and the elevating member 23 are raised by the biasing force of the spring 17, and the valve portion VA is closed to open the opening S3, The inflow of the atmosphere to the first space S1 disappears through the second space S2, and when the fuel is consumed again when the negative pressure state occurs, the inflow is repeated, and the same operation is repeated thereafter. The operation in the case where the pressure in the fuel tank 100 becomes negative due to the consumption of the fuel by the driving of the engine 99 in the state where the valve portion VA is closed as described above will be described below. The same applies to all the embodiments relating to the filler cap 10 and the valve mechanism 60.

  The method or structure for attaching the filler cap 10 (the cap main body 14) to the filler opening 98 is not limited to the spring 33 made of a flat spring, and may be a screw type. The screw type embodiment described above will be described below.

  First, as shown in FIG. 12, a hollow outer cylindrical portion 13D as an attachment member is formed under the inner lid 13 and a female screw portion is formed on the inner side surface of the outer cylindrical portion 13D having a space as a communication passage. The filler cap 10 (the cap main body 14) is attached to the filler opening 98 by forming 13 E and screwing with an external thread formed in the filler opening 98.

  Then, an inner cylindrical portion 13F is formed inward of the outer cylindrical portion 13D, and is formed at the peripheral portion of the cap 18 so that the elevating member 23 accommodated in the first space S1 does not fall. The inner cylindrical portion 13F is fitted in the fitting groove 18A. Thus, the cap 18 fixed to the inner lid 13 supports the spring 17 supporting the elevating member 23, and as a result, the elevating member 23 is supported so as not to drop.

  An air passage 18S communicating with the first space S1 is formed at a central portion of the cap 18, and a lower portion of the air passage 18S communicates with the inside of the fuel tank 100. That is, although the lid 19 for preventing the wave of the fluid is provided in the groove 18B opened on the lower surface of the cap 18, a part of the lower surface opening of the groove 18B communicates with the inside of the fuel tank 100 (fluid A fluid passage 20B which is closed by the cover 19 except for the suction / discharge port 20A and which communicates with the fluid suction / discharge port 20A and the air passage 18S are formed above the cover 19.

  Reference numeral 21 denotes a gasket whose central portion is open. When the inner cylindrical portion 13F is fitted in the fitting groove 18A of the cap 18, the outer diameter of the cap 18 is equal to the inner diameter of the opening of the gasket 21. Because of the large diameter, the folded back piece 18C of the cap 18 prevents the detachment. Then, when attaching the filler cap 10 to the filler opening 98, the male screw part formed in the filler opening 98 is screwed to the female screw part 13E formed in the inner wall surface of the outer cylindrical portion 13D. The base of the filler port 98 abuts against the gasket 21 and is sealed.

(1-2) Second embodiment of the cylinder main body 16 (the valve portion VB, see FIGS. 13 and 14)
Next, a second embodiment of the cylinder main body 16 will be described based on FIG. 13 and FIG. 14, but it can be applied to all the embodiments to be described later. In the first embodiment of the cylinder main body 16, several ridges 16 T extending in the vertical direction are projected on the inner side surface 16 E 1 of the second side wall 16 E, and the first air passage is formed between the ridges 16 T It was a form which forms 15.

  However, in the second embodiment, a plurality of second air passages 15A communicating with the opening S3 and the second space S2 are formed in the second side wall 16E of the cylinder main body 16. More specifically, the inner side surface 16E1 (the inner side surface forming the second space S2) of the second side wall 16E extends in the vertical direction with a predetermined interval, and the transverse plane has, for example, a triangular shape. The second air passage 15A is formed by forming a plurality of (for example, eight) grooves (for example, eight grooves) in a concave portion (outwardly forming a recess). That is, on the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16, the second air passage 15A which is the concave portion and the inner side surface 16E1 of the second side wall 16E on which the valve body 22 contacts It will be formed alternately.

  As described above, the shape of the space S2 has a trapezoidal shape when taken longitudinally through the center of the upper horizontal wall 16F, and the angle at which the extension lines upward of the oblique side of the trapezoid intersect For example, although it is 60 degrees, since the depth of the recess forming the second air passage 15A is also the same depth over the entire area, as shown in FIG. The angle formed by the extension lines is also 60 degrees, but is not limited to this, and preferably not less than 50 degrees and not more than 70 degrees, and the space S2 may have a frusto-conical shape.

  Further, in the valve portion VB in the second embodiment, the above-mentioned lateral periphery CF of the valve body 22 is pressed against the inner side surface 16E1 of the second side wall 16E so as to be in line contact with the portion The surface CS (for example, a conical surface) formed by connecting the portion CF2 of the lateral periphery where the valve body 22 does not contact with the line, the center CO of the valve member 22 and the lateral periphery CF of the lateral portion A second communication port RB, which is a cut portion of the second air passage 15A, is formed by cutting the surface for forming the concave portion forming the second air passage 15A with the surface extended to the second air passage 15A. Therefore, as described above, the valve portion VB having a very small area constituted by the portion CF2 of the outer periphery in the lateral direction not in line contact and the second communication port RB is formed.

  As described above, by configuring, the operation of the second embodiment of the cylinder main body 16 is also the same as that of the first embodiment, and in particular, only different operations will be described. If the fuel tank 100 is substantially horizontal and the internal pressure in the fuel tank 100 is increased while the engine 99 is stopped, for example, if it is less than 5 kPa, the lateral direction of the valve body 22 The outer periphery CF is pressed into line contact with the inner side surface 16E1 of the second side wall 16E by the urging force of the spring 17, the valve portion VB is closed, and the area is set according to the size of the valve portion VB The VOC gas or the fuel in the first space S1 is discharged from the fuel tank 100 through the second space S2 and the opening S3 according to a second passage resistance (a resistance when the fluid passes through the valve portion VB). It is not discharged outside, that is, to the outside of the filler cap 10.

  5 kPa in the embodiment (1-2) is the spring 17 having the total weight of the second passage resistance set by the size of the area of the valve portion VB, the valve body 22 and the elevating member 23. It is a pressure value set by the magnitude of the biasing force of.

  Therefore, even if the fuel in the fuel tank 100 is evaporated to generate the VOC gas or the fuel is expanded, the VOC gas or the fuel is released to the outside of the automobile 101 as described above. Being suppressed. For this reason, since the harmful VOC gas evaporated from the fuel or the fuel is not released to the outside of the automobile 101, environmental pollution can be prevented.

  Similarly, when the pressure in the fuel tank 100 reaches 5 kPa, for example, while the engine 99 is stopped, the high pressure VOC gas or expanded fuel in the second air passage 15A of the second side wall 16E is expanded. Rises against the resistance of the second passage, and the outer periphery CF of the valve body 22 in the lateral direction passes through the valve portion VB in linear contact with the inner side surface 16E1 of the second side wall 16E. Therefore, the rising VOC gas or the fuel acts to push down the valve body 22 downward, and the valve body 22 and the elevating member 23 are lowered against the urging force of the spring 17, Open the valve part VB. Then, the excessive pressure (including the VOC gas and the fuel) in the fuel tank 100 is determined by the opening 33B, the first space S1 (the gap 35), and the second space S2 (the second air passage). 15A, the opening S3, the space 12S, the space 44, the air passage 43, and the gap 40, the fuel is discharged to the outside of the automobile 101 through the filler cap 10.

  Then, the pressure inside the fuel tank 100 immediately becomes less than 5 kPa due to this discharge, the valve part VB is closed, the valve mechanism part has a function as a safety valve, and the fuel consumption is improved. At the same time, environmental pollution can be prevented.

  The operation when the inside of the fuel tank 100 is changed to a negative pressure due to the consumption of the fuel is the same as the operation of the first embodiment of the cylinder main body 16 described above, and the description is omitted here.

  In the first and second embodiments of the cylinder main body 16, even if the fuel tank 100 is inclined when the opening pressure of the valve portion VA or VB is set to 5 kPa, for example, If the pressure in the fuel tank 100 is less than 5 kPa, the valve portion VA or VB will not open.

  Also, when the fuel tank 100 is inclined, when the VOC gas or fuel having an open pressure set to the valve portion VA or VB, for example, a pressure of 5 kPa or more flows into the cylinder main body 16, the cylinder main body The valve body 22 described in the first embodiment of the present invention 16 is in point contact with the apexes of the plurality of ridges 16T projecting on the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16 From the state, or from the state where the valve body 22 described in the first embodiment is in line contact with the inner side surface 16E1 of the second side wall 16E, the valve body 22 is moved downward by the downward stroke of the elevating member 23. When it falls, the VOC gas and the fuel in the fuel tank 100 are discharged to the outside of the automobile 101 through the filler cap 10.

  In this case, in the second space S2 of the inclined cylinder main body 16, the valve body 22 moves onto the inner side surface 16E1 located below the cylinder main body 16, and the vertical direction of the second space S2 is obtained. It will be away from the central axis.

  Therefore, in order to minimize the distance of the valve body 22 from the central axis of the second space S2 in the longitudinal direction, a distance of, for example, 0.1 mm or more and 0.4 mm or less from the spherical valve body 22 Guide ribs or enclosures (both not shown) provided at (spaced) intervals are provided inwardly on the inner side surface 16E1 of the second side wall 16E. The rib or the enclosure extends downward such that the inner end thereof is parallel to the vertical center line of the second space S2 having a truncated cone shape at a position below the valve portion VA or VB. It is formed.

  Thereby, when the valve body 22 is moved up and down while being guided along the rib or the inner end of the enclosure due to the presence of the distance (the interval), the valve portion VA is easily moved, and the valve portion VA Or stabilize the switching operation of VB. The vertical movement strokes of the valve body 22 and the elevating member 23 are set to half or less of the diameter of the valve body 22.

(2) Second embodiment of the valve body 22 and the elevating member 23 (valve portion VC, see FIG. 7 (D), FIG. 15 and FIG. 16)
Next, a second embodiment of the valve body 22 and the elevating member 23 will be described based on FIG. 7 (D), FIG. 15 and FIG. 16, but the first embodiment corresponds to the valve body 22 and While the elevating member 23 is configured separately, the second embodiment is configured integrally and will be described below.

  The second embodiment of the valve body 22 and the raising and lowering member 23 will be described by applying to the cylinder main body 16 forming the first air passage 15 shown in FIGS. 7, 9 and 10 in particular. The present invention may be applied to the cylinder main body 16 forming the second air passage 15A shown in FIG. 13 and FIG. 14, and the other configuration is the same. However, when the second air passage 15A as shown in FIG. 13 and FIG. 14 is formed in the cylinder main body 16, for example, 1/2 position in the vertical direction of the hemispherical portion 22A1 of the valve body 22A described later. The outer periphery CP in the horizontal direction ("the circumference of the plane cut in the horizontal direction" and hereinafter abbreviated as "the outer periphery CP of the hemispherical portion 22A1") forms the second air passage 15A. It will be in line contact with the inner side surface 16E1 of the second side wall 16E excluding the recess, and the following description will also be understood as the outer periphery CP in the lateral direction, and the second air passage 15A is taken as the cylinder main body The description of the embodiment in the case of forming 16 will be omitted.

  First, the elevating member 23 has a substantially bottomed hollow cylindrical shape, and is formed at the upper surface central portion of the upper large diameter portion 23A at the lower portion, the small diameter portion 23B at the upper portion, and the upper wall 23B1 of the small diameter portion 23B. It consists of the said valve body part 22A. The valve body portion 22A is composed of the semispherical portion 22A1 which is a generally semispherical portion of the upper portion and the cylindrical portion 22A2 of the lower portion, and when taken longitudinally, it becomes an upper semicircular portion and a lower rectangular portion (FIG. 15) reference).

  The stepped wall 23E between the large diameter portion 23A and the small diameter portion 23B of the elevating member 23 and the side wall 23F of the small diameter portion 23B are the lower horizontal wall 16D and the second side wall 16E of the cylinder main body 16. It has a slight gap without contacting it.

  The raising and lowering member 23 is raised by the biasing force of the spring 17 housed in the portion 23A, and the lateral outer circumference CP of the hemispherical portion 22A1 of the valve body portion 22A constituting the valve mechanism portion is the second The apexes of the plurality of ridges 16T protruding from the inner side surface 16E1 of the side wall 16E are pressed to point contact with the apexes (the apexes in the direction of projection into the second space S2).

  Specifically, in the case where the hemispherical portion 22A1 of the valve body portion 22A is entirely spherical, the lateral periphery CP at the position of, for example, 1/2 in the vertical direction of the upper hemisphere in the upper spherical direction is the above-mentioned second sidewall 16E. It will be in point contact with the tops of the plurality of ridges 16T that are projected to the inner side surface 16E1.

  Further, in the present embodiment, the valve portion VC is the top portion of the plurality of ridges 16T in which the lateral outer circumference CP of the valve body portion 22A is projected to the inner side surface 16E1 of the second side wall 16E. And the portion of the outer periphery CP of the valve body 22A in the lateral direction which does not make point contact with each other and the hemispherical portion 22A1 of the valve body 22A as a sphere. And a lateral surface CP (e.g., a conical surface) formed by connecting the outer circumferential surface CP in the lateral direction and extending outward, the first air passage 15 is formed by the inner side surface 16E1 and the inner side surface 16E1 on both sides. It is comprised by the 1st communicating port which is a cut end of said 1st air passage 15 which cut said convex part 16T.

  More specifically, the surface of the above-mentioned surface CU extended outward is a surface formed by extending outward in the radial direction or extending in a diagonally upward direction.

  By being configured in this manner, the operation is the same as the operation described in the first embodiment of the cylinder main body 16, and will be briefly described below. If the fuel tank 100 is substantially horizontal and the internal pressure of the fuel tank 100 is less than 5 kPa while the engine 99 is stopped, the valve body portion is urged by the biasing force of the spring 17. The valve portion VC is closed by point contact with the convex portion 16T in which the lateral outer circumference CP of the hemispherical portion 22A1 of 22A protrudes to the inner side surface 16E1 of the second side wall 16E, and the valve portion VC is closed According to the set first passage resistance (resistance when the fluid passes through the valve portion VC), the VOC gas or the fuel in the first space S1 is passed through the second space S2 and the opening S3. The fuel is not discharged to the outside of the fuel tank 100, that is, to the outside of the filler cap 10 (see FIG. 15).

  Similarly, when the pressure in the fuel tank 100 reaches 5 kPa, for example, while the engine 99 is stopped, the high pressure VOC gas or the expansion of the inside of the first air passage 15 of the second side wall 16E is performed. The fuel rises against the resistance of the first passage, and the lateral outer circumference CP of the hemispherical portion 22A1 of the valve body 22A is in point contact with the convex portion 16T of the second side wall 16E. It passes through the valve part VC. Therefore, the rising VOC gas or the fuel acts to push the lifting member 23 downward, and the lifting member 23 is lowered against the urging force of the spring 17 to open the valve portion VC. (See FIG. 16). Then, the excessive pressure (including the VOC gas and the fuel) in the fuel tank 100 is determined by the opening 33B, the first space S1 (the gap 35), and the second space S2 (the first air passage). 15), the opening S3, the space 12S, the space 44, the air passage 43, and the gap 40, that is, the gas is discharged to the outside of the automobile 101 through the filler cap 10. .

  Then, the pressure inside the fuel tank 100 immediately becomes less than 5 kPa due to this discharge, the valve part VC is closed, the valve mechanism part has a function as a safety valve, and the fuel consumption is improved. At the same time, environmental pollution can be prevented.

  When the valve body portion 22A is applied to the cylinder main body 16 forming the second air passage 15A shown in FIGS. 13 and 14, the valve portion is the valve body portion 22A of the elevating member 23. The lateral direction CP in which the valve body portion 22A does not make line contact between the portions where the lateral periphery CP of the hemispherical portion 22A1 presses against the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16 The surface CU (for example, a conical surface) formed by connecting the center CN when the hemispherical portion 22A1 of the valve body portion 22A is a sphere and the outer periphery CP in the lateral direction is a outward surface. It is comprised by the 2nd communication port which is a cut section of said 2nd air passage 15A which cut the field for forming said crevice which forms said 2nd air passage 15A by said field extended to it.

  In this case, the lateral outer circumference CP of the hemispherical portion 22A1 of the valve body 22A is pressed against the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16 by the biasing force of the spring 17 to make line contact. In the above state, when the pressure in the fuel tank 100 is increased by the VOC gas generated by evaporation of the fuel in the fuel tank 100 or the expanded fuel and reaches, for example, 5 kPa, the area of the valve portion The VOC gas or the fuel ascends through the second air passage 15A formed in the inner side surface 16E1 against the second passage resistance set by the size, passes through the valve portion, and ascends. The VOC gas or the fuel pushes down the elevating member 23 downward against the urging force of the spring 17 to lower it, and opens the valve unit. The excessive pressure in the fuel tank 100 first space S1, is discharged into the fuel tank 100 outside through the second space S2 and the opening S3.

  In the two embodiments using the valve body portion 22A described above, the operation when the inside of the fuel tank 100 is changed to a negative pressure due to the consumption of the fuel is formed in the cylinder main body 16 described above. The operation is the same as that of the embodiment of the valve 22 applied to the first air passage 15 and the second air passage 15A, and the description thereof is omitted here.

  Note that 5 kPa in the above embodiment (2) is the first passage resistance or the second passage resistance set by the size of the valve portion VC or the area of the valve portion, and the valve body portion 22A. The pressure value is set by the magnitude of the biasing force of the spring 17 which is greater than the weight of the elevating member 23 provided.

(3) Third embodiment of the valve body 22 and the elevating member 23 (valve portion VD, see FIG. 7 (E), FIG. 17 and FIG. 18)
Next, a third embodiment of the valve body 22 and the elevating member 23 will be described based on FIGS. 7E, 17 and 18, but the first embodiment of the valve body 22 and the elevating member 23 will be described. While the valve 22 and the elevating member 23 are separately provided in the embodiment of the present invention, this third embodiment is integrally configured as in the second embodiment, It will be described below. The third embodiment is described by applying to the cylinder main body 16 forming the first air passage 15 particularly shown in FIGS. 7, 9 and 10, but the second embodiment shown in FIGS. 13 and 14 will be described. The present invention may be applied to the cylinder main body 16 forming the air passage 15A, and the other configuration is the same.

  First, the elevating member 23 has a generally bottomed hollow cylindrical shape, and is formed on the upper surface central portion of the upper wall 23B1 of the small diameter portion 23B and the small diameter portion 23B of the upper portion. And a valve body 22B. The valve body portion 22B is composed of an upper truncated cone portion 22B1 and a lower cylindrical portion 22B2 and has a trapezoidal shape in the upper portion and a rectangular portion in the lower portion in a longitudinal cross section (see FIG. 17).

  The angles formed by the upward extension lines of the side surface BB1 of the truncated cone-like valve body portion 22B of the elevation member 23 are such that the extension lines of the top portions of the opposing convex portions 16T intersect with each other As well as the angle that can be, it is also 60 degrees.

Then, the elevating member 23 is raised by the biasing force of the spring 17 housed in the large diameter portion 23A, and the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B constituting the valve mechanism portion The apexes of the plurality of ridges 16T protruding from the inner side surface 16E1 of the second side wall 16E are pressed into line contact with the apexes (the apexes in the direction of projection into the second space S2). However, when the second air passage 15A as shown in FIGS. 13 and 14 is formed in the cylinder main body 16, the side surface 22BB1 of the truncated cone portion 22B1 of the valve body 22B is the second air passage. It will be in surface contact with the inner side surface 16E1 of the second side wall 16E excluding the concave portion forming the 15A, and the following description will be understood in this way, and the second air passage 15A is formed in the cylinder main body 16 The description of the embodiment in the case of having been performed will be omitted.

  And since the portion where the side surface 22BB1 of the truncated cone portion 22B1 contacts the apex of the plurality of ridges 16T is long, the length of the first air passage 15 of the contacting portion is also long, and the valve portion The range in which the first passage resistance can be set to VD can be expanded.

  Further, in the present embodiment, the valve portion VD is a portion of the plurality of convex portions 16T in which the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B protrudes to the inner side surface 16E1 of the second side wall 16E. The side surface 22BB1 which does not make a line contact in the lateral direction of the valve body 22B between the portions that make line contact with the top and the inner side surface 16E1 corresponding to the side surface 22BB1 which does not make this line contact It comprises with the 1st communicating port formed by 16T.

With this configuration, the operation is the same as that described in the first embodiment of the cylinder main body 16, and will be briefly described below. The fuel tank 100 is in a generally horizontal state, and the operation of the filler cap 10 will be described. During stop of the engine 99, even if the internal pressure in the fuel tank 100 is increased, if the pressure is less than 5 kPa, the biasing force of the spring 17 causes the side surface 22BB1 of the truncated cone portion 22B1 of the valve body 22B. The valve portion VD is closed in line contact with the top portions of the plurality of ridges 16T protruding from the inner side surface 16E1 of the second side wall 16E, and the first passage resistance set in the valve portion VD According to (the resistance when the fluid passes through the valve portion VD), the VOC gas or the fuel in the first space S1 is out of the fuel tank 100 through the second space S2 and the opening S3, that is, the fuel gas It is not discharged outside the filler cap 10 (see FIG. 17).

  Similarly, when the pressure in the fuel tank 100 reaches 5 kPa, for example, while the engine 99 is stopped, the high pressure VOC gas or the expansion of the inside of the first air passage 15 of the second side wall 16E is performed. The fuel rises against the first passage resistance, and the side surface 22BB1 of the frusto-conical portion 22B1 of the valve body 22B makes line contact with the tops of the plurality of convex portions 16T of the plurality of second side walls 16E. Pass through the valve part VD. Therefore, the rising high pressure VOC gas or the fuel acts to push the lift member 23 downward, and the lift member 23 is lowered against the biasing force of the spring 17, thereby the valve portion VD. Open (see FIG. 18). Then, the excessive pressure (including the VOC gas and the fuel) in the fuel tank 100 is determined by the opening 33B, the first space S1 (the gap 35), and the second space S2 (the first air passage). 15), the opening S3, the space 12S, the space 44, the air passage 43, and the gap 40, that is, the gas is discharged to the outside of the automobile 101 through the filler cap 10. .

  Then, the pressure inside the fuel tank 100 immediately becomes less than 5 kPa due to this discharge, the valve part VD is closed, the valve mechanism part has a function as a safety valve, and the fuel consumption is improved. At the same time, environmental pollution can be prevented.

When the valve body 22B is applied to the cylinder main body 16 forming the second air passage 15A shown in FIGS. 13 and 14, the side surface 22BB1 of the valve body 22B of the elevating member 23 The surface 22b1 does not contact the side 22BB1 which is not in surface contact between the portions of the second side wall 16E which are pressed against the inner surface 16E1 of the second side wall 16E except the concave portion forming the second air passage 15A of the cylinder main body 16 A valve portion is constituted by a second communication port formed of a surface for forming the recess in the inner side surface 16E1 corresponding to the side surface 22BB1.

  In this case, in a state where the side surface 22BB1 of the valve body portion 22B is in surface contact with the inner side surface 16E1 of the second side wall 16E excluding the recess forming the second air passage 15A of the cylinder main body 16, When the pressure in the fuel tank 100 is increased to 5 kPa by the VOC gas or the expanded fuel from which the fuel in the fuel tank 100 is evaporated, the pressure against the second passage resistance set in the valve unit is increased. The VOC gas or the fuel ascends in the second air passage 15A formed in the inner side surface 16E1 of the second side wall 16E, passes through the valve portion, and the rising VOC gas or the fuel as the ascent The pressure in the fuel tank 100 is reduced by depressing and lowering the lifting member 23 downward against the biasing force of the spring 17 and opening the valve portion. Serial first space S1, through the second space S2 and the opening S3, discharged into the fuel tank 100 outside.

  In the two embodiments using the valve body portion 22B described above, the operation when the fuel tank 100 is changed to a negative pressure due to the consumption of the fuel is formed in the cylinder main body 16 described above. The operation is the same as that of the embodiment applied to the first air passage 15 and the second air passage 15A, and the description is omitted here.

  In the above-described second and third embodiments of the valve body 22 and the elevating member 23, the plurality of ridges 16T are made to project on the inner side surface 16E1 of the second side wall 16E. Although the air passage 15 is formed or a plurality of recessed portions are formed to form the second air passage 15A, the present invention is not limited to this, and the second air passage 15A may be formed on the surface of the hemispherical portion 22A1 of the valve body 22A or A plurality of convex portions extending downward may be projected on the surface of the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B, or a plurality of concave portions may be formed to form an air passage. That is, the air passage may be formed in the valve body portion 22A or 22B.

  Further, in the above-described second and third embodiments of the valve body 22 and the elevating member 23, the valve body portions 22A and 22B are integrated with the elevating member 23, but as materials, it is possible to It is made of nylon 6 or nylon 66 which is a synthetic resin material having solvent resistance, and weight reduction can be achieved. Therefore, the biasing force of the spring 17 may be weaker than that of the stainless steel valve body 22.

The valve mechanism unit described in the above embodiment is configured to use the harmful VOC gas or the expanded fuel outside the fuel tank 100, that is, until the pressure in the fuel tank 100 reaches a pressure value above a certain level. The fuel can not be discharged to the outside of the filler cap 10, and the fuel consumption of the automobile 101 can be further improved, and environmental pollution can be prevented.

  Then, when the fuel pressure in the fuel tank 100 becomes negative due to the consumption of the fuel, the valve portion VD or the valve portion is opened to open the atmosphere to the opening S3 and the first air passage 15 or the second air passage 15A. The atmosphere is introduced into the fuel tank 100 by being introduced into the cylinder main body 16 via the cylinder main body 16, and the valve mechanism portion has a function of bringing the inside of the fuel tank 100 into the state of atmospheric pressure.

  Even if the fuel tank 100 is inclined, if the pressure in the fuel tank 100, in other words, the pressure below the valve portion VD or the valve portion is less than a set pressure value, for example, 5 kPa, 1) The first passage resistance or the second passage resistance set in the valve portion VD or the valve portion in the middle of the air passage 15 or the second air passage 15A is large, and the viscosity of the fuel is higher than that of the gas Also, the fuel can be prevented from leaking from the filler cap 10 to the outside.

  Note that 5 kPa in the above embodiment (3) is the first passage resistance set by the cross-sectional area and the length (volume) of the valve portion VD or the valve portion, and the valve body portion 22B. The pressure value is set by the magnitude of the biasing force of the biasing body 17 which is equal to or greater than the weight of the elevating member 23 provided with

(4) An embodiment in which the biasing force of the spring is less than 1.0 times the weight of the total of the elevating member 23 and the valve body 22 or the weight of the elevating member 23 including the valve body portion 22A or 22B. Form (refer to FIG. 1 to FIG. 18)
In all the embodiments shown in FIGS. 1 to 18 described above, the total weight of the elevating member 23 and the valve body 22 (see FIGS. 8 and 13), the valve body, and the biasing force of the spring 17. The weight of the elevating member 23 (see FIG. 15) including the portion 22A, or 1.0 times or more, for example, 1.1 or more of the weight of the elevating member 23 (see FIG. 17) including the valve body portion 22B. Although it is 2.0 times or less, the embodiment made less than 1.0 times, for example, 0.8 times or more and 0.93 times or less is described.

  In the embodiment of 0.8 times or more and 0.93 times or less, when the fuel tank 100 is in a substantially horizontal state, the elevating member 23 and the elevating member 23 are independent of the pressure value in the fuel tank 100. The elevating member 23 provided with the valve body 22, the valve body portion 22A, and the elevating member 23 provided with the valve body portion 22B are in a lowered state in a state where the spring 17 is compressed.

  Therefore, the valve body 22, the valve body portion 22A, and the valve body portion 22B do not contact the convex portion 16T or the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16, and the valve portion VA, VB, VC, VD, etc. (hereinafter referred to as "the valve portion VA etc.") are open.

  However, when the fuel tank 100 is inclined, the elevating member 23 and the valve body 22 including the valve body portion 22A according to the inclination angle until the inclination angle becomes 90 degrees. The weight applied to the spring 17 of the elevating member 23 provided with the valve body portion 22B of the member 23 is reduced, and the extension length of the spring 17 is increased. Eventually, when the spring 17 reaches a predetermined length, the valve body 22, the valve body portion 22A, and the valve body portion 22B are the convex portion 16T or the inner side surface of the second side wall 16E of the cylinder main body 16. It will contact 16E1.

  For this reason, when the fuel tank 100 is inclined, when the fuel flows into the gap 35 between the cylinder main body 16 and the elevating member 23 through the opening 33B of the spring 33, the elevation It also flows into the member 23 to increase the pressure in the elevating member 23, and together with the biasing force of the spring 17, the elevating member 23, the valve body 22 and the valve body portion 22A are provided. For example, 1/2 in the vertical direction of the upper hemisphere of the valve body 22 and the hemispherical portion 22A1 of the valve body portion 22A by pushing up the elevating member 23 provided with the elevating member 23 and the valve body portion 22B. The lateral perimeter CF, CP at the position is pressed against the top of the convex portion 16T to make point contact (or the lateral perimeter CF, CP makes line contact with the inner surface 16E1 of the second side wall 16E do it Or the side surface 22BB1 of the truncated cone portion 22B1 of the valve body portion 22B is pressed against and in line contact with the top portion of the convex portion 16T (or the second portion excluding the concave portion forming the second air passage 15A) The valve portion VA and the like are closed by being pressed by the inner side surface 16E1 of the side wall 16E, the valve portion VA and the like are closed, and the first passage resistance or the second passage resistance set in the valve portion VA The fuel in the one space S1 does not flow to the outside of the fuel tank 100, that is, the outside of the filler cap 10 through the second space S2 and the opening S3.

  As described above, in the inclined state of the fuel tank 100, the valve portion VA or the like is maintained in the closed state until the predetermined value, for example, 5 kPa is reached. It does not flow out.

  Therefore, the release of the fuel to the outside of the fuel tank 100 is suppressed, the valve mechanism portion has a function as a safety valve, and fuel consumption can be improved, and environmental pollution can be prevented.

  Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa in a state where the fuel tank 100 is inclined, the elevating member against the biasing force of the spring 17 23 and the valve body 22 are lowered to open the valve portion.

  When the fuel tank 100 returns to the horizontal state (including the “generally horizontal state”), the total weight of the elevating member 23 and the valve body 22 and the valve body portion 22A or 22B are provided. Due to the weight of the elevating member 23, they are lowered, and the valve portion VA and the like are opened regardless of the pressure value in the fuel tank 100.

  In addition, 5 kPa in the embodiment of the above (4) is the first passage resistance or the second passage resistance set by the size of the area of the valve portion VA or the like, the valve body 22 and the elevating member 23 And the magnitude of the biasing force of the spring 17 less than the total weight thereof.

(5) The filler cap 10 of the second embodiment (see FIGS. 19 to 22)
The following descriptions (5-1) and (5-2) are for the filler cap 10 using the valve part VA, but the filler cap 10 using the valve part VB is also used Applicable

(5-1) An embodiment in which the biasing force of the spring 17 is 1.0 times or more of the total weight of the elevating member 23 and the valve body 22 (see FIGS. 19 to 21).
Next, the fuel filler cap 10 according to another embodiment using parts different from the cylinder main body 16 shown in FIG. 7 and the parts housed in the inner lid 13 shown in FIGS. Description will be made based on 22. First, the lower end portion of the first side wall 16C of the cylinder main body 16 is formed with a step 16G with the bottom wall 13A of the inner lid 13 spreading outward. Therefore, a space S4 larger in diameter than the first space S1 and in communication with the first space S1 is formed in the bottom wall 13A of the inner lid 13.

  Reference numeral 50 denotes a blow-up member having a substantially hollow cylindrical shape, and the blow-up member 50 is loosely inserted in the spring 17 housed in the space 23S of the elevating member 23 (“inward of the spring 17 in the spring 17 Smaller diameter portion 50A to be inserted and disposed with a gap, the same applies hereinafter, and a stepped portion 50B larger in diameter than the small diameter portion 50A and supporting the lower portion of the spring 17 on the upper surface, A large diameter portion 50C which is larger in diameter than the stepped portion 50B and whose upper surface is in contact with the lower surface of the stepped portion 16G is provided. The step-up portion 50B connecting the small diameter portion 50A and the large diameter portion 50C forms a small diameter space 50S1 and a large diameter space 50S2 communicating with the lower portion of the small diameter space 50S1 in the blowup member 50.

  A first resistance member 51 includes a lower portion 51A having a circular shape in a plan view, and a cylindrical upper portion 51B erected at the center of the upper surface of the lower portion 51A. The lower portion 51A is stored (arranged) in the large diameter space 50S2 of the blowing member 50 in a state where the upper surface peripheral portion of the lower portion 51A of the first resistance member 51 is in contact with the lower surface of the step portion 50B. . At this time, the upper portion 51B is accommodated in the small diameter space 50S1 in a state of being separated from the inner side surface forming the small diameter space 50S1. Therefore, the cross-sectional area of the small-diameter space 50S1 becomes smaller in the state where the upper portion 51B is stored in the small-diameter space 50S1, and the passage resistance increases to increase the passage resistance in the small-diameter space 50S1. The pressure of the inflowing VOC gas or the fuel is reduced.

  The upper surface and the lower surface of the lower portion 51A of the first resistance member 51 are formed with circular grooves 51C and 51D having an outer diameter extending to a position where the outer diameter does not reach the peripheral end, and the groove 51C. And two communication ports 51E for communicating the communication port 51D with the communication port 51D. The communication port 51E has a small cross-sectional area and a large passage resistance, and increases the passage resistance through which the VOC gas or the fuel passes, thereby reducing the pressure of the VOC gas or the fuel flowing into the small diameter space 50S1. . The depth of the groove 51C is, for example, 0.2 mm, and the depth of the groove 51D is, for example, 0.3 mm.

  52 is a second resistance member having a circular shape in a plan view, and the large diameter space of the blowing member 50 with the upper surface peripheral portion of the lower portion 51A of the first resistance member 51 in contact with the lower surface of the step portion 50B. It is stored in 50S2. Grooves 52A and 52B having a circular shape in a plan view are formed on the upper surface and the lower surface of the second resistance member 52 and extend to a position where the outer diameter does not reach the peripheral end, and the grooves 52A and 52B Two communication ports 52C for communicating are formed. The communication port 52C has a small cross-sectional area and a large passage resistance, and the passage resistance through which the VOC gas or the fuel passes is increased to make the small diameter space 50S1 through the communication port 51E of the first resistance member 51. Reduce the pressure of the VOC gas or the fuel flowing into the The depth of the groove 52A is, for example, 0.2 mm, and the depth of the groove 52B is, for example, 0.3 mm. A passage resistance set by the cross-sectional area of the grooves 52A and 52B and the cross-sectional area and length of the communication port 52C is formed, and the pressure of the fluid passing therethrough can be reduced.

In particular, the fuel is more viscous than gas, and when the fuel tank 100 is inclined, the fuel from the fuel tank 100 is blown up through the communication port 51E of the first resistance member 51. When flowing into the small-diameter space 50S1, the passage resistance formed in the blowing-up member 50, the second resistance member 52, and the first resistance member 51 even if the pressure of the fuel is increased due to the increase of the outside air temperature. As a result, the pressure of the fuel can be reduced, the pressure applied to the valve portion VA (or the valve portion VB) becomes smaller, and the fuel filler cap 10 can be reduced via the valve portion VA (or the valve portion VB). It is possible to suppress the outflow of the fuel to the outside. In the embodiment of (5), the first resistance member 51 is used, but the second resistance member 52 may not necessarily be used.

  The valve mechanism section in the embodiment shown in FIGS. 19 to 22 includes the cylinder main body 16, the elevating member 23, the valve body 22, the spring 17, the blow-up member 50, and the first resistance member 51. And the second resistance member 52 and the like.

  With the above configuration, the assembly of the filler cap 10 according to another embodiment using a part different from the cylinder main body 16 and the parts housed in the inner lid 13 shown in FIG. 7 described above. Will be explained. The inner lid 13 is accommodated in the outer lid 12 in a state where the cylinder main body 16 of the inner lid 13 is inserted into the hollow portion 38A of the filter 38, and the inner lid 13 and the outer lid 12 And shall be fixed.

  First, in a state where the valve body 22 is placed on the elevating member 23, for example, the elevating member 23 is accommodated in the space of the cylinder main body 16. Then, the small diameter portion 23B of the elevating member 23 enters the second space S2 with the valve body 22 mounted, and the large diameter portion 23A enters the first space S1. .

  Next, the spring 17 is accommodated in the space 23S of the elevating member 23, and the second resistance while the lower portion 51A of the first resistance member 51 is accommodated in the large diameter space 50S2 of the blowing-up member 50. The upper surface of the member 52 is brought into contact with the lower surface of the large diameter portion 50C of the blow-up member 50 and the lower surface of the first resistance member 51, and the peripheral portion of the upper surface of the large diameter portion 50C is on the lower surface of the step 16G. The small diameter portion 50A of the blow-up member 50 is formed in the bottom wall 13A of the inner lid 13 so that the small diameter portion 50A of the blow-up member 50 is accommodated in the spring 17 accommodated in the space 23S of the elevating member 23 With the large diameter portion 50C and the second resistance member 52 housed in the space S4, the fixing hole 13G of the bottom wall 13A of the inner lid 13 and the fixing hole of the spring 33 are provided. By inserting the rivet 34 into a 3A, securing the spring 33 to the bottom wall 13A.

  Thereby, the assembly of the filler cap 10 provided with the valve mechanism is completed. And the said filler cap 10 assembled in this way is attached to the said filler 98, and will be utilized.

  Hereinafter, in the embodiment in which the biasing force of the spring 17 is 1.0 times or more, for example, 1.1 or more to 2.0 times or less of the total weight of the elevating member 23 and the valve body 22, the fuel filler opening The action of the cap 10 will be described.

  First, when the fuel tank 100 is substantially horizontal and the outside air temperature rises while the engine 99 is stopped, the internal pressure in the fuel tank 100 is increased even if the internal pressure in the fuel tank 100 is increased. For example, if it is less than 5 kPa, the outer periphery CF of the valve body 22 in the lateral direction is pressed against the top portion of the convex portion 16T by the biasing force of the spring 17 to make point contact (or the outer periphery CF of the lateral direction Is in line contact with the inner side surface 16E1 of the second side wall 16E, the valve portion VA (or the valve portion VB) is closed, and the first passage resistance set in the valve portion VA (or the valve The VOC gas or the fuel in the first space S1 is supplied to the outside of the fuel tank 100 through the second space S2 and the opening S3 by the second passage resistance set in the portion VB, that is, the supply Not released to the mouth cap 10 outside.

  In the embodiment of (5-1), 5 kPa is the first passage resistance or the second passage resistance set by the size of the area of the valve portion VA (or the valve portion VB), and the valve body 22 is a pressure value set by the magnitude of the biasing force of the spring 17 which is greater than the total weight of the lifting member 22 and the elevating member 23. In addition, 5 kPa in embodiment of (6-2) and (7-1) demonstrated below is a pressure value similar to (5-1).

  At this time, the communication port 52C in the second resistance member 52 and the communication port 51E are formed in the first resistance member 51, and the small diameter space 50S1 of the blowing-up member 50 is further formed in the second resistance member 52. Since the cylindrical upper portion 51B is present and the passage resistance is increased, the pressure of the VOC gas or the fuel flowing into the cylinder main body 16 is reduced, so that the fuel tank for the VOC gas or the fuel 100 Control external release.

  For this reason, since the harmful VOC gas evaporated from the fuel or the fuel is not released to the outside of the automobile 101, the valve mechanism portion has a function as a safety valve, and it is possible to improve the fuel consumption and the environment. Contamination can be prevented.

Then, similarly, while the engine 99 is stopped, the generation amount of the VOC gas further increases with the further increase of the outside air temperature, or the inside of the fuel tank 100 is full of the fuel or is near this. Under the conditions, when the fuel expands and the pressure in the fuel tank 100 is further increased, for example, to 5 kPa, the VOC gas from the fuel tank 100 or the fuel flows from the opening 33B to the second resistance. The groove 52B of the member 52, the communication port 52C and the groove 52A, the groove 51D of the first resistance member 51, the communication port 51E and the groove 51C, the large diameter space 50S2 of the blowing member 50 and the upper portion 51B The space 23S of the lifting member 23 is passed through the small-diameter space 50S1 around it. At this time, the pressure of the VOC gas or the fuel is decreased at the communication port 51E of the first resistance member 51, and the small diameter space 50S1 around the upper portion 51B by the upper portion 51B of the first resistance member 51 is The pressure of the passing VOC gas or the fuel is also decreased to accelerate the flow velocity, and the fuel or the VOC gas is spouted into the space 23S of the elevating member 23. For this reason, the VOC gas or the fuel is a gap between the lower portion of the side wall of the large diameter portion 23A of the lift member 23 and the large diameter portion 50C of the blowing member 50, the first space S1 (the gap 35), The oil supply via the second space S2 (including the first air passage 15 or the second air passage 15A ), the opening S3, the space 12S, the space 44, the air passage 43, and the gap 40. It will be discharged to the outside of the automobile 101 through the mouth cap 10.

  That is, in the first air passage 15 formed between the convex portions 16T of the second side wall 16E (in the second air passage 15A formed in the inner side surface 16E1 of the second side wall 16E), high pressure The VOC gas or the expanded fuel rises against the first passage resistance set in the valve portion VA (or the second passage resistance set in the valve portion VB), and the valve portion VA (Or the valve part VB). For this reason, the VOC gas or the fuel rising through the valve portion VA (or the valve portion VB) acts to push the valve body 22 downward from diagonally above.

  Accordingly, the lower portion of the side wall of the large diameter portion 23A of the elevating member 23 abuts on the upper surface of the large diameter portion 50C of the blowing member 50 against the biasing force of the spring 17 by the VOC gas or the fuel. The valve body 22 and the elevating member 23 are lowered until the valve portion VA (or the valve portion VB) is opened (see FIG. 21).

  Therefore, when the pressure in the fuel tank 100 becomes 5 kPa or more, and the valve portion VA (or the valve portion VB) is opened as described above, the excessive pressure in the fuel tank 100 (the VOC The gas and the fuel are released to the outside of the filler cap 10, that is, to the outside of the automobile 101.

  Then, the pressure inside the fuel tank 100 immediately becomes a pressure state of less than 5 kPa due to this discharge, and the elevating member 23 and the valve body 22 are raised by the biasing force of the spring 17. The lateral periphery CF is in point contact with the top of the plurality of ridges 16T (or the lateral periphery CF of the valve body 22 is in line contact with the inner side surface 16E1), and the valve portion The VA (or the valve part VB) is closed to be in the state as shown in FIG. Therefore, the valve mechanism portion has a function as a safety valve, and fuel consumption can be improved, and environmental pollution can be prevented.

  Although the description based on FIGS. 19 to 21 is about the operation when the fuel tank 100 is in a substantially horizontal state, the same applies to the operation when the fuel tank 100 is inclined.

  That is, when the opening pressure of the valve portion VA (or the valve portion VB) is set to 5 kPa, for example, even if the fuel tank 100 is inclined, if the pressure in the fuel tank 100 is less than 5 kPa, The valve portion VA (or the valve portion VB) is not opened. Therefore, the valve mechanism portion has a function as a safety valve, and fuel consumption can be improved, and environmental pollution can be prevented.

  When the fuel tank 100 is inclined, for example, when the VOC gas or fuel having a pressure of 5 kPa or more flows into the cylinder main body 16, the valve body 22 is the second side wall 16 E of the cylinder main body 16. Point contact with the apexes of the plurality of ridges 16T protruding from the inner side surface 16E1 of the second case (or the valve body 22 makes line contact with the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16) ), The valve 22 descends downward by the descent stroke of the elevating member 23, and the VOC gas in the fuel tank 100 and the fuel pass through the fuel filler cap 10 to the outside of the automobile 101. Released.

(5-2) An embodiment in which the biasing force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22 (see FIGS. 19, 21 and 22)
In the embodiment shown in FIGS. 19 to 21, the biasing force of the spring 17 is 1.0 or more times the total weight of the elevating member 23 and the valve body 22 (see FIGS. 8 and 13), For example, although it is 1.1 or more and 2.0 or less times, the embodiment made into less than 1.0 times, for example, 0.8 or more times and 0.93 or less times is explained.

  As shown in FIG. 21, in the embodiment in which the fuel tank 100 is in a substantially horizontal state, the fuel tank 100 is approximately horizontal, regardless of the pressure value in the fuel tank 100. The elevating member 23 and the valve body 22 are lowered in a state in which the spring 17 is compressed with an urging force less than the total weight of the valve body 22 and the elevating member 23.

  Therefore, the valve body 22 does not make point contact with the convex portion 16T of the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16 (or the valve body 22 does not make line contact with the inner side surface 16E1 ), The valve part VA (or the valve part VB) is open.

  However, when the fuel tank 100 is inclined, the weight applied to the spring 17 of the elevating member 23 and the valve body 22 is reduced according to the inclination angle until the inclination angle becomes 90 degrees. The spring 17 will increase its extension length. Therefore, as the weight applied to the spring 17 is reduced, the valve body 22 is pushed up by the biasing force of the spring 17 and eventually the length of the spring 17 becomes a predetermined length. The outer periphery CF in the lateral direction is pressed against and contacted with the top portion (or the valve body 22 is the inner side surface 16E1) of the convex portion 16T of the second side wall 16E of the cylinder main body 16.

  Therefore, as shown in FIG. 22, when the fuel tank 100 is inclined, the fuel flows through the opening 33B of the spring 33 to the groove 52B of the second resistance member 52 and the communication port 52C. The groove 52A, the groove 51D of the first resistance member 51, the communication port 51E and the groove 51C, and the small diameter space 50S1 around the upper portion 51B enter the space 23S of the elevating member 23. At this time, the pressure of the fuel is decreased at the communication port 51E of the first resistance member 51, and the upper portion 51B of the first resistance member 51 passes the small diameter space 50S1 around the upper portion 51B. The fuel whose pressure is also reduced and the flow velocity is accelerated is jetted into the space 23S of the lift member 23. Therefore, in conjunction with the biasing force of the spring 17, the elevating member 23 and the valve body 22 are quickly pushed up to close the valve portion VA (or the valve portion VB).

  In the embodiment (5-2), 5 kPa is the first passage resistance (or the second passage resistance) set by the size of the area of the valve portion VA (or the valve portion VB), and The pressure value is set by the magnitude of the biasing force of the spring 17 less than the total weight of the valve body 22 and the elevating member 23. In addition, 5 kPa in embodiment of (6-1) and (7-2) demonstrated below is a pressure value similar to (5-2).

  As described above, in the inclined state of the fuel tank 100, the valve portion VA (or the valve portion VB) is closed until it reaches the predetermined value, for example, 5 kPa. Due to the first passage resistance (or the second passage resistance) set in the valve portion VB), the fuel in the first space S1 is the lower portion of the side wall of the large diameter portion 23A of the elevating member 23 and the fuel A gap with the blowing member 50, the first space S1 (the gap 35), the second space S2 (including the first air passage 15), the outside of the fuel tank 100 through the opening S3, ie, the above It does not flow out of the filler cap 10.

  Therefore, the release of the fuel to the outside of the fuel tank 100 is suppressed, the valve mechanism portion has a function as a safety valve, and fuel consumption can be improved, and environmental pollution can be prevented.

  Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa in a state where the fuel tank 100 is inclined, the elevating member against the biasing force of the spring 17 23 and the valve body 22 are lowered to open the valve portion VA (or the valve portion VB).

  When the fuel tank 100 returns to the horizontal state (including the “generally horizontal state”), the total weight of the elevating member 23 and the valve body 22 lowers them and the valve portion VA (or the valve part VB) is opened regardless of the pressure value in the fuel tank 100.

(6) Third embodiment of the filler cap 10 The following descriptions (6-1) and (6-2) are for the filler cap 10 using the valve part VA, The present invention can also be applied to the filler cap 10 using the valve portion VB.

(6-1) An embodiment in which the biasing force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22 (see FIGS. 23 and 24)
Next, another embodiment of the filler cap 10 will be described with reference to FIGS. 23 and 24. The operation of the configuration different from the embodiment based on FIGS. 19 to 22 will be mainly described.

  First, the inner lid 13 is accommodated in the outer lid 12 in a state where the cylinder main body 16 of the inner lid 13 is inserted into the hollow portion 38A of the filter 38, and the inner lid 13 and the outer lid 12 Is fixed, for example, with the valve body 22 mounted on the elevating member 23, the elevating member 23 is accommodated in the space of the cylinder main body 16. Then, the small diameter portion 23B of the elevating member 23 enters the second space S2 with the valve body 22 mounted, and the large diameter portion 23A enters the first space S1. .

  Next, the spring 17 is accommodated in the space 23S of the elevating member 23, and the upper surface of the second resistance member 52 is in contact with the lower surface of the large diameter portion 50C of the blowing-up member 50. The large diameter portion 50C and the second resistance member 52 are accommodated in a hollow cylindrical cylinder 13J suspended from the bottom wall 13A of the inner lid 13 at the lower part of the portion 16G.

  Then, the upper surface of the disc-like lid 53 provided at its central portion with the small diameter space 53A and the large diameter space 53B communicating with the lower portion of the small diameter space 53A abuts on the lower surface of the second resistance member 52. The lid 53 is attached to the inner lid 13 by fitting the ring-shaped fitting groove 53C formed in the upper surface of the lid 53 to the cylinder 13J.

  Further, the lid 53 is configured such that the upper portion 51B of the first resistance member 51 is inserted into the small diameter space 53A of the lid 53 and the lower portion 51A is accommodated in the large diameter space 53B. The first resistance member 51 is attached to the

  Similar to the structure shown in FIG. 12, the female screw 13E formed on the inner side surface of the outer cylindrical portion 13D formed on the lower portion of the inner lid 13 and the male screw formed on the fuel inlet 98 The filler cap 10 is attached to the filler opening 98 by screwing with a part.

  The valve mechanism section in the embodiment shown in FIGS. 23 and 24 includes the cylinder main body 16, the elevating member 23, the valve body 22, the spring 17, the blowing member 50, and the first resistance member 51. And the second resistance member 52 and the like.

  In the embodiment shown in FIGS. 23 and 24, the biasing force of the spring 17 is less than 1.0 times, for example, 0.8 times or more to the total weight of the elevating member 23 and the valve body 22. The effect will be described below, with .93 times or less.

  As shown in FIG. 23, in the embodiment in which the fuel tank 100 is in a substantially horizontal state, the fuel tank 100 is in a substantially horizontal state, regardless of the pressure value in the fuel tank 100. The elevating member 23 and the valve body 22 are lowered in a state in which the spring 17 is compressed with an urging force less than the total weight of the valve body 22 and the elevating member 23.

  Therefore, the valve body 22 does not contact the convex portion 16T (or the inner side surface 16E1 of the second side wall 16E) formed on the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16, The valve portion VA (or the valve portion VB) is open.

  However, when the fuel tank 100 is inclined, the weight applied to the spring 17 of the elevating member 23 and the valve body 22 is reduced according to the inclination angle until the inclination angle becomes 90 degrees. The length of the spring 17 is increased. Therefore, as the weight applied to the spring 17 decreases, the valve body 22 is pushed up by the biasing force of the spring 17, and eventually, when the length of the spring 17 becomes a predetermined length, the valve body 22 is It will be in contact with the convex portion 16T of the second side wall 16E of the cylinder main body 16 (or the inner side surface 16E1 of the second side wall 16E).

  Therefore, as shown in FIG. 24, when the fuel tank 100 is inclined, the fuel via the groove 51D of the first resistance member 51 is decompressed at the communication port 51E, and then the groove 51C is formed. The pressure of the fuel passing through the small diameter space 53A around the upper portion 51B is also reduced by the upper portion 51B of the first resistance member 51 although it passes into the small diameter space 53A of the lid 53, and further the groove The fuel via 52B is decompressed at the communication port 52C, and then jets out from the small diameter space 50S1 into the space 23S of the elevating member 23 through the groove 52A and the large diameter space 50S2 of the blowing member 50. . Therefore, in conjunction with the biasing force of the spring 17, the elevating member 23 and the valve body 22 are quickly pushed up, and the lateral outer periphery CF of the valve body 22 is pressed against the top of the convex portion 16T. Then, the valve portion VA (or the valve portion VB) is closed in point contact (or the lateral periphery CF is in line contact with the inner side surface 16E1 of the second side wall 16E).

  As described above, in the inclined state of the fuel tank 100, the valve portion VA (or the valve portion VB) is closed until it reaches, for example, 5 kPa, so the valve portion VA (or the valve portion VB) is set. The fuel in the first space S1 is a gap between the blowout member 50 and the lower portion of the side wall of the large diameter portion 23A of the elevating member 23 due to the first passage resistance (or the second passage resistance) The first space S1 (the gap 35), the second space S2 (including the first air passage 15 or the second air passage 15A), the outside of the fuel tank 100 through the opening S3, ie, the above It does not flow out of the filler cap 10.

  Therefore, the release of the fuel to the outside of the fuel tank 100 is suppressed, the valve mechanism portion has a function as a safety valve, and fuel consumption can be improved, and environmental pollution can be prevented.

  Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa in a state where the fuel tank 100 is inclined, the elevating member against the biasing force of the spring 17 23 and the valve body 22 are lowered to open the valve portion VA (or the valve portion VB).

  When the fuel tank 100 returns to the horizontal state (including the “generally horizontal state”), the total weight of the elevating member 23 and the valve body 22 lowers them and the valve portion VA (or the valve part VB) is opened regardless of the pressure value in the fuel tank 100.

(6-2) An embodiment in which the biasing force of the spring 17 is 1.0 times or more of the total weight of the elevating member 23 and the valve body 22 (see FIG. 23)
Next, although it is a structure as shown in FIG. 23, the biasing force of the spring 17 is 1.0 times or more, for example 1.1 or more, of the total weight of the elevating member 23 and the valve body 22. The operation of the filler cap 10 will be described with respect to an embodiment in which it is set to 0 times or less.

  First, when the fuel tank 100 is substantially horizontal and the outside air temperature rises while the engine 99 is stopped, the internal pressure in the fuel tank 100 is increased even if the internal pressure in the fuel tank 100 is increased. For example, if it is less than 5 kPa, the outer periphery CF of the valve body 22 in the lateral direction is pressed against the top portion of the convex portion 16T by the biasing force of the spring 17 to make point contact (or the outer periphery CF of the lateral direction Is in line contact with the inner side surface 16E1 of the second side wall 16E), the valve portion VA (or the valve portion VB) is closed, and the valve portion VA (or the valve portion VB) is set to the second According to one passage resistance (or the second passage resistance), the VOC gas or the fuel in the first space S1 is supplied to the outside of the fuel tank 100 through the second space S2 and the opening S3, ie, supplied Not released to the mouth cap 10 outside.

  At this time, the communication port 51E is formed in the first resistance member 51, and the cylindrical upper portion 51B of the first resistance member 51 in the small diameter space 53A of the lid 53 is present. Since the communication port 52C is formed in the resistance member 52 and the passage resistance is increased, the pressure of the VOC gas or the fuel flowing into the cylinder main body 16 is reduced. The discharge outside the fuel tank 100 is suppressed.

  For this reason, since the harmful VOC gas evaporated from the fuel or the fuel is not released to the outside of the automobile 101, the valve mechanism portion has a function as a safety valve, and it is possible to improve the fuel consumption and the environment. Contamination can be prevented.

Then, similarly, while the engine 99 is stopped, the generation amount of the VOC gas further increases with the further increase of the outside air temperature, or the inside of the fuel tank 100 is full of the fuel or is near this. Under the conditions, when the fuel expands and the pressure in the fuel tank 100 is further increased, for example, to 5 kPa, the VOC gas from the fuel tank 100 or the fuel from the fuel tank 100 is detected by the first resistance member 51. Groove 51D, the communication port 51E and the groove 51C, the small diameter space 53A around the upper portion 51B, the groove 52B of the second resistance member 52, the communication port 52C and the groove 52A, the blowup member 50 diameter space 50S2 and enters into the space 23S of the elevation member 23 via the small diameter space 50S1, further of the large diameter portion 23A of the lifting member 23 A gap between the lower portion of the side wall and the blowing member 50, the first space S1 (the gap 35), the second space S2 (including the first air passage 15 or the second air passage 15A), the opening S3. The space 12S, the space 44, the air passage 43, and the gap 40 are discharged to the outside of the automobile 101 through the filler cap 10.

  That is, the high pressure VOC gas or the expanded fuel in the first air passage 15 (or the second air passage 15A) formed in the second side wall 16E is the valve portion VA (or the valve portion VB) Rising against the set first passage resistance (or the second passage resistance) to pass through the valve portion VA (or the valve portion VB). For this reason, the VOC gas or the fuel rising through the valve portion VA (or the valve portion VB) acts to push the valve body 22 downward from diagonally above.

  Accordingly, the lower portion of the side wall of the large diameter portion 23A of the elevating member 23 abuts on the upper surface of the large diameter portion 50C of the blowing member 50 against the biasing force of the spring 17 by the VOC gas or the fuel. The valve body 22 and the elevating member 23 are lowered until the valve portion VA (or the valve portion VB) is opened (see FIG. 23).

  For this reason, when the pressure in the fuel tank 100 reaches 5 kPa and the valve portion VA (or the valve portion VB) is opened as described above, the excessive pressure in the fuel tank 100 (the VOC gas may be reduced) And the fuel is discharged to the outside of the automobile 101 through the filler cap 10.

  Then, the pressure inside the fuel tank 100 immediately becomes a pressure state of less than 5 kPa due to this discharge, and the elevating member 23 and the valve body 22 are raised by the biasing force of the spring 17. The lateral outer periphery CF is in point contact with the apex of the plurality of ridges 16T (or the lateral outer periphery CF is in line contact with the inner side surface 16E1 of the second side wall 16E), The valve portion VA (or the valve portion VB) is closed. Therefore, the valve mechanism portion has a function as a safety valve, and fuel consumption can be improved, and environmental pollution can be prevented.

  That is, when the opening pressure of the valve portion VA (or the valve portion VB) is set to 5 kPa, for example, even if the fuel tank 100 is inclined, if the pressure in the fuel tank 100 is less than 5 kPa, The valve portion VA (or the valve portion VB) is not opened. Therefore, the valve mechanism portion has a function as a safety valve, and fuel consumption can be improved, and environmental pollution can be prevented.

  When the fuel tank 100 is inclined, for example, when the VOC gas or fuel having a pressure of 5 kPa or more flows into the cylinder main body 16, the valve body 22 is the second side wall 16 E of the cylinder main body 16. The valve body 22 of the elevating member 23 is in a state of point contact with the apexes of the plurality of ridges 16T projecting to the inner side surface 16E1 of the above (or in a state of line contact with the inner side surface 16E1). It falls downward for the downward stroke, and the VOC gas and the fuel in the fuel tank 100 are discharged to the outside of the automobile 101 through the filler cap 10.

  In the embodiment of (6), although the second resistance member 52 is used, the first resistance member 51 may not necessarily be used.

(7) First Embodiment of Valve Mechanism 60 (See FIGS. 1 to 25)
The descriptions of (7-1) and (7-2) below are for the valve mechanism 60 using the valve part VA, but also for the valve mechanism 60 using the valve part VB Applicable

(7-1) An embodiment in which the biasing force of the spring 17 is 1.0 times or more of the total weight of the elevating member 23 and the valve body 22 (see FIGS. 1 to 25).
All the embodiments shown in FIGS. 1 to 24 above are for the filler cap 10 shown in FIG. 1 which shows a schematic view of the automobile 101, which has the same structure as the filler cap 10 Can be used as the valve mechanism 60 (see FIG. 25), which will be described below.

  First, as shown in FIG. 25, when filling the gasoline G as the fuel into the fuel tank 100, the filler cap 61 different from the filler cap 10 is configured to supply fuel on the upper surface of the fuel tank 100. It opens and closes the mouth.

  That is, the inside of the fuel tank 100 and the atmosphere communicate with each other through the filler port, the filler cap 61 can be opened, gasoline G can be injected into the fuel tank 100, and the filler cap 61 is closed. Said communication with the atmosphere via the filling port is interrupted.

Further, the valve mechanism 60 having the same structure as the filler cap 10 described with reference to FIGS. 1 to 24 is provided on the upper surface of the fuel tank 100. Then, the valve body device of the fuel tank 100 is configured by the filler cap 61 and the valve mechanism 60 described above. A pump 62 supplies the gasoline G in the fuel tank 100 to the engine 99 through a pipe 63 .

  As described above, by configuring, first, the biasing force of the spring 17 is 1.0 times or more, for example, 1.1 or more to 2.0 times or less of the total weight of the elevating member 23 and the valve body 22. The operation of the valve mechanism 60 will be described for the case of

  First, with the fuel tank 100 generally horizontal or inclined, even when the outside air temperature rises and the internal pressure in the fuel tank 100 increases while the engine 99 is stopped, the inside of the fuel tank 100 is If the internal pressure is, for example, less than 5 kPa, as described above, the outer periphery CF of the valve body 22 in the lateral direction is pressed against the top of the convex portion 16T by the biasing force of the spring 17 to make point contact (Or similarly, the lateral outer periphery CF makes line contact with the inner side surface 16E1 of the second side wall 16E), the valve portion VA (or the valve portion VB) is closed, and the valve portion VA (or the valve The VOC gas or the fuel in the first space S1 is set via the second space S2 and the opening S3 by the first passage resistance (or the second passage resistance) set in the portion VB). The fuel tank 100 outside, i.e. not released to the valve mechanism 60 outside.

  Similarly, when the fuel tank 100 is in a substantially horizontal state or inclined state, the generation amount of the VOC gas is further increased with the further rise of the outside air temperature during the stop of the engine 99, or the fuel tank 100 When the fuel expands and the pressure in the fuel tank 100 further increases, for example, reaches 5 kPa, the VOC gas from the fuel tank 100 or the VOC gas or As the fuel rises, the VOC gas or the fuel rises in the first air passage 15 (or the second air passage 15A) formed in the second side wall 16E of the cylinder main body 16, and the valve portion VA (Or the valve part VB), the rising VOC gas or the fuel pushes the valve element 22 downward, causing an excessive pressure to the outside of the fuel tank 100. To release.

(7-2) An embodiment in which the biasing force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22 (see FIGS. 1 to 25).
Next, when the biasing force of the spring 17 is less than 1.0 times, for example, 0.8 times to 0.93 times the total weight of the elevating member 23 and the valve body 22, the valve The operation of the mechanism 60 will be described.

  In the embodiment of 0.8 times or more and 0.93 times or less, when the fuel tank 100 is in a substantially horizontal state, the elevating member 23 and the elevating member 23 are independent of the pressure value in the fuel tank 100. The valve body 22 is lowered in a state where the spring 17 is compressed with an urging force less than the total weight of the valve body 22 and the elevating member 23. Therefore, the valve body 22 does not contact the convex portion 16T (or the inner side surface 16E1) formed on the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16, and the valve portion 22 (or the valve body 22) The valve part VB) is open.

  However, when the fuel tank 100 is inclined, the weight applied to the spring 17 with the elevating member 23 and the valve body 22 is reduced according to the inclination angle until the inclination angle becomes 90 degrees, The length of the spring 17 compressed when the fuel tank 100 is horizontal increases as the inclination angle increases. Therefore, as the weight applied to the spring 17 is reduced, the valve body 22 is pushed up by the biasing force of the spring 17 and eventually the length of the spring 17 becomes a predetermined length. The outer periphery CF in the lateral direction is pressed against the top of the convex portion 16T formed on the inner side surface 16E1 of the second side wall 16E of the cylinder main body 16 to make point contact (or line contact with the inner side surface 16E1) It becomes.

  Therefore, when the fuel tank 100 is inclined, as described above, the fuel flows into the elevating member 23 to increase the pressure in the elevating member 23 until it reaches 5 kPa, for example. Together with the biasing force of the spring 17, the lifting member 23 and the valve body 22 are pushed up to close the valve portion VA (or the valve portion VB), and the valve portion VA (or the valve portion VB). The fuel in the first space S1 is set outside the fuel tank 100 via the second space S2 and the opening S3 by the first passage resistance (or the second It does not flow to the outside of the valve mechanism 60.

  Therefore, the release of the fuel to the outside of the fuel tank 100 is suppressed, the valve mechanism portion of the valve mechanism 60 has a function as a safety valve, and fuel consumption can be improved and environmental pollution is prevented. can do.

  Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa in a state where the fuel tank 100 is inclined, the elevating member against the biasing force of the spring 17 23 and the valve body 22 are lowered to open the valve portion VA (or the valve portion VB).

  When the fuel tank 100 returns to the horizontal state (including the “generally horizontal state”), the total weight of the elevating member 23 and the valve body 22 lowers them and the valve portion VA (or the valve part VB) is opened regardless of the pressure value in the fuel tank 100.

(8) Second Embodiment of Valve Mechanism 60 (See FIGS. 26 to 29)
Next, based on FIGS. 26 to 29, when the valve body device of the fuel tank 100 is configured by the filler cap 61 and the valve mechanism 60 (see FIG. 25), The second embodiment will be described below. However, although the valve body 22, the elevating member 23, the spring 17, the blowing member 50 and the first resistance member 51 shown in FIG. 19 are omitted in FIG. Use.

(8-1) An embodiment in which the biasing force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22 (see FIGS. 26 to 28).
In the embodiments shown in FIG. 26 to FIG. 28 below, the total weight of the elevating member 23 and the valve body 22 of the biasing force of the spring 17 is less than 1.0 times, for example, 0.8 times or more It is 0.93 times or less and will be described below.

  Reference numeral 70 denotes a cylinder main body, an inner cylinder main body 71 accommodating the valve body 22 and the elevating member 23, and an outer end of the upper end portion cut away so as to allow the fluid to pass therethrough. A hollow cylindrical outer cylinder main body portion 72 which forms the portion 72A and is cut at four places to form an opening 72B, and a connecting portion 73 which connects the inner cylinder main body portion 71 and the outer cylinder main body portion 72 The lower end portion of the outer cylinder main body portion 72 is provided with an attaching portion 74 which is stepped outward from the connecting portion 73 and extends outward. Therefore, the inner cylinder main body portion 71 is connected to the lower portion of the outer cylinder main body portion 72 through the connecting portion 73 at a substantially central position of the outer cylinder main body portion 72.

  The inner cylinder main body 71 has a cylindrical first side wall 71C, a lower horizontal wall 71D provided on the upper side of the first side wall 71C, and a second side wall 71E provided on the upper side of the lower horizontal wall 71D. An upper horizontal wall 71F is provided at the center of the second side wall 71E, and has an opening 71S communicating with the space in the inner cylinder main body 71 and the outside of the fuel tank 100 (atmosphere). Be done. The first side wall 71C, the lower horizontal wall 71D, and the second side wall 71E form a storage portion 71A of the leaked fuel, which will be described later. The second side wall 71E has an inner side surface 71E1 whose inner diameter decreases as it goes upward.

  The inner side surface 71E1 (the inner side surface 71E1 forms a second space S32 described later) of the second side wall 71E of the inner cylinder main body 71 is vertically long and has a predetermined interval. A plurality of inward protruding convex portions 71T are formed, and a first air passage is formed between the convex portions 71T.

  An inner end portion of the connecting portion 73, that is, a lower end portion of the first side wall 71C of the inner cylinder main body 71 is cut away to form a third space S33, and the third space S33 is in the inner cylinder main body 71. It communicates with the second space S32 having a truncated cone shape via the first space S31 having a cylindrical shape. A ring-shaped storage groove 74A is cut out from below on the lower surface of the mounting portion 74. Then, in the fourth space S34, which is formed by the step between the connecting portion 73 and the mounting portion 74, and the thick portion 82T having a circular shape in plan view of the central portion of the mounting member 82 communicates with the third space S33 from below. When the cylinder main body 70 is fixed to the mounting member 82 using the bolt 80 and the nut 81 in the state of being fitted to the bolt 80, the bolt 80 is further provided at an intermediate position with the peripheral end of the mounting portion 74. A plurality of mounting holes 74B are formed for inserting the.

  That is, when the cylinder main body 70 is fixed to the mounting member 82 using the bolt 80 and the nut 81, the mounting hole 74B and the mounting are installed with the O-ring 86 stored in the storage groove 74A. The bolt 80 is inserted into both holes so that the nut 81 is tightened and fixed (the left half of the mounting member 82 shown in the lowermost part of FIG. 26, FIG. 27). And see the left half of FIG. Further, in the case of fixing by ultrasonic welding, the surface on which the storage groove 74A is formed in a state in which the welding rib 82A having a circular shape in a plan view and circular shape protruding from the upper surface of the mounting member 82 The tube main body 70 is fixed to the mounting member 82 by ultrasonic welding (see the right half of the mounting member 82 shown in the lowermost part of FIG. 26, see the right half of FIGS. 27 and 28).

A hollow cylindrical tubular portion 82C is provided which has a space (communication path) 82S1 provided at the lower part of the mounting member 82 and communicating with the communication port 82S2 formed in the thick portion 82T of the mounting member 82. A hollow attachment cylinder portion 100B is provided on the upper surface of the fuel tank 100 with a female screw portion 82D formed on the inner side surface of the portion 82C and a space communicating with the opening opened on the upper surface of the fuel tank 100. . Then, an external thread is formed on the outer surface of the mounting cylindrical portion 100B, and the external thread and the internal thread 82D formed on the cylindrical portion 82C are screwed together to the fuel tank 100. The valve mechanism 60 can be attached.

  And, in a state where a space is left in the space in the outer cylinder main body portion 72 with the side wall of the outer cylinder main body portion 72, a porous material such as an activated carbon filter excellent in oil resistance or a filter made of urethane synthetic resin A storage member 75 for storing the filter 79 therein is disposed, and when the engine 99 is driven to introduce the atmosphere into the fuel tank 100, the filter 79 filters the atmosphere to obtain the atmosphere. It collects foreign substances such as dust and prevents them from entering the fuel tank 100. The lower portion of the storage member 75 is fitted and attached to the upper portion of the first side wall 71C of the inner cylinder main body portion 71. However, the storage member 75 and the cylinder main body 70 are not limited to the case of integrating separate ones, but may be manufactured integrally from the beginning.

  More specifically, the storage member 75 has a hollow cylindrical shape, and a large diameter space 76S is formed, and the upper end thereof is cut at four positions with a predetermined interval so that the fluid can pass therethrough. An opening 77S having a diameter smaller than that of the small-diameter space 78S is opened by connecting the large-diameter portion 76 in which the small-diameter space 78S is formed, and the large-diameter portion 76 and the small-diameter portion 78 And a connecting portion 77. The upper surface of the connecting portion 77 is inclined downward so that the connecting portion 77 becomes thinner gradually from the outer side to the inner side. Further, four ribs 77A are formed on the upper surface of the connecting portion 77 at a predetermined interval, and the ribs 77A are formed at the opening of the connecting portion 77 from the inner side surface of the large diameter portion 76. It extends to a length not reaching the inner end of 77S, and the upper surface of the rib 77A is formed horizontally so as to support the filter 79 horizontally.

  Then, the inner cylinder main body portion 71 is fitted to the storage member 75 in a state where the upper portion of the first side wall 71C of the inner cylinder main body portion 71 is in contact with the inner side surface of the small diameter portion 78 and the lower surface of the connecting portion 77. Thus, the storage member 75 is attached to the inner cylinder main body 71.

The upper lid 88 has a cylindrical shape with a bottom and has a circular shape in a plan view, and has an upper wall 88A having an arc-like longitudinal cross section and a side wall 88B hanging down from the peripheral end of the upper wall 88A. When the upper cover 88 is attached to the upper portion of the outer cylinder main body portion 72 of the cylinder main body 70, the space in the housing member 75 is the opening 76A of the housing member 75 and the outer cylinder main body of the cylinder main body 70. The opening 72B of the portion 72, the cut-out portion 72A, and the recess 88D of the upper lid 88 communicate with the atmosphere.

In two opposite of said upper lid 88, the upper wall 88A guide member 89 diameter of the insertion hole 89A from the outer diameter of and a head with a large diameter than the outer diameter of the shaft portion is opened in the rear surface to the threaded 90 wherein It is formed to extend inward from the peripheral end of the upper wall 88A , and an insertion hole 88C concentric with the insertion hole 89A and larger in diameter than the insertion hole 89A is formed in the upper lid 88 (from the head of the screw 90 Large diameter) is established. Further, the concave portion 88D is formed on the inner side surface of the side wall 88B of the upper lid 88 every 45 degrees.

  In the filter 79, a concave portion 79A in a plan view semicircular shape extending in the vertical direction is formed at two opposing positions, and the shape of the filter 79 accommodated in the large diameter portion 76 of the accommodation member 75 is matched. Recesses 76 </ b> B in a plan view semi-circular shape extending in the vertical direction are formed at two opposing places. Then, on the upper portion of the outer cylinder main body portion 72, a bulging portion in a plan view semi-circular shape extending in the up and down direction in two places opposing to the shape of the large diameter portion 76 of the storage member 75 to be stored. 72C is formed. Further, in the bulging portion 72C, a screw groove 72D in which the screw 90 is screwed is formed.

  The length of the spring 17 disposed in the space 23S of the elevating member 23 is between the lower surface of the stepped wall 23E of the elevating member 23 and the upper surface of the stepped portion 50B of the blowing member 50 (see FIG. The embodiment of Figures 19 to 29 is similar: in the embodiment of Figures 7 to 11 between the lower surface of the step wall 23E and the upper surface of the spring 33, in the embodiment of Figure 12 the lower surface of the step wall 23E and the And the length of the movable stroke of the elevating member 23 is, for example, not less than 1.0 times and not more than 3.0 times the movable stroke of the elevating member 23. The total weight of the valve body 22 and the lifting member 23 determines the length of the fuel tank 100 to be compressed when the fuel tank 100 is horizontal. In this case, if the amount of compression is large, the repulsive force of the spring 17 ("the urging force to return", the same applies hereinafter) increases, so depending on the magnitude of the repulsive force depending on the degree of compression of the spring 17, The pressure that allows the fuel flowing into the fuel tank 100 at the time of inclination of the fuel tank 100 to pass through the valve portion VE is set by the first passage resistance set according to the size of the area of the fuel cell.

  Here, the valve portion VE, which has a structure similar to that of the valve portion VA described above, has a plurality of strips in which the outer periphery CF of the valve body 22 in the lateral direction described above protrudes to the inner side surface 71E1 of the second side wall 71E. The portion CF1 of the outer periphery in the lateral direction where the valve body 22 does not make point contact between the portions pressed against the top of the convex portion 71T so as to make point contact, the center CO of the valve body 22 and the outer periphery CF in the lateral direction Cutting the inner surface 71E1 forming the first air passage and the convex portions 71T adjacent to the inner surface 71E1 with the surface extending outward to the surface CS (for example, a conical surface) And a first communication port which is a cut end of the first air passage.

  In the case of replacing the valve part VE in the embodiment of (8) with a structure similar to that of the valve part VB, the above-mentioned lateral periphery CF of the valve body 22 has the second side wall. A portion CF2 of the outer periphery in the lateral direction which does not make line contact of the valve body 22 between the portions which are in line contact with the inner side surface 71E1 of 71E by pressing on the inner side surface 71E1; Extending from the surface CS (e.g., an edge surface) formed by connecting the two air channels to the cut surface of the second air channel for forming the recess forming the second air channel. It comprises of a certain second communication port.

  Therefore, when the fuel tank 100 is inclined, the valve body 22 and the elevating member 23 are pushed up by the repulsive force of the spring 17 and the pressure of the inflowing fuel, and the upper hemisphere of the valve body 22 in the vertical direction For example, the lateral outer periphery CF at the 1/2 position is pressed against the top of the convex portion 71T of the second side wall 71E of the inner cylinder main body 71 to make point contact (or the second side wall 71E The valve portion VE (or the valve portion having the same structure as that of the valve portion VB) is closed by pressing the inner side surface 71E1 into line contact). Further, when the set pressure value is reached, the valve portion VE (or the valve portion having the same structure as the valve portion VB) is opened by the pressure of the inflowing fuel.

  The mounting order of the valve mechanism 60 (see FIGS. 26 to 28) to the fuel tank 100 will be described below. First, similarly to the embodiment shown in FIG. 19, the elevating member 23 is accommodated in the space of the inner cylinder main body 71 in a state where the valve body 22 is placed on the elevating member 23, for example.

  Then, the small diameter portion 23B of the elevating member 23 enters the second space S32 in a state where the valve body 22 is mounted, and the large diameter portion 23A enters the first space S31. .

  Next, the spring 17 is housed in the space 23S of the elevating member 23, and the lower portion 51A of the first resistance member 51 is housed in the large diameter space 50S2 of the blowing-up member 50, and the upper portion 51B is The small diameter space 50S1 is accommodated (disposed). The blowing member is housed in the spring 17 housed in the space 23S of the elevating member 23 such that the peripheral portion of the upper surface of the large diameter portion 50C of the blowing member 50 is in contact with the lower surface of the step 16G. The 50 small diameter portions 50A are disposed and loosely inserted. Therefore, the communication port 51E of the first resistance member 51 communicates with the small diameter space 50S1 of the blowup member 50 and the fuel tank 100.

  Then, the cylinder main body 70 is fixed to the mounting member 82. In this case, when the cylinder main body 70 is fixed to the attachment member 82 using the bolt 80 and the nut 81, the O-ring 86 is accommodated in the accommodation groove 74A. The mounting hole 74B and the mounting hole 82B of the mounting member 82 are aligned, the bolt 80 is inserted through both holes, and the nut 81 is tightened and fixed. Further, in the case of fixing by ultrasonic welding, ultrasonic welding is performed on the formation surface of the storage groove 74A in a state where the welding rib 82A on the upper surface of the attachment member 82 is fitted to the storage groove 74A. Fix it.

  Further, the filter 79 is housed in the large diameter space 76S of the housing member 75, and the upper lid 88 is covered from above with the upper portion of the housing member 75 and the upper portion of the outer cylinder main portion 72 of the cylinder main body 70. Thus, the screw 90 is inserted into the insertion holes 88C, 89A and screwed into the screw groove 72D formed in the bulging portion 72C of the outer cylinder main body 72 along the recess 79A of the filter 79. Then, the upper lid 88 is attached and fixed to the outer cylinder main body portion 72 of the cylinder main body 70.

  Thus, the assembly of the valve mechanism 60 is completed. The valve mechanism 60 assembled in this manner is formed on the male screw portion of the mounting cylindrical portion 100B provided on the upper surface of the fuel tank 100 and the cylindrical portion 82C of the mounting member 82. The valve mechanism 60 can be attached to the fuel tank 100 by screwing the female screw 82D.

  In an embodiment in which the total weight of the elevating member 23 and the valve body 22 is less than 1.0 times, for example, 0.8 times to 0.93 times as large as the biasing force of the spring 17. If the fuel tank 100 is in a substantially horizontal state, regardless of the pressure value in the fuel tank 100, as shown in FIG. 27, the elevating member 23 and the valve body 22 are the valve body 22 and the elevating member The spring 17 is lowered in a state where the spring 17 is compressed with a biasing force less than the total weight of the force 23 and 23.

  Therefore, the valve body 22 does not contact the convex portion 71T (or the inner side surface 71E1 of the second side wall 71E) of the inner side surface 71E1 of the second side wall 71E of the inner cylinder main body 71. The part VE (or the valve part having the same structure as the valve part VB) is open.

  However, when the fuel tank 100 is inclined, the weight applied to the spring 17 of the elevating member 23 and the valve body 22 is reduced according to the inclination angle until the inclination angle becomes 90 degrees. The length of the spring 17 compressed when the fuel tank 100 is horizontal increases as the inclination angle increases. Therefore, as the weight applied to the spring 17 decreases, the valve body 22 is pushed up by the biasing force of the spring 17, and eventually, when the length of the spring 17 becomes a predetermined length, the valve body 22 is It comes into contact with the convex portion 71T of the inner side surface 71E1 of the second side wall 71E (or the inner side surface 71E1 of the second side wall 71E).

  For this reason, as shown in FIG. 28, when the fuel tank 100 is inclined, the fuel flows through the space 82S1 of the mounting member 82 through the space in the mounting cylindrical portion 100B of the fuel tank 100. The space 23S of the elevating member 23 passes through the communication port 82S2, the groove 51D of the first resistance member 51, the communication port 51E and the groove 51C, and the small diameter space 50S1 around the upper portion 51B. At this time, the pressure of the fuel is decreased at the communication port 51E of the first resistance member 51, and the upper portion 51B of the first resistance member 51 passes the small-diameter space 50S1 around the upper portion 51B. The pressure of the fuel is also reduced, and the fuel whose flow rate is increased is jetted into the space 23S of the elevating member 23. Therefore, in conjunction with the biasing force of the spring 17, the lifting member 23 and the valve body 22 are quickly pushed up to close the valve portion VE (or the valve portion having the same structure as the valve portion VB). Be

  In addition, 5 kPa which is a predetermined value to be described later in the embodiment of (8-1) is set to the size of the area of the valve portion VE (or the valve portion having the same structure as the valve portion VB) The pressure value is set by the one passage resistance (or the second passage resistance) and the magnitude of the biasing force of the spring 17 which is less than the total weight of the valve body 22 and the elevating member 23.

  As described above, when the fuel tank 100 is inclined, the valve portion VE (or the valve portion having the same structure as the valve portion VB) is closed until the predetermined value, for example, 5 kPa, is reached. The first passage resistance (or the second passage resistance) set in the valve portion VE (or the valve portion having the same structure as the valve portion VB) maintains the inner cylinder main portion 71. The fuel in the inner first space S31 does not flow into the large diameter space 76S of the storage member 75 through the opening 71S of the upper horizontal wall 71F. Therefore, the fuel does not flow out of the fuel tank 100, that is, the valve mechanism 60.

  Therefore, the release of the fuel to the outside of the fuel tank 100 is suppressed, the valve mechanism portion of the valve mechanism 60 has a function as a safety valve, and fuel consumption can be improved and environmental pollution is prevented. can do.

  Similarly, when the pressure (fluid pressure) of the fuel from the fuel tank 100 reaches, for example, 5 kPa in a state where the fuel tank 100 is inclined, the elevating member against the biasing force of the spring 17 23 and the valve body 22 are lowered to open the valve part VE (or the valve part having the same structure as the valve part VB). Therefore, the fuel flows into the storage portion 71A of the inner cylinder main body 71, the small diameter space 78S of the storage member 75, and the large diameter space 76S through the opening 71S of the inner cylinder main body 71. It will be done.

  For this reason, the filter 79 in the large diameter space 76S absorbs (takes in) the fuel into its internal space, but the fuel exceeding the amount that can be absorbed is the opening 76A of the storage member 75 and the cylinder It flows out to the outside of the valve mechanism 60 through the opening 72B of the outer cylinder main body 72 of the main body 70, the cutout 72A, and the recess 88D of the upper lid 88.

  Then, when the fuel tank 100 returns to the horizontal state (including the “generally horizontal state”), the spring 17 is compressed by the weight of the valve body 22 and the elevating member 23, and the valve body 22 and the valve body 22 are The elevating member 23 is lowered to open the valve portion VE (or the valve portion having the same structure as the valve portion VB). Then, the fuel absorbed by the filter 79 is led to the storage portion 71A via the connection portion 77, which drops directly by its own weight or whose upper surface is inclined inward. Further, when the pressure in the fuel tank 100 becomes negative due to the consumption of the fuel by the drive of the engine 99, the recess 88D of the upper lid 88, the cut-out portion 72A of the outer cylinder main body 72, the opening The fuel absorbed by the filter 79 is introduced to the storage portion 71A while air is introduced through the opening 72A of the storage member 75 through the opening 72B. As described above, the fuel stored in the storage section 71A by the weight of the fuel or by the consumption of the fuel is the pressure in the fuel tank 100 by the consumption of the fuel by the driving of the engine 99. Is returned to the fuel tank 100 together with the atmosphere, and the filter 79 is regenerated to a state before absorption of the fuel.

  In the valve mechanism 60 in the case where the biasing force of the spring 17 is less than 1.0 times the total weight of the elevating member 23 and the valve body 22, the fuel tank 100 is substantially horizontal. The communication port 51E of the first resistance member 51 and the upper portion 51B of the first resistance member 51 are generated even if the fuel wave in the fuel tank 100 is generated by vibration and the pressure by the fuel is increased. Since the pressure of the fuel is reduced by the small-diameter space 50S1 of the blow-up member 50 to be stored, the fuel is absorbed by the filter 79 even if the fuel flows upward from the opening 71S. The outflow to the outside of the valve mechanism 60 is suppressed. This is because the pressure is reduced by the first resistance member 51 and the second resistance member 52 also in the embodiment described above in (7-2), so that the fuel is similarly provided outside the valve mechanism 60. It is controlled to flow out.

(8-2) An embodiment in which the biasing force of the spring 17 is 1.0 times or more of the total weight of the elevating member 23 and the valve body 22 (see FIGS. 26 and 29)
In the embodiment shown in FIG. 29 below, the combined weight of the elevating member 23 and the valve body 22 of the biasing force of the spring 17 is 1.0 times or more, for example, 1.1 or more to 2.0 times. It will be described below.

  First, with the fuel tank 100 generally horizontal or inclined, even when the outside air temperature rises and the internal pressure in the fuel tank 100 increases while the engine 99 is stopped, the inside of the fuel tank 100 is If the internal pressure is, for example, less than 5 kPa, as described above, the convex outer periphery CF of the valve body 22 formed on the inner side surface 71E1 of the second side wall 71E of the inner cylinder main body 71 The valve portion of the portion 71T is pressed by the urging force of the spring 17 to make a point contact (or the outer periphery CF in the lateral direction also makes line contact with the inner side surface 71E1 of the second side wall 71E), and the valve portion VE (or the valve portion having the same structure as the valve portion VB) is closed, and the VOC gas or the VOC gas in the first space S31 is closed by the first passage resistance (or the second passage resistance). Serial no fuel is released the fuel tank 100 outside through the second space S32 and the opening 71S, i.e. to the valve mechanism 60 outside (see FIG. 29).

  In addition, 5 kPa which is a predetermined value to be described later in the embodiment (8-2) is set to the size of the area of the valve portion VE (or the valve portion having the same structure as the valve portion VB) The pressure value is set by the one-passage resistance (or the second-passage resistance) and the magnitude of the biasing force of the spring 17 which is equal to or more than the total weight of the valve body 22 and the elevating member 23.

  Similarly, when the fuel tank 100 is in a substantially horizontal state or inclined state, the generation amount of the VOC gas is further increased with the further rise of the outside air temperature during the stop of the engine 99, or the fuel tank 100 When the fuel expands and the pressure in the fuel tank 100 further increases, for example, reaches 5 kPa, the VOC gas from the fuel tank 100 or the VOC gas or The fuel rises from the VOC gas or the fuel in the first air passage (or the second air passage) formed in the inner side surface 71E1 of the second side wall 71E, and the valve portion VE (or the valve portion VE (or the second air passage) Passing through the valve portion of the same structure as the valve portion VB, the rising VOC gas or the fuel resists the biasing force of the spring 17 and the elevating member 2 The valve body 22 is lowered downward and opens the valve unit VE (or the valve portion of the valve portion VB similar structure). For this reason, the VOC gas or the inside of the small diameter space 78S of the storage member 75 and the large diameter space 76S of the storage member 75 through the opening 71S of the inner cylinder main body 71 is used. The fuel will flow in.

  For this reason, the VOC gas passes through the filter 79 in the large diameter space 76S, and the opening 76A of the storage member 75 and the opening 72B of the outer cylinder main body portion 72 of the cylinder main body 70 It is discharged to the outside of the valve mechanism 60 through the cutout portion 72A and the concave portion 88D of the upper lid 88. The fuel is absorbed in the space inside the filter 79 in the large diameter space 76S, but the fuel exceeding the amount that can be absorbed is the opening 76A of the storage member 75 and the cylinder main body 70 It is discharged to the outside of the valve mechanism 60 through the opening 72B of the outer cylinder main body 72, the cutout 72A, and the recess 88D of the upper lid 88. That is, the pressure of the excessive fluid (the VOC gas and the fuel) from inside the fuel tank 100 is released to the outside of the valve mechanism 60.

  Then, when the VOC gas or the fuel is released and the pressure in the fuel tank 100 becomes less than 5 kPa, the elevating member 23 and the valve body 22 are elevated by the biasing force of the spring 17, and the valve body 22. The lateral outer periphery CF of the 22 makes point contact with the plurality of ridges 71T (or the lateral outer periphery CF makes linear contact with the inner side surface 71E1 of the second side wall 71E), and the valve The part VE (or the valve part of the same structure as the valve part VB) is closed. Therefore, the valve mechanism portion has a function as a safety valve, and fuel consumption can be improved, and environmental pollution can be prevented.

  When the valve portion VE (or the valve portion having the same structure as the valve portion VB) is closed, if the fuel tank 100 is in a generally horizontal state, the fuel absorbed by the filter 79 drops directly by its own weight. It is led to the storage section 71A through the connection section 77 which falls or the upper surface is inclined inward. Further, when the pressure in the fuel tank 100 becomes negative due to the consumption of the fuel by the drive of the engine 99, the recess 88D of the upper lid 88, the cut-out portion 72A of the outer cylinder main body 72, the opening The fuel absorbed by the filter 79 is introduced to the storage portion 71A while air is introduced through the opening 72A of the storage member 75 through the opening 72B. As described above, the fuel stored in the storage section 71A by the weight of the fuel or by the consumption of the fuel is the pressure in the fuel tank 100 by the consumption of the fuel by the driving of the engine 99. Is returned to the fuel tank 100 together with the atmosphere, and the filter 79 is regenerated to a state before absorption of the fuel.

  The valve mechanism 60 of (8-1) and (8-2) can also be used as the filler cap 10 described above.

(9) Others In all the embodiments described above, the method or structure for attaching the filler cap 10 or the valve mechanism 60 to the fuel tank 100 has been described using a screw or the spring 33. Not limited thereto, the mounting method or the structure thereof is not limited. The valve mechanism 60 may be directly attached to the fuel tank 100 or may be attached indirectly via a connecting member such as a hose, and the attachment method or structure is not particularly limited.

  In all of the above-described embodiments, the valve portions VA, VB, VC, VE are the outer periphery of the valve body portion 22A of the valve body 22 or the hemispherical portion 22A1 and the cylinder body 16E. The narrowest opening among the openings formed between the inner side surface 16E1 (including the protrusion or the recess) or the inner side surface 71E1 of the inner cylinder main body 71 (including the protrusion or the recess) It is.

That is, in all the embodiments described above, the valve units VA, VB, VC, VE are:
(A-1) The outer periphery CF of the valve body 22 on the elevation member 23 in the lateral direction (or the outer periphery CP of the hemispherical portion 22A1 of the valve body 22A in the lateral direction) has a plurality of ridges 16T. 71, a portion of the outer periphery CF of the valve body 22 where the point contact does not occur between points of the valve body 22 (or a portion of the outer periphery CP of the hemispherical portion 22A1, which does not contact);
(A-2) or between the portions of the valve body 22 where the lateral outer periphery CF of the valve body 22 (or the lateral outer periphery CP of the hemispherical portion 22A1) is in line contact with the inner side surfaces 16E1 and 71E1 A portion of the lateral periphery CF not in line contact (or a portion of the lateral periphery CP not in line contact of the hemispherical portion 22A1);
(B-1) A portion of the outer periphery CF of the valve body 22 not in point contact (or a portion of the outer periphery CP of the hemispherical portion 22A1 not in point contact) and the inner side surfaces 16E1 and 71E1 and The inner side surface 16E1, 71E1 and the inner side surface 16E1 forming the first air passage so as to form the narrowest opening among the openings formed between the convex portions 16T, 71T on both sides of the side surface 16E1, 71E1. A first communication port which is a cut end of the first air passage obtained by cutting the convex portions 16T and 71T on both sides of 71E1;
(B-2) or forming the second air passage with the portion of the outer periphery CF not in line contact with the valve body 22 (or the portion of the outer periphery CP not in line contact with the hemispherical portion 22A1) It is comprised by the 2nd communication port which is a cut of the 2nd air passage which cut the field for forming the crevice so that the narrowest opening may be formed among the openings formed between the crevice.

In the above in all the embodiments described, by performing the heat insulation to the fuel tank 100, it is possible to suppress an increase in pressure in the fuel tank 100, above-described said filler cap 10 or the By combination with the valve mechanism 60, the emission of the VOC gas or the fuel to the outside of the fuel tank 100 can be further suppressed, fuel consumption can be improved, and environmental pollution can be prevented. It is also possible to respond to the California test method of

According to the embodiment described above, compared to the techniques disclosed in Patent Documents 1 and 2 described above, the harmful VOC gas evaporated from the fuel or the environment can be further released without releasing the fuel to the outside. It is possible to provide the filler cap 10 or the valve mechanism 60 of the fuel tank which can prevent the contamination and can improve the fuel consumption.

  As described above, although the embodiments of the present invention have been described, various alternatives, modifications, and variations are possible for those skilled in the art based on the above description, and the present invention is not limited to the above within the scope of the present invention. Alternatives to, including modifications or variations.

DESCRIPTION OF REFERENCE NUMERALS 10 filler cap 12 outer lid 13 inner lid 15 first air passage 15A second air passage 16 cylinder main body 16E1 inner side surface 16T convex portion 17 spring 22 valve body 23 elevating member 23A large diameter portion 23B small diameter portion 23S space 24, 25 air Passage 50 Blow-up member 50S1 Small-diameter space 50S2 Large-diameter space 51 First resistance member 51E Communication port 52 Second resistance member 52C Communication port 60 Valve mechanism body 61 Filler cap 70 Tube main body 71 Inner cylinder main body 71A Storage 71E Second side wall 71E1 inner side surface 71S opening 72 outer cylinder main body portion 73 connecting portion 74 mounting portion 75 storage member 79 filter 82 mounting member 98 fuel filler 100 fuel tank S1 first space S2 second space S2 second space S3 opening VA, VB, VE valve portion RA first Communication port RB second communication port

Claims (3)

An air passage for connecting the inside and the outside of the fuel tank and a valve mechanism portion provided in the air passage are provided in a cap body attached to a fuel supply port of the fuel tank and including an outer lid and an inner lid. A fuel tank filler cap that
The valve mechanism unit
A cylindrical first space provided at a substantially central position on the inner surface side of the inner lid and communicating with the inside of the fuel tank, a second space having a frusto-conical shape communicating with the first space from above, and the second space And an opening communicating with the outside of the fuel tank is formed in the upper surface, and a plurality of projections projecting inward at a distance from the upper surface in the vertical direction are formed on the inner side surface forming the second space. A second air passage is formed by forming a plurality of concave portions which are long in the vertical direction and spaced apart in the first air passage or the inner side surface which is formed between the convex portions by forming a portion. The tube body,
It has a bottomed hollow cylindrical shape having an upper surface and an open lower surface, and a large diameter portion at a lower portion accommodated in the first space and an upper small diameter at an upper portion exhibiting an outer shape accommodated in the second space. A lifting member comprising
Or the outer periphery in the lateral direction is in point contact with the plurality of ridges projecting on the inner side surface of the cylinder main body which is placed on the upper surface of the small diameter portion of the elevating member and which forms the second space A spherical valve body whose outer periphery in the lateral direction is in line contact with the inner side surface of the cylinder main body forming the second space;
It arranges in the space of the large diameter part of the raising and lowering member, pushes up the raising and lowering member, and presses the lateral periphery of the valve body placed on the small diameter part to the plurality of ridges Urge the point member into contact or push up the raising and lowering member to press the outer periphery of the valve body placed on the small diameter portion against the inner surface of the cylinder main body for line contact And a biasing body for biasing the
The lateral periphery of the valve body or the lateral periphery of the valve body where the lateral periphery of the valve body on the elevating member does not point contact between points where the lateral portions of the valve body press against the plurality of ridges and make point contact The surface formed by connecting the center of the valve body and the outer periphery in the lateral direction is extended outward, with the outer peripheral portion not in line contact between the portions where the outer periphery presses against the inner surface and makes line contact. Of the first air passage or the center of the valve body which is a cut of the first air passage obtained by cutting the inner surface forming the first air passage and the convex portions on both sides of the inner surface And a second communication port, which is a cut port of the second air passage, obtained by cutting the surface for forming the recess forming the second air passage with a surface extending outward, which is a surface formed by connecting with the outer periphery of the second air passage. Make up the valve
A state in which the lateral periphery of the valve body on the elevating member is in point contact with the plurality of ridges by pressing against the plurality of ridges, or the lateral periphery of the valve body on the elevating member is the cylinder main body In the state in which the fuel in the fuel tank is in line contact with the inner surface of the fuel tank, the pressure in the fuel tank is increased by vaporized gas from the fuel in the fuel tank, and a portion or a line A first passage resistance or a second passage resistance set by the size of the area of the valve portion constituted by the portion of the outer periphery not in contact with the lateral direction and the first communication port or the second communication port and the valve When the pressure reaches a predetermined value set by the magnitude of the biasing force of the biasing body which is equal to or more than the total weight of the body and the elevating member, the pressure in the first air passage or against the first passage resistance. In the second air passage against the second passage resistance, the The chemical gas rises, passes through the valve portion, and the rising vaporized gas lowers the valve body and the elevating member against the biasing force of the biasing body to open the valve portion. The fuel tank cap according to claim 1, wherein the excessive pressure in the fuel tank is released to the outside of the fuel tank through the first space, the second space, and the opening. An air passage for connecting the inside and the outside of the fuel tank and a valve mechanism portion provided in the air passage are provided in a cap body attached to a fuel supply port of the fuel tank and including an outer lid and an inner lid. A fuel tank filler cap that
The valve mechanism unit
A cylindrical first space provided at a substantially central position on the inner surface side of the inner lid and communicating with the inside of the fuel tank, a second space having a frusto-conical shape communicating with the first space from above, and the second space And an opening communicating with the outside of the fuel tank is formed in the upper surface, and a plurality of strips extending inward in the vertical direction and spaced apart at the first inner side surface forming the second space. The second air passage is formed by forming a plurality of concave portions which are long in the vertical direction and spaced from each other in the first air passage or the first inner side surface formed between the respective convex portions. A cylinder main body on which the
A bottomed hollow cylindrical shape having an upper surface and an open lower surface is formed to form a space inside, and a large diameter portion of a lower portion stored in the first space and an outer shape stored in the second space are conical A lifting member comprising a trapezoidal upper portion and a small diameter portion;
The outer periphery is point-contacted with the plurality of ridges projecting on the first inner side surface of the cylinder main body which is placed on the upper surface of the small diameter portion of the elevating member and which forms the second space A spherical valve body whose outer periphery in the lateral direction is in line contact with the first inner side surface of the cylinder main body forming the second space;
It arranges in the space of the raising and lowering member, pushes up the raising and lowering member, and presses the outer periphery of the lateral direction of the valve mounted on the small diameter portion against the plurality of ridges to make a point contact Of the valve body placed on the small diameter portion by pressing the lifting member so as to press the outer periphery of the valve body placed on the small diameter portion into line contact with the first inner side surface of the cylinder main body A coil spring to bias the
A small diameter portion loosely inserted in the coil spring housed in the space of the elevating member and in which a small diameter space is formed, and a step for supporting the lower portion of the coil spring on the upper surface with a diameter larger than the small diameter portion A blow-up member having a hollow cylindrical shape, and a large-diameter portion having a diameter larger than that of the step portion and in which a large-diameter space communicating with the small-diameter space is formed;
The lower part of the blowup member has a communication port communicating with the small diameter space and the fuel tank, and has a circular shape in a plan view, for reducing the pressure of vaporized gas or fuel from the fuel tank. And a cylindrical upper portion provided upright at the upper central portion of the lower portion, the upper peripheral portion of the lower portion being in contact with the lower surface of the step portion of the blow-up member; The lower portion is housed, and the upper portion comprises a resistance member housed in the small diameter space in a state separated from the second inner side surface forming the small diameter space of the blowing-up member,
The lateral periphery of the valve body or the lateral periphery of the valve body where the lateral periphery of the valve body on the elevating member does not point contact between points where the lateral portions of the valve body press against the plurality of ridges and make point contact The outer periphery is a portion formed by connecting the center of the valve body and the outer periphery in the lateral direction to the outside, with the outer peripheral portion in the lateral direction not contacting the line between the portions where the outer periphery presses against the first inner surface and makes line contact A first communication port or the valve body which is a cut port of the first air passage obtained by cutting the first inner side surface forming the first air passage and the convex portions on both sides of the first inner side surface And a cut surface of the second air passage obtained by cutting the surface for forming the concave portion forming the second air passage with a surface extending outward from the surface formed by connecting the center of the frame and the outer periphery in the lateral direction. The second communication port and a valve unit
A state in which the lateral periphery of the valve body on the elevating member is in point contact with the plurality of ridges by pressing against the plurality of ridges, or the lateral periphery of the valve body on the elevating member is the cylinder main body The pressure in the fuel tank is increased by the vaporized gas from which the fuel in the fuel tank has evaporated or the expanded fuel in a state of being in line contact with the first inner side face of the A first passage resistance set by the size of the area of the valve portion configured by the portion of the outer periphery in the lateral direction or the portion of the outer periphery in the lateral direction not in line contact and the first communication port or the second communication port Alternatively, when the pressure of the predetermined value set by the second passage resistance and the magnitude of the biasing force of the coil spring greater than the total weight of the valve body and the elevating member is reached, the communication port of the resistance member, the blowup Small diameter space of the member, in front A gap between the lower end of the lifting member and the large diameter portion of the blowing member and a gap between the lifting member and the cylinder main body against the first passage resistance in the first air passage or the second passage resistance The vaporized gas or the expanded fuel rises in the second air passage against the pressure, passes through the valve portion, and the rising vaporized gas or the expanded fuel is applied to the biasing force of the coil spring. The valve body and the raising and lowering member are lowered against this, and the valve part is opened to open the excessive pressure in the fuel tank to the outside of the fuel tank via the first space, the second space and the opening. A fuel tank filler cap characterized in that it is released into the tank. An air passage for connecting the inside and the outside of the fuel tank and a valve mechanism portion provided in the air passage are provided in a cap body attached to a fuel supply port of the fuel tank and including an outer lid and an inner lid. A fuel tank filler cap that
The valve mechanism unit
A cylindrical first space provided at a substantially central position on the inner surface side of the inner lid and communicating with the inside of the fuel tank, a second space having a frusto-conical shape communicating with the first space from above, and the second space And an opening communicating with the outside of the fuel tank is formed in the upper surface, and a plurality of projections projecting inward at a distance from the upper surface in the vertical direction are formed on the inner side surface forming the second space. A second air passage is formed by forming a plurality of concave portions which are long in the vertical direction and spaced apart in the first air passage or the inner side surface which is formed between the convex portions by forming a portion. The tube body,
A bottomed hollow cylindrical shape having an upper surface and an open lower surface is formed to form a space inside, and a large diameter portion of a lower portion stored in the first space and an outer shape stored in the second space are conical A lifting member comprising a trapezoidal upper portion and a small diameter portion;
A state in which the outer periphery in the lateral direction can point-contact the plurality of ridges projecting on the inner side surface of the cylinder main body forming the second space, or the inner side surface of the cylinder main body forming the second space A spherical valve body mounted on the upper surface of the small diameter portion of the elevating member in a state where the outer periphery in the lateral direction can make line contact;
The outer periphery of the valve body placed on the small diameter portion is pushed against the plurality of ridges by pushing up the elevation member so that point contact can be performed or the small diameter portion is pushed up so that the elevation member can be raised. A coil spring disposed in the space of the elevating member so that the lateral outer periphery of the valve body placed on the upper side can be pressed against the inner side surface of the cylinder main body to be in line contact;
A small diameter portion loosely inserted in the coil spring housed in the space of the elevating member and in which a small diameter space is formed, and a step for supporting the lower portion of the coil spring on the upper surface with a diameter larger than the small diameter portion And a large diameter portion having a diameter larger than that of the step portion and forming a large diameter space communicating with the small diameter space and housed in the space formed on the bottom wall of the inner lid; A blowing member that exhibits
The bottom surface of the inner lid has a circular shape in plan view and includes a communication port communicating with the large diameter space of the blow-up member and the fuel tank, and in contact with the lower surface of the large-diameter portion of the blow-up member And a resistance member housed in the space formed on the wall,
The lateral periphery of the valve body or the lateral periphery of the valve body where the lateral periphery of the valve body on the elevating member does not point contact between points where the lateral portions of the valve body press against the plurality of ridges and make point contact The surface formed by connecting the center of the valve body and the outer periphery in the lateral direction is extended outward, with the outer peripheral portion not in line contact between the portions where the outer periphery presses against the inner surface and makes line contact. Of the first air passage or the center of the valve body which is a cut of the first air passage obtained by cutting the inner surface forming the first air passage and the convex portions on both sides of the inner surface And a second communication port, which is a cut port of the second air passage, obtained by cutting the surface for forming the recess forming the second air passage with a surface extending outward, which is a surface formed by connecting with the outer periphery of the second air passage. Make up the valve
When the coil spring is compressed with an urging force less than the total weight of the valve body and the elevating member, the elevating member and the valve body are lowered, and the lateral direction of the valve body on the elevating member The valve portion is not in point contact with a plurality of ridges of the outer peripheral portion or the lateral periphery of the valve body on the elevating member is not in line contact with the inner side surface of the cylinder main body In the open state, when the fuel tank is inclined, the weight applied to the coil spring of the elevating member and the valve body is reduced according to the inclination angle, and the coil spring is extended in length When the valve body reaches a predetermined length, the valve body contacts the convex portion of the inner side surface of the cylinder main body or contacts the inner side surface, and the fuel is depressurized at the communication port of the resistance member. And the blow-up member A fuel tank characterized by spouting from the radial space into the space of the elevating member and pushing up the elevating member and the valve body together with the biasing force of the coil spring to close the valve portion. 'S filler cap.