JP5421463B2 - Valve device - Google Patents

Description

  The present invention relates to a valve device that is attached to a fuel tank of an automobile or the like and can adjust the pressure in the fuel tank, and can perform external leakage of fuel and full tank control of fuel supply fuel.

  For example, in a fuel tank of a car, when the car turns or tilts, a cut valve that prevents liquid fuel in the fuel tank from leaking out of the fuel tank or when the pressure in the fuel tank rises In addition, while preventing the fuel tank from rupturing by discharging the fuel vapor to the outside, when the pressure in the fuel tank decreases, a check valve that prevents the fuel tank from collapsing by allowing outside air to flow in from the outside of the fuel tank, Furthermore, a full tank regulating valve or the like for stopping the refueling at the upper limit value of the refueling amount during refueling is attached. These valves may be provided separately. For example, a valve in which a cut valve and a check valve are integrated is also used.

  For example, in the following Patent Document 1, a float case is accommodated, a main body case in which a vent hole that is opened and closed by the float valve is formed in an upper wall, and a top case of the main body case are fitted and communicated with the vent hole. An upper case in which a connecting pipe protrudes from the outer wall, a cylindrical portion standing on the outer periphery of the vent hole on the upper wall of the main body case, and having an engagement piece on the upper edge, and vertically moved to the inner periphery of the cylindrical portion A check valve arranged in a possible manner, a cap whose outer periphery engages with an engagement piece of the cylindrical portion, and which is attached to the upper end of the cylindrical portion; A first spring that abuts and biases the check valve toward the vent of the upper wall, and the engagement piece is enlarged by a predetermined diameter or more by the inner periphery of the upper case. The cap is engaged with the engagement piece Check valved cut valve, characterized in that it is held so as not come off al is disclosed.

  The check valve introduces outside air when the pressure in the fuel tank rises above a predetermined value, and a positive pressure valve that discharges fuel vapor to the outside, and when the pressure in the fuel tank falls below the predetermined value. And a negative pressure valve. The positive pressure valve has a cylindrical body having a structure in which a hole is provided in the center of the lower surface and the upper surface forms a receiving surface for receiving the lower end of the first spring, and an opening is provided in the center. The main body is disposed inside the main body, biased upward via a second spring, and is disposed so as to normally close the opening of the main body.

  In this check valve-integrated cut valve, when the pressure in the fuel tank rises and becomes higher than the external pressure by a predetermined value or more, the entire check valve rises against the urging force of the first spring and the vent hole opens. The fuel vapor in the fuel tank enters the upper case through the vent hole, and is sent to the canister through the connection pipe. Further, when the pressure in the fuel tank decreases and becomes lower than a predetermined value with respect to the external pressure, the negative pressure valve descends against the second spring and the opening of the main body of the positive pressure valve opens. Outside air that flows into the case flows into the inside of the main body of the positive pressure valve and flows into the fuel tank through the hole on the lower surface and the vent hole of the main body case. In this way, the pressure in the fuel tank is prevented from increasing beyond a predetermined value or decreasing beyond the predetermined value.

Japanese Patent No. 4017587

  However, the valve device of Patent Document 1 has the following problems. This will be described with reference to a graph showing the relationship between the pressure and the flow rate in the valve device shown in FIG. The vertical axis in the figure represents the flow rate of the gas flowing out from the inside of the fuel tank, and when this is positive, it means that the gas inside the fuel tank is flowing out, and when this is negative, It means that gas flows into the fuel tank from the outside. The horizontal axis represents the pressure in the fuel tank. If this is positive, the pressure in the fuel tank is higher than the external pressure. If this is negative, the pressure in the fuel tank is lower than the external pressure. Represents.

  As shown in FIG. 11, in the valve device of Patent Document 1, when the pressure in the fuel tank is higher than the external air pressure by a predetermined value (X1 + X2) or more, a check is performed against the urging force of the first spring. The entire valve rises and the vent hole opens, so that fuel vapor or the like in the fuel tank flows out to the outside. Further, when the pressure in the fuel tank becomes lower than a predetermined value (Xa) with respect to the outside air pressure, the negative pressure valve descends against the second spring, and the outside air flows into the fuel tank.

  For this reason, while the pressure in the fuel tank is lower than the external pressure by a predetermined value (Xa) to higher than the external pressure by a predetermined value (X1 + X2), the check valve is closed and the gas flows out. In some cases, the fuel tank is continuously maintained in a slightly negative pressure state or a slightly pressurized state with respect to the external air pressure. As a result, a constant load is applied to the fuel tank, which shortens its life.

  Accordingly, an object of the present invention is to prevent the fuel tank from being continuously maintained in a slightly negative pressure state with respect to the external air pressure, or in a state where a predetermined pressure is applied (positive pressure state). Thus, an object of the present invention is to provide a valve device that can prevent deterioration of the fuel tank.

  In order to achieve the above object, the valve device of the present invention accommodates a float valve, and has a first through hole formed in the upper wall that is opened and closed by the float valve, and is erected on the outer periphery of the first through hole of the upper wall. A main body case having a cylindrical tube portion, a joint member that is joined to the upper portion of the main body case and communicates with the first through-hole, and is protruded from the outer wall; and is accommodated in the tube portion. A pressure regulating valve disposed in the first through hole so as to be able to contact and separate from above, and urged in a direction to close the first through hole by a spring disposed at an upper portion, the pressure regulating valve being An outer case having a peripheral edge portion that opens and closes to the first through-hole and a second through-hole formed therein, and a ceiling wall that is fixed to an upper opening portion of the outer case; It has a peripheral wall extending downward from the ceiling wall inner surface, and the ceiling wall A third through hole is formed on the inner side of the wall, a fourth through hole is formed in the peripheral wall, a support plate attached to the lower surface of the peripheral wall of the inner case, and the inner case in the inner case. It is accommodated between the auxiliary valve body that is slidable up and down so as to be in contact with and away from the three through holes, and is normally supported on the support plate by its own weight, and the peripheral wall of the outer case and the peripheral wall of the inner case. In addition, it has a flow path for communicating the second through hole of the outer case and the fourth through hole of the inner case.

  In the valve device of the present invention, it is preferable that a rib for supporting the auxiliary valve body in a state of floating from the upper surface of the support plate is formed on the upper surface of the support plate.

  In the valve device of the present invention, the ribs of the support plate extend radially from the center of the support plate, and the gap between the adjacent ribs is arranged so as to be aligned with the fourth through hole of the inner case. It is preferable that

  In the valve device of the present invention, it is preferable that a portion of the rib of the support plate located at the center of the support plate protrudes at a predetermined height.

  In the valve device of the present invention, it is preferable that a plurality of protrusions are formed on the auxiliary valve body toward the support plate.

  According to the present invention, when the fuel in the fuel tank rises, the float valve floats, and when the fuel level exceeds a predetermined height, the float valve closes the first through hole and the liquid fuel passes through the first through hole. To prevent the liquid fuel from leaking out of the fuel tank.

  Further, when the fuel level in the fuel tank is in the normal state, the float valve is lowered and is separated from the first through hole. At this time, the pressure regulating valve is biased by the spring and closes the first through hole, but the inside of the fuel tank is a joint member through the second through hole, the fourth through hole, and the third through hole. It communicates with the inside. For this reason, when the fuel tank is less than a predetermined positive pressure, fuel vapor or the like enters the joint member through the second through hole, the fourth through hole and the third through hole of the pressure regulating valve, and is connected through the connecting pipe. It is sent to the canister through a steam pipe connected to the pipe. For this reason, it can prevent that a pressure is continuously added to a fuel tank, and can suppress deterioration of a fuel tank.

  On the other hand, when the pressure in the fuel tank further increases, fuel vapor or the like is blown into the inner case through the second and fourth through holes of the pressure regulating valve, so that the auxiliary valve body accommodated in the inner case Rises and closes the third hole. As a result, the first through hole is temporarily completely closed by the pressure regulating valve. Due to this temporarily closed state, for example, when the tank is full during refueling, the pressure in the fuel tank can be raised, and the fuel can be raised in the refueling pipe to perform full tank regulation.

  Further, in this valve device, since the support plate is mounted on the lower surface of the peripheral wall of the inner case, the fuel vapor or the like flowing from the second through hole of the outer case collides with the support plate and can weaken its momentum. After that, it flows into the inner case through the fourth through hole and is not directly blown onto the lower surface of the auxiliary valve body. For example, fuel vapor or the like is instantaneously blown from the second through hole. However, the sensitive reaction of the auxiliary valve element is suppressed, and the auxiliary valve element can be moved up and down stably.

  When the pressure in the fuel tank further rises, the entire pressure regulating valve rises against the urging force of the spring, and the gap between the first through hole and the peripheral edge of the pressure regulating valve opens. Flows into the joint member and is discharged to the outside through the connecting pipe. As a result, it is possible to prevent the pressure in the fuel tank from rising excessively and damaging the fuel tank.

  On the other hand, when the pressure in the fuel tank is reduced with respect to the external pressure, the auxiliary valve body is lowered by its own weight, and the third through hole is opened. It is possible to prevent outside air from flowing into the fuel tank through the three through holes, the fourth through hole, the second through hole, and the first through hole, and maintaining the fuel tank in a negative pressure state. For this reason, it can prevent that the inside of a fuel tank is maintained under a negative pressure state for a long time, and can suppress degradation of a fuel tank. Further, it is possible to eliminate the possibility that the fuel tank becomes a strong negative pressure and the fuel tank is recessed.

  In the state where the auxiliary valve body is lifted and the third through hole is closed and the pressure regulating valve is not lifted, the first through hole is completely closed by the pressure regulating valve. In general, it does not last so long, and when the pressure is further increased, the pressure adjustment valve floats against the urging force of the spring, and a large amount of fuel vapor or the like flows into the joint member, or the pressure drops and the auxiliary valve body The fuel tank returns to a state where it is communicated with the joint member through the second through hole, the fourth through hole, and the third through hole, so that a predetermined pressure is applied (positive pressure state), It can be prevented from being continuously maintained for a long time.

It is a disassembled perspective view which shows one Embodiment of the valve apparatus which concerns on this invention. (A) is a disassembled perspective view of the pressure regulating valve of the valve device, (b) is a perspective view of the pressure regulating valve of the valve device. It is a section perspective view in the state where a part of same pressure regulation valve was fractured. FIG. 5 is a perspective cross-sectional view of the same pressure regulating valve with the outer case broken. It is sectional drawing which shows the shape of the auxiliary valve body and support plate in the valve apparatus. It is a side view of an inner case and a support plate of the pressure regulating valve. It is sectional drawing of the valve apparatus. FIG. 4 is a partial cross-sectional view of the valve device in a state where the inside of the fuel tank is less than a predetermined positive pressure or in a negative pressure state. FIG. 5 is a partial cross-sectional view of the valve device in a state where the fuel tank has a predetermined positive pressure and the auxiliary valve body is raised. FIG. 10 is a partial cross-sectional view of the valve device in a state in which the pressure in the fuel tank is higher than that in the case shown in FIG. It is a graph which shows the relationship between the pressure and flow volume in the valve apparatus which concerns on this invention, and the conventional valve apparatus. In the same valve device, it is a sectional view showing other shapes of an auxiliary valve body and a support plate.

  Hereinafter, an embodiment of a valve device of the present invention will be described with reference to the drawings. In this embodiment, the present invention is applied to a check valve integrated cut valve in which a cut valve for preventing leakage of fuel to the outside of the fuel tank and a check valve for adjusting the pressure in the fuel tank are integrated. is there. The present invention can also be applied to a valve device in which a full tank regulating valve and a check valve are integrated.

  As shown in FIG. 1, the valve device 10 includes a main body case 20, a float valve 30 accommodated in the main body case 20, a float valve spring 35 that urges the float valve 30 upward, and a main body. A bottom case 40 mounted on the lower surface of the case 20, a joint member 100 joined to the upper part of the main body case 20, a pressure regulating valve 50 disposed in the joint member 100, and the pressure regulating valve urged downward And a regulating valve spring 58. The adjusting valve spring 58 constitutes a “spring” in the present invention.

  Referring also to FIG. 7, the main body case 20 has a cylindrical peripheral wall 21 and an upper wall 23 that closes the upper side thereof. A first through hole 23a is formed at the center of the upper wall 23, and a valve seat 23b to which the valve head 31 of the float valve 30 contacts and separates is formed at the periphery of the lower surface thereof.

  A cylindrical tube portion 27 is erected on the upper surface of the upper wall 23 and on the outer periphery of the first through hole 23a. A total of four engaging pieces 27 a are provided upright at predetermined intervals on the upper end portion of the cylindrical portion 27, two facing each other in the circumferential direction. In addition, a flange portion 26 is provided on the outer periphery of the upper wall 23, and a plurality of insertion holes 23c are formed at predetermined locations along the circumferential direction of the base portion of the flange portion 26, corresponding to the lower portion of the insertion hole 23c. On the outer periphery of the peripheral wall 21, an engaging claw 21a is formed. An annular wall 29 protrudes from the upper surface of the upper wall 23 on the outer periphery of the cylindrical portion 27 via an annular groove 28 (see FIG. 7). Further, engaging claws 21b are formed on the outer periphery of the lower portion of the peripheral wall 21 at predetermined intervals along the circumferential direction.

  The bottom case 40 has a peripheral wall 41 and a bottom wall 42. The upper end of the peripheral wall 41 is slightly enlarged in diameter, and engagement holes 41a are formed at predetermined intervals along the circumferential direction at the base of the enlarged diameter part. ing.

  Then, the float valve 30 is placed on the bottom wall 42 of the bottom case 40 via the float valve spring 35, and the bottom case 40 is assembled to the lower outer periphery of the peripheral wall 21 of the main body case 20. The bottom case 40 is attached to the main body case 20 by fitting the joint claw 21 b into the engagement hole 41 a of the bottom case 40.

  The float valve spring 35 is compressed by its own weight, and the float valve 30 is normally in contact with the bottom wall 42 of the bottom case 40. However, the fuel in the fuel tank rises and the float valve 30 When immersed to a predetermined height, buoyancy is added to the urging force of the float valve spring 35, the float valve 30 is raised, and the first through hole 23a of the upper wall 23 of the main body case 20 is closed.

  As shown in FIGS. 1 and 7, in the cylindrical portion 27 of the main body case 20, the first through hole 23 a is disposed so as to be able to contact and separate from above, and a first adjustment valve spring 58 is disposed on the upper portion thereof. A pressure regulating valve 50 urged in a direction to close the through hole 23a is accommodated. A lid 90 is placed on the upper portion of the cylindrical portion 27 to hold down the upper end of the adjusting valve spring 58. The lid 90 has a substantially circular upper wall 91 and a peripheral wall 93 extending from the periphery of the upper wall 91, and the lower edge of the peripheral wall 93 is cut out at two opposing locations. The formed fifth through hole 93a is formed, and engaging stepped portions 93b and 93b are formed at upper corners on both sides of the fifth through hole 93a, respectively. Then, by engaging the engagement pieces 27a and 27a erected from the upper end of the tube portion 27 with the engagement step portions 93b and 93b, the lid body 90 is mounted on the upper portion of the tube portion 27. Yes. The fifth through-hole 93a is opened in a state in which the lid 90 is attached to the cylindrical portion 27 so that the inside and the outside of the cylindrical portion 27 are communicated.

  The joint member 100 joined to the upper part of the main body case 20 has a cylindrical shape in which the upper part is closed and the lower part is opened. And a plate portion 103 provided with an annular welded portion 103a welded to the periphery of the attachment hole Ta (see FIG. 7) of the fuel tank T. A connecting pipe 105 for connecting a pipe connected to a canister (not shown) protrudes from the outer periphery of the cylindrical case 101. The connecting pipe 105 communicates with the internal space of the cylindrical case 101 and also communicates with a first through hole 23 a provided in the main body case 20. Further, an annular rib 104 inserted into the annular groove 28 of the main body case 20 is formed on the lower surface of the plate portion 103. Further, a plurality of frame-like engagement pieces 103b that engage with the engagement claws 21a of the main body case 20 are provided at a predetermined interval in the circumferential direction further outward than the annular rib 104 on the lower surface of the plate portion 103. It is installed vertically.

  Then, the seal ring R is attached to the outer periphery of the annular rib 104 of the joint member 100, the annular rib 104 on the lower surface of the plate portion 103 is inserted into the annular groove 28 of the main body case 20, and the engagement piece 103b of the joint member 100 is By engaging with the engaging claw 21 a through the insertion hole 23 c of the main body case 20, the joint member 100 is attached to the upper portion of the main body case 20 via the seal ring R.

  2 to 5, the pressure regulating valve 50 includes an outer case 51, an inner case 60 attached to the outer case 51, a support plate 70 attached below the inner case 60, and the inner case 60. And an auxiliary valve body 80 accommodated therein so as to be slidable up and down.

  In particular, as shown in FIG. 5, the outer case 51 is formed on a cylindrical peripheral wall 52 that opens upward, an annular bottom surface 53 provided on the lower end surface of the peripheral wall 52, and an inner periphery of the bottom surface 53. And a cylindrical peripheral portion 54 having a second through hole 54a at the center of the lower end, and bulging downward, forming a curved surface and reducing the diameter. It is a part which contacts / separates the upper surface periphery of the hole 23a (refer FIGS. 7-10). Further, an enlarged diameter wall portion 52 a is provided on the upper outer periphery of the peripheral wall 52.

  On the other hand, the inner case 60 is disposed in the enlarged-diameter wall portion 52a of the outer case 51 and is fixed to the upper opening of the outer case 51 by welding or the like, and from the lower surface periphery of the ceiling wall 61. It has a cylindrical peripheral wall 63 extending downward. A third through hole 61a is formed in the center of the ceiling wall 61, and a lower end portion of the adjustment valve spring 58 is provided on the upper surface of the ceiling wall 61 and on the outer peripheral edge of the third through hole 61a. A spring support recess 61b for supporting is formed.

  In particular, as shown in FIGS. 3, 4, and 6, a plurality of fourth through holes 64 are formed at the lower end portion of the peripheral wall 63 with a uniform spacing in the circumferential direction. In this embodiment, four fourth through holes 64 are formed. Further, a notch-shaped fitting recess 65 is formed between the adjacent fourth through holes 64 and 64 at the lower end edge of the peripheral wall 63. In this embodiment, four fitting recesses 65 are formed at equal intervals in the circumferential direction at the lower end edge of the peripheral wall 63 corresponding to the four fourth through holes 64. Further, an insertion hole 66 is formed above and aligned with the fitting recess 65 of the peripheral wall 63. Further, protrusions 67 extending in the axial direction are provided on the inner surface of the peripheral wall 63 at equal intervals in the circumferential direction, and serve as a guide for vertical sliding of the auxiliary valve body 80.

  A support plate 70 is attached to the lower surface of the peripheral wall 63 of the inner case 60. As shown in FIGS. 2 and 3, the support plate 70 is formed in a disc shape and is provided upright on a closing portion 71 that closes a lower opening portion of the peripheral wall 63 and an upper surface 71 a of the closing portion 71. And a rib 74 for supporting the body 80 in a floating state. In this embodiment, the ribs 74 are formed to extend radially from the center of the closing portion 71 outward at an equal angle, and have a substantially cross shape as a whole. The radial tip 74a of the rib 74 reaches the outer peripheral edge of the closing part 71 and widens along the circumferential direction of the closing part 71, and the insertion claw 75 extends from the tip 74a to the outside of the closing part 71. Each protrudes. A support claw 76 protruding from the outer peripheral edge of the closing part 71 is provided on the lower surface of the closing part 71 at a position aligned with the insertion claw 75 with a uniform spacing in the circumferential direction. Further, a cross-shaped projecting portion 77 is formed at a predetermined height on a portion of the radially formed rib 74 located at the center of the support plate 70.

  Then, the auxiliary valve body 80 is inserted into the inner case 60, the support plate 70 is disposed on the lower surface of the inner case 60, and the support plate 70 is pushed in while expanding the peripheral wall 63 of the inner case 60. The support plate 70 is mounted below the inner case 60 by being inserted into the insertion hole 66 of the inner case 60 and inserting the support claw 76 into the fitting recess 65 of the inner case 60. At this time, the gap S between the adjacent ribs 74 and 74 is arranged in alignment with the fourth through hole 64 of the inner case 60 (see FIGS. 2 and 3), and the inner and outer sides of the inner case 60 define the fourth through hole 64. It is designed to communicate with each other (see FIG. 8).

  In this embodiment, the four ribs 74 are provided radially. For example, three ribs 74 may be provided radially, five or more ribs 74 may be provided radially, and a plurality of ribs 74 may be provided. The ribs 74 may be arranged vertically and horizontally to form a lattice, and various forms can be adopted.

  The auxiliary valve body 80 is accommodated in the inner case 60 so as to be vertically slidable so as to be in contact with and away from the third through hole 61a, and is always supported on the support plate 70 by its own weight. In the case of this embodiment, the auxiliary valve body 80 has a cylindrical shape in which the lower part is opened and the upper part is substantially spherical and closed. Specifically, the disc-shaped head 81 and the contact / separation portion that expands in a spherical shape downward from the periphery of the head 81 and contacts and separates from the inner periphery of the third through hole 61a. 83 and a cylindrical body portion 85 that hangs downward from the periphery of the contact / separation portion 83.

  When the auxiliary valve body 80 is placed on the support plate 70 by its own weight, the auxiliary valve body 80 abuts on the rib 74 of the support plate 70 and is supported in a state of floating from the upper surface 71a of the support plate 70. A gas inflow space is formed between the support plate 70 and the support plate 70 (see FIG. 8). When the inside of the fuel tank T is less than a predetermined positive pressure, the auxiliary valve body 80 is lowered by its own weight to open the third through hole 61a (see FIG. 8), and the pressure in the fuel tank T is increased. When fuel vapor or the like is blown into the case 60 at a predetermined pressure, it floats up, and the contact / separation portion 83 comes into contact with the inner peripheral edge of the third through hole 61a to close the third through hole 61a ( (See FIG. 9). Further, when the pressure inside the fuel tank T is negative from the external pressure, the auxiliary valve body 80 is maintained in a state where it is pressed by the external pressure and the third through hole 61a is opened (FIG. 8). reference).

  The auxiliary valve body 80 is not limited to the above shape, and may be a hemispherical shape, a conical shape, a circular plate shape, or the like. Further, in this embodiment, a rib 74 is provided on the support plate 70 side that supports the auxiliary valve body 80 to support the auxiliary valve body 80 in a floating state. However, as shown in FIG. A plurality of protrusions 87 extending toward the support plate 70a at equal intervals in the circumferential direction from the outer periphery of the lower end of 80a may be provided and supported in a state of floating from the upper surface of the support plate 70a. In this case, the rib 74 is not necessary for the support plate 70a.

  As described above, the inner case 60 is fixed to the upper opening of the outer case 51 by welding or the like, with the ceiling wall 61 disposed in the enlarged-diameter wall portion 52a of the outer case 51. In this state, a flow path 68 is formed between the peripheral wall 63 of the inner case 60 and the inner periphery of the outer case 51. The flow path 68 communicates with a second through hole 54 a formed in the lower surface of the outer case 51 and communicates with a fourth through hole 64 formed in the peripheral wall of the inner case 60.

  As described above, the pressure regulating valve 50 is accommodated in the cylindrical portion 27 of the main body case 20 so as to be vertically slidable, and is disposed in the first through hole 23a of the main body case 20 so as to be able to contact and separate from above. The adjustment valve spring 58 disposed on the upper side is biased in a direction to close the first through hole 23a.

  Next, with reference to FIGS. 7-11, the effect of the valve apparatus 10 of this invention which consists of the said structure is demonstrated.

  As shown in FIG. 7, the valve device 10 has a lower half portion inserted into the mounting hole Ta of the fuel tank T, and an annular welded portion 103 a of the joint member 100 is welded to the front side periphery of the mounting hole Ta. , Attached to the fuel tank T.

  When the fuel level rises by turning the automobile or the like and the liquid fuel is immersed in the float valve 30 at a predetermined height, the float is generated by the urging force of the float valve spring 35 and the buoyancy generated in the float valve 30 itself. The valve 30 is lifted, the valve head 31 comes into contact with the inner peripheral edge of the valve seat 23b of the main body case 20, closes the first through hole 23a, and the liquid fuel enters the joint member 100 from the first through hole 23a. This prevents the liquid fuel from leaking outside the fuel tank T.

  On the other hand, as shown in FIGS. 7 and 8, when the liquid level of the liquid fuel in the fuel tank T is in the normal state, the float valve 30 is lowered, the valve head 31 is separated from the valve seat 23b, and the first passage is made. The hole 23a is open. At this time, the pressure regulating valve 50 is biased by the regulating valve spring 58 and closes the first through hole 23a, but the second through hole 54a of the outer case 51 and the peripheral wall 52 of the outer case 51 are closed. And the flow path 68 between the peripheral walls 63 of the inner case 60, the fourth through hole 64 of the inner case 60, the third through hole 61a of the inner case 60, and the fifth through hole 93a of the lid 90 (see FIG. 1). The fuel tank T is in communication with the joint member 100.

  Therefore, first, referring to the graph showing the relationship between the pressure and the flow rate in the valve device shown in FIG. 11, the operation while the pressure in the fuel tank T rises by X1 from the external pressure will be described. Then, the auxiliary valve body 80 of the pressure regulating valve 50 is placed on the support plate 70 by its own weight, and the third through hole 61a is opened. For this reason, as shown in FIG. 8, the fuel vapor in the fuel tank T flows into the inner case 60 from the fourth through hole 64 through the second through hole 54 a and the flow path 68. The fuel vapor flowing into the inner case 60 flows out from the third through hole 61a through the inner case 60 inner surface and the outer periphery of the auxiliary valve body 80 (the gap between the protrusions 67 shown in FIG. 5). Further, it flows into the joint member 100 through the fifth through hole 93a, and is sent to the canister through the connection pipe 105 and the steam pipe. For this reason, when the inside of the fuel tank T is less than a predetermined positive pressure, it is possible to prevent the pressure from being continuously applied to the fuel tank T, and to suppress the deterioration of the fuel tank T.

  In this valve device 10, since the support plate 70 is mounted on the lower surface of the peripheral wall 63 of the inner case 60, the fuel vapor flowing from the second through hole 54 a of the outer case 51 is blocked by the closed portion of the support plate 70. After colliding with 71 and weakening its momentum, the inner case 60 passes through the flow path 68 between the outer case 51 and the inner case 60 and passes through the fourth through hole 64 provided in the peripheral wall 63 of the inner case 60. (See FIG. 8). As a result, since fuel vapor or the like is not directly sprayed on the lower surface of the auxiliary valve body 80, it is possible to prevent the auxiliary valve body 80 from reacting sensitively by the fuel vapor or the like. Even if it blows in vigorously from the second through hole 54a, it is possible to prevent the auxiliary valve body 80 from rising immediately, and to stabilize the ascending / descending operation of the auxiliary valve body 80.

  Next, in FIG. 11, the operation in a state where the pressure in the fuel tank T is higher than X1 and lower than X1 + X2 with respect to the external air pressure will be described. In this state, fuel vapor or the like enters the inner case 60. Since it flows in vigorously, it flows through the gap S between the ribs 74, 74, proceeds toward the center of the inner case 60, collides with the base side surface of the rib 74 located forward in the traveling direction, and the flow direction changes. It turns upward (see FIG. 8). For this reason, since fuel vapor or the like enters upward from below the auxiliary valve body 80, the auxiliary valve body 80 rises and closes the third through hole 61a as shown in FIG. However, the pressure in the fuel tank T has not reached the point where the adjustment valve spring 58 is compressed and the pressure adjustment valve 50 as a whole is pushed up. For this reason, the first through hole 23a of the main body case 20 is closed, and the inside of the fuel tank T is closed.

  In the present invention, it is preferable that the pressure in the fuel tank T in this state is set so as to be a pressure required for performing fuel full tank regulation at the time of refueling. That is, when the fuel is full during refueling and the pressure in the fuel tank T rises, the fuel tank T is completely closed by being in the above state that is higher than X1 and lower than X1 + X2 with respect to the outside air pressure. Thus, full tank regulation can be performed reliably.

  In this case, the auxiliary valve body 80 is supported by the rib 74 provided on the upper surface 71a of the closing portion 71 of the support plate 70 so as to float from the upper surface 71a. It is possible to easily introduce the fuel vapor flowing into the auxiliary valve body 80 between the support plate 70 and the responsiveness when the auxiliary valve body 80 operates. Further, by adjusting the height of the rib 74, the support height of the auxiliary valve body 80 can be deformed, and the closing timing of the third through hole 61a can be adjusted as appropriate.

  In addition, as shown in FIG. 12, even when a plurality of protrusions 87 are provided on the auxiliary valve body 80 a side, the auxiliary valve body 80 can be supported in a state of floating from the support plate 70, and the fourth through hole 64. The fuel vapor flowing into the inner case 60 from the inside can be introduced between the auxiliary valve body 80a and the support plate 70, and the responsiveness during operation of the auxiliary valve body 80a can be enhanced. Further, by adjusting the height of the protrusion 87, the support height of the auxiliary valve body 80a can be changed, and thereby the closing timing of the third through hole 61a can be adjusted.

  Further, the ribs 74 on the upper surface of the support plate 70 extend radially from the center of the support plate 70 and are arranged so that the gap S between the adjacent ribs 74 and the ribs is aligned with the fourth through hole 64 of the inner case 60. As a result (see FIGS. 2 to 4), the fuel vapor flowing into the inner case 60 from the fourth through hole 64 collides with the radial ribs 74, and the flow direction of the fuel vapor is effective toward the auxiliary valve body 80. Therefore, the responsiveness of the auxiliary valve body 80 can be further improved.

  Furthermore, since the protrusion 77 protrudes at a predetermined height from the portion of the rib 74 of the support plate 70 located at the center of the support plate 70, the height of the rib 74 at the portion where the fuel vapor collides is increased. The flow direction of the fuel vapor flowing into the inner case 60 can be more reliably changed to the auxiliary valve body side. Furthermore, when the lower surface of the auxiliary valve body 80 has a concave shape as in this embodiment, the protrusion 77 of the rib 74 enters the inside thereof to guide the vertical slide operation of the auxiliary valve body 80. be able to.

  Next, in FIG. 11, the operation in a state where the pressure in the fuel tank T is in the state of X1 + X2 + X3, which is higher than X1 + X2 with respect to the external air pressure, will be described. In this state, as shown in FIG. The pressure in the fuel tank T surpasses the urging force of the adjustment valve spring 58 and the weight of the pressure adjustment valve 50, and the entire pressure adjustment valve 50 is pushed up. Therefore, the first through hole 23a of the main body case 20 is opened, and a large amount of fuel vapor or the like in the fuel tank T flows into the joint member 100 and is sent to a canister or the like (not shown) through the connection pipe 105. Therefore, the pressure in the fuel tank T can be quickly reduced to prevent the fuel tank T from being damaged by the high pressure.

  On the other hand, in FIG. 11, the operation when the pressure in the fuel tank T is lower than the external air pressure and becomes the state of X4 will be described. At this time, the auxiliary valve body 80 is placed on the support plate 70 by its own weight. Then, as shown in FIG. 8, the third through hole 61a is opened. For this reason, the outside air introduced through the canister or the like passes from the connection pipe 105 through the joint member 100, through the through hole 93a of the lid 90, and from the third through hole 61a to the inner surface of the inner case 60 and the auxiliary valve body 80. It passes between the outer peripheries (gap between the ridges 67 shown in FIG. 5), passes through the fourth through hole 64, the flow path 68, the second through hole 54a, and flows into the fuel tank T. For this reason, the negative pressure in the fuel tank T is quickly eliminated, and a slight negative pressure continues to exist in the fuel tank T to prevent the fuel tank T from being loaded, thereby suppressing deterioration of the fuel tank T. can do.

  In FIG. 11, when the pressure in the fuel tank T is higher than X1 and lower than X1 + X2 with respect to the outside air pressure, the first through hole 23a of the main body case 20 is closed and the fuel tank T is closed. However, such a state generally does not last so long, and is further pressurized so that the pressure in the fuel tank T becomes X1 + X2 + X3, and the pressure regulating valve 50 resists the urging force of the spring 58. Then, a large amount of fuel vapor or the like flows out into the joint member 100 or the pressure is reduced to be less than X1 with respect to the external air pressure, the auxiliary valve body 80 is lowered, and the second through hole 54a, Since the fuel vapor in the fuel tank flows out into the joint member 100 through the flow path 68, the fourth through hole 64, and the third through hole 61a, it remains in a state where a predetermined pressure is applied (positive pressure state). Time continuously It can be prevented from being equity.

DESCRIPTION OF SYMBOLS 10 Valve apparatus 20 Main body case 23 Upper wall 23a 1st through-hole 27 Cylindrical part 30 Float valve 50 Pressure adjustment valve 51 Outer case 52 Perimeter wall 53 Bottom face 54 Peripheral part 54a Second through-hole 58 Adjustment valve spring (spring)
60 Inner case 61 Ceiling wall 61a 3rd through-hole 63 Peripheral wall 64 4th through-hole 68 Flow path 70, 70a Support plate 74 Rib 77 Protruding part 80, 80a Auxiliary valve body 100 Joint member 105 Connection pipe

Claims (5)

A main body case that houses the float valve, has a first cylindrical hole that is opened and closed by the float valve on the upper wall, and has a cylindrical tube portion that is erected on the outer periphery of the first through hole of the upper wall;
A joint member joined to the upper portion of the main body case, and a connection pipe communicating with the first through hole projecting from the outer wall;
A pressure regulating valve accommodated in the cylindrical portion, arranged to be able to contact and separate from above the first through hole, and urged in a direction to close the first through hole by a spring arranged at the top;
The pressure regulating valve has an outer case that has an opening at the top and a peripheral portion that contacts and separates from the first through hole on the bottom surface and a second through hole formed inside the peripheral portion;
A ceiling wall fixed to the upper opening of the outer case and a peripheral wall extending downward from the inner surface of the ceiling wall, and a third through hole is formed inside the peripheral wall of the ceiling wall, and the peripheral wall An inner case having a fourth through hole formed therein,
A support plate attached to the lower surface of the peripheral wall of the inner case;
An auxiliary valve body that is accommodated in the inner case so as to be vertically slidable so as to be in contact with and separated from the third through hole, and is always supported on the support plate by its own weight
A flow path provided between a peripheral wall of the outer case and a peripheral wall of the inner case and communicating with the second through hole of the outer case and the fourth through hole of the inner case. Characteristic valve device.   The valve device according to claim 1, wherein a rib for supporting the auxiliary valve body in a floating state from the upper surface of the support plate is formed on the upper surface of the support plate.   The rib of the said support plate is radially extended from the center of this support plate, and the clearance gap between adjacent ribs is arrange | positioned so that it may align with the 4th through-hole of the said inner case. Valve device.   The valve device according to claim 2 or 3, wherein a portion of the rib of the support plate located at the center of the support plate protrudes at a predetermined height.   The valve device according to any one of claims 1 to 4, wherein a plurality of protrusions are formed on the auxiliary valve body toward the support plate.

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