WO2004059143A1

WO2004059143A1 - Radiator cap with pressure valve

Info

Publication number: WO2004059143A1
Application number: PCT/JP2003/016439
Authority: WO
Inventors: Satoru Torigoe; Hiroshi Watanabe; Takaji Igami; Hiroo Fukunaga; Hideaki Kanazawa; Takayuki Watanabe
Original assignee: Toyo Radiator Co., Ltd.; Calsonic Products, Inc.
Priority date: 2002-12-25
Filing date: 2003-12-19
Publication date: 2004-07-15
Also published as: JP2004218631A; JP3932513B2

Abstract

A cap for a radiator for cooling an engine, capable of achieving reliable sealing ability even in a half-locked state where the cap is a little loose. A maximum diameter of a pressure valve (7) is equal to or less than that of a retainer (5), and the pressure valve (7) is vertically movable supported in the retainer (5). Between the retainer (5) and a plate spring (4) is provided a filler neck seal body (9), and a circular tube-like portion (9b) with a letter T-shaped cross section is projected from the lower surface side of the filler neck seal body (9). The tube-like portion (9b) and the inner surface of a filler neck (2) are brought into contact with each other in a pressing manner, and at the same time, an upper end surface (21) of the filler neck (2) and a flange portion (9a) of the filler neck seal body (9) are brought into contact with each other in a pressing manner.

Description

Rage-taki-yap with pre-shabanolep

TECHNICAL FIELD The present invention relates to a cap with pressure pulp of an engine cooling radie, and more particularly to a cap provided with a double seal to improve its sealing performance. Background art

A filler neck is provided at the upper end of the tank of the radiator for cooling the engine cooling water, and a cap with a pressure valve is detachably attached to the filler neck. A small pipe protrudes from the outer periphery of the filler neck, and the tip of the pipe and the surge tank are connected via a hose. When the temperature of the cooling water rises while the engine is running, and the tank internal pressure exceeds the set pressure, the pressure pulp rises against the spring and moves the internal steam and cooling water from the filler neck to the surge tank. Also, when the engine stops and the pressure in the tank becomes negative, the negative pressure valve provided at the center of the pressure valve is opened, and the cooling water in the surge tank is returned to the radiator tank.

Such a cap with pressure pulp having a double seal structure is known as Japanese Patent Application Laid-Open No. 55-41391. This ensures the sealing performance even if the cap is slightly loosened, prevents steam etc. from flowing out when the pressure valve is opened, maintains the airtightness in the tank, and operates the negative pressure valve when the engine is stopped. It should be sure to operate.

This rajitaki cap has a double-walled, thick-walled sealing body, and the inner cylindrical portion is a cap. At the same time, a coil spring valve seat for urging the pressure valve is provided on the outer circumference of the inner cylinder. Further, a groove is formed on the inner circumference of the outer cylinder, and a ring panel is arranged there. Further, a flange is provided on the upper edge of the outer cylinder so as to protrude radially outward, and an annular convex portion is formed on the outer circumference of the outer cylinder.

A seal is formed by pressing the annular convex portion of the outer cylinder between the inner surface of the filler neck and the inner surface of the filler neck, and the flange portion at the upper end of the outer cylinder is pressed against the upper end surface of the filler neck to form a double seal structure. .

The conventional radial cap using a double cylindrical rubber seal has the disadvantage that the structure is complicated and the assembly of the entire pressure cap is troublesome, and that the sealing performance with the inner surface of the filler neck is not sufficient. That is, since the inner circumference of the outer cylinder is partially held by the ring spring, the holding force is not sufficient.

In addition, when the cap is inserted into or removed from the filler neck, the annular convex portion provided on the outer circumference of the packing may be deformed, and the packing may not be mounted at a proper position. This is because the plane of the cap may be deformed when the cap is attached due to the resistance of the ring panel having rigidity. That is, the axis of the plane may not coincide with the axis of the cap, and in such a case, the sealing property cannot be ensured.

Furthermore, there is a drawback that durability is poor due to the use of a ring panel.

Therefore, an object of the present invention is to provide a radiator cap with a pressure valve having a double seal structure which is easy to manufacture, has good assemblability, and is highly reliable. Disclosure of the invention

The present invention according to claim 1 is a radiator tap with a pressure valve which is detachably attached to an opening of a filler neck (2) of a radiator tank (1). The cap body (3), which is detachably engaged with the upper end opening of the filler neck (2), and is attached to the lower surface of the cap body (3) and has a circular outer periphery extending in the plane direction of the cap. Board panel (4),

The outer diameter of the panel panel (4) is smaller than the outer diameter of the panel panel (4), and the center of the cap body (4) is formed at the center of the cap body (4). 3) a retainer (5) supported by

The outer circumference of the retainer (5) is guided up and down freely on the inner peripheral surface of the retainer (5), and the retainer (5) is urged downward via a spring (6) between the retainer (5) and the bottom of the retainer (5). A pressure valve (7) formed to be smaller than the outer diameter of the retainer (5) and seated on and off the valve seat (31) at the lower end of the filler neck (2);

A flange portion (9a) sandwiched between the pan bottom of the retainer (5) and the panel panel (4), and having a radially outwardly protruding outwardly from the outer periphery of the retainer (5); A tubular portion (%) fitted around the outer periphery of the retainer (5) and a filler neck seal body (9) integrally formed with the flange portion (9a);

The maximum diameter of the tubular portion () of the filler neck seal (9) is formed slightly larger than the inner diameter of the filler neck (2),

When the cap body (3) is in the fully locked state where the cap body (3) is securely locked to the opening of the filler neck (2),

The upper end surface (21) of the filler neck (2) is pressed against the flange portion (9a) of the filler neck seal body (9), and the inner peripheral surface of the filler neck (2) is the outer periphery of the cylindrical portion (%). The retainer (5) is configured to be in contact with the inner periphery of the cylindrical portion () of the 1S filler neck seal body (9),

When the cap body (3) is incompletely locked in the opening of the filler neck (2), A contact portion between an inner peripheral surface of the cylindrical member and an outer periphery of the cylindrical portion (9b) is in a state of maintaining its sealing property, and is a radiator cap with a pressure valve. The present invention described in claim 2 is based on claim 1,

When the cap body (3) is locked to the filler neck (2), the upper end surface (21) of the filler neck (2) is pressed against the flange portion (9a) of the filler neck seal body (9), At a position separated downward from the press contact portion, the inner peripheral surface of the filler neck (2) is configured to press against the outer periphery of the tubular portion (9b),

A radiator cap with a pressure valve configured so that the inner peripheral surface of the filler neck (2) and the outer peripheral surface of the cylindrical portion (9b) maintain a press-contact state even in the incompletely locked state.

The present invention described in claim 3 is based on claim 2,

An annular convex portion is formed on one of the cylindrical portion () and the inner peripheral surface of the filler neck (2) at a position spaced apart from the upper end of the filler neck (2), and through the annular convex portion. This is a radiator cap with a pressure valve formed so that the outer surface of the tubular portion (9b) and the inner surface of the filler neck (2) are pressed against each other.

The present invention described in claim 4 is based on claim 3,

An annular convex portion (20) for sealing is projected from the outer peripheral surface of the cylindrical portion () of the filler neck seal body (9), and an axial height position aligned with the annular convex portion for sealing (20). A radiator cap with a pressure valve in which an annular concave portion (20a) is formed on the inner peripheral surface of the cylindrical portion (9b).

The present invention described in claim 5 is based on claim 3,

A radiator cap with a pressure valve having a plurality of sealing annular projections (20) projecting from the outer peripheral surface of the tubular portion (9b) of the filler neck seal body (9) in the axial direction so as to be spaced apart from each other. Up.

The radiator cap with pressure pulp of the present invention has the above configuration and has the following effects. That is, the filler neck seal body 9 is fitted on the outer periphery of the retainer 5 and is interposed between the bottom of the retainer 5 and the plate panel 4. The filler neck seal body 9 has a disk-shaped flange portion 9a and a tubular portion 9b, and the flange portion 9a is pressed against the upper end surface 21 of the filler neck 2 and the tubular portion 9b. Is pressed against the inner surface of the filler neck 2.

Moreover, the filler neck seal body 9 is in contact with the outer periphery of the retainer 5 and positions the cylindrical portion 9b. Then, the reaction force of the tubular portion 9 generated when the filler neck 2 and the tubular portion 9b are pressed against each other can be reliably held, and the sealing property between the two can be maintained.

Accordingly, even if the cap body 3 is loose, it is possible to prevent steam and hot water from being ejected from the cap when the pressure valve 7 is opened. That is, even if the cap is loose, the press-fitted state between the filler neck 2 and the cylindrical portion 9b is maintained to ensure airtightness, so that steam or the like may leak to the outside of the filler neck 2 and the cap body 3. Absent. Moreover, the retainer 5 serves as a guide, and when the cap is inserted into the filler neck 2, the filler neck seal body 9 is not inadvertently deformed, so that the reliability of the seal is high. In addition, since the seal can always be set at a fixed position, it is possible to ensure the sealing performance when the cap body is loose.

Further, since the maximum diameter of the pressure valve 7 is substantially smaller than that of the retainer 5, the thickness of the tubular portion 9b of the filler neck seal body 9 is relatively small. It can be a compact cap. Conversely, when the maximum diameter of the pressure valve 7 is larger than the outer circumference of the retainer 5 as in the conventional type of double seal, the thickness of the tubular portion of the filler neck seal needs to be extremely large. And The structure is complicated, the installation is troublesome, and the reliability of the seal cannot be ensured. However, since the maximum diameter of the pressure valve 7 is substantially smaller than that of the retainer 5, the thickness of the filler neck seal body 9 is made relatively thin, and the outer periphery of the retainer 5 is Close to the inner surface, it can enhance the sealing effect. That is, the outer periphery of the retainer 5 reliably positions the cylindrical portion 9b of the filler neck seal body 9, and the reliability of the seal can be improved.

In the above configuration, the pressure contact position between the cylindrical portion 9 b of the filler neck seal member 9 and the outer peripheral surface of the filler neck 2 is determined by the pressure contact between the upper end surface 21 of the filler neck 2 and the flange portion 9 a of the filler neck seal member 9. It can be located below the position.

By doing so, it is possible to more reliably prevent steam leakage and the like due to loosening of the cap.

In the above configuration, an annular convex portion is formed on one of the cylindrical portion 9 b of the filler neck seal body 9 and the inner peripheral surface of the filler neck 2, and the cylindrical portion 9 b and the filter are formed via the annular convex portion. The inner surface of the neck 2 can be configured to be pressed against the inner surface.

With this configuration, the cap can be easily attached and detached, and the inner peripheral surface of the filler neck 2 and the cylindrical portion 9b of the filler neck seal body 9 can be reliably sealed. In the above configuration, an annular convex portion 20 for sealing is projected from the outer peripheral surface of the cylindrical portion 9 b of the filler neck seal body 9, and the cylindrical portion 9 b is positioned at an axial height matching the convex portion 20. An annular concave portion 20a can be formed on the inner peripheral surface of the substrate.

With this configuration, the sealing annular projection 20 is easily deformed when the cap is attached or detached, and the cap can be easily attached to the filler neck.

In the above configuration, a plurality of sealing annular projections 20 can be protruded from the outer peripheral surface of the cylindrical portion 9b of the filler neck seal body 9 so as to be spaced apart from each other in the axial direction. In this case, the smaller the sealing annular projection 20 can be formed respectively, it facilitates the deformation of the sealing annular projection ² 0 during more cap detachable, improving the wearability, the cap And the filler neck can be reliably sealed. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal cross-sectional view taken along a line I-I of FIG. 3, which is a radiator cap with a pressure valve according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state where the cap is attached to the filler neck 2.

FIG. 3 is a schematic perspective view showing an example of a filler neck 2 to which the radiator cap is attached.

FIG. 4 is an explanatory view of a seal structure of a radiator cap with a pressure valve according to the present invention. FIG. 5 is an explanatory view of a seal structure showing another example of a radiator cap with a pressure valve of the present invention.

FIG. 6 is an explanatory view of the seal structure in a state where the cap body 3 is loosened.

FIG. 7 is a longitudinal sectional view of an essential part showing another example of a radiator cap with a pressure valve according to the present invention.

FIG. 8 is a longitudinal sectional view of a main part showing still another example of a radiator cap with a pressure valve according to the present invention.

FIG. 9 is a longitudinal sectional view of a main part showing still another example of the radiator cap with a pressure valve of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view taken along the line I-I of FIG. 3, which is a radiator cap with a pressure valve according to the present invention. FIG. 2 is a longitudinal sectional view showing a state in which the cap is completely attached to the filler neck 2. FIG. 3 is a schematic perspective view showing an example of a fiber neck 2 to which the present cap is attached.

As shown in FIG. 2, the rajitaki cap is detachably attached to the opening of the filler neck 2. The cap body 3 has its outer peripheral edge lowered downward, and a part of the lower edge of the falling edge. A pair of claw portions 11 are formed by bending. The claw portion 11 is engaged with a cam surface 23 on a lower surface of a cam flange 23a of the filler neck 2 to be described later so as to be detachably engaged.

A center hole is formed at the center of the cap body 3, and the bottom of the dish-shaped metal fitting 10 is fitted into the center hole, and the upper edge thereof is in sliding contact with the hole edge. The bottom outer surface of the dish-shaped bracket 10 is connected to the outer surface of the pot bottom of the retainer 5, and a leaf spring 4 extending in the plane direction of the cap body 3 is provided between the pot bottom of the retainer 5 and the inner surface of the cap body 3. Is interposed.

The retainer 5 is located outside the plate panel 4 in the axial direction, has an outer diameter smaller than the outer diameter of the plate spring 4, and is formed in an inverted pot shape, and the center thereof is the cap. Supported by the main body. Further, the maximum diameter of the retainer (5) is formed substantially larger than the maximum diameter of the pressure valve 7.

Next, a filler neck member 9 is interposed between the retainer 5 and the leaf spring 4. The filler neck seal body 9 is formed integrally with a disc-shaped portion and a cylindrical portion 9b protruding downward from the vicinity of the outer periphery thereof. The outer peripheral edge of the disc-shaped portion is sufficiently protruded radially outward from the cylindrical portion 9b to form a flange portion 9a. On the outer periphery of the cylindrical portion 9b, as shown in FIG. 4, a sealing annular convex portion 20 is provided so as to project away from the flange portion 9a. An annular stopper 13 is formed in a bent shape on the inner periphery of the lower end of the retainer 5. The annular stopper 13 on the outer periphery of the upper end of the pressure valve 7 is engaged with the annular stopper 13 in a detachable manner. The pressure valve 7 is made of a plastic molded body, is formed in a stepped cylindrical shape, and has a communication hole 17 at the center thereof. A coiled spring 6 is interposed between the inner surface of the pressure valve 7 and the retainer 5 to urge the pressure valve 7 downward. Due to the biasing force, the locking annular convex portion 12 on the upper edge of the pressure valve 7 is seated on the annular stopper 13. A valve seal 18 is attached to the annular seat at the lower end surface of the pressure valve 7. A stem 14 of a negative pressure valve 16 is inserted into the communication hole 17, and a stopper 15 is provided at the upper end thereof. A valve seal 19 is provided on the upper surface of the lower end of the negative pressure valve 16, and these are arranged so as to be vertically movable.

The cap of the present invention thus configured is detachably engaged with the filler neck 2 as shown in FIG. When the engine (not shown) is driven and the cooling water in the radiator tank 1 rises to a certain temperature, the negative pressure causes the negative pressure valve 16 to be lifted upward from the state shown in FIG. I do.

When this cap is fitted to the filler neck 2, the claw 11 of the cap body 3 is inserted from the notch 25 where the cam flange 2; 3a does not exist in FIG. 3, and then the cap body 3 is rotated. As a result, the claw 11 moves on the cam surface 23, and the claw 11 is fixed to the stopper 24. By doing so, the cap of the present invention is completely locked and attached to the filler neck 2. At this time, the upper end surface 21 of the filler neck 2 pushes up the flange portion 9a of the finette seal body 9 to deform the leaf spring 4, so that the upper end surface 21 and the flange portion 9a are brought into pressure contact with each other. At the same time, the inner peripheral surface of the filler neck 2 and the cylindrical portion 9b of the filler neck seal body 9 are pressed against each other at the sealing annular projection 20 as shown in FIG. Next, when the cap body 3 is imperfectly locked to the filler neck 2, that is, when the claw 11 of the cap body 3 is not seated on the stopper 24 in FIG. 3, the upper end face in FIG. The tip of 21 is slightly in contact with the flange portion 9 a of the filler neck seal body 9. To that extent, the sealing property between the upper end face 21 of the filler neck and the flange 9a is not perfect. However, the sealing property between the annular projection 20 for sealing and the inner surface of the filler neck 2 is in a perfect state. Therefore, even if the internal pressure in the fiber neck 2 becomes higher than the set pressure and the pressure valve 7 rises, there is no possibility that the steam or the high-temperature cooling water leaks to the outside of the cap body 3.

Next, FIG. 5 shows another example of the sealing structure between the filler neck seal body 9 and the inner surface of the boiler neck 2. In this example, the inner annular convex portion 22 for sealing projects partially on the inner peripheral surface of the filler neck 2. Have been. The inner annular projection 22 for sealing and the outer surface of the tubular section 9b of the filler neck seal body 9 are pressed against each other.

Also in this example, when the locking state of the cap body 3 is incomplete, the contact between the upper end surface 21 of the filler neck 2 and the flange portion 9a of the filler neck seal body 9 is incomplete as shown in FIG. . However, the inner annular convex portion 22 for sealing of the filler neck 2 and the cylindrical portion 9b are in a pressure contact state, and the valve can be completely sealed.

Next, FIG. 7 is a fragmentary longitudinal sectional view showing another example of the rajetaki cap of the present invention, which is a modification of FIG.

This example differs from FIG. 1 in that an annular concave portion 20a is provided on the inner surface of the tubular portion 9b of the filler neck seal body 9. The annular concave portion 20a is formed at a position matching the axial height of the sealing annular convex portion 20 on the outer surface side of the cylindrical portion 9b, and a part of the cylindrical portion 9b is formed by the convex portion and the concave portion. Are cross-sectionally bent. The pressure of this filler neck seal 9

The inner peripheral surface of 2 is the same as that of FIG. As shown in the example of Fig. 7, by providing the annular concave portion 20a on the inner surface side at the position matching the annular convex portion 20 for sealing, the mounting resistance when the cap is mounted on the filler neck is reduced, and the mountability is good. Can be done.

That is, when the cap is fitted to the filler neck 2, the annular convex portion 20 for sealing and the inner surface of the filler neck 2 are pressed against each other, and the filler neck member 9 and the cap body 3 enter the axial direction while being pressed. At that time, a relatively large penetration resistance is obtained.However, if the annular concave portion 20a is present on the inner surface side, the sealing annular convex portion 20 is relatively easily deformed, and the pressure contact resistance with the circumferential surface of the filler neck 2 is reduced. The cap body 3 can be easily attached to the filler neck 2.

According to the experiments, when the diameter of the cylindrical portion 9b of the filler neck seal body 9 is about 30 cm, the radius R ₂ in the cross section of the annular concave portion 20a is about 0.4 thigh, and A projection radius of about 0.6 on the cross section of the projection 20 is sufficient. At this time, the protrusion amount t of the seal annular convex portion 20 is about 0.2 mm. As a result, it is possible to improve the ease of mounting the rajietakiyap and sufficiently secure the sealability with the filler neck.

Next, FIG. 8 shows still another example of the rajekyaki of the present invention, taking into consideration the mounting property as in FIG.

This embodiment is different from that of FIG. 1 in that a plurality of annular projections 20 for sealing are projected, and a projection radius and a projection width in a cross section of each annular projection 20 for sealing are remarkably greater than those in FIG. That is, it is formed small.

That is, this example has a protrusion radius _{Rl of} about 1/3 of the protrusion radius in the cross section of the sealing annular convex portion 20 of FIG. 1, and the width in the vertical direction in the cross section is formed extremely small. Note that the protrusion amount t can be made approximately the same as that of FIG. Also in this example, when attaching the cap to the filler neck, each small annular projection for sealing is used. 20 can be easily deformed, reducing the resistance during mounting and improving the mounting performance. The sealing force can also be kept good by the plurality of annular convex portions 20 for sealing.

Next, FIG. 9 is a modification example of FIG. 8, in which only one small annular convex portion 20 for sealing is formed on the outer surface of the cylindrical portion 9b of the filler neck seal body 9.

In this example, the cap is more easily attached to the filler neck.

Claims

The scope of the claims

1. In a radiator cap with a pleat valve that is detachably attached to the opening of the filler neck (2) of the radiator tank

A cap body (3) that is removably engaged with the upper end opening of the filler neck (2); and a plate that is attached to the lower surface of the cap body (3) and extends in the plane direction of the cap. Panel (4),

The outer diameter of the panel panel (4) is smaller than the outer diameter of the panel panel (4), and the pot panel (4) is formed in an inverted pot shape and the center of the cap panel (4) is located at the center. 3) a retainer (5) supported by

The outer periphery of the retainer (5) is guided up and down freely on the inner peripheral surface thereof, and is urged downward through a spring (6) between the retainer (5) and the bottom of the pot, so that the maximum diameter is substantially increased. A pressure valve (7) formed to be smaller than the outer diameter of the retainer (5) and seated on and off the valve seat (31) at the lower end of the filler neck (2);

A flange portion (9a) sandwiched between the pan bottom of the retainer (5) and the plate panel (4), and having a radially outwardly protruding outwardly from the outer periphery of the retainer (5); A tubular portion () for fitting the outer periphery of the retainer (5) with the flange portion (9a).

The maximum diameter of the tubular portion () ′ of the filler neck seal (9) is formed slightly larger than the diameter of the filler neck (2),

When the cap body (3) is in the fully locked state where the cap body (3) is securely locked onto the opening of the filler neck (2),

The upper end surface (21) of the filler neck (2) is pressed against the flange portion (9a) of the filler neck seal body (9), and the inner peripheral surface of the filler neck (2) is the outer periphery of the cylindrical portion (%). Press against The retainer (5) is configured to be in contact with the inner periphery of the tubular portion (9b) of the filler neck seal body (9),

When the cap body (3) is incompletely locked in the opening of the filler neck (2), the sealing portion between the inner peripheral surface of the filler neck (2) and the outer periphery of the cylindrical portion (9b) has a sealing property. A radiator cap with a pressure valve that is in a state of keeping.

2. In Claim 1,

When the cap body (3) is locked to the filler neck (2), the upper end surface (21) of the filler neck (2) presses against the flange portion (9a) of the filler neck seal body (9), and At a position separated downward from the press contact portion, the inner peripheral surface of the filler neck (2) is configured to press against the outer periphery of the tubular portion (9b),

A radiator cap with a pressure valve configured so that the inner peripheral surface of the filler neck (2) and the outer peripheral surface of the cylindrical portion (9b) maintain a pressed-contact state even in the incompletely locked state.

3. In Claim 2,

An annular convex portion is formed on one of the cylindrical portion (9b) and the inner peripheral surface of the filler neck (2) at a position spaced below the upper end of the filler neck (2). A radiator cap with a pressure-sensitive vane lobe formed so that the outer surface of the tubular portion (9b) and the inner surface of the filler neck (2) are pressed into contact with each other.

4. In Claim 3,

An annular convex part (20) for sealing is projected from the outer peripheral surface of the tubular part () of the boiler neck seal body (9), and an axial height matching the annular convex part (20) for sealing is provided. A radiator cap with a pressure valve having an annular recess (20a) formed in the inner peripheral surface of the cylindrical portion (9b) at the position.

5. In Claim 3, Radiator cap with pressure valve having a plurality of sealing annular projections (20) protruding from the outer peripheral surface of cylindrical portion (9b) of said filler neck seal body (9), spaced apart from each other in the axial direction. .