TWI595151B - A resinous cap for radiator and the detachably attached structure to filler neck - Google Patents

Description

Resin radiator cover and its installation structure

The present invention relates to a resin radiator cover having a resin cover body and a resin valve body which are mutually connected by fusion, and the resin radiator cover is mounted on a radiator water tank. The mounting structure of the filler neck.

In the past, the applicant has proposed a radiator cover made of a resin attached to a heat sink (Patent Document 1).

The resin radiator cap is detachably attached to the loading hole that protrudes upward from the upper portion of the radiator tank. The resin radiator cover has a cylindrical body that is closed at the upper end and a valve body that is attached to the inside. Further, the cover body is attached to the filling hole as the opening of the radiator tank, and the valve body controls the supply of water to the radiator tank and the discharge of water or steam from the radiator tank.

The resin radiator cover which is formed by combining the cover body and the valve body has a complicated three-dimensional structure. Therefore, in order to prevent the resin from being complicated or difficult to be formed, the target resin cover is usually obtained by separately injection molding the two and combining the formed cover body and the valve body.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2012-233452

However, even if a separate injection molding method is employed, a resin molding technique of a relatively high degree is required in order to integrate the resin cover body and the valve body of the relatively complicated structure into the details. The development cost or manufacturing cost for it also becomes high. If a slight difference in size is generated between the lid body and the valve body during resin molding, defects may occur when the two are combined. Further, after the lid body and the valve body are combined with each other, a gap or the like may be generated in an unintended portion.

On the other hand, if the assembled cover is used over a long period of time in a severe environment such as a temperature change, a difference in deformation due to a difference in thermal expansion or deterioration occurs between the cover body and the valve body, and it gradually increases. The function of causing the resin cover is lowered.

Accordingly, an object of the present invention is to provide a resin radiator cover that solves such problems and a mounting structure for attaching the same to a loading hole that is an opening of a radiator tank.

The first cover of the present invention which solves the above problems is a resin radiator cover which is a resin cover which is detachably attached to the filling hole (2), and the filling hole (2) is self-heating. The top of the water tank (1) is provided to protrude upward; the filling hole (2) is formed as a cylindrical body, and an inlet and outlet pipe for water is provided at an intermediate portion of the axial direction of the cylindrical body. (27), and a neck portion (28) is provided at a lower portion of the cylindrical body in the axial direction; the lid system includes a lid body (3) and a valve body (5), and the lid body (3) is formed as an upper end The closed cylindrical body, the valve body (5) is formed into a cylindrical shape a communication hole (17) for communicating with the inlet and outlet pipe (27) is provided at an intermediate portion of the axial direction of the cylindrical body, and an inner flange shape is provided on an inner circumferential side of the cylindrical body. The valve seat (29) is formed with an upper annular groove (21) on the outer peripheral side of the intermediate portion of the axial direction of the cover body (3), and is formed on the outer peripheral side of the lower portion in the axial direction of the valve body (5). a lower annular groove (22), wherein the valve body (5) is attached to the outer periphery of the upper end portion so as to be fitted into the inner periphery of the cover body (3), and in this state When the resin cap is attached to the loading hole (2), the communication hole (17) of the valve body (5) is in communication with the inlet and outlet pipe (27) of the charging hole (2), and further, on the upper side The first seal ring (15) is fitted into the annular groove (21), and the first seal ring (15) to be fitted is configured to be crimped when the resin cover is attached to the loading hole (2). The state is in contact with the inner peripheral surface of the loading hole (2) above the axial direction of the inlet and outlet line (27), and the second annular groove (22) is embedded with the second dense The ring (16) is configured such that when the resin cover is attached to the loading hole (2), the ring (16) can be brought into contact with the neck of the loading hole (2) by pressure bonding. The inner peripheral surface of the portion (28); the resin-made heat sink cover is characterized in that when the resin cover is attached to the loading hole (2), the sealing portion (10) is positioned by the first sealing ring ( 15) an inner side of the lower end portion of the lid body (3) in the axial direction of the lid body (3) between the second seal ring (16) and the inner side of the seal space formed by the inner peripheral surface of the plug hole (2) The outer peripheral side of the upper end portion of the axial direction of the valve body (5) is melted, and the cap body (3) and the valve body (5) are joined to each other by the welded portion (10).

According to a second aspect of the invention, in the resin radiator cover according to the first aspect of the invention, in the state before the fusion, the inner peripheral side of the lid body (3) in the melted portion is provided with an orientation. a first tapered portion (6) having an inner diameter lower end portion and an inner diameter enlarged (end widened) is provided on an outer peripheral side of the valve body (5) in the melted portion, and is provided at an upper end portion in the axial direction. The second tapered portion (7) having a reduced outer diameter (detailed) is formed, and the inclination angle α of the first tapered portion (6) with respect to the axis is larger than that of the second tapered portion (7). The state of the inclination angle β of the axis; at the start of the fusion, only the upper end portion of the first tapered portion (6) of the cover body (3) and the second tapered portion of the valve body (5) The upper end portion of the axial direction is in contact with each other; the contact is started from the above state, and the molten region is gradually enlarged toward the lower side in the axial direction, thereby forming the welded portion (10).

According to a third aspect of the invention, in the resin radiator cover according to the first aspect of the invention, the valve body (5) or the cover body (3) is provided with deterioration with respect to time of passage of the material or the like. The fragile portion (30) which is deteriorated and damaged is preferentially formed, and the fragile portion (30) is formed inside the sealed space where the sealing function of the sealed space is not broken after the deterioration is damaged.

According to a fourth aspect of the invention, in the resin radiator cover according to the third aspect of the invention, the shape of the lower annular groove (22) provided in the valve body (5) is such that a cross section in the axial direction is formed. a square shape by bringing the upper corner portion (22a) in the peripheral wall surface of the square from the valve seat (29) formed in the valve body (5) to the closest portion (29a) of the upper corner portion (22a) The wall thickness t is smaller than the wall thickness of the other peripheral wall forming the square, and the fragile portion (30) is formed in this portion.

According to a fifth aspect of the invention, there is provided a mounting structure for a cover for a filling hole, which is a mounting structure for detachably attaching a resin cover to the loading hole (2), and the loading hole (2) The system is configured to protrude upward from the top of the radiator tank (1); the mounting structure is characterized in that the filling hole (2) is formed into a cylindrical body, and the cylindrical body is formed in the cylindrical body The middle portion of the axial direction is provided with an inlet and outlet pipe (27) for water, and a neck portion (28) is provided at a lower portion of the axial direction of the cylindrical body; the cover is configured by: having a cover body (3) and valve body (5) The cover body (3) is formed as a cylindrical body whose upper end is closed, and the valve body (5) is formed into a cylindrical body, and is provided at an intermediate portion of the axial direction of the cylindrical body for a communication hole (17) communicating with the inlet and outlet pipe (27), and an inner flange-shaped valve seat (29) on the inner circumferential side of the cylindrical body; in the axial direction of the cover body (3) An upper annular groove (21) is formed on the outer peripheral side of the intermediate portion, and a lower annular groove (22) is formed on the outer peripheral side of the lower portion of the valve body (5) in the axial direction, and the valve body (5) is The outer periphery of the upper end portion is attached to the inside from the lower end of the cover body (3), and the communication hole (17) of the valve body (5) and the loading hole (2) are installed in this state. The inlet and outlet piping (27) is in communication with each other, and the first sealing ring (15) is fitted into the upper annular groove (21), and the first sealing ring (15) to be fitted is crimped. The inner circumferential surface of the filling hole (2) is positioned closer to the axial direction than the inlet and outlet pipe (27), and the second sealing ring (16) is embedded in the lower annular groove (22). , it should be embedded The second seal ring (16) is in contact with the inner peripheral surface of the neck portion (28) of the loading hole (2) in a state of being crimped; and the cover is located at the joint portion (10) by the above-mentioned 1 the inner side of the sealed space formed by the inner circumferential surface of the filling hole (2) between the seal ring (15) and the second seal ring (16), so that the lower end of the cover body (3) is axially lower The inner peripheral side of the portion is melted to the outer peripheral side of the upper end portion of the axial direction of the valve body (5), and the cover body (3) and the valve body (5) are joined to each other by the welded portion (10); The inner peripheral side portion of the loading hole (2) on the lower side of the axial lower end of the valve body (5) is provided with a support portion (50) of the valve body (5), and the valve body (5) is from the above When the cover body (3) is disengaged, the valve body (5) can be prevented from falling into the groove body (1) through the above-mentioned loading hole (2).

According to a sixth aspect of the invention, in the mounting structure of the cover according to the fifth aspect of the invention, the support portion (50) is configured by a step portion (51) provided on an inner circumferential side of the mounting hole (2). Forming, the upper surface of the step portion (51) can be used to support the above The valve body (5) when the detachment occurs.

According to a seventh aspect of the invention, in the mounting structure of the cover according to the fifth aspect of the invention, the support portion (50) is configured to extend from the inner peripheral side of the mounting hole (2) toward the central axis thereof. The portion (52) is formed by the upper surface of the claw portion (52) to support the valve body (5) when the detachment occurs.

According to an eighth aspect of the invention, there is provided a mounting structure for a cover for a filling hole, which is a mounting structure for detachably attaching a resin cover to the loading hole (2), and the loading hole (2) The system is configured to protrude upward from the top of the radiator tank (1); the mounting structure is characterized in that the filling hole (2) is formed into a cylindrical body, and the cylindrical body is formed in the cylindrical body The middle portion of the axial direction is provided with a water inlet and outlet pipe (27), and a neck portion (28) is provided at a lower portion of the axial direction of the cylindrical body; the cover system is provided with a cover body (3) and a valve body (5) The cover body (3) is formed as a cylindrical body whose upper end is closed, and the valve body (5) is formed into a cylindrical body, and is provided at the intermediate portion of the axial direction of the cylindrical body for use in the above The inlet and outlet pipe (27) generates a communication hole (17) for communication, and an inner flange-shaped valve seat (29) is provided on the inner circumferential side of the cylindrical body; the valve body (5) has an outer periphery of the upper end portion thereof Mounted in such a manner that the lower end of the cover body (3) is inserted into the interior thereof, and the valve body (5) is in the above state. The through hole (17) is in communication with the inlet and outlet pipe (27) of the charging hole (2); the inner peripheral side of the cap body (3) and the outer peripheral side of the valve body (5) are configured to be welded by Engaged, and the above-mentioned loading hole (2) is configured in such a manner that a support portion of the valve body (5) is provided on the inner peripheral side of the lower side of the axial lower end of the valve body (5). 50), when the valve body (5) is detached from the cover body (3), the valve body (5) can be prevented from falling into the groove body (1) through the loading hole (2).

According to a first aspect of the invention, the sealing portion is located inside the sealed space formed by the inner circumferential surface of the filling hole (2) between the first seal ring (15) and the second seal ring (16). The inner peripheral side of the lower end portion of the cover body (3) is in contact with the outer peripheral side of the upper end portion of the axial direction of the valve body (5), and the cover body (3) and the valve body (5) are mutually coupled by the welded portion (10) Engage.

The fusion bonding is performed by an ultrasonic wave bonding method, a vibration welding method, a laser melting method, or the like. In the ultrasonic wave bonding method, the cap body (3) and the valve body (5) are brought into contact with each other, and the portions in which the two are in contact with each other are finely vibrated by ultrasonic waves, whereby the portions are thermally melted and melted to each other. At this time, even if there is a large integration error between the resin-molded cover body (3) and the valve body (5), the contact portions can be melted while being integrated with each other to reduce the value of the original unconformity.

Further, since the position of the melted portion (10) which is in contact with the valve body (3) and the valve body (5) is in the sealed space as described above, even if the sealed portion (10) is somewhat incompletely sealed, it is not This causes a poor sealing phenomenon between the joint portion between the lid body (3) and the valve body (5) and the outside of the lid, and becomes a highly reliable resin radiator cap.

According to a second aspect of the invention, the first tapered portion (6) having an inner diameter toward the lower end in the axial direction (the end is widened) is provided on the inner peripheral side of the cap body (3) in the caulking portion. The outer peripheral side of the valve body (5) in the melted portion is provided with a second tapered portion (7) whose outer diameter is reduced toward the upper end portion in the axial direction (the front end is tapered); the first tapered portion (6) is opposite to the first tapered portion (6) The inclination angle α of the axis is formed to be larger than the inclination angle β of the second tapered portion (7) with respect to the axis; at the start of the fusion, only the upper end portion of the first tapered portion (6) of the cover body (3) is in contact with the upper end of the axial direction At the upper end portion of the second tapered portion (7) of the valve body (5) in the axial direction, the molten region is gradually expanded downward in the axial direction by the start of the fusion to form the welded portion (10).

According to this configuration, the fusion region is suppressed to the minimum, and only the necessary fusion region is melted. Therefore, the resin which is excessively melted when it is not melted is leaked to the unnecessary portion, whereby the assembly accuracy after completion is high, and the resin-made radiator cover having reliability is obtained.

According to a third aspect of the present invention, in a part of the valve body (5) or the cover body (3), a fragile portion (30) which is preferentially deteriorated with respect to deterioration of a material such as the year, is provided, and the fragile portion (30) is provided. It is formed inside the sealed space where it does not break the sealing function of the above-mentioned sealed space after deterioration.

If the resin radiator cover is used for a long period of time in a harsh environment such as the vicinity of the internal combustion engine where the temperature changes greatly, damage due to deterioration of the material over the years may occur. In the case of periodic inspections to prevent malfunctions, it is necessary to have a high degree of proficiency in order to identify the degree of deterioration over the years, and there are cases where the deterioration is repeated.

By providing the fragile portion (30) according to the third aspect of the invention, it is possible to easily discriminate the degree of deterioration before the period of deterioration of the year of the damage is reached. Thereby, the cover replacement can be performed before the resin radiator cover itself is largely damaged, so that the safety of the use of the heat sink can be improved. Further, even if the fragile portion (30) is damaged by the deterioration, the fragile portion (30) is formed at a position that does not break the sealing function of the sealed space, that is, inside the sealed space, so that the sealing of the resin radiator cover is not impaired. Sex.

According to a fourth aspect of the invention, the shape of the lower annular groove (22) provided in the valve body (5) is such that a cross section in the axial direction is formed into a square shape, and is formed in the peripheral wall surface of the square. The wall thickness t of the upper corner portion (22a) to the valve seat (29) formed in the valve body (5) closest to the upper corner portion (22a) is smaller than the wall thickness of the other corner peripheral wall forming the square shape. And the fragile portion (30) is formed in the portion.

The position of the fragile portion (30) as described above is compared with other parts. The ratio of the stress concentration of the spring or the like from the body of the squeeze valve is relatively large, and thus it is susceptible to damage due to deterioration over the years. Therefore, it is possible to find the deterioration of the material over the years at the fragile portion (30) earlier and easier.

Moreover, when this part is made into a fragile part, when a crack is started and isolate|separated from it, it can view the situation from the exterior easily. That is, as for the presence or absence of the crack, the crack can be visually observed by removing the second seal ring (16) of the lower annular groove (22).

Further, when the cover is separated from the upper and lower portions thereof, when the grip member (4) is rotated and rotated, only the cover body (3) and the upper portion of the valve body (5) are separated from the loading hole (2). The lower portion of the valve body (5) remains in the filling hole (2). Therefore, the separation of the holes can be directly confirmed in the filling hole (2). Therefore, the replacement of the radiator cover can be performed without missing the period.

According to a fifth aspect of the invention, in the mounting structure, the inner peripheral side portion of the loading hole (2) located on the lower side of the lower end of the valve body (5) is provided with the support of the valve body (5). The portion (50) prevents the valve body (5) from falling into the body of the radiator tank (1) through the filling hole (2) when the valve body (5) is detached from the cover body (3).

According to this configuration, even if one of the welded portion (10) or the resin molded portion is partially damaged, the valve body (5) is detached and dropped downward, and the valve body (5) is caught by the support portion (50). If the valve body (5) is dropped into the body of the radiator tank (1), it is difficult to recover it. However, with this configuration, such a problem can be easily avoided.

According to a sixth aspect of the invention, the support portion (50) is formed by a step portion (51) provided on the inner peripheral side of the filling hole, and the valve body can be supported by the upper surface of the step portion (51). (5). According to this configuration, the support portion (50) can be integrally formed with the filling hole.

According to a seventh aspect of the invention, the support portion (50) is formed by a claw portion (52) extending from the inner peripheral side of the mounting hole toward the central axis thereof, and the upper surface of the claw portion (52) can be supported by the upper surface. Valve body (5). According to this configuration, the support portion (50) can be integrally formed with the filling hole.

According to a seventh aspect of the invention, in the mounting structure, the inner peripheral side of the cover main body (3) and the outer peripheral side of the valve main body (5) are joined by welding; and the loading hole (2) is formed in the loading hole (2). The support portion (50) of the valve body (5) is disposed on the inner peripheral side of the lower end of the valve body (5) on the lower side, which prevents the valve body (5) from being detached from the cover body (3) The body (5) is dropped into the body of the radiator tank (1) through the above-mentioned filling hole (2).

According to the eighth aspect of the invention, even if one of the welded portion (10) or the resin molded portion is partially damaged and the valve body (5) is detached and dropped downward, the valve body (5) is supported by the support portion (50). It is caught, so it can be prevented from falling into the body of the radiator tank (1).

1‧‧‧ radiator tank

2‧‧‧ Filling holes

3‧‧‧ Cover body

3a‧‧‧Intermediate tube

3b‧‧‧Intersection

4‧‧‧ Holding components

5‧‧‧ valve body

6‧‧‧1st tapered part

7‧‧‧2nd tapered part

8‧‧‧ annular groove

9‧‧‧ annular convex

10‧‧‧Solution Department

11‧‧‧1st spring

12‧‧‧2nd spring

13‧‧‧ positive pressure valve

14‧‧‧Negative pressure valve

15‧‧‧1st seal ring

16‧‧‧2nd sealing ring

17‧‧‧Connected holes

18‧‧‧Ring sealing plate

19‧‧‧ Department

21‧‧‧Upper annular groove

22‧‧‧lower annular groove

22a‧‧‧Upper corner

23‧‧‧ Department of Department

23a‧‧‧ Bag Department

24‧‧‧ annular convex

25‧‧‧Spiral

26‧‧‧Claws

27‧‧‧Inlet and outlet pipeline

28‧‧‧ neck

29‧‧‧ valve seat

29a‧‧‧ recent part

30‧‧‧ Fragile Department

40‧‧‧Spring seat

50‧‧‧Support

51‧‧ ‧ step department

52‧‧‧ claws

T‧‧‧ wall thickness

‧‧‧‧Tilt angle

‧‧‧‧Tilt angle

Fig. 1 is a longitudinal sectional view showing a connection structure of a resin-made radiator cap in the first invention.

Fig. 2 is an enlarged view of a main part of Fig. 1 and showing a state before it is melted.

Fig. 3 is a view showing the state after the dissolution of Fig. 2;

Fig. 4 is a partially enlarged cross-sectional view showing the fragile portion and its surroundings in the third invention.

Fig. 5 is an exploded perspective view showing the cover of the fifth invention before being attached to the filling hole.

Figure 6 is a view of the arrow VI-VI in Figure 5.

Figure 7 is a view of the arrow VII-VII in Figure 5.

Next, an embodiment of the present invention will be described based on the drawings.

First, the positional relationship between the machines or parts shown in the drawings or in the parts is described or defined. The cross-sectional views are longitudinal cross-sectional views, and the upper direction (upper side portion) of the drawings shown in the cross-sectional views means or represents the upper direction (upper or upper side) described in the present invention, as shown in the cross-sectional views. The lower direction (lower side portion) of the drawing means or indicates the lower direction (lower or lower side) described in the present invention. Further, the middle of the upper and lower directions in the drawings means or represents the intermediate portion described in the present invention. An example will be described based on FIG. 1 , and the radiator tank 1 is disposed at the lower portion, and the valve body 5 of the lid is disposed on the upper portion of the radiator tank 1 and disposed on the lower side of the lid body 3 . That is, the upper and lower directions of the axis of the loading hole 2 extending vertically upward from the radiator tank 1 coincide with the upper and lower directions defined in the present invention.

In the structure in which the resin-made radiator cap shown in FIG. 1 is attached to the charging hole, the resin-made radiator cap is detachably attached to the loading hole 2 which is provided to protrude vertically upward from the radiator tank 1 . The resin radiator cover includes a grip member 4, a lid body 3, and a valve body 5 in this order from above. Further, the filling hole 2 has a neck portion 28 which is reduced in cross section near the lower side of the radiator tank 1, and a portion of the inner edge of the root portion of the neck portion 28 is formed in an inner flange shape (the surface of the flange is on the inner side) The shape extending in the direction of the central axis). A cylindrical portion that is enlarged upward from the inner flange portion in the axial direction is formed, and a female thread is formed on an inner circumferential surface of the tubular portion. The tubular portion on the upper side of the neck portion 28 is integrally formed on the side surface of the tubular portion through the inlet and outlet line 27 through which the water supply passes, and the inlet and outlet conduit 27 extends horizontally outward from the tubular portion in the radial direction.

The cap body 3 includes a cylindrical body whose upper end is closed, and is formed in a cup shape as a whole. The valve body 5 is also formed in a cylindrical shape. The outer peripheral portion of the upper end portion of the valve body 5 is fitted into the upper portion from the lower end portion of the cover body 3, and the two are sealed and fixed.

The holding member 4 is disposed at the uppermost end of the resin radiator cover. The grip member 4 has a flange portion at its upper portion, and is formed in a shallow cup shape as a whole. The inner peripheral portion of the grip member 4 is press-fitted into the upper end portion of the cap body 3. The engagement member 4 is connected to the cover body 3 by coupling the engagement portion 19 provided on the cover body 3 to the fastening portion 23 of the grip member 4. A screw portion 25 formed of a male screw is formed on the outer peripheral surface of the grip member 4. The screw portion 25 is detachably screwed to the female screw formed on the inner circumferential surface of the filling hole 2. Further, a tool-embedded portion having four or six sides on the outer circumference is protruded from the center of the upper surface of the grip member 4. By holding and rotating the tool by the fitting portion, the holding member 4 can be easily attached and detached to the loading hole 2.

An upper annular groove 21 is formed on the outer peripheral side of the intermediate portion of the cover body 3 in the axial direction, and a lower annular groove 22 is formed on the outer peripheral side of the lower portion of the valve body 5 in the axial direction. The first seal ring 15 is fitted into the upper annular groove 21. The first sealing ring 15 that is fitted is pressed against the inner circumferential surface of the filling hole 2 at a position above the axial direction of the inlet pipe line 27. The second seal ring 16 is fitted into the lower annular groove 22. The second sealing ring 16 that is fitted is pressed against the inner circumferential surface of the neck portion 28 of the filling hole 2. The first seal ring 15 and the second seal ring 16 generally comprise an elastic annular seal material used in the art.

A spring seat 40 is disposed at the center of the lower end of the valve body 5. Further, an inner flange-shaped valve seat portion 29 is provided on the inner circumferential surface of the valve body 5. The positive pressure valve 13 is detachably attached to the valve seat portion 29 via an annular seal plate 18. Further, in the intermediate portion of the valve body 5, a plurality of communication holes 17 facing the outer side in the radial direction are provided at equal intervals in the peripheral direction.

A positive pressure valve 13 is fixed to the upper surface of the annular seal plate 18, and the upper surface of the flange portion of the negative pressure valve 14 is detachably contacted with the lower surface of the annular seal plate 18. A second spring is disposed between the bottom surface of the negative pressure valve 14 and the spring seat 40 of the valve body 5 12. A first spring 11 is disposed between the positive pressure valve 13 and the closed surface of the upper end of the cap body 3.

The first seal ring 15 of the cap body 3 is in contact with the inner peripheral side of the packing hole 2 in a pressure contact state and is positioned above the inlet pipe line 27. The second seal ring 16 of the valve body 5 is in contact with the inner peripheral side of the neck portion 28 of the filling hole 2 in a pressure contact state. By this, the first seal ring 15 and the second seal ring 16 are restricted in the vertical direction, and the inner peripheral surface of the mounting hole 2 faces the inner region (the columnar region) in the central axis direction, thereby forming a sealed space. (or sealable area). The sealing space in which the up-and-down direction is restricted is formed to prevent water leakage from the connection portion of the cap body 3 and the valve body 5 in the resin cap toward the side of the filling hole 2 on the outer side thereof (finally, to the outside of the filling hole 2) Leaky water) waterproof space.

In the sealed space, one portion of the inner peripheral surface of the cap body 3 and a portion of the outer peripheral surface of the upper end portion of the valve body 5 are joined by mutual fusion. The fusion is preferably carried out by ultrasonic welding. The ultrasonic welding method is to transmit a strong ultrasonic wave for melting to a contact region thereof in a state where the members to be melted are brought into contact with each other. Thereby, the contact portion is violently vibrated and melted by heat. Then, if it is cooled and hardened, the members are welded together.

Next, an assembly structure of the cap body 3 and the valve body 5 which are connected by welding will be described. Fig. 1 shows a state in which the inner peripheral side of the axially lower end portion of the cap body 3 and the outer peripheral side of the axially upper end portion of the valve body 5 are mutually sealed. Further, Fig. 2 shows the state before the fusion, and Fig. 3 shows the state after the fusion.

In Fig. 2, a portion of the inner peripheral portion of the cross section on the axis of the cover body 3 which is more downward than the intermediate portion forms an enlarged portion (stepped portion) whose inner diameter is enlarged. Between the enlarged portion having a larger inner diameter and a portion having a smaller inner diameter than the upper portion The annular groove portion 8 that is extended upward. An annular convex portion 9 is formed at an upper end portion of the valve body 5 so as to be substantially integrated in the annular groove portion 8. The upper portion of the inner circumference of the enlarged portion having a larger inner diameter than the annular groove portion 8 is provided with a first tapered portion 6 whose inner diameter is enlarged toward the lower end portion in the axial direction (the end is widened).

On the other hand, in the outer peripheral side of the valve body 5 in the melted portion, that is, below the annular convex portion 9, a second tapered portion 7 whose outer diameter is reduced toward the upper end portion in the axial direction (the tip end is tapered) is provided. The inclination angle α of the first tapered portion 6 with respect to the axis of the cover body 3 is formed to be larger than the inclination angle β of the second tapered portion 7 with respect to the axis of the valve body 5. Furthermore, the central axis of the cap body 3 is coaxial with the central axis of the valve body 5.

At the start of the fusion bonding, only the upper end portion of the first tapered portion 6 of the cap body 3 in the axial direction is in contact with the upper end portion of the second tapered portion 7 of the valve body 5 in the axial direction. After the start of the fusion, the fusion region is gradually enlarged toward the lower side in the axial direction to form a ring-shaped fusion portion 10 facing downward.

An annular convex portion 24 for temporary assembly is formed on the outer periphery of the lower end of the second tapered portion 7 of the valve body 5 (the outer periphery of the upper portion of the valve body 5). When the cap body 3 and the valve body 5 are assembled, the annular convex portion 24 is press-fitted from the lower side to the same temporary fixing claw 26 that protrudes from the inner periphery of the lower end of the cap body 3 (the ring of the valve body 5 is locked) The inside of the convex portion 24) (see Figs. 2 and 4). The outer diameter of the annular convex portion 24 is formed larger than the inner diameter of the locking claw 26, and the annular convex portion 24 of the valve body 5 is pressed over the locking claw 26 of the cover body 3, and the annular convex portion 24 is pressed. The locking claw 26 is locked, and the valve body 5 and the cap body 3 are temporarily assembled without being separated. At this time, as shown in FIG. 2, an annular pocket portion 23a is formed between the inner periphery of the lower end portion of the cap body 3 and the annular convex portion 24 and the second tapered portion 7. Further, a slight gap (not shown) is formed between the outer circumference of the annular convex portion 9 at the upper end of the valve body 5 and the inner circumference of the intermediate tubular portion 3a.

As shown in Fig. 2, an intersection portion 3b is provided at the upper end of the first tapered portion 6 of the intermediate tubular portion 3a. At the start of the fusion, the upper end of the second tapered portion 7 is in contact with the intersection portion 3b. When the ultrasonic wave is melted in the state of FIG. 2, the fusion region gradually travels downward from the intersection portion 3b of the lid body 3 as a starting point. At this time, the cover The body 3 is pressed against the valve body 5 side, and its melting point gradually moves downward. As shown in FIG. 3, the cover body 3 relatively moves downward relative to the valve body 5. Further, a welded portion 10 is formed between the valve body 5 and the cap body 3. The molten region is hardened by cutting off the power of the ultrasonic welding device, and the valve body 5 and the cap body 3 are melted. The welded portion 10 is a blackened portion shown in FIG. The size of the welded portion 10 is significantly smaller than that of the conventionally welded portion, and the remaining molten resin is prevented from leaking to the outer periphery to be hardened.

effect

In the resin radiator cover assembled as described above, the screwing portion 25 of the grip member 4 is screwed to the upper end of the loading hole 2 by inserting and rotating a tool such as a wrench at the center of the upper end of the grip member 4. Opening the two to connect the two. At this time, the positive pressure valve 13 and the negative pressure valve 14 are closed by the pressing force of the spring, and the inside of the radiator tank 1 is sealed. When the temperature of the cooling water of the radiator tank 1 rises and the pressure thereof is equal to or higher than the set value, the positive pressure valve 13 pushes up the first spring 11 and rises. Thereby, the excess steam and the cooling water in the tank are guided from the inlet and outlet line 27 to the buffer tank (not shown) via the communication hole 17. If the internal pressure of the radiator tank 1 is lowered again, the positive pressure valve 13 is closed.

On the other hand, for example, if the temperature of the cooling water inside the radiator tank 1 is lowered by the stop of the engine, the inside of the radiator tank 1 becomes a negative pressure. Then, the negative pressure valve 14 presses the second spring 12 downward and moves downward. Thereby, water is supplied from the outlet pipe 27 to the radiator tank 1 via the negative pressure valve 14.

In the resin-made radiator cap of FIG. 1, even if there is a sealing failure in the sealing portion 10 of the cap body 3 and the valve body 5, the inner peripheral surface of the cylindrical portion of the first seal ring 15 and the filling hole 2 is kept airtight (sealed). Sex). Further, the airtightness between the second seal ring 16 and the neck portion 28 is also maintained. As a result, when the temperature of the radiator tank 1 rises, The pressure valve 13 normally functions to rise, and the negative pressure valve 14 is lowered after the internal pressure becomes negative. Since the valves of the present invention operate normally, the resin radiator cover of the present invention can normally maintain the function of the resin radiator cover even if the sealing portion 10 is insufficiently sealed.

Fig. 4 is a view showing an example in which the fragile portion 30 is provided in a portion of the valve body 5 in the resin cover of Fig. 1. In FIG. 4, the same portions as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will not be repeated.

The annular groove 22 provided on the lower side of the valve body 5 has a shape as shown in Fig. 4, and its axial cross section is formed in a square shape. The wall thickness t from the upper corner portion 22a of the square wall surface of the square to the valve portion 29 formed in the valve body 5 closest to the upper corner portion 22a is smaller than the other portions. That is, the wall thickness t is formed to be smaller than the wall thickness of the other peripheral wall (the peripheral wall surrounding the square) forming the square. Thereby, the fragile portion 30 is formed in this portion.

As described above, the portion of the wall thickness t is relatively larger in proportion to the stress concentration of the first spring 11 or the like which presses the valve body 5 downward than the other portions. Therefore, it is susceptible to damage due to deterioration over the years. Further, by making the wall thickness t of the portion smaller as described above, the rate of deterioration of the portion is greater than that of the other portions. As a result, the signs of deterioration over the years can be confirmed more quickly and accurately. That is, in the case where it is assumed that the fragile portion 30 is deteriorated to be damaged, the fragile portion 30 is formed in a region where the sealing function of the sealed space is not broken, that is, the inner region of the sealed space, without impairing the sealing function of the sealed space.

Fig. 5 is a view showing an example in which the support portion 50 that receives the valve body 5 from below is provided.

The valve body 5 constituting the resin cover is detached from the cover body 3 due to damage or the like. In the case of this, the support portion 50 catches the valve body 5 to prevent it from falling into the radiator tank 1.

Further, the combination of the cap body 3 and the valve body 5 shown in the upper portion of Fig. 5 and the structure of the grip member 4 are the same as those of the cap body 3 and the valve body 5 shown in Fig. 1 and the structure of the grip member 4.

A longitudinal section of the radiator tank 1 and the filling hole 2 projecting perpendicularly upward therefrom is shown at the bottom of FIG. The position of the central axis of the filling hole 2 protruding from the radiator tank 1 in Fig. 5 is not coincident with the central axis of the radiator tank 1 as shown in Fig. 1, but is biased to the left side of Fig. 5. Further, a step portion 51 is provided on the inner peripheral side of the left side of the filling hole 2.

The step portion 51 has a shape in which the peripheral wall on the side of the offset is bent outward by substantially 90 degrees, and is bent upward by substantially 90 degrees from above. With such a shape, the step portion 51 is as shown in Fig. 6, and its plane is a part of a circular ring (arc-shaped ring). It is assumed that one of the welded portion 10 or the resin molded portion associated with the valve body 5 is partially damaged and the valve body 5 is detached from the cover body 3 and dropped to the lower side. At this time, since the valve body 5 is caught by the step portion 51 constituting the support portion 50, it does not fall into the body of the radiator tank 1. Further, as shown in FIG. 1, the position of the central axis of the filling hole 2 may be aligned with the central axis of the radiator tank 1, and the step portion 51 may be provided on the inner peripheral side of the filling hole 2.

In FIG. 5, the support part 50 further shows the nail|claw part 52. The claw portion 52 is provided to extend horizontally from the inner peripheral portion of the filling hole 2 in the direction of the central axis. In the example of FIG. 5, in the inner peripheral portion which is slightly lower than the position of the step portion 51, four circular arc plates are provided at equal intervals in the circumferential direction, thereby constituting the claw portion 52 group. As shown in FIG. 5, both the step portion 51 and the claw portion 52 may be provided as the support portion 50, but In the case of the offset as shown in FIG. 5, only one of the claw portion 52 or the step portion 51 may be provided, for example, only the claw portion 52 or the like may be provided.

1‧‧‧ radiator tank

2‧‧‧ Filling holes

3‧‧‧ Cover body

3a‧‧‧Intermediate tube

4‧‧‧ Holding components

5‧‧‧ valve body

10‧‧‧Solution Department

11‧‧‧1st spring

12‧‧‧2nd spring

13‧‧‧ positive pressure valve

14‧‧‧Negative pressure valve

15‧‧‧1st seal ring

16‧‧‧2nd sealing ring

17‧‧‧Connected holes

18‧‧‧Ring sealing plate

19‧‧‧ Department

21‧‧‧Upper annular groove

22‧‧‧lower annular groove

23‧‧‧ Department of Department

23a‧‧‧ Bag Department

24‧‧‧ annular convex

25‧‧‧Spiral

26‧‧‧Claws

27‧‧‧Inlet and outlet pipeline

28‧‧‧ neck

29‧‧‧ valve seat

40‧‧‧Spring seat

Claims (8)

A resin radiator cover which is a resin cover which is detachably mounted to the filling hole (2), and the filling hole (2) protrudes upward from the top of the radiator water tank (1) The filling hole (2) is formed as a cylindrical body, and in the axial middle portion of the cylindrical body, a water inlet and outlet pipe (27) is provided, and in the cylindrical body a lower portion of the axial direction is provided with a neck portion (28); the cover portion is provided with a cover body (3) and a valve body (5), and the cover body (3) is formed as a cylindrical body having an upper end closed, and the valve body ( 5) is formed into a cylindrical body, and a communication hole (17) for communicating with the inlet and outlet pipe (27) is provided at an intermediate portion of the axial direction of the cylindrical body, and is inside the cylindrical body a valve seat (29) having an inner flange shape is disposed on the side, and an upper annular groove (21) is formed on an outer peripheral side of the intermediate portion of the axial direction of the cover body (3), in the axial direction of the valve body (5) a lower annular groove (22) is formed on the outer peripheral side of the lower portion; the valve body (5) has an outer periphery of the upper end portion that is inserted into the inner periphery thereof from the lower end of the cover body (3). When the resin cover is attached to the loading hole (2) in this state, the communication hole (17) of the valve body (5) and the inlet and outlet lines of the loading hole (2) are (27) a communication is formed, and a first seal ring (15) is embedded in the upper annular groove (21), and the first seal ring (15) to be fitted is configured to mount the resin cover to the above When the hole (2) is filled, it can be brought into contact with the inner circumferential surface of the loading hole (2) which is closer to the axial direction than the inlet and outlet pipe (27), and the lower annular groove (22) A second seal ring (16) is embedded, and the second seal ring (16) to be embedded is configured to cover the resin When mounted to the above-mentioned loading hole (2), it can be brought into contact with the inner peripheral surface of the neck portion (28) of the above-mentioned filling hole (2) in a state of being crimped; the resin-made heat sink cover is characterized in that a resin cover is used When the mounting hole (2) is attached, the sealing portion (10) is positioned on the inner circumferential surface of the filling hole (2) between the first sealing ring (15) and the second sealing ring (16). The inner side of the lid body (3) is welded to the outer peripheral side of the valve body (5) in such a manner as to form the inner side of the sealed space, and the cover body (3) and the valve are provided by the sealing portion (10). The main body (5) is joined to each other, and an annular convex portion (24) for temporary assembly is formed on the outer periphery of the upper portion of the valve body (5), and a valve is protruded from the lower portion of the cover main body (3). The annular convex portion (24) of the main body (5) is a locking claw (26) for temporary assembly, and the outer diameter of the annular convex portion (24) is formed to be larger than the locking claw (26). The inner diameter, the annular convex portion (24) of the valve body (5) is pushed in over the claws (26) of the cover body (3), and the annular convex portion (24) is stopped by the above The claw (26) is locked, and the above valve body (5) and upper The cover body (3) is temporarily assembled in a manner that is not separated. A resin radiator cover which is a resin cover which is detachably mounted to the filling hole (2), and the filling hole (2) protrudes upward from the top of the radiator water tank (1) The filling hole (2) is formed as a cylindrical body, and in the axial middle portion of the cylindrical body, a water inlet and outlet pipe (27) is provided, and in the cylindrical body a lower portion of the axial direction is provided with a neck portion (28); the cover portion is provided with a cover body (3) and a valve body (5), and the cover body (3) is formed as a cylindrical body having an upper end closed, and the valve body ( 5) is formed into a cylindrical body, and a communication hole (17) for communicating with the inlet and outlet pipe (27) is provided at an intermediate portion of the axial direction of the cylindrical body, and is inside the cylindrical body a valve seat (29) having an inner flange shape is disposed on the side, and an upper annular groove (21) is formed on an outer peripheral side of the intermediate portion of the axial direction of the cover body (3), in the axial direction of the valve body (5) a lower annular groove (22) is formed on the outer peripheral side of the lower portion; the valve body (5) has an outer periphery of the upper end portion that is inserted into the inner periphery thereof from the lower end of the cover body (3). When the resin cover is attached to the loading hole (2) in this state, the communication hole (17) of the valve body (5) and the inlet and outlet lines of the loading hole (2) are (27) a communication is formed, and a first seal ring (15) is embedded in the upper annular groove (21), and the first seal ring (15) to be fitted is configured to mount the resin cover to the above When the hole (2) is filled, it can be brought into contact with the inner circumferential surface of the loading hole (2) which is closer to the axial direction than the inlet and outlet pipe (27), and the lower annular groove (22) A second seal ring (16) is fitted, and the second seal ring (16) to be fitted is configured to be in contact with the resin when the resin cover is attached to the loading hole (2). The inner circumferential surface of the neck portion (28) of the filling hole (2); the resin radiator cover is characterized in that the resin cover is attached to the loading hole (2), and the sealing portion (10) is used. The cover body (3) is provided on the inner side of the sealed space formed by the inner circumferential surface of the filling hole (2) between the first seal ring (15) and the second seal ring (16). It The inner peripheral side is welded to the outer peripheral side of the valve body (5), and the cap body (3) and the valve body (5) are joined to each other by the welded portion (10), and the configuration is as follows: In the state of the inner peripheral side of the cap body (3) in the above-mentioned melted portion, a first tapered portion (6) whose inner diameter is enlarged toward the lower end portion in the axial direction (the end is widened) is provided. In the outer peripheral side of the valve body (5) in the melted portion, a second tapered portion (7) whose outer diameter is reduced toward the upper end portion in the axial direction and whose outer diameter is reduced (the front end is tapered) is formed, and the first tapered portion is formed. (6) The inclination angle α with respect to the axis is greater than the inclination angle β of the second tapered portion (7) with respect to the axis; at the start of the fusion, only the first tapered portion of the cover body (3) ( 6) The upper end portion of the axial direction comes into contact with the upper end portion of the second tapered portion (7) of the valve body (5) in the axial direction, and starts to be welded from the above state, and the molten region gradually becomes lower toward the axial direction. The ground is enlarged, thereby forming a welded portion (10). A resin radiator cover which is a resin cover which is detachably mounted to the filling hole (2), and the filling hole (2) protrudes upward from the top of the radiator water tank (1) The filling hole (2) is formed as a cylindrical body, and in the axial middle portion of the cylindrical body, a water inlet and outlet pipe (27) is provided, and in the cylindrical body a lower portion of the axial direction is provided with a neck portion (28); the cover portion is provided with a cover body (3) and a valve body (5), and the cover body (3) is formed as a cylindrical body having an upper end closed, and the valve body ( 5) is formed into a cylindrical body, and a communication hole (17) for communicating with the inlet and outlet pipe (27) is provided at an intermediate portion of the axial direction of the cylindrical body, and is inside the cylindrical body a valve seat (29) having an inner flange shape is disposed on the side; and an upper annular groove is formed on an outer peripheral side of the intermediate portion of the axial direction of the cover body (3) (21) a lower annular groove (22) is formed on an outer peripheral side of the lower portion of the valve body (5) in the axial direction; and the valve body (5) has an outer periphery of the upper end portion from the cover body (3) The lower end is opened and inserted into the interior thereof, and when the resin cover is attached to the loading hole (2) in this state, the communication hole (17) of the valve body (5) is connected to the above The inlet and outlet lines (27) of the filling holes (2) are connected to each other, and the first sealing ring (15) is fitted into the upper annular groove (21), and the first sealing ring (15) to be fitted is attached. When the resin cap is attached to the loading hole (2), it can be brought into contact with the upper portion of the loading hole (2) closer to the axial direction than the inlet and outlet pipe (27). The inner circumferential surface is fitted with a second seal ring (16) in the lower annular groove (22), and the second seal ring (16) to be fitted is configured to mount the resin cover to the loading hole (2). When the pressure is in contact with the inner peripheral surface of the neck portion (28) of the loading hole (2); the resin radiator cover is characterized in that the resin cover is attached to the above filling In the case of the hole (2), the sealing portion (10) is formed by the inner circumferential surface of the filling hole (2) between the first sealing ring (15) and the second sealing ring (16). In the inner side of the space, the inner peripheral side of the cap body (3) is melted to the outer peripheral side of the valve body (5), and the cap body (3) and the valve body (5) are formed by the fusing portion (10). The joint between the valve body (5) or the cover body (3) is provided with a weak portion (30) which is preferentially deteriorated and damaged with respect to deterioration caused by the passage of time of the material, etc. The fragile portion (30) is formed inside the sealed space where the sealing function of the sealed space is not broken after the deterioration damage. For example, the resin radiator cover of the third application of the patent scope is constituted as follows: The shape of the lower annular groove (22) provided in the valve body (5) is such that its axial cross section is formed in a square shape, so that the upper corner portion (22a) of the peripheral wall surface of the square is formed The wall thickness t of the valve seat (29) of the valve body (5) from the closest portion (29a) of the upper corner portion (22a) is smaller than the wall thickness of the other peripheral wall forming the square, and the above-mentioned portion is formed in the portion Fragile Department (30). A mounting structure for a cover for a filling hole, which is a mounting structure for detachably mounting a resin cover with respect to the loading hole (2), and the filling hole (2) is a self-heating water tank ( 1) is provided in such a manner as to protrude upward; the mounting structure is characterized in that the filling hole (2) is formed as a cylindrical body, and water is disposed in an intermediate portion of the axial direction of the cylindrical body An inlet and outlet pipe (27), and a neck portion (28) is disposed below the axial direction of the cylindrical body; the cover is configured to include a cover body (3) and a valve body (5), the cover The main body (3) is formed as a cylindrical body whose upper end is closed, and the valve body (5) is formed into a cylindrical body, and an intermediate portion of the axial direction of the cylindrical body is provided with the inlet and outlet pipes ( 27) a communicating communication hole (17) is formed, and an inner flange-like valve seat (29) is provided on the inner circumferential side of the cylindrical body; and an outer peripheral side of the intermediate portion of the axial direction of the cover body (3) is formed. An upper annular groove (21) is formed on the outer peripheral side of the axial direction lower portion of the valve body (5), and a lower annular groove (22) is formed; the valve body (5) mounting the outer periphery of the upper end portion so as to be fitted into the inside from the lower end of the cover body (3). In this state, the communication hole (17) of the valve body (5) is The inlet and outlet pipes (27) of the charging hole (2) are connected to each other, and the first sealing ring (15) is embedded in the upper annular groove (21). The first sealing ring (15) to be fitted is in contact with the inner peripheral surface of the loading hole (2) at a position higher than the axial direction of the inlet and outlet pipe (27) in a state of being pressed, below The second annular groove (22) is embedded with a second sealing ring (16), and the second sealing ring (16) that is fitted is in contact with the neck (28) of the filling hole (2) in a state of being crimped. The inner peripheral surface is configured such that the sealing portion (10) is located on the inner circumferential surface of the loading hole (2) between the first sealing ring (15) and the second sealing ring (16). The inner side of the lid body (3) is welded to the outer peripheral side of the valve body (5) in such a manner as to form the inner side of the sealed space, and the cover body (3) and the valve are provided by the sealing portion (10). The main body (5) is engaged with each other; and the inner peripheral side of the loading hole (2) located lower than the axial lower end of the valve body (5) is formed with a claw extending toward the central axis thereof (52) a support portion (50) of the valve body (5) is provided, and when the valve body (5) is detached from the cover body (3), the valve body is supported by the upper surface of the claw portion (52). (5), can prevent the valve body (5) from passing the above Filling holes (2) fall down to the tank body (1). The mounting structure of the cover of the fifth aspect of the patent application is characterized in that the support portion (50) has a step portion (51) which is circumferentially spaced apart from the claw portion (52). The position is formed in such a manner that the surface is uniform, and the upper surface of the claw portion (52) and the upper surface of the step portion (51) can be used to support the valve body (5) when the detachment occurs. A mounting structure for a cover for a filling hole, which is a mounting structure for detachably mounting a resin cover with respect to the loading hole (2), and the filling hole (2) is a self-heating water tank ( 1) The top portion is protruded upwardly; the mounting structure is characterized by: The filling hole (2) is formed as a cylindrical body, and an inlet and outlet pipe (27) for water is provided at an intermediate portion of the axial direction of the cylindrical body, and is disposed at an axial lower portion of the cylindrical body. There is a neck portion (28); the lid system includes a lid body (3) and a valve body (5), the lid body (3) is formed as a cylindrical body having an upper end closed, and the valve body (5) is formed into a cylindrical body And a communication hole (17) for communicating with the inlet and outlet pipe (27) is provided at an intermediate portion of the axial direction of the cylindrical body, and an inner flange shape is provided on an inner circumferential side of the cylindrical body. a valve seat (29); the valve body (5) is mounted such that an outer circumference of the upper end portion thereof is fitted into the interior of the cover body (3) from the lower end thereof, and the valve body (5) is installed in this state. The communication hole (17) is in communication with the inlet and outlet pipe (27) of the charging hole (2), and the inner peripheral side of the cap body (3) and the outer peripheral side of the valve body (5) are configured by The above-mentioned filling hole (2) is configured to be formed so as to be oriented from the inner peripheral side of the lower end of the axial direction of the valve body (5) toward the central axis thereof. The support portion (50) of the valve body (5) is provided in the extended claw portion (52), and when the valve body (5) is detached from the cover body (3), the claw portion (52) is used. The surface is supported by the valve body (5) to prevent the valve body (5) from falling into the groove body (1) through the above-mentioned filling hole (2). A resin radiator cover which is a resin cover which is detachably mounted to the filling hole (2), and the filling hole (2) protrudes upward from the top of the radiator water tank (1) The resin radiator cover is characterized in that the charging hole (2) is formed as a cylindrical body, and an inlet and outlet pipe for water is provided at an intermediate portion of the axial direction of the cylindrical body ( 27) and below the axial direction of the cylinder a neck portion (28) is provided; the cover system includes a cover body (3) and a valve body (5), and the cover body (3) is formed as a cylindrical body whose upper end is closed, and the valve body (5) is formed as a cylindrical body, and a communication hole (17) for communicating with the inlet and outlet pipe (27) is provided at an intermediate portion of the axial direction of the cylindrical body, and a convex portion is provided on an inner peripheral side of the cylindrical body. a valve seat (29) having a rim shape; the valve body (5) is attached to the outer periphery of the upper end portion by being inserted into the inner periphery of the cover body (3), and the valve body is installed in this state. (5) the communication hole (17) is in communication with the inlet and outlet pipe (27) of the charging hole (2), and the inner peripheral side of the cap body (3) and the outer peripheral side of the valve body (5) are configured. Engaged by welding; an annular convex portion (24) for temporary assembly is formed on the outer periphery of the upper portion of the valve body (5), and a valve body (5) is protruded from the lower portion of the cover body (3). The annular convex portion (24) is a locking claw (26) for temporary assembly, and the outer diameter of the annular convex portion (24) is formed to be larger than the inner diameter of the locking claw (26). When the above valve (5) The annular convex portion (24) is pressed in over the locking claw (26) of the cover body (3), and the annular convex portion (24) is stuck by the above-mentioned locking claw (26) The valve body (5) and the cover body (3) are temporarily assembled without being separated.