JP2008157039A - Attaching-detaching structure of cap and attaching-detaching structure of radiator cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiator cap allowing easy attaching-detaching operation of the radiator cap to a filler neck. <P>SOLUTION: A cap body 1 is provided with a lock mechanism 5 of checking slipping-out of the radiator cap C by elastically engaging engaging lock claws 52 and 52 by coil springs 51 and 51 with engaging step parts 72 and 72 formed on an inner wall of the filler neck 7 by inserting the cap body 1 into an opening part of the filler neck 7, and a lock release mechanism 6 of releasing an engaging state of the engaging lock claws 52 and 52 with the engaging step parts 72 and 72 against energizing force of the coil springs 51 and 51 by rotating a knob part 66 exposed to an upper surface of the cap body 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cap attachment / detachment structure and a radiator cap attachment / detachment structure for sealing a filler neck of a radiator tank in a vehicle such as an automobile so as to be opened and closed.

As a conventional radiator cap, a positive pressure valve that is elastically biased by a positive pressure valve spring inside a cap body that is detachably attached to the upper end opening edge of a filler neck of a radiator tank and closes a water injection port in the filler neck And a valve shaft slidably inserted in a through hole formed in the central portion of the positive pressure valve, and an annular seal portion abutting on the inner surface of the water inlet in the positive pressure valve The thing of the structure provided with the negative pressure valve comprised with the negative pressure valve main body which closes a through-hole is known (for example, refer patent document 1).
JP 2001-73768 A

  However, in the case of the radiator cap of the conventional example, the cap body is pushed in and rotated so that the outer peripheral engagement claw portion of the cap body is engaged with the inverted U-shaped engagement portion of the filler neck, and the radiator cap is attached. And the radiator cap is removed by releasing the engagement of the outer peripheral engaging claw portion of the cap body with the inverted U-shaped engaging portion of the filler neck by pushing the cap main body and rotating it in reverse. For this reason, there is a problem that the attaching / detaching operation of the radiator cap is troublesome.

  The problem to be solved by the present invention is to provide a radiator cap capable of easily performing the attaching / detaching operation of the cap with respect to the opening and the attaching / detaching operation of the radiator cap with respect to the filler neck.

  In order to solve the above-described problem, the cap attaching / detaching structure according to claim 1 is a cap attaching / detaching structure that closes the opening so as to be freely opened and closed, and the cap body is inserted into the opening by inserting the cap into the opening. A lock mechanism that elastically engages an engagement lock claw with an urging means against an engagement step formed on the inner wall of the cap and prevents the cap from coming off, and a release operation portion exposed on the upper surface of the cap body A lock release mechanism for releasing the engagement state of the engagement lock claw with respect to the engagement step portion against the urging force of the urging means by rotating did.

  According to a third aspect of the present invention, there is provided a structure for attaching and detaching a radiator cap. The cap main body closes the filler neck opening by being detachably attached to the upper end opening edge of the filler neck of the radiator tank. A positive pressure valve that is elastically urged by a pressure valve spring and communicates with a reserve tank formed on the inner wall of the filler neck and that closes between the radiator tank and a shaft hole formed in the positive pressure valve. A negative pressure valve comprising a valve shaft that is movably inserted, and a negative pressure valve body that is provided on the valve shaft and that has an annular seal portion in contact with the back surface of the positive pressure valve to close the shaft center hole. And a radiator cap attaching / detaching structure, wherein the cap body is inserted into the filler neck opening by inserting the cap body into the filler neck opening. A lock mechanism that elastically engages an engagement lock claw with a biasing means against the formed engagement step portion to prevent the radiator cap from coming off, and a release operation portion exposed on the upper surface of the cap body. And a lock release mechanism for releasing the engagement state of the engagement lock claw with respect to the engagement step portion against the urging force of the urging means.

  In the cap attaching / detaching structure according to the first aspect of the present invention, since it is configured as described above, by inserting the cap body into the opening, the engaging step formed on the inner wall of the opening is biased by the biasing means. The engagement lock claw is elastically engaged, thereby preventing the cap from being pulled out of the opening.

  Further, by rotating the release operation part exposed on the upper surface of the cap body from this state, the engagement state of the engagement lock claw with respect to the engagement step part is released against the urging force of the urging means. The cap can be removed from the opening.

  Therefore, an effect that the cap can be easily attached to and detached from the opening can be obtained.

  Since the radiator cap attaching / detaching structure according to claim 3 is configured as described above, the cap main body is inserted into the opening of the filler neck, thereby biasing the engaging step formed on the inner wall of the filler neck. The engagement lock claw is elastically engaged by the means, whereby the radiator cap is prevented from coming off from the filler neck.

  Further, by rotating the release operation part exposed on the upper surface of the cap body from this state, the engagement state of the engagement lock claw with respect to the engagement step part is released against the urging force of the urging means. The radiator cap can be removed from the filler neck.

  Therefore, an effect is obtained that the radiator cap can be easily attached to and detached from the filler neck.

  Embodiments of the present invention will be described below with reference to the drawings.

  The apparatus according to the first embodiment corresponds to the invention described in claims 3 and 4.

First, the radiator cap of this embodiment will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a mounting lock state of the radiator cap of this embodiment, FIG. 2 is an enlarged transverse sectional view showing a main part locking mechanism and a lock releasing mechanism part showing a lock mechanism and a lock releasing mechanism part in FIG. FIG. 3 is a longitudinal sectional view showing the unlocked state of the radiator cap of this embodiment.

  The radiator cap C of this embodiment includes a cap body 1, a positive pressure valve 2, a positive pressure coil spring (positive pressure valve spring) 3, a negative pressure valve 4, a lock mechanism 5, and an unlock mechanism 6. I have.

  More specifically, the filler neck 7 of the radiator tank to which the radiator cap C is mounted is formed in a cylindrical shape as shown in FIG. A communication hole 71 communicating with the reserve tank is formed (see FIG. 1).

  The cap body 1 is formed in a hollow body in which a bottom plate 13 having a circular hole 13a is fitted and integrated with a lower end opening of a cylindrical portion 12 closed by a ceiling wall 11, and the ceiling wall 11 and the bottom plate On the outer periphery of 13, seal rings 14 and 15 are provided for sealing between the outer peripheral surface and the inner peripheral surface of the filler neck 7.

  Both the seal rings 14 and 15 are arranged above and below the communication hole 71 of the filler neck 7, respectively. A through hole 12 a that communicates with the communication hole 71 is formed in the peripheral wall of the cylindrical portion 12.

  The positive pressure valve 2 serves to close the circular hole 13a formed in the bottom plate 13 in the cylindrical portion 12 so as to be freely opened and closed. A valve packing 22 is provided on the lower surface of the positive pressure valve main body portion 21, and the positive pressure valve By pressing the outer peripheral edge of the valve packing 22 against the upper opening edge of the circular hole 13a by the biasing force of the positive pressure valve spring 3 interposed between the main body 21 and the ceiling wall 11, the circular hole 13a Thus, the space between the communication hole 71 formed in the filler neck 7 and the inside of the radiator tank is closed.

  Further, a guide shaft 24 is mounted on a shaft hole 23 formed in the central part of the positive pressure valve main body 21 and the valve packing 22 constituting the positive pressure valve 2, and the upper and lower ends of the guide shaft 24 are connected to the positive pressure valve main body part. By bending and crimping to the upper surface side of 21 and the lower surface side of the valve packing 22, the positive pressure valve main body portion 21 and the inner peripheral edge portion of the valve packing 22 are connected and fixed.

  The negative pressure valve 4 includes a valve shaft 41 that is slidable in a vertically slidable manner from the lower side to the upper side in the guide shaft 24, and an annular seal portion on the upper peripheral side of the outer peripheral edge of the lower end portion of the valve shaft 41. A disc-shaped negative pressure valve main body 42 having a protrusion 42a is integrally formed with a synthetic resin having buoyancy, and a stopper pin 43 for preventing the negative pressure valve 4 from falling off is mounted on the upper end side of the valve shaft 41. ing.

  A gas-liquid replacement flow path that communicates between the radiator tank and the reserve tank when the negative pressure valve 4 is opened is formed by the annular gap h between the shaft hole 23 and the valve shaft 41.

  That is, the negative pressure valve 4 is opened downward by its own weight in the state before installation shown in FIG. 1, and is pushed upward by buoyancy due to an increase in the internal pressure of the radiator tank or a rise in the coolant level. It is designed to close.

  The lock mechanism 5 is configured so that the cap body 1 is inserted into the opening of the filler neck 7 so that each of the engagement step portions 72 and 72 formed by the opposing concave portions of the inner wall of the filler neck 7 is coil spring ( The urging means 51, 51 elastically engages the engagement lock claws 52, 52 to prevent the radiator cap C from coming off and rotating, and the lock release mechanism 6 includes the coil springs 51, 51. The mechanism 5 and 6 serve to release the engagement state of the engagement lock claws 52 and 52 with respect to the engagement step portions 72 and 72 against the urging force. It is provided at the top.

  More specifically, a pair of receiving portions 16 and 16 are erected on the upper surface of the ceiling wall 11 of the cap body 1 with the axial center as a center, and the receiving portions 16 and 16 are engaged and locked. The coil springs 51 and 51 are interposed between the claws 52 and 52.

  In addition, a pair of engagement arms 17 and 17 are erected on the inner side of the receiving portions 16 and 16, and engagement claws 17 a and 17 a projecting outward for assembling the lock release mechanism 6 are provided at the upper ends thereof. Is provided.

  That is, the lock release mechanism 6 includes a shaft portion 62 inserted between the engagement arms 17 and 17 at the center of the back surface of the disc-shaped main body portion 61 that is rotatably inserted into the opening of the filler neck 7. A ratchet gear 63 is provided on the outer periphery of the shaft portion 62 (see FIG. 2).

  An annular recess 65 having an engaging step portion 64 at the opening edge is formed on the back surface of the disc-shaped main body portion 61 on the outer periphery of the base portion of the shaft portion 62. The disc-shaped main body 61 is rotatably connected to the cap main body 1 by the elastic engagement of the engaging claws 17 a and 17 a of 17 and 17.

  Further, at the center of the upper surface of the disc-shaped main body portion 61, a knob portion (release operation portion) 66 in which an engaging groove 66a that can be rotated by inserting a coin, a screwdriver or the like is formed.

  On the other hand, as shown in FIG. 2, arms 53, 53 are extended from opposite side surfaces of the engagement lock claws 52, 52 toward both side surfaces of the ratchet gear 63. Ratchet claws 54 and 54 that engage with the ratchet gear 63 are formed.

  Next, the operation and effect of the above embodiment will be described.

[When installing the radiator cap]
Since the radiator cap C of this embodiment is configured as described above, when the radiator cap C is inserted into the opening of the filler neck 7, it is formed on the inner wall of the filler neck 7 as shown in FIGS. The engagement lock pawls 52 and 52 are elastically engaged with the engaged stepped portions 72 and 72 by the coil springs 51 and 51, thereby preventing the radiator cap C from coming off the filler neck 7. The opening of the filler neck 7 is closed by both the seal rings 14 and 15.

  [When removing the radiator cap]

  Further, from this state, when a coin, a screwdriver or the like is inserted into the engaging groove 66a formed in the knob portion (release operation portion) 66 and the disk-shaped main body portion 61 is rotated counterclockwise, as shown in FIG. Further, when the ratchet gear 63 provided on the outer periphery of the shaft portion 62 rotates counterclockwise, the engagement lock claw 52, via the arms 53, 53 with the ratchet claw 54, 54 engaged with the ratchet gear 63, 52 is pulled back in the direction of the shaft portion 62 against the urging force of the coil springs 51, 51, thereby releasing the engagement state of the engagement lock claws 52, 52 with respect to the engagement step portions 72, 72. The radiator cap C can be extracted from the filler neck 7.

  Therefore, the effect that the attachment / detachment operation of the radiator cap C with respect to the filler neck 7 can be performed easily is obtained.

  Next, the operation of the radiator cap C of the embodiment configured as described above is simplified.

[When the positive and negative pressure valves are not operating]
FIG. 1 shows a state before starting the engine with the radiator cap C attached to the filler neck 7 of the radiator tank. That is, in this state, the outer periphery of the valve packing 22 is pressed against the opening edge of the circular hole 13a formed in the bottom plate 13 by the urging force of the positive pressure coil spring 3 to communicate with the inside of the radiator tank and the reserve tank. A space between the communication hole 71 and the positive pressure valve 2 is closed.

  Further, the negative pressure valve 4 falls downward due to its own weight and is in a valve open state. That is, the gas-liquid replacement flow path constituted by the annular gap h is in a state where the inside of the radiator tank and the communication hole 71 communicating with the reserve tank are communicated.

  Therefore, when the engine is started from this state, the coolant is heated and the pressure in the radiator tank rises. Therefore, first, the air in the radiator tank passes through the gas-liquid replacement flow path constituted by the annular gap h. Then, the gas is exhausted into the reserve tank through the through hole 12a and the communication hole 71.

  Next, when air escapes and the liquid level of the coolant rises, the negative pressure valve 4 rises by buoyancy, and at the same time, the coolant passes through the gas-liquid replacement flow path constituted by the annular gap h and passes through the through hole 12a. In addition, the coolant flows in the direction of the reserve tank via the communication hole 71. When the coolant flows through the gas-liquid replacement flow path formed by the annular gap h, the dynamic pressure according to the flow rate of the coolant, A force that pushes up the negative pressure valve 4 is applied by the frictional force acting on the outer peripheral surface and the static pressure. As a result, the annular seal portion 42 a formed on the upper surface of the negative pressure valve main body 42 is the lower surface of the valve packing 22 in the positive pressure valve 2. , The negative pressure valve 4 is closed, and thereafter, the valve is maintained closed by the pressure in the radiator tank (static pressure).

  Therefore, normally, the high-pressure and high-temperature liquid or gas inside the radiator tank is prevented from leaking outside through the communication hole 71 of the filler neck 7.

[When positive pressure valve is activated]
Next, when the pressure in the radiator tank rises above a predetermined level, the positive pressure valve 2 is pushed upward against the urging force of the positive pressure valve coil spring 3, and as a result, the valve packing 22 of the positive pressure valve 2 becomes a circular hole. A flow path is formed that separates from the opening edge of 13a and communicates from the inside of the radiator tank to the reserve tank via the circular hole 13a, the through hole 12a, and the communication hole 71.

  Therefore, when the pressure inside the radiator tank exceeds a predetermined level, the radiator cap C automatically releases the pressure inside the radiator tank to the reserve tank, and as a result, the pressure inside the radiator tank is maintained at the predetermined level.

[When operating negative pressure valve]
Next, when the pressure in the radiator tank exceeds a predetermined level and becomes a negative pressure state, the negative pressure valve 4 falls due to the suction force due to the negative pressure and the negative weight of the negative pressure valve 4, and as a result, the communication hole 71 passes through the reserve tank. Through the hole 12a, a flow path is formed which communicates with the inside of the radiator tank via a gas-liquid replacement flow path formed by the annular gap h.

  Accordingly, when the pressure inside the radiator tank exceeds a predetermined level and becomes negative, air or coolant liquid flows from the reserve tank into the radiator tank, and as a result, the pressure in the radiator tank is maintained at the predetermined level.

  Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.

  For example, in the embodiment, the attachment / detachment structure of the radiator cap with respect to the filler neck has been described. However, the present invention can be applied to any attachment / detachment structure of the cap that closes the opening so as to be freely opened and closed.

  In the embodiment, the ratchet gear and the ratchet claw are used as the lock release mechanism. However, the belt connected to the engagement lock claw is wound around the shaft portion by the rotation of the release operation portion, thereby engaging the engagement step portion. The engagement state of the lock claw may be released.

  Further, in the embodiment, the description has been made by taking the type without the coil spring for the negative pressure valve as an example. However, as in the conventional example, this type is also applied to the type that is biased to the closed state by the coil spring. The invention can be applied.

It is a longitudinal cross-sectional view which shows the attachment lock state of the radiator cap of an Example. It is a principal part expanded horizontal sectional view which shows the lock mechanism and lock release mechanism part in FIG. It is a longitudinal cross-sectional view which shows the lock release state of the radiator cap of an Example.

Explanation of symbols

C Radiator cap 1 Cap body 11 Ceiling wall 12 Cylindrical part 12a Through hole 13 Bottom plate 13a Circular hole 14 Seal ring 15 Seal ring 16 Receiving part 17 Engaging arm 17a Engaging claw 2 Positive pressure valve 21 Positive pressure valve body 22 Valve packing 23 Axle Hole 24 Guide shaft 3 Positive pressure valve coil spring (positive pressure valve spring)
4 Negative Pressure Valve 41 Valve Shaft 42 Negative Pressure Valve Body 42a Annular Seal 43 Stopper Pin 5 Locking Mechanism 51 Coil Spring (Biasing Unit)
52 Engagement lock claw 53 Arm 54 Ratchet claw 6 Lock release mechanism 61 Disk-shaped main body part 62 Shaft part 63 Ratchet gear 64 Engagement step part 65 Annular recessed part 66 Knob part (release operation part)
66a engagement groove 7 filler neck 71 communication hole 72 engagement step portion h annular gap

Claims (4)

A cap detachable structure for closing the opening so as to be freely opened and closed.
By inserting the cap body into the opening, the engagement lock claw is elastically engaged with the engagement step formed on the inner wall of the opening by the biasing means, and the cap is removed. The engagement state of the engagement lock claw with respect to the engagement step portion is released against the urging force of the urging means by rotating the lock mechanism for preventing the rotation and the release operation portion exposed on the upper surface of the cap body. And a lock release mechanism that allows the cap to be attached and detached.   2. The cap according to claim 1, wherein a ratchet gear is integrally provided at a lower portion of the release operation unit, and the engagement lock claw is provided with a ratchet claw that engages with the ratchet gear. Detachable structure. A cap body that detachably attaches to an upper end opening edge of a filler neck of a radiator tank, and closes the filler neck opening, and is elastically biased by a positive pressure valve spring inside the cap body. A positive pressure valve closing a space between the communication tank communicating with the reserve tank formed in the inner wall of the neck and the radiator tank; a valve shaft slidably inserted in a shaft hole formed in the positive pressure valve; and the valve shaft A negative pressure valve comprising a negative pressure valve main body that is provided with a negative pressure valve main body that closes the shaft hole by contacting an annular seal portion on the back surface of the positive pressure valve,
By inserting the cap body into the opening of the filler neck, the engagement lock claw is elastically engaged with the cap main body by an urging means with respect to the engagement step formed on the inner wall of the filler neck. A lock mechanism that prevents the radiator cap from coming off, and a release operation portion that is exposed on the upper surface of the cap main body is rotated to resist the urging force of the urging means so that the engagement lock claw of the engagement lock claw with respect to the engagement step portion A radiator cap attaching / detaching structure, comprising: a lock releasing mechanism for releasing the engaged state.   The radiator cap according to claim 3, wherein a ratchet gear is integrally provided at a lower portion of the release operation portion, and the engagement lock claw is provided with a ratchet claw that engages with the ratchet gear. Detachable structure.

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