JPH08135446A - Cap of reservoir tank for cooling liquid - Google Patents

Abstract

PURPOSE: To eliminate a rubber hose which has heretofore been necessary reduce the number of parts, lighten a weight, and reduce a cost by integratedly forming a nipple which is provided in order to prevent cooling liquid from being splashed toward a circumference and which is provided with an opening port on a lower side, of resin with a cap main body. CONSTITUTION: A cap 1 consists of a main body 2 and a nipple 3. The nipple 3 consists of a cylindrical upper directed part 6 which is penetrated on the roof plate 5 of the cap main body 2, a cylindrical horizontally directed part 7 which extends from the upper end of the upper directed part 6 to the outer circumferential side of the cap main body 2, and a cylindrical lower directed part 8 which extends from the way of the horizontally directed part 7 to a lower side and whose top end is opened to a lower side. A vent hole 9 is opened to the top end of the horizontally directed part 7, and also a plug 11 for sealing the vent hole 9 is provided though a hinge 10. Under-cutting is avoided by the vent hole 9, and the pin 26 for forming the hollow part of the horizontal directed part 7 is slipped off. It is thus possible to integratedly form the cap main body 2 and the nipple 3 with each other of resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reserve tank cap for storing a coolant for an internal combustion engine.

[0002]

2. Description of the Related Art In recent automobile internal combustion engines, in order to reduce the consumption of the cooling liquid as much as possible, a reserve tank is connected to the radiator and a predetermined range amount of the cooling liquid is stored in the reserve tank. As shown in FIG. 4, the cap 5 attached to the mouth portion 41 of the reserve tank 40.
The first cap body 52 is provided with a nipple 53 that releases the internal pressure of the reserve tank 40 to the atmosphere. Generally, the cap body 52 and the nipple 53 are integrally formed of resin. The nipple 53 has a tubular upward portion 54 that penetrates the top plate of the cap body 52, and a tubular lateral portion that extends from the upper end of the upward portion 54 to the outer peripheral side of the cap body 52 and has its tip open laterally. 55 and.

Here, if the opening of the sideways portion 55 is left exposed, when the cooling liquid L stored in the reserve tank 40 violently dances into the nipple 53 due to vibration during traveling of the vehicle, the cooling liquid L is stored. L is sideways part 5
5 may be discharged laterally from the opening of 5, and scattered around the reserve tank 40 to adhere to other parts (not shown).
Therefore, a rubber hose 56 is fitted to the tip of the sideways portion 55, and the rubber hose 56 is bent downward so that its tip opens downward. In this way, the cooling liquid L simply drips downward from the opening of the rubber hose 56,
The scattering problem is unlikely to occur.

[0004]

However, since the conventional cap 51 requires the rubber hose 56 as described above, there are problems that the number of parts increases, the weight increases, and the cost increases. To solve this problem, as shown in FIG. 5, the downward portion 57 extending downward from the tip of the lateral portion 55 may be integrally formed with the nipple 53, and the tip of the downward portion 57 may be opened downward. However, since such a downward U-shaped nipple 53 has a typical undercut shape, a pin for forming a hollow portion of the nipple 53 in the molding die (not shown) of the cap 51 has a structure that does not come off. Actually, it could not be integrally molded.

An object of the present invention is to solve the above-mentioned problems and to integrally mold a nipple having a downward opening capable of preventing splashing of a cooling liquid to the surroundings with a cap body with a resin. An object of the present invention is to provide a cap for a cooling liquid reserve tank, which can eliminate the required rubber hose, reduce the number of parts, reduce the weight, and reduce the cost.

[0006]

In order to achieve the above object, a cap of a reserve tank for a coolant according to the present invention comprises a cap body attached to an opening of a reserve tank for storing a coolant of an internal combustion engine, and a cap. A nipple that is provided in the main body and releases the internal pressure of the reserve tank to the atmosphere, and the nipple is a tubular upward portion that penetrates the top plate of the cap body, and a cylinder that extends from the upper end of the upward portion to the outer peripheral side of the cap body. -Shaped laterally facing part, a cylindrical downward facing part that extends downward from the middle of the laterally facing part and has a tip opening downward, a punched hole formed at the end of the laterally facing part, and a hinge provided in the laterally facing part. The cap body and the entire nipple are integrally molded of resin.

[0007]

In the cap of the cooling liquid reserve tank of the present invention, the downwardly facing U-shaped nipple is formed by the cylindrical upward-facing portion, laterally-facing portion, and downward-facing portion. By this, undercut is avoided, and in the mold for molding the cap, the pin for forming the hollow portion of the sideways portion is pulled out, so that the cap body and the entire nipple can be integrally molded with resin.

Moreover, since the plug capable of closing the hole is integrally formed in the laterally-facing portion via the hinge, the hinge can be easily bent at any time after the molding to close the hole, and a separate plug. There is no need to prepare.

Further, since the tip of the downward portion is opened downward, it is not necessary to fit a rubber hose into the nipple as in the conventional case. Even when the cooling liquid stored in the reserve tank violently dances into the nipple due to vibrations when the vehicle is running, the cooling liquid only drips downward from the opening of the downward portion and is unlikely to splash to the surroundings. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a cap of a coolant reserve tank connected to a radiator of an internal combustion engine for automobiles will be described with reference to FIGS. The cap 1 of the present embodiment includes a cap main body 2 attached to the mouth portion 41 of the reserve tank 40, and a nipple 3 provided in the cap main body 2 to open the internal pressure of the reserve tank 40 to the atmosphere. The cap body 2 includes an annular side wall 4 that is locked to the outer periphery of the edge portion of the mouth portion 41 of the reserve tank 40, and a disc-shaped top plate 5 that closes the opening of the mouth portion 41.

The nipple 3 has a tubular upward portion 6 that penetrates the top plate 5 of the cap body 2, a tubular lateral portion 7 that extends from the upper end of the upward portion 6 to the outer peripheral side of the cap body 2, and a lateral portion 7. And a cylindrical downward portion 8 extending downward from the middle thereof and having a tip opening downward, and these are downwardly U-shaped. The tip of the laterally-facing portion 7 projects slightly from the above-mentioned depression-like U-shape, and a hole 9 is formed in the end face of the tip.
Further, as shown in FIGS. 2 and 3, a protruding plug 11 is provided on the upper end of the lateral portion 7 via a thin plate-shaped hinge 10 extending upward, and the plug 11 is shown in FIG. As shown, the hinge 10 is bent so that it can be fitted into the hole 9 to close it. The concave-convex fitting shape 12 formed on both of the holes 9 and the stopper 11 does not come off. The cap body 2 and the entire nipple 3 are integrally molded with resin by the following molding die.

In FIG. 2, in addition to the cap 1, its molding die 20 is schematically shown in phantom. This molding die 20 is composed of an upper mold 21 for molding the upper side of the cap 1, a lower mold 22 for molding the lower side of the cap 1, and a horizontal mold 23 for molding from the tip of the sideways portion 7 to the plug 11. It is a split type. The lower die 22 has two pins 2 for molding the hollow portion of the upward portion 6 and the hollow portion of the downward portion 8 respectively.
4, 25 are provided so that they can enter and withdraw. Also,
The horizontal mold 23 and the upper mold 21 are provided with a pin 26 for forming a hollow portion of the laterally-facing portion 7 so that the pin 26 can be inserted and removed, and the entrance of the pin 26 corresponds to the hole 9 in the laterally-facing portion 7.

That is, in the cap 1 of the present embodiment, the downward facing U-shaped nipple 3 is formed by the tubular upward portion 6, the lateral portion 7, and the downward portion 8, but the lateral portion 7 is formed.
Since the undercut is avoided by the hole 9 formed at the tip of the cap 26 and the pin 26 is removed, the cap body 2 and the entire nipple 3 can be integrally molded with resin.

Moreover, a plug 11 capable of closing the hole 9
Is integrally formed on the lateral portion 7 via the hinge 10, the hinge 10 can be easily bent at any time after molding to close the vent hole 9 with the plug 11, and it is not necessary to prepare a separate plug.

Further, since the tip of the downward portion 8 is opened downward, it is not necessary to fit a rubber hose into the nipple as in the conventional case, and the number of parts can be reduced, the weight and cost can be reduced. Then, even when the cooling liquid L stored in the reserve tank 40 violently dances into the nipple 3 due to the vibration during traveling of the vehicle, the cooling liquid L only drips downward from the opening of the downward facing portion 8 and Is unlikely to occur.

The present invention is not limited to the configuration of the above-described embodiment, but may be embodied with appropriate modifications within the scope not departing from the spirit of the invention, for example, as follows. (1) Change the formation position of the hinge and the plug in the sideways portion. (2) A tubular connecting portion for fitting a connecting hose between the radiator and the reserve tank is integrally formed in addition to the nipple.

[0017]

Since the cap of the reserve tank for cooling liquid of the present invention is configured as described above, a nipple having a downward opening capable of preventing the cooling liquid from being scattered around is provided together with the cap body. Since it can be integrally molded with resin, it is possible to omit a rubber hose which has been conventionally required, and it is possible to reduce the number of parts, reduce the weight, and reduce the cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state in which a cap according to an embodiment of the present invention is attached to a reserve tank.

FIG. 2 is a cross-sectional view showing a molding method of the cap and a state after molding.

FIG. 3 is a plan view of the cap of FIG.

FIG. 4 is a cross-sectional view of a conventional reserve tank cap.

FIG. 5 is a cross-sectional view of a hypothetical cap before reaching the present invention.

[Explanation of symbols]

 1 Cap 2 Cap Body 3 Nipple 6 Upward Part 7 Sideways Part 8 Downward Part 9 Vent Hole 10 Hinge 11 Plug 40 Reserve Tank 41 Port L Coolant

Claims (1)

[Claims] 1. A cap main body attached to an opening of a reserve tank for storing a coolant of an internal combustion engine, and a nipple provided in the cap main body for releasing the internal pressure of the reserve tank to the atmosphere, the nipple comprising: A tubular upward portion that penetrates the top plate of the cap body, a tubular lateral portion that extends from the upper end of the upward portion toward the outer peripheral side of the cap body, and a tip that opens downward from the middle of the lateral portion and opens downward. And a cylindrical downward facing part,
A side wall, and a stopper provided in the side wall through a hinge to close the hole. The cap body and the entire nipple are integrally molded of resin. Reserve tank cap for cooling liquid.