JPS58134855A - Liquid tank for reserve and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reserve liquid tank, particularly to various reserve liquid tanks to be mounted on a vehicle, and a method for manufacturing the same.

For example, a radiator coolant reserve tank, a brake oil reserve tank, a clutch oil reserve tank, and the like must not leak even if the vehicle vibrates while the vehicle is running.

In order to prevent this liquid leakage, conventionally, a small hole for air venting that communicates with the outside air is made in the camp at the top of the tank body, and
A labyrinth was provided between this small hole and the liquid level in the tank.

However, if a labyrinth-like space is provided between the outside air and the liquid surface, the liquid in the tank may foam during vibrations or high temperatures.

In the case of atomization, it is difficult to prevent the air liquid from leaking to the outside, especially in a confined space.

In addition, it is necessary to keep the replacement fluid as pure as possible, and for this reason, a reserve fluid tank that can be handled while keeping the replacement fluid sealed is required.

It is an object of the present invention to overcome the problems of the conventional reserve liquid tank, satisfy the above requirements, prevent liquid leakage even during vibrations or high temperatures, and seal the replacement liquid. To provide an improved reserve liquid tank which can be easily replaced while maintaining its originality, and a method for manufacturing the same.

In order to achieve this object, the present invention provides a reserve liquid tank containing a replacement liquid, in which the tank body is integrally molded of synthetic resin, and a part or the entire body of the tank body is formed into a bellows shape. At the same time, a threaded part is provided on the outer periphery of the open joint part, and the open end of the joint part is sealed by a gasket glued to the open end and a temporary cap screwed onto the threaded part of the joint part. A cylindrical body made of synthetic resin with an open end is injection molded so as to have a thick part and a thin part in the longitudinal direction, and then the molded cylindrical body is mounted in a mold. The present invention is characterized in that by plow molding, at least a portion of the thick portion is formed into an open threaded portion, and the thin portion is formed into a bellows.

Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a reserve liquid tank according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a reserve liquid tank body integrally molded from synthetic resin, and a part of its body 2 is formed into a bellows 6, and a threaded portion 5 is attached to the outer periphery of an open joint portion 4. is provided. Replacement fluid 6, for example oil, is fully injected into the tank up to the opening end of the joint section 4, and the same opening section of the joint section 4 is filled with the gasket 7.
It is glued and sealed. As a result, the exchange liquid 6 is sealed inside the tank 1. The packing 7 is preferably made of a thin material such as an aluminum sheet, packing material, thin synthetic resin, or other material that is relatively strong but easily broken by sharp members. A temporary cap 8 is screwed into the threaded portion 5 of the joint portion 4 so as to sandwich the gasket 7 into the opening end. Note that the bellows 3 may be provided over the entire body portion 2 of the tank body 1.

The reserve liquid tank of the present invention configured as described above is used, for example, in the following manner.

FIG. 2 is a side sectional view showing the state of the reserve liquid tank of the present invention immediately before it is attached to a mask cylinder, etc., and FIG.
The figure is a side sectional view of the main part showing the state after installation.

That is, at the time of use (during liquid exchange), the temporary cap 8 is removed and the joint portion 4 is directed toward the connection port 10 of the mask cylinder 9, as shown in FIG. The connection port 10 is a cylindrical protruding structure formed perpendicular to the main body of the mask cylinder 9, and a threaded portion 11 that fits the threaded portion 5 of the joint portion 4 is provided on the inner periphery of the connection port 10. A cylindrical needle 12 having a hole communicating with the cylinder body is provided at the center bottom of the cylinder body and protrudes outward. The outer diameter of the needle 12 is formed to a size that allows it to be inserted into the diameter of the hole of the joint portion 4, and the top thereof is cut diagonally and the cut end is sharp.

When the joint part 4 of the tank 1 is screwed into the connection port 10, the center part of the seal 7 is pierced by the cut end of the needle 12, and the seal 7 is inserted in a ring shape as shown in Fig. 3. It is tightly attached to the flat bottom of the connection port 10, and screwing is completed. As a result, the reserve liquid tank is attached to the mask cylinder 9, and the inside of the mask cylinder 9 and the inside of the tank 1 are communicated with each other. The mask cylinder 9 is filled with oil in advance, and by attaching the tank 1 to its connection port 10, the oil in the tank 1 is transferred to the needle 12 through the communication hole, so that the oil can flow with each other. Become.

In the reserve liquid tank of the present invention, since the bellows 6 is formed on a part or the whole of the body 2 of the tank body 1, the tank body 1 can be attached to the mask cylinder 9.
Following the change in the volume of the replacement liquid 6 inside, the bellows 3 that seals the liquid 6 can expand and contract.

In other words, the tank body 1 can expand and contract in response to the vibrations and volume changes of the liquid 6 even during vibrations or high temperatures, so the liquid level is always in close contact with the inner wall of the tank body 1, preventing the liquid 6 from foaming or atomizing. There is no space created that allows for this. Moreover, a gasket 7 is interposed between the bottom part 4 and the connection port 10 to make it liquid-tight. Therefore, liquid leakage as in the conventional case is prevented.

Further, in the reserve liquid tank of the present invention, a threaded part 5 is provided on the outer periphery of the joint part 4, and the temporary cap 8 is screwed onto the threaded part 5 of the joint part 4 while the joint part 4 is adhesively sealed with a packing 7. Because of this, it is possible to reserve the replacement liquid 6 in a sealed state before installing it on the mask cylinder 9 to maintain the original quality. At the same time, when installing it, the temporary cap 8 is removed and the joint part 4 is connected to the connection port 10 of the mask cylinder 9. It is easy to operate and can be installed securely as it only needs to be screwed into the holder. It goes without saying that the object to which the tank 1 is attached is not limited to the mask cylinder 9 described above.

The synthetic resin in the present invention is easy to mold,
It is also preferable to use a resin with high elasticity, such as nylon, polyethylene, polypropylene, etc. Also,
In order to perform the expansion and contraction movement of the bellows 3 more smoothly,
The bellows 3 portion needs to be formed thinner than other portions of the tank body 1.

Next, a method for manufacturing a reserve liquid tank of the present invention will be explained.

Figure 4 is a vertical cross-sectional view of the tank body prototype made by injection molding, Figure 5 is a vertical cross-sectional view of the tank body prototype and mold in blow molding, and Figure 6 is a vertical cross-section of the tank body after blow molding. It is a front view.

In FIG. 4, reference numeral 20 is an injection molded tank body prototype, which is a cylindrical body made of synthetic resin with one end open and having a thick part 21 and a thin part 22 in the longitudinal direction. Note that the flange 26 on the opening side is necessary for holding the tank body prototype 20 in a mold in the next blow molding process.

In FIG. 5, 60 is a two-part mold, and the inner wall surface of the hollow side has a threaded part 31, a body part 62 and Each has a bellows portion 36. Reference numeral 40 denotes a mold for holding the flange, which has a cap shape, and has an inner diameter large enough to fit the flange portion 23, and the thick wall portion 21 of the tank body prototype 20 can be inserted into the bottom of the cap shape. It has a size. 50 is a cylindrical mold having a compressed air supply hole 51. Flange part 2 of tank body prototype 20
3 is inserted into the mold 40 and placed over the opening 30a of the mold 60 so that its main body protrudes into the center of the mold 60. A mold 50 is inserted into the cap of the mold 40 from above, and the flange 23 is held in close contact between the end of the mold 50 and the bottom of the mold 40. The opening 30a of the mold 60 has a size that allows the outer diameter portion of the thick portion 21 of the tank body prototype 20 to be inserted therein.

Now, as shown in FIG. 5, the tank body prototype 20 is held between the upper opening of the mold 60, and the flange 23 is inserted into the mold 40,
50, compressed air A is supplied to the inside of the tank body model 20 from the hole 51 of the mold 50. As a result, the tank body prototype 20, which is in a heated and softened state immediately after injection molding, is subjected to pressure from inside, so that it expands and is molded to correspond to the shape of the inner wall surface of the mold 60. That is, the thick part 21 of the master model 20 is molded as the threaded part 5 and the body part 2, and the thin part 22 is molded as the bellows 6. In addition, when forming the whole body part 2 into the bellows 3, the thick part 21 is formed only in the part corresponding to the threaded part 5, and the other part becomes the thin part 22.

A threaded portion 61 and a bellows portion 36 are formed on the inner wall surface of the corresponding mold 30.

After the molding is completed, the supply of compressed air A is stopped, and the mold 30,
Remove 40 and 50. Then, as shown in Fig. 6, cut horizontally from the top of the joint part 4, and
Separate. After that, as shown in Figure 1, (after storing the replacement fluid 6), glue and seal the gasket 7 to the joint part 4.
By screwing the temporary cap 8 onto the threaded portion 5, the reserve liquid tank of the present invention is obtained.

As explained above, in the reserve liquid tank of the second invention, part or the entire body of the tank body is formed into a bellows, so the liquid in the tank oscillates during vibrations or high temperatures. Even if the bellows expands or expands, or the liquid level drops due to use, the bellows expands and contracts according to the volume change, so the liquid can always be kept in a sealed state.
No spaces are created that allow the liquid to bubble or atomize. Furthermore, a gasket is interposed between the joint portion and the connection port. Therefore, liquid leakage as in the conventional case can be prevented.

Furthermore, the replacement fluid in the tank can be reserved in a sealed state before installation on the master cylinder, etc. to maintain the original product, and the installation operation is easy and can be installed reliably. Therefore, it can be carried and stored in reserve, and is also easy to wear and handle.

Furthermore, the method for producing a liquid reserve liquid according to the second invention includes the steps described above, and whether the bellows is located in a part of the body of the tank body or the entire body,
It can be easily manufactured. Moreover, since the mold can be used repeatedly, mass production is possible.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a reserve liquid tank according to an embodiment of the present invention, FIG. 2 is a side cross-sectional view showing the reserve liquid tank of the present invention in a state immediately before being attached to a mask cylinder, etc., and FIG. The figure is a side cross-sectional view of the main part showing the state after installation, Figure 4 is a vertical cross-sectional view of the tank body prototype made by injection molding, and Figure 5 is a vertical cross-sectional view of the tank body prototype and mold in blow molding. , and FIG. 6 are longitudinal sectional views of the tank body after blow molding. 1... Reserve liquid tank body, 2... Body, 3
... Bellows, 4... Joint part, 5... Screw part, 7... Packing, 8... Temporary cap, 20...
・Reserve liquid tank prototype, 30, 40, 50・
... Mold, 51... Pressure, compressed air supply hole. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Claims] 1. In a reserve liquid tank containing a replacement liquid,
The main body of the tank is integrally molded from synthetic resin, and part or all of the body of the tank body is formed into a bellows, and a threaded part is provided on the outer periphery of the open joint. A reserve liquid tank whose end is sealed by a gasket glued to the open end and a temporary cap screwed onto the threaded part of the joint part. 2. A cylindrical body made of synthetic resin with one end open is injection molded so as to have a thick part and a thin part in the longitudinal direction, and then the molded cylindrical body is installed in a mold and blow molded, and the above-mentioned 1. A method of manufacturing a reserve liquid tank, characterized in that at least a portion of the thick wall portion is formed into an open threaded portion, and the thin wall portion is formed into a bellows.