JPH05147544A - Oil tank - Google Patents

Abstract

PURPOSE:To simplify the opening structure of a forming mold in forming both upper and lower members with respective forming molds by forming the joining faces of the upper and lower members of a tank main body in a shape to divide, into two upwards and downwards, a pipe connection cylinder for discharge and a pipe connection cylinder for sucking in. CONSTITUTION:A tank main body 2 of synthetic resin is provided with an oil reservoir 3 and a discharge pipe connection cylinder 4 and sucking-in pipe connection cylinder 5 protruding therefrom, and upper and lower members 2A, 2B are welded. The connection faces 2A', 2B' with the upper and lower members 2A, 2B are formed in a shape to divide the cylinders 4, 5 into two. With such a constitution, the opening structure of the forming molds for the upper and lower members 2A, 2B when they are used can be made simple, which reduce the molding cost remarkably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an oil tank,
The tank body is formed by welding upper and lower members made of synthetic resin.

[0002]

2. Description of the Related Art FIG. 10 shows an oil tank 101 used in a hydraulic circuit of a hydraulic power steering system. A tank body 102 made of a synthetic resin has an oil storage portion 10.
3, a discharge pipe connecting cylinder 104 protruding radially outward from the outer peripheral portion of the oil storage portion, and the oil storage portion 103 thereof.
Suction pipe connecting cylinder 10 protruding radially outward from the outer peripheral portion of the
5 and. The oil in the reservoir 103 flows out through the hose 106 connected to the discharge pipe connecting cylinder 104, and the oil flows into the reservoir 103 via the hose 107 connected to the suction pipe connecting cylinder 105.

Conventionally, the tank body 102 made of synthetic resin as described above is formed by welding an upper member 102A and a lower member 102B, and their respective joint surfaces 102A ', 102.
B'is above the connecting tubes 104 and 105.

[0004]

When the lower member 102B of the tank body 102 as described above is molded by using a molding die, it is necessary to mold the hollow connection cylinders 104 and 105. Therefore, the mold of the molding die is used. The open structure is complicated and has been a factor of increasing the molding cost.

An object of the present invention is to provide an oil tank which can solve the above-mentioned problems of the prior art.

[0006]

A feature of the present invention is that an oil storage portion, a discharge pipe connecting cylinder protruding radially outward from an outer peripheral portion of the oil storage portion, and an outer periphery of the oil storage portion. A tank body made of synthetic resin, which is provided with a suction pipe connecting cylinder projecting radially outward from the section, is formed by welding the upper and lower members, and the joint surface of the upper member and the lower member makes each connecting cylinder move up and down. There is a point to divide into two.

[0007]

According to the structure of the present invention, the joint surface between the upper member and the lower member of the synthetic resin tank body divides the discharge pipe connecting cylinder and the suction pipe connecting cylinder into two parts, the upper member and the lower member. When each member is molded by a molding die, the mold opening structure of the molding die can be simplified.

[0008]

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

The oil tank 1 shown in FIGS. 4 to 6 is provided in, for example, a hydraulic circuit of a hydraulic power steering apparatus, and a tank body 2 made of synthetic resin thereof has an oil storage portion 3 and this oil storage. A discharge pipe connecting cylinder 4 protruding radially outward from the outer peripheral portion of the portion 3, and a suction pipe connecting cylinder 5 protruding radially outward from the outer peripheral portion of the oil storage portion 3.
With. The oil in the reservoir 3 flows out from the rubber hose 6 connected to the discharge pipe connecting cylinder 4, and the oil flows into the reservoir 3 from the rubber hose 7 connected to the suction pipe connecting cylinder 5. The ends of the connecting cylinders 4 and 5 have large diameter portions 4a and 5a so that the hoses 6 and 7 are prevented from coming off.

The tank body 2 is formed by welding an upper member 2A and a lower member 2B. The welding is performed by ultrasonic welding or vibration welding, for example. Then, the respective joining surfaces 2A ', 2B' of the upper member 2A and the lower member 2B are
As shown in FIGS. 1 to 3, the discharge pipe connecting cylinder 4 and the suction pipe connecting cylinder 5 are divided into upper and lower parts. In this embodiment, the joining surfaces 2A 'and 2B' pass through the diameters of the connecting tubes 4 and 5, but may be uneven surfaces, for example.

As a result, the upper member 2A and the lower member 2B are
In the case of molding each of them using a molding die, a molding die having a complicated slide structure is not required for molding the connecting cylinders 4 and 5, and the mold opening structure is the simplest one-piece opening structure. Therefore, the molding cost can be significantly reduced.

A fuel filler port 10 is formed in the upper member 2A, and the fuel filler port 10 is provided with a cap 11 with a level gauge 14.
Is opened and closed via the seal 8. A filter 12 for the oil supplied from the oil supply port 10 to the reservoir 3 is provided. The cap 11 is formed by connecting the outer peripheral member 11a and the inner peripheral member 11b.
The level gauge 14 is integrated with the. A leaf spring 15 is attached to the inner peripheral member 11b.
5 is inserted into the tank main body 2 via a notch 17 formed in an inward flange 16 that surrounds the fuel filler opening 10. By rotating the cap 11 after the insertion into the tank main body 2, the inward flange 16 and the seal 8 are sandwiched by the leaf spring 15 and the inner peripheral member 11b, and the fuel supply port 10 is closed.
A peripheral wall 18 is integrally formed with the upper member 2A, and the oil filter 12 is supported by a ring plate 19 welded to the peripheral wall 18.

Inside the lower member 2B, the bottom wall 2 of the lower member 2B is provided.
9, an outer peripheral wall 25 of the lower member 2B, and an inner wall 20 provided inside the lower member 2B.
1 is formed. The inner wall 20 includes an inner wall 22 integrally formed with the lower member 2B, and a filter 13 for the oil flowing from the suction pipe connecting cylinder 5 into the oil storage portion 3.
And the upper wall 23. As shown in FIG. 7, the oil filter 13 is formed by sandwiching a filter main body 13a made of a rectangular synthetic resin mesh with an outer frame 13b and an inner frame 13c made of synthetic resin, and is formed on the inner wall 22. It is fitted in the formed groove 24. The upper wall 23 is integrally formed with the outer frame 13b of the oil filter 13 and welded to the upper surface of the inner wall 22.

The present invention is not limited to the above embodiment. For example, the upper wall 23 is welded to the upper member 2A as shown in FIG. 8, the oil filter 13 is formed in a rectangular shape as shown in FIG. 9, and the oil filter 13 is fixed by welding the upper member 2A and the lower member 2B. You may do it. The present invention can also be applied to oil tanks other than the oil tank for the hydraulic power steering device.

[0015]

According to the oil tank of the present invention, when the upper member and the lower member constituting the tank body made of synthetic resin are respectively molded by the molding die, the mold opening structure of the molding die can be simplified. Therefore, the molding cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a tank body according to an embodiment of the present invention.

FIG. 2 is a plan view of a lower member of the tank body according to the embodiment of the invention.

FIG. 3 is a bottom view of the upper member of the tank body according to the embodiment of the invention.

FIG. 4 is a sectional view of an oil tank according to an embodiment of the present invention.

FIG. 5 is a plan view of an oil tank according to an embodiment of the present invention.

FIG. 6 is a side view of the oil tank according to the embodiment of the present invention.

FIG. 7 is a perspective view of an oil filter according to an embodiment of the present invention.

FIG. 8 is an exploded perspective view of a tank body according to another embodiment of the present invention.

FIG. 9 is a perspective view of an oil filter according to another embodiment of the present invention.

FIG. 10 is a side view of an oil tank according to a conventional example.

[Explanation of symbols]

 2 Tank body 2A Upper member 2B Lower member 3 Oil reservoir 4 Discharge pipe connection cylinder 5 Suction pipe connection cylinder

Claims (1)

[Claims] Claim: What is claimed is: 1. An oil storage part, a discharge pipe connection tube that projects radially outward from the outer peripheral part of the oil storage part, and a suction pipe connection tube that projects radially outward from the outer peripheral part of the oil storage part. An oil tank, characterized in that a tank body made of a synthetic resin, which is provided with, is formed by welding upper and lower members, and a joint surface between the upper member and the lower member divides each connection cylinder into upper and lower parts.