JPH0110484Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the structure of an oil tank in a hydraulic system, and more specifically, to a filter installed in an oil tank used in a vehicle power steering system, for example. This invention relates to an improvement of the supporting part of the.

[Prior art]

Generally, the configuration of a power steering device includes, for example, as shown in FIG. 1, an oil pump 2 that is rotationally driven by an engine 1, and a steering unit 4 that is connected to the oil pump 2 via a hydraulic oil supply pipe 3a. and an oil tank 5 to which the hydraulic oil discharged from the steering unit 4 is connected via a discharge pipe 3b to purify the hydraulic oil.
When switching the handle operation,
By circulating and supplying hydraulic oil to the steering unit 4, the steering wheel can be operated smoothly.

By the way, the conventional oil tank 5 as mentioned above
As shown in FIG. 2, a hydraulic oil inlet 7 and a hydraulic oil outlet 8 connected to the suction side of the oil pump 2 are provided on the bottom wall surface of the main body 6 made of synthetic resin. A hydraulic oil inlet 10 with a strainer 9 provided at a position corresponding to the outlet 8 is provided on the upper wall surface of the 6, and an opening 7a at a position corresponding to the outlet 7 is provided with a hollow cylindrical pipe. A cap 13 that supports the filter 11 via a spring 12 is detachably provided.

The strainer 9 provided at the injection port 10 is supported by a support 14, and a removable cap 16 is attached to a flange portion 15a constituting the opening 15. Further, grommets 17 are interposed between the upper and lower ends of the filter 11, the protrusion of the inlet 7, and the spring holder 19, respectively.
Prevents leakage of hydraulic oil.

A spring holder 19 is slidably inserted into the flange portion 18 constituting the opening 7a.
The filter 11 is fixed by interposing the cap 2 and tightening and fixing the cap 13.

Note that 20 is a gasket provided on the inner surface of the caps 13 and 16.

[Problems to be solved by the invention] However, in the conventional structure for supporting the filter 11, the spring holder 19 is fitted onto the upper end of the filter 11, and the spring 12 is fitted into the recessed portion of the spring holder 19. Since it was necessary to tighten and fix the cap 13 with the filter 11 and cap 13 fitted,
The installation workability was extremely poor, and the large number of parts led to problems with increased costs.

This invention was devised by focusing on such conventional problems, and has a simple structure, improves the workability of installing the filter and cap, and effectively prevents leakage of hydraulic oil. When the oil pressure inside the filter exceeds the specified value, the pressure moves the filter guide upward to expand the volume inside the filter, and the filter is removed from the gap between the filter guide and the sealing material. To provide a structure of an oil tank in a hydraulic device, which effectively prevents excessive load from acting on a filter by releasing pressure to the outside, and further makes the shape of the oil tank compact.

[Means to solve the problem]

In order to achieve the above object, this invention provides a cylindrical guide part connected to the oil inlet and a lower end guide part connected to the cylindrical opening on the opposite side walls of the oil tank body. A cylindrical filter is inserted between the guide portion and the guide portion with sealing material interposed at both ends.

A filter guide having a concave cross section is removably and slidably attached to the end of the filter inserted into the lower end guide, and the filter guide is configured to close the end opening of the filter. Further, a removable cap is provided in the cylindrical opening, and an engaging member is provided on the inner wall surface of the cap and protrudes from the upper surface of the filter guide at a predetermined gap. This gap is where, when the oil pressure in the filter becomes higher than a specified value, this pressure moves the filter guide until it comes into contact with the engagement member,
As the filter guide moves, the volume inside the filter is expanded, while a minute gap is created between the sealing material and the filter guide.
The pressure is released to the outside of the filter.

[Effect]

To assemble the cylindrical filter provided in the oil tank body configured as described above, sealing material such as a grommet is press-fitted into one end (lower end) of the filter in advance, and the other end (upper end) is press-fitted. ), and a filter guide is detachably and slidably attached to the other end of the filter via the sealing material.

The filter configured as described above is inserted through the opening of the flange until the lower end of the filter comes into close contact with the cylindrical guide portion connected to the oil inlet via the sealing material.

Therefore, the lower end of the filter is tightly sealed within the cylindrical guide part through the sealing material, and the upper end is closed by the filter guide through the sealing material.

In this state, the cap is screwed into the flange of the cylindrical opening to complete the assembly work. A gap is provided.

The assembly work is completed by such an operation, and the cylindrical filter is sealed and closed at the upper and lower ends. Normally, the hydraulic oil is discharged outside the filter in a filtered state, but the filter may become clogged. If this occurs and the oil pressure inside the filter exceeds the specified pressure, that is, when the pressure becomes abnormal, this pressure moves the filter guide until it comes into contact with the engaging member, and the volume inside the filter is expanded. On the other hand, the pressure is released to the outside of the filter through a minute gap between the sealing material and the filter guide.

[Example of idea]

An embodiment of this invention will be described below with reference to FIG. 3 based on the accompanying drawings.

In the following explanation, the same components as those of the conventional example explained in FIGS. 1 and 2 are given the same reference numerals, and the explanation will be omitted.

Figure 3 shows an example in which this invention is applied to a power steering device.
6 is the main body of the oil tank 5; 7 is an inlet connected to the steering unit 4 via the discharge pipe 3b;
11 is a hollow cylindrical filter with one end attached to the inlet 7 side; 13 is fitted to a cylindrical flange portion 18 forming an opening 31 provided on the upper wall side of the tank corresponding to the inlet 7; It is a cap.

An annular guide portion 32 is installed at the bottom of the tank body 6 with a predetermined gap 33 in between and the inlet 7 protruding into the body 6 . This guide part 32
The lower end of the filter 11 is inserted into the inner circumferential surface of the filter 11 through a grommet 17. Grommet 17
is formed into a hollow cylinder shape with a flange 17a at one end,
It is press-fitted into the lower end portion 11a of the filter 11. The grommet 17 (generally a sealing material)
The outer periphery of the tip of the collar 17a is in close contact with the inner periphery of the guide portion 32 for sealing, and the grommet 17
an inner wall surface 17b and an inlet 7 protruding into the main body 6.
An appropriate gap is provided between them.

Also, the upper end portion 11b of the filter 11 is also provided with a flange 17.
A hollow cylindrical grommet 17 with a diameter of 15 mm is press-fitted into the grommet 17, and a cap-shaped filter guide 3 with a concave cross section is mounted on the grommet 17, as shown in FIG.
5 is slidably and watertightly attached. That is, the outer periphery of the collar 17a of the grommet 17 and the inner periphery of the filter guide 35 are pressed against each other to form a seal. Accordingly, it can be said that the upper end of the filter 11 is generally closed in a sealed state by the closing means. This filter guide 35 includes a lower end guide portion 34 extending from the flange portion 18 constituting the opening portion 31.
It is slidably fitted to the inner wall surface of the

By the cylindrical flange part 18 and the guide part 34,
A cylindrical opening 31 is configured.

The grommets 17 provided at the upper and lower ends of the filter 11 prevent the hydraulic oil that has flowed into the filter 11 from leaking.

That is, the outer periphery of the tip of the flange 17a of the grommet 17 and the inner periphery of the guide portion 32 are in close contact and sealed, and the outer periphery of the flange 17a of the grommet 17 and the inner periphery of the filter guide 35 are in pressure contact and sealed. Therefore, the hydraulic oil that has flowed into the filter 11 is prevented from leaking from the abutting portions between the collar 17a of the grommet 17 and the guide portion 32 and filter guide 35.

Further, a cap 13 is provided above the filter guide 35 of the filter 11 inserted into the lower end guide part 34 of the flange part 18, and is detachable from the flange part 18. A member 36 is provided, and an appropriate gap is provided between the inner surface of the cap 13 and the upper surface of the filter guide 35 in the attached state. This gap h is such that a sudden increase in the pressure inside the filter 11 is converted into an axial movement of the filter guide 35, and the volume inside the filter 11 is expanded to prevent excessive pressure from acting on the filter 11. The above-mentioned engaging member 36 has the function of pushing the filter 11 into a predetermined position by the cap 13 and the function of regulating the upper limit position of the filter guide 35.

Next, the assembly work of the filter 11 will be explained.

The filter 11 is assembled in advance as follows before being assembled to the tank 5.

First, the lower end 11a of the hollow cylindrical filter 11
The hollow cylindrical grommet 17 is press-fitted into the upper end 11b of the filter 11.
After press-fitting the cap-shaped filter guide 3
Press in 5. Insert the filter 11 configured in this way from the opening 31 of the flange portion 18,
The lower end 11a of the filter 11 is only partially fitted into the inner peripheral surface of the guide part 32 through the grommet 17 press-fitted therein, and the upper end 11b of the filter 11 is fitted through the filter guide 35 press-fitted therein. Insert until it touches the bottom surface of the guide part 32. In this case, the lower end 11 of the filter 11
The filter 11 is pushed in so that the lower end of the grommet 17 a and the bottom of the tank body facing the grommet 17 are in substantially intimate contact with each other. Next, flange part 1
Screw the cap 13 into the cap 8 to complete the assembly work. In this way, when the cap 13 is completely tightened, the engaging member 3
An appropriate gap h is provided between the lower end of filter guide 6 and the upper end of filter guide 35.

This gap h is such that when the oil pressure in the filter 11 suddenly increases, the filter guide 35
By moving axially along the gap h, the volume within the filter 11 is increased, so that the filter 1
This is necessary to prevent excessive pressure from acting on 1.

That is, when the pressure within the filter 11 rises above a specified value, the pressure acting on the filter guide 35 causes the filter guide 35 to move upward relative to its grommet 17, as is clear from FIG. In any case, this movement is regulated by the engagement member 36.

If the pressure exceeds the specified value, the arrow X in Figure 3
As shown in FIG.
The pressure is reduced by passing out of the filter 11 through the gap between the filter 11 and the outer circumferential surface of the filter 11 .

As a result, at the upper end 11b of the filter 11, there are gaps between the inner circumferential surface of the filter 11 and the outer circumferential surface of the grommet 17, and between the inner circumferential surface of the filter guide 35 and the outer circumferential surface of the collar 17a of the grommet 17, respectively. The lower end 11 of the filter 11 is pressure-sealed, while the lower end 11 of the filter 11 is
In a, the inner circumferential surface of the filter 11 and the outer circumferential surface of the grommet 17 and the inner circumferential surface of the guide portion 32 and the outer circumferential surface of the collar 17a of the grommet 17 are pressure-sealed, respectively, and the inside of the oil tank 5 is sealed. The inside and outside of the filter 11 are reliably sealed.

Further, when a pressure higher than the specified value is generated, the filter guide 35 moves along the gap h, thereby increasing the volume inside the filter 11. 35 and the upper end 11 of the filter 11
It escapes to the outside of the filter 11 through the gap with the outer circumferential surface of b.

Furthermore, as is clear from Fig. 3, the filter 1
Since the filter guide 35 is press-fitted into the upper end 11b of 1, the outer diameter is larger than the lower end 11a.
Therefore, the inner diameter of the flange portion 18 provided substantially coaxially is larger than the inner diameter of the guide portion 32.

Therefore, the workability of inserting the filter 11 from above is extremely good. A tapered surface is formed on the inner diameter portion of the upper end of the guide portion 32 to facilitate the above-mentioned insertion work.

This makes the assembly work easier and improves work efficiency.

Although this invention has been explained using an example of supporting an oil tank used in a power steering device of a vehicle, it is not limited to this and can be applied to general oil tanks (including a wide variety of fluid tanks).

[Effect of idea]

Since this invention is configured as described above, it is possible to support the filter without using a spring as in the conventional case, and it is also possible to securely hold the filter while ensuring sufficient sealing performance. Furthermore, since no spring is used, the cap can be tightened more easily when attaching the filter. Furthermore, since the number of parts is small, costs can be reduced. Furthermore, when cleaning the filter, the filter can be grabbed and taken out in the filter assembly state, which effectively prevents parts from being lost or forgotten to be assembled. In addition, in this invention, the filter guide is removably and slidably attached to the other end of the filter via a sealing material, so if the filter becomes clogged, the oil pressure inside the filter may exceed the specified pressure. , that is, when the pressure becomes abnormal, this pressure moves the filter guide until it comes into contact with the engaging member, and expands the volume inside the filter, while increasing the pressure between the seal material and the filter guide. Since the pressure is released to the outside of the filter through minute gaps, it is possible to effectively prevent excessive pressure from acting on the filter.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an oil tank implemented in a conventional power steering device, FIG. 2 is a sectional view of the conventional oil tank, and FIG. 3 is a sectional view of essential parts of the oil tank according to this invention. 5... Oil tank, 6... Main body, 7... Inlet, 8... Outlet, 10... Inlet, 11... Filter, 13... Cap (closing means), 17...
... Grommet (sealing material), 32, 34... Guide portion, 36... Engagement member.

Claims (1)

[Scope of utility model registration request] A guide part that connects to the oil inlet and a lower end guide part that connects to the opening are provided on opposing side walls of the oil tank body, and a cylindrical cylinder is provided between the two guide parts with sealing material at both ends. A filter having a shape of a shape is inserted, and a filter guide having a concave cross section is provided at the end portion inserted into the lower end guide portion of the filter, the end opening of the filter is closed, and the filter guide is detachably attached via the sealing material. A structure of an oil tank in a hydraulic system, comprising a removable cap provided in the opening, and an engaging member protruding from the inner wall of the cap at a predetermined gap from the upper surface of the filter guide. .