JPH0448322Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oil reservoir installed in a power steering hydraulic system.

[Conventional technology]

In general, the power steering hydraulic system has
It is equipped with an oil reservoir as disclosed in Japanese Utility Model Application No. 54-79017, and the oil in this oil reservoir is supplied to the power steering gear box via a hydraulic pump. .

Fig. 4 shows this type of oil reservoir R. In the figure, 1 is an oil inlet, and this oil inlet 1 has an oil strainer to prevent dirt and dust from entering when injecting oil. 3 is installed. Also, filler cap 5 has level gauge 7.
is attached, and when checking the oil level, this level gauge 7 is inserted into the oil inlet 1 to check.

Furthermore, this oil reservoir R includes an oil filter 9 that filters the oil returned from the power steering gear box (not shown) (hereinafter referred to as "return oil"), and the upper end of this oil filter 9 A relief valve 13 is pressed against this portion by a spring 11. When the oil filter 9 becomes clogged, the returned oil pushes up the relief valve 13 and flows into the oil reservoir R.

In addition, 15 in the figure is a ventilation pipe, and this ventilation pipe 15 is provided with an air chamber (not shown) that acts as a breather for the oil reservoir R. Furthermore, the bottom of the oil reservoir R is provided with an air chamber (not shown) that acts as a breather for the oil reservoir R. An oil outlet pipe 17 for sending oil to a pump (not shown) and a return oil introduction pipe 19 for introducing return oil into the oil reservoir R are inserted. Conventionally, this type of hydraulic system has a circuit in which the oil supplied from the oil reservoir R is returned directly from the hydraulic pump to the oil reservoir R, and in the figure, 21 is an oil introduction pipe for such oil. It is.

[Problems to be solved by the invention] However, the oil reservoir R has a complicated structure because it has two filtering means, the oil strainer 3 of the oil inlet 1 and the oil filter 9 of the oil circulation circuit. Also, there was a drawback that the manufacturing cost was high. Furthermore, conventionally, the oil filter 9
A member with good filtration performance is used in the oil strainer 3, but due to manufacturing costs, a member with good filtration performance, such as the oil filter 9, is not used in the oil strainer 3, and as a result, oil contamination during oil injection is avoided. There was a risk that the collected dirt and dust would not be filtered properly.

Therefore, an oil reservoir has been proposed in which the returned oil and the injected oil can be filtered using a common oil filter (Japanese Utility Model Publication No. 135502/1983).

This invention is a proposal for an oil reservoir in which the returned oil and the injected oil are filtered through a common oil filter. It is conceivable to allow oil to flow into an oil reservoir by opening a relief valve provided at the upper end of an oil filter via a spring, as shown in Japanese Patent No. 159111.

However, in the reservoir to which the relief valve is attached, the oil level cannot be inspected because the upper part of the relief valve is closed with a lid. In addition, in order to provide a relief valve, element fittings,
Legs, seat plates, springs, etc. that support the element fittings are required, and the structure is complicated. Also, since the oil filter cannot be pulled out without removing various bolts, it is difficult to replace the oil filter.

[Purpose of invention]

This invention was devised in view of the actual situation,
To provide an oil reservoir which has a simple structure, allows a breather when an oil filter is clogged, allows easy checking of the oil amount, and allows easy replacement of the oil filter.

[Means to solve the problem]

In order to achieve this purpose, the present invention provides a cylindrical oil filter directly below an oil inlet to which a filler cap is detachably attached, and an oil reservoir with an oil inlet pipe that returns to the lower end of the oil filter. The oil filter is characterized in that a relief valve is provided at the upper end of the oil filter via a spring and guided by a level gauge provided on the filler cap.

[Effect]

If a relief valve is installed at the upper end of the oil filter via a spring to guide the leveling valve equipped with a filler cap, the level gauge can be shared, the structure can be simplified, and the oil filter can take a breather when it becomes clogged. , just remove the filler cap with the level gauge installed.
You can easily check the oil level.

Furthermore, by removing the oil cap, the relief valve provided at the upper end of the oil filter can be removed and exposed through the opening in the buff-full plate. Therefore, the oil filter can be easily pulled out using a suitable tool, and the oil filter can be easily replaced.

[Example of idea]

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 3.

In the figure, reference numeral 23 denotes an oil inlet provided on the upper surface of the oil reservoir 25, to which a filler cap 27 is detachably attached. This oil inlet 2
3, a cylindrical oil filter 31 into which the level gauge 29 provided on the filler cap 27 is inserted when the filler cap 27 is attached to the oil inlet 23 is inserted from the bumpy plate 39 at the top of the oil reservoir 25. It is provided over the bottom of the oil reservoir 25.

The oil filter 31 is made of the same material with good filtration performance as the oil filter 9 shown in FIG. 4, and has a relief valve 35 pressed against it by a spring 33 at its upper end.

Further, a return oil introduction pipe 37 for guiding return oil from a power steering gear box (not shown) is attached to the lower end of the oil filter 31 in the lower part of the oil reservoir 25.

The relief valve 35 is guided by a level gauge 29 passing through its center, and is biased by a spring 33 interposed between the relief valve 35 and the filler cap 27. It is provided.

When the oil filter 31 becomes clogged, the returning oil resists the spring force of the spring 33 and enters the relief valve 35 as shown in FIG.
is pushed up in the direction of arrow A, and the returned oil passes through the gap m formed between the oil filter 31 and the relief valve 35, and then passes through the gap m formed between the oil filter 31 and the relief valve 35.
and the oil filter 31.
The oil flows into the oil reservoir 25 through the oil reservoir 25. In other words, you can now take a break.

In addition, inside the oil reservoir 25, there is a thick plate 39 that opens at the upper end of the oil filter 31.
is provided so that when oil is injected from the oil inlet 23, the oil is injected into the oil reservoir 25 via the oil filter 31. Note that a slight gap n is formed between the bulk plate 39 and the oil filter 31, and when the oil filter 31 becomes clogged, the return oil overflowing from the gap m passes through this gap n. The oil flows into the oil reservoir 25.

In addition, in the figure, 41 is the oil reservoir 25.
A vent pipe 43 is attached to an air chamber (not shown) that functions as a breather for the engine, and 43 is an oil outlet pipe that sends oil to the power steering gear box via a hydraulic pump (not shown). A stopper 45 is provided on the level gauge 29 to prevent the relief valve 35 from falling off the level gauge 29 when the filler cap 27 is removed from the oil inlet 23.

Since this embodiment is configured in this way, when oil is injected into the oil reservoir 25, the oil is filtered by the oil filter 31 with good filtration performance as shown in FIG.
injected into the body. After oil is injected, by attaching the filler cap 27 to the oil inlet 23, the relief valve 35 is brought into pressure contact with the upper end of the oil filter 31. In addition, the return oil from the power steering gear box is also filtered by the oil filter 31 and sent to the oil reservoir 25.
I will go back inside. If the oil filter 31 becomes clogged as described above, the third
As shown in the figure, the return oil pushes up the relief valve 35 in the direction of arrow A against the spring force of the spring 33, and the return oil creates a gap m between the oil filter 31 and the relief valve 35.
The oil then flows into the oil reservoir 25 through the gap n formed between the baffle plate 39 and the oil filter 31. Furthermore, when steering, the height of the oil in the oil reservoir 25 changes and air flows in and out of the oil reservoir 25, but the air chamber attached to the ventilation pipe 41 functions as a breather.

In this way, this embodiment eliminates the conventional oil strainer 3 shown in FIG.
Since the oil injected from the power steering gearbox and the oil returned from the power steering gear box are filtered by a single oil filter 31 with good filtering performance, this embodiment requires only one filtering means, which reduces costs. decreased. Furthermore, since the relief valve 35 that operates when the oil filter 31 is clogged is provided in the level gauge 29 that is integrated with the filler cap 27, the level gauge 29 can be shared, simplifying the structure and providing a breather when the oil filter 31 is clogged. In addition, by removing the filler cap 27 from the oil inlet 23, the oil amount can be easily checked using the level gauge 29 provided on the filler cap 27.

In addition, when replacing the oil filter 31,
When the filler cap 27 is removed, the relief valve 35 provided at the upper end of the oil filter 31 opens.
is removed and the oil filter 31 is exposed through the opening of the buttful plate 39, so the oil filter 31 can be easily removed using a suitable tool.
The oil filter 31 can be easily replaced.

[Effect of idea]

As described above, according to the present invention, the structure can be simplified by sharing the level gauge, and it is possible to take a breather when the oil filter becomes clogged.In addition, by removing the oil cap from the oil inlet, the oil level can be checked. is easily done. Further, the oil filter can be easily replaced.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the oil reservoir according to the embodiment of the present invention, Fig. 2 is a cross-sectional view of the oil reservoir showing the oil injection state, and Fig. 3 is a relief valve in case the oil filter becomes clogged. FIG. 4 is a sectional view of a conventional oil reservoir. 23... Oil inlet, 25... Oil reservoir, 27... Filler cap, 29... Level gauge, 31... Oil filter, 33... Spring, 35... Relief valve, 37... Return oil introduction pipe, 41... Ventilation pipe, 43...
oil outlet pipe.

Claims (1)

[Scope of utility model registration request] A cylindrical oil filter is provided directly below the oil inlet to which a filler cap is removably attached, and an oil reservoir is provided with an oil introduction pipe that returns to the bottom end of the oil filter. An oil reservoir characterized in that a relief valve is provided via a spring and is guided by a level gauge provided therein.