JPH044004B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oil filter installed in an oil supply system, and more specifically to an improvement in a suction line filter.

[Conventional technology]

As shown in FIGS. 4 and 5, a conventional oil filter of this type includes a cylindrical filter element 3 housed in a case 2 of a filter body 1, and a cover 4 detachably attached to the case 2. It is composed of.

5 is an oil inlet, 6 is an oil outlet, and the oil outlet 6
A suction pump (not shown) is connected to the side, 7 is a cavity formed above the top surface A for oil supply, and 8 is a space from the oil inlet 5 through the filter element 3 to the oil outlet 6. This is the oil passage.

Reference numeral 9 denotes a safety valve mechanism installed on the upper part of the filter element 3, which is composed of a valve seat part 10 having an outer diameter slightly larger than the inner diameter of the upper opening 3a of the filter element 3, and a valve body part 11.
Three arcuate holes 13 are formed in the valve seat portion 10 on a concentric circle with the cylindrical portion 12 at the center. In addition,
The outer diameter of the arcuate hole 13 is set to be slightly smaller than the inner diameter of the opening 3a of the filter element 3, and the valve body 11 has a disc shape large enough to close the arcuate hole 13. A circular hole 11a that fits into the cylindrical portion 12 is formed.

Then, the valve body part 11 placed on the valve seat part 10 so as to be vertically movable is assembled by screwing the screw 14 inserted from the back side of the valve seat part 10 into the female thread 11b of the valve body part 11, and then A spring 15 interposed between the back surface of the portion 10 and the head of the screw 14 closes the circular arc hole 13 of the valve seat portion 10.

The safety valve mechanism 9 configured as described above is mounted on the upper surface of the filter element 3 via the packing 16, and the cover 4 is fixed with bolts 18 to the upper surface of the cylindrical portion 12 via the cylindrical packing 17. The upper opening 3b of the filter element 3 is fitted with the inner flange 5a of the oil inlet 5 and supported by the bottom of the case 2.

Therefore, the oil inlet 5 is opened by the suction force of the suction pump.
The feed oil flowing from the filter element 3
When passing outward from the center, the oil is filtered by the filter element 3, passes through the oil passage 8, flows out from the oil outlet 6, and is supplied to predetermined hydraulic equipment and the like.

If dirt R adheres to the inner surface of the filter element 3 and the filter element 3 becomes clogged, the internal pressure of the filter element 3 increases, and the valve body 11 is pushed up against the elasticity of the spring 15.

Therefore, the supplied oil in the filter element 3 passes through the circular arc hole 13 of the valve seat 10 and reaches the oil outlet 6, as shown by the broken line arrow. In such a case, after removing the cover 4 and taking out the safety valve mechanism 9 from inside the case 2, the filter element 3 is pulled out upward and cleaned or replaced.

[Problem that the invention seeks to solve]

When the filter element 3 becomes clogged, it is necessary to remove the filter element 3 from the case 2 and replace it with a new one or clean it. Since the lower part (lower opening 3b) of the filter element 3 is opened when it is removed, the dust R attached to the inner peripheral surface of the filter element 3 may fall into the case 2 and contaminate the inside of the case 2. There is a drawback that the dirt R falls into the oil tank from the oil inlet 5 together with the residual oil in the case 2, contaminating the clean oil supply.

[Means for solving problems]

The present invention was made in order to eliminate the drawbacks of the conventional oil filter as described above, and its gist is to provide a case with an oil outlet formed on the upper side and an oil inlet formed in the center of the bottom. The upper opening is closed with a cover, and a valve member having an upright cylindrical part in the center and a safety valve mechanism on the lower outside thereof is removably attached to the oil inlet side, and is disposed in the case. The upper opening of the provided filter element is closed by the lower surface of the cover, and the upright cylindrical part of the valve member is inserted into the lower opening into the filter element to connect the filter element and the upright cylindrical part. An oil filter is characterized in that a rubber reservoir is formed between the oil filter and the oil filter.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in FIGS. 1 and 3. Note that FIG. 1 is a longitudinal sectional view of an oil filter according to the present invention, and FIG. 2 is an exploded perspective view of main components of the oil filter.
FIG. 3 is a partial cross-sectional view showing a state in which the filter element and the valve member are removed from the case.

In the figure, 1 is a filter main body, which includes a cylindrical case 2 with a bottom, a removable cover 3 attached to the upper opening of the case 2, and a cylindrical filter element 4 housed in the case 2. The projection 3a formed at the center of the lower surface of the cover 3 is inserted into the upper opening 4a of the filter element 4, and the lower surface of the cover 3 closes the opening 4a. 21 fixes the cover 3 to the upper opening of the case 2.

Reference numeral 5 denotes an oil inlet formed at the center of the bottom of the case 2. An oil tank (not shown) is connected to the oil inlet 5 side, and an oil outlet formed at the upper side of the case 2. Although not shown, a suction pump is connected to the 6 side. In the figure, reference numeral 7 denotes an oil passage, which is a vacant space extending from the oil inlet 5 to the oil outlet 6 via the outside of the filter element 4.

FIG. 8 shows a valve member installed at the lower part of the filter element 4, and as shown in FIG.
It is comprised of a safety valve mechanism consisting of a disk-shaped valve seat part 9 and a valve body part 10 that project horizontally outward from the lower end of the upright cylindrical part 11.

The valve seat portion 9 has a disk shape with an outer diameter that is approximately the same size as the lower inner diameter of the case 2, and has a seal 9a.
The valve seat 9 has a plurality of circular arc holes 12 (three in the drawing) concentrically with the central upright cylindrical portion 11. A female thread 14 is formed between each arcuate hole 12 and 12, into which a male thread 13a of the guide shaft 13 is screwed.

Further, the valve body part 10 has a disc shape large enough to close the circular arc hole 12, and has a circular hole 15 formed in the center to fit into the upright cylindrical part 11, and a female thread 14 of the valve seat part 9. A through hole 16, through which the guide shaft 13 passes, is formed at a position corresponding to .

The valve body part 10, which is placed on the upper surface of the valve seat part 9 so as to be able to move vertically, screws the male thread 13a of the guide shaft 13 inserted into the through hole 16 into the female thread 14 of the valve seat part 9. together with the valve body part 10 and the guide shaft 1
The circular arc hole 12 of the valve seat portion 9 is closed by a spring 17 interposed between the valve seat portion 3 and the head portion of the valve seat portion 3 .

Furthermore, a ring 18 is fixed to the outer circumference slightly above the upright cylindrical portion 11 of the valve seat portion 9, and a receiving disc 19 fixed to this ring 18 supports the lower surface of the filter element 4. The upper half of the upright cylindrical part 11 is inserted into the lower opening 4b of the filter element 4 and fixed so as to be integrated with the valve seat part 9, and at the same time, A dust trap part 20 is formed between the outer periphery of the upright cylindrical part 11. In addition, 22 in the figure is a detector that detects the clogging state of the filter element 4.

[Effect of the embodiment]

Under normal conditions, supplied oil flows in from the oil inlet 5 due to the suction force of the suction pump, passes through the upright cylindrical portion 11, enters the filter element 4, and is filtered by passing from the center outward. The oil flows out from the oil outlet 6 through the oil passage 7 and is supplied to predetermined hydraulic equipment and the like.

If a large amount of dirt R adheres to the inside of the filter element 4 and the filter element 4 becomes clogged, the oil flow path from the center of the filter element 4 to the oil passage 7 outside thereof is blocked. Therefore, the supplied oil cannot flow into the filter element 4, and the supplied oil that has flowed from the oil inlet 5 flows into the first filter element 4.
As shown by the imaginary line in the figure, the valve body portion 10 is pushed up against the elasticity of the spring 17.

As a result, the supplied oil passes through the circular arc hole 12 of the valve seat part 9 and enters the oil passage 7 as indicated by the broken line arrow, and rises through the oil passage 7 to reach the hemispherical surface 3b formed on the back surface of the cover 3. The oil flows along the line to the oil outlet 6.

In this case, since the total opening area of each arcuate hole 12, 12 formed in the valve seat portion 9 is formed to be approximately the same size as the opening area of the oil inlet 5,
To discharge supplied oil from an oil outlet 6 without placing a large burden on a suction pump.

As described above, when the filter element 4 becomes clogged, the cover 3 is removed, and the upper part of the filter element 4 is grasped and lifted from the upper opening of the case 2.

The filter element 4 and the valve member 8 are removed from the case 2 as a unit, so they are both removed together. During this removal process, the dust R attached to the inner peripheral surface of the filter element 4 is removed. falls downward due to the vibration.

However, since this dust R is stored in the dust collection part 20 between the inner peripheral surface of the filter element 4 and the outer peripheral surface of the upright cylindrical part 11, this dust R is also collected together with the filter element 4 and the valve member 8. It will be discharged outside.

〔Effect of the invention〕

As described above, the oil filter according to the present invention has an oil outlet in the upper side and an oil inlet in the center of the bottom. A valve member having a safety valve mechanism on the lower and outer side thereof is removably attached to the oil inlet side, and the upper opening of the filter element disposed in the case is closed with the lower surface of the cover. In addition, the upright cylindrical part of the valve member is inserted into the lower opening into the inside of the filter element and connected thereto, and a dirt collecting part is formed between the filter element and the upright cylindrical part. Even when cleaning or replacing the filter element, all the dust adhering to the filter element is collected in the dust collecting section, so that it will not fall into the case and will not contaminate the supplied oil.

In addition, when the filter element becomes clogged, the supplied oil does not pass through the filter element, so fresh supplied oil can be sent to the oil outlet without contaminating it, and the entire safety valve mechanism The opening area can be as large as the opening area of the oil inlet, reducing the burden on the suction pump.
It has various effects such as improving the durability of the suction pump.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an oil filter according to the present invention, Fig. 2 is an exploded perspective view of the main components of the oil filter, and Fig. 3 shows the filter element and valve member being removed from the case. A partial cross-sectional view, FIG. 4 is a vertical cross-sectional view of a conventional oil filter,
FIG. 5 is an exploded perspective view of the main components of the oil filter. 1... Filter body, 2... Case, 3...
Cover, 4...Filter element, 4a...
Upper opening, 4b... Lower opening, 5... Oil inlet, 6... Oil outlet, 8... Valve member, 9...
Valve seat part, 10... Valve body part, 11... Upright cylindrical part,
12...Circular hole, 13...Guide shaft, 17...Spring, 20...Dust collecting portion.

Claims (1)

[Claims] 1. A valve member that has an upright cylindrical part in the center and a safety valve mechanism on the outside of the case, in which the upper opening of the case is closed with a cover, which has an oil outlet on the upper side and an oil inlet in the center of the bottom. is removably attached to the oil inlet side, and the upper opening of the filter element disposed in the case is closed by the lower surface of the cover, and the valve member is mounted upright in the lower opening. An oil filter characterized in that a cylindrical part is inserted into the inside of a filter element and connected, and a dirt collecting part is formed between the filter element and the upright cylindrical part.