JPH08164307A - Oil filter - Google Patents

Abstract

PURPOSE: To provide an oil filter whose structure is simple and whose pressure loss during oil bypassing is small. CONSTITUTION: A holding member 3 for holding a filter body 4 in a housing 49 is provided. The holding member 3 sections an inlet chamber 71 on the upstream side of the filter body 4 and an outlet chamber 72 on downstream side thereof, and also has a bypass passage 32 for bypassing. In the bypass passage 32, a relief valve 1 is arranged on the outlet chamber side. The relief valve 1 has a valve disc part 11 having rigidity to close the bypass passage and an energizing part 12 having elasticity to energize the valve disc part in the valve close direction unitedly. When the pressure of oil in the inlet chamber becomes an upper limit or more, the energizing part 12 is deformed to move the valve disc part 11, and thereby the bypass passage 32 is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vehicle internal combustion engine,
The present invention relates to an oil filter used in a device that requires lubrication with oil.

[0002]

2. Description of the Related Art For devices that require oil lubrication,
An oil filter is provided for filtering the oil. The oil filter is provided with a bypass mechanism for bypassing the oil in the inlet chamber to the outlet chamber when the inlet chamber on the upstream side of the filter becomes higher than the upper limit set pressure due to clogging of the filter or the like. There is.

As such a bypass mechanism, for example, as shown in FIG. 9, a cylindrical member 93 for partitioning an inlet chamber 91 and an outlet chamber 92, and a central portion 940 thereof is fixed to the outlet chamber 92 side of the cylindrical member 93. It is known that the C-shaped relief valve 94 is provided with the relief valve 94. The relief valve 94 is made of an elastic plate. The hollow portion inside the cylindrical member 93 constitutes an oil outlet chamber 92, and the outer wall surface thereof constitutes an oil inlet chamber 91. Further, above the cylindrical member 93 and the relief valve 94, a lid body (not shown) for holding the filter body is arranged. The cylindrical member 93 has a relief valve 9
4, the oil in the inlet chamber 91 is put in the outlet chamber 9
A plurality of bypass passages 930 for bypassing to 2 are opened.

[0004]

However, in the above oil filter, the central portion 940 of the relief valve 94 is fixed. Therefore, when the relief valve 94 opens,
The relief valve 94 has a central portion 940 from its free end 941.
The valve opening area decreases as the value approaches. for that reason,
In the bypass passage 930 near the central portion 940, the pressure loss during oil bypass is large.

Further, since the cylindrical member 93 and the relief valve 94 are fixed by the small protrusion 939 of the cylindrical member 93,
Since it is necessary to perform positioning etc. during assembly, the assembly work is complicated and the assembly man-hour increases. Therefore, it is difficult to reduce the cost of the oil filter. Further, in the conventional configuration, since the movable portion of the relief valve 94 is small, it is difficult to secure a sufficient area of the bypass passage.

In view of the conventional problems, the present invention is to provide an oil filter having a simple structure and a small pressure loss at the time of oil bypass.

[0007]

According to the present invention, a filter body for oil filtration, a housing for housing the filter body, and the filter body and a bottom plate of the housing are interposed, and the filter body is held in the housing. A holding member is provided, and the holding member separates an inlet chamber on the upstream side of the filter body and an outlet chamber on the downstream side of the filter body, and a bypass passage for bypassing oil in the inlet chamber to the outlet chamber. The bypass passage is provided on its outlet chamber side with a relief valve that opens when the oil in the inlet chamber exceeds the upper limit set pressure, and the relief valve is provided with the bypass valve. An oil filter is characterized in that a valve body portion having rigidity for closing a passage and an elastic biasing portion for biasing the valve body portion in a valve closing direction are integrally configured.

What is most noticeable in the present invention is that a valve body portion for closing the bypass passage and a biasing portion for biasing the valve body portion in the valve closing direction are integrally provided on the outlet chamber side of the bypass passage. That is, the relief valve that is uniquely provided is disposed.

The relief valve is arranged so as to be movable in a direction parallel to the urging direction of the urging portion. The biasing unit moves the relief valve in the direction opposite to the biasing direction when the oil in the inlet chamber exceeds the upper limit set pressure,
On the contrary, when the pressure is less than the upper limit set pressure, the relief valve is moved in the same direction as the biasing direction.

The urging direction of the urging portion is opposite to the direction of the pressure applied by the oil in the inlet chamber to the relief valve (see FIGS. 6 and 8), or has a constant angle α. (See FIG. 4). The urging force acting in the urging direction can be generated by the urging portion itself being an elastic body or a spring material.

The bypass passage is formed in a holding member which divides the inlet chamber and the outlet chamber. For example, when the holding member has a tubular shape having a hollow portion, the plurality of bypass passages can be arranged along the circumferential direction of the tubular wall surface. At this time, the valve body of the relief valve is
It is formed in an annular shape so that the plurality of bypass passages can be closed. The tubular holding member may have a hollow portion as an outlet chamber and an outer peripheral portion thereof as an inlet chamber.

Further, the holding member not only partitions the inlet chamber and the outlet chamber but also holds the filter body in the housing. For example, it is possible to hold the filter body by providing the holding member with an arm portion having an elastic force and pressing the filter body against the housing by the arm portion.

The inlet chamber communicates with an inlet port opened on the bottom plate, for example. On the other hand, the outlet chamber is in communication with, for example, an outlet formed on the bottom plate. The bottom plate is provided on the bottom of the housing.

The holding member may be interposed between the bottom plate and the filter body, and the relief valve may be interposed between the bottom plate and the holding member. It is preferable that a check valve body for closing the inlet is provided between the holding member and the inlet. This can prevent the oil in the inlet chamber from flowing back from the inlet.

An elastic plate is interposed between the bottom plate and the holding member, and the elastic plate cooperates with the check valve body that closes the introduction port and the valve body portion. It is preferable to integrally have a bypass valve body that closes the bypass passage. Accordingly, the bypass valve body and the check valve body can be configured by one elastic plate, and the structure is simple and the assembly is easy.

[0016]

ACTION AND EFFECT The oil filter of the present invention operates as follows. When the oil in the inlet chamber is less than the set pressure, the urging force of the urging portion is larger than the oil pressure in the inlet chamber, and thus the urging force causes the valve body portion to be pressed toward the bypass passage and closed. There is. Then, all the oil in the inlet chamber is introduced into the filter body. The oil is filtered when passing through the filter body and is discharged to the outlet chamber.

On the other hand, when the oil in the inlet chamber exceeds the upper limit set pressure due to clogging of the filter body or the like, the oil pressure becomes larger than the urging force of the urging portion. Therefore, this oil presses the valve body of the relief valve through the bypass passage. Therefore, the biasing portion is deformed by the oil pressure.

The deformation of the biasing portion moves the valve body portion having rigidity in the direction opposite to the biasing direction. Therefore, a gap is formed between the valve body of the relief valve and the bypass passage,
Oil in the inlet chamber is bypassed to the outlet chamber through the bypass passage and the gap.

Therefore, the oil filter of the present invention can bypass the oil to the outlet chamber when the oil in the inlet chamber exceeds the upper limit set pressure. Furthermore, the valve body is movable in the direction parallel to the biasing direction. Therefore, the relief valve has a simple structure, a large opening area, and a small pressure loss.

According to the present invention, it is possible to provide an oil filter having a simple structure and a small pressure loss at the time of oil bypass.

[0021]

【Example】

Example 1 FIG. 1 shows an oil filter according to an example of the present invention.
This will be described with reference to FIG. The oil filter of this example is shown in FIG.
As shown in FIG. 4, the filter body 4 for oil filtration, a metal housing 49 that houses the filter body 4, and the filter body 4 and the bottom plate 5 of the housing 49 are interposed between the filter body 4 and the filter body 4. And a holding member 3 for holding. The filter body 4 has a cylindrical shape, but one end thereof is closed by a cap 45, and the outer circumference serves as an inlet and the inner circumference serves as an outlet, and is disposed in direct contact with the ceiling portion 490 of the housing 49.

The holding member 3 has a tapered central cylindrical main body, and the central main body has an inlet chamber 71 on the upstream side of the filter body 4 and an outlet chamber 72 on the downstream side of the filter body 4. And are partitioned. Further, in the central main body portion of the holding member 3, a plurality of bypass passages 32 for bypassing the oil in the inlet chamber 71 to the outlet chamber 72 are arranged side by side in the circumferential direction. In the bypass passage 32, the relief valve 1 made of metal is arranged on the outlet chamber 72 side.

The relief valve 1 is, as shown in FIGS. 2 and 3,
A spring steel plate is punched into a predetermined shape and each part is bent into a desired shape. The valve body 11 closes the bypass passage 32, and the valve body 11 is biased in the valve closing direction. The urging portion 12 is integrally formed. The relief valve 1 is an annular body, and a plurality of valve body portions 11 are annularly arranged along the circumferential direction.
Are arranged.

A slit 110 separates the valve bodies 11 from each other. However, each valve body 11 has a width that does not significantly deform under the oil pressure, and is an annular body having sufficient rigidity as a whole. Each valve body 11 is provided at a position corresponding to the plurality of bypass passages 32. The urging portion 12 is an elastic body made of a thin and thin metal plate, and an urging force that urges the annularly arranged valve body portion 11 in the valve closing direction (upward direction) is generated by the elastic force.

That is, as shown in FIGS. 4 and 5, the relief valve 1 is parallel to the urging direction of the urging portion 12 because of the urging portion 12 which is much more easily deformed than the valve body portion 11. It can move freely in any direction (vertical direction). Biasing unit 12
When the oil pressure in the inlet chamber 71 is less than the upper limit set pressure, the relief valve 1 is moved in the biasing direction (upward direction) (FIG. 4).

On the contrary, when the pressure exceeds the upper limit set pressure, the urging portion 12 is contracted and the relief valve 1 moves in the direction opposite to the urging direction (downward) (FIG. 5). The urging direction of the urging portion 12 has a substantially constant angle α with respect to the direction of the oil pressure O given by the oil in the inlet chamber 71 to the relief valve 1 regardless of the moving amount of the valve body portion 11. There is.

As shown in FIG. 1, the holding member 3 has a tubular shape with a main body having a hollow portion, the hollow portion serving as an outlet chamber 72, and the outer peripheral portion serving as an inlet chamber 71. A plurality of bypass passages 3 for bypassing the oil in the inlet chamber 71 to the outlet chamber 72 in the circumferential direction of the cylindrical wall surface of the holding member 3.
The two are aligned. The holding member 3 has an arm portion 31 having an elastic force, as shown in FIG. The arm portion 31 holds the filter body 4 by pressing the filter body 4 against the ceiling portion 490 of the housing 49.

An annular seal portion 37 having a diameter slightly larger than that of the inner wall 41 of the filter body 4 is provided in the upper central portion of the holding member 3. The seal portion 37 presses the inner wall of the filter body 4 in the outer peripheral direction to prevent rattling of the filter body 4 and seals between the holding member 3 and the filter body 4 to prevent unfiltered oil from mixing with the filtered oil. are doing. Further, a plurality of check valve biasing portions 33 for biasing the check valve radially extending from the holding member 3 extend, and the check valve body 2 described later is provided.
3 is urged toward the inlet 50.

At the open end of the housing 49, the holding member 3
A bottom plate 5 for supporting the bottom plate 5 is arranged, and a plate 6 for fixing the bottom plate 5 is caulked and fixed. An inlet port 50 communicating with the inlet chamber 71 is provided in the upper bottom plate 5. On the other hand, the lower plate 6 has an outlet 59 that communicates with the outlet chamber 72. A holding member 3 is interposed between the bottom plate 5 and the filter body 4. The relief valve 1 is interposed between the bottom plate 5 and the holding member 3.

An elastic plate 2 made of rubber is interposed between the holding member 3 and the inlet 50 and the relief valve 1, as shown in FIGS. 1, 4 and 5. As shown in FIG. 4, the elastic plate 2 is interposed between the check valve body 23 that closes the inlet 50 and the valve body portion 11 and the holding member 3 described above, and cooperates with the valve body portion 11. Bypass valve body 2 that closes the bypass passage 32 by
It has 2 and 1 integrally. As a result, the introduction port 50 and the bypass passage 32 can be closed by the single elastic plate 2. In FIG. 1, reference numeral 67 is a seal rubber ring for preventing oil leakage from the engine side block.

Next, the oil filter 40 of this example operates as follows. When the oil in the inlet chamber 71 is less than the set pressure, a slight oil pressure O is generated in the inlet chamber 71 as shown in FIG. This oil pressure O
Acts as a force O ₁ that pushes the valve body 11 inward and opens it, and a force O ₂ that pushes the relief valve 1 downward.

On the other hand, the urging portion 12 provided below the relief valve 1 has an urging force P which acts in the opposite direction (upward direction) to the force O ₂ . When the oil pressure O is less than the upper limit set pressure, the oil pressure O is weak, so the urging force P
Pushes the relief valve 1 in the valve closing direction against the force O ₂ . Therefore, the bypass passage 32 is closed by the valve body portion 11 of the relief valve 1.

All the oil in the inlet chamber 71 is introduced into the filter body 4 and purified when passing through the filter body 4. The purified oil is used in the outlet chamber 7 as shown in FIG.
2 and is returned to the internal combustion engine through the outlet 59.

On the other hand, when the oil in the inlet chamber 71 exceeds the upper limit set pressure due to clogging of the filter body 4 or the like,
As shown in FIG. 5, the force O ₂ ′ of the oil pressure O ′ that pushes the relief valve 1 downward is larger than the urging force P of the urging portion 12. Therefore, the force O ₂ ′ causes the urging portion 12 to be contracted and deformed to move the freely movable relief valve 1 in the direction opposite to the urging direction P (downward). Therefore, a gap 8 is formed between the valve body portion 11 of the relief valve 1 and the bypass passage 32.

The bypass valve body 22 is pressed against the valve body portion 11 by the force O ₁ 'of the oil pressure O'which pushes the valve body portion 11 inward. Therefore, an oil bypass passage that penetrates from the inlet chamber 71 to the outlet chamber 72 is formed between the bypass passage 32 and the gap 8. Therefore, the oil in the inlet chamber 71 is bypassed to the outlet chamber 72 through the oil bypass passage.

Therefore, the oil filter 40 of this embodiment can bypass the oil to the outlet chamber 72 when the oil in the inlet chamber 71 exceeds the upper limit set pressure. Further, the relief valve 1 is freely movable in a direction parallel to the biasing direction. Therefore, the relief valve 1 has no restriction on the valve opening area and can freely move according to the magnitude of the oil pressure O in the inlet chamber 71. Therefore, the oil can be easily bypassed and the pressure loss is small.

Further, since the relief valve 1 is not fixed and can be freely moved, it is not necessary to perform positioning and fixing at the time of assembly unlike the conventional case. Therefore, the oil filter of this example is easy to assemble. In addition, the entrance room 71
The partition between the outlet chamber 72 and the outlet chamber 72 and the holding of the filter body 4 are performed by the holding member 3 of one component. Therefore, the number of parts can be reduced. Also, as shown in FIG. 4, one elastic plate 2
Since the bypass valve element 22 and the check valve 23 are configured by, the structure is simple and the assembly is easy.

Embodiment 2 In the oil filter of this embodiment, as shown in FIGS. 6 and 7, the bypass passage 320 is opened in the upper surface 300 of the cylindrical holding member 30. On the outlet chamber 72 side of the bypass passage 320, the valve body 110 of the relief valve 10 is disposed via the elastic plate 20. Between the valve body portion 110 and the urging portion 12, a connecting portion 1 having a shape along the bottom plate 5 is formed.
19 are provided.

Further, the upper surface 300 of the holding member 30 has a horizontal step-shaped passage opening portion 3 in which the bypass passage 320 is opened.
21 and a protruding portion 322 protruding above the passage opening portion 321. The protruding portion 322 holds the filter body 4 together with the arm portion 31 and the seal portion 37 shown in FIG. Others are the same as in the first embodiment.

In the oil filter of this example, the bypass passage 320 is opened on the upper surface 300 of the holding member 30. The urging force P of the urging portion 12 of the relief valve 10 located below the bypass passage 320 acts in the direction opposite to the oil pressure O applied to the relief valve 10 by the oil in the inlet chamber 71. When the oil in the inlet chamber 71 is less than the set pressure, the urging force P of the urging portion 12 is set as shown in FIG.
Is larger than the oil pressure O in the inlet chamber 71. Therefore, the valve body 110 is pressed in the direction of closing the bypass passage 32.

On the other hand, when the oil in the inlet chamber 71 exceeds the upper limit set pressure, the oil pressure O'becomes larger than the urging force P of the urging portion 12, as shown in FIG. Therefore, the biasing portion 12 is deformed by the oil pressure O ′, and the freely movable relief valve 10 is moved downward in the direction opposite to the biasing direction P. Therefore, the gap 8 is formed between the valve body portion 11 and the bypass passage 32.

As the valve body 11 moves downward, the bypass valve body 220 covering the upper portion of the valve body 11 is also pushed down by the oil pressure O '. Therefore, an oil bypass passage that penetrates from the inlet chamber 71 to the outlet chamber 72 is formed between the bypass passage 320 and the gap 8. Therefore, oil is bypassed to the outlet chamber 72 through the oil bypass passage.

Therefore, also in the oil filter of this embodiment, the relief valve 10 is freely movable in the urging direction of the urging portion 12, so that the pressure loss is small. Further, since the connecting portion 119 has a shape along the plate 5, the relief valve 10
Can move stably and freely along the bottom plate 5. In addition, the same effect as that of the first embodiment can be obtained.

Example 3 In the oil filter of this example, as shown in FIG.
The valve body 111 of the relief valve 100 is formed in an inverted L-shape in cross section along the side wall of the holding member 30 via the elastic plate 20. The bypass passage 320 is provided in the horizontal passage opening portion 321 as in the second embodiment. Others are the same as those in the second embodiment.

In this example, the valve body portion 111 and the urging portion 1
The connecting portion 118 between the two is the side wall 301 of the holding member 30.
It is formed along. Therefore, the effect that the elastic plate 20 is not damaged when the valve body 111 moves can be expected. In addition, the same effect as that of the second embodiment can be obtained. In the above embodiment, the bypass valve body 220 functioning as the relief valve 1 may be provided separately from the check valve body 23 and may be provided on the outer periphery of the row of the annular valve body portions 111 that move in parallel.

In the above-mentioned embodiment, at least a part of the cylindrical holding member that partitions the inlet and the outlet that are concentrically adjacent to each other is formed into a tapered shape or a stepped cylindrical shape, and the tapered portion or annular shape. A large or continuous bypass passage with a large opening is provided in the extracted portion, and an annular valve body portion that collectively closes the bypass passage is provided, and the valve body portion is provided with rigidity that is not deformed by oil pressure. Since the valve body is biased so that it can move in parallel, a large bypass passage area can be secured with a simple configuration. Moreover, since the urging portion for urging the valve body portion is formed of a thin plate integrated with the valve body portion, the structure is simple.

Further, since the member for holding the filter body, the bypass valve body, and the check valve body are concentrated only on the opening end side of the housing only by housing the filter body in the housing, the inlet side and the outlet side are The filter member holding function and the check valve urging function can be integrated into the holding member that partitions the valve, the holding member forms a part of the bypass valve, and the valve body of the bypass valve is integrated with the urging unit. In addition, the check valve and the bypass valve are made of a single rubber plate, and the number of parts is reduced, which simplifies the assembly work.

[Brief description of drawings]

FIG. 1 is a sectional view of an oil filter according to a first embodiment.

FIG. 2 is a plan view of the relief valve according to the first embodiment.

FIG. 3 is a front view of the relief valve according to the first embodiment.

FIG. 4 is an explanatory diagram showing a state in which the bypass passage is closed according to the first embodiment.

FIG. 5 is an explanatory diagram showing a state in which the bypass passage is opened according to the first embodiment.

FIG. 6 is an explanatory diagram showing a state in which the bypass passage is closed according to the second embodiment.

FIG. 7 is an explanatory view showing a state in which the bypass passage is opened according to the second embodiment.

FIG. 8 is an explanatory diagram showing a state in which the bypass passage is closed according to the third embodiment.

FIG. 9 is an explanatory view of a relief valve of a conventional example.

[Explanation of symbols]

 1, 10, 100. . . Relief valve, 11,110. . . Valve body part, 12. . . Biasing unit, 2, 20. . . Elastic plate, 22. . . Bypass valve body, 23. . . Check valve body, 3, 30. . . Holding member, 31. . . Arm part, 32, 320. . . Bypass passage, 33. . . Check valve energizing section, 4. . . Filter body, 40. . . Oil filter, 49. . . Housing, 5. . . Bottom plate, 50. . . Inlet, 59. . . Outlet, 71. . . Entrance room, 72. . . Exit chamber, 8. . . Gap, O, O '. . . Oil pressure, P. . . Biasing force,

Claims (5)

[Claims] 1. A filter body for oil filtration, a housing for housing the filter body, and a holding member interposed between the filter body and a bottom plate of the housing for holding the filter body in the housing. The holding member defines an inlet chamber on the upstream side of the filter body and an outlet chamber on the downstream side of the filter body, and has a bypass passage for bypassing the oil in the inlet chamber to the outlet chamber. ， In the bypass passage,
On the side of the outlet chamber, a relief valve that opens when the oil in the inlet chamber becomes equal to or higher than the upper limit set pressure is provided, and the relief valve is a valve body portion having rigidity that closes the bypass passage. An oil filter comprising an elastic urging portion for urging the valve body in a valve closing direction, which is integrally formed. 2. The holding member according to claim 1, wherein the holding member has a tubular shape having a hollow portion, and a plurality of the bypass passages are arranged on the tubular wall surface along the circumferential direction thereof.
Moreover, the valve body of the relief valve is formed in an annular shape corresponding to the plurality of bypass passages. 3. The bottom plate of the housing according to claim 1, wherein the bottom plate of the housing is provided with an inlet opening communicating with the inlet chamber and an outlet opening communicating with the outlet chamber, and between the bottom plate and the filter body. An oil filter, wherein the holding member is interposed between the bottom plate and the holding member, and the relief valve is interposed between the bottom plate and the holding member. 4. The oil filter according to claim 3, wherein a check valve body for closing the inlet is provided between the inlet of the bottom plate and the holding member. 5. The elastic plate according to claim 4, wherein an elastic plate is interposed between the bottom plate and the holding member, and the elastic plate cooperates with a check valve body that closes the inlet and the valve body portion. An oil filter integrally comprising a bypass valve body which works to close the bypass passage.