JP2017180225A - Oil filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil filter that can hold a large amount of oil in a housing during stop of an engine and has a simple and small structure and excellent installation performance.SOLUTION: An oil filter 1 includes a housing 3, a filtration element 4 and a support cylinder 5. An oil inlet 11 continuing to an upstream side space S1 on the outer side of the filtration element and an oil outlet 12 continuing to a downstream side space S2 on the inner side of the filtration element are formed on a bottom surface side 3a of the housing. Inside of an erected side 5a of the support cylinder includes: a relief valve 7 for separating the upstream side space and the downstream side space from each other and communicating both of the spaces with each other when a pressure difference between the upstream side space and the downstream side space reaches a set value or larger; and a regulating valve 8 for allowing flowing of oil from the downstream side space S2 toward the oil outlet 12 when the engine is operated and regulating flowing of the oil from the downstream side space S2 toward the oil outlet 12 when the engine is stopped.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil filter, and more particularly to an oil filter that filters engine oil and flows it into an engine lubrication path.

  As a conventional oil filter, one that filters engine oil and flows it into a lubrication path of the engine is generally known (see, for example, Patent Documents 1 and 2). For example, as shown in FIG. 9, the oil filter 101 described in Patent Document 1 is accommodated in a cylindrical housing 103 whose bottom surface side 103 a is attached to the engine and an axial center in the housing 103. And a support cylinder 105 that is raised from the bottom surface 103 a of the housing 103 and supports the inner peripheral side of the filtration element 104. An oil inlet 111 connected to the upstream space S1 outside the filtration element 104 and an oil outlet 112 connected to the downstream space S2 inside the filtration element 104 are formed on the bottom surface 103a of the housing 103. .

  Inside the ceiling 103b of the housing 103, the upstream space S1 and the downstream space S2 are separated from each other, and the differential pressure between the upstream space S1 and the downstream space S2 is set by the clogging of the filtration element 104. A relief valve 107 is provided for communicating the two spaces S1, S2 when the above is reached. Furthermore, an inlet-side check valve 109 that restricts the flow of oil (that is, the reverse flow of oil) from the upstream space S1 to the oil inlet 111 is provided inside the bottom surface side 103a of the housing 103. By providing the check valve 109, the oil OL (indicated by a sand hatch area in FIG. 9) is held in the housing 103 when the engine is stopped, and the oil in the housing 103 flows into the circulation path when the engine is started. Thus, oil out (also referred to as “dry start”) is suppressed. In the oil filter described in Patent Document 2, an inlet check valve and a relief valve made of an elastic material such as rubber are provided inside the bottom surface of the housing.

JP 2003-117316 A Japanese Patent Laid-Open No. 11-6575

  Here, the mounting form of the oil filter 101 to the engine 102 includes upward mounting (see FIG. 10A), lateral mounting (see FIG. 10B), downward mounting (see FIG. 10C), and the like. Can be mentioned. Among these, when the oil filter 101 is mounted downward, a large amount of oil is held in the housing 103 when the engine is stopped. On the other hand, when the oil filter 101 is mounted upward or sideways, the oil in the downstream space S2 or the upstream space S1 in the housing 103 flows to the oil outlet 112 when the engine is stopped, and is thus retained in the housing 103. The amount of oil OL retained is reduced. Therefore, the appearance of an oil filter capable of holding a large amount of oil when the engine is stopped is desired even when the oil filter is mounted upward or horizontally.

  Therefore, an outlet side regulating valve 108 (indicated by a phantom line in FIG. 9) that regulates the flow of oil from the downstream space S2 to the oil outlet 112 when the engine is stopped inside the rising side 105a of the support cylinder 105. ). However, in the conventional oil filter 101, the relief valve 107 is provided inside the ceiling side 103 b of the housing 103, so that the relief valve 107 and the regulating valve 108 are arranged apart from each other in the axial direction of the housing 103. It becomes. For this reason, the number of parts increases, resulting in a complicated and large structure, and the assembly work of the relief valve and the regulating valve becomes complicated.

  The present invention has been made in view of the above situation, and an object thereof is to provide an oil fill that can hold a large amount of oil in a housing when the engine is stopped and that has a simple and small structure and is excellent in assembling. To do.

In order to solve the above-described problem, the invention according to claim 1 includes a cylindrical housing whose bottom side is attached to an engine, a cylindrical filtration element accommodated in the housing with an axial center aligned, A support cylinder that is raised from the bottom surface side of the housing and supports the inner peripheral side of the filtration element, and the bottom surface side of the housing includes an oil inlet that is connected to an upstream space outside the filtration element, and An oil filter in which an oil outlet that is connected to a downstream space inside the filtration element is formed, and the upstream space and the downstream space are isolated inside the rising side of the support cylinder. And a relief valve that allows the upstream space and the downstream space to communicate with each other when a differential pressure between the upstream space and the downstream space exceeds a set value. A regulating valve that sometimes allows oil to flow from the downstream space toward the oil outlet and restricts the oil flow from the downstream space toward the oil outlet when the engine is stopped. This is the gist.
According to a second aspect of the present invention, in the first aspect of the present invention, the relief valve is disposed on the peripheral wall on the rising side of the support cylinder and communicates with the upstream space and the downstream space. A relief valve seat having a hole formed therein, a relief valve body that abuts on the relief valve seat to close the communication hole and is spaced apart from the relief valve seat to open the communication hole; and And a relief spring that biases the valve body toward the relief valve seat.
The invention according to claim 3 is the invention according to claim 2, wherein the relief valve seat is provided in a reduced diameter portion formed on a peripheral wall on the rising side of the support cylinder, and the relief valve The gist of the present invention is that the body is provided so as to be movable in the axial direction within the support cylinder, and the escape spring is provided within the support cylinder.
The gist of the invention of claim 4 is that, in the invention of claim 3, the reduced diameter portion is formed in a tapered shape that is reduced in diameter toward the bottom surface side of the housing.
According to a fifth aspect of the present invention, in the invention according to the third or fourth aspect, the position on the inner side of the rising side of the support tube is farther from the bottom surface side of the housing than the reduced diameter portion in the axial direction An upper lid plate is provided, and the regulating valve is disposed on the upper lid plate and has a regulating valve seat formed with a circulation hole through which oil flows from the downstream space toward the oil outlet. A regulating valve body that contacts the regulating valve seat to close the flow hole and is spaced apart from the regulating valve seat to open the flow hole; and the regulating valve body facing the regulating valve seat. The regulating valve body is provided so as to be movable in the axial direction within the support cylinder, and the regulating spring is provided within the support cylinder. This is the gist.
According to a sixth aspect of the invention, in the fifth aspect of the invention, the relief spring is interposed between the relief valve body and the upper lid plate, and the regulation spring is the regulation spring. The gist is that it is interposed between the valve body and the relief valve body.
According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, an inner side of the bottom surface side of the housing is directed from the oil inlet to the upstream space when the engine is operating. The gist of the invention is that a check valve is provided that allows oil to flow and restricts oil flowing from the upstream space toward the oil inlet when the engine is stopped.

According to the oil filter of the present invention, the upstream side space and the downstream side space are isolated on the inner side of the rising side of the support cylinder, and the differential pressure between the upstream side space and the downstream side space is equal to or greater than the set value. A relief valve that sometimes connects the upstream space and the downstream space, and allows oil to flow from the downstream space to the oil outlet when the engine is operating, and oil that flows from the downstream space to the oil outlet when the engine is stopped And a regulating valve that regulates the distribution of the product. Thereby, when the filtration element is clogged, the upstream side space and the downstream side space are communicated with each other by the relief valve, so that oil shortage during engine operation is prevented. Further, since the flow of oil from the downstream space toward the oil outlet is restricted by the restriction valve when the engine is stopped, a large amount of oil can be held in the housing, and oil shortage at the time of starting the engine is suppressed. Furthermore, since the relief valve and the restriction valve can be arranged close to each other on the inside of the rising side of the support cylinder, the number of parts can be reduced and a simple and compact structure can be achieved, and the relief valve and the restriction valve can be easily assembled. Yes.
Further, when the relief valve includes a relief valve seat, a relief valve body, and a relief spring, the relief valve body abuts on the relief valve seat by the biasing force of the relief spring. While the communication hole is closed, the communication hole is opened by separating the release valve body from the release valve seat against the biasing force of the release spring.
Further, the relief valve seat is provided in a reduced diameter portion formed on a peripheral wall on the rising side of the support cylinder, and the relief valve body is provided so as to be movable in the axial direction within the support cylinder. When the relief spring is provided in the support cylinder, the relief valve and thus the oil filter can be made simpler and more compact, and the ease of assembly of the relief valve is further enhanced.
Further, when the reduced diameter portion is formed in a tapered shape that decreases in diameter toward the bottom surface side of the housing, the relief valve body is smoothly and instantaneously separated from the relief valve seat when the filtration element is clogged. .
Further, an upper lid plate is provided inside the rising side of the support cylinder, and the restriction valve includes a restriction valve seat, a restriction valve body, and a restriction spring, and the restriction valve When the body is provided so as to be movable in the axial direction in the support cylinder and the restriction spring is provided in the support cylinder, the restriction valve body is restricted by the urging force of the restriction spring. While the flow hole is closed by abutting the valve seat, the flow hole is opened by separating the regulating valve body from the regulating valve seat against the biasing force of the regulating spring. Furthermore, the relief valve and the restriction valve can be integrally configured inside the rising side of the support cylinder. Therefore, the oil filter can be made simpler and more compact, and the ease of assembly of the relief valve and the restriction valve can be further improved.
The relief spring is interposed between the relief valve body and the upper lid plate, and the regulation spring is interposed between the regulation valve body and the relief valve body. In this case, the oil filter can be made simpler and more compact, and the assembly of the relief valve and the regulating valve can be further improved.
Furthermore, oil flowing from the oil inlet to the upstream space when the engine is operating is allowed to flow inside the housing on the bottom side, and the oil from the upstream space to the oil inlet when the engine is stopped. When a check valve that restricts the flow of the oil is provided, a large amount of oil can be held between the check valve on the inlet side and the control valve on the outlet side in the housing when the engine is stopped.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is a longitudinal cross-sectional view of the oil filter which concerns on an Example. It is a principal part enlarged view of FIG. It is a disassembled perspective view of the relief valve and restriction valve which concern on an Example. It is an action explanatory view of the above-mentioned oil filter, (a) shows the normal filtration state at the time of engine operation, and (b) shows the clogged state of the filtration element at the time of engine operation. It is action | operation explanatory drawing of the said oil filter, and shows the oil holding state at the time of an engine stop. It is a principal part longitudinal cross-sectional view of the oil filter which concerns on another form. It is a principal part longitudinal cross-sectional view of the oil filter which concerns on another form. It is a principal part longitudinal cross-sectional view of the oil filter which concerns on another form. It is a longitudinal cross-sectional view of the conventional oil filter. It is explanatory drawing of the mounting form of an oil filter, (a) shows upward mounting, (b) shows horizontal mounting, (c) shows downward mounting.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

<Oil filter>
The oil filter according to the present embodiment includes a cylindrical housing (3) whose bottom surface side (3a) is attached to the engine (2), and a cylindrical filtration element (4) accommodated in the housing with its axis aligned. ) And a support cylinder (5) that is raised from the bottom surface side of the housing and supports the inner peripheral side of the filtration element. The bottom surface side (3a) of the housing has an upstream space (outside of the filtration element ( This is an oil filter (1) in which an oil inlet (11) connected to S1) and an oil outlet (12) connected to a downstream space (S2) inside the filtration element are formed (for example, see FIG. 1 and the like). ). The upstream side space (S1) and the downstream side space (S2) are separated from the rising side (5a) of the support cylinder (5), and the differential pressure between the upstream side space and the downstream side space is separated. A relief valve (7) that allows the upstream space and the downstream space to communicate with each other when the set value is exceeded, and allows the oil to flow from the downstream space (S2) to the oil outlet (12) when the engine is operating. In addition, a restriction valve (8) that restricts the flow of oil from the downstream space (S2) toward the oil outlet (12) when the engine is stopped is provided (for example, see FIG. 2 and the like).

  As the oil filter according to the present embodiment, for example, the relief valve (7) is disposed on the peripheral wall on the rising side (5a) of the support cylinder (5), and the upstream space (S1) and the downstream space ( The relief valve seat (31) formed with the communication hole (31a) communicating with S2), and the contact hole is closed by contacting the relief valve seat and spaced from the relief valve seat to open the communication hole. And a relief spring (33) that urges the relief valve body toward the relief valve seat (see, for example, FIG. 2).

  In the case of the above-described embodiment, for example, the relief valve seat (31) is provided in the reduced diameter portion (25) formed on the peripheral wall on the rising side (5a) of the support cylinder (5), The valve body (32) is provided so as to be movable in the axial direction in the support cylinder (5), and the escape spring (33) can be provided in the support cylinder (5) (for example, (See FIG. 2 etc.) In this case, it is preferable that the said diameter reduction part (25) is formed in the taper shape diameter-reduced toward the bottom face side (3a) of a housing (3).

  In the case of the above-mentioned form, for example, the inner lid on the rising side (5a) of the support cylinder (5) has an upper lid at a position further away from the bottom surface side (3a) of the housing than the reduced diameter portion (25) in the axial direction. A plate (26) is provided, and the regulating valve (8) has a flow hole (35a) disposed in the upper lid plate and through which oil flows from the downstream space (S2) toward the oil outlet (12). A regulation valve seat (35) formed, a regulation valve body (36) that contacts the regulation valve seat to close the flow hole and is spaced apart from the regulation valve seat and opens the flow hole; A regulating spring (37) that urges the valve body toward the regulating valve seat, and the regulating valve body (36) is provided so as to be movable in the axial direction within the support cylinder (5). The regulating spring (37) can be provided in the support cylinder (5) (for example, , Reference 2, etc. Figure).

  In the case of the above-described embodiment, for example, the relief spring (33) is interposed between the relief valve body (32) and the upper lid plate (26), and the regulation spring (37) is the regulation valve. The form (for example, refer FIG. 2 etc.) currently interposed between the body (36) and the relief valve body (32) can be mentioned.

  In the case of the above-described embodiment, for example, the release spring (33) is a coil spring, and the regulation spring (37) is a coil spring having a smaller diameter than the release spring, and the inside of the release spring (33). Can be arranged. As a result, the oil filter can be made simpler and more compact, and the ease of assembly of the relief valve and the regulating valve can be further enhanced.

  As an oil filter according to the present embodiment, for example, oil flows from the oil inlet (11) to the upstream space (S1) when the engine is operating, on the inner side of the bottom surface side (3a) of the housing (3). An example is provided that includes a check valve (9) that permits and restricts the flow of oil from the upstream space (S1) toward the oil inlet (11) when the engine is stopped (see, for example, FIG. 2). be able to.

  In addition, the code | symbol in the parenthesis of each structure described in the said embodiment shows the correspondence with the specific structure as described in the Example mentioned later.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In this embodiment, the “oil filter” according to the present invention is exemplified by a spin-on type oil filter that is replaced as a whole including the housing when the filter element is replaced. Furthermore, the oil filter mounted upward with respect to the engine is illustrated.

(1) Configuration of Oil Filter As shown in FIG. 1, the oil filter 1 according to the present embodiment has a cylindrical housing 3 whose bottom surface side 3 a is attached to the engine 2, and an axial center within the housing 3. A cylindrical filtration element 4 to be accommodated, and a support cylinder 5 (also referred to as a “protector”) that is raised from the bottom surface side 3 a of the housing 3 and supports the inner peripheral side of the filtration element 4 are provided. Yes. A relief valve 7 and a regulating valve 8 to be described later are provided inside the rising side 5 a of the support cylinder 5. Furthermore, a check valve 9 described later is provided inside the bottom surface side 3 a of the housing 3.

  Formed on the bottom surface side 3 a of the housing 3 are an oil inlet 11 connected to the upstream space S 1 outside the filtration element 4 and an oil outlet 12 connected to the downstream space S 2 inside the filtration element 4. Specifically, the housing 3 includes a bottomed cylindrical case 14 and a bottom plate 15 that closes the shaft end opening of the case 14. The bottom plate 15 is formed with an oil inlet 12 on the center side thereof. A plurality of oil inlets 11 are formed on the outer peripheral side of the oil inlet 12 of the bottom plate 15 at predetermined intervals along the circumferential direction. Further, on the inner peripheral side of the oil outlet 12, a female screw 12 a is formed in which a male screw formed on the outer peripheral side of a cylindrical oil inlet 2 a provided in the engine 2 is screwed. An annular support plate 16 is joined to the bottom surface of the bottom plate 15. The outer peripheral end side of the support plate 16 is fixed by caulking to the opening end side of the case 14. The support plate 16 is provided with a gasket 17 that seals between the support plate 16 and the engine 2. Further, on the outer peripheral side of the oil outlet 12 on the bottom surface side 3 a of the housing 3, a cylindrical protrusion 18 for mounting a check valve body 42 described later is raised.

  The filtration element 4 is made of filter paper or the like, and is formed in a fold-folded tubular shape (also referred to as “chrysanthemum”). On the shaft end surface side of the filtration element 4, an annular seal member 22 is provided that is in pressure contact with the lid body 21 that is disposed inside the shaft end portion on the ceiling side 3 b of the housing 3. In addition, as the said filtration element 4, you may employ | adopt the cylindrical thing which consists of a nonwoven fabric molded object etc., for example.

  The support cylinder 5 is raised from the bottom surface side 3a of the housing 3 so as to isolate the upstream space S1 and the downstream space S2 by the peripheral wall of the rising side 5a. A large number of through holes 24 are formed in the support cylinder 5 at portions that support the filtration element 4. Further, a check valve element 42 to be described later is attached to the shaft end portion on the rising side 5 a of the support cylinder 5. The filter element 4 is sealed in the housing 3 with the sealing member 22 and the lid body 21 being in pressure contact with each other, and the check valve body 42 and the bottom surface side 3a of the housing 3 are in pressure contact with each other, so Positioned in a held state.

  As shown in FIG. 2, a reduced diameter portion 25 is formed on the peripheral wall on the rising side 5 a of the support cylinder 5. The reduced diameter portion 25 is formed in a tapered shape that decreases in diameter toward the bottom surface side 3 a of the housing 3. Further, an upper lid plate 26 is provided on the inner side of the rising side 5 a of the support cylinder 5 at a position farther in the axial direction from the bottom surface side 3 a of the housing 3 than the reduced diameter portion 25. The upper lid plate 26 is formed in a dish shape having an outer diameter that substantially matches the inner diameter of the support cylinder 5. The upper lid plate 26 is arranged so as to partition the inside of the support cylinder 5 in the axial direction. Further, an annular protrusion 27 is formed on the inner side of the rising side 5 a of the support cylinder 5 at a position corresponding to the arrangement height of the upper lid plate 26. The movement of the upper lid plate 26 in the direction away from the reduced diameter portion 25 in the axial direction of the support cylinder 5 (that is, the direction away from the bottom surface side 3 a of the housing 3) is restricted by the protrusion 27.

  As shown in FIGS. 2 and 3, the relief valve 7 isolates the upstream space S1 and the downstream space S2, and the differential pressure between the upstream space S1 and the downstream space S1 is a set value (for example, 100 kPa) or higher, the upstream space S1 and the downstream space S2 are communicated (see FIG. 4). The relief valve 7 is provided on the peripheral wall of the rising side 5a of the support cylinder 5 and has a relief valve seat 31 in which a communication hole 31a for communicating the upstream space S1 and the downstream space S2 is formed. A relief valve body 32 that abuts the valve seat 31 to close the communication hole 31 a and is spaced apart from the relief valve seat 31 to open the communication hole 31 a, and a relief valve body 32 abuts the relief valve seat 31. And a release spring 33 that biases in the direction.

  The relief valve seat 31 is provided in the reduced diameter portion 25 of the support cylinder 5. A plurality of communication holes 31 a are formed in the relief valve seat 31 at predetermined intervals along the circumferential direction of the reduced diameter portion 25. Further, the relief valve body 32 is arranged in the axial direction on the upper surface side of the reduced diameter portion 25 in the support cylinder 5 (that is, the side farther from the bottom surface side 3a of the housing 3 than the reduced diameter portion 25 in the support cylinder 5). It is provided to be movable. The relief valve body 32 is formed in a dish shape having an outer diameter slightly smaller than the inner diameter of the support cylinder 5. In addition, a circulation hole 32 a through which oil flows from the downstream space S <b> 2 toward the oil outlet 12 in the support cylinder 5 is formed on the center side of the relief valve body 32. Further, the outer peripheral side of the relief valve body 32 is formed in a tapered shape capable of abutting on the reduced diameter portion 25. The escape spring 33 is provided on the upper surface side of the reduced diameter portion 25 in the support cylinder 5. The escape spring 33 is a coil spring and is interposed between the relief valve body 32 and the upper lid plate 26.

  As shown in FIGS. 2 and 3, the restriction valve 8 allows the oil to flow from the downstream space S2 to the oil outlet 12 when the engine is operating, and from the downstream space S2 to the oil outlet 12 when the engine is stopped. This restricts the flow of the oil toward (see FIG. 5). The restriction valve 8 is provided in a restriction valve seat 35 provided with a flow hole 35 a disposed in the upper lid plate 26 and through which oil flows from the downstream space S <b> 2 toward the oil outlet 12, and the restriction valve seat 35. A restricting valve body 36 that closes and closes the flow hole 35a and is spaced apart from the restricting valve seat 35 and opens the flow hole 35a, and a force that pushes the restricting valve body 36 in a direction to contact the restricting valve seat 35. And a regulating spring 37 to be controlled.

  The restriction valve seat 35 is formed with a flow hole 35a on the center side thereof. Further, the regulating valve body 36 is movable in the axial direction on the bottom surface side of the upper lid plate 26 in the support cylinder 5 (that is, the side closer to the bottom surface side 3 a of the housing 3 than the upper lid plate 26 in the support cylinder 5). Is provided. The regulating valve body 36 is formed in an inverted dish shape having an outer diameter smaller than the outer diameter of the relief valve body 32. The regulating spring 37 is provided on the bottom surface side of the upper lid plate 26 in the support cylinder 5. The regulating spring 37 is a coil spring having a smaller diameter than the escape spring 33 and is interposed between the regulating valve body 36 and the relief valve body 32 inside the relief spring 33.

  As shown in FIG. 2, the check valve 9 allows oil to flow from the oil inlet 11 toward the upstream space S1 when the engine is running, and toward the oil inlet 11 from the upstream space S1 when the engine is stopped. The oil distribution is regulated (see FIG. 5). The check valve 9 includes a check valve seat 41 disposed on the outer peripheral portion of the oil inlet 11 on the bottom surface side 3 a of the housing 3, and abuts the check valve seat 41 to close the oil inlet 11. And a check valve body 42 that opens away from the oil inlet 11 while being separated from the check valve seat 41.

  The check valve body 42 is made of an elastic material such as rubber, and is attached so as to cover the annular attachment portion 42 a press-fitted into the outer peripheral side of the protrusion 18 on the bottom surface side 3 a of the housing 3 and the oil inlet 11. And a valve portion 42b extending from the portion 42a to the outer peripheral side. The valve portion 42b is elastically deformed by the oil pressure when the engine is operating and is separated from the check valve seat 41 to open the oil inlet 11. On the other hand, the valve portion 42b is restored to its original shape when the engine is stopped. The oil inflow port 11 is closed by coming into contact with 41. The mounting portion 42 a is attached to the shaft end portion on the rising side 5 a of the support cylinder 5.

  Here, the oil filter 1 is assembled as follows. As shown in FIG. 3, the relief valve body 32 is inserted from the shaft end opening 5 b of the support cylinder 5 and placed on the reduced diameter portion 25 of the support cylinder 5. Next, the relief spring 33, the regulation spring 37, and the regulation valve body 36 are inserted from the shaft end opening 5 b of the support cylinder 5 in an appropriate order or two or more at the same time to escape onto the relief valve body 32. The regulating spring 33 and the regulating spring 37 are placed, and the regulating valve body 36 is placed on the regulating spring 37. Next, the upper lid plate 26 is inserted from the shaft end opening 5 b of the support cylinder 5, and the upper lid plate 26 is moved in a direction approaching the reduced diameter portion 25 in the axial direction of the support cylinder 5 against the urging force of the springs 33 and 37. Press. Thereafter, in the pressed state, the outer peripheral surface of the support cylinder 5 is appropriately pressed with a tool or the like to form a protrusion 27 protruding inward, and the protrusion 27 extends from the reduced diameter portion 25 in the axial direction of the support cylinder 5 of the upper lid plate 26. Restrict movement in the direction of leaving. Thereafter, the oil filter 1 is obtained by attaching the support cylinder 5 supporting the filtration element 4 in the housing 3.

(2) Operation of Oil Filter Next, the operation of the oil filter 1 having the above configuration will be described. In a normal filtration state when the engine is operating (that is, a state where the differential pressure between the upstream space S1 and the downstream space S2 is less than the set value), as shown in FIG. ) Flows into the upstream space S1 in the housing 3 through the oil inlet 11 and passes through the filter element 4 to filter out foreign matters such as dust, and then passes through the through hole 24 of the support cylinder 5. It passes through the downstream space S <b> 2 and flows into the lubrication path of the engine 2 through the flow holes 35 a and 32 a and the oil outlet 12. At this time, in the check valve 9, the check valve body 42 is elastically deformed by the oil pressure, and the oil inlet 11 is opened. Further, in the relief valve 7, the relief valve body 32 abuts on the relief valve seat 31 (the reduced diameter portion 25) by the urging force of the relief spring 33 and the communication hole 31 a is closed. Further, in the regulating valve 8, the regulating valve body 36 is separated from the regulating valve seat 35 (upper lid plate 26) against the urging force of the regulating spring 37 by the oil pressure, and the flow hole 35a is opened.

  On the other hand, in a clogged state of the filtration element 4 during engine operation (that is, a state where the differential pressure between the upstream space S1 and the downstream space S2 is equal to or higher than the set value), as shown in FIG. In the relief valve 7, the relief valve body 32 is separated from the relief valve seat 31 against the urging force of the relief spring 33 due to the oil pressure, and the communication hole 31 a is opened. Therefore, when the engine oil OL flows into the upstream space S1 in the housing 3 through the oil inlet 11, it passes through the communication hole 31a and does not pass through the filtration element 4 (the relief valve body). 32 on the bottom surface side) and flows into the lubrication path of the engine 2 through the oil outlet 12. In the regulating valve 8, the regulating valve body 36 abuts on the regulating valve seat 35 by the urging force of the regulating spring 37 and the flow hole 35 a is closed.

  Further, when the engine is stopped, as shown in FIG. 5, in the check valve 9, the check valve body 42 is restored to its original shape and the oil inlet 11 is closed. Further, in the regulating valve 8, the regulating valve body 36 is brought into contact with the regulating valve seat 35 by the urging force of the regulating spring 37 and the flow hole 35a is closed (see FIG. 2). As a result, a large amount of oil OL (indicated by a sand-like hatching area in FIG. 5) is held between the check valve 9 on the inlet side and the regulating valve 8 on the outlet side in the housing 3.

(3) Effects of the embodiment According to the oil filter 1 of the present embodiment, the upstream space S1 and the downstream space S2 are isolated on the inner side of the rising side 5a of the support cylinder 5 and the upstream space S1 is separated from the upstream space S1. A relief valve 7 that allows the upstream space S1 and the downstream space S2 to communicate with each other when the pressure difference with the downstream space S2 is equal to or greater than a set value, and oil that flows from the downstream space S2 to the oil outlet 12 when the engine is operating. And a regulating valve 8 that regulates the flow of oil from the downstream space S2 toward the oil outlet 12 when the engine is stopped. As a result, when the filter element 4 is clogged, the relief valve 7 allows the upstream space S1 and the downstream space S2 to communicate with each other, so that oil shortage during engine operation is prevented. Further, since the flow of oil from the downstream space S2 to the oil outlet 12 is restricted by the restriction valve 8 when the engine is stopped, a large amount of oil can be held in the housing 3, and oil shortage at the time of engine start is suppressed. . Furthermore, since the relief valve 7 and the restriction valve 8 can be arranged close to each other inside the rising side 5a of the support cylinder 5, the number of parts can be reduced and a simple and compact structure can be achieved, and the relief valve 7 and the restriction valve 8 can be reduced. Can be assembled easily.

  In the present embodiment, the relief valve 7 includes a relief valve seat 31, a relief valve body 32, and a relief spring 33. As a result, the communication valve 31 a is closed by the release valve body 32 coming into contact with the release valve seat 31 by the urging force of the release spring 33, while the release valve against the urging force of the release spring 33. The communication hole 31 a is opened when the body 32 is separated from the relief valve seat 31.

  Further, in the present embodiment, the relief valve seat 31 is provided in the reduced diameter portion 25 formed on the peripheral wall of the rising side 5 a of the support cylinder 5, and the relief valve body 32 is disposed in the support cylinder 5. The escape spring 33 is provided in the support cylinder 5 so as to be movable in the axial direction. As a result, the relief valve 7 and thus the oil filter 1 can be made simpler and more compact, and the assembly of the relief valve 7 is further enhanced.

  In the present embodiment, the reduced diameter portion 25 is formed in a tapered shape that decreases in diameter toward the bottom surface side 3 a of the housing 3. As a result, the relief valve body 32 is smoothly and instantaneously separated from the relief valve seat 31 when the filtration element 4 is clogged.

  In this embodiment, an upper lid plate 26 is provided inside the rising side 5a of the support cylinder 5, and the restriction valve 8 includes a restriction valve seat 35, a restriction valve body 36, and a restriction valve. The regulating valve element 36 is provided so as to be movable in the axial direction within the support cylinder 5, and the regulating spring 37 is provided within the support cylinder 5. As a result, the regulating valve element 36 abuts against the regulating valve seat 35 by the urging force of the regulating spring 37 to close the flow hole 35 a, while the regulating valve 37 resists the urging force of the regulating spring 37. When the body 36 is separated from the regulating valve seat 35, the flow hole 35a is opened. Furthermore, the relief valve 7 and the regulating valve 8 can be integrally configured inside the rising side 5 a of the support cylinder 5. Therefore, the oil filter 1 can be made simpler and more compact, and the assembling property of the relief valve 7 and the regulating valve 8 can be further improved.

  In this embodiment, the relief spring 33 is interposed between the relief valve body 32 and the upper lid plate 26, and the regulation spring 37 is formed between the regulation valve body 36 and the relief valve body 32. Intervened in between. As a result, the oil filter 1 can be made simpler and more compact, and the assembly of the relief valve 7 and the restriction valve 8 can be further improved.

  Further, in this embodiment, the release spring 33 is a coil spring, and the regulation spring 37 is a coil spring having a smaller diameter than the release spring 33 and is disposed inside the release spring 33. As a result, the oil filter 1 can be made simpler and more compact, and the assembly of the relief valve 7 and the restriction valve 8 can be further improved.

  Further, in the present embodiment, the inside of the bottom surface side 3a of the housing 3 allows oil to flow from the oil inlet 11 toward the upstream space S1 when the engine is operating, and flows from the upstream space S1 when the engine is stopped. A check valve 9 for restricting the flow of oil toward the inlet 11 is provided. Thereby, when the engine is stopped, a large amount of oil can be held in the housing 3 between the check valve 9 on the inlet side and the regulating valve 8 on the outlet side.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above-described embodiment, the upper lid plate 26 that is a separate body from the support cylinder 5 is illustrated, but the present invention is not limited thereto, and for example, the upper lid plate 26 that is integrally formed with the support cylinder 5 may be used. For example, as shown in FIG. 6, the support cylinder 5 includes a first cylinder 50 a that rises from the bottom surface side 3 a of the housing 3, and a second cylinder 50 b that is joined to the first cylinder 50 a, and the first cylinder 50 a The diameter-reduced portion 25 constituting the relief valve seat 31 may be formed, and the shaft end surface side of the second cylinder 50b may be used as the upper lid plate 26 constituting the regulating valve seat 35. Even in this case, there are substantially the same operations and effects as the oil filter 1 of the first embodiment.

  Moreover, in the said Example, although the relief valve body 32 which can move to the axial direction of the support cylinder 5 was illustrated, it is not limited to this, For example, the relief which can move to the direction which cross | intersects the axial direction of the support cylinder 5 A valve body may be used. Furthermore, in the said Example, although the valve body 36 for regulation which can move to the axial direction of the support cylinder 5 was illustrated, it is not limited to this, For example, the regulation which can be moved to the direction crossing the axial direction of the support cylinder 5 A valve body may be used.

  Moreover, in the said Example, although the relief valve body 32 urged | biased by the relief spring 33 was illustrated, it is not limited to this, For example, as shown in FIG. 7, for relief which consists of elastic materials, such as rubber | gum The valve body 49 may be used. The relief valve body 49 is elastically deformed by the oil pressure when the differential pressure between the upstream space S1 and the downstream space S2 is equal to or greater than a set value, and is separated from the relief valve seat 31 so as to open the communication hole 31a. On the other hand, when the differential pressure is less than the set value, the original shape is restored and abuts against the relief valve seat 31 to close the communication hole 31a.

  Moreover, in the said Example, although the valve body 36 for regulation urged | biased by the spring 37 for regulation was illustrated, it is not limited to this, For example, as shown in FIG. 7, it is for regulation which consists of elastic materials, such as rubber | gum. The valve body 52 may be used. The regulating valve body 52 is elastically deformed by the oil pressure when the engine is operating and is separated from the regulating valve seat 35 to open the flow hole 35a, while being restored to its original shape when the engine is stopped, the regulating valve seat 35. To close the flow hole 35a.

  Moreover, in the said Example, although the taper-shaped diameter reducing part 25 diameter-reduced toward the axial end side of the support cylinder 5 was illustrated, it is not limited to this, For example, the direction orthogonal to the axial direction of the support cylinder 5 It is good also as a diameter-reduced part extended in. In the above embodiment, the relief valve seat 31 disposed in the reduced diameter portion 25 of the support cylinder 5 is exemplified, but the present invention is not limited to this. For example, as shown in FIG. The relief valve seat 31 disposed in the diameter portion 54 may be used.

  Furthermore, in the said Example, although the spin-on type oil filter 1 was illustrated, it is not limited to this, For example, it is good also as a type of oil filter which does not replace the housing 3 at the time of replacement | exchange of the filtration element 4. FIG. Furthermore, in the said Example, although the oil filter 1 mounted upward with respect to the engine 2 was illustrated, it is not limited to this, For example, it is good also as an oil filter mounted horizontally or downward with respect to an engine.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  The present invention is widely used as an oil filter for filtering engine oil.

  DESCRIPTION OF SYMBOLS 1; Oil filter, 2; Engine, 3; Housing, 3a; Bottom side, 4; Filtration element, 5: Support cylinder, 5a; Startup side, 7: Relief valve, 8: Regulating valve, 9; 11; Oil inlet, 12; Oil outlet, 25; Reduced diameter part, 26; Upper lid plate, 31; Relief valve seat, 31a; Communication hole, 32; Relief valve body, 33; Relief spring, 35; Regulation valve seat, 35a; flow hole, 36; regulation valve element, 37; regulation spring, S1; upstream space, S2; downstream space.

Claims (7)

A cylindrical housing whose bottom side is attached to the engine, a cylindrical filtration element that is accommodated in the housing with its axis aligned, and an inner peripheral side of the filtration element that is raised from the bottom side of the housing A support cylinder for supporting, and an oil inlet that is connected to an upstream space outside the filtration element and an oil outlet that is connected to a downstream space inside the filtration element are formed on the bottom surface side of the housing. An oil filter,
On the inside of the support cylinder on the rising side,
The upstream space and the downstream space are separated from each other, and the upstream space and the downstream space are communicated when a differential pressure between the upstream space and the downstream space becomes a set value or more. A relief valve,
A restriction valve that allows oil to flow from the downstream space toward the oil outlet when the engine is operating, and restricts oil flow from the downstream space toward the oil outlet when the engine is stopped. An oil filter characterized by that.   The relief valve is disposed on a peripheral wall on the rising side of the support cylinder and has a relief valve seat formed with a communication hole that communicates the upstream space and the downstream space, and the relief valve seat A relief valve element that abuts to close the communication hole and is spaced apart from the relief valve seat to open the communication hole, and a relief element that urges the relief valve element toward the relief valve seat The oil filter according to claim 1, further comprising a spring. The relief valve seat is provided in a reduced diameter portion formed on the peripheral wall on the rising side of the support cylinder,
The relief valve body is provided so as to be movable in the axial direction within the support cylinder,
The oil filter according to claim 2, wherein the escape spring is provided in the support cylinder.   The oil filter according to claim 3, wherein the reduced diameter portion is formed in a tapered shape that decreases in diameter toward a bottom surface side of the housing. An inner side of the support cylinder on the rising side is provided with an upper cover plate at a position further away from the bottom side of the housing in the axial direction than the reduced diameter portion,
The restriction valve is disposed on the upper lid plate and is in contact with the restriction valve seat having a flow hole through which oil flows from the downstream space toward the oil outlet and the restriction valve seat. A restriction valve body that closes the flow hole and is spaced apart from the restriction valve seat and opens the flow hole; a restriction spring that biases the restriction valve body toward the restriction valve seat; With
The regulating valve body is provided so as to be movable in the axial direction within the support cylinder,
The oil filter according to claim 3 or 4, wherein the regulating spring is provided in the support cylinder. The escape spring is interposed between the relief valve body and the upper lid plate,
The oil filter according to claim 5, wherein the regulating spring is interposed between the regulating valve body and the relief valve body.   The inside of the bottom surface side of the housing allows oil to flow from the oil inlet to the upstream space when the engine is operating, and allows oil to flow from the upstream space to the oil inlet when the engine is stopped. The oil filter according to any one of claims 1 to 6, further comprising a check valve for restricting circulation.

Images