JP2018089555A - Oil filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil filter capable of relieving oil by aiming valve opening pressure even in long-term use, and capable of quickly feeding the relieved oil to respective lubrication object parts of an engine.SOLUTION: This oil filter 1 comprises a housing 2 and a filtration element 3, and an oil inflow port 4 and an oil outflow port 5 are formed in a bottom surface part 2b of the housing. The filtration element is movably provided in the axial direction C of the housing, and an elastic plate 21 is interposed between a ceiling part 2a of the housing and one end side 3a in the axial direction of the filtration element, and the elastic plate forms a sealed space Sc partitioned to an upstream space and a downstream space between an inner wall of the ceiling part of the housing and itself. In mesh-clogging time, the elastic plate is elastically deformed, so that the filtration element forms a communication passage 29 for communicating the upstream space and the oil outflow port by separating the other end side in the axial direction from the bottom surface part of the housing.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an oil filter, and more particularly to an oil filter that filters engine oil and sends it to each lubrication target portion of the engine.

  As a conventional oil filter, it includes a cylindrical housing and a cylindrical filtration element accommodated in the housing with the axial center aligned, and the bottom surface of the housing is connected to the upstream space outside the filtration element. It is generally known that an oil outlet and an oil outlet connected to a downstream space inside the filtration element are formed (see, for example, Patent Documents 1 and 2).

  In Patent Document 1, for example, as shown in FIG. 9, a rubber check valve 113 that restricts the flow of oil from the upstream space Sa toward the oil inlet 104 is provided inside the bottom surface portion 102 b of the housing 102. An oil filter 101 is described in which a relief valve 112 is configured by using a part of the check valve 113. According to the oil filter 101, when the oil pressure in the upstream space Sa becomes higher than the oil pressure in the downstream space Sb when the filtration element 103 is clogged or the like, the relief valve 112 is elastically deformed, A communication path 114 that connects the space Sa and the oil outlet 105 is formed, and a part of the oil in the upstream space Sa is relieved to the oil outlet 105 (see FIG. 9B).

  However, in the oil filter 101 described in Patent Document 1, the relief valve 112 is configured by using a part of the rubber check valve 113. Therefore, the rubber relief is caused by the influence of high-temperature oil due to long-term use. The valve 112 is hardened (that is, deteriorated), and it becomes difficult to operate the relief valve 112 with a target valve opening pressure. Further, when high viscosity oil flows into the housing 102, the check valve 113 may come off from the bottom surface portion 102b of the housing 102.

  Therefore, as a technique for solving the above problem, for example, Patent Document 2 discloses an oil filter 201 in which a relief valve structure 212 is provided inside a ceiling portion 202a of a housing 202 as shown in FIG. Have been described. The relief valve structure 212 is provided integrally with a support body 212a having a relief hole 214, a valve body 212b movable in the axial direction of the filtration element 203 so as to open and close the relief hole 212, and an upper portion of the valve body 212b. A plate 212c, and a coil spring 212d that is interposed between the plate 212c and the valve body 212b and biases the valve body 212b in the direction of closing the escape hole 214 are provided. According to this oil filter 201, when the oil pressure in the upstream space Sa becomes higher than the oil pressure in the downstream space Sb by a predetermined value or more when the filter element 203 is clogged, the valve body 212b becomes the urging force of the coil spring 212d. As a result, the escape hole 214 is opened and a part of the oil in the upstream space Sa is relieved to the oil outlet 205.

Japanese Patent Laid-Open No. 10-277319 JP 2003-117316 A

  However, in the oil filter 201 described in Patent Document 2, since the relief valve structure 212 is disposed inside the ceiling 202a of the housing 202, when the relief valve structure 212 is operated, oil in the upstream space Sa (that is, It takes time for unfiltered oil) to pass through the relief valve structure 212 and to be sent to each lubrication target portion of the engine. Furthermore, the relief valve structure 212 is composed of four parts, that is, a support body 212a, a valve body 212b, a plate 212c, and a coil spring 212d, and has a large number of parts and a complicated and expensive structure.

  The present invention has been made in view of the above situation, and can relieve oil with a target valve opening pressure even in long-term use, and can quickly send the relieved oil to each lubrication target portion of the engine. An object of the present invention is to provide an oil filter having a simple and inexpensive structure.

In order to solve the above problem, the invention described in claim 1 includes a cylindrical housing, and a cylindrical filtration element accommodated in the housing so as to coincide with an axis, and the bottom surface of the housing. The oil filter is formed with an oil inlet connected to an upstream space outside the filtration element and an oil outlet connected to a downstream space inside the filtration element. An elastic plate which is provided so as to be movable in the axial direction and urges the filtration element in a direction away from the ceiling of the housing between the ceiling of the housing and one end of the filtration element in the axial direction The elastic plate is densely partitioned with respect to the upstream space and the downstream space with respect to the inner wall of the ceiling portion of the housing. A space is formed, and when the difference between the oil pressure in the upstream space and the oil pressure in the downstream space is less than a predetermined value, the urging force of the elastic plate causes the filtration element to move in the axial direction. When the oil pressure in the upstream space becomes higher than the oil pressure in the downstream space by the end side abutting against the bottom surface of the housing and sealing with the bottom surface of the housing, the upstream side Due to the oil pressure in the space, the elastic plate is elastically deformed to narrow the sealed space in the axial direction of the housing, so that the other end side in the axial direction of the filtration element is separated from the bottom surface of the housing. The gist is to form a communication path communicating the upstream space and the oil outlet between the bottom surface of the housing.
According to a second aspect of the present invention, in the first aspect of the invention, the filtration element is separated from the bottom surface portion of the housing between the bottom surface portion of the housing and the other end side in the axial direction of the filtration element. The gist is that an elastic body biased in the direction is interposed.
According to a third aspect of the present invention, in the second aspect of the invention, a check valve for restricting the flow of oil from the upstream space toward the oil inlet is assembled inside the bottom surface of the housing. The check valve is made of an elastic material, and includes a support portion that supports one end side of the elastic body, and a contact portion that contacts the other end side in the axial direction of the filtration element.
The invention according to claim 4 is the invention according to claim 2 or 3, wherein the elastic body can be expanded and contracted in an axial direction of the filtration element, and the upstream space and the oil outlet are in an extended state. The gist of the invention is to form an elastic body side communication passage that communicates with each other.
The gist of the invention according to claim 5 is the invention according to claim 4, wherein the elastic body is a coil spring.
According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the elastic plate includes an annular outer abutting portion that abuts against an inner wall of a ceiling portion of the housing, and the outer side. And an annular inner abutting portion that is disposed on the inner side of the abutting portion and abuts on one end side in the axial direction of the filtration element.
The invention according to claim 7 is the invention according to claim 6, wherein the filtration element includes a tubular filter medium, a support cylinder that supports an inner peripheral side of the filter medium and is formed with a plurality of through holes, An upper end plate that covers one end side of the filter medium in the axial direction and that the inner contact portion contacts, and a lower end plate that covers the other end side of the filter medium in the axial direction and has a through hole formed in the center portion The gist is to provide.

According to the oil filter of the present invention, the filtration element is provided so as to be movable in the axial direction of the housing, and the filtration element is placed between the ceiling of the housing and one end side in the axial direction of the filtration element. An elastic plate that is biased in a direction away from the portion is interposed, and the elastic plate forms a sealed space partitioned from the upstream space and the downstream space with the inner wall of the ceiling portion of the housing. When the difference between the oil pressure in the upstream space and the oil pressure in the downstream space is less than a predetermined value, the other end side in the axial direction of the filtration element comes into contact with the bottom surface of the housing by the biasing force of the elastic plate. When the oil pressure in the upstream space becomes higher than the oil pressure in the downstream space by a predetermined value or more, the elastic plate causes the housing to close the sealed space by the oil pressure in the upstream space. The filter element is elastically deformed so as to narrow in the axial direction of the filter element, so that the other end side in the axial direction is separated from the bottom surface portion of the housing and communicates the upstream space and the oil outlet through the bottom surface portion of the housing. Form a passage. As described above, the communication path for oil relief is formed by the movement of the filtration element accompanying the elastic deformation of the elastic plate, so that the relief valve can be used by utilizing a part of the rubber check valve as in the past. Compared to what is configured, oil can be relieved with a target valve opening pressure even in long-term use. Further, since the communication path is formed inside the bottom surface portion of the housing, as compared with the conventional structure in which the relief valve structure is arranged inside the ceiling portion of the housing, the upstream space is formed via the communication path. This oil can be sent quickly to each lubrication target part of the engine. Furthermore, the number of parts can be reduced, and a simple and inexpensive structure can be obtained.
In addition, when an elastic body is interposed between the bottom surface of the housing and the other end side in the axial direction of the filtration element, when the filtration element is clogged, the urging force of the elastic body, The filtering element is smoothly and instantaneously separated from the bottom surface of the housing.
When the check valve is assembled inside the bottom surface of the housing and the check valve is made of an elastic material and includes a support portion and a contact portion, the check valve support portion An elastic body is interposed between the other end side in the axial direction of the filtration element. Therefore, the check valve is pressed by the biasing force of the elastic body, and the check valve is prevented from being detached from the bottom surface of the housing. Further, when the filter element is clogged, the filter element is more smoothly and instantaneously separated from the contact portion of the check valve by the urging force of the elastic body and the elastic force of the check valve.
In addition, when the elastic body is extendable in the axial direction of the filtration element and forms an elastic body side communication path that communicates the upstream space and the oil outlet in an extended state, At the time of clogging or the like, a part of the oil in the upstream space is relieved to the oil outlet through the communication path and the elastic body side communication path without passing through the filtration element.
In addition, when the elastic body is a coil spring, an elastic body side communication path with an appropriate oil flow rate can be easily set.
Further, when the elastic plate includes an outer contact portion and an inner contact portion, the outer contact portion contacts the inner wall of the ceiling portion of the housing to form a sealed space, and the inner contact The portion contacts the one end side in the axial direction of the filtration element, and the filtration element is urged.
Furthermore, when the said filtration element is equipped with a filter medium, a support cylinder, an upper side end plate, and a lower side end plate, the filter element of a simple and cheap structure is employable.

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 (non-relief state) which concerns on an Example. It is a longitudinal cross-sectional view of the said oil filter (relief state). It is a longitudinal cross-sectional view of the principal part of the said oil filter, (a) shows a non-relief state, (b) shows a relief state. It is a longitudinal cross-sectional view of the principal part of the said oil filter, (a) shows a non-relief state, (b) shows a relief state. It is a disassembled perspective view of the principal part of the said oil filter. It is a longitudinal cross-sectional view of the oil filter of another form, shows a non-relief state on the left side from the center line, and shows a relief state on the right side from the center line. It is a longitudinal cross-sectional view of the principal part of the oil filter which concerns on another form, (a) shows a non-relief state, (b) shows a relief state. It is a longitudinal cross-sectional view of the principal part of the oil filter which concerns on another form. It is a longitudinal cross-sectional view of the principal part of the conventional oil filter, (a) shows a non-relief state, (b) shows a relief state. It is a longitudinal cross-sectional view of another conventional oil filter, showing a non-relief state on the left side of the center line and showing a relief state on the right side of the center line.

  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 (2) and a cylindrical filtration element (3) accommodated in the housing so as to coincide with the axis, and the bottom surface portion (2b) of the housing. The oil filter (1) has an oil inlet (4) connected to the upstream space (Sa) outside the filtration element and an oil outlet (5) connected to the downstream space (Sb) inside the filtration element. The filtration element (3) is provided so as to be movable in the axial direction (C) of the housing, and between the ceiling (2a) of the housing and one end side (3a) in the axial direction of the filtration element. Is provided with an elastic plate (21) for biasing the filtration element in a direction away from the ceiling portion of the housing, and the elastic plate is disposed between the inner wall of the ceiling portion of the housing and the upstream space and the downstream space. To form a compartmented enclosed space (Sc) (e.g., see FIG. 1 and FIG. 2). When the difference between the oil pressure in the upstream space (Sa) and the oil pressure in the downstream space (Sb) is less than a predetermined value, the filter element (3) is rotated by its biasing force by the elastic plate (21). The other end side (3b) in the direction comes into contact with the bottom surface portion (2b) of the housing to seal between the bottom surface portion of the housing (for example, see FIG. 1 and the like). Further, when the oil pressure in the upstream space (Sa) is higher than the oil pressure in the downstream space (Sb) by a predetermined value or more, the elastic plate (21) is sealed in the sealed space (Sc) by the oil pressure in the upstream space. Is elastically deformed so as to narrow in the axial direction (C) of the housing, so that the other end side (3b) in the axial direction of the filtration element (3) is separated from the bottom surface of the housing and between the bottom surface of the housing. A communication passage (29) that communicates the upstream space (Sa) and the oil outlet (5) is formed (see, for example, FIG. 2).

  In addition, as said predetermined value (namely, valve opening pressure), 100-150 kPa is mentioned, for example.

  As an oil filter according to the present embodiment, for example, between the bottom surface portion (2b) of the housing and the other end side (3b) in the axial direction of the filtration element, the filtration element (3) is provided from the bottom surface portion of the housing. The form (for example, refer FIG. 4 etc.) with which the elastic body (25) urged | biased in the direction to leave can be mentioned.

  In the case of the above-mentioned form, for example, a check valve (13) for restricting the flow of oil from the upstream space (Sa) to the oil inlet (4) is assembled inside the bottom surface (2b) of the housing. The check valve is made of an elastic material and has a support portion (13c) that supports one end side of the elastic body (25) and an abutting portion (13d) on which the other end side (3b) in the axial direction of the filtration element abuts. ) (See, for example, FIG. 4 and the like).

  In the case of the above-mentioned form, for example, the elastic body (25) can be expanded and contracted in the axial direction (C) of the filtration element, and the upstream space (Sa) and the oil outlet (5) communicate with each other in the expanded state. The elastic body side communication path (26) to be formed can be formed (see, for example, FIG. 4). The elastic body is preferably a coil spring (25) (see, for example, FIG. 5).

  As the oil filter according to the present embodiment, for example, the elastic plate (21) includes an annular outer contact portion (22) that contacts the inner wall of the ceiling portion (2a) of the housing, and an inner side of the outer contact portion. And an annular inner abutting portion (23) that abuts on one end side (3a) in the axial direction of the filtration element (see, for example, FIG. 3).

  In the case of the above-mentioned form, for example, the filtering element (3) supports the tubular filter medium (15) and the inner peripheral side of the filter medium, and a support cylinder (16) in which a plurality of through holes (16a) are formed. And an upper end plate (17) that covers one end side in the axial direction of the filter medium and that the inner contact portion (23) contacts, and a through hole (18a) that covers the other end side in the axial direction of the filter medium and in the center. And a lower end plate (18) formed (see, for example, FIGS. 1 and 2).

  The material, shape, configuration, and the like of the housing, filter medium, support cylinder, upper end plate, lower end plate, elastic plate, elastic body, check valve, and the like are not particularly limited. Furthermore, 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. Moreover, the oil filter mounted upward with respect to an engine is illustrated.

(1) Configuration of Oil Filter As shown in FIGS. 1 and 2, the oil filter 1 according to this embodiment includes a cylindrical housing 2 and a cylindrical shape in which the shaft center C is accommodated in the housing 2. The filtration element 3 is provided. An oil inlet 4 connected to the upstream space Sa outside the filtration element 3 and an oil outlet 5 connected to the downstream space Sb inside the filtration element 3 are formed on the bottom surface 2 b of the housing 2. Further, the bottom surface portion 2 b of the housing 2 is attached to the engine E.

  The housing 2 includes a bottomed cylindrical metal case 7 and a metal bottom plate 8 that closes the shaft end opening of the case 7. The bottom plate 8 is provided with a cylindrical protrusion 9 protruding upward at the center side thereof. A female screw 9 a that is screwed with a union bolt (not shown) provided in the engine E is formed on the inner peripheral side of the protruding portion 9. Further, the inner peripheral side of the protrusion 9 is an oil outlet 5. A plurality of oil inlets 4 are formed at predetermined intervals along the circumferential direction on the outer peripheral side of the oil outlet 5 of the bottom plate 8. An annular metal support plate 10 is joined to the bottom surface of the bottom plate 8 by welding or the like. The outer peripheral end side of the support plate 10 is joined to the opening end side of the case 7 by caulking or the like. Further, a gasket 11 that seals between the support plate 10 and the mounting surface of the engine E is mounted.

  Inside the bottom surface 2b of the housing 2, the oil flow from the oil inlet 4 toward the upstream space Sa is allowed and the oil flow from the upstream space Sa toward the oil inlet 4 (that is, the reverse flow) is restricted. A check valve 13 is assembled. The check valve 13 is made of an elastic material such as rubber, elastomer, or resin. The check valve 13 includes an annular mounting portion 13a mounted on the outer peripheral side of the protruding portion 9, a cover portion 13b extending from the mounting portion 13a in the centrifugal direction and covering the oil inlet 4, and a coil spring described later. 25 is provided with a support portion 13c that supports one end side of 25 and an abutting portion 13d that abuts the other end side 3b of the filtration element 3 in the axial direction (see FIG. 4). The support portion 13 c is disposed on the inner side of the contact portion 13 d in the radial direction of the check valve 13. Further, the support portion 13c is formed in a ring groove shape.

  The check valve 13 allows the oil to flow from the oil inlet 4 toward the upstream space Sa when the cover portion 13b is pushed up by the oil flowing into the housing 2 from the oil inlet 4, while the cover portion The outer peripheral edge side of 13 b abuts against the surface of the bottom surface portion 2 b of the housing 2, thereby restricting the oil flow from the upstream space Sa toward the oil inlet 4.

  The filtration element 3 is provided so as to be movable in the axial direction C of the housing 2. The filtration element 3 includes a filter medium 15, a cylindrical metal support cylinder (also referred to as a “protector”) 16 that supports the inner peripheral side of the filter medium 15 and has a plurality of through holes 16 a formed therein. An upper end plate 17 made of metal that covers one end side in the axial direction of the filter medium 15 and an inner contact portion 23 of an elastic plate 21 to be described later contacts, and the other end side in the axial direction of the filter medium 15 and passes through the center portion. And a metal lower end plate 18 in which holes 18a are formed. The filter medium 15 is made of filter paper or the like, and is formed in a fold-folded cylinder shape (also referred to as “chrysanthemum shape”). Further, a concave portion 17a into which a convex portion 21a of an elastic plate 21 described later is fitted is formed at the center portion of the upper end plate 17. Further, each of the upper end plate 17 and the lower end plate 18 is joined to the shaft end surface side of the filter medium 15 by bonding or the like.

  Between the ceiling 2a of the housing 2 and the upper end plate 17 of the filtration element 3, an elastic plate that biases the filtration element 3 along the axial direction C of the housing 2 in a direction away from the ceiling 2a of the housing 2. 21 is interposed. The elastic plate 21 is made of metal and has a planar circular shape. The elastic plate 21 is disposed on the inner side of the annular outer contact portion 22 that contacts the inner wall of the ceiling portion 2 a of the housing 2 and the outer contact portion 22, and contacts the upper end plate 17 of the filtration element 3. And an annular inner contact portion 23 (see FIG. 3). The outer abutting portion 22 is formed in a longitudinal arc shape that abuts on a corner arc portion of the inner wall of the ceiling portion 2 a of the housing 2. Further, a convex portion 21 a that fits into the concave portion 17 a of the upper end plate 17 is formed at the central portion of the elastic plate 21.

  The elastic plate 21 forms a sealed space Sc with the inner wall of the ceiling part 2 a of the housing 2 by the outer contact part 22 contacting the inner wall of the ceiling part 2 a of the housing 2. The sealed space Sc is a space that is partitioned with respect to the upstream space Sa and the downstream space Sb and into which oil does not flow. Further, the elastic plate 21 has the inner contact portion 23 in contact with the upper end plate 17 of the filtration element 3, so that the filtration element 3 is separated from the ceiling portion 2 a of the housing 2 along the axial direction C of the housing 2. Energized.

  Between the support portion 13c of the check valve 13 and the lower end plate 18 of the filtration element 3, the filtration element 3 is urged along the axial direction C of the housing 2 in a direction away from the bottom surface portion 2b of the housing 2. A coil spring (illustrated as an “elastic body” according to the present invention) 25 is interposed. The coil spring 25 can be expanded and contracted in the axial direction C of the filtration element 3 and forms an elastic body side communication passage 26 that communicates the upstream space Sa and the oil outlet 5 in an expanded state (see FIG. 4). .

  Here, when the difference between the oil pressure in the upstream space Sa and the oil pressure in the downstream space Sb during normal filtration is less than a predetermined value (for example, 100 kPa), as shown in FIG. The lower end plate 18 of the filtration element 3 abuts against the abutment portion 13d of the check valve 13 to seal (ie, keep fluid tight) with the check valve 13 (see FIG. 4A). . On the other hand, when the oil pressure in the upstream space Sa becomes higher than the oil pressure in the downstream space Sb when the filtration element 3 is clogged, as shown in FIG. 2, the oil pressure in the upstream space Sa As a result, the elastic plate 21 is elastically deformed (that is, bent and deformed) so as to narrow the sealed space Sc in the axial direction C of the housing 2 (see FIG. 3B). In other words, in the sealed space Sc, the maximum thickness L1 in the axial direction of the housing 2 is L2 (L2 <L1). As the elastic plate 21 is elastically deformed, the urging force of the coil spring 15 lifts the filtering element 3 so that the lower end plate 18 is separated from the contact portion 13d of the check valve 13. A communication passage 29 is formed between the contact portion 13d and the upstream space Sa and the oil outlet 5 (see FIG. 4B).

(2) Operation of Oil Filter Next, the operation of the oil filter 1 having the above configuration will be described. During normal filtration while the engine E is operating, the filter element 3 is checked by the urging force of the elastic plate 21 with its lower end plate 18 coming into contact with the contact portion 13d of the check valve 13 as shown in FIG. Seal between the valve 13. Therefore, engine oil (indicated by a broken line arrow in the figure) pushes up the cover 13b of the check valve 13 and flows into the upstream space Sa from the oil inlet 4. The oil that has flowed into the upstream space Sa passes through the filter medium 15 to filter out foreign matters such as dust, and then reaches the downstream space Sb through the through hole 16a of the support cylinder 16 and passes through the oil outlet 5. It is sent to each lubrication target part of the engine E.

  On the other hand, when the filter element 3 is clogged in the operating state of the engine E, as shown in FIG. 2, the urging force of the coil spring 15 is accompanied by the elastic deformation of the elastic plate 21 due to the oil pressure in the upstream space Sa. As a result, the lower end plate 18 of the filtration element 3 is separated from the contact portion 13d of the check valve 13 and a communication passage 29 is formed between them, and an elastic body side communication passage 26 is formed in the coil spring 25 itself. . Therefore, a part of the engine oil in the downstream space Sa does not pass through the filtration element 3 but is relieved to the oil outlet 5 through the communication path 29 and the elastic body side communication path 25, and each lubrication target part of the engine E Sent to.

(3) Effects of the Example According to the oil filter 1 of the present example, the filtration element 3 is provided so as to be movable in the axial direction C of the housing 2, and the ceiling part 2 a of the housing 2 and the axial direction of the filtration element 3 are provided. An elastic plate 21 that urges the filtering element 3 in a direction away from the ceiling portion 2a of the housing 2 is interposed between the one end side 3a of the housing 2 and the elastic plate 21 is disposed on the inner wall of the ceiling portion 2a of the housing 2. A closed space Sc partitioned with respect to the upstream space Sa and the downstream space Sb is formed. When the difference between the oil pressure in the upstream space Sa and the oil pressure in the downstream space Sb is less than a predetermined value, the other end side 3b in the axial direction of the filtration element 3 is moved to the housing by the biasing force of the elastic plate 21. When the oil pressure in the upstream space Sa becomes higher than the oil pressure in the downstream space Sb by a predetermined value or more, the upstream space Sa is brought into contact with the bottom surface portion 2b of the housing 2 and sealed with the bottom surface portion 2b of the housing 2. Due to the internal oil pressure, the elastic plate 21 is elastically deformed so as to narrow the sealed space Sc in the axial direction C of the housing 2, so that the other end side 3 b in the axial direction of the filtration element 3 is the bottom surface 2 b of the housing 2. A communication path 29 that communicates the upstream space Sa and the oil outlet 5 is formed between the bottom surface 2b of the housing 2 and the housing 2. As described above, since the oil relief communication passage 29 is formed by the movement of the filter element 3 due to the elastic deformation of the elastic plate 21, as in the prior art, a part of the rubber check valve is used. The oil can be relieved with a target valve opening pressure even in long-term use, compared to a relief valve. Further, since the communication passage 29 is formed inside the bottom surface portion 2b of the housing 2, the communication passage 29 is formed as compared with the conventional case where the relief valve structure is arranged inside the ceiling portion of the housing. Thus, the oil in the upstream space Sa can be quickly sent to each lubrication target portion of the engine E. Furthermore, the number of parts can be reduced, and a simple and inexpensive structure can be obtained.

  In this embodiment, a coil spring 25 is interposed between the bottom surface portion 2 b of the housing 2 and the other end side 3 b in the axial direction of the filtration element 3. Thereby, when the filter element 3 is clogged, the filter element 3 is smoothly and instantaneously separated from the bottom surface portion 2 b of the housing 2 by the biasing force of the coil spring 25.

  In this embodiment, a check valve 13 is assembled inside the bottom surface portion 2b of the housing 2, and the check valve 13 is made of an elastic material, and includes a support portion 13c and a contact portion 13d. Prepare. Accordingly, the coil spring 25 is interposed between the support portion 13c of the check valve 13 and the other end side 3b of the filtration element 3 in the axial direction. Therefore, the check valve 15 is pressed by the urging force of the coil spring 25, and the check valve 13 is prevented from being detached from the bottom surface 2b of the housing 2. Further, when the filtration element is clogged, the filtration element 3 is more smoothly and instantaneously separated from the contact portion 13d of the check valve 13 by the biasing force of the coil spring 25 and the elastic force of the check valve 13.

  Further, in this embodiment, the coil spring 25 can be expanded and contracted in the axial direction C of the filtration element 3 and forms an elastic body side communication passage 26 that communicates the upstream space Sa and the oil outlet 5 in the extended state. . Thereby, when the filtration element 3 is clogged, a part of the oil in the upstream space Sa does not pass through the filtration element 3 but passes through the communication path 29 and the elastic body side communication path 26 to the oil outlet 5. Is done. Furthermore, in this embodiment, by adopting the coil spring 25, it is possible to easily set the elastic body side communication path 26 that provides an appropriate oil flow rate.

  In the present embodiment, the elastic plate 21 includes an outer contact portion 22 and an inner contact portion 23. Accordingly, the outer contact portion 22 contacts the inner wall of the ceiling portion 2a of the housing 2 to form a sealed space Sc, and the inner contact portion 23 contacts the one end side 3a in the axial direction of the filtration element 3. The filter element 3 is energized.

  Further, in the present embodiment, the filtration element 3 includes a filter medium 15, a support tube 16, an upper end plate 17, and a lower end plate 18. Thereby, the filtration element 3 of a simple and cheap structure is employable.

  Furthermore, in this embodiment, a concave portion 17 a into which the convex portion 21 a formed at the central portion of the elastic plate 21 is fitted is formed at the central portion of the upper end plate 17. Thereby, the elastic plate 21 and the filtration element 3 can be easily assembled in the housing 2.

  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 said Example, although the form which interposed the coil spring 25 between the bottom face part 2b of the housing 2 and the other end side 3b of the axial direction of the filtration element 3 was illustrated, it is not limited to this, For example, As shown in FIG. 6, the elastic plate 21 and the one end side 3 a in the axial direction of the filtration element 3 may be joined by bonding or the like without providing the coil spring 25. Even in this case, as the elastic plate 21 is elastically deformed, the filtration element 3 is moved in the axial direction of the housing 2 to form the communication path 29.

  Moreover, in the said Example, although the form which interposes the coil spring 25 between the check valve 13 and the other end side 3b of the axial direction of the filtration element 3 was illustrated, it is not limited to this, For example, FIG. As shown, a coil spring 25 may be interposed between the bottom surface portion 2 b of the housing 2 (specifically, the surface side of the bottom plate 8) and the other end side 3 b in the axial direction of the filtration element 3. .

  Moreover, in the said Example, although the contact part 13d of the check valve 13 and the axial direction other end side 3b of the filtration element 3 were contact | abutted and spaced apart, it was not limited to this, For example, FIG. As shown, the bottom surface 2b of the housing 2 (specifically, the tip end side of the projection 9) and the other end side 3b of the filtration element 3 in the axial direction may be brought into contact with and separated from each other. In this case, it is preferable to provide a seal portion 40 made of an elastic material on the other end side 3 b in the axial direction of the filtration element 3 or the bottom surface portion 2 b of the housing 2.

  Moreover, in the said Example, although the coil spring 25 was illustrated as an elastic body, it is not limited to this, For example, you may employ | adopt a disc spring, a leaf | plate spring, etc. as an elastic body.

  Moreover, in the said Example, although the upper side end plate 17 was provided in the axial direction upper end side of the filter medium 15, and the form which contact | abuts the elastic plate 21 and the upper side end plate 17 was illustrated, it is not limited to this, For example, As shown in FIG. 8, an annular seal portion 31 made of a photocurable resin or the like may be provided on the upper end side in the axial direction of the filter medium 15, and the elastic plate 21 and the seal portion 31 may be brought into contact with each other.

  Moreover, in the said Example, although the lower end plate 18 was provided in the axial direction lower end side of the filter medium 15, and the form which contact | abuts the check valve 13 and the lower end plate 18 was illustrated, it is not limited to this, For example, as shown in FIG. 8, an annular seal portion 32 made of a photo-curing resin or the like may be provided on the lower end side in the axial direction of the filter medium 15 so that the check valve 13 and the seal portion 32 are brought into contact with each other.

  Furthermore, in the said Example, although the oil filter 1 mounted upward with respect to the engine E 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; Housing, 2a; Ceiling part, 2b; Bottom part, 3; Filtration element, 3a; One end side, 3b; The other end side, 4: Oil inlet, 5: Oil outlet, 13; Valve, 13c; support part, 13d; contact part, 15; filter medium, 16; support tube, 17; upper end plate, 18; lower end plate, 21; elastic plate, 22; Abutting portion, 25; coil spring, 26; elastic body side communication path, 29; communication path, Sa; upstream space, Sb; downstream space, Sc;

Claims (7)

An oil inflow port connected to an upstream space outside the filtration element at a bottom surface portion of the housing. And an oil filter in which an oil outlet that is connected to a downstream space inside the filtration element is formed,
The filtration element is provided movably in the axial direction of the housing,
Between the ceiling portion of the housing and the one end side in the axial direction of the filtration element, an elastic plate for biasing the filtration element in a direction away from the ceiling portion of the housing is interposed,
The elastic plate forms a sealed space partitioned with respect to the upstream space and the downstream space between the inner wall of the ceiling portion of the housing,
When the difference between the oil pressure in the upstream space and the oil pressure in the downstream space is less than a predetermined value, the other end side in the axial direction of the filtration element is on the bottom surface of the housing by the biasing force of the elastic plate. To seal between the bottom of the housing,
When the oil pressure in the upstream space becomes higher than the oil pressure in the downstream space by a predetermined value or more, the elastic plate narrows the sealed space in the axial direction of the housing by the oil pressure in the upstream space. The filter element is elastically deformed so that the other end side in the axial direction is separated from the bottom surface portion of the housing and communicates the upstream space and the oil outlet with the bottom surface portion of the housing. An oil filter characterized by forming.   The elastic body which urges | biases the said filtration element in the direction away from the bottom face part of the said housing is interposed between the bottom face part of the said housing and the other end side of the axial direction of the said filter element. Oil filter. A check valve that restricts the flow of oil from the upstream space toward the oil inlet is assembled inside the bottom surface of the housing,
The oil filter according to claim 2, wherein the check valve is made of an elastic material, and includes a support portion that supports one end side of the elastic body, and a contact portion that abuts the other end side in the axial direction of the filtration element. .   4. The oil according to claim 2, wherein the elastic body is extendable in the axial direction of the filtration element, and forms an elastic body side communication path that connects the upstream space and the oil outlet in an extended state. 5. filter.   The oil filter according to claim 4, wherein the elastic body is a coil spring.   The elastic plate includes an annular outer contact portion that contacts the inner wall of the ceiling portion of the housing, and an annular inner surface that is disposed inside the outer contact portion and contacts one end side in the axial direction of the filtration element. An oil filter according to any one of claims 1 to 5, further comprising a contact portion.   The filtration element includes a cylindrical filter medium, a support cylinder that supports the inner peripheral side of the filter medium and has a plurality of through holes formed thereon, covers one end side in the axial direction of the filter medium, and the inner contact portion includes The oil filter according to claim 6, comprising: an upper end plate that abuts; and a lower end plate that covers the other end side in the axial direction of the filter medium and has a through hole formed in the center.

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