JP2015190578A - oil strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small oil strainer capable of ensuring a sufficient filtration area.SOLUTION: An oil strainer 100 includes: an oil storage part including an oil suction part 122 and an oil outflow part 112; a filter 130 provided as a filter material so as to section the space in the oil storage part into a suction part side and an outflow part side, and filtrating oil passing through the oil storage part; and a magnet 140 provided in an inlet side space of the side of the suction part by the filter material in the oil storage part, and capable of moving the inlet side space.

Description

  The present invention relates to an oil strainer that filters and discharges oil sucked from an oil pan.

  The transmission has a structure in which torque is transmitted by metal parts typified by a variator and a gear. In the transmission driving state, sliding occurs between these metal parts, and metal powder is generated. The generated foreign matter such as metal powder accumulates in the oil pan by the flow of oil, and the iron-based foreign matter is collected by a magnet fixed in the oil pan. The foreign matter that could not be captured in the oil pan is captured by the filter material of the oil strainer as the oil is sucked up by the oil pump. In this way, the foreign matter mixed in the oil is removed by filtering the oil sucked up by the oil pump with the oil strainer.

  Here, a magnet is conventionally used as an auxiliary member for capturing foreign matter mixed in the oil sucked up from the oil pan to the oil strainer. The magnet can attract and capture iron-based foreign matter in the oil.

  For example, Patent Document 1 discloses an oil storage device in which a cylindrical magnet is arranged on the outer peripheral side of an oil suction cylinder extending toward the bottom surface of an oil pan. In such an oil storage device, when the oil in the oil pan is sucked up from the oil suction cylinder, the iron foreign matter mixed in the oil passing through the gap between the lower end of the cylindrical magnet and the bottom surface of the oil pan is cylindrical. Efficiently captures and captures magnets.

  Patent Document 2 discloses a hydraulic control apparatus including a strainer that is disposed between a valve body and an oil pan and has a filter medium that filters hydraulic oil sucked from the oil pan. A magnet is fixed to the surface of the hydraulic control device facing the oil pan of the strainer. With this magnet, foreign matter in the hydraulic oil that has flowed into the oil pan is attracted and captured in the oil pan by the magnetic force of the magnet. In addition, when the magnetic force of the magnet also acts on the inside of the strainer, foreign matter such as metal powder contained in the working oil in the strainer can be attracted and captured by the magnetic force of the magnet, and foreign matter in the working oil that has flowed into the oil pan can be removed. It is well captured by the magnetic force of the magnet before reaching the strainer filter medium.

JP 2008-280910 A JP 2011-20879A

  Here, since the filter medium of the oil strainer is not replaced, it is necessary to function normally throughout the full life of the automobile. Since the filtration area capable of trapping foreign matters in the filter medium decreases with use, a large filtration area is required for the filter medium in consideration of the total contamination that occurs. If the filtration area of the oil strainer is reduced, the filter medium inside the oil strainer is completely blocked by the collected foreign matter at the end of life, and the oil pump cannot suck up the oil, leading directly to poor hydraulic characteristics and poor running of the vehicle. To do.

  On the other hand, if the oil strainer is enlarged, a sufficient filtration area can be secured to capture the generated foreign matter, but the transmission case and oil pan for accommodating the oil strainer also need to be enlarged. When the oil pan becomes large, it is necessary to fill with oil that does not cause air sucking, and the weight and fuel consumption of the transmission rebound.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved oil strainer that is small and can secure a sufficient filtration area. It is to provide.

  In order to solve the above-described problem, according to an aspect of the present invention, an oil storage portion including an oil suction portion and an outflow portion, and a space in the oil storage portion are divided into a suction portion side and an outflow portion side. An oil strainer comprising: a filter medium for filtering oil that passes through the oil storage section; and a magnet in the oil storage section that is provided in the input side space closer to the suction section than the filter medium and is movable in the input side space. Is provided.

  According to the present invention, by providing the magnet that moves in the entry side space of the oil storage portion, the foreign matter captured by the filter medium can be adsorbed by the magnetic force of the magnet and removed from the filter medium.

  A rib projecting toward the filter medium side is provided at the peripheral portion of the suction part of the oil storage section, and the distance between the filter medium and the rib is configured to be smaller than the thickness of the magnet. Thereby, it is possible to prevent the magnet from coming out from the suction part.

  The magnet may be formed so that the outer shape is rounded. Thereby, it can avoid damaging a filter medium.

  The magnet may have a recess formed on the surface facing the filter medium. Thereby, since the surface area of the surface facing the filter medium is increased, it is possible to efficiently remove foreign substances from the filter medium. In addition, foreign matter adsorbed from the filter medium is accumulated in the concave portion, so that the foreign matter adsorbed can be prevented from falling from the magnet even when the filter medium and the magnet are rubbed.

  Alternatively, the magnet may have a flange formed on the surface facing the filter medium. Thereby, since the surface area of the surface facing the filter medium is increased, it is possible to efficiently remove foreign substances from the filter medium.

  The oil strainer according to any one of claims 1 to 5, wherein an area of a surface of the magnet facing the filter medium includes a sound absorbing material on a surface opposite to the surface facing the filter medium. Thereby, the contact sound of a magnet and an oil accommodating part can be reduced.

  The shape of the magnet may be determined based on at least one of the shape of the oil container and the amount of foreign matter estimated based on the lifetime of the oil strainer.

  The oil storage portion is formed of a material that does not attract the magnet at least on the entry side space side where the magnet is disposed.

  Such an oil strainer is installed in a vehicle such that the bottom surface of the oil storage portion is substantially parallel to the ground. Thereby, it becomes possible to move the magnets uniformly in the entry side space by gravity generated according to the behavior of the vehicle.

  As described above, according to the present invention, it is possible to provide an oil strainer that is small and can secure a sufficient filtration area.

It is explanatory drawing which shows the mechanism of the foreign material removal by the oil strainer which concerns on embodiment of this invention. It is a disassembled perspective view which shows the structure of the oil strainer which concerns on the same embodiment. It is a fragmentary sectional view of the oil strainer concerning the embodiment. It is a schematic perspective view which shows the movable range of the magnet in an oil strainer. It is explanatory drawing for demonstrating the relationship between the filter in the height direction of an oil strainer, a magnet, and an oil suction part. It is the top view and side view which show one structural example of the magnet which has a flange. It is the top view which shows one structural example of the magnet which has a recessed part, and sectional drawing in an AA cut line. It is a side view which shows one structural example of a magnet provided with a sound-absorbing material.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

<1. Foreign matter removal mechanism>
First, with reference to FIG. 1, a mechanism for removing foreign matter by an oil strainer according to an embodiment of the present invention will be described. FIG. 1 is an explanatory diagram showing a mechanism for removing foreign matter by the oil strainer according to the present embodiment.

  The oil strainer according to the present embodiment includes a magnet movable in the oil strainer, which is provided so as to face the filter medium disposed in the oil strainer from the surface on the oil suction side. The main function of this magnet is to remove foreign substances captured by the filter medium from the filter medium.

  As shown in FIG. 1, when the transmission is driven, sliding occurs between metal parts constituting the transmission, and foreign matter such as metal powder is generated. The generated foreign matter is accumulated in the oil pan by the flow of oil, and iron-based foreign matter is captured by the oil pan magnet fixed in the oil pan. The foreign matter that could not be captured in the oil pan moves from the oil pan to the oil strainer together with the oil by sucking up the oil by the oil pump. Foreign matter mixed in the oil sucked into the oil strainer is captured by the filter medium in the oil strainer.

  Here, as described above, the amount of foreign matter that can be captured by the filter medium in the oil strainer is determined by the remaining filtration area. Conventionally, since the foreign matter trapped by the filter medium is not removed from the filter medium, the filtration area has been decreasing with use. Here, the ratio of iron-based foreign matter among foreign matters mixed in oil is large. Therefore, in the oil strainer according to the present embodiment, paying attention to the fact that iron is a ferromagnetic body that is attracted to the magnet, a magnet that moves in the oil strainer is provided, and the iron-based foreign matter captured by the filter medium is adsorbed by the magnet. Remove from the filter media. Thereby, it becomes possible to make the filter medium of the area | region which has caught the foreign material function again.

  For example, when iron-based foreign matter is more than 70% of all foreign matters mixed in the oil, removing the iron-based foreign matter trapped in the filter medium causes about 70% of the filtration area of the filter medium to function again. Is possible. That is, the filtration area of the oil strainer can be reduced by about 70%.

  As described above, the oil strainer according to the present embodiment captures foreign matter floating in the oil by the filter medium, and adsorbs the foreign matter captured by the filter medium by the magnet and removes it from the filter medium. As a result, the filter medium only needs to have a filtration area equivalent to the filtration area when the full life of an automobile is assumed, minus the area that can be cleaned by removing foreign matter with a magnet, and is smaller than conventional oil strainers. Can be realized. In addition to removing foreign matter trapped by the filter medium, this magnet can also attract and trap foreign matter floating in the oil. Hereinafter, the configuration of the oil strainer according to the present embodiment will be described in detail.

<2. Oil Strainer Configuration>
[2-1. overall structure]
First, based on FIGS. 2-5, the whole structure of the oil strainer 100 which concerns on this embodiment is demonstrated. FIG. 2 is an exploded perspective view showing the configuration of the oil strainer 100 according to the present embodiment. FIG. 3 is a partial cross-sectional view of the oil strainer 100 according to the present embodiment. FIG. 4 is a schematic perspective view showing a movable range of the magnet 140 in the oil strainer 100. FIG. 5 is an explanatory diagram for explaining the relationship among the filter 130, the magnet 140, and the oil suction portion 122 in the height direction of the oil strainer 100.

  As shown in FIG. 2, the oil strainer 100 according to the present embodiment includes an upper body 110, a lower body 120, a filter 130, and a magnet 140. The upper body 110 and the lower body 120 constitute an oil storage portion that stores the oil sucked from the oil suction portion 122. The filter 130 and the magnet 140 are provided in the oil container.

(Oil storage part)
The oil storage section includes a lower body 120 on the oil suction section 122 side through which oil sucked up by an oil pump (not shown) is sucked, and an upper body 110 on the oil outflow section 112 side that discharges oil from the oil storage section. It consists of. The upper body 110 and the lower body 120 each have a shape protruding in a direction to be separated from each other from the facing surface side, and form a space for storing oil by joining the peripheral edge portions. In addition, the shape of the oil accommodating part comprised by the upper body 110 and the lower body 120 is determined suitably by the vehicle model mounted, and is not limited to a specific shape.

  The oil suction part 122 of the lower body 120 and the oil outflow part 112 of the upper body 110 are provided as far apart as possible. Normally, the oil strainer 100 is installed in a vehicle so that the oil outflow portion 112 is in front of the vehicle and the bottom surface (that is, the bottom surface 121 of the lower body 120) is substantially parallel to the ground when the vehicle is stopped. In addition, a rib 124 that protrudes toward the inner space side of the oil storage portion is formed at the peripheral portion of the oil suction portion 122. The rib 124 is formed to prevent the magnet 140 in the oil strainer 100 from coming out of the oil suction portion 122 to the outside.

  Further, the lower body 120 is formed of a material that does not attract the magnet 140 such as a resin so that the magnet 140 does not attract. The material of the upper body 110 is not particularly limited, but may be generated from a resin or the like as with the lower body 120.

(filter)
The filter 130 is a filter medium that captures foreign matters mixed in the oil sucked into the oil strainer 100. As shown in FIG. 2, the filter 130 includes a frame 132, a beam portion 134, and a filter portion 138.

As shown in FIG. 3, the frame 132 is a frame formed so as to be in contact with the inner surface of the space formed by the upper body 110 and the lower body 120. A plurality of beam portions 134 are provided. Note that the beam portion 134, the supporting member for holding the exit-side space V _U between the filter 130 and the upper body 110 (not shown.) May have provided a plurality. The support member may be provided inside the upper body 110.

  In addition, a filter unit 138 is provided inside the frame 132 for capturing foreign matters mixed in the oil. For example, stainless steel mesh or non-woven fabric can be used for the filter unit 138. The filter portion 138 has a plurality of holes having a size that allows oil to pass through but does not allow foreign matter to pass through. The size of the hole of the filter unit 138 is determined according to the particle size of the foreign matter to be captured. The filter unit 138 is provided so as to cover the entire inner surface of the frame 132.

The filter 130 according to the present embodiment is provided between the upper body 110 and the lower body 120 as shown in FIGS. 1 and 2, and the internal space of the oil storage portion is used as the entry side space V _L on the lower body 120 side. and divided into the left side space V _U of the upper body 110 side. Thus, the oil sucked from the oil suction unit 122 is moved to the left side space V _U through the filter 130 from the inlet-side space V _L, and flows out from the oil outlet portion 112 of the upper body 110.

(magnet)
The magnet 140 is provided in the entry side space _VL between the filter 130 and the lower body 120 in the oil storage portion, and functions as a member that adsorbs foreign matter captured by the filter 130 and purifies the filter 130. As shown in FIGS. 2 to 4, the magnet 140 is placed on the bottom surface 121 of the lower body 120. The magnet 140 receives the acceleration and deceleration of the vehicle on the bottom surface 121 and the gravity during left and right turns and enters the entry side space V _L. To play. That is, the magnet 140 is not fixed to the lower body 120 and can move freely in the entry side space _VL .

  The magnet 140 is formed in a substantially flat plate shape, and is provided so that two plane portions face the filter 130 and the bottom surface 121 of the lower body 120, respectively. As shown in FIG. 2, the magnet 140 according to the present embodiment is formed in an annular shape through which the central portion of the disk passes. The outer shape of the magnet 140 is preferably a shape with no acute angles and rounded corners so as not to damage the filter 130 and the lower body 120.

Here, the surface of the magnet 140 on the filter 130 side is an upper surface 142, and the surface opposite to the upper surface 142 is a lower surface 144. As shown in FIG. 5, the upper surface 142 of the magnet 140 is close to the filter 130, which are spaced by a distance _{d 1.} The distance _{d 1} may be, for example several mm. By bringing the upper surface 142 of the magnet 140 and the filter 130 close to each other, foreign matter captured by the filter 130 by the magnet 140 can be effectively removed. Since oil is present in the oil strainer 100, the magnet 140 is actually idled in a space filled with oil. Therefore, the magnet 140 moves greatly in the plane direction while moving in the vertical direction (that is, the height direction) slightly in the height direction in the entry side space _VL depending on the behavior of the vehicle.

When the magnet 140 moves in the entry side space _VL due to the behavior of the vehicle, the iron-based foreign matter out of the foreign matter captured by the filter unit 138 is moved when the magnet 140 passes near the foreign matter. It is attracted to the upper surface 142 of the magnet 140 by the magnetic force. Thereby, the foreign substance is removed from the filter part 138, and the filter 130 is purified.

  In consideration of such a function of the magnet 140, foreign matters can be efficiently removed from the filter 130 by increasing the surface area of the upper surface 142 facing the filter 130. On the other hand, since the filter 130 is arranged in a plane so as to partition the internal space of the oil storage portion, it is desirable that the magnet 140 can move to every corner of the surface of the filter 130. Here, since the shape of the lower body 120 is determined according to a vehicle type etc., it does not have a certain fixed shape. For example, as shown in FIG. 4, there is a shape in which the movable range is wide near the oil suction portion 122, but the movable range is narrow near the oil outflow portion 112. Even in such a case, if the size of the magnet 140 is uniformly increased, the magnet 140 may not be able to enter a narrow portion of the movable range.

  Accordingly, the size of the magnet 140 is determined in consideration of the shape of the lower body 120, the amount of foreign matter to be removed from the filter 130, and the like. For example, the magnet 140 is formed such that the length connecting two arbitrary points on the outer periphery of the plane has a portion shorter than the minimum length when connecting two arbitrary points on the outer periphery of the bottom surface 121 of the lower body 120. May be. Alternatively, the magnet 140 may be formed so as to have a surface area capable of attracting these foreign matters based on the estimation result of the amount of iron-based foreign matters captured throughout the lifetime of the automobile. The estimated amount of foreign matter can be acquired based on past performance data, for example.

Further, as shown in FIG. 5, the magnet 140 has a thickness D larger than the distance d ₂ between the filter 130 and the rib 124 provided at the peripheral edge of the oil suction portion 122 so as not to come out of the oil suction portion 122. It is formed to be large. Thereby, the magnet 140 can be reliably located in the entrance side space _VL of the oil storage portion.

  The magnitude of the magnetic force of the magnet 140 can be appropriately determined according to the distance between the filter 130 and the magnet 140 and the foreign matter adsorption capability. For example, the magnitude of the magnetic force of the magnet 140 may be approximately the same as that of an oil pan magnet (both not shown) provided in the oil pan. The magnet 140 mainly functions as a member that removes foreign matter from the filter 130, but it is also possible to attract and capture foreign matter floating in the oil, such as an oil pan magnet.

  The configuration of the oil strainer 100 according to the present embodiment has been described above. As described above, the oil strainer 100 according to the present embodiment has a purification function of causing the iron-based foreign matter captured by the filter 130 to be attracted to the magnet 140 and removed from the filter 130. By providing such a magnet 140, foreign matter is captured by the filter 130, while foreign matter captured from the filter 130 is removed, so that the filtration area capable of capturing the foreign matter can be maintained without being rapidly reduced. Thus, the area of the filter 130 can be reduced. As a result, the oil strainer 100 can be reduced in size.

[2-2. Modification of magnet]
The magnet according to the present embodiment may have a shape other than the annular shape as shown in FIG. 2, for example, a shape as shown in FIGS. 6 to 8.

(Modification 1: Shape with flange)
The magnet 240 shown in FIG. 6 has a flange. The magnet 240 includes a base portion 241 and a flange portion 243. It arrange | positions in the entrance side space _VL of the oil strainer 100 so that the surface 242 of the flange part 243 may oppose the filter 130. FIG. The magnet 240 should just be that the flange part 243 is a magnet at least, and the material of the base part 241 is not specifically limited. The thickness D of the magnet 240 is formed to be larger than the distance d ₂ between the filter 130 and the rib 124. Thereby, the magnet 140 can be reliably located in the entrance side space _VL of the oil storage portion.

By providing the flange portion 240 like the magnet 240, the area facing the filter 130 can be increased, so that iron-based foreign matters can be efficiently adsorbed and removed from the filter 130. Further, the thickness _{D 1} of the base portion 241 larger than the height of the ribs 124, the thickness D of the entire magnet 240 to be smaller than the distance between the bottom surface 121 and the filter 130 of the lower body 120, a magnet 240 oil suction portion The flange portion 243 can pass between the rib 124 and the filter 130, while preventing it from coming out of the 122.

  Thereby, for example, when the base portion 241 contacts the rib 124, the flange portion 243 passes between the rib 124 and the filter 130 and is captured by the filter portion 138 at the position of the oil suction portion 122. It is possible to adsorb and remove iron-based foreign matter.

  The shapes of the base portion 241 and the flange portion 243 are not limited to the disk shape as shown in FIG. 6, but are determined in consideration of the shape of the lower body 120, the amount of foreign matter to be removed from the filter 130, and the like. . Further, the planar shapes of the base portion 241 and the flange portion 243 may be different shapes.

(Modification 2: Shape having a recess)
A magnet 340 shown in FIG. 7 is a disk-shaped magnet, and a concave portion 344 is formed on a surface (hereinafter referred to as “upper surface”) 342 on the side facing the filter 130. A plurality of hemispherical concave portions 344 are formed in the magnet 340 shown in FIG. 7, but the present invention is not limited to this example, and one or a plurality of concave portions may be formed, and the shape, depth, etc. Is not particularly limited.

  By forming the concave portion 344 on the upper surface 342 of the magnet 340, the surface area of the upper surface 342 can be increased, so that iron-based foreign matters can be efficiently adsorbed and removed from the filter 130. In addition, foreign substances removed from the filter 130 are accumulated in the recesses 344, so that even if the upper surface 342 of the magnet 340 comes into contact with the filter 130 and is rubbed, it is possible to keep the adsorbed foreign substances without dropping. The central through portion 146 of the annular magnet 140 shown in FIG. 2 also functions in the same manner as the concave portion 344.

  Although the surface area of the surface facing the filter 130 can be increased by adopting the shapes of the modified examples 1 and 2, in addition to these, for example, the surface facing the filter 130 of the magnet is made wavy or a convex portion is formed. By providing it, the surface area of the opposing surface can be increased.

(Modification 3: Configuration including a sound absorbing material)
A magnet 440 shown in FIG. 8 is configured by providing a sound absorbing material 443 on a lower surface (that is, a surface on the lower body 120 side) 444 of a main body portion 441 made of a magnet. The sound absorbing material 443 suppresses the generation of a contact sound with the lower body 120 when the magnet 440 idles in the entry side space V _L according to the behavior of the vehicle.

  The configurations of the magnets shown in FIGS. 2 and 6 to 8 can be combined as appropriate. For example, a sound-absorbing material may be provided on the lower surface 144 of the annular magnet 140 shown in FIG. 2, and a recess or the like may be formed on the surface of the flange portion 243 of the magnet 240 shown in FIG. In addition to the above, the magnet may be a plate-like member having an elliptical planar shape, a substantially spherical member, or the like.

<3. Summary>
The configuration of the oil strainer 100 according to the present embodiment has been described above. The oil strainer 100 captures foreign matter mixed in the oil sucked by the oil pump by the filter 130. In addition, a magnet 140 is provided in the entry side space of the oil strainer 100 according to the present embodiment, and when the vehicle accelerates or decelerates and turns left and right, the magnet 140 receives gravity generated by the behavior of the vehicle and receives the gravity in the entry side space. To play. At this time, the iron-based foreign matter captured by the filter 130 is attracted to the magnet 140 and removed from the filter 130. Thereby, the filter 130 can be purified.

  Usually, the portion of the filter 130 where the foreign matter is captured does not function as a filter medium. However, according to the oil strainer 100 according to the present embodiment, foreign matter captured from the filter 130 can be removed, and the oil strainer 100 can function as a filter medium again. Therefore, the filter 130 can be made smaller by the amount of the filtration area that can function as the filter medium again.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, in the above embodiment, the oil storage portion is formed by joining the upper body 110 and the lower body 120, but the present invention is not limited to such an example. For example, the oil storage portion may be integrally formed.

In the above embodiment, only one magnet 140 of the oil strainer 100 is provided, but the present invention is not limited to such an example. A plurality of magnets may be provided in the entry side space V _L of the oil strainer 100.

  Furthermore, although the configuration of the oil strainer 100 for transmission has been described in the above embodiment, the present invention is not limited to such an example. The configuration of the oil strainer 100 can be applied to all strainers used for portions that receive gravity in the front, rear, left, and right directions when the vehicle is operating, such as an engine oil strainer and a fuel filter.

DESCRIPTION OF SYMBOLS 100 Oil strainer 110 Upper body 112 Oil outflow part 120 Lower body 122 Oil suction part 124 Rib 130 Filter 132 Frame 134 Beam part 138 Filter part 140,240,340,440 Magnet 142 Upper surface 144 Lower surface 241 Base part 243 Flange part 344 Recessed part 443 Sound absorbing material

Claims (9)

An oil storage section comprising an oil suction section and an outflow section;
A filter medium that is provided so as to divide the space in the oil storage part into a suction part side and an outflow part side, and that filters oil passing through the oil storage part;
A magnet that is provided in the inlet space closer to the suction portion than the filter medium in the oil storage portion, and is movable in the inlet space;
An oil strainer. A rib projecting toward the filter medium side is provided on the peripheral portion of the suction portion of the oil storage portion,
The oil strainer according to claim 1, wherein a distance between the filter medium and the rib is smaller than a thickness of the magnet.   The oil strainer according to claim 1, wherein an outer shape of the magnet is formed in a rounded corner.   The oil strainer according to any one of claims 1 to 3, wherein the magnet has a recess formed on a surface facing the filter medium.   The oil strainer according to any one of claims 1 to 4, wherein the magnet has a flange formed on a surface facing the filter medium.   The oil strainer according to any one of claims 1 to 5, wherein the magnet includes a sound absorbing material on a surface opposite to a surface facing the filter medium.   The area of the surface of the magnet facing the filter medium is determined based on at least one of the shape of the oil container and the amount of foreign matter estimated based on the lifetime of the oil strainer. The oil strainer of any one of -6.   The oil strainer according to any one of claims 1 to 7, wherein at least an entry side space side where the magnet is arranged is formed of a material that the magnet does not attract. The oil strainer according to any one of claims 1 to 8, wherein a bottom surface in the oil storage portion is installed in the vehicle so as to be substantially parallel to the ground.

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