JP4597054B2 - filter - Google Patents

Description

  The present invention relates to a filter configured by providing a filter element in a casing in which an inflow hole and an outflow hole are formed.

  As shown in FIG. 5, the vehicle has an oil tank T that stores oil O for lubricating a sliding portion of the engine E, and an oil that supplies oil O stored in the oil tank T to the engine E. Lubrication composed of a pump P, a supply oil path L1 for interposing the oil pump P from the oil tank T to the engine E, and a return oil path L2 for guiding the oil O from the engine E to the oil tank T. A system LS is provided. The lubrication system LS is provided with oil filters FF and BF in order to remove impurities such as metal wear debris and carbon debris mixed in the oil O during the lubrication process of the engine E and operate the engine E stably. .

  The oil filter is configured by providing a filter element inside the casing in which the inflow hole and the outflow hole are formed, and the oil flowing into the casing from the inflow hole is filtered and purified in the process of passing through the filter element. And flows out from the outflow hole. As a filter element of an oil filter, a filter element is known that includes a filter medium that is formed in a cylindrical shape and has an internal space that penetrates vertically, and upper and lower end plates that are attached to the upper and lower ends of the filter medium.

  In addition, as a form of the oil filter, it is provided in the supply oil passage L1, the inflow hole is connected to the oil tank T through the oil pump P, the outflow hole is connected to the engine E, and relatively large metal wear debris or the like Provided in a full-flow type oil filter FF for capturing impurities and a branch oil passage L3 that branches from the supply oil passage L1 and returns to the oil tank T. Both the inflow hole and the outflow hole are connected to the oil tank T. A bypass flow type oil filter BF for capturing fine impurities such as carbon scrap is known (for example, see Patent Document 1). Further, there is known a dual flow type oil filter in which a full flow type oil filter and a bypass flow type oil filter are integrally assembled (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 9-192419 JP 2004-211671 A

  In the oil filter, when oil passes through the filter medium, pressure loss occurs, so that a differential pressure is generated between the space where the inflow hole communicates and the space where the outflow hole communicates inside the casing. In particular, in the bypass flow type oil filter, since the joint of the filter medium is set finely in order to capture fine impurities as compared with the full flow type oil filter, such a differential pressure is noticeable.

  For example, in an oil filter in which an inflow hole communicates with the external space of the filter medium and an outflow hole communicates with the internal space of the filter medium, when such a differential pressure occurs, the upper and lower end plates are directed upward and downward, respectively. Force. If the end plate is deformed under such a force, the filter medium may not be securely held, and the performance of removing impurities mixed in the oil may be reduced, which may make it difficult to operate the engine stably. was there.

  In view of such a problem, an object of the present invention is to provide a filter that can prevent deformation of an end plate even if a differential pressure is generated between a space where an inflow hole communicates and a space where an outflow hole communicates. And

  In order to achieve the above object, a filter according to the present invention includes a casing formed with an inflow hole and an outflow hole respectively connected to a storage member that stores fluid, and a fluid that is provided in an internal space of the casing and flows in from the inflow hole. Is a bypass flow type filter composed of a filter element that passes through and is filtered and flows out from the outflow hole, and the filter element is formed into a pleat-shaped tubular filter medium and provided inside the filter medium A cylindrical outer cylinder portion having a first communication hole formed on the outer peripheral side surface and a cylindrical inner cylinder portion having a second communication hole formed on the outer peripheral side surface, and the upper and lower portions between the outer cylinder portion and the inner cylinder portion. A first tube space penetrating through the inner tube portion, an inner tube in which a second tube space penetrating vertically is formed inside the inner cylinder portion, and at least one of the upper and lower ends of the filter medium. An upper and lower end plates each having an opening communicating with the second tube space are formed. An oil passage is formed through the opening of the end plate and penetrating therethrough. One end opening of the oil passage Comprises an oil passage forming member disposed in the second tube space, the inflow hole communicates with the outer space of the filter medium in the internal space of the casing, and the outflow hole communicates with the other end opening of the oil passage. Each of the end plates is supported by each of the upper end portion and the lower end portion of the outer cylinder portion and the inner cylinder portion.

  Moreover, it is preferable that an inner tube has at least 1 or more rib part which connects an outer cylinder part and an inner cylinder part. Further, the opening is formed in each of the upper and lower end plates, and the oil passage forming member is provided through the inside of the casing from the outside of the casing and through the opening of the upper and lower end plates. , A support portion that protrudes from the inner peripheral side surface of the inner cylinder portion to the second tube space to support the oil passage forming member, and the second tube space that is vertically partitioned by the support portion is connected to the support portion. It is preferable to form holes. At this time, it is preferable to provide the rib part and the support part at the same position in the vertical direction.

  In the filter according to the present invention configured as described above, the inflow hole communicates with the external space of the filter medium, the outflow hole communicates with the internal space of the filter medium, and the fluid that has flowed into the external space of the filter medium from the inflow hole passes through the filter medium. Passed and purified, led to the first tube space via the first communication hole, led to the second tube space via the second communication hole, and flows into the oil passage from one end opening and led to the outflow hole. It is a bypass flow type filter configured so that the inner tube has a double cylinder structure formed from the outer cylinder part and the inner cylinder part, and the upper and lower ends attached to the upper and lower ends of the filter medium The plate is configured to be supported by the outer cylinder part and the upper and lower ends of the inner cylinder part. Therefore, even if a force acts on the upper and lower end plates toward the second tube space due to the differential pressure generated inside and outside of the filter medium, the center portion of the end plate is supported by the inner cylinder portion, and thus resists deformation. be able to. By preventing the end plate from being deformed in this manner, for example, when it is provided in a vehicle lubrication system, stable operation of the engine is not hindered. Even if the inner tube has a double cylinder structure, the fluid that has passed through the filter medium is reliably guided to the outflow hole by the first and second communication holes and the oil passage formed by the oil passage forming member. The flow of fluid is also performed smoothly.

  In addition, by providing the rib part that connects the outer cylinder part and the inner cylinder part, the strength of the entire inner tube is ensured, and the support against the deformation of the end plate can be stably performed on the entire inner tube. .

  Further, the opening is formed in each of the upper and lower end plates, and the oil passage forming member is provided so as to penetrate the opening of the upper and lower end plates, and protrudes from the inner peripheral side surface of the inner cylinder portion to the second tube space. By forming the support portion that supports the oil passage forming member, the oil passage forming member is stably supported in a state where the filter is assembled. Further, when the oil passage forming member is supported by the support portion protruding into the second tube space, the second tube space is divided into two parts up and down by the support portion, but the second portion divided into two by the support portion. A communication hole for communicating the tube space is formed. Therefore, even if the second communication hole is opened in any of the two divided spaces, and the one end opening of the oil passage formed by the oil passage forming member is arranged in any of the two divided spaces, the inflow hole The flow of fluid from the outlet to the outlet is not hindered. Thus, stable support of the oil passage forming member and smooth flow of the fluid are compatible.

  Moreover, by providing the rib portion and the support portion at the same position in the vertical direction, the rib portion can support the oil passage forming member together with the support portion, and the support of the oil passage forming member can be further stabilized. Can be done.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The direction of the arrow U in FIG. 1 is upward, and the cylindrical or shaft-shaped members constituting the filter according to the present invention such as the lower case 4, the center bolt 5, the filter element 10, the filter paper portion 11, and the inner tube 20 are used. The shaft extends in the vertical direction in the following embodiment.

  As shown in FIG. 1, the oil filter 1 includes a casing 2 in which an inflow hole 2 a and an outflow hole 2 b are formed, and a filter element 10 provided inside the casing 2. The oil filter 1 is provided as a bypass flow type oil filter BF in the vehicle lubrication system LS shown in FIG. 5, and the inflow hole 2a is connected to the oil tank T via the branch oil path L3 and the supply oil path L1. The outflow hole 2b is connected to the oil tank T through the branch oil passage L3. Note that the oil O stored in the oil tank T contains impurities such as metal wear debris and carbon debris introduced during the lubrication process of the sliding portion of the engine E and guided through the reflux oil passage L2. Yes. The oil pump P for supplying the oil O stored in the oil tank T to the engine E operates using the engine E as a drive source.

  The casing 2 includes a filter head 3 formed in an engine case (not shown) or the like and having an open lower end surface 3a, and a bottomed cylindrical lower case 4 that is detachably attached to the filter head 3, and includes both members 3, 4 is combined to form a closed internal space 2C. The lower case 4 has a lower end surface 4a closed and an upper end surface 4b opened, and is fitted to the filter head 3 from below. A groove 4c is formed at the periphery of the upper end surface 4b of the lower case 4, and the fitting portion of the filter head 3 and the lower case 4 is sealed by an O-ring 31 provided inside the groove 4c.

  A central hole 4d is provided through the center of the lower end surface 4a of the lower case 4. A center bolt 5 is inserted through the lower case 4 through the center hole 4d. A recess 3b is formed at the center of the inner wall of the upper end of the filter head 3, and a bush 6 having an internal thread cut on the inner peripheral surface is provided in the recess 3b. A male screw 5 a is cut on the outer peripheral surface of the tip of the center bolt 5, and the center bolt 5 is screwed into a bush 6 provided on the filter head 3. Thereby, the filter head 3 and the lower case 4 are aligned and fixed.

  Further, a valve mounting plate 7 formed in a disc shape that matches the lower end surface 4 a of the lower case 4 is welded to the lower end surface 4 a of the lower case 4. The central portion of the valve mounting plate 7 is formed in a boss shape so as to be fitted into the central hole 4 d of the lower case 4. The lower case 4 and the valve mounting plate 7 are provided with through holes 4e and 7a, respectively, and the inside of the lower case 4 communicates with the outside. A relief valve 8 is attached by being fitted into a through hole 7 a of the valve mounting plate 7. The relief valve 8 is fixed to the valve mounting plate 7 by welding. The center bolt 5 is inserted into the lower case 4 via the valve mounting plate 7 and the washer 8 with respect to the lower case 4, and an O-ring 32 is interposed between the washer 8 and the valve mounting plate 7. Provided.

  The inflow hole 2 a is formed in the side wall of the filter head 3, and the outflow hole 2 b is formed in the upper end portion of the recess 3 b of the filter head 3. Further, the center bolt 5 is provided with a radial hole 5b extending in the radial direction from the outer surface toward the center, and the axial center extends axially inward from the distal end surface where the male screw portion 5a is formed, so that the radial hole 5b. Axial holes 5c communicated with each other are provided. A communication oil passage 5 </ b> A is formed inside the center bolt 5 by the radial hole 5 b and the axial hole 5 c. When the center bolt 5 is screwed into the bush 6, the opening 5C of the axial hole 5c opens into the recess 3b, and the communication oil passage 5A communicates with the outflow hole 2b through the recess 3b. The recess 3b becomes a closed space in which only the opening 5C of the axial hole 5c is opened when the center bolt 5 is screwed into the bush 6.

  The filter element 10 is formed in a pleated shape by folding a non-woven fabric or the like into a bellows shape and formed into a chrysanthemum-shaped filter paper portion 11 formed into a substantially cylindrical shape, and is formed of a resin material into the inner space of the filter paper portion 11. The inner tube 20 is provided, and the upper and lower end plates 12 and 13 are respectively formed in a substantially disk shape by injection molding of a resin material, and are respectively attached to the upper and lower end faces of the filter paper portion 11.

  The inner tube 20 includes a cylindrical outer cylinder portion 21 positioned on the outer side and a cylindrical pipe-shaped inner cylinder portion 26 positioned on the inner side. The inner tube 20 has a double cylindrical structure in which an outer cylindrical portion 21 and an inner cylindrical portion 26 are coaxially arranged. Both the cylindrical portions 21 and 26 are formed to have the same axial length, and the filter element 10 Is formed to be approximately equal to the axial length of Further, the inner tube 20 is formed with a first tube space 20 a penetrating up and down surrounded by the inner peripheral side surface of the outer cylindrical portion 21 and the outer peripheral side surface of the inner cylindrical portion 26, and the inner peripheral side surface of the inner cylindrical portion 26. A second tube space 20b is formed so as to be surrounded by and vertically penetrate.

  The outer cylinder portion 21 is formed in a ring shape having the same diameter and is vertically arranged so as to connect the plurality of ring portions 22, 22,... Coaxially arranged at equal intervals and the plurality of ring portions 22, 22,. It is formed from eight rib portions 23, 23,... That extend and are arranged at equal intervals in the circumferential direction of the ring portion 22. A large number of gaps 24, 24,... Partitioned by the ring portions 22, 22,.

  The inner cylinder portion 26 is formed in a cylindrical pipe shape having an outer diameter smaller than the inner diameter of the ring portion 22 and larger than the outer diameter of the center bolt 5. Four cutout portions 27a and 27b are formed on the upper end portion and the lower end portion of the inner cylinder portion 26 at equal intervals in the circumferential direction. In addition, a bolt support portion 29 that protrudes in a ring shape from the inner peripheral wall surface toward the second tube space 20b is formed at the upper and lower central portions of the inner cylinder portion 26. A support hole 28 having a diameter slightly larger than the outer diameter of the center bolt 5 is formed at the center of the bolt support portion 29. The bolt support 29 is formed with four notches 29a, 29a,... Extending from the periphery of the support hole 28 in the radial direction of the support hole 28. The four notches 29 a, 29 a,... Are provided at equal intervals in the circumferential direction of the support hole 28.

  Further, a bolt guide rib portion 25 is provided from the ring portion 22 of the outer cylinder portion 21 located in the same position as the bolt support portion 29 of the inner cylinder portion 26 in the axial direction toward the inner cylinder portion 26, and this bolt The outer cylinder part 21 and the inner cylinder part 26 are connected via the guide rib part 25. Eight bolt guide rib portions 25 are provided extending from between the rib portions 23, 23,... And are arranged at equal intervals in the circumferential direction of the ring portion 22. When viewed from the inner cylinder portion 26, the bolt guide rib portions 25 are provided extending radially in the radial direction.

  Moreover, the ring part 22 located in the upper end of the outer cylinder part 21 is formed with four locking parts 21a, 21a,... Protruding upward at equal intervals in the circumferential direction. The ring portion 22 located at the lower end of the outer cylinder portion 21 is similarly formed with four locking portions 21b protruding downward. Further, locking portions 26a and 26b projecting along the outer periphery are formed at the upper end portion and the lower end portion of the inner cylinder portion 26.

  Locking portions 12a and 13a are formed at the outer peripheral edge portions of the upper and lower end plates 12 and 13 by being bent at a right angle. The upper and lower end plates 12 and 13 are formed with grooves that can be engaged with the locking portions 21a, 21b, 26a, and 26b provided in the outer tube portion 21 and the inner tube portion 26 of the inner tube 20. . Further, through holes 12 b and 13 b that are larger than the diameter of the center bolt 5 and smaller than the inner diameter of the inner cylinder portion 26 are formed in the center portions of the upper and lower end plates 12 and 13. Rubber bushings 14 and 15 having an inner diameter substantially equal to the diameter of the center bolt 5 are inserted into the through holes 12b and 13b.

  When the inner tube 20 is provided in the internal space of the filter paper part 11, the inner peripheral surface of the filter paper part 11 is supported by the outer peripheral side surface of the outer cylinder part 21. Thus, the filter paper part 11 and the inner tube 20 are assembled, and the outer peripheral edge of the filter paper part 11 is engaged with the engaging parts 12a, 13a of the upper and lower end plates 12, 13, and each engaging part 21a is engaged with the groove. , 21b, 26a, 26b are engaged with each other to attach the upper and lower end plates 12, 13 to each other. Thereby, the upper and lower end surfaces of the filter paper part 11 are sandwiched between the upper and lower end plates 12 and 13 and are fixedly held in the axial direction and the radial direction. At the same time, the upper and lower end plates 12 and 13 are supported by the outer tube portion 21 and the inner tube portion 26 of the inner tube 20.

  A lower spring support member 33 is provided on the lower end surface 4 a of the lower case 4, and a spring 34 is attached to the lower spring support member 33. An upper spring support member 35 is provided at the upper end of the spring 34. The spring 34 is supported by upper and lower spring support members 33 and 35.

  In assembling the oil filter 1, first, the center bolt 5 is inserted into the lower case 4 via the washer 9. Next, the filter element 10 is attached to the inside of the lower case 4 by inserting the center bolt 5 into the rubber bushes 14 and 15 and the support holes 28 of the ring support portion 29. At this time, the rubber bush 15 attached to the lower end plate 13 is brought into contact with the upper spring support member 35. The lower case 4 with the center bolt 5 and the filter element 10 assembled in this way is fitted into the filter head 3, and the center bolt 5 is tightened and screwed into the bush 6. When the center bolt 5 is tightened upward, the rubber bush 14 attached to the upper end plate is brought into contact with the upper inner wall surface of the filter head 3 and the spring 34 is compressed. The spring 34 is compressed and exerts an upward biasing force, and the filter element 10 is held in a state where the rubber bush is in contact with the filter head 3. In this way, the filter element 10 is positioned and fixedly held in the internal space 2C of the casing 2, and the assembly of the oil filter 1 is completed.

  When the assembly of the oil filter 1 is completed, the diameter of the support hole 28 is substantially equal to the diameter of the center bolt 5, so that the second tube space 20 b is connected to the upper space 20 c and the lower space 20 d via the bolt support portion 29. Although divided in two, these upper and lower spaces 20c, 20d are communicated with each other through notches 29a, 29a,. Further, the opening 5B of the radial hole 5b that forms the communication oil passage 5A is located inside the upper space 20b and faces the notch 27a formed at the upper end of the inner cylinder part 26.

  In the internal space 2C of the casing 2, an inflow space 2A in which the inflow hole 2a communicates with the outside of the filter paper portion 11 and the upper and lower end plates 12, 13 is formed. An outflow space 2B in which the outflow hole 2b communicates with the inside (that is, the first tube space 20a, the second tube space 20b, the communication oil passage 5A, and the recess 3b) is formed.

  When the oil pump P is operated, the oil that has flowed from the oil tank T through the branch oil passage L3 and led to the oil filter 1 through the inflow hole 2a flows into the inflow space 2A and passes through the filter paper portion 11 from the outside to the inside. . The oil is cleaned by trapping impurities such as carbon debris in the filter paper part 11 in the process of passing through the filter paper part 11. The oil that has passed through the filter paper part 11 reaches the outer cylinder part 21 of the inner tube 20 and flows into the first tube space 20a through the gaps 24, 24,..., And is formed at the upper and lower ends of the inner cylinder part 26. It flows into the 2nd tube space 20b via the notch parts 27a and 27b. The oil that has flowed into the lower space 20d from the notch 27b at the lower end flows into the upper space 20c through the notches 29a, 29a,. The oil that has flowed into the upper space 20c is guided to the communication oil passage 5A, flows into the recess 3b, and flows out from the outflow hole 2b. The oil flowing out from the outflow hole 2b is returned to the oil tank T through the branch oil passage L3.

  Here, a differential pressure is generated between the oil before passing through the filter element 10 and the oil after passing through the filter element 10. In particular, the present embodiment is used as a bypass flow type oil filter BF for capturing fine impurities such as carbon dust, and since the joints of the filter paper portion 11 are fine, the occurrence of such differential pressure is remarkable. It can be seen. Further, in this embodiment, the oil flows from the outer side to the inner side of the filter paper portion 11, and according to the differential pressure, the upper and lower end plates 12, 13 from the outer side (inflow space 2A side). A force acts toward the inside (outflow space 2B side). In addition, the filter paper part 11 is supported from the inner side by the outer cylinder part 21 of the inner tube 20, and the deformation | transformation by such a differential pressure is prevented.

  The oil filter 1 of the present embodiment has a double cylindrical structure in which the inner tube 20 is composed of an outer tube portion 21 and an inner tube portion 26, and the upper and lower end plates 12 and 13 are inner tubes having such a structure. 20 is supported. Therefore, even if a differential pressure is generated on the inside and outside of the end plates 12 and 13 and a force is applied from the outside to the inside, the vicinity of the center of the end plates 12 and 13 remains at the center of the end plates 12 and 13. It is supported by the inner cylinder part 26 provided inside. As a result, the end plates 12 and 13 are prevented from being deformed, and stable oil circulation can be continuously performed even when used as a bypass flow type oil filter. In addition, since the deformation of the end plates 12 and 13 is effectively prevented in this way, the degree of freedom in selecting the material of the end plates 12 and 13 is improved. For example, a resin material is used as in this embodiment. Even if it is molded from a metal plate, it can be used.

  Moreover, the outer cylinder part 21 and the inner cylinder part 26 of a double cylindrical structure are connected by a plurality of bolt guide rib parts 25, 25,. Thereby, the intensity | strength of the inner tube 20 whole is ensured, and the end plates 12 and 13 resisting deformation can be supported stably. In addition, by providing in the same position as the bolt support part 29 of the inner cylinder part 26, the center bolt 5 can be supported integrally with the bolt support part 29 by the bolt guide rib part, and the center bolt 5 is supported. It can be performed stably.

  In this embodiment, the casing 2 is formed by fitting the filter head 3 and the lower case 4, the center bolt 5 penetrates the upper and lower end plates 12, 13, and the second tube space 20 b of the inner tube 20. It is provided by being inserted inside. A bolt support portion 29 having a support hole 28 having a diameter substantially equal to that of the center bolt 5 is formed in the inner cylindrical portion 26 that partitions the second tube space 20b of the inner tube 20 in the vertical center portion. Further, rubber bushes 14 and 15 having an inner diameter substantially equal to the center bolt 5 are attached to the centers of the upper and lower end plates 12 and 13. Thereby, the center bolt 5 is supported at three points with respect to the filter element 10, and the center bolt 5 is stably supported. Further, the filter element 10 can be easily assembled with the positional alignment with respect to the casing 2 and the center bolt 5 being ensured.

  At this time, the second tube space 20 b is divided into upper and lower spaces 20 c and 20 d via the bolt support portion 29, but the upper and lower spaces 20 c and 20 d are notched portions formed in the bolt support portion 29. 29a, 29a,... Therefore, regardless of whether the cutout portion communicating with the first tube space 20a is provided in either the upper space or the lower space 20c, 20d, the opening 5B of the radial hole 5b forming the communication oil passage 5A is formed in the upper and lower spaces. Regardless of whether it is located at 20c or 20d, the flow of oil from the first tube space 20a to the outflow hole 2b is not hindered. Further, in the present embodiment, the notch portion of the inner cylinder portion 26 is formed in both the upper end portion and the lower end portion, and the smooth flow of oil from the first tube space 20a to the second tube space 20b is facilitated. It is illustrated. Thus, in this embodiment, the stable support of the center bolt 5 and the smooth flow of the oil are compatible.

  So far, the embodiments of the filter according to the present invention have been described, but the configuration is not necessarily limited to the above embodiments. For example, the number of the rib portions 23, 23,... And the bolt guide rib portions 25, 25,. Further, the number of the cutout portions 27a, 27b, 29a formed in the upper end portion and the lower end portion of the inner cylinder portion 26 and the bolt support portion 29 is not limited to four, and the design can be changed as appropriate. Further, although the bypass flow type filter is used, the present invention can be similarly applied to a dual flow type filter configured by integrating a bypass flow type filter and a full flow type filter. Furthermore, although the filter according to the present invention is an oil filter provided in a vehicle lubrication system, it can also be applied as an oil filter used in other applications, and not only for oil filtration but also for filtering other fluids. It can be implemented in the same way even if it is used.

It is sectional drawing of the oil filter shown as an example of the filter which concerns on this invention. It is a sectional side view of the inner tube of the oil filter. FIG. 3 is a top view of the inner tube viewed in the direction of arrow III in FIG. 2. It is sectional drawing of the inner tube seen in the arrow IV-IV direction of FIG. It is a block diagram of the lubricating system of the vehicle provided with the filter which concerns on this invention.

Explanation of symbols

T Oil tank (storage member)
O Oil 1 Oil filter 2 Casing 5 Center bolt (oil passage forming member)
5A Communication oil passage (oil passage)
10 Filter element 11 Filter paper part (filter material)
12 Upper end plate 13 Lower end plate 20 Inner tube 21 Outer tube portion 24 Gap 25 Bolt guide rib portion (rib portion)
26 Inner cylinder part 27a, 27b Notch part (2nd communicating hole)
28 Support hole 29 Bolt support part (support part)
29a Notch (communication hole)

Claims (2)

A casing formed with an inflow hole and an outflow hole connected to a storage member for storing a fluid, respectively, and provided in an internal space of the casing, allowing the fluid flowing in from the inflow hole to pass through and filtered from the outflow hole A bypass flow type filter composed of a filter element to be discharged,
The filter element is formed in a pleat shape and has a cylindrical filter medium, a cylindrical outer cylinder portion provided with a first communication hole on the outer peripheral side surface, and a second communication hole on the outer peripheral side surface. A first tube space penetrating vertically between the outer tubular portion and the inner tubular portion, and a second penetrating vertically inside the inner tubular portion. It is composed of an inner tube in which a tube space is formed, and upper and lower end plates that are attached to the upper and lower ends of the filter medium, and at least one of which is formed with an opening communicating with the second tube space,
Provided with an oil passage forming member provided penetrating through the opening, forming an oil passage penetrating through the inside, and having one end opening of the oil passage disposed in the second tube space;
The inflow hole communicates with the outer space of the filter medium in the internal space of the casing, and the outflow hole communicates with the other end opening of the oil passage;
Each of the upper and lower end plates is supported by each of an upper end portion and a lower end portion of the outer tube portion and the inner tube portion ,
The inner tube has at least one or more rib portions that connect the outer tube portion and the inner tube portion ,
The opening is formed in each of the upper and lower end plates,
The oil passage forming member passes through the internal space of the casing from the outside of the casing, and is provided through the opening of the upper and lower end plates,
A support part is formed on the inner cylinder part so as to project from the inner peripheral side surface of the inner cylinder part into the second tube space and support the oil passage forming member. The support part is vertically moved by the support part. A filter having a communication hole communicating with the second tube space partitioned into two . The filter according to claim 1 , wherein the rib portion and the support portion are provided at the same position in the vertical direction.

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