JP2010149006A - Oil filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil filter capable of preventing oil from dripping in its vicinity upon replacing its filter element. <P>SOLUTION: The oil filter 1, constructed to allow the oil introduced from a return pipe 7 to pass through a filter element 2 and to flow out therefrom into an outlet pipe 8, includes a filter case 3 constituted of: a retainer 23 which is an oil separation member comprising an end-plate contact member 23c which is formed to have a shape approximately the same as that of a lower end plate 49 of the filter element 2 to follow the shape of the lower end plate 49, and is capable of tightly sticking thereto; and a retainer spring 22 with its one end supported by the retainer 23 and the other end supported by the lower end of the filter case 3, which energize the retainer 23 to tightly stick to the lower end plate 49 under a state wherein the filter element 2 is inserted into the filter case 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an oil filter for filtering oil, and more particularly to an oil filter provided with a detachable filter element.

  Since the lubricating oil used in various machines and the hydraulic oil in the hydraulic circuit of industrial hydraulic equipment are contaminated by use, it is necessary to appropriately filter. These oil filters used for filtration of hydraulic oil or the like are provided in the middle of the hydraulic circuit piping or connected to the end of the return side piping and installed in the oil tank. A filter element having a filter medium for filtering oil is disposed in the oil filter. However, since this filter element needs to be replaced every predetermined time, the filter element can be easily replaced. Various oil filters that can be used have been proposed.

For example, in Patent Document 1, a discharge hole is provided at the bottom of a detachable filter element. When the filter element is mounted in the filter case, an outlet pipe communicating with the oil tank is connected to the filter element from the discharge hole. The oil filtered through the filter medium in the filter element flows out from the outlet pipe into the oil tank, and when removed from the filter case, is discharged by the lid member provided in the filter element. An oil filter configured to prevent oil remaining in the filter element from leaking to the outside by closing the hole is disclosed.
JP-A-8-192004

  However, in such an oil filter, the used filter element discharged from the filter case for exchanging the filter element is in a state of being covered with oil with the oil attached to the entire surface by use. There are problems that the oil flows down from the surface of the filter element when it is carried around, drops and stains the surroundings, and soils the operator's clothes.

  In view of the problems as described above, an object of the present invention is to provide an oil filter that can prevent oil from dripping around when replacing a filter element.

  In order to solve the above-described problems, an oil filter according to the present invention has an element arrangement space inside, and an inflow hole (for example, the case inflow hole 20a in the embodiment) and an outflow hole communicating the element arrangement space with the outside. For example, the filter case in which the case outflow hole 21a in the embodiment is formed, the inflow space that communicates the element disposition space with the inflow hole, and the outflow space that communicates with the outflow hole (for example, the internal space S3 in the embodiment). The oil is introduced into the inflow space from the inflow hole through the filter element and flows out from the outflow space to the outflow hole. An oil filter that has a substantially identical shape so that the filter case follows the shape of the bottom of the filter element. An oil removing member (for example, the retainer 23 in the embodiment) having an abutting portion (for example, the end plate abutting portion 23c in the embodiment) that is formed and can be in close contact with the bottom portion, one end portion is supported by the oil removing member, and others An urging member that urges the oil removing member to be in close contact with the bottom of the filter element with the end portion supported by the lower end of the filter case and the filter element inserted into the filter case (for example, implementation And a retainer spring 22) in the form.

  In the oil filter configured as described above, an end plate (for example, the lower end plate 49 in the embodiment) provided so that the bottom of the filter element covers one end of the cylindrical filter medium in the cylindrical axial direction is provided. It is preferable to be provided.

  Further, the filter case includes an elastic member (for example, the wiper 17 in the embodiment) in an attachment / detachment opening (for example, the element insertion hole 12 in the embodiment) for inserting and removing the filter element into and from the element arrangement space, At the time of removal, it is preferable that the filter element is pulled out from the attachment / detachment opening of the filter case so that the outer peripheral surface of the filter element contacts the elastic member and the elastic member scrapes off the oil adhering to the outer peripheral surface.

  Further, the filter case includes a detachable cover member (for example, the flange cover 18 in the embodiment) that closes the attachment / detachment port, and the filter element is arranged in the state where the filter element is mounted in the filter case. It is preferable that the filter element is configured to be used as a set spring that biases the filter element toward the cover member so as to be fixedly held in the installation space.

  According to the oil filter of the present invention, in a state where the filter element is mounted in the filter case, the oil removing member is urged by the urging member so as to be in close contact with the bottom of the filter element, and the filter element bottom portion and the oil removing member are A very small amount of oil adheres only in the form of an oil film between them, and when the filter element is pulled out to discharge the filter element from the filter case, the oil film-like oil remaining between the bottom of the filter element and the oil removing member Since the bottom of the filter element leaves the contact (adhesion) with the oil film removing portion so as to peel off, almost no oil remains on the bottom of the filter element. Therefore, it is possible to prevent oil from dripping from the exhausted used filter element, and it is possible to prevent oil from dripping on the floor surface of a work place or the like and soiling the surroundings.

  In addition, if the elastic member is arranged at the filter element attachment / detachment opening of the filter case, the filter element is pulled upward when the filter element is replaced, so that the outer peripheral surface of the filter element comes into contact with the elastic member and Since the adhering oil is scraped off, it is possible to further prevent oil from dripping from the discharged filter element.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, referring to FIGS. 1 to 3, an oil filter (return filter) 1 connected to the end of the return side pipe 7 in the hydraulic circuit and mounted in the oil tank 6 to filter hydraulic oil (return oil). Will be described.

  As shown in FIG. 1, the oil filter 1 includes a filter element 2 and a filter case 3 having an element arrangement space S1 into which the filter element 2 can be detachably inserted.

  As shown in FIG. 1, the filter element 2 includes an element member 2a disposed in the filter case 3 and an element cover 2b detachably disposed on the upper portion of the element member 2a.

  As shown in FIG. 2, the element member 2 a includes a protector 30, an inner tube 41 disposed inside the protector 30, a filter medium 40 disposed on the outer periphery of the inner tube 41, and an upper portion of the protector 30. The upper end plate 45 is fixed to the end surface, the lower end plate 49 is fixed to the lower end surface of the protector 30, and the holder 55 is disposed inside the inner tube 41. The protector 30, the inner tube 41, the upper end plate 45, and the lower end plate 49 are formed so as to be incinerated with a combustible resin material such as plastic.

  The protector 30 is formed in a cylindrical shape with an outer diameter smaller than the inner diameter of the filter case 3 so that a predetermined inflow space (a space constituting a part of the element arrangement space S1) S2 is formed in the filter case 3. In the upper side of the side wall portion, a plurality of protector flow holes 31 punched and penetrated from the outside to the inside are formed as a pair of upper and lower sides at equal intervals in the circumferential direction.

  The filter medium 40 is formed in a cylindrical shape with an outer diameter smaller than the inner diameter of the protector 30 so as to be close to the inner peripheral surface of the protector 30, and the inner peripheral surface is in contact with and in contact with the outer peripheral surface of the inner tube 41. It is attached to. The filter medium 40 is formed by forming a plate-shaped filter paper into a pleated shape (chrysanthemum shape) with a predetermined width, or having a predetermined thickness using filter paper, glass fiber, nonwoven fabric, or the like.

  The inner tube 41 is formed in a cylindrical shape from a punching metal or the like along the inner peripheral surface of the filter medium 40, and has an internal space S3 in which a holder 55 can be disposed. Further, the inner tube 41 has a large number of tube circulation holes 42 on its side surface through which oil filtered by the filter medium 40 can be circulated to the internal space S3. The inner tube 41 and the filter medium 40 are sandwiched between upper and lower end plates 45 and 49 disposed at both ends of the protector 30 in the cylindrical axis direction.

  The upper end plate 45 is formed in a substantially hollow cylindrical shape, and a gasket 47 made of an elastic material such as rubber is disposed at the central inner diameter portion. At the center of the gasket 47, an element upper center hole 47a into which a lower outer portion of a valve holding portion 73 described later can be fitted is formed. Further, a hook engaging portion 46 is formed so as to protrude upward from the upper end portion of the upper end plate 45 and bend and extend in the circumferential direction.

  The lower end plate 49 has a substantially ring-shaped base end portion 49a in which a bent portion extending upward is formed on the outer peripheral side, and is bent inward after extending upward from the inner peripheral portion of the base end portion 49a. It has a pipe support portion 49b that extends and supports a gasket 50 formed of an elastic material such as rubber at its inner end. An element lower center hole 50a into which the outlet pipe 8 can be inserted and removed is formed in the inner peripheral portion of the gasket 50. When the outlet pipe 8 is inserted into the element lower center hole 50a, the elastic force of the gasket 50 causes The outlet pipe 8 is fitted and held so as to be slidable in the vertical direction with respect to the outlet pipe 8 and having a certain holding force. The gasket 50 can also be fitted with a cap portion 60a of the lower swing holder 60 described later.

  The holder 55 is disposed in the inner space S <b> 3 of the inner tube 41 and has an upper fixing holder 56, a holder spring 58, and a lower swing holder 60. The outer peripheral surface of the upper fixed holder 56 is joined to the inner peripheral surface of the inner tube 41 by welding or the like. In the center of the upper fixed holder 56, an upper holder oil passage hole 56a penetrating in the vertical direction is formed to allow oil to flow.

  The holder spring 58 is sandwiched between the upper fixed holder 56 and the lower swing holder 60 so that one end is supported by the lower swing holder 60 and the other end is supported by the upper fixed holder 56. .

  As shown by the chain line in FIG. 2, the lower swing holder 60 is swingable up and down within the inner space S3 of the inner tube 41 by the biasing force of the holder cylinder 58, and is a cap portion formed in a cylindrical saucer shape. When the element 60a is fitted to the gasket 50, it is detachable from the element lower center hole 50a, and a plurality of fins 60b are formed so as to protrude downward from the bottom surface of the cap part 60a. It is configured to be detachable. Since the plurality of fins 60b are provided on the bottom surface of the cap portion 60a at predetermined intervals in the circumferential direction, fin oil holes 60c through which oil can flow are formed between the fins 60b. Even if each fin 60b is fitted to the outlet pipe 8, the oil in the internal space S3 can pass through the fin oil passage hole 60c and flow into the outlet pipe 8. Yes.

  The element cover 2b is detachably attached to the upper end plate 45 of the element member 2a. As shown in FIG. 3, the element cover 2 b includes a handle flange 70 formed in a substantially disc shape, a handle 77 screwed to the center upper end of the handle flange 70 by a bolt 77 a, and a lower portion of the handle flange 70. And a relief valve 80.

  In the handle flange 70, a relief oil passage 70a for allowing relief oil to flow by being connected to the valve holding portion 73 is formed from the inflow space S2 toward the internal space S3. The outer portion of the handle flange 70 has a first outer portion 71 and a second outer portion 72. The first outer portion 71 is formed as a plurality of substantially fan-shaped protrusions at equal intervals in the circumferential direction in plan view. The second outer portion 72 has an outer diameter slightly smaller than an inner diameter portion 13b of the ring member 13 described later, and an O-ring groove 71a is formed in the second outer portion 72. By mounting the O-ring 79 in the O-ring groove 72a, the oil in the inflow space S2 does not flow out from the fitting portion between the outer portion of the handle flange 70 and the inner peripheral portion of the tank flange 10. .

  The valve holding portion 73 has a fixing screw portion 78 formed with a male screw in the center, and is attached to the lower portion of the handle flange 70 by screwing the fixing screw portion 78 into the screw hole portion 70b of the handle flange 70. It is done. The valve holding portion 73 is formed with a pair of left and right hooks 76 that extend outward from the upper outer portion and then bend about 90 ° and extend upward. The element cover 2b and the element member 2a can be connected by engaging the hook 76 with the hook engaging portion 46 of the upper end plate 45.

  The relief valve 80 includes a disk-shaped valve 80a, a support bolt 80b inserted downward from the upper center of the handle flange 70, a valve spring 80c having a predetermined urging force that pushes the valve 80a upward, A spring receiver 80d attached to receive the lower end of the valve spring 80c, and a receiving nut 80e that can be screwed with the support bolt 80d. The valve 80a is always in contact with the lower end surface of the valve holding portion 73 by the urging force of the valve spring 80c, and is closed so that the relief oil passage 70a and the internal space S3 do not communicate with each other. When the valve 80a is opened against the urging force of the valve spring 80c (pressed downward), the relief oil passage 70a and the internal space S3 communicate with each other.

  Next, the filter case 3 in which the filter element 2 is detachably disposed for filtering the return oil will be described. As shown in FIG. 1, the filter case 3 includes a tank flange 10 fixed to the inner periphery of a circular tank opening formed on the upper surface portion 6 a of the oil tank 6, and an upper surface side of the tank flange 10. A disc-shaped flange cover 18 that is detachably attached by a plurality of bolts 11 with the same center axis in the vertical direction, and the center axis of the above-mentioned center axis are fixed on the lower surface side of the tank flange 10. A hollow cylindrical case body 20, a bottom plate 21 fixed to cover the opened bottom surface of the case body 20, and a retainer spring 22 provided on the bottom plate 21 can swing up and down. And a retainer 23 disposed on the surface. The tank flange 10, the flange cover 18, the case body 20, the bottom plate 21, and the retainer 23 are made of a non-ferrous metal such as an aluminum alloy or a metal material such as iron.

  Further, the filter case 3 has an element disposition space S1 in which the filter element 2 can be disposed, and a hollow pipe-like return side pipe 7 is communicated from the case inflow hole 20a on the side wall of the case body 20. As a result, the return oil passing through the return side pipe 7 can flow into the element arrangement space S1. A case outflow hole 21a is formed at the center of the bottom plate 21, and a hollow pipe-shaped outlet pipe 8 is fitted and joined from the case outflow hole 21a so as to extend upward (in the element arrangement space S1). .

  The tank flange 10 is formed in a hollow cylindrical shape, and an element insertion hole 12 through which the filter element 2 can be inserted vertically is formed at the center. The inner peripheral portion of the tank flange 10 forming the element insertion hole 12 is formed in a stepped shape having a small diameter portion 12a, a medium diameter portion 12b, and a large diameter portion 12c. A ring member 13, a plate member 15, and a wiper 17 are attached by bolts 16 on the end surface portion connecting the medium diameter portion 12 b and the large diameter portion 12 c. Further, an O-ring 14 is disposed on the inner side of the large diameter portion 12c.

  As shown in FIG. 4, the ring member 13 includes an outer diameter portion 13 a having substantially the same diameter as the medium diameter portion 12 b of the tank flange 10 and an inner diameter portion 13 b having substantially the same diameter as the small diameter portion 12 a of the tank flange 10. In the inner diameter portion 13b, substantially fan-shaped first engagement grooves 13c are formed at equal intervals in the circumferential direction in a plan view recessed from the upper end surface. The first engaging groove 13c is formed to have a size that allows the first outer portion 71 of the handle flange 70 to be inserted in the vertical direction.

  As shown in FIG. 5, the plate member 15 includes an outer diameter portion 15 a having substantially the same diameter as the medium diameter portion 12 b of the tank flange 10 and an inner diameter portion 15 b having substantially the same diameter as the small diameter portion 12 a of the tank flange 10. In the inner diameter portion 15b, second engagement grooves 15c are formed at equal intervals in the circumferential direction so as to correspond to the first engagement grooves 13c of the ring member 13. The second engagement groove 15c is formed to have a size that allows the first outer portion 71 of the handle flange 70 to be loosely inserted.

  The ring member 13 and the plate member 15 are positioned so that the first engagement groove 13c and the second engagement groove 15c overlap (the center lines X1 and X2 of the engagement grooves 13c and 15c coincide with each other). And are attached to the tank flange 10. The first outer portion 71 of the handle flange 70 is inserted through the second engagement groove 15c of the plate member 15 and further reaches the first engagement groove 13c of the ring member 13, and then viewed in plan view. It can be engaged by rotating around. At this time, the width W2 in the circumferential direction of the second engagement groove 15c is set smaller than the width W1 in the circumferential direction of the first engagement groove 13c. Then, even if the handle flange 70 is lifted upward, the first outer portion 71 contacts the lower end surface of the plate member 15 and does not come out of the second engagement groove 15c.

  The wiper 17 is provided such that the inner side portion protrudes inward from the inner diameter portion 13 b of the ring member 13 and the small diameter portion 12 a of the tank flange 10. As shown in FIG. 6, the wiper 17 has an inner diameter portion 17a that is smaller than the outer diameter of the protector 30, and cutout portions 17b extending from the inner diameter portion 17a to substantially the center in the radial direction are equally spaced in the circumferential direction. Is formed. For this reason, since the inner diameter portion 17a can be greatly expanded so that the inner diameter portion 17a is pushed and expanded by the notch portion 17b, the protector 30 can be inserted while being in contact with the inner diameter portion 17a.

  The flange cover 18 has a circular groove that accommodates the upper end of the filter element 3 on the bottom surface and is formed in a disk shape. The flange cover 18 can be attached and detached so that the element insertion hole 12 of the tank flange 10 is closed by the bolt 11. Attached to. Further, since the flange cover 18 is pressed and sealed so as to crush the O-ring 14 disposed on the large-diameter portion 12 c of the tank flange 10, it is possible to prevent dust and dirt from entering the filter case 2. It is preventing.

  The retainer spring 22 is inserted into the outlet pipe 8 and has a small inner diameter so that the upper and lower ends are narrowed inwardly, so that the lower end is the outer periphery of the outlet pipe 8 on the bottom plate 21. The upper end portion is supported by the lower outer peripheral portion of the retainer 23.

  The retainer 23 is swingable up and down by the urging force of the retainer spring 22 in a state where the outlet pipe 8 is inserted in the element disposition space S3. The retainer 23 includes a sleeve-like spring support portion 22a that supports an upper end portion of the retainer spring 22, an intermediate portion 22b that extends upward from the spring support portion 22a, and a bent portion that extends substantially downward from the intermediate portion 22b. Further, a substantially disc-shaped end plate abutting portion 22c extending to the position where the outer end portion of the lower end plate 49 has substantially the same diameter toward the outer side, and a bent portion bent downward from the end plate abutting portion 22c 22d and these are integrally formed. The end plate abutting portion 22c is formed so that the shape of the upper surface substantially conforms to the shape of the bottom surface of the lower end plate 49, and when the filter element 2 is mounted in the filter case 3, the retainer By being biased upward by the spring 22, the upper surface of the end plate abutting portion 22 c comes into contact with the bottom surface of the lower end plate 49 and is held in close contact.

  A case where return oil is filtered by the oil filter 1 configured as described above will be described. First, a procedure for attaching the filter element 2 to the filter case 3 will be described. The filter element 2 before being attached to the filter case 3 (unused state) is in a state where the element cover 2b is connected to the element member 2a by engaging the hook 76 and the hook locking portion 46, and the handle 77 is The filter element 2 can be brought up to the filter case 3 by grasping with a palm.

  Since the filter element 2 is attached to the filter case 3 from the element insertion hole 12 of the tank flange 10, the bolt 11 is removed and the flange cover 18 is removed from the tank flange 10. When the flange cover 18 is removed, the opening of the element insertion hole 12 of the tank flange 10 is opened. The operator grasps the handle 77 and inserts the filter element 2 straight from the element insertion hole 12 into the element arrangement space S <b> 1 of the case body 20. The filter element 2 is inserted downward. As shown in FIG. 7, the bottom surface of the lower end plate 49 is brought into close contact with the end plate contact portion 22c of the retainer 23, and at the same time, the urging force of the retainer spring 22 is increased. Start to work. When the filter element 2 is further inserted downward against the urging force of the retainer spring 22 and the fin 60b of the filter element 2 is fitted into the outlet pipe 8, the gasket 50 is removed from the cap portion 60a. It swings downward so that it comes off and slides on the outer periphery of the outlet pipe 8.

  Further, when the urging force of the retainer spring 22 becomes larger than the weight of the filter element 2, the operator inserts the filter element 2 so as to push it downward against the inferior force. Then, the valve holding portion 73 is pushed down and fitted so as to be inserted into the element upper center hole 47 a of the gasket 47.

  When the handle flange 70 of the element cover 2b reaches a position where it reaches the element insertion hole 12 of the tank flange 10, the first outer portion 71 of the handle flange 70 is inserted through the second engagement groove 92b of the plate member 92, and After reaching the inside of the first engaging groove 91b of the ring member 91, the filter element 2 is rotated clockwise in a plan view so that the handle flange 70 is engaged with the ring member 91 and the plate member 92. Temporarily fix in 3.

  Then, by reattaching the flange cover 18 to the tank flange 10 with the bolt 11, the filter element 2 urged upward by the urging force of the retainer spring 22 is fixedly held while the flange cover 18 is pushed downward. In this way, the retainer spring 22 always urges the filter element 2 upward, and the urging force is received by the flange cover 18, so that the filter element 2 can be firmly held in the filter case 3, and the retainer spring 22 can also serve as a set spring that suppresses the behavior of the filter element 2.

  Next, the flow of return oil filtered by the oil filter 1 to which the filter element 2 is mounted as described above will be described with reference to FIG. In FIG. 1, the oil flow is indicated by an arrow F. The return oil flows from the outside of the oil tank 6 through the return side pipe 7 into the inflow space S2 in the filter case 3. At this time, the inside of the oil tank 6 is pressurized and adjusted to a pressure higher than the atmospheric pressure by an air breather (not shown) provided in the oil tank 6, and the oil level in the filter case 3 is increased from L0 to L1. . The return oil that has flowed into the inflow space S2 changes its flow direction by hitting the outer wall of the protector 30, flows upward, and flows from the protector circulation hole 31 toward the inside of the filter medium 40. At this time, impurities such as dust mixed in the oil are filtered by the filter medium 40. The filtered oil flows into the internal space S3 through the tube flow hole 42 of the inner tube 41. In addition, since the filter medium 40 is in contact with the outer periphery of the inner tube 41, even if oil flows in from the outer peripheral side, the filter medium 40 is not pushed and deformed. The oil that has flowed into the upper portion of the internal space S3 flows into the lower portion of the internal space S3 from the upper holder oil passage hole 56a of the upper fixed holder 56, and then flows into the outlet pipe 8 through the fin oil passage port 60c. This causes the oil tank 6 to flow out.

  When the filter medium 40 is clogged, the pressure of the oil in the inflow space S2 becomes high, and the pressure difference between the circulation space S2 and the internal space S3 becomes a predetermined pressure or more. Thereby, the oil flowing into the relief oil passage 70a pushes the valve 80a downward by a force equal to or greater than the urging force of the valve spring 80c to open the valve. For this reason, the relief oil passage 70a and the internal space S3 are communicated with each other, and the oil flows into the internal space S3 from the valve opening portion of the valve 80a without passing through the filter medium 40, thereby preventing the oil filter 1 from being damaged. I am doing so.

  In the oil filter 1 configured as described above, the filter medium 40 is clogged when used for a long time. Therefore, it is necessary to replace the filter element 2 periodically (every predetermined time). Is performed in the reverse order of installation. At this time, since the inside of the case body 20 is hermetically sealed, the handle 77 is not in contact with the oil in the case body 20, and an operator's hand passes through the handle 77 when removing the filter element 3. It prevents the hands and clothes from getting dirty by touching the oil and the surroundings from getting dirty.

  First, after removing the flange cover 18 from the tank flange 10, the operator holds the handle 77 attached to the filter element 2 with his / her palm and lifts the filter element 2 upward. When the filter element 2 is pulled upward, the gasket 50 slides upward with respect to the outlet pipe 8 with a constant fitting force due to the elastic force of the gasket 50. Here, the fitting force of the fin 60b with respect to the outlet pipe 8 is configured to be stronger than the fitting force of the gasket 50 with respect to the outlet pipe 8, and the holder spring 58 presses the fin 62 against the outlet pipe 8 from above. Therefore, even if the filter element 2 is pulled upward, the fins 62 are not detached from the outlet pipe 8. Further, after the gasket 50 is slid upward and comes out of the outlet pipe 8, the gasket 50 is fitted into the cap portion 60a of the lower swing holder 60, so that the element lower center hole 50a of the gasket 50 has the cap portion 60a. It will be blocked by. When the filter element 2 is lifted upward from this state, the upper surface portion of the gasket 50 is brought into contact with the outer lower surface portion of the cap portion 60a, and the force for the operator to lift the filter element 2 upward is from the outlet pipe 8. In addition to acting to pull out the fin 60b, the gasket 50 is securely fitted to the cap portion 60a by receiving this force. For this reason, the oil remaining in the filter element 2 does not leak from the element lower center hole 50a.

  In addition, when the filter element 2 is pulled up, as shown in FIG. 8, the outer peripheral portion of the filter element 2 (protector 30) passes through while contacting the inner diameter portion 17a of the wiper 17 so as to expand upward. The wiper 17 can scrape off the oil adhering to the outer peripheral portion of the filter element 2. Thus, when the filter element 2 is discharged, the oil attached to the outer peripheral portion of the filter element 2 is scraped off by the wiper 17 so that the oil can be prevented from dripping from the filter element 2 and contaminating the surroundings. And the retainer 23 is provided in order to reduce the oil which adheres to the bottom part (lower end plate 49) of the filter element 2, and to reduce oil dripping more.

  By pulling the filter element 2 upward, the retainer 23 is moved so that the end plate abutting portion 22 c of the retainer 23 abuts on the base end portion 49 a of the lower end plate 49 by the retainer spring 22 as shown in FIG. 8. The filter element 2 is urged and brought into a close contact state, and the filter element 2 is pulled upward and swings upward while being in close contact with the lower end plate 49 by the urging force of the retainer spring 22. When the bottom of the filter element 2 comes out of the oil level in the case body 20 and reaches the position where the retainer spring 22 is extended until the urging force of the retainer spring 22 does not act on the retainer 23, the lower end plate 49 is reached. The base end portion 49a of the retainer 22 moves away from the contact with the end plate contact portion 22c. At this time, because the retainer 23 is in close contact with the bottom surface of the lower end plate 49, a very small amount of oil adheres only between the lower end plate 49 and the retainer 23 in the form of an oil film. By separating the lower end plate 49, the oil film-like oil adhering between the retainer 23 and the lower end plate 49 is separated so as to be peeled off. In addition, only a thin oil film remains and does not drop due to its own weight. Therefore, the filter element 2 is pulled out from the filter case 3 with little oil adhering to the surface (outer peripheral surface and bottom surface).

  The filter element 2 can be easily discharged from the filter case 3 by grasping the handle 77 and lifting the filter element 2 upward. Here, the filter element 2 discharged from the filter case 3 remains in the filter element 2 because the element lower center hole 50a opening the center of the lower end plate 49 is firmly closed by the cap portion 60a. Oil does not leak from the element lower center hole 50a. And since the retainer 23 and the wiper 17 adhere to the surface (outer peripheral surface and bottom surface) of the filter element 2 to the minimum, the oil can be prevented from flowing down or dripping along the surface. Therefore, when the discharged filter element 2 is carried, the surroundings are not contaminated by oil dripping on the floor surface of a work place or the like.

  In the filter case 3 from which the filter element 2 has been discharged, unfiltered oil remains, but the tip of the outlet pipe 8 is configured to be above the oil oil level. Therefore, there is no possibility that the oil before filtration flows into the outlet pipe 8 and flows out into the oil tank 6.

  According to the oil filter 1 configured as described above, since the filter element 2 is replaced after a long period of use, even if the filter element 2 is discharged from the filter case 3, oil leaks from the surface of the filter element 2. It is possible to prevent the surroundings from being soiled.

It is side surface sectional drawing which shows the oil filter which concerns on embodiment of this invention. It is side surface sectional drawing which shows the element member of the filter element which comprises a part of said oil filter. It is side surface sectional drawing which shows the element cover of a filter element. The ring member with which the filter case which comprises a part of said oil filter is equipped is shown, (A) is a top view which shows a ring member, (B) is side sectional drawing of a ring member. It is a top view which shows the plate member with which a filter case is equipped. It is a top view which shows the wiper with which a filter case is equipped. It is side surface sectional drawing which shows the state in the middle of a filter element being mounted in a filter case. It is principal part sectional drawing which shows the state in the middle of the filter element being discharged | emitted from the inside of a filter case.

Explanation of symbols

1 Oil Filter 2 Filter Element 2a Element Member 2b Element Cover 3 Filter Case 12 Element Insertion Hole (Removal Port)
17 Wiper (elastic member)
18 Flange cover (cover member)
20a Case inflow hole (inflow hole)
21a Case outflow hole (outflow hole)
22 Retainer spring (biasing member)
23 Retainer (oil removal member)
23c End plate contact part (contact part)
49 Lower end plate S1 Element arrangement space S2 Inflow space S3 Internal space (outflow space)

Claims (4)

A filter case having an element arrangement space inside, and having an inflow hole and an outflow hole communicating the element arrangement space with the outside;
The element arrangement space is divided into an inflow space that communicates with the inflow hole and an outflow space that communicates with the outflow hole, and includes a filter element that is detachably attached to the element arrangement space.
An oil filter configured to allow oil introduced from the inflow hole to the inflow space to flow through the filter element and outflow from the outflow space to the outflow hole,
The filter case is
An oil removing member that has a contact portion that is formed in substantially the same shape so as to follow the shape of the bottom portion of the filter element and can be in close contact with the bottom portion;
One end portion is supported by the oil removing member, the other end portion is supported by a lower end portion in the filter case, and the oil removing member is inserted into the filter case. An oil filter comprising: an urging member that urges the bottom part of the oil pipe so as to be in close contact therewith.   2. The oil filter according to claim 1, wherein the bottom portion of the filter element includes an end plate provided to cover one end of the filter medium formed in a cylindrical shape in the cylindrical axis direction. The filter case includes an elastic member at an attachment / detachment opening for inserting / removing the filter element into / from the element disposition space,
When removing the filter element, by pulling out the filter element from the attachment / detachment port of the filter case, the outer peripheral surface of the filter element comes into contact with the elastic member, and the elastic member scrapes oil adhering to the outer peripheral surface. The oil filter according to claim 1 or 2, wherein the oil filter is dropped. The filter case includes a detachable cover member that closes the detachable opening,
The biasing member biases the filter element toward the cover member so that the filter element is fixedly held in the element installation space in a state where the filter element is mounted in the filter case. The oil filter according to claim 1, wherein the oil filter is configured to be used as a set spring.

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