JP4887317B2 - Oil filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil filter capable of preventing oil from leaking out to the outside at the time of replacement of a filter element and contaminatong the circumference. <P>SOLUTION: The oil filter is equipped with: a lower shaking holder 60, which is constituted so as to form a fin oil passing port 62b allowing an internal space S4 to communicate with outlet piping 8 to the filter element 3, composed of the fin 62 freely detachable with respect to the leading end port of the outlet piping 8 and a cap part 60b freely detachable with respect to an element lower part center hole 50a and provided so as to be freely shaken up and down in the internal space S4 of the filter element 3, and the coil spring 58 arranged above the lower shaking holder 60 in the internal space S4 to energize the lower shaking holder 60 downward. <P>COPYRIGHT: (C)2009,JPO&amp;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, an element part discharge hole through which an outlet pipe (hollow pipe) can be inserted is formed at the bottom of a detachable filter element, and an outlet pipe having a flow hole on a side surface is provided as the element part discharge hole. The filter element can be disposed in the filter case so as to extend upward from the outlet, and the filtered oil flows out from the outlet pipe into the oil tank through the circulation hole, and the element portion discharge hole and An oil filter is disclosed that has a lid member that can be attached to and detached from the distal end of the outlet pipe so that when the filter element is discharged, the lid member closes the element portion discharge hole. As a result, when the filter element is discharged, the filter element can be easily replaced without oil remaining in the filter element spilling out and contaminating the surroundings.
JP-A-8-192004

  However, in such an oil filter, a flow hole for allowing the oil to flow into the oil tank is formed on the side surface of the outlet pipe. Therefore, when the filter element is mounted, the filtered oil is passed through the flow hole so as to pass through the oil tank. However, when the filter element is discharged, the oil before filtration remaining in the filter case passes through this flow hole and flows into the oil tank, and impurities are mixed into the oil tank. There was a problem that the deterioration of the oil of the oil progressed. In addition, since the lid member is provided in a free state inside the filter element, the lid member may not be securely fitted into the element portion discharge hole when the filter element is attached or detached, and residual oil in the filter element may leak out. It was.

  In view of the above problems, the present invention prevents oil remaining in the filter case from flowing out into the oil tank even when the filter element is pulled out, and prevents deterioration of the oil in the oil tank, It is an object of the present invention to provide an oil filter that can prevent oil remaining in the filter element from leaking to the outside when the filter element is replaced, and contaminating the surroundings.

  In order to solve the above problems, an oil filter according to the present invention is fixed in an oil tank for storing oil, has an element disposition space inside, and has an inflow hole (for example, a case inflow hole in the embodiment). 20a) and a filter case having an outflow hole (for example, case outflow hole 20b in the embodiment) formed in the bottom portion, and inserted from the outside of the oil tank into the inflow hole to communicate the outside with the element disposition space. A return side pipe, an outlet pipe that is inserted into the outflow hole from the oil tank and extends upward in the element arrangement space, and communicates the oil tank and the element arrangement space. It has an element discharge hole (for example, the element lower center hole 50a in the embodiment) formed so that the outlet pipe can be inserted, and the element A filter element that is installed in the element installation space by dividing the installation space into an inflow space that communicates with the return side piping and an outflow space that communicates with the outlet piping, and that projects the exit piping from the element discharge hole into the outflow space; An oil filter comprising: an oil passage opening (for example, the fin oil passage opening 62b in the embodiment) that communicates the outflow space with the inside of the outlet pipe in the filter element. The first connecting portion (for example, the fin 62 in the embodiment) detachable with respect to the element and the second connecting portion (for example, the cap portion 60b in the embodiment) that is detachable with respect to the element discharge hole. An oscillating lid member (for example, the lower oscillating holder 60 in the embodiment) provided so as to oscillate up and down in the space, and the outflow space A biasing member for biasing the upper disposed swinging lid member of the swinging lid member downward (e.g., a coil spring 58 in the embodiment) in which a. In a state where the filter element is mounted in the filter case, the first connecting portion of the swing lid member is mounted at the distal end of the outlet pipe so that the urging member does not remove the swing lid member from the outlet pipe. After energizing, the fluid introduced from the outside through the return side pipe into the inflow space is filtered through the filter element, and then from the outflow space through the oil passage port of the first connecting portion, from the outlet pipe When the filter element is drained into the oil tank and the filter element is removed from the filter case, the swing lid member is removed from the outlet pipe, and the second connecting part is attached to the element discharge hole, thereby closing the filter element bottom. In addition, the biasing member is configured to bias the swing lid member so as not to be removed from the element discharge hole.

  In the oil filter, the first connecting portion includes a plurality of fitting protrusions (for example, the fins 62 in the embodiment) that are formed in the lower portion of the swing lid member and can be fitted to the tip end of the outlet pipe. In a state where the plurality of fitting protrusions are fitted to the outlet pipe, the gap formed between the plurality of fitting protrusions is configured to be an oil passage opening (for example, the fin oil passage opening 62b in the embodiment). It is preferable.

  Moreover, it is preferable that the fitting protrusion of the first connecting portion is formed in a blade shape (for example, the fin 162 in the embodiment).

  Further, the element discharge hole is composed of an inner diameter portion of a ring-shaped elastic member (for example, the gasket 50 in the embodiment) disposed at the bottom of the filter element, and when removing the filter element, the filter element is pulled out upward to remove the outlet. The element discharge hole also moves upward along the outer periphery of the pipe, and after the second connecting part of the swinging lid member is mounted on the element discharge hole, the first connecting part of the swinging cover member comes off from the front end of the outlet pipe. It is preferable that it is comprised.

  Furthermore, it is preferable that the swing lid member has a hollow cylindrical outer cylinder portion (for example, the holder outer cylinder portion 60a in the embodiment) having an outer diameter slightly smaller than the inner peripheral surface of the filter element.

  According to the oil filter relating to the present invention, in the state where the filter element is removed from the filter case, the oil remaining in the filter case does not flow out from the outlet pipe to the oil tank. Can be prevented. In addition, even in the removed filter element, the biasing member biases the swing biasing member so that the swing biasing member is securely fitted to the element discharge hole, so that the bottom of the filter element is closed by the swing lid member. Oil remaining in the element, impurities trapped by the filter medium do not leak to the outside, and there is no risk of contaminating the surroundings. Further, in a state where the filter element is mounted on the filter case, even if the swing lid member is attached to the tip end of the outlet pipe, the oil filtered by the filter element passes through the oil passage port of the swing lid member. Since it can distribute | circulate to an exit piping, the distribution | circulation to this oil tank of this filtered oil is not prevented.

  Moreover, if the fitting protrusion of the first connecting portion is formed in a blade shape, the oil flow filtered in the filter element can be vortexed and guided to the outlet pipe, so that the oil pressure loss can be reduced. it can.

  Furthermore, if an elastic member is provided at the bottom of the filter element to form the element discharge hole, the swinging lid member can be smoothly attached to the element discharge hole when the filter element is removed. Be improved.

  In addition, if the swinging lid member is provided with a hollow cylindrical outer cylinder part having an outer diameter slightly smaller than the inner peripheral surface of the filter element, the swinging cover member rotates up and down in the filter element when the filter element is mounted. It can be swung straight without being done.

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

  As shown in FIG. 1, the oil filter 1 includes a filter case 2 having an element arrangement space S1 therein, a filter element 3 removably attached in the element arrangement space S1, and an upper end portion of the filter element 3. The element cover 4 is detachably attached so as to cover the opening of the element arrangement space S1.

  The filter case 2 has a tank flange 10 fixed to the inner peripheral portion of the tank opening formed on the upper surface portion 6 a of the oil tank 6, and the center axis of the vertical center axis on the upper surface side of the tank flange 10 is the same. In this way, the flange cover 18 is detachably attached, the case main body 20 is fixed to the lower surface side of the tank flange 10 with the center axis of the vertical direction being the same, and the lower end surface of the case main body 20 is covered. And a bottom plate 21 fixed to the base plate. The tank flange 10, the flange cover 18, the case body 20, and the bottom plate 21 are formed of a non-ferrous metal such as an aluminum alloy or a metal material such as iron.

  Further, the filter case 2 has an element disposition space S1 in which the filter element 3 can be disposed, and a hollow pipe-like return side pipe 7 is communicated from a case inflow hole 20a on the side surface of the case body 20. Thus, the return oil that passes 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 as shown in FIG. 2, screw holes 11b that can be screwed with fixing bolts 11a for attaching the flange cover 18 are equidistantly arranged in the circumferential direction on the upper surface. An element insertion hole 12 through which the filter element 3 can be inserted is formed at the center. The inner peripheral portion of the tank flange 10 that forms the element insertion hole 12 is formed in a stepped shape having a small diameter portion 12a, an intermediate diameter portion 12b, and a large diameter portion 12c. Two first hook members 15 are attached at equal intervals in the circumferential direction by hook fixing bolts 16 to the end surface portion connecting the middle diameter portion 12b and the large diameter portion 12c. As shown in FIG. 3, the first hook member 15 includes a hook flat plate portion 15a having a through hole 15c through which the hook retaining bolt 16 can be inserted, and a hook protrusion 15b extending downward from the hook flat plate portion 15a. When the hook flat plate portion 15a is attached to the end surface portion groove connecting the medium diameter portion 12b and the large diameter portion 12c by the hook fixing bolt 16, the hook protrusion portion 15b protrudes inward of the medium diameter portion 12b. It will be located in the state. An O-ring 14 is disposed on the large diameter portion 12c.

  As shown in FIG. 1, the flange cover 18 is formed in a disk shape having a circular groove that accommodates a part of the element cover 4 on the lower surface side, and the outer diameter of the flange cover 18 is that of the tank flange 10. It is set to the same size as the outer diameter. The flange cover 18 has a plurality of through holes 11c formed at equal intervals in the circumferential direction, and screw holes 11b formed in the tank flange 10 by inserting the fixing bolts 11a into the through holes 11c. By screwing, the flange cover 18 is detachably attached to the tank flange 10 so as to close the opening of the oil tank 6. Further, since the O-ring 14 disposed on the tank flange 10 is pressed and sealed so that the flange cover 18 is crushed, dust and dust are prevented from entering the filter case 2 from the outside.

  Next, the filter element 3 that is detachably disposed in the element disposition space S1 of the filter case 2 in order to filter the return oil will be described. As shown in FIG. 4B, the filter element 3 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, a protector. The upper end plate 45 is fixed to the upper end surface of the upper end plate 45, 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.

  As shown in FIG. 1, the protector 30 is configured so that a predetermined inflow space S <b> 2 (a space constituting a part of the element arrangement space S <b> 1) is formed on the inner peripheral surface of the case body 20. Is formed in a cylindrical shape with an outer diameter smaller than the inner diameter, and a plurality of protector flow holes 31 punched and penetrated from the outside to the inside are formed on the upper side of the side wall as a pair of upper and lower at equal intervals in the circumferential direction. Is formed. Moreover, since the protector 30 is formed of resin as described above, a logo mark or the like can be raised and displayed on the outer peripheral surface.

  The filter medium 40 is formed in a cylindrical shape with an outer diameter smaller than the inner diameter of the protector 30 so that a predetermined outer peripheral space S3 is formed with respect to the inner peripheral surface of the protector 30, and the inner peripheral surface is the inner tube 41. It is mounted so as to come into contact with and contact the outer peripheral surface of the. 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 outer peripheral space S3 is communicated with the inflow space S2 by a plurality of protector flow holes 31.

  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 S4 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 S4. 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 disk shape, and as shown in FIG. 4A, a gasket 47 made of an elastic material such as rubber is disposed at the central inner diameter portion. An element upper center hole 47a into which a later-described fourth outer portion 75 of a valve retainer 73 can be fitted is formed at the center of the gasket 47, and the fourth outer portion 75 is inserted into the element upper center hole 47a. As a result, the fourth outer portion 75 receives a certain holding force by the elastic force of the gasket 47 and is fitted and held. In addition, the lower end portion of the upper end plate 45 has a cylindrical groove in which the upper ends of the protector 30, the filter medium 40, and the inner tube 41 can be fitted, and protrudes upward from the upper surface portion. Furthermore, the 2nd hook latching | locking part 46 bent and extended in the circumferential direction is formed.

  The lower end plate 49 is formed with a cylindrical pipe support portion 49a protruding upward in the internal space S4 of the inner tube 41. The upper inner portion of the pipe support portion 49a is made of an elastic material such as rubber. A formed gasket 50 is disposed. An element lower center hole 50a into which the outlet pipe 8 can be inserted and removed is formed on the inner side 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 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. Further, the gasket 50 can be fitted to an outer peripheral portion of a cap portion 60b of the lower swing holder 60 described later.

  As shown in FIG. 1, the holder 55 is disposed in the inner space S <b> 4 of the inner tube 41, and includes an upper fixed holder 56, a coil spring 58, and a lower swing holder 60. The upper fixed holder 56 has an outer peripheral surface joined to the inner peripheral surface of the inner tube 41 by welding or the like. An upper holder oil passage hole 56a is formed at the center of the upper fixed holder 56 to allow oil to flow, and a lower outer portion that protrudes downward and extends to form the upper holder oil passage hole 56a. The inner diameter of the coil spring 58 is in contact with and supported by. Further, the strength of the inner tube 41 can be increased by providing the upper fixing holder 56 on the inner peripheral portion of the inner tube 41.

  One end of the coil spring 58 is supported by the lower swing holder 60 and the other end is supported by the upper fixed holder 56 so as to be sandwiched between the lower swing holder 60 and the upper fixed holder 56.

  The lower swing holder 60 is swingable up and down within the inner space S4 of the inner tube 41 by the urging force of the coil spring 58 as shown by a chain line in FIG. Further, it is detachable through fins 62. As shown in FIG. 5B, the lower swing holder 60 includes a holder outer cylinder portion 60a formed in a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the inner tube 41, and a cylindrical tray-shaped cap portion 60b. And plate-like ribs 60c that connect the inner peripheral surface of the holder outer tube portion 60a and the outer peripheral upper end portion of the cap portion 60b at equal intervals in the circumferential direction, and fins 62 disposed on the lower surface of the cap portion 60b. The The holder outer cylinder portion 60a has rounded chamfered corners at the upper and lower ends so as not to be caught on the inner periphery of the inner tube 41 when the lower swing holder 60 swings up and down in the inner tube 41. The outer peripheral portion of the cap portion 60b is formed so as to be inserted into and fitted into the element lower center hole 50a of the gasket 50. At the center of the upper surface of the rib 60c, an arc-shaped plate body is provided so as to protrude upward in plan view, and supports the inner diameter of the coil spring 58. Moreover, between the inner peripheral surface of the holder outer cylinder part 60a and the outer peripheral surface of the cap part 60b, as shown in FIG. 5 (A), a substantially fan-shaped lower holder oil passage hole 60d is provided in the circumferential direction in a plan view. The ribs 60c are formed at equal intervals.

  As shown in FIGS. 5B and 5C, a plurality of fins 62 are provided so as to protrude downward at equal intervals in the circumferential direction from the lower surface side of the cap portion 60 b of the lower swing holder 60. A fin fitting portion 62 a that can be fitted to the inner diameter portion of the outlet pipe 8 so as to be detachable from the outlet pipe 8 is formed below each of the plurality of fins 62. Further, since the lower side of the fin fitting portion 62a is formed in a tapered shape, it can be easily inserted into the outlet pipe 8. Since the plurality of fins 62 are provided at equal intervals in the circumferential direction, the internal space S4 has a fin oil passage 62b between the fins 62 and is fitted to the outlet pipe 8. The oil inside can flow into the outlet pipe 8 through the fin oil passage 62b.

  The element cover 4 is detachably attached to the upper end plate 45 of the filter element 3. As shown in FIGS. 6B and 7, the element cover 4 includes a handle flange 70 formed in a substantially disc shape, and a handle 77 attached to the upper end of the center of the handle flange 70 by a handle fixing bolt 77a. And a valve retainer 73 provided at a lower portion of the handle flange 70, a second hook portion 76 formed so as to protrude outside the valve retainer 73, 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 retainer 73 is formed from the inflow space S2 toward the internal space S4. As shown in FIGS. 6 (A) and 6 (B), the outer side of the handle flange 70 is composed of a first outer part 71 and a second outer part 72. Six arc-shaped notches 71a are formed at equal intervals in the circumferential direction, and have an outer diameter smaller than the inner diameter of the diameter portion 12b. The handle flange 70 is inserted into the inner peripheral portion 12 of the tank flange 10 so that the hook flat plate portion 15a of the first hook member 15 is inserted into the notch portion 71a, and the handle flange 70 is horizontal until it hits the hook protrusion 15b. By turning in the direction, as shown in FIG. 1, the first outer portion 71 of the handle flange 70 and the first hook member 15 are engaged.

  The second outer portion 72 has an outer diameter slightly smaller than the small-diameter portion 12 a of the tank flange 10, and an O-ring groove 72 a 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. .

  As shown in FIG. 7, the valve retainer 73 includes a third outer portion 74, a fourth outer portion 75, and a fixing screw portion 78 in which a male screw is formed in the upper portion, and a screw hole portion of the handle flange 70. The fixing screw portion 78 is screwed to 70b to be attached to the lower portion of the handle flange 70. The third outer portion 74 is provided with a pair of second hook portions 76 extending outward. Moreover, as shown in FIG. 6 (B), the lower end of the fourth outer portion 75 is in contact with the upper surface of the valve 80a of the relief valve 80, thereby closing one end of the relief oil passage 70a.

  The pair of second hook portions 76 includes a plate portion 76a extending outward from the third outer portion 74 of the handle flange 70 and a hook portion 76b bent upward from the outer end of the plate portion 76a. It is formed so that it can be engaged with each other by being hooked on a pair of second hook engaging portions 46 formed at the upper end of 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 disposed to receive the lower end of the valve spring 80c, and a receiving nut 80e that can be screwed with the support bolt 80b. The valve 80a is always in contact with the lower end surface of the fourth outer portion 75 of the valve retainer 73 by the urging force of the valve spring 80c, and is closed so that the relief oil passage 70a and the inner space S4 in the inner tube 41 do not communicate with each other. is doing. Further, when the valve 80a is opened against the urging force of the valve spring 80c (pressed downward), the relief oil passage 70a and the inner space S4 of the inner tube 41 communicate with each other.

  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 element cover 4 to the filter element 3 will be described. The element cover 4 is attached to the filter element 3 at an upper portion of the filter element 3. A filter in which a handle 77 of the element cover 4 is grasped with a palm, and a relief valve 80 projecting downward from the element cover 4 is opened by an element upper center hole 47a of the upper end plate 45 as shown in FIG. The element is inserted into the element 3 from above, and the pair of second hook portions 76 are engaged with the pair of second hook engaging portions 46 of the upper end plate 45 so as to be hooked with each other. By connecting the element cover 4 to the filter element 3 in this manner, the handle 77 can be easily carried by grasping the handle 77 with a palm, and the filter element 3 can be brought to the filter case 2.

  Next, as shown in FIG. 9, since the filter element 3 is attached to the filter case 2 from the element insertion hole 12 of the tank flange 10, the fixing bolt 11a is first removed, and the flange cover 18 is attached to the tank. The state is removed from the 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 3 straight from the element insertion hole 12 of the tank flange 10 into the element arrangement space S <b> 1 of the case body 20. When the filter element 3 is inserted downward and the fin 62 of the filter element 3 reaches the outlet pipe 8 protruding upward from the center of the bottom plate 21, the fin fitting portion 62a and the outlet pipe 8 are fitted. Let

  Further, when the filter element 3 is inserted downward, as shown in FIG. 10, the gasket 50 is also swung downward so that the cap portion 60b of the lower rocking holder 60 and the gasket 50 are disengaged. The lower swing holder 60 is swung so as to approach the upper fixed holder 56 against the urging force of the coil spring 58. At this time, since the coil spring 58 guides the lower swing holder 60 to swing straight upward, the lower swing holder 60 and the inner tube 41 can be prevented from being rubbed and worn. Further, since the holder outer cylinder portion 60 a of the lower swing holder 60 is formed in a cylindrical shape, the lower swing holder 60 is restricted from being turned up and down within the inner tube 41.

  Further, when the urging force of the coil spring 58 becomes larger than the weight of the filter element 3, the operator needs to insert the filter element 3 so as to push down against the urging force. Therefore, when the operator applies a force that grabs the handle 77 and pushes it downward, the second hook portion 76 comes out of contact with the second hook engaging portion 46 of the upper end plate 45, and the fourth outer portion. 75 is inserted into the element upper center hole 47a of the gasket 47, and the lower end surface of the third outer portion 74 is brought into contact with the upper end surface of the gasket 47, so that the downward pressing force is applied to the contact portion. The filter element 3 can be inserted stably. On the other hand, the gasket 50 of the lower end plate 49 is disconnected from the lower swing holder 60 and is slid downward with respect to the outer peripheral portion of the outlet pipe 8 with a constant fitting force by the elastic force of the gasket 50.

  When the handle flange 70 reaches a position where it reaches the element insertion hole 12 of the tank flange 10, the first hook member 15 is aligned so as to pass through the notch 71 a of the first outer portion 71, and the handle flange 70 is moved to the element. The valve retainer 73 is inserted into the insertion hole 12 so that the valve retainer 73 is fitted into the gasket 47. At this time, the filter element 3 and the element cover 4 are biased so as to swing upward due to the biasing force of the coil spring 58, but the handle flange 70 is engaged with the first hook member 15 in a plan view. By rotating clockwise, the first outer portion 71 is abutted against the hook protrusion 15b of the first hook member 15, and the upper surface portion of the first outer portion 71 biased upward from the coil spring 58 is The first hook member 15 is held in contact with the lower surface portion. As a result, the filter element 3 and the element cover 4 are restricted from swinging upward, so that the filter element 3 and the element cover 4 are held in this state even if the operator releases the hand from the handle 77.

  After the filter element 3 is mounted, the flange cover 18 is attached to the tank flange 10 by the fixing bolt 11a. As described above, the filter element 3 and the fill cover 4 are urged upward and pop out. Since the engagement between the first hook member 15 and the first outer portion 71 is restricted, the operator can easily attach the flange cover 18. When the flange cover 18 is attached, as shown in FIG. 11, the center lower surface portion of the flange cover 18 pushes the element cover 4 biased upward by the coil spring 58 downward from the upper end surface of the handle flange 70. It becomes. Accordingly, the contact between the upper surface portion of the first outer portion 71 and the lower surface portion of the first hook member 15 is released, and the urging force of the coil spring 58 is received by the flange cover 18. Stability can be increased even more than when receiving with. In this way, the coil spring 58 always urges the filter element 3 and the element cover 4 upward and the flange cover 18 receives them, so that the filter element 3 is firmly held in the filter case 2 so that the behavior of the filter element 3 is maintained. Can be suppressed and can also serve as a set spring.

  Further, when the flange cover 18 is attached, the first outer member 71 is brought into contact with the first hook member 15 and the first hook member 15 receives the urging force of the coil spring 58 as described above. Therefore, when the flange cover 18 is attached, the positioning of the flange cover 18 and the fastening of the fixing bolt 11a can be easily performed. In this way, the filter element 3 is mounted and firmly held in the element arrangement space S1.

  Furthermore, the element cover 4 provided with the handle 77 for attaching / detaching the filter element is provided with a relief oil passage 70a and a relief valve 80, and the oil filter 1 is used with the element cover 4 attached. be able to.

  Next, the flow of return oil filtered by the oil filter 1 with the filter element 3 attached as described above will be described with reference to FIG. In FIG. 1, the oil flow is represented by an arrow F. The return oil flows from the outside of the oil tank 6 into the inflow space S2 in the filter case 2 through the return side pipe 7. At this time, the inside of the oil tank 6 is 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 2 is increased from L0 to L1. Yes. The return oil flowing into the inflow space S <b> 2 is changed in the direction of flow by hitting the outer wall of the protector 30, flows upward in the inflow space S <b> 2, and the protector circulation hole formed on the upper side of the protector 30. 31 and flows into the external space S3 of the filter medium 40. As a result, the outer wall of the protector 30 can act as a baffle to rectify the flow of the return oil, and the provision of the protector 30 allows the return oil to be directly passed from the return side pipe 7 to the filter medium 40. In this case, the filter medium 40 is not damaged. In addition, even when the inner pressure of the protector 30 is compressed inward due to the pressure of the oil flowing in from the return side pipe 7, and the inner periphery of the protector 30 is compressed inward, it is constant between the protector 30 and the filter medium 40. Therefore, the protector 30 is not brought into contact with the filter medium 40 and does not block the external space S3 that serves as an oil passage for the oil.

  Since the relief valve 80 is normally closed, even if there is oil flowing from the inflow space S2 to above the upper end plate 45 and flowing into the relief oil passage 70a, this oil will remain in the inner tube 41. Therefore, there is no possibility that oil that has not been filtered flows into the oil tank 6. Further, in the lower part of the filter element 3, the gasket 50 of the lower end plate 49 is fitted to the outer peripheral part of the outlet pipe 8 with a constant fitting force by the elastic force of the gasket 50. The oil in the inflow space S2 does not flow in.

  The oil that has flowed into the outer circumferential space S3 flows from the outside to 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 oil filtered by the filter medium 40 flows into the internal space S4 through the tube flow hole 42 of the inner tube 41. In addition, since the inner periphery is contact | abutting to the outer periphery of the inner tube 41, even if oil flows in from the outer peripheral side, the filter medium 40 will be pushed inside and will not deform | transform. Here, the oil that flows into the upper side of the internal space S4 flows from the upper holder oil passage hole 56a of the upper fixed holder 56 into the lower holder oil passage hole 60d of the lower swing holder 60, and then the fin oil passage hole 62b. And flows into the outlet pipe 8 and flows out to the oil tank 6 (outside the oil filter 1). The oil that has flowed into the center side of the internal space S4 passes through the fin oil passage 62b from the lower holder oil passage hole 60d of the lower swing holder 60 and flows into the outlet pipe 8 to flow out to the oil tank 6. Is done. Furthermore, the oil that has flowed into the lower side of the internal space S4 flows into the outlet pipe 8 from the fin oil passage 62b and flows out to the oil tank 6. At this time, since the lower swing holder 60 is fitted to the outlet pipe 8 and further biased downward by the coil spring 58, it is not swung left and right or up and down by the oil flowing into the internal space S4.

  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 S4 becomes a predetermined pressure or more. Therefore, the oil flowing into the relief oil passage 70a acts on the valve 80a with a force greater than the urging force of the valve spring 80c, and the valve 80a is pushed downward against the urging force of the valve spring 80c to open the valve. To do. As a result, the relief oil passage 70a and the internal space S4 are communicated with each other, and the oil flows into the internal space S4 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. Like to do.

  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 3 periodically (every predetermined time). Is performed in the reverse order of installation. Before replacing the filter element 3, the pressure in the oil tank 6 is always reduced to atmospheric pressure by an air breather provided in the oil tank 6. When the pressure in the oil tank 6 reaches atmospheric pressure, the oil level in the oil tank 6 is lowered and the oil in the filter case 2 is also lowered to the oil level L0.

  First, after removing the flange cover 18 from the tank flange 10, the filter element 3 is pulled upward by grasping the handle 77 of the element cover 4 with a palm and lifting it. When the filter element 3 is pulled upward, the gasket 50 fitted to the outlet pipe 8 slides upward with respect to the outlet pipe 8 with a constant fitting force due to the elastic force of the gasket 50. Become. At this time, the fitting force between the fin 62 of the lower swing holder 60 and the outlet pipe 8 is more strongly connected than the fitting force between the gasket 50 and the outlet pipe 8, and the coil spring 58 is Therefore, even if the filter element 3 is pulled upward, the fin 62 does not come out of the outlet pipe 8. Further, after the gasket 50 is slid upward and comes out of the outlet pipe 8, the gasket 50 passes through the outer peripheral portion of the fin 62 and reaches the cap portion 60 b of the lower swing holder 60 as shown in FIG. 9. Since the fitting is performed, the element lower center hole 50a of the gasket 50 is closed by the cap portion 60b. When the filter element 3 is lifted upward from this state, the upper surface portion of the gasket 50 is brought into contact with the lower surface of the rib 60c of the lower swing holder 60, and the force for the operator to lift the filter element 3 upward is the outlet piping. In addition to acting to pull out the fin 62 from 8, the gasket 50 is securely fitted to the cap portion 60b by receiving this force. In this way, by pulling out the fins 62 from the outlet pipe 8, the filter element 3 can be separated from the case body 20, and the filter element 3 can be discharged from the filter case 2.

  As shown in FIG. 8, the filter element 3 discharged from the filter case 2 has an element lower center hole 50a that opens at the center of the lower end plate 49, and is firmly closed by a cap portion 60b. The oil remaining inside does not leak from the element lower center hole 50a. And when discharging | emitting and conveying the filter element 3 from the filter case 2, while the upper part of the filter element 3 is covered with the element cover 4, the protector flow hole 31 of the protector 30 is provided in the upper part. The residual oil in the filter element 3 does not splash and get on the worker, and the surroundings are not soiled. Furthermore, the oil that flows down along the surfaces of the filter medium 40 and the inner tube 41 falls in the external space S3 and the internal space S4 in the filter element 3 and is contained therein, so that it can be prevented from dripping on the floor surface of a work place or the like. Further, since the handle 77 of the element cover 4 is attached so as not to come into contact with the oil, the operator's hand does not touch the oil when the filter element 3 is discharged, and the oil is secondarily surrounded by the operator's hand. Is prevented from being scattered.

  Further, in the case main body 20 from which the filter element 3 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.

  Furthermore, impurities such as dust trapped in the filter medium 40 may be separated from the filter medium 40 and fall downward when the filter element 3 is discharged or when the engine is stopped. Since the external space S3 is formed with a predetermined clearance therebetween, all of the impurities are enclosed in the external space S3, and the impurities can be prevented from accumulating in the case body 20. Therefore, the maintenance burden in the case main body 20 can be reduced.

  After the filter element 3 is discharged from the filter case 2, the element cover 4 is released from the engagement of the second hook portion 76 of the element cover 4 and the second hook engaging portion 46 of the upper end plate 45. 4 can be easily removed from the filter element 3. The element cover 4 removed from the filter element 3 can be used repeatedly by attaching it to a new (unused) filter element 3.

  According to the oil filter 1 configured as described above, the filter element 3 can be easily replaced, so that maintenance workability is improved and when the filter element 3 is extracted from the filter case 2 for replacement. However, impurities trapped by the filter medium 40 and unfiltered oil do not flow out to the outlet pipe 8, and the oil in the oil tank 6 can always be kept clean. Further, even after the filter case 3 is extracted, there is no possibility that the oil remaining in the filter element 3 leaks out or scatters and stains the surroundings.

  In the above embodiment, the fins 62 of the lower swing holder 60 are formed in the shape of an elongated plate extending downward. However, the present invention is not limited to this. In order to guide the flow of oil that has flowed into S4 into a vortex and guide it to the outlet pipe 8, a configuration may be adopted in which fins 162 are formed in a blade shape as shown in FIG. Further, by forming a fin fitting portion 162 a having an outer diameter slightly smaller than the inner diameter of the outlet pipe 8 at the lower portion of the fin 162, the fin 162 can be fitted with the outlet pipe 8.

  Further, as shown in FIG. 13, a pipe protrusion 163 is provided so as to protrude upward from the tip of the outlet pipe 8 without providing the fin 62 on the lower swing holder 60, and at the lower end of the lower swing holder 60. It is good also as a structure which provides the protrusion receiving part 164 which has an attachment hole which can be fitted to this piping protrusion 163. FIG. In this case, a larger oil passage for the oil to the outlet pipe 8 can be secured than when the fins 62 are provided by fitting the pipe protrusions 163 and the protrusion receivers 164 together. Further, when the filter element 3 is pulled upward so as to be discharged from the filter case 2, the cap portion 60b is fitted with the gasket 50, and the cap portion 60b is connected to the element lower center hole 50a as in the above embodiment. Therefore, the oil remaining in the filter element 3 does not leak from the element lower center hole 50a.

  Further, in the above embodiment, the lower swing holder 60 is supported by the coil spring 58 and swings up and down with respect to the upper fixed holder 56. However, the present invention is not limited to this. The lower swing holder 60 may be provided in a free state without providing the coil spring 58. When the filter element 3 is inserted into the filter case 2, the fin 62 and the outlet pipe 8 can be fitted with the outlet pipe 8 pushed up so that the lower swing holder 60 contacts the upper fixed holder 56. Further, when the filter element 3 is extracted from the filter case 2, the upper surface portion of the gasket 50 pushes the lower swing holder 60 upward by lifting the filter element 3 upward, and the fitting between the fin 62 and the outlet pipe 8 is released. It will be. In this state, when the cap portion 60b is fitted into the element lower center hole 50a of the gasket 50, the element lower center hole 50a of the gasket 50 is blocked by the cap portion 60b. Does not leak from the element lower center hole 50a. When the coil spring 58 is not provided, it is preferable that a set spring is provided outside the filter element 3 and the set spring urges the filter element 3 to be firmly held in the filter case 2.

  Further, in the above embodiment, the flange cover 18 is provided to cover the upper portion of the tank flange 10. However, since the element cover 4 closes the opening of the tank flange 10, the oil in the filter case 2 is outside. In addition, since the dust and the like are prevented from entering the filter case 2, the opening of the tank flange 10 can be closed only by the element cover 4. However, since the element cover 4 is not exposed by providing the flange cover 18, it is possible to reliably prevent dust from entering the filter case 2 from the outside or rainwater entering due to work in rainy weather. Further, it is preferable to provide the flange cover 18 because the handle 77 is prevented from being soiled and the operator's hand and clothes are not soiled. Further, by forming the element cover 4 and the flange cover 18 integrally, the number of parts may be integrated to improve maintenance workability.

  In the above embodiment, the handle flange 70 (first outer portion 71) is engaged with the first hook member 15. However, the present invention is not limited to this, and as shown in FIG. A ring member 91 and a plate member 92 that are screwed to the flange 10 ′ may be provided, and the handle flange 70 may be engaged with the ring member 91 and the plate member 92. As shown in FIGS. 15A and 15B, the ring member 91 has an inner diameter portion 91a having substantially the same diameter as the small diameter portion 12a of the tank flange 10 '. The inner diameter portion 91a is recessed from the upper end surface. In the plan view, substantially fan-shaped first engagement grooves 91b are formed at equal intervals in the circumferential direction. The inner peripheral wall of the first engagement groove 91 b is formed to have a larger diameter than the first outer portion 71. As shown in FIG. 16, the plate member 92 has an inner diameter portion 92a having substantially the same diameter as the small diameter portion 12a of the tank flange 10 '. The inner diameter portion 92a has a first engaging groove 91b in the ring member 91. The second engagement grooves 92b are formed at equal intervals in the circumferential direction at corresponding positions. Then, the first engagement groove 91b of the ring member 91 and the second engagement groove 92b of the plate member 92 are aligned so as to overlap (positions such that the center lines X1 and X2 of the both engagement grooves coincide with each other). Screwed to the tank flange 10 '.

  In this case, the first outer portion 71 of the handle flange 70 is inserted through the second engagement groove 92b of the plate member 92 and further reaches the first engagement groove 91b of the ring member 91, and then the plane is flat. It can be engaged by rotating clockwise by visual observation. At this time, the circumferential width W2 of the second engagement groove 92b is set smaller than the circumferential width W1 of the first engagement groove 91b. The upper surface portion of the biased first outer portion 71 comes into contact with and is held in contact with the lower surface portion of the plate member 92. Therefore, the filter element 3 and the element cover 4 can be held in a more stable state by using the ring member 91 and the plate member 92 having higher strength than the first hook member 15.

  Further, as shown in FIG. 14, a thin ring-shaped wiper 17 made of an elastic member such as rubber may be disposed between the tank flange 10 ′ and the ring member 91 in the element insertion hole 12. As shown in FIG. 17, the wiper 17 has an inner diameter portion 17a that is smaller than the outer diameter of the protector 30, and cut 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, when the filter element 3 is extracted from the filter case 2, the protector 30 passes through the inner diameter portion 17 a of the wiper 17 so as to push and expand (upward), so that the wiper 17 adheres to the outer periphery of the protector 30. Will be scraped off. For this reason, when discharging the filter element 3, it can suppress more that the oil adhering to the protector 30 dripping around.

  Further, in the above embodiment, the filter element 3 and the element cover 4 are connected by the engagement between the second hook locking portion 46 and the second hook portion 76, but the present invention is not limited to this. Alternatively, the filter element 3 and the element cover 4 may be detachably connected by screw fastening. Further, the filter element 3 and the element cover 4 may be integrated without being separated so that the number of parts can be aggregated to improve maintenance workability.

  In the present embodiment, the upper fixed holder 56 is provided by being joined to the inner tube 41 by welding or the like, but is not limited thereto, and for example, these may be configured by resin integral molding. . In addition, a protrusion-like rail extending in the vertical direction is provided on the inner peripheral portion of the inner tube 41 by resin molding, and a guide groove into which the rail can be inserted is provided in the holder outer cylindrical portion 60a of the lower swing holder 60. It is good. At this time, the lower swing holder 60 is guided along the rail of the inner tube 41 and can swing up and down.

  Furthermore, in the present embodiment, the handle 77 is attached to the center upper end of the handle flange 70 by the handle fixing bolt 77a and is in an upright state. However, the present invention is not limited to this, and for example, an upright position (lifting position) And may be configured to be swingable between the lying position and the lying position. When removing the filter element 3 from the filter case 2, the filter element can be lifted upward by placing the handle in an upright position, grasping the handle with a palm and lifting the handle. When the filter element 3 is mounted in the filter case 2, the handle is grasped with a palm and the filter element 3 is inserted into the filter case 2. Therefore, even if the size of the handle is designed to be large so that the handle can be easily held, the space for storing the handle does not increase.

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 tank flange which comprises a part of said oil filter. (A) is a top view which shows the 1st hook member which comprises a part of said oil filter, (B) is a side view of a 1st hook member. (A) is a top view which shows the filter element which comprises a part of said oil filter, (B) is principal part sectional drawing of the side surface of a filter element. (A) is a top view which shows the lower swing holder which comprises a part of said oil filter, (B) is sectional drawing of the side surface of a lower swing holder, (C) is the bottom face of a lower swing holder FIG. (A) is a top view which shows the element cover which comprises some oil filters, (B) is sectional drawing of the side surface of an element cover, (C) is a bottom view of an element cover. It is an exploded sectional view of the side showing an element cover which constitutes a part of the oil filter. It is side surface sectional drawing which shows the state which attaches an element cover to the filter element which comprises some oil filters. It is side surface sectional drawing which shows the state in the middle of the filter element which comprises a part of said oil filter being mounted in a filter case. It is side surface sectional drawing which shows the state with which the filter element which comprises some oil filters was mounted in the filter case. It is side surface sectional drawing which shows the state which attached the flange cover to the filter case which comprises some oil filters. It is a bottom view which shows another form of the lower rocking | fluctuation holder which comprises a part of said oil filter. It is principal part sectional drawing which shows another form of the fitting state of the outlet piping and lower swing holder in the said oil filter of FIG. It is side surface sectional drawing which shows another form of the tank flange which comprises a part of said oil filter. (A) is a top view which shows the ring member with which the tank flange of another form of FIG. 14 is equipped, (B) is side sectional drawing of a ring member. It is a top view which shows the plate member with which the tank flange of another form of FIG. 14 is equipped. It is a top view which shows the wiper with which the tank flange of another form of FIG. 14 is equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil filter 2 Filter case 3 Filter element 6 Oil tank 7 Return side piping 8 Outlet piping 50 Gasket 50a Element lower center hole (element discharge hole)
58 Coil spring 60 Lower swing holder 60a Holder outer cylinder portion 60b Cap portion 62, 162 Fin 62b Fin oil passage 163 Pipe projection 164 Projection receiver S1 Element installation space S2 Inflow space S3 Outer space S4 Internal space

Claims (5)

A filter case fixed in an oil tank for storing oil, having an element disposition space inside, an inflow hole formed in the side surface and an outflow hole formed in the bottom;
A return side pipe that is inserted into the inflow hole from the outside of the oil tank and communicates the outside with the element arrangement space;
An outlet pipe that is inserted from the oil tank into the outflow hole and extends upward in the element arrangement space, and communicates the inside of the oil tank and the element arrangement space;
The element has an element discharge hole formed at the bottom so that the outlet pipe can be inserted, and the element disposition space is divided into an inflow space communicating with the return side pipe and an outflow space communicating with the outlet pipe. An oil filter that is mounted in an element disposition space and includes a filter element that projects the outlet pipe from the element discharge hole into the outflow space,
With respect to the first discharge part and the element discharge hole which are detachable from the front end port of the outlet pipe so as to form an oil passage opening communicating with the outflow space and the outlet pipe in the filter element. A swing lid member comprising a second detachable connecting portion and swingable up and down in the outflow space of the filter element; and disposed in the outflow space and above the swing lid member. And a biasing member that biases the swing lid member downward,
In a state where the filter element is mounted in the filter case, the first connecting portion of the swing lid member is mounted at the tip end of the outlet pipe, and the urging member is mounted on the swing cover member. The fluid is energized so as not to be detached from the outlet pipe, and the fluid introduced from the outside through the return side pipe into the inflow space is filtered through the filter element, and then the first from the outflow space. Through the oil passage port of the connecting portion, the outlet pipe flows out into the oil tank,
In a state where the filter element is removed from the filter case, the swing lid member is detached from the outlet pipe, and the second connecting portion is attached to the element discharge hole, thereby closing the filter element bottom. And an urging member configured to urge the swing lid member so as not to be detached from the element discharge hole. The first connecting portion is formed at a lower portion of the swing lid member and includes a plurality of fitting protrusions that can be fitted to the distal end port of the outlet pipe.
2. The oil according to claim 1, wherein a gap formed between the plurality of fitting protrusions serves as the oil passage port when the plurality of fitting protrusions are fitted to the outlet pipe. filter.   The oil filter according to claim 2, wherein the fitting protrusion of the first connecting portion is formed in a blade shape. The element discharge hole is composed of an inner diameter portion of a ring-shaped elastic member disposed at the bottom of the filter element,
When the filter element is removed, the element discharge hole also moves upward along the outer periphery of the outlet pipe by pulling the filter element upward, and the second connecting portion of the swing lid member is moved to the element discharge hole. 4. The oil filter according to claim 1 , wherein the first connecting portion of the swing lid member is detached from the distal end port of the outlet pipe after being mounted on the oil pipe. 5. The oil filter according to any one of claims 1 to 4 , wherein the swing lid member has a hollow cylindrical outer cylinder portion having an outer diameter slightly smaller than an inner peripheral surface of the filter element. .

Images