JP2019038052A - Oil seal removal jig - Google Patents

Abstract

To provide an oil seal removal jig which enables a worker to conduct work easily and safely without causing damage to a bearing housing when removing an oil seal.SOLUTION: An oil seal removal jig 1 is used to remove a ring shaped oil seal 6 attached to a bearing housing 5 and has: a jig power unit 2 which is provided in a manner such that the jig power unit 2 can rotate around its axis; a jig fixing part 3 which extends in a radial direction orthogonal to an axial direction of the jig power unit 2 and is placed in contact with an oil seal attachment side end surface 51 of the bearing housing 5 to fix the jig; and a spreading wedge part 4 which spreads along the jig fixing part 3 by using rotational force of the jig power unit 2 as a driving source and is inserted into a space between the oil seal 6 and a groove part 52 of the bearing housing 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil seal removing jig used when removing a ring-shaped oil seal attached to a bearing housing.

  The bearing housing supports, for example, a rotating shaft provided on a flap-type door body in a lock gate or a sluice gate. The bearing housing is provided with various bearings such as a rolling bearing and a sliding bearing in order to smoothly rotate the rotating shaft. Further, a lubricating oil for improving the friction reduction performance of the bearing is filled between the bearing and the rotating shaft.

  The oil seal attached to the bearing housing is for preventing the filled lubricating oil or the like from leaking outside. The oil seal also functions to prevent foreign matters such as dust from entering the inside from the outside. Therefore, the oil seal is fitted to the bearing housing in a state of high sealing performance.

  On the other hand, the oil seal is a consumable item that is consumed as the rotary shaft rotates, and needs to be removed and replaced with a new one. Conventionally, the oil seal is removed by piling a tool such as a flathead screwdriver or a bar between the oil seal 6 and the bearing housing 5 as shown in FIG. However, this method may damage the bearing housing 5 with a tool. The oil seal 6 is required to have high sealing performance as described above, and if the contact surface 53 between the oil seal 6 and the bearing housing 5 is damaged, the bearing housing 5 itself needs to be replaced, which increases the cost of maintenance. Resulting in. Moreover, there is also a problem that the tool slips due to excessive force when removing the oil seal 6 and rebounds to the operator to cause injury. Therefore, such a removal method using a tool such as a flat-blade screwdriver requires careful work and requires a lot of labor and time.

  So far, inventions relating to jigs for removing the oil seal have been proposed. For example, in Utility Model Registration No. 3184830, a first end portion having a first screw hole, and a second end portion having a second screw hole in which the winding direction of the screw is opposite to that of the first screw hole. A substantially columnar member having an end; a first bolt member screwed into a first screw hole of the substantially columnar member; and a second bolt screwed into a second screw hole of the substantially columnar member. An oil seal removal jig characterized by having a member has been proposed (Patent Document 1). According to this Patent Document 1, an oil seal is formed by rotating the substantially columnar member and projecting the right wedge bolt and the left wedge bolt in the left-right direction by the wedge force of the wedge surfaces of the first bolt and the second bolt. Can be lifted from the bearing housing.

Utility Model Registration No. 3184830

  However, in the invention described in Patent Document 1, since the first bolt and the second bolt are projected along the axial direction of the substantially columnar member, an electric motor such as an impact wrench is provided at the end of the substantially columnar member. A rotating tool that can be continuously rotated by, for example, cannot be fitted. Therefore, in order to rotate the substantially columnar member in the axial direction, the substantially columnar member must be gripped with a bare hand or the like from the lateral direction, slightly rotated, then regripped and rotated many times. Therefore, there is a problem that considerable time and labor are required in order to completely raise the oil seal.

  Further, in order to project the first bolt member and the second bolt member in the left-right direction, each bolt must be rotated relative to the substantially columnar member. However, simply rotating the substantially columnar member does not allow each bolt member to rotate around and extend. Therefore, it is necessary to rotate only the substantially columnar member while holding the bolt members so that they do not rotate. However, it is difficult to press each bolt member in a limited space on the inner peripheral side of the oil seal.

  Furthermore, unless each bolt member is inserted accurately between the oil seal and the bearing housing, the contact surface between the oil seal and the bearing housing will be damaged. However, since the substantially columnar member and each bolt member are not fixed to the bearing housing, accurate positioning is extremely difficult.

  The present invention has been made to solve the above-described problems, and is capable of easily and safely performing work without damaging the bearing housing when the oil seal is removed. The purpose is to provide ingredients.

  The oil seal removing jig according to the present invention can use a rotating tool that can be continuously rotated by electric power, etc., and can solve the problems of preventing rotation due to shaft rotation and facilitating positioning. An oil seal removing jig for removing the ring-shaped oil seal attached to the bearing housing, and a jig power section provided so as to be capable of rotating the shaft, and orthogonal to the axial direction of the jig power section A jig fixing portion that extends in a radial direction and contacts the oil seal mounting side end surface of the bearing housing to fix the jig, and the jig using the rotational force of the jig power portion as a power source. An expanding rust portion that extends along the fixed portion and is inserted between the oil seal and the groove portion of the bearing housing.

  Further, as one aspect of the present invention, in order to solve the problem of reliably removing the oil seal while applying an even force to the entire circumference of the oil seal, the expanding rust portions are arranged at equal intervals in the circumferential direction. And three or more wedge members that slide along the jig fixing portion, and a tapered claw portion that holds the oil seal together with the jig fixing portion at the tip of each wedge material. You may have.

  Furthermore, as one aspect of the present invention, in order to solve the problem of uniformly expanding a plurality of wedge members supported in a slidable manner, the jig power unit is arranged in the jig body in the axial direction. A bolt member provided with a male screw provided, and a taper shaft provided with a taper surface that is screwed into the bolt member and screwed in the axial direction while moving each wedge member in the expanding direction; It may be.

  Further, as one aspect of the present invention, in order to solve the problem of uniformly expanding a plurality of wedge members supported in a slidable manner, the expanding wedge portion is rotated by the jig power unit. And each wedge member is supported at one end of the rotating disk on the outer peripheral edge of the rotating disk so as to be swingable, and at the other end is a long hole along the longitudinal direction. And a pin member fixed to the jig fixing portion may be inserted into the elongated hole.

  According to the present invention, it is possible to easily and safely work without damaging the bearing housing when removing the oil seal.

It is a front view which shows 1st embodiment of the oil seal removal jig | tool which concerns on this invention. It is a left view which shows the oil seal removal jig | tool of this 1st embodiment shown in FIG. It is a right view which shows the oil seal removal jig | tool of this 1st embodiment shown in FIG. It is an exploded view which shows the oil seal removal jig | tool of this 1st embodiment. It is an exploded view which shows other embodiment which formed the taper surface of the taper shaft in the rear-end side. It is a figure which shows the state before fixing the oil seal removal jig | tool of this 1st embodiment to a bearing housing. It is sectional drawing which shows the state which reduced the diameter of the wedge material in the oil seal removal jig | tool of this 1st embodiment. It is a figure which shows the state which fixed the oil seal removal jig | tool of this 1st embodiment to the bearing housing. It is sectional drawing which shows the state which expanded the wedge material in the oil seal removal jig | tool of this 1st embodiment. It is an expanded sectional view showing the state where the wedge material in this first embodiment was inserted between the oil seal and the groove part of the bearing housing. It is a figure which shows the state which removed the oil seal from the bearing housing with the oil seal removal jig | tool of this 1st embodiment. It is a front view which shows 2nd embodiment of the oil seal removal jig | tool which concerns on this invention. It is a left view which shows the oil seal removal jig | tool of this 2nd embodiment shown in FIG. It is a right view which shows the oil seal removal jig | tool of this 2nd embodiment shown in FIG. It is a figure which shows the state which the expanding rust part of this 2nd embodiment expands and shrinks. It is a figure which shows the removal method of the oil seal using the conventional driver.

  Hereinafter, a first embodiment of an oil seal removing jig according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 4, the oil seal removal jig 1 of the first embodiment is perpendicular to the axial direction of the jig power unit 2 provided so as to be capable of rotating the shaft. It has a jig fixing part 3 extending in the radial direction, and an expanding rust part 4 that expands using the rotational force of the jig power part 2 as a power source. Hereinafter, each configuration will be described in detail.

  The jig power unit 2 is provided so as to be rotatable about a shaft, and is used to obtain a rotational force that serves as a power source for expanding a rust portion that expands from a rotating tool or the like. As shown in FIG. 4, the jig power unit 2 in the first embodiment includes a jig body 21, a bolt member 22, and a taper shaft 23.

  The jig body 21 holds the taper shaft 23 so as to be slidable, and is formed in a cylindrical shape in the first embodiment. The distal end side is closed, and a bolt insertion hole 24 is formed at the center position (axial center position) for allowing the bolt member 22 to be inserted and rotatably supported. On the other hand, the rear end side is provided with a detachable lid portion 25 so that the taper shaft 23 can be inserted into the lid portion 25 by opening the lid portion 25. Further, as shown in FIGS. 4, 7, and 9, a guide protrusion 33 for preventing the taper shaft 23 from rotating is formed on the inner peripheral surface of the jig body 21.

  The bolt member 22 is a bolt for screwing the taper shaft 23, and includes a rotary head 26 that receives a rotational force from a rotary tool such as an impact wrench, socket wrench, ratchet wrench, spanner, or screwdriver, and the rotary head. 26 and a male threaded portion 27 extending from 26.

  The rotary head 26 receives a rotational force from the fitted rotary tool, and is formed in a hexagon as shown in FIG. The rotary head 26 is not limited to a hexagonal shape, and may be appropriately selected from shapes that can be engaged with various rotary tools and receive a rotational force. For example, although not shown, it may be formed in a polygonal shape such as a quadrangle or an octagon, and a recess that can be engaged with an electric screwdriver or the like may be formed on the tip surface.

  The male screw portion 27 is a long cylindrical bar extending from the rotary head 26, and has a male screw formed on the outer peripheral surface. As shown in FIG. 4, the male screw portion 27 in the first embodiment is a male screw so that the taper shaft 23 can be screwed along the axial direction from the front end side to the rear end side of the jig body 21. A male screw is formed over substantially the entire screw portion 27.

  As shown in FIGS. 1 and 4, the bolt member 22 is inserted into a bolt insertion hole 24 formed on the distal end side of the jig body 21 and is supported so as to be rotatable about the shaft.

  The taper shaft 23 converts the rotational force of the rotating bolt member 22 into a power source for expanding the expanding rust portion 4, and in the first embodiment, as shown in FIG. And a taper portion 29 extending to the tip end side of the shaft portion 28.

  The shaft portion 28 is formed to be slightly smaller in diameter than the inner diameter so that it can slide in the axial direction along the inside of the jig body 21. Further, as shown in FIGS. 4, 7 and 9, the shaft portion 28 has a guide groove 34 in the axial direction in which a guide protrusion 33 formed on the inner peripheral surface of the jig body 21 can be fitted. Are formed along. The tapered portion 29 extends to the distal end side of the shaft portion 28, and has a tapered surface formed in a tapered shape toward the distal end side. Further, at the axial center position of the taper shaft 23, as shown in FIG. 4, a female screw that can be screwed into the male screw portion 27 of the bolt member 22 to be screwed in the axial direction with respect to the bolt member 22. A hole 30 is formed. That is, the taper shaft 23 in the first embodiment is screwed from the rear end side of the jig main body 21 toward the front end side along the bolt member 22, so that the wedge material 41 to be described later extends along the taper surface. To spread outward.

  The taper portion 29 of the taper shaft 23 is not limited to the one formed with the tip side tapered, and may be formed with the rear end side tapered as shown in FIG. . In this case, the taper shaft 23 can be screwed outward from the front end side to the rear end side with respect to the bolt member 22, so that the wedge material 41 can be pushed outward along the taper surface.

  The jig fixing portion 3 is abutted against the end face 51 on the oil seal mounting side of the bearing housing 5 to fix the jig to the bearing housing 5, and is a radial direction orthogonal to the axial direction of the jig power portion 2. It is extended to. As shown in FIGS. 1 to 4, the jig fixing portion 3 in the first embodiment is composed of a prismatic rod-like member having a length capable of coming into contact with the oil seal attachment side end face 51. Further, around the shaft center, the wedge member 41 is fitted to the groove portion 52 of the bearing housing 5 to which the oil seal 6 is attached so that the oil seal 6 can be sandwiched together with the tapered claw portion 43 of the wedge member 41 described later. It has a clamping surface 31 projecting one step higher on the side. As shown in FIGS. 2 and 3, the jig fixing portion 3 in the first embodiment is composed of three rod-like members, and is arranged on the outer peripheral surface of the jig main body 21 at equal intervals (120 degree intervals). Yes.

  In addition, the number of the rod-shaped members constituting the jig fixing portion 3 is not limited to three, and may be appropriately selected from four or more. Further, the jig fixing portion 3 is not limited to a rod-shaped member, and may be appropriately selected from a disk-shaped member as shown in the second embodiment.

  The expanding rust portion 4 expands along the jig fixing portion 3 using the rotational force of the jig power portion 2 as a power source, and is inserted between the oil seal 6 and the groove portion 52 of the bearing housing 5. is there. As shown in FIGS. 2 and 3, the expanding wedge portion 4 in the first embodiment cures three or more wedge materials 41 that slide along the jig fixing portion 3 and each wedge material 41. And a guide tube portion 42 that guides along the fixture fixing portion 3.

  The wedge member 41 is made of a long prismatic bar, and has a tapered claw portion 43 that holds the oil seal 6 together with the jig fixing portion 3 at the tip. Specifically, as shown in FIGS. 1 and 4, the tapered claw portion 43 is formed in a tapered shape on the jig fixing portion 3 side, and the oil seal 6 is connected to the jig fixing portion 3 by expanding. The oil seal 6 is clamped together with the jig fixing portion 3. In addition, the base end portion of the wedge member 41 is provided with an inclined surface 44 having an angle substantially the same as the angle of the tapered surface so as to easily slide along the tapered surface of the tapered shaft 23 and not damage the tapered surface. ing.

  The guide tube portion 42 supports the wedge material 41 so as to be slidable along the jig fixing portion 3, and is formed in a cylindrical shape having an inner diameter formed slightly larger than the outer shape of the wedge material 41. ing. As shown in FIGS. 1 to 4, the guide cylinder portion 42 in the first embodiment is provided at three locations at equal intervals in the circumferential direction in accordance with the position of the rod-shaped member constituting the jig fixing portion 3. . Each guide tube portion 42 communicates with the inside of the jig body 21 so that the base end portion of the wedge member 41 can come into contact with the taper surface of the taper shaft 23.

  Further, each guide tube portion 42 has the jig fixing portion so that the tip of the tapered claw portion 43 is inserted between the oil seal 6 and the groove portion 52 of the bearing housing 5 when the wedge material 41 is expanded. 3 is formed at a position separated from the abutment surface side according to the thickness of the oil seal 6. In other words, in the first embodiment, the installation position of the wedge member 41 and the guide tube portion 42 depends on the distance from the oil seal mounting side end surface 51 of the bearing housing 5 to the contact surface 53 of the groove portion 52 and the oil seal 6. Since it is adjusted in advance, it is not necessary to perform positioning during the work.

  The number of the wedge members 41 and the guide tube portions 42 is not limited to three, and may be appropriately selected from four or more as long as the force can be uniformly applied to the entire circumference of the oil seal 6. Good.

  Next, the operation of each component in the oil seal removing jig 1 of the first embodiment will be described.

  The oil seal 6 is formed in a ring shape, and as shown in FIG. 6, the oil seal 6 is fitted into a groove portion 52 formed along the inner peripheral surface of the bearing housing 5.

  The oil seal removing jig 1 reduces the diameter of the wedge material 41 of the wedge portion that is widened by rotating the bolt member 22 of the jig power portion 2 so that the jig body 21 can be disposed on the inner peripheral portion of the bearing housing 5. To the state. At this time, the taper shaft 23 inside the jig main body 21 is arranged on the rear end side as shown in FIG. 7, and supports the base end portion of the wedge member 41 on the front end side of the taper portion 29 having a small outer diameter. ing. Therefore, the wedge material 41 can be accommodated in the guide tube portion 42 and the jig body 21 and reduced in diameter.

  Next, as shown in FIG. 8, the tips of the rod-shaped members of the jig fixing portion 3 are brought into contact with the oil seal mounting side end surface 51 of the bearing housing 5 to which the oil seal 6 is mounted. As a result, the jig fixing portion 3 is fixed to the bearing housing 5. Further, since the wedge member 41 is adjusted in advance so as to be positioned between the groove portion 52 of the bearing housing 5 and the contact surface of the oil seal 6, the jig fixing portion 3 is brought into contact with the end surface 51 on the oil seal mounting side. Positioning to expand the wedge material 41 is completed by contacting.

  In this state, although not shown, a rotary tool such as an impact wrench is fitted to the rotary head 26 of the bolt member 22 and rotated. The male screw portion 27 is rotated by the rotational force of the rotary tool received from the rotary head 26. As shown in FIG. 9, the taper shaft 23 is screwed from the rear end side to the front end side by the rotation of the male screw portion 27. At this time, since the guide protrusion 33 is fitted in the guide groove 34, the taper shaft 23 is screwed along the axial direction without rotating with the bolt member 22 in the jig body 21. Further, since the jig main body 21 is fixed to the bearing housing 5 by the jig fixing portion 3, only the bolt member 22 can be rotated without rotating around the bolt member 22.

  Further, since the taper surface gradually expands toward the rear end side, each wedge member 41 is evenly spread by the taper surface as the taper shaft 23 is screwed. Since the angle of the inclined surface 44 and the taper surface at the base end portion of the wedge member 41 is formed at substantially the same angle, the surfaces contact each other and disperse the pressure applied per unit area. Therefore, the wedge material 41 easily slides along the tapered surface of the tapered shaft 23 without damaging the tapered surface.

  Then, the guide cylinder portion 42 guides the wedge material 41 and expands it along the jig fixing portion 3. As shown in FIG. 10, the front end claw portion of each expanded wedge member 41 is inserted between the oil seal 6 and the groove portion 52 of the bearing housing 5. As described above, since the front end position of the wedge member 41 is positioned in advance between the oil seal 6 and the groove portion 52 of the bearing housing 5, the wedge member 41 can be reliably inserted therebetween. Therefore, the contact surface between the oil seal 6 and the bearing housing 5 is not damaged.

  The tapered claw portion 43 of the wedge member 41 inserted between the oil seal 6 and the groove portion 52 of the bearing housing 5 pushes the oil seal 6 toward the jig fixing portion 3 along the taper surface thereof, and the jig fixing portion. The oil seal 6 is clamped together with the three clamping surfaces 31.

  Finally, as shown in FIG. 11, a commercially available pulley remover 7, electric drill 8, and the like are used to push the oil seal removal jig 1 together from the groove 52 of the bearing housing 5 to the outside. Since the wedge members 41 in the first embodiment are arranged at equal intervals (120-degree intervals) in the circumferential direction, it is possible to apply force evenly to the entire circumference of the oil seal 6. Thereby, the oil seal 6 can be reliably removed from the bearing housing 5. Further, since the oil seal 6 is clamped by the tapered claw portion 43 of the wedge material 41 and the clamping surface 31 of the jig fixing portion 3, the oil seal 6 is removed integrally with the oil seal removal jig 1.

According to the oil seal removing jig 1 of the first embodiment as described above, the following effects can be obtained.
1. Since the direction of shaft rotation and the direction of expansion are orthogonal, a rotating tool that can be continuously rotated by an electric motor such as an impact wrench can be used, greatly reducing work time and adding too much force. It is possible to prevent the operator from being injured.
2. Since the jig fixing portion 3 is fixed in contact with the bearing housing 5, the jig main body 21 can be prevented from rotating.
3. Since the positions of the jig fixing portion 3 and the wedge material 41 are adjusted in advance according to the thickness of the oil seal 6, positioning can be performed easily, and the contact between the groove portion 52 of the bearing housing 5 and the oil seal 6 can be achieved. Does not hurt the surface.
Since the three or more wedge members 41 are arranged at equal intervals in the circumferential direction, the oil seal 6 can be reliably removed while applying a force evenly to the entire circumference of the oil seal 6.
5. By rotating the taper shaft 23 having a tapered surface, the wedge members 41 can be spread evenly by pushing and expanding along the tapered surface.

  Next, a second embodiment of the oil seal removing jig according to the present invention will be described with reference to the drawings. In addition, about the structure equivalent to or equivalent to the structure of 1st embodiment mentioned above among the oil seal removal jig | tool 1 of this 2nd embodiment, description for the second time is abbreviate | omitted.

  As shown in FIGS. 12 to 14, the jig power unit 2 includes a rotating head 26 and a rotating shaft portion 32 extending from the rotating head 26. The rotating shaft portion 32 is supported at the center position (axial center position) of the jig fixing portion 3, and a rotating disk 45 described later is fixed to the tip.

  As shown in FIGS. 12 to 14, the jig fixing portion 3 is made of a disk-like member having a radius that can contact the oil seal mounting side end surface 51. Note that the jig fixing portion 3 is not limited to a member made of a disk-like member, and may be appropriately selected from a plurality of rod-like members as shown in the first embodiment.

  The expanding wedge portion 4 includes a wedge member 41, a rotating disc 45 that supports the wedge member 41 in a swingable manner, and the wedge member 41 is contracted and expanded in the radial direction as the rotating disc 45 rotates. And a pin member 46 for opening and moving.

  The rotating disk 45 rotates with the rotation of the jig power unit 2 and has an outer diameter that is larger than the outer diameter of the rotating shaft portion 32 of the jig power unit 2 and smaller than the inner diameter of the oil seal 6. It is formed in a disc shape. The rotary disk 45 is fixed to the tip of the rotary shaft portion 32 and is rotated by a rotational force received from the rotary tool via the rotary head 26 and the rotary shaft portion 32.

  As shown in FIGS. 12 to 14, the wedge member 41 in the second embodiment has one end portion (base end portion) supported on the outer peripheral edge of the rotating disk 45 so as to be swingable. A long hole 47 is formed in the other end portion (tip portion) of the wedge member 41 along the longitudinal direction.

  The pin member 46 is for sliding the wedge member 41 along the long hole 47, and is inserted through the long hole 47. As shown in FIGS. 12 to 14, the pin member 46 in the second embodiment has a pedestal portion 48 fixed to the jig fixing portion 3 and a pin portion 49 fixed to the pedestal portion 48. ing.

  As shown in FIG. 12, the pedestal portion 48 is fixed to the jig fixing portion 3 and supports the pin portion 49. The pedestal portion 48 has a thickness larger than the outer diameter of the pin portion 49 and about the same thickness as the rotating disk 45 so that the wedge member 41 can slide in parallel with the jig fixing portion 3.

  The pin portion 49 has an outer diameter that can be inserted into a long hole 47 formed in the wedge member 41, and is erected on the end surface of the pedestal portion 48. Further, the head portion of the pin portion 49 is formed to have a diameter larger than the width of the long hole 47 so that the long hole 47 of the wedge material 41 does not fall out of the pin material 46.

  Next, the operation of each component in the oil seal removing jig 1 of the second embodiment will be described.

  The wedge member 41 of the wedge part that is expanded by rotating the rotary head 26 of the jig power unit 2 is reduced to the center side so that the wedge member 41 can be arranged on the inner peripheral part of the bearing housing 5. In the second embodiment, the rotating disk 45 is rotated clockwise in FIG. 15 in accordance with the rotation operation of the jig power unit 2. The wedge member 41 rotates with the position of one end (base end) as the rotating disk 45 rotates. On the other hand, since the pin member 46 is inserted into the long hole 47, the wedge member 41 can move only in the direction along the long hole 47. Therefore, when the position of one end of the wedge member 41 rotates, the wedge member 41 swings so as to be bent with respect to the rotating disk 45 as shown in FIG. Further, the front end of each wedge member 41 is uniformly reduced in diameter as it is bent with respect to the rotating disk 45. Since the rotation is prevented by the pin member 46 coming into contact with the distal end side of the long hole 47, it is not rotated more than necessary.

  In this state, the wedge member 41 is disposed on the inner peripheral portion of the bearing housing 5, and the jig fixing portion 3 is brought into contact with the oil seal mounting side end surface 51 of the bearing housing 5. The jig fixing portion 3 is fixed to the bearing housing 5 and positioning for expanding the wedge material 41 is completed.

  Although not shown, a rotary tool such as an impact wrench is fitted to the rotary head 26 and rotated in the opposite direction (counterclockwise in FIG. 15) when the diameter is reduced. The rotational force of the rotary tool received by the rotary head 26 is transmitted to the rotary disc 45 through the rotary shaft portion. The wedge member 41 rotates with the position of one end (base end) as the rotating disk 45 rotates. The wedge material 41 that has been bent with respect to the rotating disk 45 has a bent angle that approaches 180 degrees. The front end of each wedge member 41 expands evenly as the angle of bending approaches 180 degrees. When the angle is 180 degrees, the longitudinal direction of the long hole 47 of the wedge member 41 and the center of the rotation shaft portion of the jig power unit 2 are aligned on a straight line, and are in a state of being most expanded in the radial direction.

  The expanded front end claw portion of each wedge member 41 is inserted between the oil seal 6 and the groove portion 52 of the bearing housing 5. The tapered claw portion 43 of the wedge member 41 inserted between the oil seal 6 and the groove portion 52 of the bearing housing 5 is fixed to the oil seal 6 along the tapered surface with a jig as in the first embodiment. The oil seal 6 is clamped together with the clamping surface 31 of the jig fixing part 3 by pushing forward to the part 3 side.

  Finally, using a commercially available pulley remover 7 and the like, the oil seal removing jig 1 is pushed out from the groove 52 of the bearing housing 5 to the outside. The wedge members 41 arranged at equal intervals in the circumferential direction apply a force evenly to the entire circumference of the oil seal 6. Therefore, the oil seal removing jig 1 of the second embodiment can reliably remove the oil seal 6 from the bearing housing 5.

  According to the oil seal removing jig 1 of the second embodiment as described above, the same effects as those of the oil seal removing jig 1 of the first embodiment can be obtained. Further, in the oil seal removing jig 1 of the second embodiment, the jig power unit 2 (rotating head 26) is arranged to directly expand the wedge material 41 outward along the long hole 47. Each wedge material 41 can be spread evenly by a slight rotation. Therefore, the working time can be shortened.

  The oil seal removal jig according to the present invention is not limited to the above-described embodiments, and can be changed as appropriate. For example, the distance between the contact surface of the jig fixing portion 3 and the wedge member 41 can be adjusted by a bolt or the like, so that the oil seal 6 having various thicknesses can be supported. Further, the wedge member 41 may be prevented from falling off the guide tube portion 42 by providing a bias member that exerts an urging force in the direction of reducing the diameter of the wedge member 41.

  In the first embodiment, the bolt insertion hole 24 is provided on the distal end side and the rotary head 26 is disposed on the distal end side. However, the bolt insertion hole 24 is provided on the rear end side of the jig body 21. It may be arranged on the rear end side. Similarly, in the second embodiment, the rotary head 26 is disposed on the rear end side, but may be disposed on the front end side.

  Further, when removing the oil seal 6 together with the oil seal removal jig 1 from the bearing housing 5, the method is not limited to the method using the pulley removal 7, and is appropriately selected from, for example, a method of pushing by hand or hitting with a hammer. May be.

DESCRIPTION OF SYMBOLS 1 Oil seal removal jig 2 Jig power part 3 Jig fixing part 4 Expanding rust part 5 Bearing housing 6 Oil seal 7 Pull pulley removal 8 Electric drill 21 Jig body 22 Bolt member 23 Taper shaft 24 Bolt insertion hole 25 Lid part DESCRIPTION OF SYMBOLS 26 Rotating head 27 Male thread part 28 Shaft part 29 Tapered part 30 Female screw hole 31 Holding surface 32 Rotating shaft part 33 Guide protrusion 34 Guide groove 41 Wedge material 42 Guide cylinder part 43 Tapered claw part 44 Inclined surface 45 Rotating disk 46 Pin material 47 Long hole 48 Pedestal part 49 Pin part 51 Oil seal mounting side end face 52 Groove part 53 Contact surface

Claims (4)

An oil seal removal jig for removing the ring-shaped oil seal attached to the bearing housing,
A jig power unit provided so that the shaft can rotate,
A jig fixing portion that extends in a radial direction perpendicular to the axial direction of the jig power section and fixes the jig in contact with the oil seal mounting side end surface of the bearing housing;
The oil has a rust portion that expands along the jig fixing portion with the rotational force of the jig power portion as a power source and is inserted between the oil seal and the groove portion of the bearing housing. Seal removal jig.   The expanding wedge portions are arranged at equal intervals in the circumferential direction, and have three or more wedge materials that slide along the jig fixing portion. The oil seal removing jig according to claim 1, further comprising a tapered claw portion that sandwiches the oil seal together with a fixture fixing portion.   The jig power unit expands each wedge member while screwing the bolt member in which a male screw provided in the axial direction is formed in the jig body and screwing the bolt member in the axial direction. The oil seal removing jig according to claim 2, further comprising: a tapered shaft having a tapered surface that moves in a direction.   The expanding wedge part has a rotating disk that rotates in accordance with the rotating operation of the jig power part, and each wedge material is swingable at one end thereof on the outer peripheral edge of the rotating disk. The pin member fixed to the jig fixing portion is inserted into the long hole and a long hole is formed in the other end portion along the longitudinal direction. Oil seal removal jig.

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