Jig

Abstract

Provided is a jig capable of restricting inclination of a seal ring.　A jig 10 for attaching a seal ring 5 to an inner peripheral surface of a housing 2 via an elastic seal member 7 by axially pressing the elastic seal member 7 externally fitted to the seal ring 5, the jig 10 comprising: a pressing portion 11 which is disposed on an outer diameter side of the seal ring 5 and capable of pressing the elastic seal member 7; and a restriction portion 12 which is positioned closer to an inner diameter side than the pressing portion 11 and capable of abutting on the seal ring 5.

Description

jig

[0001] The present invention relates to a jig for mounting a seal ring on an inner peripheral surface of a housing.

[0002] Floating seal devices are known that seal the space between a fixed structure and a rotating structure when connecting a rotating structure such as a travel motor, roller, idler, axle, etc. This type of floating seal device has seal rings attached to the housing of the fixed structure and the housing of the rotating structure via O-rings, and the pair of seal rings slide relative to each other to seal against the sealed fluid.

[0003] In such floating seal devices, a jig such as that shown in Patent Document 1 is used when attaching a seal ring to a housing. The jig shown in Patent Document 1 involves inserting an O-ring onto the outer peripheral surface of the seal ring, and pressing the O-ring toward the housing with the O-ring abutting against the edge of the inner peripheral surface of the housing, causing the seal ring and the O-ring to move toward the inner peripheral surface of the housing. This allows the seal ring to be attached to the inner peripheral surface of the housing via the O-ring.

[0004] Japanese Patent Application Laid-Open No. 11-51199 (page 4, Figure 2)

[0005] However, with a jig such as that described in Patent Document 1, when the O-ring is pressed toward the housing, the O-ring may be locally deformed, causing the seal ring to be attached to the inner surface of the housing in an inclined state, which could result in poor sliding between the sliding surfaces of the pair of seal rings.

[0006] The present invention has been made in view of the above-mentioned problems, and has as its object to provide a jig capable of restricting the inclination of the seal ring.

[0007] In order to solve the above problem, the jig of the present invention is a jig that axially presses an elastic seal member fitted around a seal ring to attach the seal ring to the inner peripheral surface of a housing via the elastic seal member, and includes a pressing portion that is arranged on the outer diameter side of the seal ring and is capable of pressing the elastic seal member, and a restricting portion that is arranged on the inner diameter side of the pressing portion and is capable of abutting against the seal ring. With this, when the elastic seal member is pressed toward the housing by the pressing portion, the restricting portion can restrict the inclination of the seal ring, so that the seal ring can be attached without being significantly inclined relative to the housing.

[0008] The restricting portion may have an annular surface perpendicular to the pressing direction, whereby tilting of the seal ring can be restricted regardless of the tilting direction.

[0009] The restricting portion may be at least partially spaced from the seal ring, thereby minimizing the effect of contact between the seal ring and the restricting portion when the elastic seal member is pressed toward the housing by the pressing portion.

[0010] The seal ring may have a sliding surface on the axially opposite side of the housing, and the restricting portion may be disposed opposite the sliding surface. With this, after the seal ring is attached to the inner peripheral surface of the housing, the jig can be pulled out in the direction away from the housing without the restricting portion interfering with the seal ring, thereby simplifying the seal ring attachment work.

[0011] The restricting portion may be made of a material having a lower rigidity than the seal ring, thereby preventing the sliding surface from coming into contact with the restricting portion and being damaged.

[0012] The jig may include an insertion depth determining portion that determines the insertion depth into the housing. In this case, the insertion depth of the jig into the housing is determined by the insertion depth determining portion, so that the seal ring can be accurately attached to the housing.

[0013] The insertion depth determining portion may be an opposing surface that abuts against the axial end face of the housing, and the pressing portion may extend from an inner diameter side of the opposing surface toward the housing. In this way, when the opposing surface of the jig abuts against the end face of the housing, the pressing portion is inserted deep into the housing, allowing the elastic seal member and the seal ring to be inserted deep into the housing.

[0014] The jig may include an insert having the pressing portion and the restricting portion, and an annular guide disposed between the insert and the housing and into which the pressing portion can be inserted, the guide having a tapered surface that reduces in diameter toward the housing. In this case, the tapered surface guides the elastic seal member so that its diameter reduces toward the housing, allowing the seal ring to be accurately attached to the housing.

[0015] The restricting portion may have an inner edge formed into a smoothly curved surface. With this, the inclined inner edge of the restricting portion comes into contact with the seal ring, thereby preventing damage to the seal ring.

[0016] The tip of the pressing portion may be formed into a smoothly curved surface, which can prevent the elastic seal member from being damaged by the pressure of the pressing portion.

[0017] FIG. 1 is a cross-sectional view showing a floating seal device in Example 1 of the present invention. FIG. 1 is a schematic cross-sectional view showing a state before a seal ring is attached to a housing using a jig. FIG. 1 is a schematic cross-sectional view showing a state after the seal ring has been attached to a housing using a jig. FIG. 1 is a schematic cross-sectional view showing a state in which the seal ring is tilted when attaching the seal ring to the housing using a jig. FIG. 1 is a schematic cross-sectional view showing a state in which a pair of seal rings attached to a housing are being assembled. FIG. 2 is a schematic cross-sectional view showing a state before a seal ring is attached to a housing using a jig in Example 2 of the present invention. FIG. 2 is a schematic cross-sectional view showing a state after the seal ring has been attached to a housing using a jig in Example 2. FIG. 3 is a schematic cross-sectional view showing a state before a seal ring is attached to a housing using a jig in Example 3 of the present invention. FIG. 3 is a schematic cross-sectional view showing a state after the seal ring has been attached to a housing using a jig in Example 3. FIG. 4 is a schematic cross-sectional view showing a state in which the seal ring is tilted when attaching the seal ring to a housing using a jig in Example 3 of the present invention.

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mode for carrying out a jig according to the present invention will be described below based on an embodiment.

[0019] A jig according to a first embodiment will be described with reference to Fig. 1 to Fig. 5. In the following description, the upper side of the paper in Fig. 2 is the upper side of the jig.

[0020] The floating seal device 1 of this embodiment 1 has a track roller 3 serving as a rotating side housing rotatably connected to a rotating shaft 9 (see Figure 1) extending from a side frame supporting an endless track, and is used to prevent foreign matter such as soil and mud from entering the rotating shaft 9 side through the gap between the fixed side housing 2 and the track roller 3.

[0021] As shown in Figure 1, the floating seal device 1 is mainly composed of a fixed side housing 2, a track roller 3, a fixed side seal ring 5, a rotating side seal ring 6, a fixed side O-ring 7 as a fixed side elastic seal member, and a rotating side O-ring 8 as a rotating side elastic seal member.

[0022] The fixed side housing 2 is fixed to a side frame (not shown). The track roller 3 is connected to a rotating shaft 9 with the rotating shaft 9 inserted therethrough. The fixed side seal ring 5 is disposed on the inner diameter side of the fixed side housing 2. The rotating side seal ring 6 is disposed on the inner diameter side of the track roller 3. The fixed side O-ring 7 is interposed between the fixed side housing 2 and the fixed side seal ring 5. The rotating side O-ring 8 is interposed between the track roller 3 and the rotating side seal ring 6.

[0023] The track roller 3 is arranged axially spaced apart from the fixed housing 2 and is rotatable relative to the fixed housing 2 .

[0024] The seal rings 5, 6 and the O-rings 7, 8 separate an outer space S1 including the gap between the fixed housing 2 and the track roller 3 from an inner space S2 on the rotating shaft 9 side, and seal the boundary between them. The fixed housing 2, track roller 3, seal rings 5, 6 and O-rings 7, 8 will be described in detail below.

[0025] First, the fixed housing 2 will be described. Referring to Figure 1, the fixed housing 2 is formed in a stepped cylindrical shape into which the rotary shaft 9 can be loosely inserted. The fixed housing 2 has an inner peripheral portion 2A, which is recessed in the axial direction and opens toward the track roller 3, on the inner diameter side facing the track roller 3. The inner peripheral portion 2A is formed with a sealing surface 20 whose diameter decreases toward the inner diameter as it moves away from the opposing track roller 3 in the axial direction. The fixed housing 2 also has a return portion 2B that prevents the fixed O-ring 7 from slipping out of the inner peripheral portion 2A toward the track roller 3.

[0026] Next, the track roller 3 will be described. The track roller 3 is formed in a stepped cylindrical shape that can be fitted onto the rotating shaft 9. The track roller 3 has an inner peripheral portion 3A that is open toward the fixed housing 2 and recessed in the axial direction on the inner diameter side facing the fixed housing 2. The inner peripheral portion 3A is formed with a sealing surface 30 whose diameter decreases toward the inner diameter as it moves away from the opposing fixed housing 2 in the axial direction. The track roller 3 also has a return portion 3B that prevents the rotating side O-ring 8 from slipping out toward the track roller 3 at the inner peripheral portion 3A.

[0027] Next, we will explain the stationary seal ring 5. The stationary seal ring 5 is made of cast iron and is formed in a stepped cylindrical shape into which the rotating shaft 9 can be loosely inserted. The stationary seal ring 5 has an annular sliding surface 50 at the end opposite the rotating seal ring 6.

[0028] The stationary seal ring 5 has an annular inclined groove 5a recessed toward the inner diameter side at the axial center of the outer diameter side. The bottom surface of the inclined groove 5a forms a tapered surface 51 whose diameter decreases as it moves away from the sliding surface 50.

[0029] In manufacturing the stationary seal ring 5, Cr--Mo cast iron and Ni--Cr cast iron are preferred materials, but other materials such as copper alloy, carbon steel, SiC, cemented carbide, and ceramics may also be used.

[0030] Next, the rotating-side seal ring 6 will be described. The rotating-side seal ring 6 is made of cast iron and is formed in a stepped cylindrical shape that allows the rotating shaft 9 to be loosely inserted. The rotating-side seal ring 6 has an annular sliding surface 60 at the end facing the fixed-side seal ring 5.

[0031] The rotary seal ring 6 has an annular inclined groove 6a recessed toward the inner diameter side at the axial center of the outer diameter side. The bottom surface of the inclined groove 6a forms a tapered surface 61 whose diameter decreases as it moves away from the sliding surface 60.

[0032] In manufacturing the rotary seal ring 6, Cr--Mo cast iron and Ni--Cr cast iron are preferred materials, but other materials such as copper alloy, carbon steel, SiC, cemented carbide, and ceramics may also be used.

[0033] Next, we will explain the fixed-side O-ring 7 and the rotating-side O-ring 8. The fixed-side O-ring 7 and the rotating-side O-ring 8 are made of rubber and are formed into an annular shape that can be fitted onto the inclined grooves 5a, 6a of the fixed-side seal ring 5 and the rotating-side seal ring 6.

[0034] The fixed side O-ring 7 and the rotating side O-ring 8 are sandwiched in a compressed state between the fixed side housing 2 and the fixed side seal ring 5, and between the track roller 3 and the rotating side seal ring 6. The elastic restoring forces of the fixed side O-ring 7 and the rotating side O-ring 8 act in a direction that brings the fixed side seal ring 5 and the rotating side seal ring 6 closer to each other.

[0035] As a result, a predetermined sliding surface pressure is applied between the sliding surfaces 50, 60 in the axial direction, and the sliding surfaces 50, 60 function as a primary seal.

[0036] In addition, the fixed side O-ring 7, which is in close contact between the fixed side housing 2 and the fixed side seal ring 5, and the rotating side O-ring 8, which is in close contact between the track roller 3 and the rotating side seal ring 6, function as secondary seals.

[0037] In this way, it is possible to reliably prevent foreign matter such as earth and mud from entering the interior space S2, which contains lubricating oil as a fluid, from the exterior space S1. Note that the fluid may be something other than lubricating oil.

[0038] The fixed side O-ring 7 and the rotating side O-ring 8 are preferably made of materials such as hydrogenated nitrile rubber (H-NBR), perfluoroelastomer, nitrile rubber (NBR) with a hardness of Duro A 60 to 70, urethane rubber (U), fluororubber (FKM), butyl rubber (IIR), and elastic resins.

[0039] Next, we will explain the procedure for attaching the stationary seal ring 5 and the stationary O-ring 7 to the stationary housing 2. Note that the attachment of the rotating seal ring 6 and the rotating O-ring 8 to the track roller 3 is almost the same as the attachment of the stationary seal ring 5 and the stationary O-ring 7 to the stationary housing 2, so the explanation will be omitted.

[0040] 2, first, the fixed housing 2 is positioned horizontally with the end face 2a facing upward. Then, the fixed seal ring 5 with the fixed O-ring 7 fitted into the inclined groove 5a is positioned above the fixed housing 2. At this time, the fixed O-ring 7 is locked onto the return portion 2B.

[0041] Next, the jig 10 is set above the fixed side O-ring 7 and the fixed side seal ring 5. The jig 10 is made of synthetic resin and is formed in a stepped cylindrical shape.

[0042] Specifically, it has an axial portion 11 as a pressing portion that is cylindrical and extends in the axial direction, and a radial portion 12 as a regulating portion that extends in an annular shape inward from the upper end side of the axial portion 11.

[0043] At the boundary between the axial portion 11 and the radial portion 12, a step 10A is formed by the inner circumferential surface 11a of the axial portion 11 and the end face 12a of the radial portion 12. The inner circumferential surface 11a of the axial portion 11 has a larger diameter than the stationary seal ring 5. The inner circumferential surface 12b of the radial portion 12 has a smaller diameter than the stationary seal ring 5. The end face 12a of the radial portion 12 is a flat annular surface perpendicular to the pressing direction.

[0044] The lower end of the axial portion 11, i.e., the inner diameter edge 11b of the tip portion, is chamfered to form a smoothly curved surface.

[0045] The jig 10 is fitted onto the stationary seal ring 5 from above so that the stationary seal ring 5 is positioned on the step 10A. When the jig 10 is set above the stationary O-ring 7 and the stationary seal ring 5, the inner diameter edge 11b of the axial portion 11 abuts against the stationary O-ring 7, and the sliding surface 50 of the stationary seal ring 5 and the end face 12a of the radial portion 12 opposing the sliding surface 50 are spaced apart vertically.

[0046] 3, a force is applied from above the jig 10 to press the stationary O-ring 7 with the inner diameter edge 11b of the axial portion 11. As a result, the stationary seal ring 5 moves downward together with the stationary O-ring 7.

[0047] The pressing operation of the fixed side O-ring 7 and the fixed side seal ring 5 by the jig 10 is performed until the end face 11c of the axial portion 11 abuts against the end face 2a of the fixed side housing 2. When the end face 11c of the axial portion 11 abuts against the end face 2a of the fixed side housing 2, the fixed side O-ring 7 is positioned and sized to be inserted to an appropriate depth into the fixed side housing 2. In other words, the end face 11c of the axial portion 11 functions as an insertion depth determining portion.

[0048] When the jig 10 presses the fixed side O-ring 7 and the fixed side seal ring 5, as shown in Figure 3, if the fixed side seal ring 5 is not inclined, the sliding surface 50 of the fixed side seal ring 5 and the end face 12a of the radial portion 12 do not come into contact with each other but are spaced apart, so that the force in the pressing direction is not hindered by contact between the sliding surface 50 and the end face 12a.

[0049] Furthermore, since the inner diameter edge 11b of the jig 10 abuts on the outer diameter side of the center of the cut surface of the fixed side O-ring 7, the fixed side O-ring 7 receives a force from the jig 10 downward and toward the inner diameter side, making it easier for the fixed side O-ring 7 to get in between the seal surface 20 and the tapered surface 51. Note that the jig 10 may also abut on the center or inner diameter side of the cut surface of the fixed side O-ring 7.

[0050] When the jig 10 is used to press the fixed-side O-ring 7 and the fixed-side seal ring 5, it may not be possible to apply a uniform force in the circumferential direction to the fixed-side O-ring 7. For example, as shown in Fig. 4, a localized portion of the fixed-side O-ring 7 (e.g., the portion on the left side of the drawing) may get caught on the return portion 2B of the fixed-side housing 2 and undergo significant compressive deformation without moving downward compared to other portions in the circumferential direction, causing other portions of the fixed-side O-ring 7 in the circumferential direction (e.g., the portion on the right side of the drawing) to move downward.

[0051] In such a case, the fixed side seal ring 5 tilts relative to the jig 10 along with the fixed side O-ring 7, but since a portion of the sliding surface 50 of the fixed side seal ring 5 abuts against the end face 12a of the radial portion 12, the fixed side seal ring 5 is prevented from tilting too much.

[0052] In this way, the fixed side O-ring 7 and the fixed side seal ring 5 move downward while the inclination of the fixed side seal ring 5 is restricted, thereby preventing the fixed side seal ring 5 from being attached at a large inclination relative to the fixed side housing 2.

[0053] Furthermore, even if a portion of the sliding surface 50 of the fixed side seal ring 5 abuts against the end face 12a of the radial portion 12, the portion other than the abutting point is spaced apart from the end face 12a, thereby reducing the effect of the force in the pressing direction.

[0054] Furthermore, since the end face 12a of the radial portion 12 is formed in an annular shape, the inclination of the stationary seal ring 5 can be restricted in any direction.

[0055] Furthermore, since the jig 10 is annular, the pressing depth of the stationary seal ring 5 can be visually confirmed through the through hole of the jig 10 during the pressing operation.

[0056] Also, returning to Figure 3, the end face 11c of the axial portion 11 abuts against the end face 2a of the fixed side housing 2 in the circumferential direction, thereby determining the insertion depth of the fixed side seal ring 5 into the fixed side housing 2, and allowing the fixed side seal ring 5 to be accurately attached to the fixed side housing 2.

[0057] Furthermore, even if the fixed side seal ring 5 is inclined before the end face 11c of the axial portion 11 abuts against the end face 2a of the fixed side housing 2, the abutment between the end face 11c of the axial portion 11 and the end face 2a of the fixed side housing 2 corrects the inclination of the fixed side seal ring 5 to the appropriate angle.

[0058] Furthermore, after the end face 11c of the axial portion 11 abuts against the end face 2a of the fixed side housing 2, i.e., after the pressing operation of the fixed side O-ring 7 and the fixed side seal ring 5 by the jig 10 is completed, the jig 10 can be moved in the axially opposite direction from the fixed side housing 2, so that the jig 10 can be pulled out without interfering with the fixed side seal ring 5.

[0059] 5, the rotating-side seal ring 6 and rotating-side O-ring 8 are attached to the track roller 3 using a jig 10 in the same manner as above, and then the fixed-side housing 2 and track roller 3 are inserted onto the rotating shaft 9. Then, the sliding surface 50 of the fixed-side seal ring 5 and the sliding surface 60 of the rotating-side seal ring 6 are adjusted to have an appropriate surface pressure, and the track roller 3 is fixed to the rotating shaft 9, completing the assembly of the floating seal device 1 (see FIG. 1).

[0060] Since the jig 10 is made of a synthetic resin that is less rigid than the fixed side seal ring 5, even if the fixed side seal ring 5 is inclined and the sliding surface 50 abuts against the end face 12a of the radial portion 12, damage to the sliding surface 50 can be prevented.

[0061] The jig 10 may be made of a metal such as aluminum, and can be freely changed, as long as the material has lower rigidity than the fixed seal ring 5. Furthermore, the entire jig 10 does not need to be made of a material with lower rigidity than the fixed seal ring 5, as long as the end surface 12a of the radial portion 12 is made of a material with lower rigidity.

[0062] In addition, since the fixed side seal ring 5 is positioned inside the axial portion 11 of the jig 10, when the fixed side seal ring 5 tilts, it abuts against the inner surface 11a of the axial portion 11, thereby regulating the tilt.

[0063] In addition, the inner diameter edge 11b of the axial portion 11 that presses the fixed side O-ring 7 is chamfered to form a smoothly curved surface, which makes it possible to avoid damaging the fixed side O-ring 7 when pressing.

[0064] Furthermore, since the axial portion 11 and the radial portion 12 are made up of a single member, the relative positions of the axial portion 11 and the radial portion 12 do not shift, and the inclination of the fixed side seal ring 5 can be reliably restricted.

[0065] In this embodiment, the fixed seal ring 5 is inclined relative to the jig 10 and the fixed housing 2, but the jig 10 may be inclined relative to the fixed seal ring 5, causing the fixed seal ring 5 to be inclined relative to the fixed housing 2. Even in such a case, the end surface 12a of the radial portion 12 restricts the relative inclination between the fixed seal ring 5 and the jig 10.

[0066] Furthermore, in this embodiment, an example is given in which the axial portion 11 is annular, but this is not limited to this, and for example, multiple axial portions may be provided spaced apart circumferentially around the annular radial portion 12.

[0067] In addition, in this embodiment, the radial portion 12 is annular, but the present invention is not limited to this and may be, for example, disc-shaped. Furthermore, a plurality of radial portions 12 may be provided spaced apart in the circumferential direction.

[0068] Next, a jig according to a second embodiment will be described with reference to Figures 6 and 7. Note that a description of the same configuration as in the first embodiment will be omitted.

[0069] As shown in FIG. 6, the jig 310 of the second embodiment has an axial portion 311, a radial portion 312, and an inner diameter side step portion 310A.

[0070] The axial portion 311 has a cylindrical shape and extends in the axial direction, and an end face 311c thereof faces the end face 302a of the fixed housing 302. The inner peripheral surface 311a of the axial portion 311 has a smaller diameter than the inner peripheral edge of the end face 302a of the fixed housing 302. In other words, the inner peripheral surface 311a of the axial portion 311 is positioned radially inward relative to the inner peripheral edge of the end face 302a of the fixed housing 302.

[0071] An annular protrusion 311d serving as a pressing portion is provided on the inner peripheral side below the axial portion 311, extending downward from the end face 311c. The inner peripheral surface of the annular protrusion 311d is flush with the inner peripheral surface 311a of the axial portion 311, the outer peripheral surface has a smaller diameter than the inner peripheral edge of the end face 302a of the fixed-side housing 302, and the lower surface is curved.

[0072] The inner diameter side step portion 310A is constituted by an inner peripheral surface 311 a of the axial portion 311 and an end surface 312 a of the radial portion 312 .

[0073] Next, a procedure for attaching the stationary side seal ring 305 and the stationary side O-ring 307 to the stationary side housing 302 will be described.

[0074] 6, the fixed-side seal ring 305 fitted with the fixed-side O-ring 307 is placed above the fixed-side housing 302. The fixed-side O-ring 307 is held on the inner peripheral edge of the end face 302a of the fixed-side housing 302.

[0075] Next, the jig 310 is fitted from above to set the stationary seal ring 305 so that it is positioned on the inner diameter side step 310A. When the jig 310 is set above the stationary O-ring 307 and the stationary seal ring 305, the annular protrusion 311d of the axial portion 311 abuts against the stationary O-ring 307, and the sliding surface 350 of the stationary seal ring 305 and the end face 312a of the radial portion 312 that faces the sliding surface 350 are spaced apart vertically.

[0076] 7, a force is applied from above the jig 310, and the fixed-side O-ring 307 is pressed by the annular protrusion 311d of the axial portion 311. As a result, the fixed-side seal ring 305 moves downward together with the fixed-side O-ring 307.

[0077] The pressing operation of the fixed-side O-ring 307 and the fixed-side seal ring 305 by the jig 310 is performed until the end face 311c of the axial portion 311 abuts against the end face 302a of the fixed-side housing 302. When the end face 311c of the axial portion 311 abuts against the end face 302a of the fixed-side housing 302, the annular protrusion 311d of the axial portion 311 is inserted below the end face 302a of the fixed-side housing 302, i.e., inside the fixed-side housing 302.

[0078] As a result, the fixed-side O-ring 307 is positioned at an appropriate insertion depth that passes below the return portion 302B of the fixed-side housing 302. In other words, the end face 311c of the axial portion 311 functions as an insertion depth determining portion. In this way, the jig 310 of the second embodiment can insert the fixed-side seal ring 305 and the fixed-side O-ring 307 to an appropriate deep position that passes below the return portion 302B of the fixed-side housing 302, so that the fixed-side O-ring 307 can be pressed against the inner surfaces of the fixed-side seal ring 305 and the fixed-side housing 302 with an appropriate surface pressure.

[0079] Furthermore, since the radial width of the annular protrusion 311d in cross section is shorter than the radial width of the fixed-side O-ring 307, i.e., the diameter of the cross section of the fixed-side O-ring 307, the annular protrusion 311d elastically deforms the fixed-side O-ring 307 and bites into the fixed-side O-ring 307 during the pressing operation of the jig 310. This allows the fixed-side O-ring 307 to have a large elastic restoring force, making the fixed-side seal ring 305 less likely to tilt during the pressing operation of the jig 310. If the fixed-side seal ring 305 tilts during the pressing operation of the jig 310, the end face 312a of the radial portion 312 prevents the fixed-side seal ring 305 from tilting too much, and the elastic restoring force of the fixed-side O-ring 307 immediately corrects the tilt.

[0080] In this second embodiment, the inner and outer peripheral surfaces of the annular convex portion 311d extend along the axial direction, but this is not limited to this, and one or both of the inner and outer peripheral surfaces of the annular convex portion may be tapered surfaces that are inclined to match the shape of the return portion or inner peripheral surface of the housing.

[0081] Furthermore, in this Example 2, an example was given in which the pressing portion is an annular convex portion 311d, but it is not limited to being annular, and one or more pressing portions extending inside the housing may be provided in the circumferential direction.

[0082] The axial length of the pressing portion extending inside the housing may be freely changed, but is preferably equal to or greater than the axial length of the inner peripheral surface of the return portion of the housing. If the pressing portion has an axial length equal to or greater than the axial length of the inner peripheral surface of the return portion of the housing, the elastic ring can be reliably inserted up to a position beyond the return portion in the axial direction.

[0083] Next, a jig according to a third embodiment will be described with reference to Figures 8 and 9. Note that a description of the same configuration as in the first embodiment will be omitted.

[0084] As shown in FIG. 8 , the jig 210 of the third embodiment includes an insert body 213 and a guide body 214 .

[0085] The insert 213 has an axial portion 211 , a radial portion 212 , an inner diameter side step 210A, an outer diameter side step 210B, and a flange portion 215 .

[0086] The axial portion 211 has a cylindrical shape and extends in the axial direction, and its end face 211c is chamfered to form a smoothly curved surface. The outer peripheral surface 211d of the axial portion 211 is tapered, with the diameter decreasing from above toward the end face 211c.

[0087] The inner diameter side step portion 210A is constituted by an inner peripheral surface 211 a of the axial portion 211 and an end surface 212 a of the radial portion 212 .

[0088] The outer diameter side step portion 210B is composed of an outer peripheral surface 211d of the axial portion 211 and an end surface 211e extending radially outward from the upper edge of the outer peripheral surface 211d.

[0089] The flange portion 215 is formed to protrude radially outward from the upper end of the insert 213. The flange portion 215 is used as a handle that an operator can grasp when carrying or adjusting the position of the insert 213.

[0090] The guide body 214 is a ring-shaped body made of synthetic resin, and mainly includes an axial portion 214 a, a radial portion 214 b, a step portion 214 c, and a flange portion 214 d. The guide body 214 may be made of metal such as cast iron or aluminum.

[0091] The axial portion 214 a is annular and has a larger diameter than the fixed housing 202 .

[0092] The radial portion 214b is annular and has a smaller diameter than the fixed housing 202. An inner peripheral surface 214g of the radial portion 214b is a tapered surface whose diameter decreases downward, i.e., toward the fixed housing 202.

[0093] The inner peripheral surface 214g is generally parallel to the outer peripheral surface 211d of the axial portion 211 of the insert 213. The inner diameter lower edge of the inner peripheral surface 214g has a diameter generally equal to the inner diameter of the return portion 202B of the fixed-side housing 202.

[0094] The step portion 214c is composed of an inner peripheral surface 214e of the axial portion 214a and an end surface 214f ​​of the radial portion 214b.

[0095] The flange portion 214d is formed to protrude radially outward from the upper end of the guide body 214. The flange portion 214d is used as a handle that an operator can grasp when carrying the guide body 214 or adjusting its position.

[0096] Next, a procedure for attaching the stationary side seal ring 205 and the stationary side O-ring 207 to the stationary side housing 202 will be described.

[0097] First, the guide body 214 is placed on the fixed-side housing 202. At this time, the inner peripheral surface 214e of the axial portion 214a is placed on the outer diameter side of the outer peripheral surface of the fixed-side housing 202, and the end surface 214f ​​of the radial portion 214b is placed on the end surface 202a of the fixed-side housing 202. In other words, the guide body 214 is fitted onto the fixed-side housing 202 by utilizing the step portion 214c. Therefore, the guide body 214 is restricted from moving horizontally relative to the fixed-side housing 202.

[0098] Next, the stationary seal ring 205 with the stationary O-ring 207 fitted thereon is placed above the guide body 214. The stationary O-ring 207 is held by the inner peripheral surface 214g of the guide body 214.

[0099] 8, the insert 213 is fitted from above so that the stationary seal ring 205 is positioned on the inner diameter step 210A. When the insert 213 is set above the stationary O-ring 207 and the stationary seal ring 205, the end face 211c of the axial portion 211 abuts against the stationary O-ring 207, and the sliding surface 250 of the stationary seal ring 205 and the end face 212a of the radial portion 212 opposed to the sliding surface 250 are spaced apart vertically.

[0100] 9, a force is applied from above the insert 213, and the end face 211c of the axial portion 211 presses the stationary O-ring 207. As a result, the stationary seal ring 205 moves downward together with the stationary O-ring 207.

[0101] The insert 213 continues to press the fixed-side O-ring 207 and the fixed-side seal ring 205 until the end face 211e of the insert 213 abuts against the end face 214h of the guide body 214. When the end face 211e of the insert 213 abuts against the end face 214h of the guide body 214, the fixed-side O-ring 207 is positioned so as to be at an appropriate insertion depth relative to the fixed-side housing 202. In other words, the end face 211e of the insert 213 and the end face 214h of the guide body 214 function as insertion depth determining portions.

[0102] In this way, when the insert 213 presses the fixed side O-ring 207 and the fixed side seal ring 205, the fixed side O-ring 207 moves toward the fixed side housing 202 while being guided in the diameter-reducing direction by the tapered inner surface 214g of the guide body 214, so that the fixed side O-ring 207 and the fixed side seal ring 205 can be attached to the fixed side housing 202 accurately and easily.

[0103] Furthermore, as in the first embodiment, even if the fixed side seal ring 205 tilts during the pressing operation by the insert 213, a portion of its sliding surface 250 abuts against the end face 212a of the radial portion 212, thereby regulating the tilt of the fixed side seal ring 205.

[0104] Next, a jig according to a fourth embodiment will be described with reference to Fig. 10. Note that the description of the same configuration as in the first embodiment will be omitted.

[0105] As shown in Figure 10, in the jig 510 of this Example 4, the lower inner edge 512c of the radial portion 512, i.e., the corner between the end face 512a and the inner circumferential surface 512b of the radial portion 512, is smoothly curved.

[0106] According to this, even if the fixed side seal ring 505 is tilted during the pressing operation and part of the sliding surface 550 comes into contact with the end face 512a of the radial portion 512, the lower inner edge 512c is curved, so that the sliding surface 550 can be prevented from being damaged by the edge.

[0107] Next, a jig according to a fifth embodiment will be described with reference to Fig. 11. Note that the description of the same configuration as in the first embodiment will be omitted.

[0108] 11 , the jig 610 of the fifth embodiment is provided with an annular protrusion 612c that protrudes downward from an end face 612a on the lower inner edge of the radial portion 612. The lower end face of this annular protrusion 612c is adapted to come into contact with a tapered non-sliding surface 651 formed on the inner diameter side of the sliding surface 650 of the fixed seal ring 605 when the fixed seal ring 605 is tilted.

[0109] According to this, the annular protrusion 612c as a regulating portion abuts against the non-sliding surface 651, thereby regulating the inclination of the fixed side seal ring 605, so that the annular protrusion 612c does not affect the sliding surface 650.

[0110] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0111] For example, in the first to fifth embodiments, the elastic seal members were described as O-rings, but this is not limiting. For example, elastic seal members 707 and 708 as shown in FIG. 12 may be used. The elastic seal member 707 is attached to the inner periphery 702A of the fixed housing 702 and receives a reaction force from the inner circumferential surface 702a and side surface 702b of the inner periphery 702A in the radially inward direction toward the rotating housing 703. The elastic seal member 708 is attached to the inner diameter portion 703A of the rotating housing 703 and receives a reaction force from the inner periphery surface 703a and side surface 703b of the inner diameter portion 703A in the radially inward direction toward the fixed housing 702. This maintains the sliding surfaces 750 and 760 of the fixed seal ring 705 and the rotating seal ring 706 in contact with each other.

[0112] Even with such elastic seal members 707 and 708, it is possible to mount the seal rings on the housing using the jigs as in the first to fifth embodiments without tilting the seal rings.

[0113] In addition, in the above-described Examples 1 to 5, the tip end of the axial portion is a smoothly curved surface, but this is not limiting. For example, the tip end may be tapered or may have a polygonal cross section.

[0114] DESCRIPTION OF SYMBOLS 1 Floating seal device 2 Fixed side housing 3 Track roller (rotating side housing) 5 Fixed side seal ring 6 Rotating side seal ring 7 Fixed side O-ring (elastic seal member) 8 Rotating side O-ring (elastic seal member) 9 Rotating shaft 10 Jig 10A Step portion 11 Axial portion (pressing portion) 11b Inner diameter edge (tip portion) 11c End face (insertion depth regulating portion) 12 Radial portion (regulating portion) 12a End face 12b Inner peripheral surface 50 Sliding surface 60 Sliding surface 210 Jig 213 Insertion body 214 Guide body 214g Inner peripheral surface (tapered surface) 302 Fixed side housing 302B Turned portion 302a End face 305 Fixed side seal ring 307 Fixed side O-ring (elastic seal member) 310 Jig 311 Axial portion 311c End face (opposing surface) 311d Annular convex portion (pressing portion) 312 Radial portion

Claims

1. A jig for attaching an elastic seal member fitted to the outside of a seal ring to the inner peripheral surface of a housing by pressing the elastic seal member in the axial direction, the jig comprising: a pressing portion located on the outer diameter side of the seal ring and capable of pressing the elastic seal member; and a restricting portion located on the inner diameter side of the pressing portion and capable of abutting against the seal ring.

2. The jig according to claim 1, wherein the restricting portion has an annular surface perpendicular to the pressing direction.

3. The jig according to claim 1, wherein at least a portion of said restricting portion is disposed spaced apart from said seal ring.

4. A jig as set forth in claim 1, wherein the seal ring has a sliding surface on the axially opposite side of the housing, and the restricting portion is disposed opposite the sliding surface.

5. A jig as set forth in claim 4, wherein said restricting portion is made of a material having lower rigidity than said seal ring.

6. The jig according to claim 1, wherein the jig is provided with an insertion depth determining portion that determines the insertion depth into the housing.

7. A jig as described in claim 6, wherein the insertion depth determining portion is an opposing surface that abuts against the axial end surface of the housing, and the pressing portion extends from the inner diameter side of the opposing surface toward the housing.

8. The jig described in claim 1, comprising an insert having the pressing portion and the restricting portion, and an annular guide body disposed between the insert and the housing and into which the pressing portion can be inserted, the guide body having a tapered surface whose diameter decreases toward the housing.

9. The jig according to claim 1, wherein the inner edge of the restricting portion is formed into a smooth curved surface.

10. The jig according to claim 1, wherein the tip of the pressing portion is formed into a smoothly curved surface.

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