Jig

Abstract

A jig capable of restricting inclination of a seal ring is provided. A jig (10) which presses an elastic seal member (7) of a seal ring (5) outward in an axial direction to mount the seal ring (5) to an inner peripheral surface of a housing (2) via the elastic seal member (7), wherein the jig (10) has: a pressing site (11) which is arranged on an outer diameter side of the seal ring (5) and is capable of pressing the elastic seal member (7); and a restricting site (12) which is located on an inner diameter side of the pressing site (11) and is capable of abutting against the seal ring (5).

Description

Technical Field

[0001] This invention relates to a fixture for mounting a sealing ring to the inner circumferential surface of a housing. Background Technology

[0002] A floating seal device is known that provides shaft sealing between a fixed-side structure and a rotating-side structure when the rotating-side structure is rotatably connected to the fixed-side structure, similar to a motor, roller, idler wheel, or axle. In such a floating seal device, sealing rings are respectively installed on the housings of the fixed-side structure and the rotating-side structure via O-rings, allowing a pair of sealing rings to slide relative to each other and seal the fluid being sealed.

[0003] In such a floating sealing device, a fixture, such as that shown in Patent Document 1, is used when installing the sealing ring onto the housing. Regarding the fixture shown in Patent Document 1, an O-ring is inserted into the outer circumferential surface of the sealing ring, and the fixture is used to press the O-ring towards the housing side while the O-ring is abutting against the inner circumferential edge of the housing. This moves the sealing ring and the O-ring to the inner circumferential surface of the housing. Thus, the sealing ring is installed on the inner circumferential surface of the housing via the O-ring.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 11-51199 (page 4) Figure 2 ) Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, in a fixture like that in Patent Document 1, when the O-ring is pressed toward the housing side, the O-ring may deform locally and the sealing ring may be installed on the inner circumferential surface of the housing in an inclined state, which may result in poor sliding between the sliding surfaces of the pair of sealing rings.

[0009] This invention was made in view of such a problem, and its purpose is to provide a fixture capable of limiting the tilting of the sealing ring.

[0010] Methods for solving problems

[0011] To solve the above-mentioned problems, the jig of the present invention presses the elastic sealing member that is externally embedded in the sealing ring along the axial direction to install the sealing ring on the inner circumferential surface of the housing via the elastic sealing member. The jig has: a pressing part disposed on the outer diameter side of the sealing ring, which can press the elastic sealing member; and a limiting part located on the inner diameter side of the sealing ring, which can abut against the sealing ring.

[0012] Therefore, when the elastic sealing member is pressed into the housing using the pressing part, the tilting of the sealing ring can be restricted by the limiting part, so that the sealing ring can be installed in the housing without causing the sealing ring to tilt significantly.

[0013] Alternatively, the limiting part may have an annular surface perpendicular to the pressing direction.

[0014] Therefore, the tilt of the sealing ring can be limited regardless of the tilt direction.

[0015] Alternatively, the limiting portion may be configured such that at least a portion is separated from the sealing ring.

[0016] Therefore, when the elastic sealing component is pressed into the housing using the pressing part, the contact between the sealing ring and the limiting part is not easily affected.

[0017] Alternatively, the sealing ring may have a sliding surface on the side opposite to the housing in the axial direction, and the limiting part may be configured opposite to the sliding surface.

[0018] Therefore, after the sealing ring is installed on the inner circumferential surface of the housing, the fixture can be pulled out in the opposite direction of the housing without causing interference between the restricting part and the sealing ring, thus making the installation of the sealing ring simple.

[0019] Alternatively, the restrictive portion may be made of a material with lower rigidity than the sealing ring.

[0020] Therefore, the limiting part is made of a material with lower rigidity than the sealing ring, which can prevent the sliding surface from contacting the limiting part and causing damage to the sliding surface.

[0021] Alternatively, the fixture may have an insertion depth defining section that defines the insertion depth toward the housing side.

[0022] Therefore, the insertion depth of the fixture toward the housing side is specified by the insertion depth specification section, thus enabling the sealing ring to be accurately installed onto the housing.

[0023] Alternatively, the insertion depth specification portion may be a counter surface that abuts against the axial end face of the housing, and the pressing portion may extend from the inner diameter side of the counter surface toward the housing side.

[0024] Therefore, when the opposing surface of the fixture abuts against the end face of the housing, the pressing part is inserted into the inside of the housing, thus allowing the elastic sealing component and sealing ring to be inserted into a deeper position in the housing.

[0025] Alternatively, the fixture may have: an insert having the pressing portion and the limiting portion; and an annular guide disposed between the insert and the housing, capable of inserting the pressing portion inside, the guide having a tapered surface that tapers toward the housing.

[0026] Therefore, by using a conical surface to guide the elastic sealing element towards the housing by reducing its diameter, the sealing ring can be accurately installed on the housing.

[0027] Alternatively, the inner edge of the restricted portion may be formed as a smooth curved surface.

[0028] Therefore, the inner edge of the restrictive part abuts against the inclined sealing ring, thus preventing damage to the sealing ring.

[0029] Alternatively, the front end of the pressing part may be formed as a smooth curved surface.

[0030] This prevents the elastic sealing components from being damaged due to pressure on the pressing part. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view showing the floating sealing device of Embodiment 1 of the present invention.

[0032] Figure 2 This is a schematic cross-sectional view showing the state before the sealing ring is installed on the housing using a fixture.

[0033] Figure 3 This is a schematic cross-sectional view showing the state after the sealing ring has been installed on the housing using a fixture.

[0034] Figure 4 This is a schematic cross-sectional view showing the sealing ring tilted when it is installed on the housing using a fixture.

[0035] Figure 5 This is a schematic cross-sectional view showing the assembled state of a pair of sealing rings mounted on the housing.

[0036] Figure 6 This is a schematic cross-sectional view showing the state before the sealing ring is installed on the housing using a fixture in Embodiment 2 of the present invention.

[0037] Figure 7 This is a schematic cross-sectional view showing the state after the sealing ring is installed on the housing using a fixture in Embodiment 2.

[0038] Figure 8 This is a schematic cross-sectional view showing the state before the sealing ring is installed on the housing using a fixture in Embodiment 3 of the present invention.

[0039] Figure 9This is a schematic cross-sectional view showing the state after the sealing ring is installed on the housing using a fixture in Embodiment 3.

[0040] Figure 10 This is a schematic cross-sectional view showing the state of the sealing ring tilted when the sealing ring is installed on the housing using a jig in Embodiment 3 of the present invention.

[0041] Figure 11 This is a schematic cross-sectional view showing the state of the sealing ring tilted when the sealing ring is installed on the housing using a jig in Embodiment 4 of the present invention.

[0042] Figure 12 This is a schematic cross-sectional view showing a modified example of an elastic sealing component. Detailed Implementation

[0043] Hereinafter, the manner in which the jig is used to implement the present invention will be described based on embodiments.

[0044] Example 1

[0045] Reference Figures 1 to 5 The fixture of Example 1 will be described below. Figure 2 The upper side of the paper is described as the upper side of the jig.

[0046] In the floating sealing device 1 of this embodiment 1, the track roller 3, which serves as the rotating side housing, is connected to the rotating shaft 9 extending from the side frame supporting the track in a manner that allows relative rotation (see reference). Figure 1 In this embodiment, the floating sealing device 1 is used to prevent foreign objects such as sand or mud from entering the rotating shaft 9 through the gap between the fixed side housing 2 and the track roller 3.

[0047] like Figure 1 As shown, the floating sealing device 1 mainly consists of a fixed-side housing 2, a track roller 3, a fixed-side sealing ring 5, a rotating-side sealing ring 6, a fixed-side O-ring 7 as a fixed-side elastic sealing component, and a rotating-side O-ring 8 as a rotating-side elastic sealing component.

[0048] The fixed-side housing 2 is fixed to a side frame (not shown). The track roller 3 is connected to the rotating shaft 9 with the shaft inserted through it. The fixed-side sealing ring 5 is disposed on the inner diameter side of the fixed-side housing 2. The rotating-side sealing ring 6 is disposed on the inner diameter side of the track roller 3. The fixed-side O-ring 7 is located between the fixed-side housing 2 and the fixed-side sealing ring 5. The rotating-side O-ring 8 is located between the track roller 3 and the rotating-side sealing ring 6.

[0049] The track rollers 3 are configured to be axially separated from the fixed side housing 2 and are capable of rotating relative to the fixed side housing 2.

[0050] Furthermore, the sealing rings 5 ​​and 6 and the O-rings 7 and 8 divide the outer space S1, which includes the gap between the fixed side housing 2 and the track roller 3, and the inner space S2, which is on the side of the rotating shaft 9, and seal their boundaries. The fixed side housing 2, the track roller 3, the sealing rings 5 ​​and 6, and the O-rings 7 and 8 will be described in detail below.

[0051] First, the fixed-side housing 2 will be described. (Refer to...) Figure 1 The fixed-side housing 2 is formed as a stepped cylindrical shape that allows for the insertion of the rotating shaft 9 with clearance. An inner circumferential portion 2A is formed on the track roller 3 side and on the inner diameter side of the fixed-side housing 2. This inner circumferential portion 2A is open on the track roller 3 side and recessed axially. A sealing surface 20 is formed on the inner circumferential portion 2A, which decreases in diameter towards the inner diameter side as it moves axially away from the opposing track roller 3 side. Furthermore, the fixed-side housing 2 has a fold-back portion 2B that restricts the fixed-side O-ring 7 from disengaging from the track roller 3 side of the inner circumferential portion 2A.

[0052] Next, the track roller 3 will be described. The track roller 3 is formed as a stepped cylindrical shape that can be externally fitted into the rotating shaft 9. The track roller 3 has an inner circumferential portion 3A formed on the fixed side housing 2 side and the inner diameter side. The inner circumferential portion 3A is open on the fixed side housing 2 side and recessed axially. A sealing surface 30 is formed on the inner circumferential portion 3A. The sealing surface 30 decreases in diameter towards the inner diameter side as it moves away axially from the opposite fixed side housing 2 side. Furthermore, the track roller 3 has a fold-back portion 3B, which prevents the rotating side O-ring 8 from disengaging from the track roller 3 side of the inner circumferential portion 3A.

[0053] Next, the fixed-side sealing ring 5 will be described. The fixed-side sealing ring 5 is made of cast iron and is formed into a stepped cylindrical shape that allows for insertion into the rotating shaft 9 with clearance. The fixed-side sealing ring 5 has an annular sliding surface 50 at the end opposite to the rotating-side sealing ring 6.

[0054] Furthermore, the fixed-side sealing ring 5 has an annular inclined groove 5a recessed towards the inner diameter side at its axial center on the outer diameter side. The bottom surface of this inclined groove 5a is a conical surface 51 that narrows as it moves away from the sliding surface 50.

[0055] In addition, Cr-Mo cast iron and Ni-Cr cast iron are preferred materials when manufacturing the fixed-side sealing ring 5. In addition, copper alloys, carbon steel, SiC, superhard alloys, ceramics, etc. can also be used.

[0056] Next, the rotating side sealing ring 6 will be described. The rotating side sealing ring 6 is made of cast iron and is formed into a stepped cylindrical shape that allows it to be inserted into the rotating shaft 9 with clearance. The rotating side sealing ring 6 has an annular sliding surface 60 at the end opposite to the fixed side sealing ring 5.

[0057] Furthermore, the rotating side sealing ring 6 has an annular inclined groove 6a recessed towards the inner diameter side at the axial center of the outer diameter side. The bottom surface of the inclined groove 6a is a conical surface 61 that narrows as it moves away from the sliding surface 60.

[0058] Furthermore, Cr-Mo cast iron and Ni-Cr cast iron are preferred materials for manufacturing the rotary side sealing ring 6. In addition, copper alloys, carbon steel, SiC, superhard alloys, ceramics, etc. can also be used.

[0059] Next, the fixed-side O-ring 7 and the rotating-side O-ring 8 will be described. The fixed-side O-ring 7 and the rotating-side O-ring 8 are made of rubber material and are formed into rings that can be externally inserted into the inclined grooves 5a and 6a of the fixed-side sealing ring 5 and the rotating-side sealing ring 6.

[0060] The fixed-side O-ring 7 and the rotating-side O-ring 8 are clamped in a compressed state between the fixed-side housing 2 and the fixed-side sealing ring 5, and between the track roller 3 and the rotating-side sealing ring 6. The elastic restoring force of the fixed-side O-ring 7 and the rotating-side O-ring 8 acts in the direction that brings the fixed-side sealing ring 5 and the rotating-side sealing ring 6 closer together.

[0061] Therefore, a specified sliding surface pressure is applied between the sliding surfaces 50 and 60 in the axial direction, and the sliding surfaces 50 and 60 function as a primary seal.

[0062] Furthermore, the fixed-side O-ring 7, which is tightly connected between the fixed-side housing 2 and the fixed-side sealing ring 5, and the rotating-side O-ring 8, which is tightly connected between the track roller 3 and the rotating-side sealing ring 6, function as a secondary seal.

[0063] This reliably prevents foreign objects such as sand or mud from entering the internal space S2, which contains the lubricating oil, from the external space S1. Alternatively, the fluid can be anything other than lubricating oil.

[0064] In addition, 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 DuroA 60 to 70, polyurethane rubber (U), fluororubber (FKM), butyl rubber (IIR), or resins with elasticity.

[0065] Next, the process of installing the fixed-side sealing ring 5 and the fixed-side O-ring 7 onto the fixed-side housing 2 will be described. Furthermore, the installation of the rotating-side sealing ring 6 and the rotating-side O-ring 8 relative to the track roller 3 is substantially the same as the installation of the fixed-side sealing ring 5 and the fixed-side O-ring 7 relative to the fixed-side housing 2, therefore, their description is omitted.

[0066] like Figure 2As shown, firstly, the fixed-side housing 2 is horizontally positioned with its end face 2a facing upwards. Then, the fixed-side sealing ring 5, with the fixed-side O-ring 7 externally embedded in the inclined groove 5a, is positioned above the fixed-side housing 2. At this point, the fixed-side O-ring 7 is locked in place by the folded-back portion 2B.

[0067] Next, the fixture 10 is positioned above the fixed-side O-ring 7 and the fixed-side sealing ring 5. The fixture 10 is made of synthetic resin and is formed into a stepped cylindrical shape.

[0068] Specifically, it has: an axial portion 11 as a pressing part, which is cylindrical and extends axially; and a radial portion 12 as a limiting part, which extends annularly from the upper end of the axial portion 11 in the inner diameter direction.

[0069] At the boundary between the axial portion 11 and the radial portion 12, a stepped portion 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 diameter of the inner circumferential surface 11a of the axial portion 11 is larger than the diameter of the fixed-side sealing ring 5. The diameter of the inner circumferential surface 12b of the radial portion 12 is smaller than the diameter of the fixed-side sealing ring 5. Furthermore, the end face 12a of the radial portion 12 is a flat annular surface perpendicular to the pressing direction.

[0070] Furthermore, the lower end side of the axial portion 11, i.e. the inner diameter end edge 11b of the front end portion, is chamfered to form a smooth curved surface.

[0071] The fixture 10 is externally fitted from above so that the fixed-side sealing ring 5 is positioned on the stepped portion 10A. With the fixture 10 positioned above the fixed-side O-ring 7 and the fixed-side sealing ring 5, the inner diameter end edge 11b of the axial portion 11 abuts against the fixed-side O-ring 7, and the sliding surface 50 of the fixed-side sealing ring 5 and the end face 12a of the radial portion 12 opposite to the sliding surface 50 are separated vertically.

[0072] Next, as Figure 3 As shown, a force is applied from above the fixture 10, pressing the fixed-side O-ring 7 with the inner diameter end edge 11b of the axial portion 11. As a result, the fixed-side sealing ring 5 moves downward together with the fixed-side O-ring 7.

[0073] The fixture 10 presses the fixed-side O-ring 7 and the fixed-side sealing ring 5 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 configured and sized to achieve an appropriate insertion depth relative to the fixed-side housing 2. That is, the end face 11c of the axial portion 11 functions as a portion that defines the insertion depth.

[0074] When using jig 10 to press the fixed-side O-ring 7 and the fixed-side sealing ring 5, as Figure 3 As shown, when the fixed-side sealing ring 5 is not tilted, the sliding surface 50 of the fixed-side sealing ring 5 does not contact the end face 12a of the radial portion 12 and is separated. Therefore, the force in the pressing direction will not be hindered due to the contact between the sliding surface 50 and the end face 12a.

[0075] Furthermore, the inner diameter edge 11b of the fixture 10 abuts against a position closer to the outer diameter side than the center of the cut surface of the fixed-side O-ring 7. Therefore, the fixed-side O-ring 7 receives a downward force from the fixture 10 on the inner diameter side, making it easier to enter between the sealing surface 20 and the conical surface 51. Alternatively, the fixture 10 may abut against the center of the cut surface of the fixed-side O-ring 7 or on the inner diameter side.

[0076] During the pressing operation of the fixture 10 pairs of fixed-side O-rings 7 and fixed-side sealing rings 5, it is sometimes impossible to press the fixed-side O-rings 7 with equal force in the circumferential direction. For example, as Figure 4 As shown, sometimes a local part of the fixed-side O-ring 7 (e.g., the part on the left side of the paper) is jammed by the folded-back part 2B of the fixed-side housing 2 and is greatly compressed and deformed, and does not move downward compared with other parts in the circumferential direction, while other parts in the circumferential direction of the fixed-side O-ring 7 (e.g., the part on the right side of the paper) move downward.

[0077] In this case, along with the fixed-side O-ring 7, the fixed-side sealing ring 5 is tilted relative to the fixture 10, but a portion of the sliding surface 50 of the fixed-side sealing ring 5 abuts against the end face 12a of the radial portion 12, thus limiting the large tilt of the fixed-side sealing ring 5.

[0078] Thus, with the tilt of the fixed-side sealing ring 5 restricted, the fixed-side O-ring 7 and the fixed-side sealing ring 5 move downward, thereby preventing the fixed-side sealing ring 5 from being installed in a manner that is significantly tilted relative to the fixed-side housing 2.

[0079] Furthermore, even if a portion of the sliding surface 50 of the fixed-side sealing ring 5 abuts against the end face 12a of the radial portion 12, the portion other than the abutting portion is separated from the end face 12a, thus reducing the influence on the force in the pressing direction.

[0080] Furthermore, the end face 12a of the radial portion 12 is formed in an annular shape, so that even if the fixed side sealing ring 5 is tilted in any direction, the tilt can be limited.

[0081] Furthermore, since the fixture 10 is ring-shaped, the pressing depth of the fixed-side sealing ring 5 can be visually confirmed through the through hole of the fixture 10 during the pressing operation.

[0082] And, return Figure 3The axial portion 11's end face 11c abuts against the fixed side housing 2's end face 2a in the circumferential direction, defining the insertion depth of the fixed side sealing ring 5 relative to the fixed side housing 2, thus enabling the fixed side sealing ring 5 to be accurately installed on the fixed side housing 2.

[0083] Furthermore, even if the fixed-side sealing ring 5 is tilted before the end face 11c of the axial portion 11 abuts against the end face 2a of the fixed-side housing 2, the contact between the end face 11c of the axial portion 11 and the end face 2a of the fixed-side housing 2 can correct the tilt of the fixed-side sealing ring 5 to a proper degree.

[0084] Furthermore, after the end face 11c of the axial portion 11 abuts against the end face 2a of the fixed side housing 2, that is, after the fixture 10 presses the fixed side O-ring 7 and the fixed side sealing ring 5, the fixture 10 can be pulled out without interfering with the fixed side sealing ring 5 by moving the fixture 10 axially to the side opposite to the fixed side housing 2.

[0085] After that, as Figure 5 As shown, following the same procedure as described above, the rotating side sealing ring 6 and rotating side O-ring 8 are installed on the track roller 3 using jig 10. Then, the fixed side housing 2 and track roller 3 are inserted through the rotating shaft 9. Next, adjustments are made to ensure that the sliding surface 50 of the fixed side sealing ring 5 and the sliding surface 60 of the rotating side sealing ring 6 are in proper surface pressure. The track roller 3 is then fixed to the rotating shaft 9, thus completing the assembly of the floating sealing device 1 (see reference). Figure 1 ).

[0086] The fixture 10 is made of synthetic resin with lower rigidity than the fixed side sealing ring 5. Therefore, even if the fixed side sealing ring 5 is tilted and the sliding surface 50 abuts against the end face 12a of the radial portion 12, damage to the sliding surface 50 can be suppressed.

[0087] Furthermore, the fixture 10 can be made of a material with lower rigidity than the fixed-side sealing ring 5, or it can be made of a metal such as aluminum, and can be freely changed. Moreover, the fixture 10 does not need to be made of a material with lower rigidity than the fixed-side sealing ring 5 as a whole; only the end face 12a of the radial portion 12 needs to be made of a material with lower rigidity.

[0088] Furthermore, the fixed-side sealing ring 5 is disposed on the inner side of the axial portion 11 of the fixture 10, so the fixed-side sealing ring 5 may also abut against the inner circumferential surface 11a of the axial portion 11 when tilted, thereby limiting the tilt.

[0089] Furthermore, since the inner diameter end edge 11b of the axial portion 11 of the pressing fixed side O-ring 7 is chamfered and has a smooth curved surface, damage to the fixed side O-ring 7 can be avoided when pressing.

[0090] Furthermore, since the axial portion 11 and the radial portion 12 are composed of a single component, there will be no relative positional shift between the axial portion 11 and the radial portion 12, thus reliably limiting the tilting of the fixed-side sealing ring 5.

[0091] Furthermore, in this embodiment, the fixed-side sealing ring 5 is shown to be tilted relative to the fixture 10 and the fixed-side housing 2. However, there are also cases where the fixed-side sealing ring 5 is tilted relative to the fixed-side housing 2 because the fixture 10 is tilted relative to the fixed-side sealing ring 5. Even in such cases, the relative tilt between the fixed-side sealing ring 5 and the fixture 10 can be limited by the end face 12a of the radial portion 12.

[0092] Furthermore, in this embodiment, the axial portion 11 is illustrated as being annular, but it is not limited to this. For example, multiple axial portions may be provided separately in the circumferential direction of the annular radial portion 12.

[0093] Furthermore, in this embodiment, the radial portion 12 is shown to be annular, but it is not limited to this; for example, it could also be in the shape of a circular plate. Also, it is possible that multiple radial portions 12 are provided separately in the circumferential direction.

[0094] Example 2

[0095] Next, refer to Figure 6 and Figure 7 The fixture of Example 2 will be described. Furthermore, repeated structural descriptions identical to those of Example 1 will be omitted.

[0096] like Figure 6 As shown, the fixture 310 of this embodiment 2 has an axial portion 311, a radial portion 312, and an inner diameter side step portion 310A.

[0097] The axial portion 311 is cylindrical and extends axially, with its end face 311c being a opposing surface to the end face 302a of the fixed-side housing 302. The diameter of the inner circumferential surface 311a of the axial portion 311 is smaller than the diameter of the inner circumferential edge of the end face 302a of the fixed-side housing 302. That is, the inner circumferential surface 311a of the axial portion 311 is positioned closer to the inner diameter than the inner circumferential edge of the end face 302a of the fixed-side housing 302.

[0098] On the lower inner circumferential side of the axial portion 311, an annular protrusion 311d, serving as a pressing part, extends to a position downwards from the end face 311c. The inner circumferential surface of the annular protrusion 311d is coplanar with the inner circumferential surface 311a of the axial portion 311. The diameter of the outer circumferential surface of the annular protrusion 311d is smaller than the diameter of the inner circumferential edge of the end face 302a of the fixed side housing 302. The lower surface of the annular protrusion 311d is curved.

[0099] The inner diameter side step portion 310A is composed of the inner circumferential surface 311a of the axial portion 311 and the end face 312a of the radial portion 312.

[0100] Next, the process of installing the fixed-side sealing ring 305 and the fixed-side O-ring 307 onto the fixed-side housing 302 will be described.

[0101] First, such as Figure 6 As shown, a fixed-side sealing ring 305, with a fixed-side O-ring 307 embedded therein, is positioned above the fixed-side housing 302. The fixed-side O-ring 307 is held by the inner periphery of the end face 302a of the fixed-side housing 302.

[0102] Next, the fixture 310 is externally fitted from above such that the fixed-side sealing ring 305 is disposed on the inner diameter side step portion 310A. With the fixture 310 disposed above the fixed-side O-ring 307 and the fixed-side sealing ring 305, the annular protrusion 311d of the axial portion 311 abuts against the fixed-side O-ring 307, and the sliding surface 350 of the fixed-side sealing ring 305 and the end face 312a of the radial portion 312 opposite to the sliding surface 350 are separated vertically.

[0103] Next, as Figure 7 As shown, a force is applied from above the fixture 310, and the annular protrusion 311d of the axial portion 311 presses against the fixed-side O-ring 307. As a result, the fixed-side sealing ring 305 moves downward together with the fixed-side O-ring 307.

[0104] The fixture 310 presses the fixed-side O-ring 307 and the fixed-side sealing ring 305 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 into a position lower than the end face 302a of the fixed-side housing 302, that is, inside the fixed-side housing 302.

[0105] Therefore, the fixed-side O-ring 307 is positioned at an appropriate insertion depth that extends downward beyond the fold-back portion 302B of the fixed-side housing 302. That is, the end face 311c of the axial portion 311 functions as a portion that defines the insertion depth. Thus, the fixture 310 of this embodiment 2 can insert the fixed-side sealing ring 305 and the fixed-side O-ring 307 to a suitable position that extends downward beyond the fold-back portion 302B of the fixed-side housing 302, thereby enabling the fixed-side O-ring 307 to be pressed against the inner circumferential surface of the fixed-side sealing ring 305 and the fixed-side housing 302 with appropriate surface pressure.

[0106] Furthermore, the radial width of the annular protrusion 311d in the 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. Therefore, during the pressing operation of the jig 310, the annular protrusion 311d can cause the fixed-side O-ring 307 to elastically deform and sink into the fixed-side O-ring 307. As a result, a greater elastic restoring force of the fixed-side O-ring 307 can be obtained, so the fixed-side sealing ring 305 is less likely to tilt during the pressing operation of the jig 310. During the pressing operation of the jig 310, if the fixed-side sealing ring 305 tilts, the end face 312a of the radial portion 312 can be used to limit the large tilt of the fixed-side sealing ring 305, and the tilt can be immediately corrected by the elastic restoring force of the fixed-side O-ring 307.

[0107] In addition, in this embodiment 2, the inner and outer peripheral surfaces of the annular protrusion 311d are shown to extend axially, but it is not limited to this. It is also possible that one or both of the inner and outer peripheral surfaces of the annular protrusion are inclined conical surfaces, which can be matched with the shape of the folded-back portion and the inner peripheral surface of the housing.

[0108] Furthermore, in this embodiment 2, the pressing part is illustrated as an annular protrusion 311d, but it is not limited to annular. One or more pressing parts extending into the inner side of the housing may be provided in the circumferential direction.

[0109] Furthermore, the axial length of the pressing portion extending inwards from the housing can be freely varied, but preferably, for example, it is an axial length equal to or greater than the inner circumferential surface of the folded-back portion of the housing. As long as the pressing portion has an axial length equal to or greater than the inner circumferential surface of the folded-back portion of the housing, the elastic ring can be reliably inserted into a position that axially extends beyond the folded-back portion.

[0110] Example 3

[0111] Next, refer to Figure 8 and Figure 9 The fixture of Example 3 will be described. Furthermore, repeated structural descriptions identical to those of Example 1 will be omitted.

[0112] like Figure 8 As shown, the fixture 210 of this embodiment 3 has an insert 213 and a guide 214.

[0113] The insert 213 has an axial portion 211, a radial portion 212, an inner diameter side step portion 210A, an outer diameter side step portion 210B, and a flange portion 215.

[0114] The axial portion 211 is cylindrical and extends axially. Its end face 211c is chamfered and is a smooth curved surface. Furthermore, the outer peripheral surface 211d of the axial portion 211 is a conical surface that tapers in diameter from above toward the end face 211c.

[0115] The inner diameter side step portion 210A is composed of the inner circumferential surface 211a of the axial portion 211 and the end face 212a of the radial portion 212.

[0116] The outer diameter side step portion 210B is composed of the outer peripheral surface 211d of the axial portion 211 and the end surface 211e extending from the upper edge of the outer peripheral surface 211d toward the outer diameter side.

[0117] The flange 215 is formed to extend from the upper end of the insert 213 toward the outer diameter side. The flange 215 is used as a handle for the operator to hold when moving the insert 213 or when adjusting its position.

[0118] The guide body 214 is a ring made of synthetic resin, mainly having an axial portion 214a, a radial portion 214b, a stepped portion 214c, and a flange portion 214d. Alternatively, the guide body 214 can also be made of metals such as cast iron or aluminum.

[0119] The axial portion 214a is an annular shape with a diameter larger than that of the fixed side housing 202.

[0120] The radial portion 214b is an annular shape with a diameter smaller than that of the fixed-side housing 202. The inner circumferential surface 214g of the radial portion 214b is a tapered surface that tapers downward toward the fixed-side housing 202.

[0121] The inner circumferential surface 214g is substantially parallel to the outer circumferential surface 211d of the axial portion 211 of the insert 213. Furthermore, the lower edge of the inner diameter of the inner circumferential surface 214g is set to be approximately the same diameter as the inner diameter of the folded-back portion 202B of the fixed-side housing 202.

[0122] The stepped portion 214c is composed of the inner circumferential surface 214e of the axial portion 214a and the end face 214f ​​of the radial portion 214b.

[0123] The flange 214d is formed to extend from the upper end of the guide 214 toward the outer diameter side. The flange 214d is used as a handle for the operator to hold when moving the guide 214 or when adjusting its position.

[0124] Next, the process of installing the fixed-side sealing ring 205 and the fixed-side O-ring 207 onto the fixed-side housing 202 will be described.

[0125] First, the guide body 214 is positioned on the fixed-side housing 202. At this time, the inner circumferential surface 214e of the axial portion 214a is positioned on the outer diameter side of the outer circumferential surface of the fixed-side housing 202, and the end face 214f ​​of the radial portion 214b rests on the end face 202a of the fixed-side housing 202. In other words, the guide body 214 is externally fitted into the fixed-side housing 202 using the stepped portion 214c. Therefore, the relative horizontal movement of the guide body 214 with respect to the fixed-side housing 202 is restricted.

[0126] Next, a fixed-side sealing ring 205, with a fixed-side O-ring 207 embedded therein, is positioned above the guide body 214. The fixed-side O-ring 207 is held by the inner circumferential surface 214g of the guide body 214.

[0127] Next, as Figure 8 As shown, the insert 213 is externally fitted from above such that the fixed-side sealing ring 205 is disposed on the inner diameter side step portion 210A. With the insert 213 positioned above the fixed-side O-ring 207 and the fixed-side sealing ring 205, the end face 211c of the axial portion 211 abuts against the fixed-side O-ring 207, and the sliding surface 250 of the fixed-side sealing ring 205 and the end face 212a of the radial portion 212 opposite to the sliding surface 250 are separated vertically.

[0128] Next, as Figure 9 As shown, a force is applied from above the insert 213, pressing the fixed-side O-ring 207 with the end face 211c of the axial portion 211. As a result, the fixed-side sealing ring 205 moves downward together with the fixed-side O-ring 207.

[0129] The insertion body 213 presses against the fixed-side O-ring 207 and the fixed-side sealing ring 205 until the end face 211e of the insertion body 213 abuts against the end face 214h of the guide body 214. The configuration is such that when the end face 211e of the insertion body 213 abuts against the end face 214h of the guide body 214, the fixed-side O-ring 207 reaches an appropriate insertion depth relative to the fixed-side housing 202. That is, the end face 211e of the insertion body 213 and the end face 214h of the guide body 214 function as a portion defining the insertion depth.

[0130] Thus, when the inserter 213 presses the fixed-side O-ring 207 and the fixed-side sealing ring 205, the fixed-side O-ring 207 is guided towards the fixed-side housing 202 by the tapered inner circumferential surface 214g of the guide body 214 in the direction of diameter reduction. Therefore, the fixed-side O-ring 207 and the fixed-side sealing ring 205 can be installed accurately and easily relative to the fixed-side housing 202.

[0131] Furthermore, similar to Embodiment 1 above, even if the fixed-side sealing ring 205 tilts during the pressing operation of the insert 213, the tilting of the fixed-side sealing ring 205 can be limited by the contact between a portion of the sliding surface 250 of the fixed-side sealing ring 205 and the end face 212a of the radial portion 212.

[0132] Example 4

[0133] Next, refer to Figure 10 The fixture of Example 4 will be described. Furthermore, repeated structural descriptions identical to those of Example 1 will be omitted.

[0134] like Figure 10 As shown, in the fixture 510 of this embodiment 4, the lower inner edge 512c of the radial portion 512, that is, the corner between the end face 512a of the radial portion 512 and the inner peripheral surface 512b, is a smooth curved surface.

[0135] Therefore, during the pressing operation, even if the fixed side sealing ring 505 is tilted and a portion of the sliding surface 550 abuts against the end face 512a of the radial portion 512, the sliding surface 550 can be prevented from being damaged by the edge because the lower inner edge 512c is curved.

[0136] Example 5

[0137] Next, refer to Figure 11 The fixture of Example 5 will be described. Furthermore, repeated structural descriptions identical to those of Example 1 will be omitted.

[0138] like Figure 11 As shown, in this embodiment 5, the fixture 610 has an annular protrusion 612c that protrudes downward from the end face 612a on the lower inner edge of the radial portion 612. When the fixed-side sealing ring 605 is tilted, the lower end face of the annular protrusion 612c abuts against the conical non-sliding surface 651 formed on the inner diameter side of the sliding surface 650 of the fixed-side sealing ring 605.

[0139] Therefore, by the annular protrusion 612c, which serves as a limiting part, abutting against the non-sliding surface 651, the tilting of the fixed-side sealing ring 605 is limited, so the annular protrusion 612c will not affect the sliding surface 650.

[0140] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments, and changes and additions that do not depart from the spirit of the present invention are also included in the present invention.

[0141] For example, in the aforementioned embodiments 1 to 5, the elastic sealing member was described as an O-ring, but it is not limited to this. For example, it could also be... Figure 12The elastic sealing members 707 and 708 are shown. The elastic sealing member 707 is configured to be installed on the inner peripheral portion 702A of the fixed-side housing 702, and receives a reaction force from the inner peripheral surface 702a and side surface 702b constituting the inner peripheral portion 702A in the direction of the inner diameter and the direction of the rotating-side housing 703. The elastic sealing member 708 is configured to be installed on the inner diameter portion 703A of the rotating-side housing 703, and receives a reaction force from the inner peripheral surface 703a and side surface 703b constituting the inner diameter portion 703A in the direction of the inner diameter and the direction of the fixed-side housing 702. This maintains the sliding surfaces 750 and 760 of the fixed-side sealing ring 705 and the rotating-side sealing ring 706 in contact with each other.

[0142] Even with such resilient sealing components 707 and 708, the sealing ring can be installed on the housing without tilting using a fixture similar to those in the aforementioned embodiments 1 to 5.

[0143] Furthermore, in the aforementioned embodiments 1 to 5, the front end of the axial portion is shown to be a smooth curved surface, but this is not a limitation. For example, the front end can be conical or polygonal in cross-section.

[0144] Label Explanation

[0145] 1: Floating sealing device; 2: Fixed side housing; 3: Track roller (rotating side housing); 5: Fixed side sealing ring; 6: Rotating side sealing ring; 7: Fixed side O-ring (elastic sealing component); 8: Rotating side O-ring (elastic sealing component); 9: Rotating shaft; 10: Fixture; 10A: Stepped portion; 11: Axial portion (pressing portion); 11b: Inner diameter end edge (front end); 11c: End face (insertion depth specification portion); 12: Radial portion (restriction portion); 12a: End face; 12b: Inner circumferential surface; 50: Sliding surface; 60: Sliding surface; 210: Fixture; 213: Insert body; 214: Guide body; 214g: Inner circumferential surface (conical surface); 302: Fixed side housing; 302B: Fold-back portion; 302a: End face; 305: Fixed side sealing ring; 307: Fixed side O-ring (elastic sealing component); 310: Fixture; 311: Axial portion; 311c: End face (opposing surface); 311d: Annular protrusion (pressing portion); 312: Radial portion.

Claims

1. A fixture that presses an elastic sealing member externally fitted to a sealing ring along the axial direction to mount the sealing ring onto the inner circumferential surface of a housing via the elastic sealing member, wherein, The fixture has the following features: The pressing part, located on the outer diameter side of the sealing ring, is capable of pressing the elastic sealing component; and The limiting part is located on the inner diameter side of the pressing part and can abut against the sealing ring.

2. The fixture according to claim 1, wherein, The limiting part has an annular surface perpendicular to the pressing direction.

3. The fixture according to claim 1, wherein, The limiting portion is configured such that at least a portion of it is separated from the sealing ring.

4. The fixture according to claim 1, wherein, The sealing ring has a sliding surface on the side opposite to the housing in the axial direction, and the limiting part is configured opposite to the sliding surface.

5. The fixture according to claim 4, wherein, The restrictive portion is made of a material with lower rigidity than the sealing ring.

6. The fixture according to claim 1, wherein, The fixture has an insertion depth defining section that defines the insertion depth toward the housing side.

7. The fixture according to claim 6, wherein, The specified insertion depth is a counterface that abuts against the axial end face of the housing. The pressing part extends from the inner diameter side of the opposing surface toward the housing side.

8. The fixture according to claim 1, wherein, The fixture has the following features: An insert having the pressing portion and the restricting portion; and An annular guide body, disposed between the insert and the housing, allows the pressing portion to be inserted internally. The guide has a tapered surface that tapers towards the housing.

9. The fixture according to claim 1, wherein, The inner edge of the restricted portion is formed as a smooth curved surface.

10. The fixture according to claim 1, wherein, The front end of the pressing part is formed into a smooth curved surface.

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