JP2007021694A - Ring mounting holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ring mounting holder that allows a user to continuously use the same holder even if the specifications of a piston (a mounting member) 51 regarding an axial position of a mounting groove 52 are changed. <P>SOLUTION: The ring mounting holder has a slide jig, which is provided with a conical face-like slide face for elastically expanding the diameter of a ring 54, and a pushing jig for sliding the ring 54 while pressing it. The slide jig has a second slide jig 6 in addition to a first slide jig provided with the slide face. The second slide jig 6 is externally inserted into the mounting member 51 in a state of holding the ring 54, whose diameter is expanded with the first slide jig, and allows the ring 54 to be mounted into a mounting groove 52 by drawing out the second slide jig 6 while pressing the ring 54 near the mounting groove 52. The second slide jig 6 is formed into such a shape as to have an inner diameter dimension larger than an outer diameter dimension of the mounting member 51 over the whole axial length, and thus the depth of external insertion to the mounting member 51 is not restricted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ring mounting jig used when mounting a ring such as a combination seal on a mounting member such as a piston.

  For example, as shown in FIG. 3A, when a combination seal 53, which is a kind of piston seal, is mounted in an annular mounting groove 52 provided on the outer peripheral surface of a piston (center swivel) 51, conventionally, FIG. The ring mounting jig shown in FIG.

  As shown in an enlarged view in FIG. 3B, the combination seal 53 is a combination of a resin sliding ring 54 and a rubber back ring 55. The former is relatively hard and difficult to mount due to the characteristics of the material. The ring mounting jig shown in FIG. 4 is used when mounting the sliding ring 54 (hereinafter also simply referred to as a ring) 54 in the mounting groove 52. That is, the inner diameter dimension of the sliding ring 54 is much smaller than the outer diameter dimension of the piston 51, and the sliding ring 54 is relatively hard and hardly elastically deformed due to the characteristics of the material as described above. It cannot be mounted in the groove 52, and therefore a dedicated ring mounting jig is used. Since the piston 51 of FIG. 3 has a plurality of mounting grooves 52 (four locations in the figure), a combination seal 53 is mounted in each of the plurality of mounting grooves 52.

  The ring mounting jig in FIG. 4 includes a slide jig 61 and a pushing jig 71.

  The slide jig 61 has a cylindrical main body 62 that is abutted against the end surface 51a of the piston 51 during the mounting operation, and elastically while sliding the ring 54 in the axial direction on the outer peripheral surface of the cylindrical main body 62. A conical slide surface 63 for expanding the diameter is provided. In addition, a cylindrical tip portion 64 that is detachably inserted on the outer peripheral side of the piston 51 is integrally formed on the distal end side (right side in the drawing) of the cylindrical main body 62, and the outer peripheral surface of the cylindrical tip portion 64. In addition, a cylindrical slide surface 65 having the same diameter as the maximum diameter of the conical slide surface 63 is provided. Further, the axial length of the cylindrical tip 64 is formed in accordance with the axial length from the end surface 51a of the piston 51 to the mounting groove 52 at the farthest (far position).

  On the other hand, the pushing jig 71 is formed in a cylindrical shape having a large diameter so as to be extrapolated to the outer peripheral side of the slide jig 61, and a ring 54 set on the slide jig 61 is pressed to the tip thereof. A tip pressing portion 72 that is slid along the slide surfaces 63 and 65 is provided.

  When the ring 54 is mounted on the mounting groove 52 using the ring mounting jig having the slide jig 61 and the pushing jig 71, the slide jig 61 is set on the piston 51 as shown in FIG. At the same time, a ring 54 is set on the conical slide surface 63 of the slide jig 61, and this ring 54 is pressed in the axial direction by the pushing jig 71 (arrow A). The pressed ring 54 slides on the conical slide surface 63 in the axial direction, and at this time, the diameter of the ring 54 is gradually elastically increased according to the taper of the conical slide surface 63. The expanded ring 54 continues to slide in the axial direction on the cylindrical slide surface 65 while maintaining the expanded diameter, and at the same time as it is detached from the tip of the cylindrical tip 64 as shown in FIG. The diameter is elastically restored and the mounting groove 52 is mounted.

  Next, the ring 54 is mounted in the second mounting groove 52 from the back. At this time, the slide jig 61 is once removed from the piston 51 and slides with the end surface 51a of the piston 51 as shown in FIG. A spacer 81 is interposed between the cylindrical body 62 of the jig 61, and in this state, the mounting operation is performed in the same procedure as described above. The axial width of the spacer 81 is the same as the difference between the axial length from the end surface 51 a of the piston 51 to the innermost mounting groove 52 and the axial length from the end surface 51 a of the piston 51 to the second mounting groove 52 from the back. Since it is formed in a size, the tip of the cylindrical tip 64 of the slide jig 61 is arranged at a position that matches the second mounting groove 52 by the spacer 81, and the mounting operation is performed in this state. . Next, the ring 54 is mounted in the third mounting groove 52. At this time, after replacing the spacer 81 with one having a larger axial width, the mounting operation is performed in the same manner as described above, and the fourth (most front side) When the ring 54 is mounted in the mounting groove 52, the spacer 81 is replaced with one having a larger axial width, and then the mounting operation is performed in the same procedure as described above.

  In addition, the ring 54 mounted in each mounting groove 52 is mounted in the mounting groove 52 as a result of the diameter reduction, but since the diameter is once greatly expanded as described above during the mounting operation, the degree of diameter reduction is increased. It may be insufficient and the outer diameter as it is may be too large to match the inner diameter of the cylinder 56 combined with the piston 51. Therefore, a ring diameter dimension correcting operation is performed as a mounting finishing operation, and a correcting jig 91 which is a part of the same ring mounting jig is used for this operation.

  As shown in FIG. 5, the correction jig 91 is formed in a cylindrical shape having an inner diameter that is the same as the inner diameter of the cylinder 56, and a conical guide surface 92 is provided on the inner periphery of the tip. On the inner periphery of the rear end, an inwardly hooked stopper portion 93 that is abutted against the end surface 51a of the piston 51 is provided. Further, the axial length of the correction jig 91 is slightly larger than the axial length from the end surface 51a of the piston 51 to the innermost mounting groove 52 so that all the rings 54 can be corrected together. . Then, when the correcting jig 91 is pushed in the axial direction with respect to the piston 51 (arrow B) and a predetermined time elapses, the rings 54 mounted in the mounting grooves 52 are gathered together by a so-called brazing action by a diaphragm. To reduce the diameter.

  However, the conventional ring mounting jig has the following disadvantages.

  That is, as shown in FIG. 4, the slide jig 61 is used in a state where the cylindrical main body 62 is abutted against the end surface 51 a of the piston 51. Therefore, when the specification of the piston 51 is changed and the axial length from the end surface 51a of the piston 51 to the innermost mounting groove 52 is extended, the tip of the cylindrical tip portion 64 of the slide jig 61 is attached to the mounting groove. In this case, the ring 54 cannot be mounted in the mounting groove 52. The same applies when the axial length of the pushing jig 71 is insufficient.

  The spacer 81 is formed so that its axial width matches the axial length from the end surface 51 a of the piston 51 to each mounting groove 52. Therefore, when the specification of the piston 51 is changed and the axial length from the end surface 51 a of the piston 51 to the mounting groove 52 is changed, the tip of the cylindrical tip 64 of the slide jig 61 and the mounting groove 52 are changed. A situation occurs in which the axial positions do not match. In this case, the ring 54 cannot be mounted in the mounting groove 52.

  Further, as shown in FIG. 5, the correction jig 91 is used by being pushed in the axial direction with respect to the piston 51 until the inwardly hooked stopper portion 93 hits the end surface 51 a of the piston 51. It is. Therefore, when the specification of the piston 51 is changed and the axial length from the end surface 51a of the piston 51 to the innermost mounting groove 52 is extended as described above, the correction jig 91 reaches the mounting groove 52. In this case, the ring 54 mounted in the mounting groove 52 cannot be corrected.

  In the above case, every time the specification of the piston 51 is changed, the jig and the spacer 81 must be remanufactured in accordance with the new specification.

  Incidentally, as disclosed in the following Patent Document 1 or 2, etc., it is a known technique to elastically expand the diameter by sliding the elastic ring along the conical slide surface.

JP-A-11-285987 No. 2603854 Utility Model Registration Gazette

  In view of the above, the present invention has an object to provide a ring mounting jig that can continue to use the same jig even if the specifications of a mounting member such as a piston are changed with respect to the axial position of the mounting groove. In addition, an object of the present invention is to provide a ring mounting jig in which a spacer can be omitted from the components of the mounting jig.

  In order to achieve the above object, a ring mounting jig according to claim 1 of the present invention is a mounting jig used when a ring such as a combination seal is mounted in an annular mounting groove provided on an outer peripheral surface of a mounting member such as a piston. A slide jig provided with a conical slide surface that elastically expands the diameter while sliding the ring in the axial direction, and pressing the ring set on the slide jig to the slide surface And a pushing jig that is slid along, the sliding jig has a second sliding jig in addition to the first sliding jig provided with the sliding surface, and the second sliding jig A ring attached to the mounting groove by holding the ring expanded in diameter by the first slide jig and holding the ring near the mounting groove and pulling out the second slide jig. There, and characterized in that it is shaped not limited outer 挿深 is relative to the mounting member has a larger inner diameter than the outer diameter of the mounting member over the axial length.

  Further, the ring mounting jig according to claim 2 of the present invention is the ring mounting jig according to claim 1, wherein the second slide jig is a ring holder that holds a ring whose diameter is enlarged by the first slide jig. And a pulling-out operation unit used when pulling out the second slide jig.

  Furthermore, the ring mounting jig according to claim 3 of the present invention is the ring mounting jig according to claim 1 or 2, wherein the ring mounting jig includes a mounting groove in addition to the slide jig and the pushing jig. A correction jig for correcting the outer diameter of the ring mounted on the ring, and the correction jig also has an inner diameter larger than the outer diameter of the mounting member over the entire length in the axial direction. The extrapolation depth with respect to the mounting member is not limited.

  According to the mounting jig of the present invention having the above-described configuration, the ring mounting operation is performed as follows.

  That is, first, a ring is set on the conical slide surface of the first slide jig, and the ring is elastically expanded while being pressed and slid in the axial direction by the pushing jig, and then the second slide jig. Let the tool hold. Next, the second slide jig holding the ring is extrapolated to a mounting member such as a piston, and one end of the second slide jig is aligned with the mounting groove in the axial direction. Next, when the second slide jig is pulled out so as not to move while pressing the ring, the ring is elastically restored to a reduced diameter at the same time as being detached from the second slide jig, and is mounted in the mounting groove. The second slide jig has an inner diameter dimension that is larger than the outer diameter dimension of the mounting member over its entire length in the axial direction, and the extrapolation depth with respect to the mounting member is not limited. You can crawl and slide freely. Therefore, even if the specification of the mounting member is changed with respect to the axial position of the mounting groove, a situation in which the jig is too short to reach the mounting groove does not occur.

  In addition to the ring holding part that holds the ring expanded by the first slide jig in the expanded state, the second slide jig responsible for this direct mounting work is used when pulling out the second slide jig It is preferable to provide a pull-out operation part used for the above-mentioned, and when the pull-out operation part is provided in this way, the second slide jig can be easily pulled out (Claim 2).

  Further, the correction jig, which is an optional component in the present invention, has an inner diameter dimension that is larger than the outer diameter dimension of the mounting member over the entire length in the axial direction, and has an extrapolation depth with respect to the mounting member. If it is not limited, it is possible to cope with changes in the specifications of the mounting member such as the piston with respect to the axial position of the mounting groove.

  The present invention has the following effects.

  That is, in the ring mounting jig according to claim 1 of the present invention having the above-described configuration, the slide jig is provided with a second slide jig in addition to the first slide jig having a conical slide surface, The second slide jig is extrapolated to the mounting member while holding the ring expanded in diameter by the first slide jig, and the ring is formed by pulling out the second slide jig while holding the ring near the mounting groove. Is mounted in the mounting groove, and has an inner diameter larger than the outer diameter of the mounting member over the entire length in the axial direction, and the extrapolation depth with respect to the mounting member is not limited. The second slide jig can be set at a desired axial position over the entire length of the mounting member. Therefore, even if the specification of the mounting member is changed and the position of the mounting groove is changed, the mounting work can be performed by changing the set position according to this, and the jig needs to be remanufactured There is no. Further, even when a plurality of mounting grooves are provided, the mounting operation by the jig can be performed by sequentially changing the setting position of the second slide jig, and the spacer can be omitted.

  In addition to this, in the ring mounting jig according to claim 2 of the present invention having the above-described configuration, since the second slide jig is provided with a drawing operation portion in addition to the ring holding portion, the jig The drawing work can be facilitated.

  In the ring mounting jig according to claim 3 of the present invention having the above-described configuration, the correction jig has an inner diameter dimension that is larger than the outer diameter dimension of the mounting member over the entire length in the axial direction. Since the extrapolation depth with respect to is not limited, it is possible to correct the diameter of all the rings without being limited by the extrapolation depth.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a ring mounting jig according to an embodiment of the present invention. The ring mounting jig according to the embodiment includes a plurality of (in the figure,) provided on the outer peripheral surface of a piston (center swivel) 51. Each of the six mounting grooves 52 is used for mounting the resin sliding ring 54 in the combination seal 53 shown in FIG.

  The ring mounting jig according to the embodiment has a slide jig 1 and a pushing jig 11, and both jigs 1 and 11 are configured as follows.

  That is, first, the slide jig 1 is composed of a combination of the first slide jig 2 and the second slide jig 6, and the second slide jig 6 is detachably combined with the first slide jig 2. Yes.

  The first slide jig 2 has a cylindrical jig body 3, and a conical surface-like shape that elastically expands the diameter while sliding the ring 54 in the axial direction on the outer circumferential surface of the jig body 3. A slide surface 4 is provided. A cylindrical jig holding portion 5 that holds the second slide jig 6 slidably in the axial direction is integrally formed on the outer peripheral side of the front end side (right side in the figure) of the jig main body 3. . The minimum outer diameter of the conical slide surface 4 is smaller than the inner diameter of the ring 54 so that the ring 54 can be set on the slide surface 4. The maximum outer diameter of the slide surface 4 is increased. The diameter of the ring 54 is larger than the outer diameter of the piston 51 so that it can be extrapolated to the piston 51.

  The second slide jig 6 has a cylindrical ring holding part 7 that is slidably held in the axial direction on the outer peripheral side of the jig holding part 5 of the first slide jig 2, and this ring holding part. On the tip end side (right side in the figure) of FIG. 7, an outward (right side in the figure) bowl-shaped pulling operation portion 8 is integrally formed. The outer diameter of the ring holding portion 7 is the same as the maximum outer diameter of the slide surface 4 of the first slide jig 2 so that the ring 54 can smoothly slide from the slide surface 4 to the ring holding portion 7. Is formed.

  The inner diameter dimension of the second slide jig 6 is formed larger than the outer diameter dimension of the piston 51 over the entire length in the axial direction. That is, the second slide jig 6 has an axial through hole 9 whose inner diameter dimension is set to be larger than the outer diameter dimension of the piston 51 over the entire length in the axial direction. Is inserted on the outer peripheral side of the piston 51. Therefore, the second slide jig 6 has a shape that allows the outer peripheral side of the piston 51 to pass through from one axial direction to the other without limiting the extrapolation depth with respect to the piston 51.

  On the other hand, the pushing jig 11 is formed in a large-diameter cylindrical shape so as to be inserted on the outer peripheral side of the jig body 3 of the first slide jig 2 and the ring holding portion 7 of the second slide jig 6. A tip pressing portion 12 is provided at the tip (right side in the figure) to press the ring 54 set on the first slide jig 2 and slide it axially to the ring holding portion 7 of the second slide jig 6. Yes.

  When the ring 54 is mounted on the mounting groove 52 using the ring mounting jig having the slide jig 1 and the pushing jig 11, the mounting jig is attached to the piston 51 as shown in FIG. Before setting the ring 54, the ring 54 is set on the slide surface 4 of the first slide jig 2, and the ring 54 is pressed in the axial direction by the pushing jig 11 (arrow A). As shown in FIG. 3, the second slide jig 6 is slid onto the ring holding portion 7. The ring 54 pressed by the pushing jig 11 is gradually elastically expanded in diameter according to the taper of the slide surface 4 when sliding on the slide surface 4, and the second slide is maintained while maintaining this expanded state. It is held on the ring holding part 7 of the jig 6.

  Next, the pushing jig 11 is removed, and the second slide jig 6 holding the ring 54 is removed from the first slide jig 2 as shown in FIG. As described above, the second slide jig 6 is extrapolated to the outer periphery of the piston 51, and the open end 7a of the ring holding portion 7 is aligned with the mounting groove 52 from which the ring 54 is to be mounted in the axial direction. In the figure, since the ring 54 is to be mounted in the innermost mounting groove 52, the open end 7 a of the ring holding portion 7 is aligned with the inner side wall on the front side of the mounting groove 52.

  Next, the ring 54 is pressed so as not to move, and in this state, the pulling operation portion 8 of the second slide jig 6 is grasped, and the second slide jig 6 is strongly pulled out to the near side (left side in the figure). Then, the ring 54 is detached from the second slide jig 6 and elastically recovers its diameter at the same time as the ring 54 is removed, so that the ring 54 is mounted in the mounting groove 52 immediately below the ring 54.

  Next, the ring 54 is mounted in the other mounting groove 52. At this time, the above procedure is repeated, and as shown in FIG. 2 (B), the open end portion 7a of the ring holding portion 7 is mounted and the ring 54 is mounted from now on. Align with the mounting groove 52 to be axially aligned. In the figure, since the ring 54 is to be mounted in the second mounting groove 52 from the back, the open end 7a of the ring holding portion 7 is aligned with the inner side wall on the front side of the mounting groove 52. . Subsequent procedures are the same as described above, and this is repeated for the number of mounting grooves 52, and the rings 54 are mounted in all the mounting grooves 52.

  In addition, as described in the above-mentioned section of the prior art, the ring 54 mounted in each mounting groove 52 is mounted in the mounting groove 52 as a result of the return of the diameter reduction. The degree of diameter reduction may be inadequate, and the diameter dimension as it is may be too large to match the inner diameter dimension of the cylinder 56 combined with the piston 51. Therefore, a ring diameter dimension correcting operation is performed as a mounting finishing operation, and the correcting jig 21 which is a part of the same ring mounting jig is used for this operation.

  As shown in FIG. 2 (C), the correction jig 21 according to the embodiment is formed in a cylindrical shape as a whole, and has an inner diameter that is the same as the inner diameter of the cylinder 56 on the inner peripheral surface thereof. A cylindrical correction surface 22 is provided. Further, conical guide surfaces 23 are provided at both ends of the correction surface 22 in the axial direction. Further, an outward flange-like operation portion 24 is integrally formed at the rear end portion of the correction jig 21.

  Further, the correction jig 21 has the correction surface 22 and the guide surface 23 having the above-mentioned diameter dimensions, and thus the axial direction in which the inner diameter dimension is set larger than the outer diameter dimension of the piston 51 over the entire length in the axial direction. A through-hole 25 is provided, and the through-hole 25 is extrapolated to the outer peripheral side of the piston 51. Therefore, the correction jig 21 is not limited in the extrapolation depth with respect to the piston 51, and has a shape that allows the piston 51 to pass through from one axial direction to the other.

  When the diameter of the ring 54 is corrected using the correction jig 21, as shown in FIG. 2C, the correction jig 21 is pushed into the piston 51 in the axial direction (arrow B). Then, after the elapse of a predetermined time, the correction jig 21 is pulled out from the piston 51. Then, the ring 54 mounted in each mounting groove 52 is collectively reduced in diameter.

  According to the ring mounting jig having the above-described configuration, the following operational effects can be achieved.

  That is, in the ring mounting jig configured as described above, the second slide jig 6 is provided in addition to the first slide jig 2 provided with the conical slide surface 4 on the slide jig 1 for expanding the diameter of the ring 54. The second slide jig 6 is extrapolated to the piston 51 in a state where the ring 54 whose diameter has been expanded by the first slide jig 2 is held by the ring holding portion 7, and the open side tip portion 7 a of the ring holding portion 7. Is aligned with the mounting groove 52 in the axial direction, and the ring 54 is mounted in the mounting groove 52 by holding the ring 54 and pulling out the second slide jig 6, and over the entire axial length thereof. Since the outer diameter of the piston 51 is larger than the outer diameter of the piston 51 and the extrapolation depth with respect to the piston 51 is not limited, the second slide jig 6 has the same length as the entire length of the piston 51. Desired Is it possible to set the axial position. Therefore, even if the specification of the piston 51 is changed with respect to the axial position of the mounting groove 52, it is possible to perform the mounting work by the jig 6 by changing the set position according to this, and accordingly, according to the change of the specification. It is possible to save the trouble of remanufacturing the jig 6 one by one (the ring can be mounted regardless of the distance from the piston end to the seal groove). Further, even when a plurality of mounting grooves 52 are provided in the axial direction, the mounting operation by the jig 6 can be performed by sequentially changing the set position of the second slide jig 6 on the piston 51. Spacers in the prior art can be omitted.

  Further, since the second slide jig 6 is provided with a pull-out operation section 8 in addition to the ring holding section 7, the second slide jig can be pulled out by grasping the pull-out operation section 8 and performing the jig pull-out operation. The tool 6 can be easily pulled out.

  In addition to the second slide jig 6, the correction jig 21 also has an inner diameter dimension that is larger than the outer diameter dimension of the piston 51 over the entire axial length thereof, and limits the extrapolation depth to the piston 51. Therefore, the correction work can be performed on all the rings 54 without limiting the extrapolation depth with respect to the piston 51 (the ring is corrected regardless of the distance from the piston end to the seal groove). Can be done).

  The ring mounting jig according to the above embodiment can be variously modified in structure within the technical scope of the present invention. Further, the parts to be mounted are not limited to the combination of the piston and the combination seal.

It is sectional drawing of the ring mounting jig which concerns on the Example of this invention, Comprising: Explanatory drawing which shows a ring mounting process in order of (A) (B) and (C) It is sectional drawing of the ring mounting jig which similarly concerns on the Example of this invention, Comprising: Explanatory drawing which shows a ring mounting process in order of (A) (B) and (C) (A) is principal part sectional drawing of the piston as an example of components for mounting, (B) is an expanded sectional view of the combination seal provided in the piston. It is sectional drawing of the ring mounting jig which concerns on a prior art example, Comprising: Explanatory drawing which shows a ring mounting process in order of (A) (B) and (C) Similarly, a cross-sectional view of a conventional ring mounting jig

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Slide jig 2 1st slide jig 3 Jig body 4 Slide surface 5 Jig holding part 6 Second slide jig 7 Ring holding part 7a Opening side front end part 8 Pull-out operation part 9, 25 Axial through hole 11 Push Jig 12 Tip pressing portion 21 Correction jig 22 Correction surface 23 Guide surface 24 Operation portion 51 Piston (mounting member)
51a End face 52 Mounting groove 53 Combination seal 54 Sliding ring (ring)
55 Buckling 56 Cylinder

Claims (3)

A mounting jig used when mounting a ring (54) such as a combination seal in an annular mounting groove (52) provided on an outer peripheral surface of a mounting member (51) such as a piston,
A slide jig (1) provided with a conical slide surface (4) that elastically expands the diameter while sliding the ring (54) in an axial direction, and a ring set on the slide jig (1) ( 54) and a pushing jig (11) that slides along the slide surface (4) by pressing,
The slide jig (1) has a second slide jig (6) in addition to the first slide jig (2) provided with the slide surface (4),
The second slide jig (6) is externally inserted into the mounting member (51) while holding the ring (54) whose diameter has been expanded by the first slide jig (2), and the mounting groove (52). The ring (54) is mounted in the mounting groove (52) by pressing the ring (54) in the vicinity and pulling out the second slide jig (6), and the mounting member extends over the entire axial length. A ring mounting jig having an inner diameter dimension larger than the outer diameter dimension of (51) and having a shape that does not limit an extrapolation depth with respect to the mounting member (51). In the ring mounting jig according to claim 1,
When the second slide jig (6) pulls out the ring holding part (7) that holds the ring (54) whose diameter has been expanded by the first slide jig (1), and the second slide jig (6) And a pulling operation portion (8) used for the ring mounting jig. In the ring mounting jig according to claim 1 or 2,
In addition to the slide jig (1) and the pushing jig (11), the ring mounting jig includes a correction jig (21 for correcting the outer diameter of the ring (54) mounted in the mounting groove (52). )
The correction jig (21) also has an inner diameter that is larger than the outer diameter of the mounting member (51) over the entire length in the axial direction, and the extrapolation depth with respect to the mounting member (51) is not limited. A ring mounting jig characterized by a shape.

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