JP2014211220A - Bearing mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing mounting structure capable of mounting a bearing in a state where a circlip is included on a rotor while reducing the dimension and weight of the rotor, and easily determining whether the circlip can be properly mounted or not.SOLUTION: A bearing mounting structure includes a rotor 1 having a first engagement recessed portion 1b on the inner peripheral face of a supporting shaft hole 1a, a bearing 5 having a second engagement recessed portion 7a on the outer peripheral face of an outer ring 7 so that the second engagement recessed portion 7a is opposed to the first engagement recessed portion 1b in a state of being mounted on the rotor 1, and a circlip 9 engaged in a state of being accommodated in a space defined by the first and second engagement recessed portions 1b, 7a. The rotor 1 is provided with a plurality of confirmation holes 1c extended along a rotation axis C from one end face to the other end face, and penetrated through the first engagement recessed portion 1b to confirm propriety of the engagement of the circlip 9 to the first and second engagement recessed portions 1b, 7a.

Description

  The present invention relates to a bearing mounting structure in which a bearing is mounted in a state where a bearing is press-fitted into a center shaft hole of a rotating body such as a gear, and more particularly to a bearing mounting structure in which a circlip is interposed between the rotating body and the bearing.

  FIG. 9 shows a conventional mounting structure of a bearing with respect to a gear. A gear 21 shown in the figure is, for example, an idle gear provided between a clutch case 22 constituting an outer shell of a clutch mounted on a vehicle and a transmission case 23 constituting an outer shell of a transmission. The idle gear 21 is rotatably supported via a bearing 25 by a bolt 24 as a support shaft inserted through a support shaft hole 21a in the center, and the bolt 24 is screwed into the clutch case 22. Yes.

  At one end of the idle gear 21 (the left end in FIG. 9), a ring-shaped bearing locking portion 26 that protrudes inwardly is smaller than the diameter of the support hole 21a. Yes. Further, the other end (the right end in FIG. 9) of the idle gear 21 has the same diameter as the support shaft hole 21a and protrudes outward (to the right in FIG. 9). A clip locking portion 27 is projected. The circlip engaging portion 27 is formed with a ring-shaped engaging recess 27a extending over the entire inner peripheral surface, and the circlip 28 is fixed to the engaging recess 27a. The circlip 28 has a ring shape having a predetermined diameter, and is formed of a C-shaped metal plate partly cut away. An outer peripheral portion of the circlip 28 is formed in a locking recess 27 a of the idle gear 21. While being fitted, the inner peripheral portion projects inward of the bearing mounting hole 21a.

  The bearing 25 is a double angular ball bearing, and includes an inner ring 25a and an outer ring 25b each having a predetermined diameter, and a plurality of balls 25c arranged in two rows along the circumferential direction therebetween. Have. The bearing 25 is press-fitted into the support shaft hole 21a of the idle gear 21. One end surface of the outer ring 25b abuts on the bearing locking portion 26 of the idle gear 21, and the other end surface of the outer ring 25b is circlip. It is attached to the idle gear 21 in a state where it abuts against the motor 28. Thereby, the bearing 25 is attached to the idle gear 21 in a state in which the idle gear 21 and the bearing 25 are prevented from moving relative to each other in the rotation axis direction. A bolt 24 is inserted into the inner ring 25a of the bearing 25 via a sleeve-like collar 29 having a flange at one end, and the inner ring 25a is fixed by the bolt 24 so as not to rotate.

  Further, as an attachment structure for attaching a bearing to a transmission case with a circlip interposed, a structure described in Patent Document 1, for example, is known. In this mounting structure, the transmission case has a support hole, and a ring-shaped engagement recess that extends along the circumferential direction of the support hole and engages the circlip is formed on the support hole. Is formed. Further, the mission case is provided with a tool insertion hole for inserting a predetermined tool in order to attach the circlip between the mission case and the bearing. On the other hand, the outer peripheral surface of the outer ring of the bearing is formed with a ring-shaped engaging recess that extends in the entire circumferential direction and engages with the circlip.

  When attaching a bearing to the above mission case, first, the circlip is engaged with the engagement recess of the support shaft hole on the mission case side, and the circlip is inserted by a tool inserted from the outside through the tool insertion hole, It is expanded so that its diameter increases against the restoring force of its springiness. As a result, the circlip is temporarily accommodated in the engagement recess of the support shaft hole on the mission case side. Next, the bearing is press-fitted into the support shaft hole of the transmission case. Then, when the tool is pulled out from the tool insertion hole of the transmission case and removed from the circlip, the circlip returns to its original state by the restoring force and engages with the engagement recess of the outer ring on the bearing side. Thus, the bearing is fixed to the support shaft hole of the transmission case with the circlip interposed.

Japanese Utility Model Publication No. 5-8117

  In the conventional bearing mounting structure shown in FIG. 9, in order to mount the bearing 25 to the idle gear 21, a bearing locking portion 26 and a circlip locking portion 27 are provided to protrude from both ends of the idle gear 21. There is a need to. For this reason, the peripheral part of the support shaft hole 21a becomes thicker in the rotation axis direction, and the idle gear 21 becomes larger in size in the rotation axis direction and heavy in weight. On the other hand, when the mounting structure of the bearing of Patent Document 1 is applied to mounting on a rotating body such as the idle gear 21 described above, a tool insertion hole for mounting a circlip needs to be formed on the rotating body. In this case, the strength of the rotating body may be reduced.

  The present invention was made in order to solve the above-described problems, and while attempting to reduce the size and weight of the rotating body, the bearing can be attached with the circlip interposed in the rotating body, It is another object of the present invention to provide a bearing mounting structure that can easily determine whether or not the circlip is appropriately provided.

  In order to achieve the above object, the invention according to claim 1 has a support hole 1a through which a support shaft (bolt 4 in the embodiment (hereinafter the same applies in this section)) is inserted in the center. A ring-shaped first engagement recess (gear-side engagement recess 1b) extending in the entire circumferential direction is formed at a predetermined position on the inner peripheral surface of the shaft hole, and is a rotator that is rotatably supported by a support shaft ( A ring-shaped second engagement recess (bearing side engagement) having an idle gear 1), an outer ring 7 and an inner ring 6 that are rotatable relative to each other, and extending over the entire circumferential direction at a predetermined position on the outer circumferential surface of the outer ring. In the state where the recess 7a) is formed and is press-fitted into the support hole, the second engagement recess faces the first engagement recess, the support shaft is inserted into the inner ring, and the inner ring Bearing 5 fixed to the spindle, and first and second A circlip for preventing relative movement of the rotating body and the bearing in the rotation axis direction by engaging with the first and second engaging recesses while being accommodated in the space defined by the joint recess. 9, and the rotating body extends along the rotation axis C from one end surface to the other end surface in the rotation axis direction of the rotating body at the peripheral edge portion of the support shaft hole, and the first engaging recess A plurality of confirmation holes (confirmation grooves 1c) for confirming whether or not the circlip is engaged with the first and second engagement recesses are formed.

  According to this configuration, the rotating body has the support hole through which the support shaft is inserted, and the ring extends to the predetermined position on the inner peripheral surface of the support shaft throughout the entire circumferential direction. A first engaging recess having a shape is formed. On the other hand, the bearing having the outer ring and the inner ring is formed with a ring-shaped second engaging recess extending in the entire circumferential direction at a predetermined position on the outer peripheral surface of the outer ring. In a state where the bearing is attached to the rotating body by press-fitting into the support hole, the second engaging recess on the bearing side faces the first engaging recess on the rotating body side. Then, the circlip is accommodated in the space defined by the first and second engaging recesses, and engages with both engaging recesses. Thus, the rotating body and the bearing are prevented from moving relative to each other in the rotation axis direction. Thus, according to the present invention, the circlip for preventing the relative movement of the rotating body and the bearing is provided between the inner peripheral surface of the support shaft hole of the rotating body and the outer peripheral surface of the outer ring of the bearing. Therefore, the thickness of the rotating body in the direction of the rotational axis is reduced compared to the case where the bearing locking portion and the circlip locking portion are provided at both ends in the rotational axis direction of the conventional idle gear described above. Can do. As a result, the size of the rotating body in the direction of the rotation axis can be reduced and the weight of the rotating body can be reduced as compared with the conventional case.

  Further, the rotating body has a plurality of confirmation holes formed in the peripheral edge portion of the central support hole, and each confirmation hole rotates from one end surface to the other end surface in the rotation axis direction of the rotating body. It extends along the axis and penetrates through the first engaging recess on the rotating body side. Then, using these confirmation holes, it is determined whether or not the circlip interposed between the rotating body and the bearing is engaged with the first and second engaging recesses. This determination can be made based on whether light is transmitted through each confirmation hole by, for example, irradiating light from one to the other in the rotation axis direction of the rotating body. That is, when light passes through each confirmation hole, the circlip is not engaged with the first engagement recess on the rotating body side, and therefore the circlip is engaged with the first and second engagement recesses. Determined to be inappropriate. On the other hand, when light does not pass through each confirmation hole, the circlip is engaged with the first engagement recess on the rotating body side, so that light introduced from one opening of the confirmation hole is blocked by the circlip. Therefore, it is determined that the circlip is appropriately engaged with the first and second engaging recesses. The circlip is usually formed in a C shape having a notch in a part of the ring shape. Since the rotating body is provided with a plurality of confirmation holes, if the notch part of the circlip matches one of the confirmation holes, even if light passes through the confirmation hole, other confirmation holes If it is confirmed that light does not pass through the hole, it is possible to determine that the circlip is appropriately engaged with the first and second engaging recesses. As described above, according to the present invention, it is possible to easily determine whether or not the circlip interposed between the rotating body and the bearing is appropriately provided using a plurality of confirmation holes.

  According to a second aspect of the present invention, in the bearing mounting structure according to the first aspect, the plurality of confirmation holes are arranged at predetermined angles with respect to the rotation axis, and are configured by at least three confirmation holes. It is characterized by that.

  According to this configuration, since the rotating body is provided with at least three confirmation holes arranged at predetermined angles with respect to the rotation axis, for example, the notch portion of the circlip is provided with the confirmation hole. Even if light passes through the confirmation hole by matching one of the first and second engagement recesses, it is confirmed whether or not light is transmitted through the other two or more confirmation holes. Appropriateness of the engagement of the circlip with respect to can be more reliably determined.

  According to a third aspect of the present invention, in the bearing mounting structure according to the first or second aspect, the rotating body is a gear having a large number of teeth on the outer peripheral surface.

  According to this configuration, unlike a conventional gear, the bearing as a rotating body is mounted with a circlip interposed without increasing the thickness in the rotation axis direction or reducing the strength. Can do.

  According to a fourth aspect of the present invention, in the bearing mounting structure according to the third aspect, the rotating body is an idle gear that meshes with a drive side gear and a driven side gear.

  In general, since the load applied to the idle gear is relatively small, the power of the driving gear is smoothly and stably transmitted to the driven gear by using the rotating body as such an idle gear. be able to. In general, a helical gear is used as a gear in a vehicle transmission. When these gears mesh with each other, a thrust load is generated in one direction of the rotation axis when rotating. For this reason, when an idle gear that meshes between both gears is arranged between two gears, a thrust load generated between one gear and the idle gear and between the other gear and the idle gear are generated. The thrust load acts in the opposite direction. Therefore, when the above idle gear is arranged so as to mesh between two helical gears, the thrust load generated between the two gears is canceled, and as a result, the thrust load on the circlip in the idle gear is canceled. The load can be reduced.

It is a figure which shows the state which applied the mounting structure of the bearing by one Embodiment of this invention to the idle gear of the transmission mounted in the vehicle, (a) is a longitudinal cross-sectional view, (b) is b- of (a). The state cut | disconnected along b line is shown. It is a figure which expands and shows a part of longitudinal cross-sectional view of the attachment part of an idle gear and a bearing. It is a figure for demonstrating the discrimination | determination method of the suitability of the mounting | wearing of the circlip interposed between an idle gear and a bearing, (a) is a state in which mounting | wearing of a circlip is inappropriate, (b) is mounting | wearing of a circlip. Indicates an appropriate state. It is a figure for demonstrating the state in which lubricating oil is introduce | transduced via a confirmation groove | channel. It is explanatory drawing for demonstrating the jig | tool at the time of attaching a bearing to an idle gear. It is explanatory drawing for demonstrating in order the procedure at the time of attaching a bearing to an idle gear using a jig | tool. It is a figure for demonstrating the modification of the confirmation groove | channel formed in an idle gear. It is another modification of the confirmation groove formed in the idle gear, and is a view for explaining the case of confirming whether or not the circlip is fitted using a confirmation insertion rod, and (a) is a confirmation insertion. Before insertion of the rod, (b) shows a state after insertion of the insertion rod for confirmation. It is a figure which shows the conventional attachment structure of the bearing with respect to a gear.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a state in which a bearing mounting structure according to an embodiment of the present invention is applied to an idle gear of a transmission mounted on a vehicle. As shown in FIG. 2A, the idle gear 1 is located between a clutch case 2 that constitutes an outer shell of a clutch mounted on a vehicle and a transmission case 3 that constitutes an outer shell of a transmission. A bolt 4 as a shaft is rotatably supported via a bearing 5, and the bolt 4 is screwed into the clutch case 2.

  As shown in FIGS. 1 and 2, the idle gear 1 is composed of a helical gear having a large number of teeth on the outer peripheral portion, and a support hole 1a having a predetermined diameter is formed at the center. On the inner peripheral surface of this support shaft hole 1a, a central portion in the thickness direction of the idle gear 1 (the left-right direction in FIGS. 1A and 2) extends over the entire circumferential direction and has a predetermined depth. And a ring-shaped gear-side engagement recess 1b (first engagement recess) with which a circlip 9 described later is engaged is formed.

  Further, the idle gear 1 has a plurality (three in this embodiment) of confirmation grooves 1c (confirmation holes) formed at the periphery of the support hole 1a. These confirmation grooves 1c are appropriately engaged with the gear-side engaging recess 1b and the bearing-side engaging recess 7a (to be described later) of the bearing 5 during assembly by mounting the bearing 5 and the circlip 9 to the idle gear 1. This is for confirming whether or not they match. The three confirmation grooves 1c are arranged at equal angles with respect to an axis passing through the center of the idle gear 1 (hereinafter referred to as “rotational axis C” as appropriate), and each of them is inward of the support shaft hole 1a. And extends from one end surface of the idle gear 1 to the other end surface along the rotation axis C and penetrates through the gear side engaging recess 1b.

  The bearing 5 is a double angular type ball bearing, and has an inner ring 6 and an outer ring 7 each having a predetermined diameter and rotatable relative to each other, and arranged in two rows along the circumferential direction between them. A plurality of balls 8. On the outer peripheral surface of the outer ring 7, the circlip 9 has a predetermined depth at the center in the thickness direction (left and right direction in FIGS. 1 (a) and 2) and extending over the entire circumferential direction. A ring-shaped bearing-side engagement recess 7a (second engagement recess) is formed.

  The circlip 9 is made of a relatively thin metal plate and is formed in a ring shape having a predetermined diameter. More specifically, as shown in FIG. 1 (b), the circlip 9 is formed in a C shape having a notch 9a having a predetermined length in a ring-shaped part, and the outer diameter is a gear. It is formed to be the same as or slightly larger than the maximum diameter of the side engagement recess 1b, and the inner diameter is smaller than the maximum diameter of the bearing side engagement recess 7a. As shown in FIG. 2, the circlip 9 has a radial width dimension (vertical dimension in the figure) larger than a depth of the gear-side engagement recess 1b (vertical dimension in the figure). The bearing-side engaging recess 7a is formed to have the same depth as the depth (the vertical dimension in the figure) or slightly smaller than that.

  The circlip 9 formed as described above is accommodated in a space defined by the gear-side engagement recess 1b of the idle gear 1 and the bearing-side engagement recess 7a of the bearing 7, Engages 1b and 7a. As a result, the idle gear 1 and the bearing 7 are prevented from moving relative to each other in the rotation axis direction.

  As described above, in the idle gear 1 in which the bearing 5 is attached with the circlip 9 interposed, as shown in FIG. 1A, the inner ring 6 of the bearing 5 has a sleeve-like shape having a flange at one end. The bolt 4 is inserted through the collar 10, and the inner ring 6 is fixed by the bolt 4 so as not to rotate. The idle gear 1 meshes with a driving gear and a driven gear (not shown), so that the power of the driving gear can be smoothly and stably transmitted to the driven gear. In addition, the driving and driven gears that mesh with the idle gear 1 that is a helical gear are also helical gears. As described above, the thrust load generated between the two gears during rotation is offset, so that the thrust load on the circlip 9 is offset. Can be reduced.

  Here, with reference to FIG. 3, a method for determining whether or not the circlip 9 interposed between the idle gear 1 and the bearing 5 is appropriate will be described. This determination is made by irradiating light L from one side of the rotation axis direction to the other side (left side to right side in FIG. 3) of the idle gear 1 to which the bearing 5 is attached. This is performed based on whether or not light L is transmitted.

  For example, as shown in FIG. 3A, when the bearing-side engagement recess 7a of the bearing 5 does not match the gear-side engagement recess 1b of the idle gear 1, or both the engagement recesses 1b and 7a match. Even if the circlip 9 is caught between the inner peripheral surface of the support shaft hole 1a of the idle gear 1 and the outer peripheral surface of the outer ring 7 of the bearing 5, the circlip 9 It does not properly engage with the mating recess 1b. For this reason, as shown in FIG. 5A, the light L passes through the confirmation groove 1c. Therefore, in this case, the circlip 9 is engaged with the gear side engaging recess 1b and the bearing side engaging recess 7a. Is determined to be inappropriate.

  On the other hand, as shown in FIG. 3B, the bearing-side engaging recess 7a of the bearing 5 matches the gear-side engaging recess 1b of the idle gear 1, and the circlip 9 is engaged with both the engaging recesses 1b and 7a. In the case of matching, the light L introduced into the confirmation groove 1 c is blocked by the circlip 9. Therefore, in this case, it is determined that the circlip 9 is appropriately engaged with the gear side engaging recess 1b and the bearing side engaging recess 7a.

  The presence / absence of the transmission of the light L can be detected automatically by an operator, for example, using a predetermined detection device installed on the assembly line.

  Further, as described above, in the idle gear 1 to which the bearing 5 is attached with the circlip 9 interposed, as shown by the white arrow in FIG. 4, the lubricating oil is passed through each confirmation groove 1c. It can be introduced between the idle gear 1 and the bearing 5. As a result, fretting wear that tends to occur between the inner peripheral surface of the support shaft hole 1a and the outer peripheral surface of the outer ring 7 of the bearing 5 press-fitted into the support shaft hole 1a as the idle gear 1 is used. Can be prevented.

  Next, a method for attaching the bearing 5 to the idle gear 1 will be described with reference to FIGS. 5 and 6. FIG. 5A shows a state before a predetermined jig 12 is set on the idle gear 1 and the bearing 5 is attached. As shown in FIG. 5A, the jig 12 is formed in a block shape having a predetermined thickness, and has a guide hole 12 a for guiding the bearing 5 to the support shaft hole 1 a of the idle gear 1. Have. The guide hole 12 has a circular cross section, and the diameter of the end portion on the opposite side to the idle gear 1 (the upper end portion in FIG. 5A) is larger than the maximum diameter of the bearing 5. The diameter of the end (the lower end in the figure) is tapered toward the idle gear 1 so that the maximum diameter of the bearing 5 and the spindle hole 1a of the idle gear 1 are the same. Further, at the end of the jig 12 on the idle gear 1 side, there are a plurality of guide convex portions 12 b that protrude slightly downward from the peripheral portion of the guide hole 12 and can be inserted into the plurality of confirmation grooves 1 c of the idle gear 1. Projected.

  Using the jig 12 configured as described above, as shown in FIG. 5A, first, each guide convex portion 12 b of the jig 12 is set so as to be inserted into the confirmation groove 1 c of the idle gear 1. . In this case, as shown in the figure, a circlip 9 is previously attached to the outer ring 7 of the bearing 5 via a bearing-side engaging recess 7a. In this case, the circlip 9 has its inner peripheral edge engaged with the bearing-side engaging recess 7 a of the bearing 5, and the outer peripheral edge protruded in the radial direction from the outer ring 7.

  Next, as shown in FIG. 6A, the bearing 5 to which the circlip 9 is attached is inserted into the guide hole 12 a of the jig 12. As a result, the circlip 9 comes into contact with the inner peripheral surface of the guide hole 12 a of the jig 12. From this state, when the bearing 5 is pressed toward the idle gear 1 and moved, the diameter of the circlip 9 is reduced against the spring property by the tapered inner peripheral surface of the guide hole 12a. As shown in b), the entire circlip 9 is accommodated in the bearing side engaging recess 7a. When the bearing 5 is further pressed toward the idle gear 1 and is press-fitted into the support shaft hole 1a, the bearing-side engagement recess 7a is aligned with the gear-side engagement recess 1b of the idle gear 1, and the circlip 9 The diameter of the circlip 9 expands due to the restoring force due to the spring property, and as shown in FIG. 6C, the circlip 9 is in addition to the bearing-side engagement recess 7a, and the gear-side engagement recess 1b of the idle gear 1 Also engages.

  Thereafter, the jig 12 is removed from the idle gear 1, and whether or not the circlip 9 is attached is determined as described above. When it is determined that the circlip 9 is properly engaged with the gear-side engagement recess 1b and the bearing-side engagement recess 7a, assembly by attaching the bearing 5 and the circlip 9 to the idle gear 1 is performed. Is completed.

  As described above, according to the present embodiment, the circlip 9 is interposed between the inner peripheral surface of the support shaft hole 1 a of the idle gear 1 and the outer peripheral surface of the outer ring 7 of the bearing 5. Compared with the conventional bearing mounting structure for the idle gear, the thickness of the idle gear 1 in the rotation axis direction can be reduced. As a result, it is possible to reduce the size of the idle gear 1 in the rotational axis direction and to reduce the weight of the idle gear 1 as compared with the conventional case. Further, it is possible to easily determine whether or not the circlip 9 interposed between the idle gear 1 and the bearing 5 is appropriately provided by using the plurality of confirmation grooves 1c provided in the idle gear 1. it can.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment described. For example, in the embodiment, the case where the bearing 5 is attached to the idle gear 1 as the rotating body of the present invention has been described. However, the present invention is not limited to this, and the rotating body may be a gear other than the idle gear, Of course, it can also be applied to pulleys.

  Further, in the embodiment, each confirmation groove 1c provided in the idle gear 1 is formed in a groove shape opening inward of the support shaft hole 1a. However, any confirmation groove 1c may be used as long as it penetrates the gear side engagement recess 1b. Therefore, for example, as shown in FIG. 7, the confirmation groove 1c can be formed in a hole shape.

  Further, when it is difficult to penetrate the confirmation groove 1c over the entire rotation axis direction of the idle gear 1 or due to the shape or size of the circlip 9, the circlip 9 is mounted by irradiation with the light L described above. For example, as shown in FIG. 8A, a confirmation hole 1d that reaches the gear-side engagement recess 1b from the outside may be formed as shown in FIG. In this case, as shown in FIG. 8 (b), a predetermined insertion rod 13 for insertion is inserted into the confirmation hole 1, and the insertion stroke of the insertion rod 13 for confirmation when contacting the circlip 9 The suitability of the clip 9 can be determined.

  Further, the detailed configurations of the idle gear 1, the bearing 5, and the circlip 9 shown in the embodiment are merely examples, and can be appropriately changed within the scope of the gist of the present invention.

1 Idle gear (rotating body)
1a Spindle hole 1b Gear side engagement recess (first engagement recess)
1c Confirmation groove (confirmation hole)
4 bolts (support shaft)
5 Bearing 6 Inner ring of bearing 7 Outer ring of bearing 7a Bearing side engaging recess (second engaging recess)
9 Circlip C Rotation axis

Claims (4)

There is a support hole through which the support shaft is inserted in the center, and a ring-shaped first engagement recess extending in the entire circumferential direction is formed at a predetermined position on the inner peripheral surface of the support shaft hole. A rotating body rotatably supported by a shaft;
A ring-shaped second engaging recess extending over the entire circumferential direction is formed at a predetermined position on the outer peripheral surface of the outer ring, and is relatively press-fitted into the support shaft hole. In this state, the second engaging recess faces the first engaging recess in a state where the rotating ring is attached to the rotating body, the support shaft is inserted into the inner ring, and the inner ring is fixed to the support shaft. Bearings,
By engaging with the first and second engaging recesses in a state of being accommodated in the space defined by the first and second engaging recesses, relative rotation of the rotating body and the bearing in the rotation axis direction is achieved. Circlip to prevent general movement,
With
The rotating body extends along the rotation axis from one end surface to the other end surface in the rotation axis direction of the rotating body at a peripheral edge portion of the support shaft hole, and includes the first engaging recess. A bearing mounting structure characterized in that a plurality of confirmation holes are formed to pass through and confirm whether or not the circlip is engaged with the first and second engaging recesses.   2. The bearing mounting structure according to claim 1, wherein the plurality of confirmation holes are arranged at predetermined angles with respect to the rotation axis and are configured by at least three confirmation holes.   The bearing mounting structure according to claim 1, wherein the rotating body is a gear having a large number of teeth on an outer peripheral surface.   The bearing mounting structure according to claim 3, wherein the rotating body is an idle gear that meshes with a driving gear and a driven gear.

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