Power transmission mechanism and oil seal holding member

Abstract

To appropriately perform exchange work for an oil seal.SOLUTION: A speed reducer comprises: a worm shaft (2); a speed reducer case (10) that supports the worm shaft via a bearing (6), and into which a worm shaft is inserted; an oil seal holding member (3) that is mounted between the worm shaft and the speed reducer case, and replaceably holds an oil seal (4); and a shim (7) for adjusting a position of the worm shaft, which is arranged between the oil seal holding member and the bearing (6) fixed to the worm shaft. The oil seal holding member comprises: an outside member (31) that is mounted on the speed reducer case, and holds the shim; and an inside member (32) that is located inside the outside member in a radial direction of the worm shaft, holds the oil seal, and is detachably mounted to the outside member.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a power transmission mechanism and an oil seal retaining member. [Background technology]

[0002] In power transmission mechanisms such as gear reducers, a lubricant is sealed inside a housing that houses internal components, including gears, to reduce friction and provide cooling. Such lubricant must not leak outside the housing. Therefore, an oil seal has traditionally been provided at the portion of the housing through which the rotating shaft passes to prevent the lubricant from leaking outside.

[0003] Oil seals are replaceable parts whose functionality deteriorates over time due to various factors such as wear, heat, aging, etc. Conventionally, a configuration has been known in which an oil seal retaining member (housing, seal unit) that retains a replaceable oil seal is attached to a housing (reduction gear case) (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-180944 Summary of the Invention [Problem to be solved by the invention]

[0005] Fig. 5 is a vertical cross-sectional view of a conventional reducer. Fig. 6 is an enlarged view of part B in Fig. 5. As shown in Figs. 5 and 6, in a conventional reducer 100, an oil seal holding member 103 is attached between a reducer case 101, which is a housing, and a worm shaft 102, which is an input shaft (rotating shaft). The oil seal holding member 103 holds a replaceable oil seal 104.

[0006] The oil seal retaining member 103 is inserted from the outside to the inside of the speed reducer case 101 and fixed to the speed reducer case 101 with bolts 109. The oil seal 104 contacts the worm shaft 102 to prevent the leakage of the lubricant enclosed in the speed reducer case 101 to the outside. A silicon bond (not shown) is applied to the gap between the oil seal retaining member 103 and the speed reducer case 101 to prevent the leakage of the lubricant from the gap.

[0007] The speed reducer case 101 supports the worm shaft 102 and the worm wheel 105. An output shaft 108 is connected to the worm wheel 105, and the gear portions of the worm shaft 102 and the worm wheel 105 mesh and slide in contact with each other to transmit power.

[0008] A shim 107 for backlash adjustment is arranged between the bearing 106 attached to the worm shaft 102 and the oil seal retaining member 103. By arranging a shim 107 with an appropriate thickness to make the thrust play of the meshing of the gear portion extremely close to zero, smooth sliding contact can be realized.

[0009] Also, as shown in FIG. 6, the oil seal retaining member 103 also has a function of pressing the shim 107 arranged between it and the bearing 106.

[0010] In the conventional speed reducer 100, when replacing the oil seal 104, the bolts 109 are removed and the oil seal retaining member 103 together with the speed reducer case 101 is removed. After replacing the oil seal 104, the oil seal retaining member 103 is attached to the speed reducer case 101 again and fixed with bolts 109.

[0011] However, in the prior art as described above, there is a problem that the replacement work of the oil seal 104 cannot be properly performed.

[0012] That is, when replacing the oil seal 104, since the oil seal 104 is removed together with the oil seal holding member 103, the shim 107 that has been pressing may come off together with the oil seal holding member 103 at that time. The thickness of the shim 107 is extremely thin, and there may be cases where a plurality of shims with different thicknesses are combined and arranged. If the shim comes off during the operation, it will lead to the loss of the shim.

[0013] In addition, silicon bond easily adheres to the shim. If the silicon bond remains attached to the removed shim and is reassembled, the adjusted dimension will be distorted. Therefore, when silicon bond adheres to the shim, it is necessary to perform a time-consuming operation such as wiping off the silicon bond. As a result, in the prior art, the replacement work time of the oil seal 104 becomes long.

[0014] One aspect of the present invention aims to realize a power transmission mechanism or the like that can appropriately perform the replacement work of the oil seal.

Means for Solving the Problems

[0015] In order to solve the above problems, a power transmission mechanism according to Aspect 1 of the present invention includes a rotating shaft, a housing that supports the rotating shaft by a bearing member and through which the rotating shaft is inserted, an oil seal holding member that is mounted between the rotating shaft and the housing and holds an oil seal replaceably around the rotating shaft, and a shim for adjusting the position of the rotating shaft, which is disposed between the oil seal holding member and the bearing member. The oil seal holding member includes an outer member that is mounted on the housing and presses the shim, and an inner member that is located inside the outer member in the radial direction of the rotating shaft, holds the oil seal, and is detachably mounted on the outer member.

[0016] According to the above configuration, when replacing the oil seal, it is only necessary to remove the inner member from the outer member, and it is not necessary to remove the entire oil seal holding member. Therefore, the shim remains pressed by the outer member mounted on the housing, and the shim will not come off. Therefore, the loss of the shim can be prevented.

[0017] Also, since the shim does not come off, even if a silicon bond is used for sealing the gap, there is no need to wipe off the silicon bond from the shim. As a result, the oil seal replacement work can be properly performed.

[0018] In the power transmission mechanism according to Embodiment 2 of the present invention, in Embodiment 1, the outer member may have a first end face facing the side opposite to the housing side, and the inner member may have a second end face against which the first end face abuts in a state of being attached to the outer member.

[0019] In the power transmission mechanism according to Embodiment 3 of the present invention, in Embodiment 1, the outer member has a first end face facing the side opposite to the housing side, the inner member has a second end face facing the first end face in a state of being attached to the outer member, and one or more spacers disposed between the first end face and the second end face may be provided.

[0020] According to the above configuration, by disposing one or more spacers between the first end face and the second end face, the contact position of the oil seal with respect to the input shaft can be shifted. Therefore, even if streak wear occurs on the input shaft, it is possible to take measures such as shifting the position where the oil seal contacts to a position where streak wear has not occurred by disposing a spacer. As a result, the life of the oil seal can be extended, and the oil seal replacement work can be more appropriately performed.

[0021] In the power transmission mechanism according to Embodiment 4 of the present invention, in any one of Embodiments 1 to 3, an O-ring for sealing between the inner peripheral surface of the outer member and the outer peripheral surface of the inner member may be provided.

[0022] According to the above configuration, since the sealing of the gap is ensured by the O-ring, the silicon bond can be dispensed with. Therefore, when reassembling the inner member that has been once removed for the replacement of the oil seal, the work of wiping off the silicon bond from the inner member becomes unnecessary. Further, since the silicon bond is not used, it is possible to prevent the leakage of the lubricant due to the silicon bond biting into the oil seal. As a result, the oil seal replacement work can be performed more appropriately.

[0023] In order to solve the above problems, an oil seal holding member according to Embodiment 5 of the present invention is an oil seal holding member that is mounted between a housing and a rotating shaft inserted through the housing, has an oil seal, and holds the oil seal in a replaceable manner, and is divided in the radial direction of the rotating shaft, and includes an outer member that is located on the outer side in the radial direction and is mounted on the housing, and an inner member that is located on the inner side in the radial direction, holds the oil seal, and is detachably mounted on the outer member.

[0024] According to the above configuration, when replacing the oil seal, it is only necessary to remove the inner member from the outer member, and it is not necessary to remove the entire oil seal holding member. Therefore, when a shim is disposed between the bearing member of the rotating shaft and the oil seal holding member, the shim can be prevented from coming off by pressing the shim with the outer member mounted on the housing. Therefore, the loss of the shim can be prevented.

[0025] Further, since the shim does not come off, even if a silicon bond is used, the work of wiping off the silicon bond from the shim is not necessary. As a result, the oil seal replacement work can be performed appropriately.

[0026] The oil seal holding member according to Embodiment 6 of the present invention may, in Embodiment 5, include the outer member having a first end face facing the side opposite to the housing side, the inner member having a second end face facing the first end face in a state of being mounted on the outer member, and one or more spacers disposed between the first end face and the second end face.

[0027] According to the above configuration, by arranging one or more spacers between the first end face and the second end face, the contact position of the oil seal with respect to the rotating shaft can be shifted. Therefore, even if streak wear occurs on the rotating shaft, it is possible to take measures such as arranging a spacer to shift the position where the oil seal contacts to a position where streak wear has not occurred. As a result, the life of the oil seal can be extended, and furthermore, the replacement work of the oil seal can be appropriately performed.

Effect of the Invention

[0028] According to one aspect of the present invention, it is possible to realize a power transmission mechanism or the like that can appropriately perform the replacement work of the oil seal.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0030] 〔Embodiment 1〕 Hereinafter, an embodiment of the present invention will be described in detail. In this embodiment, a gear type speed reducer is exemplified as the power transmission mechanism. The power transmission mechanism is a mechanism or device that converts the rotational power from the input shaft into the required number of rotations or rotational torque by internal components including gears and transmits it to the output shaft.

[0031] FIG. 1 is a longitudinal sectional view of the speed reducer 1 of the present embodiment. FIG. 2 is an enlarged view of part A in FIG. 1. As shown in FIG. 1, the speed reducer 1 of the present embodiment includes a speed reducer case 10 which is a housing. A worm wheel 5 is accommodated in the speed reducer case 10, and a worm shaft 2 which is an input shaft (rotating shaft) is disposed through the speed reducer case 10. The speed reducer case 10 is a housing that supports the worm shaft 2 and the worm wheel 5. Bearings (bearing members) 6 are integrally attached to both ends of the worm shaft 2. The worm shaft 2 is supported by the speed reducer case 10 via the bearings 6. An output shaft 8 is connected to the worm wheel 5. The speed reducer case 10 supports the worm shaft 2 by the bearings 6.

[0032] The worm shaft 2 and the worm wheel 5 mesh with the gear portions of the worm shaft 2 and the worm wheel 5 and perform power transmission by sliding contact. The worm shaft 2 and the worm wheel 5 correspond to internal components including gears. A lubricant is enclosed in the speed reducer case 10 to reduce friction of the internal components and for cooling.

[0033] An oil seal holding member 3 is attached between the worm shaft 2 and the speed reducer case 10. The oil seal holding member 3 holds the oil seal 4 in a replaceable manner. One end of the worm shaft 2 is the input side where the motor is attached, and the other end is the anti-input side. The oil seal holding member 3 is provided on both the input side and the anti-input side.

[0034] The oil seal holding member 3 is fitted from the outside to the inside of the speed reducer case 10 and fixed to the speed reducer case 10 with bolts 21. The oil seal 4 contacts the worm shaft 2 to prevent leakage of the lubricant enclosed in the speed reducer case 10 to the outside.

[0035] A shim 7 for adjusting the position of the worm shaft 2 is disposed between the oil seal holding member 3 and the bearing 6. More specifically, the shim 7 is a backlash adjusting shim 7 for adjusting the meshing of the gear portions of the worm shaft 2 and the worm wheel 5. Through the shim adjustment described later, a shim 7 of an appropriate thickness is disposed to make the thrust play of the meshing of the gear portions extremely close to zero. Thereby, smooth sliding contact can be realized. The shims 7 are disposed at both ends (input side and anti-input side) of the worm shaft 2.

[0036] The input side and the anti-input side of the worm shaft 2 have different diameters of the oil seal holding member 3 according to the difference in the thickness of the worm shaft 2, but have the same structure except for the diameter. Therefore, for the sake of convenience of explanation, with reference to FIG. 2, the oil seal holding member 3 and the sealing structure around the worm shaft 2 using the oil seal holding member 3 will be described. FIG. 2 corresponds to the anti-input side of the worm shaft 2.

[0037] As shown in FIG. 2, the oil seal holding member 3 is divided in the radial direction of the worm shaft 2, and includes an outer member 31 located on the outer side in the radial direction and an inner member 32 located on the inner side in the radial direction. X in the figure represents the axis of the worm shaft 2.

[0038] The outer member 31 is attached to the speed reducer case 10 and presses the above-described shim 7. Specifically, it is fixed to the speed reducer case 10 using the bolt 21 described above.

[0039] The inner member 32 is located inside the outer member 31 in the radial direction of the worm shaft, holds the oil seal 4, and is detachably attached to the outer member. The inner member 32 holds the oil seal 4 in a replaceable manner.

[0040] With such a configuration, when replacing the oil seal 4, it is only necessary to remove the inner member 32 from the outer member 31, and it is not necessary to remove the entire oil seal holding member 3. Therefore, since the shim 7 remains pressed by the outer member 31 attached (fixed) to the speed reducer case 10, it will not come off. Accordingly, loss of the shim 7 can be prevented.

[0041] Also, since the shim 7 does not come off, even if a silicon bond is used for sealing the gap, the silicon bond will not adhere to the shim 7, and there is no need to wipe off the silicon bond from the shim 7. Thereby, the replacement work of the oil seal can be appropriately performed.

[0042] Specifically, the outer member 31 has a cylindrical portion 31a that is fitted into a circular through-hole 10a formed in the speed reducer case 10. At one end of the cylindrical portion 31a on the side opposite to the speed reducer case 10 side in a state of being fitted into the through-hole 10a, a first flange portion 31b extending radially outward is formed. The outer member 31 is fixed to the speed reducer case 10 using bolts 21 at the first flange portion 31b with the first flange portion 31b abutted against the outer surface of the speed reducer case 10.

[0043] At the other end of the cylindrical portion 31a on the speed reducer case 10 side in a state of being fitted into the through-hole 10a, an annular rib 31c that abuts against the aforementioned shim 7 and presses the shim 7 is formed.

[0044] On the inner peripheral side of the first flange portion 31b, a step portion 31d for fixing (attaching) the inner member 32 is formed. A first end face 31da facing the side opposite to the speed reducer case 10 side is formed on the step portion 31d. The first end face 31da is a face facing the second end face 32ba of the attached inner member 32. The first end face 31da is a face that abuts against the second end face 32ba in a state where the spacer 33 is not disposed. The first end face 31da is formed so as to extend radially inward from the inner peripheral surface of the first flange portion 31b.

[0045] The inner member 32 has an annular portion 32a that is fitted inside the cylindrical portion 31a of the outer member 31. The worm shaft 2 passes through (penetrates) the inside of the annular portion 32a. An oil seal 4 is held at one end portion on the side opposite to the speed reducer case 10 side inside the annular portion 32a in a state of being fitted into the outer member 31.

[0046] Furthermore, a second flange portion 32b that extends radially outward from the outer peripheral surface of the annular portion 32a is formed at the end portion of the annular portion 32a that holds the oil seal 4. The inner member 32 is fixed to the outer member 31 with bolts 22 at the second flange portion 32b in a state where the second flange portion 32b abuts against the first end surface 31da of the stepped portion 31d of the outer member 31, or in a state where a spacer 33 is disposed therebetween.

[0047] A second end surface 32ba facing the speed reducer case 10 side is formed on the second flange portion 32b. The second end surface 32ba is a surface that faces the first end surface 31da of the outer member 31. The second end surface 32ba is a surface that abuts against the first end surface 31da in a state where the spacer 33 is not disposed. The second end surface 32ba is formed so as to extend radially outward from the outer peripheral surface of the annular portion 32a.

[0048] As shown in FIG. 2, in the speed reducer 1 of the present embodiment, one or more spacers 33 can be disposed between the first end surface 31da of the outer member 31 and the second end surface 32ba of the inner member 32. In other words, the speed reducer 1 of the present embodiment is configured to include one or more spacers 33 disposed between the first end surface 31da of the outer member 31 and the second end surface 32ba of the inner member 32.

[0049] The spacer 33 is an annular thin plate-like member that is fitted into the stepped portion 31d of the outer member 31. The thickness of the spacer 33 can be, for example, 1.6 mm. The spacer 33 is sandwiched between the first end surface 31da and the second end surface 32ba and is fixed to the outer member 31 together with the inner member 32 with bolts 22.

[0050] By interposing a spacer 33 between the first end face 31da and the second end face 32ba, the position of the oil seal 4 with respect to the worm shaft 2 is displaced in a direction away from the bearing 6 by the thickness of the spacer 33 (here, 1.6 mm).

[0051] The rubber of the lip portion that contacts the worm shaft 2 in the oil seal 4 wears due to contact with the worm shaft 2. Also, streak wear occurs on the surface of the worm shaft 2 where the lip portion contacts. Even if the oil seal 4 is replaced with a new one, the wear of the lip portion is promoted by contacting the surface where streak wear has occurred, shortening the lifespan.

[0052] On the other hand, as in this embodiment, by having a configuration in which the spacer 33 can be arranged, it can be used initially without arranging the spacer 33. When streak wear occurs on the worm shaft 2, it becomes possible to take measures such as arranging one spacer 33 to shift the position where the lip portion hits to a position where streak wear has not occurred.

[0053] Thereby, it is possible to avoid a situation where the wear of the lip portion is promoted by the lip portion contacting the streak wear of the worm shaft 2, and extend the lifespan of the oil seal 4. As a result, the replacement work of the oil seal can be carried out more appropriately. The number of spacers 33 is not limited to one, and two, three, etc. can be appropriately added when streak wear occurs.

[0054] Furthermore, as shown in FIG. 2, in this embodiment, an O-ring 35 is provided for sealing between the inner peripheral surface of the outer member 31 and the outer peripheral surface of the inner member 32. The inner peripheral surface of the outer member 31 is the inner surface of the cylindrical portion 31a, and the outer peripheral surface of the inner member 32 is the outer surface of the annular portion 32a. The O-ring 35 seals the gap between the inner surface of the cylindrical portion 31a and the outer surface of the annular portion 32a.

[0055] In the example of FIG. 2, a groove 32aa for attaching an O-ring 35 is formed on the outer surface of the annular portion 32a of the inner member 32, and the O-ring 35 is fitted into this groove 32aa. A groove for attaching the O-ring 35 may be formed on the inner surface of the cylindrical portion 31a, and the O-ring 35 may be fitted therein.

[0056] Incidentally, in the configuration in which the oil seal holding member 3 is divided into the outer member 31 and the inner member 32, it is not essential to seal the space between the inner surface of the cylindrical portion 31a and the outer surface of the annular portion 32a with the O-ring 35. That is, a silicon bond may be applied between the inner surface of the cylindrical portion 31a and the outer surface of the annular portion 32a to seal the gap.

[0057] However, when using a silicon bond, when the inner member 32 is once removed and reassembled, it is necessary to wipe off the silicon bond from the outer peripheral surface of the inner member 32 and the inner peripheral surface of the outer member 31. Therefore, the replacement work time of the oil seal 4 cannot be shortened accordingly. Also, there is a risk of leakage of the lubricant due to the silicon bond biting into the lip portion of the oil seal 4 (foreign matter intrusion).

[0058] On the other hand, like the speed reducer 1 of the present embodiment, by adopting a configuration in which the gap between the inner surface of the cylindrical portion 31a and the outer surface of the annular portion 32a is sealed with the O-ring 35, when the inner member 32 is reassembled, the work of wiping off the silicon bond from the inner member 32 becomes unnecessary. Also, since no silicon bond is used, leakage of the lubricant due to the silicon bond biting into the lip portion of the oil seal 4 can be prevented. Thereby, the replacement work of the oil seal 4 can be carried out more appropriately.

[0059] FIG. 3 is a front view of the inner member 32 as viewed from the direction of arrow C shown in FIG. 2. As shown in FIG. 3, in the present embodiment, for example, two tapping holes 36 are provided in the inner member 32. By providing the tapping holes 36, a bolt can be inserted into the tapping holes 36, and the inner member 32 can be easily removed from the outer member 31. By aligning the size of the tapping holes 36 with the size of the bolt 22 removed for removing the inner member 32, the removed bolt 22 can be used as it is, and the workability is further improved.

[0060] FIG. 4 is a longitudinal sectional view of a main part showing a configuration in which a fan 40 and a fan cover 41 are attached to the anti-input side of the worm shaft 2 of the speed reducer 1. As shown in FIG. 4, a fan 40 is attached to an end of the worm shaft 2 on the side not connected to the motor, and a fan cover 41 following the fan 40 is attached.

[0061] In such a configuration, when the worm shaft 2 rotates, the fan 40 rotates to generate wind, and the wind can cool the periphery of the part where the oil seal holding member 3 including the speed reducer case 10 is mounted. In addition to the wear of the lip portion described above, the cause of the deterioration of the oil seal 4 is the deterioration of the rubber due to heat. By cooling by applying such wind, the deterioration of the oil seal 4 due to heat can also be suppressed, and the life can be further extended.

[0062] In the above embodiment, the oil seal holding member 3 mounted between the worm shaft 2 of the speed reducer 1 and the speed reducer case 10 is exemplified, but the oil seal holding member 3 may be configured to be mounted between a rotating shaft and a case through which the rotating shaft is inserted.

[0063] Even in such a case, when replacing the oil seal, it is only necessary to remove the inner member 32 from the outer member 31, and it is not necessary to remove the entire oil seal holding member 3. Therefore, for example, when a shim for adjusting the position of the rotating shaft is arranged between the bearing of the rotating shaft and the oil seal holding member 3, the shim remains pressed by the outer member 31 attached to the housing, so that the shim can be prevented from coming off. Therefore, the loss of the shim can be prevented.

[0064] Also, since the shim does not come off, even if a silicon bond is used, there is no need to wipe off the silicon bond from the shim. Thereby, the work of replacing the oil seal can be appropriately performed.

[0065] Further, by making it possible to arrange the spacer 33 between the first end face 31da of the outer member 31 and the second end face 32ba of the inner member 32, the contact position between the rotating shaft and the oil seal 4 can be shifted, and wear of the oil seal 4 due to streak wear generated on the rotating shaft can be prevented (suppressed). Thereby, the work of replacing the oil seal can be more appropriately performed.

[0066] <Purpose of Shim Adjustment> When the meshing of the gear portion that performs power transmission by sliding contact deteriorates, problems such as insufficient transmission capacity and abnormal noise due to a decrease in the surface pressure of the gear portion are likely to occur. In particular, when the worm shaft is drum-shaped, due to the meshing of the tooth portions with multiple teeth and the use of a bearing with a steep gradient, a severe tooth contact adjustment is required.

[0067] <How to Perform Shim Adjustment> The worm shaft 2 with the bearing 6 press-fitted and the worm wheel 5 are placed in the speed reducer case 10 for temporary assembly. The oil seal holding member 3 is temporarily tightened with bolts 21, and the thrust clearance is measured using a dial gauge. A shim 7 is inserted between the bearing 6 and the oil seal holding member 3 (in a state where the inner member 32 is attached to the outer member 31), and adjustment is made so that the thrust play is within 0 to 0.03 mm.

[0068] Tooth contact is also important. Apply cinnabar (red lead) to the worm shaft 2 and the worm wheel 5 to adjust the optimal tooth contact position. The shim 7 is adjusted by putting an appropriate amount on the input side and the non-input side of the worm shaft 2 so as to achieve the optimal tooth contact position. As an example, the shim 7 has four types of combinations with thicknesses of 0.20 mm, 0.15 mm, 0.10 mm, and 0.07 mm, and is adjusted so that the thrust play becomes 0 to 0.03 mm.

[0069] Temporarily assemble to determine the shim amount and the optimal tooth contact position, disassemble again, and then perform the final assembly. Apply a silicon bond between the outer member 31 of the oil seal retaining member 3 and the speed reducer case 10 for the purpose of preventing leakage of the lubricant, and fix the outer member 31 of the oil seal retaining member 3 and the speed reducer case 10 with bolts 21.

[0070] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

Explanation of Reference Numerals

[0071] 1 Speed reducer (power transmission mechanism) 2 Worm shaft (rotating shaft) 3 Oil seal retaining member 4 Oil seal 6 Bearing (bearing member) 7 Shim 10 Speed reducer case (housing) 31 Outer member 32 Inner member 31a Cylindrical portion 31da First end face 32ba Second end face 33 Spacer 35 O-ring

Claims

1. A rotating shaft, a housing that supports the rotating shaft by a bearing member and through which the rotating shaft is inserted, an oil seal holding member that is mounted between the rotating shaft and the housing and holds an oil seal so as to be replaceable around the rotating shaft, a shim for adjusting the position of the rotating shaft, which is disposed between the oil seal holding member and the bearing member, and the oil seal holding member includes an outer member that is mounted on the housing and presses the shim, and an inner member that is located inside the outer member in the radial direction of the rotating shaft, holds the oil seal, and is detachably mounted on the outer member. A power transmission mechanism.

2. The outer member has a first end face facing the side opposite to the housing side, The power transmission mechanism according to claim 1, wherein the inner member has a second end face against which the first end face abuts when the inner member is mounted on the outer member.

3. The outer member has a first end face facing the side opposite to the housing side, The inner member has a second end face facing the first end face when the inner member is mounted on the outer member, The power transmission mechanism according to claim 1, further comprising one or more spacers disposed between the first end face and the second end face.

4. The power transmission mechanism according to any one of claims 1 to 3, further comprising an O-ring that seals between the inner peripheral surface of the outer member and the outer peripheral surface of the inner member.

5. An oil seal holding member that is mounted between a housing and a rotating shaft inserted through the housing and has an oil seal and holds the oil seal so as to be replaceable, which is divided in the radial direction of the rotating shaft, an outer member that is located on the outer side in the radial direction and is mounted on the housing, and an inner member that is located on the inner side in the radial direction, holds the oil seal, and is detachably mounted on the outer member. An oil seal holding member.

6. The outer member has a first end face facing the side opposite to the housing side, The inner member has a second end face facing the first end face when the inner member is mounted on the outer member, The oil seal holding member according to claim 5, further comprising one or more spacers disposed between the first end face and the second end face.

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