JP2021093800A - Geared motor - Google Patents

Abstract

To provide a geared motor with excellent quietness and low vibration.SOLUTION: A geared motor, in which an electric motor 2 having a drive shaft 21 and a gear change unit 3 that changes a driving force input with the drive shaft 21 of the electric motor 2 as an input shaft, and outputs the force from an output shaft 31 are integrally provided, includes a planetary gear reduction mechanism 50 having at least one gear change unit 3. The planetary gear reduction mechanism 50 includes a sun gear 51 that rotates by receiving a rotational force of the electric motor 2, a plurality of planetary gears 52 that circumscribe the sun gear 51 and drive the output shat 31 as it rotates, and a fixed internal gear 53 that is supported by the inner peripheral surface of a housing 36 made of a cylindrical body of the gear change unit 3 and is inscribed with the planetary gears 52, and a cushioning portion 54 made of an elastic body is arranged between the housing 36 and the fixed internal gear 53.SELECTED DRAWING: Figure 1

Description

The present invention relates to a geared motor having excellent quietness and low vibration.

Conventionally, a transmission (reduction gear) that employs a planetary gear reduction mechanism equipped with a sun gear, a planetary gear that externally meshes with the sun gear, and a fixed internal gear that internally meshes the planet gear, and a motor are integrated. The provided geared motor has been widely put into practical use.

For example, in a conventional geared motor reduction mechanism, the outer peripheral surface is non-floating and rotatably supported, and an internal gear with a sun gear attached to one side and an external gear formed at the tip of the motor shaft are in a regular gear meshing position. On the other hand, a rotating disk is fixed to the base end of the output shaft, and at least three planetary gears that mesh with the fixed internal gear fixed to the cover of the geared motor are rotated at equal intervals. It is pivotally supported as much as possible, and its three or more planetary gears mesh with each other so as to hold the center of the sun gear (see, for example, Patent Document 1).

Further, in the conventional planetary geared motor, the rotating shaft of the motor provided with the driving gear and the planetary carrier of the reduction mechanism are engaged with each other so as to be rotatable and movable along the axial direction of the rotating shaft of the motor. When the drive gear and the planetary gear are engaged with each other to connect the motor portion and the reduction mechanism portion, the length dimension of the tip of the rotary shaft beyond the drive gear mounting position of the rotary shaft of the motor is set. , At least larger than the axial length dimension of the first stage planetary gear, and the tip of the rotation shaft of the motor is inserted into the engaging part of the rotation center of the first stage planet carrier, and the planet carrier is arranged so as to support the rotation axis. (See, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 55-119249 JP-A-2002-349634

Geared motors using such a planetary gear reduction mechanism are used for various purposes, and quietness and low vibration may be required depending on the usage environment.

However, in the geared motor as described above, when a radial load is generated due to meshing of the gears, there is a problem that noise and vibration are generated due to contact between the fixed internal gear and the inner peripheral surface of the housing.

The present invention has been made to solve the above problems, and provides a geared motor having excellent quietness and low vibration.

The geared motor according to the present invention is integrally provided with an electric motor having a drive shaft and a transmission unit that shifts the driving force input by using the drive shaft of the electric motor as an input shaft and outputs the gear from the output shaft. The transmission is a geared motor having at least one stage of a planetary gear reduction mechanism, and the planetary gear reduction mechanism externally meshes with the sun gear that rotates by receiving the rotational force of the electric motor and rotates. Along with this, a plurality of planetary gears that drive the output shaft and a fixed internal gear that is fixedly supported and internally meshed with the planetary gear on the inner peripheral surface of the housing made of a cylindrical body of the transmission part are provided. A cushioning portion made of an elastic body is disposed between the two.

As described above, in the present invention, the planetary gear reduction mechanism includes a sun gear that rotates by receiving the rotational force of the electric motor and a plurality of planet gears that externally mesh with the sun gear and drive the output shaft with rotation. A fixed internal gear that is fixedly supported and supported on the inner peripheral surface of the housing made of a cylindrical body of the transmission part and internally meshes with the planetary gear is provided, and a cushioning part made of an elastic body is arranged between the housing and the fixed internal gear. Since it is installed, the radial load generated by the meshing of the gears of the planetary gear reduction mechanism is transmitted, and when the fixed internal gear arranged on the outermost side in the radial direction from the axis comes into contact with the inner peripheral surface of the housing, This radial load is absorbed by the cushioning portion made of an elastic body, and has the effect of suppressing noise and vibration caused by direct contact between the fixed internal gear and the inner peripheral surface of the housing.

In the geared motor according to the present invention, if necessary, a cushioning portion is arranged in a large-diameter portion formed by enlarging the inner diameter of the end portion of the housing on the electric motor side.

As described above, in the present invention, since the shock absorber is arranged in the large diameter portion formed by expanding the inner diameter of the end portion on the electric motor side of the housing, it is before the speed is reduced by the transmission portion. The radial load generated in the portion most affected by the high-speed rotation by the electric motor is absorbed by the buffer portion, which has the effect of suppressing the noise and vibration generated by the geared motor.

The geared motor according to the present invention has a large-diameter portion formed by expanding the inner diameter of the end portion of the housing on the electric motor side, and a housing portion and the large-diameter portion of the housing, if necessary. It is arranged at the step portion connecting the and.

As described above, in the present invention, the shock absorber has a large-diameter portion formed by expanding the inner diameter of the end portion of the housing on the electric motor side, and a stepped portion connecting the housing portion and the large-diameter portion of the housing. Since it is arranged in, the thrust load generated by the meshing of the gears of the planetary gear reduction mechanism is transmitted, and the fixed internal gear arranged on the outermost side in the radial direction from the axis comes into contact with the inner peripheral surface of the housing. At this time, the thrust load is absorbed by the cushioning portion made of an elastic body, which has the effect of suppressing noise and vibration caused by direct contact between the fixed internal gear and the inner peripheral surface of the housing.

In the geared motor according to the present invention, the stepped portion is formed in a tapered shape in which the diameter is reduced from the large diameter portion toward the accommodating portion, if necessary.

As described above, in the present invention, since the stepped portion is formed in a tapered shape in which the diameter is reduced from the large diameter portion toward the accommodating portion, the thrust load is applied even when various gears have design errors or the like. As a result, the fixed internal gear is pushed toward the output shaft along the tapered surface of the step portion, and the fixed internal gear can be fixed to the buffer portion of the step portion, resulting in noise and vibration caused by a decrease in the meshing ratio due to a design error or the like. Has the effect of being able to suppress.

In the geared motor according to the present invention, an annular recess is formed between the large diameter portion and the step portion, if necessary.

As described above, in the present invention, since the annular recess is formed between the large diameter portion and the stepped portion, the cushioning portion is provided by arranging the cushioning portion made of an elastic body along the annular recess. Can be stably fixed to the housing and can function as an escape mechanism for the stretched portion when the elastic body is thermally expanded, which has the effect of suppressing noise and vibration due to peeling of the cushioning portion and the like. Has.

In the geared motor according to the present invention, the sun gear, the planetary gear, and the fixed internal gear are oblique tooth gears or angle tooth gears, if necessary.

As described above, in the present invention, since the sun gear, the planetary gear, and the fixed internal gear are oblique tooth gears or angle tooth gears, the meshing ratio between the gears can be improved, and noise and vibration can be reduced. It has the effect of being able to be suppressed.

In the geared motor according to the present invention, if necessary, the electric motor includes a motor main body and a motor housing for accommodating the motor main body, and a bearing made of an elastic body is provided between the motor main body and the motor housing. A holding buffer is provided.

As described above, in the present invention, the electric motor includes a motor main body and a motor housing for accommodating the motor main body, and a bearing holding buffer portion made of an elastic body is arranged between the motor main body and the motor housing. Because it is installed, the electric motor is caused by noise generated between the components of the electric motor, vibration generated by driving the electric motor, and radial load and thrust load transmitted from the planetary gear reduction mechanism via the drive shaft. Since the noise and vibration of the above are absorbed by the bearing holding buffer portion made of an elastic body, there is an effect that the noise and vibration of the electric motor can be suppressed.

It is a vertical sectional view along the axis of the geared motor which concerns on this embodiment. It is an enlarged vertical sectional view along the axis of the 1st stage planetary gear reduction mechanism part which concerns on 1st Embodiment. It is an enlarged vertical sectional view along the axis of the 1st stage planetary gear reduction mechanism part which concerns on 2nd Embodiment. It is an enlarged vertical sectional view along the axis of the 1st stage planetary gear reduction mechanism part which concerns on 3rd Embodiment. It is an enlarged vertical sectional view along the axis of the 1st stage planetary gear reduction mechanism part which concerns on 4th Embodiment.

Hereinafter, embodiments of the present invention will be described. In addition, the same elements are designated by the same reference numerals throughout the present embodiment.

(First Embodiment)
The geared motor according to this embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a vertical cross-sectional view along the axis of the geared motor according to the present embodiment, and FIG. 2 is an enlarged vertical cross-sectional view along the axis of the planetary gear reduction mechanism portion of the first stage.

As shown in FIGS. 1 and 2, the geared motor 1 includes an electric motor 2 and a speed change unit 3, and the electric motor 2 and the speed change unit 3 are integrally provided. The geared motor 1 has a substantially cylindrical outer shape with the axis A as the central axis.
The electric motor 2 has a drive shaft 21 extending from the center of one end surface thereof along the axis A to the transmission unit 3 side.
The transmission unit 3 has an output shaft 31 that projects along the axis A and shifts and outputs the input driving force with the drive shaft 21 of the electric motor 2 as an input shaft.

The electric motor 2 includes a motor main body 22 and a motor housing 23 made of a substantially cylindrical body that houses the motor main body 22 inside. The drive shaft 21 is rotatably supported by the motor housing 23 via a bearing 24.
Further, the electric motor 2 includes a bearing holding buffer portion 25 made of an elastic body between the motor main body 22 and the motor housing 23. The bearing holding buffer portion 25 is interposed between the bearing 24 that pivotally supports the drive shaft 21 and the lid portion 26 of the motor housing 23 at least at both ends of the drive shaft 21, and connects the bearing 24 and the lid portion 25. It is separated.

The transmission 3 includes a mount plate 32 fixed to the end face of the electric motor 2, a flange 34 fixed on the mount plate 32 by a screw 33, a gear mechanism 40 arranged above the flange 34, and the gear mechanism. The 40 is housed therein, and a housing 36 for fixing the flange 34 by a spring pin 35 is provided.
A through hole centered on the axis A is formed in the central portion of the mount plate 32 and the flange 34, and the drive shaft 21 of the electric motor 2 is inserted through the through hole.

The gear mechanism 40 includes three-stage planetary gear reduction mechanisms 50, 60, and 70.

The first-stage planetary gear reduction mechanism 50 is fixed to the drive shaft 21 of the electric motor 2, and receives the rotational force of the electric motor 2 to rotate together with the drive shaft 21. A plurality of (for example, four) planetary gears 52 that are arranged around the gear 51 and are externally meshed with the first sun gear 51, and a housing 36 made of a cylindrical body are fixedly supported and supported over the entire inner peripheral surface. It includes a fixed internal gear 53 that internally meshes with a plurality of planetary gears 52, and a cushioning portion 54 made of an elastic body provided between the housing 36 and the fixed internal gear 53. The plurality of planetary gears 52 are rotatably held by the first carrier 55.

The housing 36 includes a storage portion 38 centered on the axis A provided on the output shaft 31 side from the vicinity of the second-stage planetary gear reduction mechanism 60, which will be described later, and an electric motor from the vicinity of the first-stage planetary gear reduction mechanism 50. The inner diameter of the end is enlarged on the inner peripheral surface on the 2 side to have a larger diameter than the storage portion 38, and a large diameter portion 37 centered on the axis A and a step portion 39 connecting the large diameter portion 37 and the storage portion 38 are provided. Have.

The cushioning portion 54 includes a circumferential portion 54a arranged along the large diameter portion 37 of the housing 36, and a bottom portion 54b fixed on the flange 34 via a washer 56 and exhibiting an annular shape. The material and type of the shock absorber 54 are not particularly limited, and any material may be used as long as it supports the radial load from the first-stage planetary gear reduction mechanism and suppresses / absorbs the vibration caused by this radial load, for example. It is a synthetic rubber such as butyl rubber. The cushioning portion 54 may be provided between the housing 36 and the fixed internal gear 53, that is, it may have at least a circumferential portion 54a.

The first carrier 55 has a plurality of input holding shafts 55a that rotatably support each planetary gear 52, and each of the input holding shafts 55a is fixed to one side surface at equal intervals in the circumferential direction about the axis A. A disk portion 55b made of a disk body and a second sun gear 61 of the second stage planetary gear reduction mechanism 60 rotatably placed on the other side surface of the disk body of the disk portion 55b with the axis A as the center. It is formed with an output holding shaft 55c that is fixedly supported. The second sun gear 61 rotates in synchronization with the first carrier 55.

The second-stage planetary gear reduction mechanism 60 is arranged around the second sun gear 61 and the second sun gear 61, and has a plurality (for example, three) of externally meshing with the second sun gear 61. A second carrier 64 that rotatably holds the planetary gear 62, the fixed internal gear 63 that is fixedly supported by the storage portion 38 of the housing 36 and internally meshes with the plurality of planetary gears 62, and the plurality of planetary gears 62. And have.

The second carrier 64 has a plurality of input holding shafts 64a that rotatably support each planetary gear 62, and each of the input holding shafts 64a is fixed to one side surface at equal intervals in the circumferential direction about the axis A. A disk portion 64b made of a disk body and a third sun gear 71 of the third-stage planetary gear reduction mechanism 70 rotatably placed on the other side surface of the disk body of the disk portion 64b with the axis A as the center. It is formed with an output holding shaft 64c that is fixedly supported. The third sun gear 71 rotates in synchronization with the second carrier 64.

The third-stage planetary gear reduction mechanism 70 is arranged around the third sun gear 71 and the third sun gear 71, and has a plurality (for example, four) of externally meshing with the third sun gear 71. A third carrier 74 that rotatably holds the planetary gear 72, the fixed internal gear 73 that is fixedly supported by the storage portion 38 of the housing 36 and internally meshes with the plurality of planetary gears 72, and the plurality of planetary gears 72. And have.

The third carrier 74 has a plurality of input holding shafts 74a that rotatably support each planetary gear 72, and each of the input holding shafts 74a is fixed to one side surface at equal intervals in the circumferential direction about the axis A. It is formed with a disk portion 74b made of a disk body. The output shaft 31 of the transmission unit 3 is fixedly supported on the other side surface of the disk body of the disk unit 64b with the axis A as the center. The output shaft 31 rotates in synchronization with the third carrier 74.

The types of sun gears, planetary gears, and fixed internal gears are not particularly limited, and may be spur gears (spar gears), oblique gears (helical gears), or angle gears (double helical gears), but the meshing ratio and strength (surface pressure). From the viewpoint of strength), quietness, etc., oblique gears or angle gears are preferable. For example, a diagonal tooth gear may be adopted in the first stage planetary gear reduction mechanism, and a spur gear may be adopted in the second and third stage planetary gear reduction mechanisms.

The geared motor 1 according to the present embodiment may include at least the above-mentioned first-stage planetary gear reduction mechanism 50.

Next, the operation of the geared motor 1 according to the present embodiment will be described.

When the electric motor 2 is energized to operate the electric motor 2, the rotation of the drive shaft 21 causes the first sun gear 51 to rotate. Then, the plurality of planetary gears 52 that are circumscribed with the first sun gear 51 rotate (rotate) around the input holding shaft 55a. At the same time, since the planetary gear 52 is inscribed in the fixed internal gear 53, it rotates (revolves) around the first sun gear 51 along the fixed internal gear 53. Since the fixed internal gear 53 is fixed to the large diameter portion 37 of the housing 36 and supports the rotation of the plurality of planetary gears 52, it is based on the rotational stress between the planetary gears 52 and the first sun gear 51. The vibration generated between the fixed internal gear 53 and the housing 36 is absorbed by the elastic force of the cushioning portion 54 interposed between the fixed internal gear 53 and the large diameter portion 37, and the vibration is suppressed. , Noise can be reduced.
In this way, a rotational force is applied to the planetary gear 52 whose vibration is suppressed, and the first carrier 55, that is, the second sun gear 61 rotates with the revolution of the planetary gear 52.

When the second sun gear 61 rotates, the plurality of planetary gears 62 circumscribing the second sun gear 61 rotate (rotate) around the input holding shaft 64a. At the same time, since the planetary gear 62 is inscribed and meshed with the fixed internal gear 63, it rotates (revolves) around the second sun gear 61 along the fixed internal gear 63. Then, as the planetary gear 62 revolves, the second carrier 64, that is, the third sun gear 71 rotates.

When the third sun gear 71 rotates, a plurality of planetary gears 72 that are circumscribed with the third sun gear 71 rotate (rotate) around the input holding shaft 74a. At the same time, since the planetary gear 72 is inscribed and meshed with the fixed internal gear 73, it rotates (revolves) around the third sun gear 71 along the fixed internal gear 73. Then, as the planetary gear 72 rotates, the third carrier 74, that is, the output shaft 31 of the transmission unit 3 rotates.

As described above, since the gear mechanism 40 includes the planetary gear reduction mechanisms 50, 60, and 70 in three stages, the rotation speed of the drive shaft 21 of the electric motor 2 is effectively reduced, and the output shaft of the transmission unit 3 is reduced. The torque of 31 can be increased, and the vibration is absorbed by the elastic force of the cushioning portion 54 interposed between the fixed internal gear 53 and the large diameter portion 37 of the housing 36, thereby causing vibration as a whole. It prevents noise and "groaning" due to resonance, and makes it possible to realize quietness of the device.

(Second embodiment)
The geared motor according to this embodiment will be described with reference to FIG. FIG. 3 is an enlarged vertical cross-sectional view of the first-stage planetary gear reduction mechanism portion according to the second embodiment along the axis.
In this embodiment, the description overlapping with the first embodiment will be omitted.

In the geared motor according to the present embodiment, unlike the first embodiment, the sun gear, the planetary gear, and the fixed internal gear are formed of oblique tooth gears or angle tooth gears, and the cushioning portion is formed in a substantially U-shaped cross section. It is a configuration to be done.
Hereinafter, an example in which an oblique gear is used as a sun gear, a planetary gear, and a fixed internal gear will be described.

The first sun gear 81 is a left-handed diagonal gear with a tooth streak raised to the left, and is clockwise when viewed from the output shaft 31 side of the transmission 3 as the drive shaft 21 of the electric motor 2 rotates. Rotate.
The plurality of planetary gears 82 are right-twisted oblique gears whose tooth streaks rise to the right, rotate counterclockwise (rotate) when viewed from the output shaft 31 side, and are viewed from the output shaft 31 side of the transmission unit 3. It rotates (revolves) around the first sun gear 81 clockwise.
The fixed internal gear 83 is a left-twisted oblique gear with a tooth streak raised to the left.

As shown in FIG. 3, the cushioning portion 84 is fixed on the flange 34 via the circumferential portion 84a arranged in a circumferential shape along the large diameter portion 37 of the housing 36 and the washer 56, and is circular. It has an annular bottom portion 84b and an annular top plate portion 84c arranged along the stepped portion 39 of the housing 36. That is, in the present embodiment, the cushioning portion 84 surrounds the fixed internal gear 83 so that the fixed internal gear 83 and the housing 36 do not come into direct contact with each other, so that at least the large diameter portion 37 and the step of the housing 36 are formed. It is arranged in the portion 39.

As described above, if oblique gears (or angle gears) are used as sun gears, planetary gears, and fixed internal gears, advantages such as meshing ratio, strength (surface pressure strength), and quietness can be enjoyed. On the other hand, there is a problem of thrust load due to meshing of gears.
That is, when the electric motor 2 is operated, in the above example, a thrust load is generated on the output shaft 31 side of the first sun gear 81, and outputs are output to the plurality of planetary gears 82 that mesh with the first sun gear 81. A thrust load is generated on the side opposite to the shaft 31 (drive shaft 21 side). Then, a thrust load is generated on the output shaft 31 side of the fixed internal gear 83 that meshes with the planetary gear 82.
Due to the thrust load on the output shaft 31 side of the fixed internal gear 83, the fixed internal gear 83 and the step portion 39 come into contact with each other, and there is a concern about noise and vibration due to this contact. On the other hand, in the geared motor 1 according to the present embodiment, since the step portion 39 is also provided with the cushioning portion 84, the thrust load generated from the plurality of planetary gears 82 on the drive shaft 21 side is applied by the bottom portion 84b. It supports and absorbs vibrations, etc., while the top plate portion 84c supports the thrust load generated by the fixed internal gear 83 on the output shaft 31 side to absorb vibrations, etc., to the stepped portion 39 of the fixed internal gear 83. As a result, it is possible to ensure quietness and low vibration when the motor is driven.

(Third Embodiment)
The geared motor according to this embodiment will be described with reference to FIG. FIG. 4 is an enlarged vertical cross-sectional view of the first-stage planetary gear reduction mechanism portion according to the third embodiment along the axis.
In this embodiment, the description overlapping with each of the above embodiments will be omitted.

As shown in FIG. 4, the geared motor 1 according to the second embodiment is different from the geared motor 1 according to the second embodiment in that the stepped portion 85 on the inner peripheral surface of the housing 36 of the transmission portion 3 is the drive shaft 21. This is a point formed in a tapered shape in which the diameter is reduced from the side toward the output shaft 31 side.

As described above, the drive of the electric motor 2 generates a thrust load on the output shaft 31 side of the fixed internal gear 83. At this time, if there is no gap between the stepped portion 39 formed of the vertical side wall and the fixed internal gear 83 in the first or second embodiment, noise and the like during motor driving can be further suppressed, but a design error can be achieved. It may be difficult to completely eliminate this gap due to assembly errors and the like.
In the present embodiment, since the step portion 85 is formed in a tapered shape, a thrust load is applied to the fixed internal gear 83 during driving, and the fixed internal gear 83 is pushed toward the output shaft 31 side along the tapered surface of the step portion 85. By doing so, it is possible to eliminate design errors and the like, and further suppress the generation of noise and vibration during driving.

(Fourth Embodiment)
The geared motor according to this embodiment will be described with reference to FIG. FIG. 5 is an enlarged vertical cross-sectional view of the first-stage planetary gear reduction mechanism portion according to the fourth embodiment along the axis.
In this embodiment, the description overlapping with each of the above embodiments will be omitted.

As shown in FIG. 5, the geared motor 1 according to the present embodiment differs from the geared motor 1 according to the third embodiment in that an annular recess 86 is formed between the step portion 85 and the large diameter portion 37. That is the point. The buffer portion 84 is bent from the large diameter portion 37 to the step portion 85 along the side surface of the annular recess 86.

The configurations shown in the above-described embodiments can be applied in combination as appropriate.

1 Geared motor 2 Electric motor 3 Transmission 21 Drive shaft 22 Motor body 23 Motor housing 24 Bearing 25 Bearing holding buffer 26 Lid 31 Output shaft 32 Mount plate 33 Screw 34 Flange 35 Spring pin 36 Housing 37 Large diameter part 38 Storage 39, 85 Step 40 Gear mechanism 50, 60, 70 Planetary gear reduction mechanism 51, 81 First sun gear 52, 82 Planetary gear 53, 83 Fixed internal gear 54 Buffer 54a Circumferential 54b Bottom 55 First Carrier 55a Input holding shaft 55b Disc 55c Output holding shaft 56 Washer 61 Second sun gear 62 Planetary gear 63 Fixed internal gear 64 Second carrier 64a Input holding shaft 64b Disc 64c Output holding shaft 71 Second Sun gear 72 Planetary gear 73 Fixed internal gear 74 Second carrier 74a Input holding shaft 74b Disc portion 84 Cushioning portion 84a Circumferential portion 84b Bottom portion 84c Top plate portion 86 Circular recess A Axial line

Claims (7)

An electric motor having a drive shaft and a transmission unit that shifts the driving force input by using the drive shaft of the electric motor as an input shaft and outputs the speed from the output shaft are integrally provided, and the transmission unit has at least one stage. A geared motor with a planetary gear reduction mechanism.
The planetary gear reduction mechanism includes a sun gear that rotates by receiving a rotational force from the electric motor, a plurality of planet gears that externally mesh with the sun gear and drive the output shaft with rotation, and a transmission unit. It is provided with a fixed internal gear that is fixedly supported and supported on the inner peripheral surface of a housing made of a cylindrical body and that internally meshes with the planetary gear.
A geared motor characterized in that a cushioning portion made of an elastic body is disposed between the housing and the fixed internal gear. In the geared motor according to claim 1,
A geared motor characterized in that the buffer portion is arranged in a large diameter portion formed by enlarging the inner diameter of the end portion on the electric motor side of the housing. In the geared motor according to claim 1 or 2.
The buffer portion is arranged in a large-diameter portion formed by expanding the inner diameter of the end portion of the housing on the electric motor side, and a step portion connecting the storage portion of the housing and the large-diameter portion. A geared motor that is characterized by being used. In the geared motor according to claim 3,
A geared motor characterized in that the step portion is formed in a tapered shape in which the diameter is reduced from the large diameter portion toward the storage portion. In the geared motor according to claim 4,
A geared motor characterized in that an annular recess is formed between the large diameter portion and the step portion. In the geared motor according to any one of claims 1 to 5.
A geared motor in which the sun gear, the planetary gear, and the fixed internal gear are oblique tooth gears or angle tooth gears. In the geared motor according to any one of claims 1 to 6.
The electric motor includes a motor body and a motor housing that houses the motor body.
A geared motor characterized in that a bearing holding cushioning portion made of an elastic body is disposed between the motor body and the motor housing.

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