JPH10225054A - Motor with speed reducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent vibration and noise and keep the inside of a cylinder- shaped casing in an airtight condition by installing an elastic material between an inner face of the cylinder-shaped casing and an outer face of a being member. SOLUTION: In a motor 1 with a speed reducer, O-rings 9 made of elastic material such as rubber are installed between outer faces of a closure 2, bearing housing 20, and epicycle reduction gear 6 and an inner face of a cylinder-shaped casing 3. Especially, the epicycle reduction gear 6 is provided on both sides in the axis direction with two O-rings 9. The closure 2, the bearing housing 20, and the epicycle reduction gear 6 have on their outer faces one or more screw holes 23 which spiral toward the center. And, rotation stopping screws 12 are screwed into the screw holes 23 via through holes 31 of the cylinder- shaped casing 3 to prevent the rotation of the closure 2, the bearing housing 20, and the epicycle reduction gear 6 against the cylinder-shaped casing 3 and the movement of these members in the axis direction. Because of this structure, vibration and noise can be prevented and an airtightness of the inside of the cylinder-shaped casing can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device for shutters, curtains, awnings and the like in houses, shops, agricultural greenhouses, etc., electric beds, labor-saving machines, transport machines,
A motor with a speed reducer applied to an actuator device such as a sorting machine, which relates to a motor with a speed reducer configured to rotate an output shaft around an axis by driving a motor built in a cylindrical casing. is there.

[0002]

2. Description of the Related Art Conventionally, there is known an electric motor with a speed reducer in which an output shaft is rotated around an axis by driving a built-in electric motor. This electric motor with a reduction gear has a cylindrical casing,
The motor includes a motor fixed in the cylindrical casing, and a speed reducer that speed-changes the rotation of a drive shaft of the motor and transmits the speed to an output shaft. The output shaft is connected to a predetermined device to be rotated via a predetermined coupling member, whereby the rotation of the output shaft is transmitted to the device to be rotated.

In such an electric motor with a speed reducer, since the electric motor and the speed reducer are provided in a very narrow space in a cylindrical casing, those each having a small size and capable of sufficiently performing functions are employed. Particularly, as for the speed reducer, a planetary gear speed reducer having a large space utilization efficiency while having a small capacity is employed.

The planetary gear reducer has a cylindrical internal gear having internal teeth formed on the inner peripheral surface thereof, and a plurality of sets of sun gears, planetary gears, and planetary gear shafts mounted on the internal gear. It consists of a disk. The sun gear on the drive shaft side (upstream side) is coaxially and integrally connected to the drive shaft, and the sun gear on the output shaft side (downstream side) is slidingly fitted concentrically on the output shaft,
Another sun gear is disposed between the two sun shafts in a separated state. Each planet gear meshes with a plurality of planet gears, and each planet gear meshes with an internal gear.When the sun gear rotates, each planet gear revolves around the sun gear. I have.

The planetary gear supporting disk is fixed so as to rotate concentrically with the next sun gear counting from the upstream side, and the upstream planetary gear can rotate around the gear supporting shaft on this supporting disk. It is pivoted on. The lowermost planetary gear support disk is concentrically and integrally connected to the output shaft. Therefore, the rotation of the drive shaft is transmitted from the upstream in each gear set while being decelerated sequentially from the upstream to the rotation of the sun gear, the revolution of the planetary gear, the rotation of the planetary gear support disk, and finally to the most downstream side. The power is transmitted from the planetary gear support disk to the output shaft.

[0006]

By the way, in the above-mentioned conventional electric motor with a speed reducer, the electric motor and the speed reducer are press-fitted into a cylindrical casing and then fastened with a screw from the outer peripheral surface of the cylindrical casing. However, the cylindrical casing may be deformed at the time of press-fitting, and its cross-sectional shape may not be a perfect circle. In this case, the drive shaft of the electric motor does not coincide with the center line of the internal gear, and as a result, the drive shaft And the output shaft are eccentric. As a result, when the motor is driven, vibration and noise are generated due to the drive shaft and the output shaft rotating in an eccentric state.

If the above eccentricity occurs, the meshing of the gears in the reduction gear provided in the cylindrical casing becomes unbalanced, and the teeth of the gears in the meshing portion with an excessive force applied become severely worn. There is also a problem that the life of the gear is shortened.

Further, due to the deformation of the cylindrical casing, the outer peripheral surface of the disk-shaped bearing member that supports the drive shaft and the output shaft in the cylindrical casing, and the inner peripheral surface of the cylindrical casing. There is a problem that a gap is formed, and noise and lubricating oil in the cylindrical casing leak to the outside through this gap, and conversely, dust and rainwater enter the cylindrical casing from the outside.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can prevent vibration and noise due to eccentricity between a drive shaft and an output shaft. It is an object of the present invention to provide an electric motor with a speed reducer capable of ensuring performance.

[0010]

According to the first aspect of the present invention,
An electric motor having a cylindrical casing, a bearing member provided inside the cylindrical casing and supporting the drive shaft, and a reduction gear having a bearing member provided inside the cylindrical casing and supporting the output shaft. A motor having a speed reducer configured to transmit the rotational drive of the drive shaft of the electric motor to the output shaft via a speed reducer, wherein an inner peripheral surface of the cylindrical casing and an outer periphery of the bearing member are provided. An elastic material is interposed between the surface and the surface.

According to this invention, the bearing member is fitted into the cylindrical casing from one opening through the elastic member while the electric motor is press-fitted into the cylindrical casing, and the inside of the cylindrical casing is inserted from the other opening. The electric motor and the reduction gear are mounted in the cylindrical casing by fitting the reduction gear through an elastic member.

Therefore, the bearing member is set by a simple operation of setting the elastic member to be interposed between the bearing member and the inner peripheral surface of the cylindrical casing and pushing the bearing member and the speed reducer into the cylindrical casing. The reduction gear is mounted in a cylindrical casing, and when both are mounted, the mounting state of the motor with the reduction gear is simplified because the mounted state is stabilized by the compression elastic deformation of the elastic member. .

[0013] With the electric motor and the reduction gear mounted in the cylindrical casing, even if the drive shaft and the output shaft are mutually eccentric, the inner peripheral surface of the cylindrical casing and the bearing member and the reduction gear are not eccentric. Since an elastic member made of an elastic material is interposed between the elastic member and the outer peripheral surface, the vibration caused by the eccentricity when the electric motor is driven is absorbed by the elastic deformation of the elastic member, and the generation of noise is suppressed. .

According to a second aspect of the present invention, in the first aspect of the present invention, the motor-side bearing member is provided in one opening of the cylindrical casing, and the reduction gear-side bearing member is provided in the other opening. It is characterized by being provided.

According to the present invention, since the inside of the cylindrical casing is closed by the bearing member, the intrusion of dust and rainwater into the cylindrical casing is prevented, and the noise generated in the cylindrical casing is prevented. And the lubricating oil are prevented from leaking to the outside.

The third aspect of the present invention is the first or second aspect.
In the above invention, the elastic member is formed in a ring shape.

According to the present invention, since the inside of the cylindrical casing becomes a closed space by attaching the elastic member to both opening portions of the cylindrical casing, noise generated in the cylindrical casing and lubricating oil are transmitted to the outside. Leakage is prevented. In addition, intrusion of rainwater and dust into the cylindrical casing is prevented.

According to a fourth aspect of the present invention, in the first aspect of the present invention, an annular fitting groove into which the elastic member is fitted is formed on the outer peripheral surfaces of the bearing member and the speed reducer. It is characterized by being recessed.

According to the present invention, since the elastic member fits into the fitting groove formed in the outer peripheral surface of the bearing member and the speed reducer, the mounting state of the elastic member is stabilized.

[0020]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a motor with a speed reducer according to the present invention, and FIG. 2 is a sectional view of the motor with a speed reducer of FIG. . As shown in these figures, an electric motor 1 with a speed reducer has a disk-shaped lid 2, a cylindrical casing 3 whose one opening is closed by the lid 2, and is fixed in the cylindrical casing 3. Motor 4 and the electric motor 4 in the cylindrical casing 3.
The rotation of the drive shaft 5 is reduced and the cylindrical casing 3 is rotated.
Planetary gear reducer (reducer) 6 that closes the other opening of the gear
And an output shaft 7 connected to the drive shaft 5 via the planetary gear reducer 6, and a brake structure 8 for stopping rotation of the drive shaft 5. Electric motor 4
A disc-shaped bearing housing 20 is provided between the planetary gear unit 6 and the planetary gear reducer 6.

The cover 2, bearing housing 20 and planetary gear reducer 6 are dimensioned to have an outer diameter slightly smaller than the inner diameter of the cylindrical casing 3, and the outer diameter of the stator 41 of the motor 4 Is slightly larger than the outer diameter of the cylindrical casing 3 so that the lid 2, the bearing housing 20 and the planetary gear reducer 6
Is mounted in the cylindrical casing 3, a slight gap is formed between the inner peripheral surface of the cylindrical casing 3 and the outer peripheral surfaces of the lid 2, the bearing housing 20 and the planetary gear reducer 6. At the same time, the outer peripheral surface of the stator 41 of the electric motor 4 is in close contact with the inner peripheral surface of the cylindrical casing 3.

A circular hole 21 for supporting the drive shaft 5 via a bearing 11 is formed in the center of the cover 2 and the bearing housing 20. In addition, an insertion hole 22 for a power supply lead wire L is formed in the lid 2.
The lead wire L is drawn into the cylindrical casing 3 through 2, whereby electric power is supplied to the electric motor 4.

An O-ring (elastic member) 9 made of an elastic material such as rubber is interposed between the outer peripheral surface of the lid 2, the bearing housing 20 and the planetary gear reducer 6 and the inner peripheral surface of the cylindrical casing 3. Has been established. In particular, the planetary gear reducer 6
Are provided with two O-rings 9 on both sides in the axial direction. The O-ring 9 and a rotation screw 12 to be described later prevent the lid 2 and the cylindrical casing 3 from rotating relative to each other.

The cover 2, the bearing housing 20, and the planetary gear reducer 6 have one or a plurality of circumferentially threaded holes 23 screwed toward the center on the outer peripheral surface thereof. On the other hand, the cylindrical casing 3 has an insertion hole 31 corresponding to the screw hole 23. By screwing the rotation set screw 12 into the screw hole 23 through the insertion hole 31, the head of the rotation set screw 12 is loosely fitted in the insertion hole 31 in a sliding state. Thus, the rotation of the lid 2, the bearing housing 20, and the planetary gear reducer 6 with respect to the cylindrical casing 3 is prevented, and the movement in the axial direction is also prevented.

The induction motor 4 mounted in the cylindrical casing 3 includes a stator 41 having an outer diameter slightly larger than the inner diameter of the cylindrical casing 3 such that the stator 41 can be pressed into the cylindrical casing 3, and the stator 41. And a rotor 42 mounted in the inside 41. The stator 41 includes:
A stator core 43 is used, and a plurality of cores project at equal pitches from the inner peripheral surface of the stator core 43 toward the center. A stator winding 44 is formed on each core. Further, the drive shaft 5 is provided so as to co-rotate around the axis through the center portion of the rotor 42.

The electric motor 4 is fixed in the cylindrical casing 3 by pressing the stator 41 into the cylindrical casing 3. The stator 41 is cut so that a part of the circumference thereof is linear when viewed from the end face, so that the stator 41 press-fitted into the cylindrical casing 3 is prevented from rotating.

FIG. 3 is an enlarged cross-sectional view showing the cylindrical casing 3 on the side of the electric motor 4, particularly for explaining the brake structure 8. As shown in this figure, the brake structure 8 includes a stationary brake plate 81 provided on the electric motor 4 side of the bearing housing 20, a first brake plate 82 and a second brake plate 83 which sandwich the stationary brake plate 81. It is provided with.

The stationary brake plate 81 has an annular shape in plan view, has locking claws projected radially on its outer peripheral surface, and has an outer diameter larger than the diameter of the drive shaft 5 at the center. A through hole 81a having dimensions is provided. By fitting the locking claw into the notch groove 20a provided in the bearing housing 20 in a state where the drive shaft 5 is inserted into the through hole 81a, the stationary brake plate 81 is prevented from rotating in the bearing housing 20. It is designed to be attached to.

The first brake plate 82 is formed in a disk shape, and is provided to the right of the stationary brake plate 81 in the drawing. An annular brake lining 82a is provided on the left peripheral edge of the first brake plate 82. Also,
The second brake plate 83 is formed in a disk shape having the same outer diameter as the first brake plate 82 and is loosely fitted to the drive shaft 5.

An annular brake lining 83a facing the brake lining 82a is provided on the right peripheral edge of the second brake plate 83.
The stationary brake plate 81 is pressed and clamped by the brake linings 82a and 83a of the first brake plate 82 and the second brake plate 83 by pushing the rightward of the drive shaft 3 to the right, whereby the rotation of the drive shaft 5 is braked. It has become so.

When the motor 4 is stopped,
The second brake plate 83 is pressed in the direction of the stationary brake plate 81 by the urging force of the coil spring 84, whereby the brake lining 82 a of the first brake plate 82 is pressed via the brake lining 83 a of the stationary brake plate 81, The stationary brake plate 81 is pressed and sandwiched between the first brake plate 82 and the second brake plate 83 so that the rotation of the drive shaft 5 that rotates together with the first brake plate 82 is suppressed.

When a current is supplied to the motor 4 in this state, a rotating field magnetic flux is generated in the field gap, and the rotor 42
Starts rotating, while the attracted object 85 is attracted to the rotor 42 by the field magnetic flux generated on the end face of the rotor 42, and the second brake plate 83 is separated from the stationary brake plate 81 against the urging force of the coil spring 84. Then, the braking state of the drive shaft 5 is released.

FIG. 4 is an enlarged sectional view showing one embodiment of the planetary gear reducer 6. As shown in the figure, the planetary gear reducer 6 includes a cylindrical internal gear 61 having a bottom and housed in a cylindrical casing 3, and a drive shaft 5 in a gear storage chamber 6 a of the internal gear 61. Three sun gears 62 (first sun gear 62a, second sun gear 62
b and the third sun gear 62c), and each sun gear 62a,
The three sets of planetary gears 63 meshing with the internal gears 62b and 62c and meshing with the internal teeth 61a of the internal gear 61, respectively.
(The first planetary gear 63a, the second planetary gear 63b, and the third
Planetary gear 63c) and each of the planetary gears 63a, 63b, 63
three supporting disks 64 (first supporting disk 64)
a, a second pivot disk 64b and a third pivot disk 64c).

The bottom of the internal gear 61 (right side wall)
61b is provided with a center hole 61c through which the output shaft 7 is slidably inserted. A cover 65 having a flange portion having the same diameter as the outer diameter of the internal gear 61 is fitted into the left end opening of the internal gear 61, and the bearing housing 20 A center hole 65a is formed in which the right end of the drive shaft 5 projecting rightward from the center hole is loosely fitted.

The first sun gear 62a is formed integrally with the drive shaft 5 at the right end of the drive shaft 5 penetrating the center hole 65a of the lid 65 and at the left end in the gear storage chamber 6a. . Four first planetary gears 63a are meshed with the first sun gear 62a at the same pitch in the circumferential direction.
Each first planetary gear 63 a meshes with an internal tooth 61 a of the internal gear 61. The first planetary gear 63a is rotatably supported around four gear support shafts 66 protruding from the left side surface of the first support disk 64a so as to extend in the axial direction of the drive shaft 5. I have.

The second sun gear 62b is formed so as to protrude rightward so as to be corotatable with the center portion of the first pivot disk 64a, and is provided with four second planetary gears 6 at the same pitch in the circumferential direction.
3b meshes with each other, and each second planetary gear 63b meshes with the internal teeth 61a of the internal gear 61. Such a second planetary gear 63b is rotatably supported on a second support disk 64b around a gear support shaft 66.

The third sun gear 62c is formed to protrude rightward so as to be corotatable with the center portion of the second pivot disk 64b. The right end face of the third sun gear 62c has an axial center at the center portion. A cylindrical fitting protrusion 62d extending in the direction is protruded. If the fitting protrusion 62d is fitted in the fitting hole 71 formed in the left end surface of the output shaft 7 in a sliding contact state, the rotation of the third sun gear 62c is not transmitted to the output shaft 7. ing.

The third sun gear 62c is meshed with four third planetary gears 63c at the same pitch in the circumferential direction, and each of the third planetary gears 63c is connected to the internal teeth 6 of the internal gear 61.
1a. These third planetary gears 63c are rotatably supported around four gear support shafts 66 protruding from the left side surface of the third support disk 64c so as to extend in the axial direction of the drive shaft 5. And the third pivot disk 64c
The central portion is fitted around the left end of the output shaft 7 so as to be corotatable, so that rotation of the third pivoting disk 64c around the axis is transmitted to the output shaft 7.

The output shaft 7 has a prism 72 at the tip (right side in the drawing). Then, by inserting the prism portion 72 into a connection hole of a predetermined device to be rotated (not shown),
The rotation of the output shaft 7 is transmitted to the rotated device.

A pair of O-rings 9 made of an elastic material such as rubber are interposed between the outer peripheral surface of the internal gear 61 and the inner peripheral surface of the cylindrical casing 3 and at two locations in the axial direction. The internal gear 61 and the cylindrical casing 3 are concentric by the elastic force of the O-ring 9 due to the elastic deformation.

According to the configuration of the planetary gear reducer 6, the rotation of the drive shaft 5 in the direction around the axis by the drive of the electric motor 4 is:
A first sun gear 62a, a first planetary gear 63a, a first pivot disk 64a, a second sun gear 62b, a second planet gear 63b, a second pivot disk 64b, a third sun gear 62c, a third planet gear 63c, and It is transmitted to the output shaft 7 at a predetermined deceleration cost via the third pivot disk 64c.

The present invention relates to an electric motor with a speed reducer 1 constructed as in the above embodiment, as shown in FIG. 1, wherein an inner peripheral surface of a cylindrical casing 3 and an outer peripheral surface of a lid 2 are provided. O-rings 9 are provided between the inner peripheral surface and the outer peripheral surface of the bearing housing 20 and between the inner peripheral surface and the outer peripheral surface of the planetary gear reducer 6, respectively.

By interposing the O-ring 9,
The stator 41 of the electric motor 4 is press-fitted into the cylindrical casing 3 to ensure a secure fixing, and even if the axis of the drive shaft 5 of the electric motor 4 is slightly deviated during the press-fitting operation, the drive shaft It is possible to eliminate inconveniences such as generation of noise in the planetary gear reducer 6 due to misalignment of the output shaft 7 of the planetary gear reducer 6 with the output shaft 7 and a reduction in driving force transmission efficiency.

In this embodiment, the lid 2,
Annular grooves (fitting grooves) 32 extending in the circumferential direction are formed in the outer peripheral surfaces of the bearing housing 20 and the planetary gear reducer 6. In particular, the planetary gear reducer 6 is provided with annular grooves 32 on both axial sides. Have been.

The inner diameter of the O-ring 9 is the same as that of the annular groove 32.
The O-ring 9 is elastically deformed and slightly extended in a state where the O-ring 9 is fitted in each of the annular grooves 32. The state of fitting into is stabilized.
In the present embodiment, as the material of the O-ring 9, silicon rubber which is tough and excellent in heat resistance, solvent resistance and the like is employed.

FIG. 5 is a cross-sectional view showing a state where an O-ring 9 is interposed between the cylindrical casing 3 and the lid 2. Note that the same applies between the cylindrical casing 3 and the bearing housing 20 and between the cylindrical casing 3 and the planetary gear reducer 6.
The description between the cylindrical casing 3 and the lid 2 will be described as a representative.

As shown in FIG. 5, the groove width D of the opening of the annular groove 32 is set slightly larger than the diameter d of the O-ring 9, and the depth is the radius of the O-ring 9 ( d / 2). Accordingly, a part of the O-ring 9 projects outside from the opening of the annular groove 32 in a state of being fitted in the annular groove 32.

When the O-ring 9 is fitted in the annular groove 32, a gap L is formed between the inner peripheral surface of the cylindrical casing 3 and the outer peripheral surface of the lid 2.

As described above, even when the drive shaft 5 and the output shaft 7 are mutually eccentric, the vibration caused by the eccentricity when the electric motor 4 is driven is absorbed by the elastic deformation of the O-ring 9 and the noise is reduced. Generation can be reliably suppressed, and the driving force transmission efficiency of the electric motor 4 can be improved.

Further, since the inside of the cylindrical casing 3 is sealed by the O-ring 9, leakage of the generated noise to the outside can be effectively prevented. In addition, dust and rainwater can be reliably prevented from entering the cylindrical casing 3.

Further, eccentricity occurs between the cylindrical casing 3 and the output shaft 7, and due to this eccentricity, the cylindrical casing 3
The meshing between the sun gear 62 and the planetary gear 63 and the meshing between the planetary gear 63 and the internal gear 61 become unbalanced in the planetary gear reducer 6 built in Even if there is an inconvenience that an excessive force acts, the excessive force is effectively absorbed by the elastic deformation of the O-ring 9, so that the planetary gear reducer 6 due to the abnormal wear of each gear caused by the above-mentioned imbalance in meshing. Can be reliably prevented from being shortened.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above embodiment, the O-ring 9 is brought into contact with the inner peripheral surface of the cylindrical casing 3, but the inner peripheral surface of the cylindrical casing 3 corresponds to the O-ring 9. An annular recess may be provided. By doing so, it is possible to obtain a click feeling when the O-ring 9 fits into the annular concave portion when the cover 2, the bearing housing 20, and the planetary gear reducer 6 are mounted in the cylindrical casing 3.
Since the mounting position is confirmed by this click feeling, the positioning operation in the cylindrical casing 3 such as the lid 2 can be easily performed.

(2) In the above embodiment, the O-ring 9 is applied as the elastic member. Instead of the O-ring 9, a spherical or cylindrical elastic member made of an elastic material is provided in the annular groove 32 at a predetermined pitch. May be arranged. in this case,
It is preferable to change the annular groove 32 into a mounting hole so as to match the small spherical or cylindrical elastic member. By doing so, it is possible to prevent the movement of the small spherical or cylindrical elastic member in the circumferential direction.

(3) In the above embodiment, the O-ring 9 is made of silicon rubber, but the O-ring 9 is made of a material other than silicon rubber, such as styrene-butadiene rubber, high-styrene rubber, butadiene. Rubber, isoprene rubber, chloroprene rubber, butyl rubber, urethane rubber, polysulfide rubber, fluorine rubber and the like can be used.

(4) In the above embodiment, the lid 2 for supporting the drive shaft 5 is provided at one opening of the cylindrical casing 3, but the electric motor 4 has the stator 41 provided with a cylindrical cover. The drive shaft 5 is mounted on this cover.
In the case where a bearing that supports the O is provided, the O-ring 9 may be attached to the cover instead of the lid 2.

[0057]

According to the first aspect of the present invention, since the elastic member made of an elastic material is interposed between the inner peripheral surface of the cylindrical casing and the outer peripheral surfaces of the bearing member and the speed reducer, the electric motor is provided. Even when the drive shaft and the output shaft of the speed reducer are eccentric to each other, the vibration caused by the eccentricity can be absorbed by the elastic deformation of the elastic member when the motor is driven, and the generation of noise can be reduced. Can be suppressed.

According to the second aspect of the invention, the bearing member on the motor side is provided in one opening of the cylindrical casing, and the bearing member on the reduction gear side is provided in the other opening. In addition, since the housing is closed by the bearing member, it is possible to prevent dust and rainwater from entering the cylindrical casing and to prevent noise and lubricating oil generated in the cylindrical casing from leaking to the outside. be able to.

According to the third aspect of the present invention, since the elastic member is formed in a ring shape, the inside of the cylindrical casing becomes a closed space by attaching the elastic member to both opening portions of the cylindrical casing. It is possible to prevent noise generated inside and leakage of lubricating oil to the outside. Further, it is possible to prevent dust and rainwater from entering the cylindrical casing.

According to the fourth aspect of the present invention, the annular fitting groove into which the elastic member is fitted is recessed in the outer peripheral surfaces of the bearing member and the speed reducer. The elastic member can be stably fitted in the fitting groove formed in the elastic member.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of an electric motor with a speed reducer according to the present invention.

FIG. 2 is a sectional view of the electric motor with a speed reducer of FIG. 1;

FIG. 3 is an enlarged sectional view showing a motor side of a cylindrical casing.

FIG. 4 is an enlarged sectional view showing one embodiment of a planetary gear reducer.

FIG. 5 is a cross-sectional view showing an interposed state of an O-ring between a cylindrical casing and a bearing housing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor with reduction gear 2 Lid 3 Cylindrical casing 31 Insertion hole 32 Annular groove (fitting groove) 4 Electric motor 5 Drive shaft 6 Planetary gear reducer (reducer) 61 Internal gear 62 Sun gear 63 Planetary gear 64 Axle support Disk 65 Lid 7 Output shaft 8 Brake structure 81 Stationary brake plate 82 First brake plate 83 Second brake plate 9 O-ring

Claims (4)

[Claims] An electric motor having a cylindrical casing, a bearing member provided inside the cylindrical casing and supporting a drive shaft, and a bearing provided inside the cylindrical casing and supporting an output shaft. A speed reducer having a member, wherein the motor with a speed reducer configured to transmit the rotational drive of the drive shaft of the motor to the output shaft via the speed reducer,
An electric motor with a speed reducer, wherein an elastic material is interposed between an inner peripheral surface of the cylindrical casing and an outer peripheral surface of the bearing member. 2. The bearing member according to claim 1, wherein a bearing member on the electric motor side is provided in one opening of the cylindrical casing, and a bearing member on the reduction gear side is provided in the other opening. Electric motor with reduction gear. 3. The electric motor with a speed reducer according to claim 1, wherein the elastic member is formed in an annular shape. 4. The bearing according to claim 1, wherein an annular fitting groove into which the elastic member is fitted is recessed on the outer peripheral surfaces of the bearing member and the speed reducer. Motor with speed reducer.