JPH0534214Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electric motor equipped with a speed reduction mechanism.

[Prior art and problems to be solved by the invention] Conventional electric motors are configured to be driven at a required number of rotations depending on the frequency of the supplied power. Therefore, in order to obtain the required number of rotations, a frequency variable device is required to change the frequency of the supplied power to a frequency corresponding to the number of rotations, making the device complicated and expensive.
In addition, a reduction mechanism that combines a large number of gear trains is generally used as a means of obtaining the required rotation speed, but in order to obtain a high reduction ratio with such a reduction mechanism, a large number of gears is required. Therefore, there are problems in that the device becomes larger, heavier, and more expensive.

[Purpose of the invention] In view of the above-mentioned conventional drawbacks, the purpose of the invention is to
It is an object of the present invention to provide an electric motor with a speed reduction mechanism that can obtain a desired high speed reduction ratio with a simple configuration, and can also reduce the size, weight, and cost of the device.

[Means for Solving the Problems] Therefore, the present invention includes a rotating shaft 9 provided integrally with a rotor 11 having a permanent magnet 13 in a housing 3, and a rotating shaft 9 having a number n of teeth attached to the rotating shaft 9. In ^an electric motor with a speed reduction mechanism, the speed reduction mechanism 7 includes an output shaft 19 rotatably supported by the housing 3, and a speed reduction mechanism 7. The internal teeth 21 having n ² teeth are formed on the inner circumferential surface, and the first external teeth 23 having n ³ teeth are formed on the output side.
an internally toothed rotating body 22 formed with
Rotatably supported by the output shaft 19 on the output side of 2,
A first planetary gear 3 meshing with the first external teeth 23 on the outer peripheral side
1 is rotatably supported and has the number of teeth n ⁵ on the output side.
The first rotating member 27 has second external teeth 29 formed thereon.
A second planetary gear 37 is rotatably supported on the output shaft 19 on the output side of the first rotating member 27, and is rotatably supported on the outer circumferential side and meshes with the second external teeth 29. a second rotating member 33 on which third external teeth 35 of ⁿ⁶ are formed; and a third planetary gear fixed to the output shaft 19 on the output side of the second rotating member 33 and meshing with the third external teeth 35 on the outer peripheral side. 43 is rotatably supported by a fixed ring 39, a first rotating member 27,
It is characterized by comprising an internal gear member 25 having n ⁴ teeth that meshes with the first to third planetary gears 31, 37, and 43, respectively, on the outer periphery of the second rotating member 33 and the fixed ring 39.

[Operation of the invention] Since the invention is configured as described above, when the rotating shaft of the synchronous motor is rotated at a predetermined number of rotations N depending on the power supply frequency, the internal tooth rotation that meshes with the output gear of the rotating shaft occurs. The body rotates around the axis of the output shaft N ¹ = N・
It rotates with a reduction ratio of n ¹ /n ² . As the internally toothed rotating body rotates, the first planetary gear meshing with the first external teeth and the internally toothed member causes the first rotating member to achieve N ² =
It is rotated by N ¹・1/(n ³ − ^{n 4} ). Further, as the first rotating member rotates, the second rotating member is rotated by the second planetary gear that meshes with the second external tooth and the internal tooth member.
N ³ = N ²・1/(n ⁵ − ^{n 4} ), and the fixed ring is fixed by the third planetary gear that similarly meshes with the third external tooth and internal tooth member, N ⁴ = N ³・1/(n ⁶ − n ⁴ ), the output shaft becomes N・n ¹・1/{n ²・(n ³ −n ⁴ )・(n ⁵ −n ⁴ )・(n ⁶ −
n ⁴ )} is rotated at a high reduction ratio.

[Example] An example of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view schematically showing an electric motor with a speed reduction mechanism according to the present invention, and FIG. 2 is a central vertical sectional view of the electric motor with a speed reduction mechanism.
The cylindrical casing 3 includes a synchronous motor 5 and a speed reduction mechanism 7.
is built-in.

The synchronous motor 5 has a rotating shaft 9 at a position offset from the center of the cylindrical casing 3 as a housing.
is rotatably supported, and a rotor 1 is mounted on the rotating shaft 9.
1 is integrally molded. That is, the permanent magnets 13 of the rotor 11, the outer skin 15 covering the permanent magnets 13, and the rotating shaft 9 are integrally molded from engineering resin such as polyamide resin or polycarbonate resin. The permanent magnet 13 is formed by molding a magnetic material into a flat plate using a sintering technique or a pressing technique, magnetizing it in a strong magnetic field, and then dividing it into prismatic shapes of a required size. . The rotating shaft 9
The output gear 17 is made of the aforementioned synthetic resin and has n ¹ teeth and is integrally molded therein. Furthermore, the rotor 1
1 is rotatably supported within an iron core 18, and as an excitation coil 20 attached to the iron core 18 is energized, the rotor 11 is rotated in a required direction according to the frequency of the power supplied. It is driven to rotate at a rotational speed N.

The center of the cylindrical casing 3 has an axis that coincides with the cylindrical casing 3, and one end of an output shaft 19 constituting a part of the reduction mechanism 7 is rotatably supported by a boss 24a of the partition block 24. At the right end in the axial direction of the output shaft 19, an internal tooth 21 having n ² teeth and a first external tooth 23 having n ³ teeth are formed. A connecting member 22 is an internally toothed rotating body.
is rotatably supported around the axis, and the internal teeth 2
1 is meshed with the output gear 17. On the inner peripheral surface of the cylindrical casing 3, a ring-shaped internal gear member 25, which constitutes a part of the speed reduction mechanism 7 and has n ⁴ teeth, is attached. Then, the output shaft 1
A first rotating member 27 is supported on the right side in the axial direction of 9 so as to be rotatable around the axis.
The boss portion 27a constitutes a part of the deceleration mechanism 7,
The first rotating member 27 has a second external tooth 29 having a number of teeth n ⁵ , and a first planetary gear 31 that meshes with both the external tooth 23 and the internal tooth member 25 on the flange 27b of the first rotating member 27. It is rotatably supported in three divided positions centered on . A second rotating member 33 is disposed on the output shaft 19 corresponding to the left side of the first rotating member 27 in the axial direction.
is rotatably supported around the axis, and the boss portion 33a of the second rotating member 33 is provided with a third external tooth 35, which constitutes a part of the deceleration mechanism 7 and has a number of teeth n ⁶ . A speed reduction mechanism 7 is attached to the collar 33b of the rotating member 33.
The second external tooth 29 and the internal tooth member 2
A second planetary gear 37 meshing with both the second rotating member 33 and the second rotating member 33 is rotatably supported at three divided positions with the second rotating member 33 as the center. A fixing ring 39 constituting a fixing member is attached to the output shaft 19 corresponding to the left side of the second rotating member 33 in the axial direction in a state in which it is prevented from rotating by a fixing pin 41, and the flange 39a of the fixing ring 39 is A third planetary gear 43 that meshes with both the third external gear 35 and the internal gear member 25 is attached to the fixed ring 39.
It is rotatably supported in three divided positions centered on . The left end of the output shaft 19 in the axial direction is rotatably supported by the cylindrical casing 3 via a pole bearing 45. A closing block 47 is attached to the right end of the cylindrical casing 3 in the axial direction.

Next, the operation of the electric motor 1 with a speed reduction mechanism configured as described above will be explained.

When the rotating shaft 9 is rotated at the required rotation speed N as the synchronous motor 5 is driven, the connecting member 22 is rotated at the rotation speed N.
It is rotated by N1=N・n ¹ /n ¹ . As a result, as the connecting member 22 rotates, the first rotating member 27
is the number of teeth n ³ of the first external tooth 23 and the number n ⁴ of teeth of the internal tooth member 25
Required rotation speed N2 = N1・1/ according to the difference in the number of teeth between
It is rotated by (n ³ − n ⁴ ). Next, as the first rotating member 27 rotates, the second rotating member 33 performs a required rotation according to the difference between the number of teeth n ⁵ of the second external tooth 29 and the number n ⁴ of the internal tooth member 25. Number N3=N2・1/(n ⁵ −
n ⁴ ). The output shaft 19 is rotated by the third external teeth 35 as the second rotating member 33 rotates.
It is rotated at a required rotational speed N4=N3·1/( ⁿ⁶ - ⁿ⁴ ) according to the difference between the number of teeth n6 of the internal teeth ²⁵ and the number ⁿ⁴ of teeth of the internal teeth 25. That is, the output shaft 19 has a rotation speed N of the rotational shaft 9 of N・n ¹・1/{n ²・(n ³ −n ⁴ )・(n ⁵
−n ⁴ )・(n ⁶ −n ⁴ )}, it is rotated at a rotational speed corresponding to a high reduction ratio.

In this way, in this embodiment, the first rotary shaft 9 is arranged in series in the axial direction with respect to the rotating shaft 9, which rotates at a required number of rotations depending on the frequency of the supplied power source.
and the second rotating members 27, 33, the first to third external teeth 23, 29, 35 of the fixed ring 39, and the internal tooth member 25
output shaft 19 at the required reduction ratio according to the difference in the number of teeth.
can be rotated. This makes it possible to reduce the size, weight, and cost of the device.

In the above description, the rotating shaft 9 is integrally molded with the rotor 11 from synthetic resin, but the rotating shaft 9 may be made of a separate metal member.

[Effects of the invention] Therefore, the present invention makes it possible to provide an electric motor with a reduction mechanism that can obtain a desired high reduction ratio with a simple configuration, and also reduce the size, weight, and cost of the device. It is.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view schematically showing an electric motor with a speed reduction mechanism according to the present invention, and FIG. 2 is a central vertical sectional view of the electric motor with a speed reduction mechanism. In the figure, 1 is an electric motor with a reduction mechanism, 3 is a cylindrical housing, 5 is a synchronous motor, 7 is a reduction mechanism, 9 is a rotating shaft, 13 is a permanent magnet, 17 is an output gear, 19 is an output shaft, 22 is a connecting member, 25 27 is the internal gear member, 27 is the first rotating member, 31 is the first planetary gear, and 33 is the second
The rotating member 37 is a second planetary gear, and 39 is a fixed ring.

Claims (1)

[Claims for Utility Model Registration] A rotating shaft 9 provided integrally with a rotor 11 having a permanent magnet 13 in a housing 3;
In an electric motor with a reduction mechanism built in, a synchronous motor 5 consisting of an output gear 17 with the number of teeth n ¹ and an excitation coil 20 and a reduction mechanism 7 installed therein, the reduction mechanism 7 has an output rotatably supported by the housing 3. axis 1
9, and internal teeth rotatably supported by the output shaft 19, having internal teeth 21 with n ² teeth formed on the inner peripheral surface and first external teeth 23 having n ³ teeth formed on the output side. Rotating body 22
A first planetary gear 31 is rotatably supported on the output shaft 19 on the output side of the internal rotating body 22, and a first planetary gear 31 that meshes with the first external teeth 23 is rotatably supported on the outer circumferential side. a first rotating member 27 on which second external teeth 29 of ⁿ⁵ are formed, and a first rotating member rotatably supported by the output shaft 19 on the output side of the first rotating member 27 and meshing with the second external teeth 29 on the outer peripheral side. a second rotating member 33 on which a second planetary gear 37 is rotatably supported and third external teeth 35 having n ⁶ teeth are formed on the output side; and an output shaft 19 on the output side of the second rotating member 33. A fixed ring 3 that is fixed and has a third planetary gear 43 rotatably supported on its outer circumferential side that meshes with the third external teeth 35.
9, and the first to third planetary gears 31,
Internal tooth member 25 with number of teeth n ⁴ meshing with 37 and 43, respectively
An electric motor with a speed reduction mechanism, characterized by comprising: