Geared motor

Patent metadata

Field	Value
Publication number	US-10619675-B2
Application number	US-201615766722-A
Country	US
Kind code	B2
Filing date	Oct 31, 2016
Priority date	Nov 9, 2015
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

Provided is a geared motor with which a large torque can be obtained without an increase in size. In this geared motor ( 1 ), an output member ( 8 ) having a helical groove ( 83 ) formed in an outer circumferential section is provided between a first plate part ( 31 ) and a second plate part ( 32 ) of a frame ( 3 ), and the rotation of a motor pinion ( 55 ) fixed to a rotary shaft ( 50 ) is reduced in speed by transmission gears of a reduction gear mechanism ( 9 ) and is transmitted to a gear part ( 85 ) of the output member ( 8 ). Thus, a large torque can be output, even when the gear part ( 85 ) of the output member ( 8 ) is made smaller than the outer diameter of the section ( 84 ) provided with the helical groove ( 83 ). Also, even when a gear cover ( 7 ) is provided, a lateral plate part ( 72 ) of the gear cover ( 7 ) covering the outer circumferential section of the gear part ( 85 ) of the output member ( 8 ) is located close to the rotation center axis of the output member ( 8 ). Thus, it is possible to prevent the geared motor ( 1 ) from being increased in size by the gear cover ( 7 ).

First claim

The invention claimed is:

1. A geared motor comprising:
a motor main body;
a frame comprising:
a first plate part which is fixed to an end part on one side in a motor axial line direction of the motor main body;
a second plate part which faces the first plate part on an opposite side to the motor main body; and
a third plate part which connects the first plate part with the second plate part;
a first fixed shaft which is disposed between the first plate part and the second plate part;
an output member comprising:
a shaft hole through which the first fixed shaft is penetrated; and
a gear part and a spiral groove which are provided on an outer peripheral portion of the output member in order from one other side to the one side in the motor axial line direction;
a second fixed shaft whose shaft end part on the other side is held by the first plate part;
a motor pinion which is fixed to a rotation shaft of the motor main body;
a transmission gear which is rotatably supported by the second fixed shaft and decelerates rotation of the motor pinion to transmit to the gear part; and
a gear cover which is fixed to the frame between the first plate part and the second plate part;
wherein the gear cover comprises:
an end plate part which covers the motor pinion, the transmission gear and the gear part on the one side; and
a side plate part which covers an outer peripheral portion of the gear part from an opposite side to the transmission gear;
wherein the end plate part comprises an opening part from which a portion provided with the spiral groove of the output member is protruded to the one side; and
wherein an outer diameter of the gear part is smaller than an outer diameter of the portion provided with the spiral groove.

2. The geared motor according to claim 1 , wherein the side plate part is overlapped with the first plate part in the motor axial line direction.

3. The geared motor according to claim 2 , wherein the end plate part comprises a second fixed shaft support hole which supports a shaft end part on the one side of the second fixed shaft.

4. The geared motor according to claim 3 , wherein the gear cover comprises an engaging part which is engaged with the frame when the gear cover is disposed between the first plate part and the second plate part.

5. The geared motor according to claim 3 , wherein the gear cover comprises a first cover member and a second cover member which is adjacent to the first cover member.

6. The geared motor according to claim 5 , wherein the first cover member comprises a first end plate part structuring a part of the end plate part, and the second fixed shaft support hole is provided in the first end plate part.

7. The geared motor according to claim 6 , wherein at least the first cover member comprises an engaging part which is engaged with the frame.

8. The geared motor according to claim 6 , wherein the second cover member comprises a second end plate part which structures a portion of the end plate part adjacent to the first end plate part, and the opening part is structured of a first cut-out part which is formed at an end part of the first end plate part on a side of the second end plate part, and a second cut-out part which is formed at an end part of the second end plate part on a side of the first end plate part.

9. The geared motor according to claim 2 , wherein the gear cover comprises:
a first cover member provided with a first end plate part which structures a part of the end plate part; and
a second cover member provided with a second end plate part which structures a portion of the end plate part adjacent to the first end plate part, and
the opening part is structured of a first cut-out part formed in the first end plate part and a second cut-out part formed in the second end plate part.

10. The geared motor according to claim 9 , wherein the opening part is circular, and each of the first cut-out part and the second cut-out part is semicircular.

11. The geared motor according to claim 1 , wherein the end plate part comprises a second fixed shaft support hole which supports a shaft end part on the one side of the second fixed shaft.

12. The geared motor according to claim 11 , wherein the gear cover comprises an engaging part which is engaged with the frame when the gear cover is disposed between the first plate part and the second plate part.

13. The geared motor according to claim 11 , wherein the gear cover comprises a first cover member and a second cover member which is adjacent to the first cover member.

14. The geared motor according to claim 13 , wherein the first cover member comprises a first end plate part structuring a part of the end plate part, and the second fixed shaft support hole is provided in the first end plate part.

15. The geared motor according to claim 14 , wherein at least the first cover member comprises an engaging part which is engaged with the frame.

16. The geared motor according to claim 14 , wherein the second cover member comprises a second end plate part which structures a portion of the end plate part adjacent to the first end plate part, and the opening part is structured of a first cut-out part which is formed at an end part of the first end plate part on a side of the second end plate part, and a second cut-out part which is formed at an end part of the second end plate part on a side of the first end plate part.

17. The geared motor according to claim 16 , wherein the opening part is circular, and each of the first cut-out part and the second cut-out part is semicircular.

18. The geared motor according to claim 11 , wherein the gear cover comprises:
a first cover member provided with a first end plate part which structures a part of the end plate part; and
a second cover member provided with a second end plate part which structures a portion of the end plate part adjacent to the first end plate part, and
the opening part is structured of a first cut-out part formed in the first end plate part and a second cut-out part formed in the second end plate part.

19. The geared motor according to claim 18 , wherein the opening part is circular, and each of the first cut-out part and the second cut-out part is semicircular.

20. The geared motor according to claim 1 , wherein the gear cover comprises:
a first cover member provided with a first end plate part which structures a part of the end plate part; and
a second cover member provided with a second end plate part which structures a portion of the end plate part adjacent to the first end plate part, and
the opening part is structured of a first cut-out part formed in the first end plate part and a second cut-out part formed in the second end plate part.

21. The geared motor according to claim 20 , wherein the opening part is circular, and each of the first cut-out part and the second cut-out part is semicircular.

Assignees

• Denso Corp
• Nidec Sankyo Corp

Inventors

• Yamaoka Mamoru
• Miyazawa Tetsuo
• Aizawa Koji

Classifications

• H02K7/116 Primary

  with gears · CPC title

• H02K37/14

  with magnets rotating within the armatures · CPC title

• F16C2380/27

  Motor coupled with a gear, e.g. worm gears · CPC title

• H02K37/24

  Structural association with auxiliary mechanical devices · CPC title

• F16C35/10 Primary

  with sliding-contact bearings · CPC title