Deceleration device

Patent metadata

Field	Value
Publication number	US-11035458-B2
Application number	US-201916541204-A
Country	US
Kind code	B2
Filing date	Aug 15, 2019
Priority date	Sep 13, 2018
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A deceleration device includes a reduction assembly that reduces speed, a motor attached to the reduction assembly, the motor being rotatable about a central axis line, and a heat insulator having a heat conduction coefficient of about 0.04 W/mK or less, the heat insulator being positioned between the motor and the reduction assembly. A surface temperature of an exposed portion of the motor is maintained at a low level, with a simple structure, that prevents burns to human skin in contact with the motor.

First claim

What is claimed is:

1. A deceleration device comprising:
a reduction assembly that reduces speed;
a motor attached to the reduction assembly and rotatable about a central axis line; and
a heat insulator having a heat conduction coefficient of about 0.04 W/mK or less and being positioned between the motor and the reduction assembly; wherein
at least two hoes are provided in the heat insulator.

2. The deceleration device according to claim 1 , wherein the motor is an axial flux motor.

3. The deceleration device according to claim 1 , wherein a thickness of the heat insulator is smaller than about 5 mm.

4. The deceleration device according to claim 1 , wherein an outer diameter of the heat insulator is equivalent to or smaller than an outer diameter of the motor.

5. The deceleration device according to claim 1 , wherein when viewed in an axial direction, an area of the heat insulator is at least about 30% of an area of a portion where the reduction assembly and the motor oppose each other in the axial direction.

6. The deceleration device according to claim 1 , wherein the heat insulator is made of at least either one of fiber, resin, and polystyrene foam.

7. The deceleration device according to claim 1 , wherein the heat insulator has an annular shape or a polygonal shape.

8. The deceleration device according to claim 1 , wherein the reduction assembly includes at least one of an annular gear, a planetary gear, and a sun gear.

9. A deceleration device according to claim 1 , wherein a heat insulating material is applied to an outer surface of the heat insulator.

10. The deceleration device according to claim 1 , wherein the at least two holes each have a round shape.

Assignees

• Nidec Corp

Inventors

• Vu Ha Hai
• Chen Chien Yu

Classifications

• H02K9/223

  Heat bridges · CPC title

• F16H57/0486 Primary

  with fixed gear ratio  (axle or inter-axle differentials F16H57/0483) · CPC title

• F16H57/0419 Primary

  Thermal insulations · CPC title

• H02K7/116

  with gears · CPC title