Deceleration device
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.
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.