In-wheel motor drive device

1. An in-wheel motor driving device comprising a motor section including an output shaft; a wheel hub bearing section; a speed reducer section; and a wheel braking device; the output shaft of the motor section being coaxially connected with the wheel hub bearing section via the speed reducer section;

wherein:

the wheel braking device is a drum brake including a brake drum which is fastened to a hub ring in the wheel hub bearing section; and a back plate which is disposed on a fixing-ring side of the wheel hub bearing section,

the back plate of the drum brake is formed integrally with an outboard-side end member, which is made of an iron or steel material and fastened to an outboard-side end surface of an aluminum alloy housing of the speed reducer section,

the outboard-side end member is formed with bolt holes for bolts to fasten a fixing ring of the wheel hub bearing section, and

the outboard-side end member is fastened to the aluminum alloy housing of the speed reducer section on an outer diameter side of the speed reducer section using the bolts.

2. The in-wheel motor driving device according to claim 1 , wherein the fixing ring of the wheel hub bearing section and the outboard-side end member are formed integrally with each other.

3. The in-wheel motor driving device according to claim 1 , wherein the outboard-side end member has a knuckle formed integrally therewith, the knuckle being connected only with a lower arm extending from a car body.

4. The in-wheel motor driving device according to claim 1 , wherein the outboard-side end member has a knuckle formed integrally therewith, the knuckle being connected with an upper arm and a lower arm extending from a car body.

5. The in-wheel motor driving device according to claim 1 , wherein the outboard-side end member has a knuckle formed integrally therewith, an upper side of the knuckle being connected with a buffering device.

6. The in-wheel motor driving device according to claim 1 , wherein a sealing member is disposed between the outboard-side end member and the aluminum alloy housing of the speed reducer section for prevention of oil leakage from inside.

7. The in-wheel motor driving device according to claim 6 , wherein the sealing member is an O ring.

8. A vehicle comprising the in-wheel motor driving device according to claim 1 .

9. An in-wheel motor driving device comprising a motor section including an output shaft; a wheel hub bearing section; a speed reducer section; and a wheel braking device; the output shaft of the motor section being coaxially connected with the wheel hub bearing section via the speed reducer section;

wherein:

the wheel braking device is a disc brake including a brake disc which is fastened to a hub ring in the wheel hub bearing section; and calipers which are disposed on a fixing-ring side of the wheel hub bearing section,

the calipers have a mounting member which is formed integrally with an outboard-side end member, which is made of an iron or steel material and fastened to an outboard-side end surface of an aluminum alloy housing of the speed reducer section,

the outboard-side end member is formed with bolt holes for bolts to fasten a fixing ring of the wheel hub bearing section, and

the outboard-side end member is fastened to the aluminum alloy housing of the speed reducer section on an outer diameter side of the speed reducer section using the bolts.

10. The in-wheel motor driving device according to claim 9 , wherein the fixing ring of the wheel hub bearing section and the outboard-side end member are formed integrally with each other.

11. The in-wheel motor driving device according to claim 9 , wherein the outboard-side end member has a knuckle formed integrally therewith, the knuckle being connected only with a lower arm extending from a car body.

12. The in-wheel motor driving device according to claim 9 , wherein the outboard-side end member has a knuckle formed integrally therewith, the knuckle being connected with an upper arm and a lower arm extending from a car body.

13. The in-wheel motor driving device according to claim 9 , wherein the outboard-side end member has a knuckle formed integrally therewith, an upper side of the knuckle being connected with a buffering device.

14. The in-wheel motor driving device according to claim 9 , wherein a sealing member is disposed between the outboard-side end member and the aluminum alloy housing of the speed reducer section for prevention of oil leakage from inside.

15. A vehicle comprising the in-wheel motor driving device according to claim 9 .