Wheel oil supply device and wheel driving device

1. A wheel oil supply device, which is assigned to a wheel of a vehicle, comprising:

an oil supply pathway for supplying oil to a hub bearing, which rotatably supports a hub connected to a disk wheel of said wheel,

an oil seal which is interposed between said hub bearing and a region outside of the hub bearing to seal the oil supplied to said hub bearing through said oil supply pathway, and

a dust seal which is interposed between said hub bearing and said region outside of the hub bearing to seal a dust which flows from said region outside of the hub bearing to said hub bearing, and

an oil guiding pathway which comprises a space that is comparted by said oil seal and said dust seal and a communicating pathway that makes said space communicate with a predetermined discharge region and thereby, when the oil supplied to said hub bearing leaks to said space through said oil seal, guides the oil to said discharge region, and prevents a pressure difference between said hub bearing and said region outside of the hub bearing from generating due to a negative pressure resulting from the rotation of said hub.

2. The wheel oil supply device according to claim 1 , wherein:

said discharge region is disposed in a region other than a braking mechanism which gives a braking force to said wheel.

3. The wheel oil supply device according to claim 2 , wherein:

said discharge region is an oil reservoir which stores oil to be supplied to said hub bearing.

4. A wheel driving device which drives a wheel of a vehicle, comprising:

an electric in-wheel motor which is disposed as a driving source of said wheel,

a hub which is connected with a disk wheel of said wheel and rotated by the driving force of said in-wheel motor,

a hub bearing which rotatably supports said hub,

a first oil supply mechanism for supplying oil to said in-wheel motor, and

a second oil supply mechanism for supplying oil to said hub bearing, and

wherein:

said second oil supply mechanism is constituted by the wheel oil supply device according to claim 3 .

5. A wheel driving device which drives a wheel of a vehicle, comprising:

an electric in-wheel motor which is disposed as a driving source of said wheel,

a hub which is connected with a disk wheel of said wheel and rotated by the driving force of said in-wheel motor,

a hub bearing which rotatably supports said hub,

a first oil supply mechanism for supplying oil to said in-wheel motor, and

a second oil supply mechanism for supplying oil to said hub bearing, and

wherein:

said second oil supply mechanism is constituted by the wheel oil supply device according to claim 2 .

6. The wheel oil supply device according to claim 1 , wherein:

said discharge region is an oil reservoir which stores oil to be supplied to said hub bearing.

7. A wheel driving device which drives a wheel of a vehicle, comprising:

an electric in-wheel motor which is disposed as a driving source of said wheel,

a hub which is connected with a disk wheel of said wheel and rotated by the driving force of said in-wheel motor,

a hub bearing which rotatably supports said hub,

a first oil supply mechanism for supplying oil to said in-wheel motor, and

a second oil supply mechanism for supplying oil to said hub bearing, and

wherein:

said second oil supply mechanism is constituted by the wheel oil supply device according to claim 6 .

8. A wheel driving device which drives a wheel of a vehicle, comprising:

an electric in-wheel motor which is disposed as a driving source of said wheel,

a hub which is connected with a disk wheel of said wheel and rotated by the driving force of said in-wheel motor,

a hub bearing which rotatably supports said hub,

a first oil supply mechanism for supplying oil to said in-wheel motor, and

a second oil supply mechanism for supplying oil to said hub bearing, and

wherein:

said second oil supply mechanism is constituted by the wheel oil supply device according to claim 1 .