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A wheel assembly with an in-wheel motor in which a wheel driving apparatus formed of a motor or a combination of a motor and a reduction mechanism is provided in a wheel, includes an oil supply apparatus that is driven by rotational output of the motor, and an oil supply flow path that leads oil tha

A wheel assembly with an in-wheel motor in which a wheel driving apparatus formed of a motor or a combination of a motor and a reduction mechanism is provided in a wheel, includes an oil supply apparatus that is driven by rotational output of the motor, and an oil supply flow path that leads oil that has been drawn up by the oil supply apparatus to the wheel driving apparatus. The oil supply apparatus is structured so that oil can be supplied to the wheel driving apparatus via the oil supply flow path when the motor is rotating in the forward direction as well as when the motor is rotating in the reverse direction.

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1. A wheel assembly with an in-wheel motor comprising: a rotor arranged on an inner peripheral side of a stator;a driving gear coupled to an output shaft of the rotor;a counter gear in mesh with the driving gear, wherein the counter gear has a larger diameter than a diameter of the driving gear;an o

1. A wheel assembly with an in-wheel motor comprising: a rotor arranged on an inner peripheral side of a stator;a driving gear coupled to an output shaft of the rotor;a counter gear in mesh with the driving gear, wherein the counter gear has a larger diameter than a diameter of the driving gear;an oil supply apparatus that is driven by output of a forward rotation and a reverse rotation of the motor via the counter gear,wherein the oil supply apparatus draws up oil from an oil tank via a suction path and supplies the oil to the in-wheel motor when the motor is rotating in a forward direction as well as when the motor is rotating in a reverse direction, andwherein the counter gear extends radially around the oil supply apparatus. 2. The wheel assembly with an in-wheel motor according to claim 1, wherein the oil supply apparatus includes a piston pump. 3. The wheel assembly with an in-wheel motor according to claim 2, wherein the piston pump includes an eccentric cam that is rotatably driven by rotational output of the motor, and a piston that moves in a reciprocating manner in conjunction with the rotation of the eccentric cam. 4. The wheel assembly with an in-wheel motor according to claim 3, wherein the eccentric cam is connected to the counter gear on a vehicle inside portion. 5. The wheel assembly with an in-wheel motor according to claim 1, wherein the oil supply apparatus includes a centrifugal pump. 6. The wheel assembly with an in-wheel motor according to claim 1, wherein the oil supply apparatus includes a pump that discharges oil in one direction when the motor is rotating in the forward direction and discharges the oil in another direction when the motor is rotating in the reverse direction; two systems of flow paths corresponding to the different directions in which the pump discharges the oil; and a communication control apparatus that controls the communicating state of the two systems of flow paths with respect to the pump. 7. The wheel assembly with an in-wheel motor according to claim 6, wherein a first system from among the two systems of flow paths includes an outlet side connecting flow path that communicates an outlet port of the pump during forward rotation with an oil supply flow path to the in-wheel motor, and an inlet side connecting flow path that communicates an inlet port of the pump during forward rotation with the oil tank; a second system from among the two systems of flow paths includes an outlet side connecting flow path that communicates an outlet port of the pump during reverse rotation with the oil supply flow path, and an inlet side connecting flow path that communicates an inlet port of the pump during reverse rotation with the oil tank; and the communication control apparatus includes a check valve provided for each outlet side connecting flow path of the first system and the second system and each inlet side connecting flow path of the first system and the second system. 8. The wheel assembly with an in-wheel motor according to claim 6, wherein a first system from among the two systems of flow paths includes an outlet side connecting flow path that communicates an outlet port of the pump during forward rotation with an oil supply flow path to the in-wheel motor, and an inlet side connecting flow path that communicates an inlet port of the pump during forward rotation with the oil tank; a second system from among the two systems of flow paths includes an outlet side connecting flow path that communicates an outlet port of the pump during reverse rotation with the oil supply flow path, and an inlet side connecting flow path that communicates an inlet port of the pump during reverse rotation with the oil tank; and the communication control apparatus includes a check valve provided for each outlet side connecting flow path of the first system and the second system, and a directional control valve that selectively communicates one of the inlet side connecting flow paths of the first system and the second system with the oil tank. 9. The wheel assembly with an in-wheel motor according to claim 1, wherein the oil supply apparatus includes a pump that discharges oil in one direction when the motor is rotating in the forward direction and discharges the oil in another direction when the motor is rotating in the reverse direction; and the pump has a rotating member that rotates together with the forward rotation and the reverse rotation of the motor. 10. The wheel assembly with an in-wheel motor according to claim 1, wherein the oil supply apparatus includes a pump that discharges oil in one direction when the motor is rotating in the forward direction and discharges the oil in another direction when the motor is rotating in the reverse direction; the pump includes a movable port member that defines an outlet port and an inlet port; and the movable port member moves, in conjunction with the forward rotation and the reverse rotation of the motor, between a first position and a second position in which the outlet port and the inlet port are reversed. 11. The wheel assembly with an in-wheel motor according to claim 10, wherein the pump is a gear pump, the movable port member is arranged on a gear side surface of the gear pump and moves between the first position and the second position in conjunction with the forward rotation and reverse rotation of the motor via friction between the movable port member and the gear side surface of the gear pump, and the pump includes a restricting portion that restricts the movement of the movable port member to the first position and the second position. 12. The wheel assembly with an in-wheel motor according to claim 10, wherein the pump includes a fixed case in which is formed an outlet hole that is connected to an oil supply flow path to the in-wheel motor and an inlet hole that is communicated with the oil tank; the movable port member is arranged within the case; and the movable port member and the case are structured such that the outlet port of the movable port member is communicated with the outlet hole of the case and the inlet port of the movable port member is communicated with the inlet hole of the case when the movable port member is in the first position as well as the second position. 13. The wheel assembly with an in-wheel motor according to claim 12, wherein the movable port member has an arc-shaped protruding portion that has a larger radius than another portion of the movable port member; and an inner peripheral surface of the case is formed by a first inner peripheral surface that has a radius that corresponds to the outer radius of the protruding portion of the movable port member, a second inner peripheral surface that has a smaller radius than the first inner peripheral surface, and a third inner peripheral surface that has a smaller radius than the second inner peripheral surface. 14. The wheel assembly with an in-wheel motor according to claim 13, wherein the second inner peripheral surface is formed on both sides of the third inner peripheral surface so as to sandwich the third inner peripheral surface, and the outlet hole and the inlet hole are each formed in the second inner peripheral surface. 15. The wheel assembly with an in-wheel motor according to claim 1, wherein a sun gear is formed on one end of a shaft and the counter gear is formed on an other end of the shaft in a width direction of the vehicle. 16. The wheel assembly with an in-wheel motor according to claim 15, wherein the one end of the shaft on which the sun gear is formed is rotatably supported by a knuckle via a bearing. 17. The wheel assembly with an in-wheel motor according to claim 15, wherein the oil from the oil supply apparatus is output to an oil supply flow path provided axially to the shaft. 18. The wheel assembly with an in-wheel motor according to claim 1, wherein the counter gear includes an outer circumferential portion that meshes with the driving gear, and wherein the oil supply apparatus is inside the counter gear in a radial direction from the outer circumferential portion. 19. A wheel assembly with an in-wheel motor comprising: a rotor arranged on an inner peripheral side of a stator;a driving gear coupled to an output shaft of the rotor;a counter gear in mesh with the driving gear, wherein the counter gear has a larger diameter than a diameter of the driving gear;an oil supply apparatus that is driven by output of a forward rotation and a reverse rotation of the motor via the counter gear, whereinthe oil supply apparatus is formed such that oil in an oil tank is supplied to the in wheel motor when the motor is rotating in a forward direction as well as when the motor is rotating in a reverse direction,the oil supply apparatus includes a piston pump,the piston pump includes an eccentric cam that is rotatably driven by rotational output of the motor, and a piston that moves in a reciprocating manner in conjunction with the rotation of the eccentric cam,a sun gear is formed on one end of a shaft and the counter gear is formed on an other end of the shaft in a width direction of the vehicle, and the oil supply apparatus is provided radially inward from the counter gear. 20. The wheel assembly with an in-wheel motor according to claim 19, wherein the eccentric cam is connected to the shaft on a vehicle inside portion.