In-wheel motor driving device

摘要

In an in-wheel motor driving device, since an involute speed reduction gear with a small difference in number of teeth which can be made small in size can be disposed on an inner side of an inner rotor type motor, a size of the in-wheel motor driving device in the direction of a rotational axis can be reduced. Further, in the inner rotor type motor, since a first stator is disposed so as to face a radially outer side of a large-diameter rotor, heat generated in the first stator is easily dissipated. On the other hand, in an outer rotor type motor, since a second stator is disposed so as to face a radially inner side of a small-diameter rotor, a torque radius of the small-diameter rotor can be made large, thereby making it possible to ensure a large torque capacity. Because of this, the outer rotor type motor can be made smaller in diameter than the inner rotor type motor, thereby making it possible to ensure a large space within a wheel.

主权项

1. An in-wheel motor driving device comprising:
a motor unit which is incorporated within a wheel of a vehicle and which includes a motor and a speed reduction gear; and a control device which is configured to control driving of the motor, wherein the motor includes: a cylindrical rotor; a cylindrical first stator which is disposed so as to face a radially outer side of the rotor; and a cylindrical second stator which is disposed so as to face a radially inner side of the rotor and which is disposed so as to be deviated in a direction of a rotational axis relative to the first stator, and the speed reduction gear is disposed on the radially inner side of the rotor and on a radially inner side of the first stator, wherein an output side end portion of the second stator is located at an inner side of an output side end portion of the first stator along the direction of the rotational axis, an output side end portion of the rotor and the output side end portion of the first stator are located at the substantially same position along the direction of the rotational axis, the second stator is located at a radially inner side of the first stator, and the speed reduction gear is located at the radially inner side of the rotor, and at the output side end portion of the rotor along the direction of the rotational axis, and is adjacent to the second stator.