Wheel unit
AssigneeNidec Corporation
InventorTadayuki Kanatani
Life of this patent
Estimating the term…
Abstract
A wheel unit includes a motor, a pinion gear fixed to a rotating portion of the motor, a wheel including an annular ground surface and rotating around a final gear support shaft, and a final gear disposed on one side in an axial direction with respect to the wheel. The wheel unit further includes a speed reduction mechanism which decelerates rotation of the pinion gear and transmits the rotation to the final gear and a gear case which accommodates the pinion gear. When viewed from the axial direction, the final gear support shaft and the motor shaft are disposed in different positions. The motor includes a stationary portion and a rotary portion, and the stationary portion is fixed to the gear case by an attachment plate.
Claims16
A wheel unit, comprising:
- a motor including a motor shaft;
- a pinion gear which is fixed to a rotating portion of the motor;
- a wheel which includes an annular ground surface and rotates around a final gear support shaft;
- a final gear made of a resin, fixed to the wheel directly or via another member and disposed on one side in an axial direction with respect to the wheel;
- a speed reduction mechanism which decelerates rotation of the pinion gear and transmits the rotation to the final gear;
- a gear case which accommodates the pinion gear, the speed reduction mechanism, and the final gear;
- and
- a rotation support portion which rotates along with the final gear and the wheel while being supported by the gear case directly or via another member and is provided between the final gear and the wheel;
- wherein
- when viewed from one side in the axial direction, the final gear support shaft and the motor shaft are disposed in different positions;
- the motor includes a rotor magnet on an outside of an armature in a radial direction;
- the motor includes a stationary portion, and a rotary portion which rotates relative to the stationary portion;
- and
- the stationary portion is fixed to the gear case by an attachment plate;
- the gear case includes a circular hole portion including a cylindrical inner peripheral surface which supports the rotation support portion;
- the inner peripheral surface of the circular hole portion of the gear case contacts with an outer peripheral surface of the rotation support portion with lubricant interposed therebetween;
- and
- an outside diameter of the rotation support portion is greater than an outside diameter of the final gear support shaft.
A wheel unit, comprising:
- a motor including a motor shaft;
- a pinion gear which is fixed to a rotating portion of the motor;
- a wheel which includes an annular ground surface and rotates around a final gear support shaft;
- a final gear made of a resin, fixed to the wheel directly or via another member and disposed on one side in an axial direction with respect to the wheel;
- a speed reduction mechanism which decelerates rotation of the pinion gear and transmits the rotation to the final gear;
- a gear case which accommodates the pinion gear, the speed reduction mechanism, and the final gear;
- and
- a rotation support portion which rotates along with the final gear and the wheel while being supported by the gear case directly or via another member and is provided between the final gear and the wheel;
- wherein
- when viewed from one side in the axial direction, the final gear support shaft and the motor shaft are disposed in different positions;
- the motor includes a rotor magnet on an outside of an armature in a radial direction;
- the motor includes a stationary portion, and a rotary portion which rotates relative to the stationary portion;
- the stationary portion is fixed to the gear case by an attachment plate;
- the gear case includes a bottom surface including a flat surface or a curved surface which has a bigger curvature radius than the ground surface of the wheel, and
- the motor is disposed on an upper side above the bottom surface.
Dependencies are inferred from the claim text.