Wheel unit
First Claim
1. A wheel unit, comprising:
- a motor;
a pinion gear which is fixed to a rotating portion of the motor;
a wheel which includes an annular ground surface and rotates about a final gear support shaft;
a final gear made of a resin, which is fixed to the wheel directly or via another member and is 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; and
a gear case which accommodates the pinion gear, the speed reduction mechanism, and the final gear;
whereina 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 is provided between the final gear and the wheel;
an outside diameter of the rotation support portion is greater than an outside diameter of the final gear support shaft; and
at least a portion of the final gear is positioned on an inside of a cylindrical or substantially cylindrical area surrounded by the ground surface.
1 Assignment
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Accused Products
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 about a final gear support shaft, a final gear fixed to the wheel directly or via another member, 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, the speed reduction mechanism, and the final gear. A rotation support portion rotating along with the final gear and the wheel while being supported by the gear case is provided between the final gear and the wheel. An outside diameter of the rotation support portion is greater than an outside diameter of the final gear support shaft.
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Citations
16 Claims
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1. A wheel unit, comprising:
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a motor; a pinion gear which is fixed to a rotating portion of the motor; a wheel which includes an annular ground surface and rotates about a final gear support shaft; a final gear made of a resin, which is fixed to the wheel directly or via another member and is 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; and a gear case which accommodates the pinion gear, the speed reduction mechanism, and the final gear;
whereina 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 is provided between the final gear and the wheel; an outside diameter of the rotation support portion is greater than an outside diameter of the final gear support shaft; and at least a portion of the final gear is positioned on an inside of a cylindrical or substantially cylindrical area surrounded by the ground surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification