Motor unit with improved heat dissipation capability for use in electric bicycles
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsMasato NISHIMORI, Masafumi KAWAKAMI, Ryohei ADACHI, Fuhito UMEGAKI, Takehiro YAMAGUCHI
Life of this patent
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Abstract
A motor unit for use in an electric bicycle, the motor unit including a motor configured to drive a wheel of the electric bicycle in rotation. The motor unit includes a shell which at least partially houses the motor. The motor includes a rotary shaft, a rotor coupled to the rotary shaft to rotate along with the rotary shaft, and a stator arranged to surround the rotor. The stator is partially resin-molded and has a metallic surface exposed on an outer periphery thereof. A pin is interposed between the shell and the stator.
Claims9
1-20. (canceled)
A motor unit for use in an electric bicycle, the motor unit comprising:
- a motor having a rotary shaft;
- a unit case which at least partially houses the motor, the unit case having a first divided part and a second divided part;
- an input shaft arranged in the unit case to penetrate through the unit case and to be rotatable around an axis;
- an input body arranged around an outer peripheral surface of the input shaft and configured to rotate along with the input shaft;
- an output body arranged along the outer peripheral surface of the input shaft and configured to rotate around the axis upon receiving rotational force of the input body;
- a one-way clutch arranged to be located between the input body and the output body;
- a control board housed in the unit case and configured to control rotation of the motor;
- a first bearing arranged to rotatably support the rotary shaft;
- a bearing holding member arranged to hold the first bearing;
- and
- a second thermally conductive member arranged in the unit case,
- the second divided part having a second heat dissipating portion connected to the control board via the second thermally conductive member,
- a portion of the second divided part constituting the second heat dissipating portion being bulged inward in the unit case,
- the bearing holding member being fixed to the first divided part,
- the input body including:
- a first input body coupled to the input shaft;
- and
- a second input body coupled to the first input body and configured to transmit rotational force to the output body,
- the second input body being arranged radially inside the one-way clutch,
- the output body being arranged radially outside the one-way clutch.
Dependencies are inferred from the claim text.