Electric motor with compound planetary gear drive
AssigneeHydro-Gear Limited Partnership
InventorsNathan W. Bonny, Thomas J. Langenfeld
Life of this patent
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Abstract
A reduction drive has an electric motor and an output hub rotatable with respect to a motor housing. A planetary gear reduction assembly is disposed entirely within an internal volume formed by the output hub and includes a first ring gear fixed to and rotating with the output hub, a second ring gear fixed to a portion of the main housing, a sun gear driven by the motor shaft, and gears mounted on a carrier assembly and driven by the sun gear. Each planet gear has a first stage gear driving the first ring gear, and a second stage gear engaged to the second ring gear.
Claims20
A reduction drive assembly, comprising:
- an electric motor disposed in a motor housing and driving a motor output shaft, the motor output shaft having a first spline at a proximal end thereof and a second spline at a distal end thereof;
- a brake assembly comprising a brake housing engaged to the motor housing, a brake rotor engaged to the first spline of the motor output shaft and at least one brake stator;
- an output hub that is disposed adjacent to a main housing and is rotatable with respect to the motor housing, the output hub forming an internal volume;
- a planetary gear reduction assembly disposed entirely within the internal volume of the output hub, the planetary gear reduction assembly comprising:
- a first ring gear connected to the output hub to rotate therewith;
- and
- a first carrier plate engaged to a second carrier plate to form a carrier assembly;
- a second ring gear non-rotatably fixed to a portion of the main housing;
- a sun gear engaged to and driven by the motor output shaft;
- and
- a plurality of planet gears mounted on the carrier assembly and driven by the sun gear, each of the plurality of planet gears having a first stage gear form engaged to and driving the first ring gear, and a second stage gear form engaged to the second ring gear.
A reduction drive assembly, comprising:
- an electric motor disposed in a motor housing and driving a motor output shaft, the motor output shaft having a first spline at a proximal end thereof and a second spline at a distal end thereof, and wherein the motor output shaft has a first diameter adjacent the proximal end, and a second diameter adjacent the distal end, wherein the second diameter is less than the first diameter;
- a brake assembly comprising a brake housing engaged to the motor housing, a brake rotor engaged to the first spline of the motor output shaft, and at least one brake stator;
- an output hub that is disposed adjacent to a main housing and is rotatable with respect to the motor housing, the output hub forming an internal volume;
- a first ring gear connected to the output hub to rotate therewith;
- a first carrier plate engaged to a second carrier plate to form a carrier assembly;
- a second ring gear non-rotatably fixed to a portion of the main housing by a plurality of fasteners extending through a portion of the second ring gear;
- a sun gear supported in the carrier assembly and engaged to and driven by the motor output shaft;
- and
- a plurality of planet gears mounted on the carrier assembly and driven by the sun gear, each of the plurality of planet gears having a first stage gear form engaged to and driving the first ring gear, and a second stage gear form engaged to the second ring gear, wherein the carrier assembly, the plurality of planet gears, the sun gear, the first ring gear and the second ring gear are all disposed within the internal volume of the output hub.
Dependencies are inferred from the claim text.