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US 10,539,208 B2Granted
Power train and motor grader
AssigneeKomatsu Ltd.
InventorTeruya Kubota
Life of this patent
Estimating the term…
Abstract
A power train is provided having a reduced size and weight. A hydraulic motor includes a rotatable output shaft. Wheel bearings rotatably support a rotatable housing relative to a motor housing. A hydraulic clutch mechanism permits or prohibits rotation of a second carrier of a second planetary gear reducer about the center of rotation of the output shaft. The hydraulic clutch mechanism is disposed on the radially inner side relative to the wheel bearings.
Claims6
A power train comprising:
- a hydraulic motor including a rotatable output shaft;
- a motor housing housing the hydraulic motor;
- a rotatable housing rotatable relative to the motor housing about a center of rotation of the output shaft;
- a bearing rotatably supporting the rotatable housing relative to the motor housing;
- a first planetary gear reducer including:
- a first sun gear to which a torque is input from the hydraulic motor,
- a plurality of first planetary gears engaged with the first sun gear,
- a first carrier rotatably supporting the plurality of first planetary gears, and
- a first ring gear provided in the rotatable housing, the first ring gear being engaged with the plurality of first planetary gears;
- a second planetary gear reducer including:
- a second sun gear coupled to the first carrier,
- a plurality of second planetary gears engaged with the second sun gear,
- a second carrier rotatably supporting the plurality of second planetary gears, and
- a second ring gear provided in the rotatable housing, the second ring gear being engaged with the plurality of second planetary gears;
- and
- a clutch disposed on a radially inner side relative to the bearing and configured to permit or prohibit rotation of the second carrier about the center of rotation of the output shaft, wherein
- the hydraulic motor includes a main body supporting the output shaft, and
- the clutch surrounds the main body.
15 more elements
A power train comprising:
- a hydraulic motor including a rotatable output shaft;
- a motor housing housing the hydraulic motor;
- a rotatable housing rotatable relative to the motor housing about a center of rotation of the output shaft;
- a bearing rotatably supporting the rotatable housing relative to the motor housing;
- a first planetary gear reducer including:
- a first sun gear to which a torque is input from the hydraulic motor,
- a plurality of first planetary gears engaged with the first sun gear,
- a first carrier rotatably supporting the plurality of first planetary gears, and
- a first ring gear provided in the rotatable housing, the first ring near being engaged with the plurality of first planetary nears;
- a second planetary gear reducer including:
- a second sun gear coupled to the first carrier,
- a plurality of second planetary gears engaged with the second sun gear,
- a second carrier rotatably supporting the plurality of second planetary gears, and
- a second ring gear provided in the rotatable housing, the second ring gear being engaged with the plurality of second planetary gears;
- a clutch disposed on a radially inner side relative to the bearing and configured to permit or prohibit rotation of the second carrier about the center of rotation of the output shaft;
- and
- an input shaft coupled to the hydraulic motor and configured to input the torque from the hydraulic motor to the first sun gear, wherein
- in an axial direction of the output shaft, the clutch is disposed closer to the hydraulic motor than the input shaft is.
15 more elements
Dependencies are inferred from the claim text.