초록 ▼

A hydraulic motor which varies its displacement in accordance with varying torque loads on its output shaft. The motor is biased to a low displacement, low torque, high speed mode, and changes to a high displacement, high torque, low speed mode when the torque load on its output shaft increases. The

A hydraulic motor which varies its displacement in accordance with varying torque loads on its output shaft. The motor is biased to a low displacement, low torque, high speed mode, and changes to a high displacement, high torque, low speed mode when the torque load on its output shaft increases. The motor has eccentrically disposed gerotor gears that rotate and orbit relative to each other to expand and contract fluid chambers on opposite sides of a center line of eccentricity. The gerotor gears can change their orientation relative to each other in response to changes in the torque load on the output shaft, changed, in order to change the displacement of the motor.

대표청구항 ▼

A hydraulic motor comprising: an inlet port for receiving high pressure fluid and an exhaust port for exhausting low pressure fluid, fluid displacement means comprising relatively rotatable and orbital gerotor gears, said gerotor gears having intermeshing teeth which define fluid chambers that expan

A hydraulic motor comprising: an inlet port for receiving high pressure fluid and an exhaust port for exhausting low pressure fluid, fluid displacement means comprising relatively rotatable and orbital gerotor gears, said gerotor gears having intermeshing teeth which define fluid chambers that expand and contract as the gerotor gears rotate and orbit relative to each other, an output shaft, means coupling one of said gerotor gears with said output shaft for applying a torque to said output shaft as said gerotor gears rotate and orbit relative to each other, and commutation valve means for directing fluid from said inlet port to some of the fluid chambers defined by said gerotor gears and for directing fluid from other fluid chambers to said exhaust port according to the torque load imposed upon the output shaft, said gerotor gears defining a center line of eccentricity which separates expanding chambers from the contracting chambers as the gears rotate and orbit, said commutation valve means having a center line of commutation that separates the fluid chambers that are being communicated with said inlet port from the fluid chambers that are being communicated with said exhaust port as the gears rotate and orbit, and means associated with said other of said gerotor gears for effecting a change in angular position of said other of gerotor gears with respect to said one of said gerotor gears in response to a change in a torque load on said output shaft for enabling a change in the orientation of the center line of eccentricity of the gear set relative to the center line of commutation of the commutation valve means to thereby change the displacement of said hydraulic motor.