Hydrostatic continuously variable transmission

Details Hydrostatic continuously variable transmission Hydrostatic continuously variable transmission

1987-10-22

1989-05-09

Look, Edward K.

Power plants

Pressure fluid source and motor

Input pump and rotary output motor system having...

60487, F16D 3900

Patent

active

048277215

ABSTRACT:
In a hydrostatic continuously variable transmission comprising a swashplate type hydraulic pump having a pump swashplate and annularly arranged pump plungers whose suction and discharge strokes are provided by the pump swashplate, a swashplate type hydraulic motor having a motor swashplate and annularly arranged motor plungers whose expansion and shrinkage strokes are provided by the motor swashplate, and a hydraulic closed circuit formed between the hydraulic pump and motor, the middle point of a discharge region of the hydraulic pump is angularly delayed at a given angle in a direction of rotation of the hydraulic pump relative to a tilting axis of the pump swashplate, and/or the middle, point of an expansion region of the hydraulic motor is angularly advanced at a given angle in a direction of rotation of the hydraulic motor relative to a tilting axis of the motor swashplate. Further, a suction region of the hydraulic pump is set at an angle larger than that of a discharge region thereof, and/or a shrinkage region of the hydraulic motor is set at an angle larger than that of an expansion region thereof.

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G. Niemann, "Maschinenelemente," 1983, pp. 68, 82 & 83.

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