| 摘要 |
Improvements in trunnion shaft-controlled swashplate axial hydraulic piston pumps as well as hydraulic systems used in hydrostatic transmissions utilized. e.g., in zero-turn-radius (ZTR) wheeled vehicles, such as grass mowers, with one embodiment thereof pertaining to, in combination, the noted pump, devoid of any internal servo control, and a reversible power actuator, for controlling the angle of the swashplate, externally affixed to the housing containing the pump and operatively interconnected with an end of the trunnion shaft extending from the pump housing, with the power actuator being one of a rotary actuator, a fluid power axial cylinder and a rotary electronic actuator. Usage in a ZTR wheeled vehicle requires the prime mover to independently drive two hydraulic transmissions that are controlled by a human operator via a mechanical lever, either two single-axis or one dual-axis joystick control, or a steer-by-wire unit, connected with right and left power actuators
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