| 摘要 |
The present invention provides a variable displacement pump including a cylinder member, a piston member slidably received in said cylinder member, a rack rigidly mounted on one of said members and extending parallel to the longitudinal axis of said one member, a pulse motor having an output shaft, said output shaft including a pinion rigidly connected therewith and engaged by said rack, one of said cylinder and piston members being formed with an opening used in both the suction and discharge of a liquid, and check valves disposed respectively between said opening and an upstream source of liquid and between said opening and a downstream discharging system, whereby the displacement of said pump can be controlled by controlling electric input pulses to said pulse motor.
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