Hydraulic piston pump with throttle control

摘要

A pump system has a piston pump. The piston pump has a cylinder block with an inlet port, an outlet port, and a plurality of cylinders. Each cylinder in the plurality of cylinders is connected to the inlet port by an inlet passage and to the outlet port by an outlet passage. The piston pump has a plurality of pistons disposed in the plurality of cylinders. A drive shaft drives the pistons within the cylinders. A throttle member independently throttles flow in each inlet passage. The pump system has an electrohydraulic actuator governing movement of the throttle member.

主权项

1. A pump system comprising:
a piston pump comprising
a cylinder block having an inlet port, an outlet port, and a plurality of cylinders disposed therein, each cylinder in the plurality of cylinders being connected to the inlet port by a respective inlet passage in a plurality of inlet passages and to the outlet port by a respective outlet passage in a plurality of outlet passages;a plurality of inlet valves, each inlet valve in the plurality of inlet valves located in a respective inlet passage in the plurality of inlet passages and allowing flow from the inlet port into a respective cylinder in the plurality of cylinders and restricting flow from the respective cylinder in the plurality of cylinders into the inlet port;a plurality of pistons, each piston in the plurality of pistons being disposed in a respective cylinder in the plurality of cylinders;a drive shaft driving the plurality of pistons within the respective cylinders; anda throttle mechanism having a throttle member independently throttling flow in each inlet passage in the plurality of inlet passages;wherein the throttle mechanism is located between the inlet port and each inlet valve located in its respective inlet passage, such that a fluid volume between the throttle mechanism and each inlet valve can be consistently controlled due to proximity of the throttle mechanism to each inlet valve; and an electrohydraulic actuator governing movement of the throttle member.