Pumping element for hydraulic pump

Details Pumping element for hydraulic pump Pumping element for hydraulic pump

2005-12-13

2005-12-13

Koczo, Jr., Michael (Department: 3746)

Pumps

With condition responsive pumped fluid control

Variable cutoff or pumping member controlled port

C123S449000

Reexamination Certificate

active

06974312

ABSTRACT:
A pumping element for a hydraulic pump is provided. The pumping element includes a cylinder forming a compression chamber and having a discharge port. A piston having a pressure surface, a spill port, and a passageway connecting the pressure surface with the spill port is disposed in the cylinder for reciprocal movement between a first position and a second position. The pressure surface of the piston is adapted to increase the pressure of a fluid disposed in the compression chamber as the piston moves between the first position and the second position. The pressurized fluid flows through the discharge port of the cylinder. A metering sleeve is disposed around the piston and is configured to selectively cover the spill port as the piston reciprocates between the first and second positions. The metering sleeve has a groove that is adapted for fluid communication with the spill port as the piston reciprocates between the first and second positions.

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