Pump piston having ring lubrication means

Details Pump piston having ring lubrication means Pump piston having ring lubrication means

1979-03-05

1982-09-21

Cohen, Irwin C.

Expansible chamber devices

With lubricating means

Piston has lubricant retaining or conducting means

92182, 277173, 417393, 417397, F01M 1102, F04B 1700, F16J 108

Patent

active

043500820

ABSTRACT:
A downhole oil well hydraulic pump has a reciprocating piston assembly with a piston ring mounted in a groove around the piston. This piston ring groove has a main portion which loosely mounts a piston ring and an auxiliary portion joining the main portion which accumulates well fluid to lubricate the piston ring during operation of the pump.

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patent: 4103594 (1978-08-01), Geffroy
patent: 4118154 (1978-10-01), Roeder
patent: 4174112 (1979-11-01), Carrens

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