Piston mechanism of fluid displacement apparatus

Details Piston mechanism of fluid displacement apparatus Piston mechanism of fluid displacement apparatus

1997-11-25

1999-08-10

Nguyen, Hoang

Expansible chamber devices

Displacement control of plural cylinders arranged in...

Parallel cylinders

92155, 92 57, 417269, F04B 112, F01B 300

Patent

active

059341700

ABSTRACT:
A piston-type fluid displacement apparatus includes several pistons, each of which is slidably disposed within one of several cylinder bores. A plating layer, which includes a self-lubricating material, is coated on a peripheral surface of each piston. At least one annular groove is formed on a periphery surface of each piston, and, at least one piston ring is disposed within the annular groove of each piston for sealing a gap between the piston and the cylinder bore. Thereby, the piston-type fluid displacement apparatus may be simply manufactured at a reduced assembly cost while simultaneously prolonging the life of the piston rings and while reducing or eliminating a decrease in compression efficiency during the operating life of the piston-type fluid displacement apparatus.

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