Pistons with oil retaining depressions

Details Pistons with oil retaining depressions Pistons with oil retaining depressions

1988-03-18

1989-03-07

Garrett, Robert E.

Expansible chamber devices

With lubricating means

Piston has lubricant retaining or conducting means

92208, 123193P, F01B 3110

Patent

active

048095915

ABSTRACT:
A piston generates reduced noise in operation by the provision on its lateral bearing surfaces of two or more depressions in which oil is stored to provide a cushion against lateral movement of the piston at points of a reciprocation of the cycle where noise is generated. The depressions have a maximum depth of only 125 microns below the surrounding bearing surfaces formed on the piston. The depressions have circumferentially extending edges which are formed with steps connecting the depressions to the surrounding bearing surface.

REFERENCES:
patent: 1462501 (1923-07-01), Barwald
patent: 1760122 (1930-05-01), Drevitson
patent: 2407440 (1946-09-01), Osborne
patent: 4535682 (1985-08-01), Collyear et al.
patent: 4599935 (1986-07-01), Ellermann et al.

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