Engine piston having a recess defined in the lower surface of th

Details Engine piston having a recess defined in the lower surface of th Engine piston having a recess defined in the lower surface of th

1996-06-10

1998-02-03

Denion, Thomas E.

Expansible chamber devices

With lubricating means

Piston has lubricant retaining or conducting means

92237, 92238, 92157, F01B 3100

Patent

active

057132623

ABSTRACT:
A piston, which reciprocates in a cylinder bore of an engine, is supplied with lubricating oil. The piston includes pin bosses provided under a piston head, a symmetrical pair of skirts, and side walls connecting the pin bosses and the skirts. The side walls have openings, which communicate the outer side of the walls with the inner side of the walls under the middle section of the head. A recess is defined in the lower surface of the head to receive a spray of lubricating oil. The width of the recess is wider than the width of each skirt at its basal portion. This causes the oil supplied to the lower surface of the head during movement of the piston to be injected against the recess and thus be diffused. As a result, oil passes by the basal section of the skirts and permeates into the space defined by the cylinder bore and the skirts.

REFERENCES:
patent: 3319535 (1967-05-01), Holcombe
patent: 3403605 (1968-10-01), Schmidt
patent: 4161165 (1979-07-01), Belush
patent: 4715267 (1987-12-01), Richmond
patent: 4752995 (1988-06-01), Collyear
patent: 4817505 (1989-04-01), Rhodes
patent: 5076226 (1991-12-01), Watanabe et al.
patent: 5174249 (1992-12-01), Katou
Automobile Technical Information Publication No. 93626, published Dec. 6, 1993, p. 169.

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