Contoured piston

Details Contoured piston Contoured piston

2005-08-30

2005-08-30

Lopez, F. Daniel (Department: 3745)

Expansible chamber devices

With lubricating means

Piston has lubricant retaining or conducting means

C092S160000

Reexamination Certificate

active

06935220

ABSTRACT:
A piston for use in internal combustion engines or reciprocating compressors such as those utilized in air-brake systems for heavy duty freight vehicles. The body of the piston of the present invention is contoured in manner to reduce the undesirable build-up of oil pressure that frequently occurs at the oil control ring or rings when the piston is in operation. The crown portion of the piston body includes a series of piston ring groove and piston ring lands, one of which is modified to include drainage notches. The skirt portion of the piston body includes a plurality of furrows near the face of the piston, a horizontal channel recessed into the surface of the piston skirt, and a horizontal groove formed in the outer skirt wall of the piston. These structures function individually and in combination to provide multiple means by which excess lubricating oil may be directed away from the oil control rings and back toward the crankcase or oil reservoir within the engine or compressor.

REFERENCES:
patent: 1465647 (1923-08-01), Ludlam
patent: 1473127 (1923-11-01), Short
patent: 4809591 (1989-03-01), Rhodes et al.
patent: 5035210 (1991-07-01), Arai et al.
patent: 5123386 (1992-06-01), Wakita et al.
patent: 5201805 (1993-04-01), Schubert
patent: 5331932 (1994-07-01), Watanabe et al.
patent: 5737999 (1998-04-01), Ariga
patent: 5839351 (1998-11-01), Nakada
patent: 6378482 (2002-04-01), Marcil
“A study of oil-film thickness for reducing oil comsuption in a reciprocating air-brake compressor” by Dunaevsky, et al,Lubrication and Sealing Oils, C591/013/2001 pp 423-437.

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