John D Overbey

US Patent:

20080250922, Oct 16, 2008

Filed:

Jan 25, 2008

Appl. No.:

12/019817

Inventors:

James Russell Hayes - Campbell MO, US
Gary D. Dowdy - Dexter MO, US
Jeffery D. Wilkerson - Campbell MO, US
John David Overbey - Bloomfield MO, US

International Classification:

F01M 9/12
F02F 3/00

US Classification:

92158, 1231936, 92159

Abstract:

A piston has a piston body with a pair of pin bosses having pin bores aligned along a central axis. The pin bores have bearing surfaces, wherein at least one recess extends axially across at least one of the bearing surfaces. A groove extends partially about the bearing surface circumference and is arranged in fluid communication with the recess. The recess and groove provide a lubrication feature to the pin bore, while the bearing surface has an uninterrupted portion for enhanced load carrying capacity.