Patent ID: 9291120
Filing Date: 2016-03-22
CPC Classification: B23P,F02F,F05C,Y10T

Claim Text:
1. A piston for an internal combustion engine, comprising: a piston body made of steel; said piston body having a crown portion with an upper combustion surface, a pair of skirts depending from said crown portion and extending axially to lower skirt ends, a pair of pin bosses for receiving a wrist pin, and a plurality of pin boss bridges which extend from said pin bosses to said skirts; each of said pin boss bridges extending axially to a lower pin boss bridge end which presents a rib and wherein each rib has an increased wall thickness relative to a longitudinally adjacent portion of said pin boss bridge; and at least one of said pin boss bridges having a generally flat counter-bore surface which is spaced longitudinally above said lower skirt ends and lower pin boss ends for providing a reference location for machining of said piston body.