Patent ID: 8065985
Filing Date: 2011-11-29
Classification: F02B,F02F,Y02T

Abstract:
1. A piston, comprising: a piston body extending along a central axis along which the piston reciprocates and having an upper crown portion with an upper combustion wall against which combustion forces act and a lower crown portion with a pair of pin bosses spaced for receipt of a small end of a connecting rod there between, said pin bosses having pin bores aligned with one another along a pin bore axis, said upper crown portion and said lower crown portion forming an outer oil gallery and a central oil gallery in fluid communication with one another, said outer and inner galleries separated by an annular wall; and said central oil gallery being formed in part by a flange extending radially inwardly from said annular wall and upwardly toward said upper combustion wall to a free edge spaced from said upper combustion wall, said free edge forming an opening about said central axis and having a non-planar uppermost surface including depressions aligned opposite one another across said opening.