Patent ID: 8453559
Filing Date: 2013-06-04
Classification: F02F,F16J

Abstract:
1. A piston including a pair of mutually opposed longitudinal ribs individually formed with piston pin bosses for interconnecting mutually opposed piston skirt portions on a back side of a piston head, comprising: a pair of transverse ribs interconnect the mutually opposed longitudinal ribs; transverse-rib through holes being formed in the transverse ribs at places proximal to the back side of the piston head; and a skirt opening being formed by cutting away a part of the piston skirt portion that is opposed to the transverse rib that faces the transverse-rib through hole, wherein the pair of transverse ribs extend parallel to a center axis X-X of the piston pin bosses and project from a back side of the piston head.