| 摘要 |
PROBLEM TO BE SOLVED: To provide a hardly deformable piston structure. SOLUTION: A boss part of a pinhole for connecting a connection bar and a skirt part abutted on a cylinder liner are connected by a horizontal rib, and a thickness of the skirt part is gradually increased toward the horizontal rib. The skirt part is formed in such manner that the cross section of the skirt part within a range abutted on the cylinder liner in the reciprocating direction of the piston is uniform. The horizontal rib is directed perpendicularly to the axial direction of the pinhole.
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