To minimize weight while maintaining high durability.
A large end portion 11 has a body portion 11a integrally formed with a connecting portion 14, a halved cap portion 11b forming a piston pin hole 17 by being fixed to the body portion 11a by a bolt 15, and a pair of bolt boss portions 11c, 11d formed on the side portions of the body portion 11a and cap portion 11b. The connecting portion 14 is formed into an I-shaped cross-sectional shape having a pair of ribs 20 formed on both sides in the width direction of an end portion on the side of at least a large diameter portion, and also the end 20a of each rib 20 on the side of the large end portion is connected to the body portion 12a of an large end portion 12, along the tangent L1 of a crankpin hole 16 crossing the center line L in the longitudinal direction of the connecting portion 14, on an inner side in the width direction compared to the bolt boss portion 11c.
NISHI KUNIHIRO
| JPH10311326A | 1998-11-24 | |||
| JPH0968215A | 1997-03-11 | |||
| JP2005221071A | 2005-08-18 | |||
| JPS6319413A | 1988-01-27 |
Takao Ito
Jiro Higuchi