Multi-link type piston of an internal combustion engine - crank mechanism , multi-link type piston - control axis of the crank mechanism or multi-link type piston , - manufacturing method of the control shaft of the crank mechanism

摘要

PROBLEM TO BE SOLVED: To provide a double-link type piston crank mechanism of an internal combustion engine, which can fine-tune a compression ratio between cylinders without worsening lubricating performance of a sliding part between an eccentric sleeve and a control link.;SOLUTION: A double-link type piston crank mechanism of an internal combustion engine has a cylindrical eccentric sleeve 20 press-fitted in an eccentric shaft section 7. A top dead center position of a piston is adjustable for each cylinder by rotating the eccentric sleeve 20 with respect to the eccentric shaft section 7. Accordingly, a compression ratio between cylinders can be finely tuned without worsening lubricating performance of a sliding part between the eccentric sleeve 20 and a control link 5.;COPYRIGHT: (C)2012,JPO&INPIT