| 摘要 |
An eccentric sleeve (5) is provided rotatably in a big end of a connecting rod (6), so that a bearing hole and a crankpin (2) become eccentric relative to each other. The sleeve has flanges at its opposite ends, and defines two engagement portions (5a,5b) angularly shifted over 180 DEG , one in one of the flanges and the other in the other flange. A stopper pin (12) is fitted in a through-hole formed in the big end, thereby dividing it into fluid pressure chambers (13,14). Fluid pressures are applied to the chambers, respectively such that a pressure difference is produced between the chambers while a prescribed fluid pressure exists even on the low pressure side. The fluid pressure of either one of the chambers can be made higher than that of the other chamber, whereby the stopper pin is actuated to engage either one of the engagement portions. The sleeve can therefore be fixed at an either minimum or maximum eccentric position on the big end, whereby the connecting rod takes a state apparently most contracted or extended and an either low or high compression ratio is realized accordingly. <IMAGE> |
