| 摘要 |
<p>A compression ratio-changing device for an internal combustion engine includes a rotary eccentric member (4) rotatably interposed between a piston and a connecting rod (3), a locking pin (9) for locking the rotary eccentric member to the connecting rod, and a device for driving the locking pin to selectively hold the rotary eccentric member to the connecting rod and release same therefrom. A sliding groove (7) formed in the connecting rod is disposed for parallel alignment with a guide groove (8) formed in the rotary eccentric member when the rotary eccentric member assumes a first angular position for decreasing the volume of a combustion chamber of the engine at a top dead center position of the piston to obtain a higher compression ratio, or a second angular position for increasing the volume of the combustion chamber at the top dead center position of the piston to obtain a lower compression ratio. The locking pin is disposed to be held between the guide groove and the sliding groove when the guide groove is in parallel alignment with the sliding groove, thereby locking the rotary eccentric member to the connecting rod.</p> |
