| 摘要 |
A compression ratio changing device in an internal combustion engine includes a piston inner element (5a), a piston outer element (5b) slidably fitted over an outer periphery of the piston inner element (5a) for sliding movement only in an axial direction and capable of being moved between a lower-compression ratio position (L) and a higher-compression ratio position (H), a bulking member (14) capable of being turned about axes of the piston inner and outer elements (5a5b) between a non-bulking position (A) and a bulking position (B), and an actuator (20) connected to the bulking member (14) for turning the bulking member (14) to the non-bulking position (A) and the bulking position (B). The bulking member (14) permits the movement of the piston outer element (5b) to the lower-compression ratio position (L) when it is in the non-bulking position (A), and retains the piston outer element (5b) in the higher-compression ratio position (H), when it has been turned to the bulking position (B). Thus, the piston outer element can be operated simply and precisely to the lower-compression ratio position and the higher-compression ratio position without being rotated.
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