| 摘要 |
PURPOSE:To smoothly turn an eccentric bearing and improve its reliability and durability, by providing a different lubricating oil passage communicated to an oil passage for a slidable lock pin provided between a connecting rod and the eccentric bearing. CONSTITUTION:Under a condition in which an eccentric bearing 5 and connecting rod 4 are not fixed by a lock pin 7, a piston 1 is in a low compression state, reversely under a condition fixed with the both 5, 4 by the pin 7, the piston becomes a high compression state. In such a variable compression mechanism, lubricating oil passages 10, 11 are connected in the rod 4 in addition to a normally provided lock pin driving oil passage 8. That is, the passage 10 is communicated to a peripheral sliding part 12 of the bearing 5 from a throttle part 9 and the passage 11 is communicated to an internal peripheral sliding part 13 from the part 12. While a groove 14 is formed circumferentially along the periphery of the bearing 5 in a small-end of the rod 4, and this groove 14 is connected to an oil filler port 15. |
