| 摘要 |
PURPOSE:To correct the compression ratio automatically in accordance to the temperature by moving a sub-piston inserted into a sub-cylinder conducting to the combustion chamber while providing a mechanism for displacing the sub- piston in accordance to the engine temperature on an internal-combustion engine having variable compression ratio. CONSTITUTION:A sub-piston 9 is inserted into a sub-cylinder 7 conducted to a combustion chamber 5 then the operating oil is fed through a check valve into a hydraulic chamber 12 on the rear face and flowed out through a spill port 16 of the stem 11a. An actuator 23 will slide a spill ring 17a on the stem 11a through a lever 27 in accordance to the load thus to stop the sub-piston at the position where the pressure oil flow through the spill port 16 will balance with the oil supply. The stem 11a is splitted into two and connected through a bimetal and constructed such that the entire length will be shortened as the engine temperature rise, then the compression ratio is corrected automatically to the lower level resulting in prevention of knocking under high temperature. |
