| 摘要 |
PROBLEM TO BE SOLVED: To simplify the structure of a hydraulic fluid control system by simultaneously controlling an intake valve timing variable actuator and an exhaust valve timing variable actuator by use of one oil control valve. SOLUTION: An intake valve timing variable actuator 20 is mounted on the end part of an intake-side camshaft 19 to advance or delay the intake-side camshaft 17, whereby the opening and closing timing of an intake valve 17 is continuously changed. An exhaust valve timing variable actuator 22 is mounted on the end part of an exhaust-side camshaft 21 to advance or delay the exhaust-side camshaft 21, whereby the opening and closing timing of an exhaust valve 18 is continuously changed. One oil control valve 40 supplies a hydraulic fluid to each of the intake-side actuator 20 and the exhaust-side actuator 22 and properly controls the oil feed quantity at the same time. According to this, the oil passage structure of a hydraulic fluid control system can be simplified to moderate the limitation of the mounting space, and the system cost can be reduced.
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