Importance

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Abstract

The present disclosure provide a driving device for a composite engine valve of a dedicated driving cam. The driving device includes a valve bridge, a dedicated driving cam, a driver, and a driving oil circuit. The driving oil circuit is configured to be intermittently in communication with a main piston hole and an auxiliary piston hole through a closure and disconnection of the driving oil circuit. The driver is fixedly mounted on a rocker arm shaft, which is simple in structure and low in cost. No motion friction between the driver and the rocker arm shaft, and the dedicated driving cam separating from the main piston when the driver is not in operation effectively reduce wear and noise between the dedicated driving cam and the main piston and improve engine power utilization. When the driver is in operation, the dedicated driving cam automatically adjusts a driving valve through a hydraulic gap, and a driving lift is not affected by an initial gap setting. The driving oil circuit is automatically drained once per revolution of a positive power cam, thus, a circulating flow of oil may not cause accumulation of impurities when the oil is too dirty, which improves working stability and reliability.

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First Claim