| 摘要 |
An engine valve operating control mechanism for an internal combustion engine having a transmission output driven gear pump and governor controlling the output of the oil pressure from the pump in direct proportion to the engine load whereby a hydraulic cylinder and piston unit operated by the pump pivots a cam-shifting lever which shifts the camshaft to move one of three different contoured cam lobe means in contact with the engine valves for opening and closing the intake and exhaust valves at one of three operating conditions for low, medium or high engine speed operation under load conditions.
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