characterised by the provision of means for changing the timing of the valves without changing the duration of opening

Full Title

Valve-gear or valve arrangements, e.g. lift-valve gear (lift-valve and valve-seat assemblies per se F01L3/00; slide-valve gear F01L5/00; actuated non-mechanically F01L9/00; valve arrangements in working piston or piston rod F01L11/00; modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations F01L13/00) > characterised by the provision of means for changing the timing of the valves without changing the duration of opening

Child Classifications

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• F01L 1/344 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear