Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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F01L
CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
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1/00
Valve-gear or valve arrangements, e.g. lift-valve gear
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F01L1/34
characterised by the provision of means for changing the timing of the valves without changing the duration of opening; and without affecting the magnitude of the valve lift
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F01L1/344
changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
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F01L1/348
by means acting on timing belts or chains
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