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)

Child Classifications

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• F01L 1/02 Valve drive (transmitting-gear between valve drive and valve F01L1/12)
• F01L 1/12 Transmitting gear between valve drive and valve (simultaneously operating two or more valves F01L1/26)
• F01L 1/20 Adjusting or compensating clearance
• F01L 1/26 characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder (with coaxial valves F01L1/28)
• F01L 1/28 characterised by the provision of coaxial valves; characterised by the provision of valves co-operating with both intake and exhaust ports
• F01L 1/30 characterised by the provision of positively opened and closed valves, i.e. desmodromic valves
• F01L 1/32 characterised by the provision of means for rotating lift valves, e.g. to diminish wear
• F01L 1/34 characterised by the provision of means for changing the timing of the valves without changing the duration of opening
• F01L 1/36 peculiar to machines or engines of specific type other than four-stroke cycle
• F01L 1/44 Multiple-valve gear or arrangements, not provided for in preceding subgroups, e.g. with lift and different valves
• F01L 1/46 Component parts, details, or accessories, not provided for in preceding subgroups