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desmodromic valve
:''In general mechanical terms, the word ''desmodromic'' is used to refer to mechanisms that have different controls for their actuation in different directions.''
A desmodromic valve is a reciprocating engine valve that is positively closed by a cam and leverage system, rather than by a more conventional spring.
The valves in a typical four-stroke engine allow the air/fuel mixture into the cylinder at the beginning of the cycle and exhaust gases to be expelled at the end of the cycle. In a conventional four-stroke engine valves are opened by a cam and closed by return spring. An engine using desmodromic valves has two cams and two actuators, each for positive opening and closing without a return spring.
==Etymology==
The word comes from the Greek words ''desmos'' (δεσμός, translated as "bond" or "knot") and ''dromos'' (δρόμος, "track" or "way"). This denotes the major characteristic of the valves being continuously "bound" to the camshaft.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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