Desmodromic valve
Reciprocating engine valve actuation mechanism
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 poppet valve that is positively closed by a cam and leverage system, rather than by a more conventional spring.
Nº Q1200804 ★★★
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Desmodromic valve
Reciprocating engine valve actuation mechanism
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 poppet valve that is positively closed by a cam and leverage system, rather than by a more conventional spring.
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From Wikipedia
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 poppet 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 spent gases at the end of the cycle. In a conventional four-stroke engine, valves are opened by a cam and closed by return spring. A desmodromic valve has two cams and two actuators, for positive opening and closing without a return spring.
Text: Wikipédia, CC BY-SA 4.0. · Image: Wikimedia Commons (CC BY-SA 3.0) ·
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