| 摘要 |
An internal combustion engine comprising at least one rotating, oscillating or reciprocating piston (20, 21) in a cylinder (11, 12), each piston (20, 21) defining with the cylinder (11, 12) a combustion chamber (35), each combusti on chamber (35) having at least one inlet valve (36) and one exhaust valve (37) , and means (40) to periodically open the inlet and exhaust valves, characterised in that the valves are closed by a gas spring (80, 82) having a closing force proportional to the speed of the engine.
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