| 摘要 |
<p>A valve mechanism in an internal combustion engine, wherein a driving rocker arm interlockingly connected to an air intake valve and a free rocker arm capable of becoming independent of the air intake valve are interposed between a cam shaft and at least the air intake valve out of the air intake valve and an exhaust valve which are biased by springs in the valve-closing direction, each of the rocker arms is provided with a connection switching mechanism for switching between connection and release, and a lost motion mechanism for resiliently biasing the free rocker arm toward the cam shaft is provided on a main body of the engine, said lost motion mechanism (38) being provided on the main body of the engine (E) upwardly of the driving rocker arm (26), so that a sufficient space can be secured under the respective rocker arms (24-26).</p> |
