| 摘要 |
The operating mechanism comprises a camshaft (2) rotatable in synchronism with rotation of the IC engine and having an array of three cams (3,4,5); including a high speed cam (5) positioned at one end of the array. Three cam followers (8,7,9) are held in sliding contact with the cams, respectively. Selective interconnecting and disconnecting the followers allows them to operate the valves at different valve timinqs in different speed ranges of the IC engine. The speed ranges include a high speed range in which all of the valves are controlled by the high-speed cam.
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