| 摘要 |
The operating mechanism comprises a camshaft (2) rotatable in synchronism with rotation of the IC engine and having at least one cam (4,5). A number of cam followers (7) are provided, one of which slidably engages the cam for selectively operating the valve according to a cam profile of the cam. Selective interconnecting and disconnecting of the cam followers allows them to operate the valve differently in different speed ranges of the IC engine. The camshaft has an annular raised portion (3), a low-speed cam (4), and a high-speed cam (5).
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