| 摘要 |
A valve actuating device for an engine having first and second engine valves for each engine cylinder. The valve actuating device comprises first, second and third cams which have respectively first, second and third cam profiles which are different from each other. The first and second cam profiles are for a low engine speed range. The third cam profile is for a high engine speed range. First and second rocker arms are supported on a rocker shaft and swingable respectively in accordance with the first and second cam profiles and are adapted respectively to make valve movement actions of the first and second engine valves. A third rocker arm is supported on the rocker shaft and swingable in accordance with the third cam profile of the third cam. The third rocker arm is put into a first state to be simultaneously connected with the first and second rocker arms to serve as a single body, and a second state to be disconnected from the first and second rocker arms. Additionally, a connection mechanism is provided to put the third rocker arm into one of the first and second states, and includes a connection lever which is supported by the third rocker arm and swingable on a plane perpendicular to axis of the rocker shaft. A hydraulic pressure-operated driving device is provided to swingingly move the connection lever to engage with the engagement projections under hydraulic pressure. A lever restoring device is disposed in the third rocker arm to swingingly move the connection lever in a direction to put the third rocker arm into the second state.
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