| 摘要 |
A mechanism to vary the lift of a valve of an internal combustion engine, the valve being operated by a cam lobe on a cam shaft. A lever is pivoted to a support rotatable about the cam shaft, the cam lobe acting on a shaped bearing area on the lever, the other side of the lever contacting the cam follower, so that by rotation of the support the timing of lift of the valve can be varied. Provision is also made for varying the degree of lift independently of the timing by means of a further lever pivoted to a sleeve rotatable about the cam shaft, the further lever contacting the first lever on one side and the cam follower on the other side. Rotation of the sleeve causes the effective lever arm of the first lever to be varied and thereby the degree of lift of the valve.
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