| 摘要 |
A valve gear for charge cycle valves of internal combustion engines has a camshaft whose cam acts on a valve stem of a charge cycle valve via a bucket tappet which is guided in a cylinder head and on which an inner tappet is supported via a first pressure spring. A switchable coupling element can be used to couple the bucket tappet to the inner tappet. In the decoupled state, the charge cycle valve is not actuated if it is driven only via the bucket tappet. A clamping ring which has a conical surface with self-locking is provided as a switchable coupling element. The clamping device can be released with the aid of a slight oil pressure when the charge cycle valve is closed. Consequently, with the aid of simple means there is achieved, in a small overall space, a switch-off or changeover device for charge cycle valves which has only slight friction losses and can be effectively sealed because of the low oil pressures for actuation.
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