| 摘要 |
A control apparatus for deactivating one of an intake valve and an exhaust valve in an internal combustion engine has a stepped sleeve slidably receiving a valve stem in a smaller diameter portion and a rocker piston in a larger diameter portion. Hydraulic fluid is retained in the sleeve and a clamping block is positioned adjacent the exterior of the larger diameter portion. When the clamping block is activated to engage the sleeve, the sleeve remains stationary as reciprocating movement of the rocker piston causes the valve to open and close. When the clamping block is not activated, the sleeve is free to move with the piston leaving the engine valve closed.
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