Patent ID: 6971355
Filing Date: 2005-12-06
Classification: F01L

Abstract:
1. A variable lift and duration device of an internal combustion engine for opening and closing a valve, having a valve stem with a valve head mounted at one end, and a spring for biasing the valve head away from a valve seat in the engine, the device comprising: a first rocker arm having a first end, an upper surface, and a second end, the first end receiving a first roller and having an extended wall projecting from the upper surface, the second end riding a top of a camshaft lobe; a control linkage attached to the extended wall of the first rocker arm and a shaft fixedly attached to a block, the shaft receiving a second roller, which travels along the upper surface of the first rocker arm; a second rocker arm having a first end, a second end, an upper surface, and a lower surface, the lower surface receiving a first end of a lash adjuster and the valve stem of the poppet valve, the upper surface receiving the first roller received by the first end of the first rocker arm; wherein when the control linkage is in a first position, the first rocker arm and the first roller slides along the upper surface of the second rocker arm, towards the first end of the second rocker arm and the lash adjuster, such that the valve head has maximum duration and lift from the valve seat; and wherein when the control linkage is in a second position, the first rocker arm and the first roller slides along the upper surface of the second rocker arm, towards the second end of the rocker arm and away from the lash adjuster, such that the valve head has minimum duration and lift from the valve seat.