Patent ID: 7225776

Claim:
A valvetrain comprising: a camshaft having low-lift and high-lift cams; a two-step rocker arm assembly having first and second movable arms engaged with said low-lift and high-lift cams, respectively, and a rocker arm spring biasing said first arm relative to said second arm, wherein said first arid second arms are lockable together for high-lift mode, and unlockable for lost-motion mode; arid a deactivating stationary lash adjuster engaged with said two-step rocker arm assembly and having a lost-motion spring, said deactivating stationary lash adjuster being unlockable to enable lost-motion movement against said lost-motion spring when unlocked; wherein said two-step rocker arm assembly and deactivating stationary lash adjuster are unlockable simultaneously for improved lost-motion control and to minimize required length of said deactivating stationary lash adjuster.