DUAL LIFT ROCKER ARM LATCH MECHANISM AND ACTUATION ARRANGEMENT THEREFOR

摘要

A valve control system including a camshaft having first and second cam profiles, the valve control system comprising a rocker arm assembly (11 ) including a first rocker arm (13) having a first cam follower (15) in engagement with the first cam profile, and a second rocker arm (17) having a second cam follower (23,25) in engagement with the second cam profile. The engine includes a fulcrum location (P) operable to provide a source of pressurized fluid, and the first rocker arm includes a latch member (47) moveable between latched (FIG. 6) and unlatched conditions. The latch member is biased toward the latched condition by a fluid pressure in a chamber (51 ), and the first rocker arm defines a fluid passage (55) having a first end (57) in open fluid communication with the pressure source, and a second end (59) in open fluid communication with the pressure chamber (51) .