The invention relates to a split
rocker arm and valve bridge combined type
engine valve double-
piston hydraulic driving device. A main driving
piston and an auxiliary driving
piston are arranged on asplit
rocker arm and a valve bridge body correspondingly, the auxiliary driving piston is connected with an
exhaust valve, and a driving oil channel is communicated with the main driving piston, the auxiliary driving piston and a driving control valve. When the driving control valve opens a driving oil channel, the main driving piston and the auxiliary driving piston achieve hydraulic linkage, during lift driving, a second
rocker arm body and the valve bridge do not move, and the auxiliary driving piston opens the
exhaust valve; and when main lift starts, a main piston body oil channel and anauxiliary piston oil channel are
cut off, and the auxiliary driving piston automatically resets. When the driving oil channel is
cut off, in the driving lift process by an integrated
cam, the drivingmain piston absorbs the driving lift from the integrated
cam assembly to the split rocker arm, the split rocker arm is fixed, and the driving lift of the integrated
cam is not transmitted to the sideof the
exhaust valve. The split rocker arm and valve bridge combined type
engine valve double-piston hydraulic driving device is simple in principle and compact in structure, and improves the reliability and durability of engine driving operation.