Patent ID: 11891924
Assignee: WEICHAI POWER CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A rocker arm mechanism for an engine, the rocker arm mechanism comprising:
a valve train including a valve bridge; and
a rocker arm pivotally disposed on a rocker arm shaft, the rocker arm including:
a plunger chamber;
a valve clearance adjuster including a hydraulic tappet slidably disposed in the plunger chamber;
an oil supply passage configured to supply oil to the plunger chamber; and
a hydraulically actuated control valve configured to alternately open and close the oil supply passage,

wherein the oil supplied to the plunger chamber extends the hydraulic tappet out of the rocker arm so as to abut against the valve bridge when the control valve opens the oil supply passage,
wherein a position of the hydraulic tappet relative to the rocker arm remains unchanged when oil from a pilot signal oil passage drives the control valve so as to close the oil supply passage, and
wherein the control valve closes the oil supply passage during an engine braking operation of the engine.