Patent ID: 7044095

Claim:
A roller tappet device suitable for warm start and adaptable for variation of pump plunger position in advance for cold start for use on single/multiple cylinder diesel engine with single plunger pump, the roller tappet device comprising: lubricating oil supply means ( 30 ) to supply oil at a desired pressure to the roller tappet ( 10 ), a movable piston ( 12 ) in the roller tappet ( 10 ) in position to engage and adjust the pump plunger ( 22 ) position in advance and thereby achieve desired crank angle, a plate valve ( 14 ) connected to the lubricating oil supply means such that the lubricating oil flowing through the plate valve ( 14 ) provides a force thrust on the piston ( 12 ), which lifts the piston ( 12 ) upward to thereby advance the pump plunger ( 22 ) position, a stopper means ( 18 ) provided for the piston ( 12 ) to limit the stroke of the piston ( 12 ), a cut off means ( 32 ) connected to lubricating supply means such that the lubricating oil supply is connected to or cut off from the roller tappet ( 10 ) depending upon temperature conditions, and a return means wherein throttle hole ( 15 ) is provided in said plate valve ( 14 ) such that throttle hole ( 15 ) facilitates the collapse of said pump plunger ( 22 ) position upon activation of oil supply cut off by the cut off means.