Dual bucket hydraulic actuator

Details Dual bucket hydraulic actuator Dual bucket hydraulic actuator

1992-10-15

1993-06-08

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9049, 74569, F01L 902

Patent

active

052169880

ABSTRACT:
A direct acting hydraulic valve lifter, DAHVL, having dual bucket tappets is provided with means for damping the inner bucket tappet which is coupled to the engine valve. In doing so, the engine valve is damped on its closure reducing noise and wear of the engine valve. Damping is accomplished by means of side wall communication port for connecting the inner chambers of each bucket tappet which is closed by the reciprocal motion of the inner tappet as the cam closes the engine valve and a thin orifice disk controlling the flow of the fluid from the second or inner bucket to the first bucket tappet. Hydraulic pressure is multiplied by the respective areas of the tappet pistons so that the overall height of the DAHVL in a direct acting cam-valve system in reduced.

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