Internal combustion engine having valves with variable...

Details Internal combustion engine having valves with variable... Internal combustion engine having valves with variable...

2007-05-01

2007-05-01

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090120, C123S090130, C123S090480

Reexamination Certificate

active

11154568

ABSTRACT:
In an internal combustion engine with variable actuation valves, each variable actuation valve is actuated by an actuator assembly including an actuating piston slidably mounted in a guide bushing. Between the actuating piston and the stem of the respective valve is interposed an auxiliary hydraulic tappet comprising a first bushing and a second bushing positioned inside the first bushing in such a way as to define a first chamber between the second bushing and the actuating piston, and a second chamber between the two bushings of the hydraulic tappet. The first chamber is fed a pressurized chamber of the engine lubrication loop. A check valve controls a communication between the two chambers of the tappet, to allow the passage of fluid in the direction of the second chamber. The first bushing of the auxiliary hydraulic tappet is positioned outside the guide bushing of the actuating piston, so that said bushing can be dimensioned with a relatively small diameter, regardless of the outer diameter of the auxiliary hydraulic tappet.

REFERENCES:
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