Internal combustion engine valve seating velocity control

Details Internal combustion engine valve seating velocity control Internal combustion engine valve seating velocity control

2007-06-12

2007-06-12

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090130, C251S012000

Reexamination Certificate

active

10926496

ABSTRACT:
The present disclosure provides an engine having a gas exchange valve and an actuator for the gas exchange valve, and also a method of reducing valve seating impact velocity. The actuator includes a body having a fluid inlet and a fluid outlet. A plunger is reciprocable in the body and has a travel distance between an advanced position and a retracted position, the plunger and body defining a chamber. A flow restriction orifice is disposed in at least one of the plunger and the body, and the chamber is in unrestricted fluid communication with the outlet over a first portion of the travel distance and in restricted fluid communication with the outlet by way of the orifice over at least a second portion of the travel distance.

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