Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1987-10-02
1989-01-10
Wolfe, Willis R.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9056, F01L 124
Patent
active
047965738
ABSTRACT:
Hydraulic engine valve lifter includes a pair of pistons defining a pressure chamber therebetween and a separate lash adjusting piston which defines a lash adjustment chamber with one of the pistons in the pair. One-way valve structures permit fluid to flow from the pressure chamber into the lash adjustment chamber thereby displacing the lash adjusting piston to, in turn, adjust valve lash. Motion damping functions during a downstroke of the lifter pistons are also provided by a valve damper chamber and fluid passageways between the pressure and damper chambers. Structure is provided which opens communication between the pressure and damper chambers during upstroke of the lifter pistons (thereby precluding motion damping) and then closes communication at a predetermined location during downstroke (thereby providing motion damping).
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Shea Stephen F.
Wakeman Russell J.
Allied-Signal Inc.
Wolfe Willis R.
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