Self adjusting valve catch with valve seating control

Details Self adjusting valve catch with valve seating control Self adjusting valve catch with valve seating control

2008-09-18

2011-12-20

Eshete, Zelalem (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090120, C123S090160

Reexamination Certificate

active

08079338

ABSTRACT:
A variable valve actuation system to actuate and control the seating velocity of an internal combustion engine valve is disclosed. The system comprises: a housing having a bore formed therein; an outer piston slidably disposed in the bore, said outer piston having an internal hydraulic passage, an internal chamber defined by an outer piston side wall, and an internal orifice connecting the internal hydraulic passage and the internal chamber; a catch piston slidably disposed in the outer piston; and a cone-shaped extension extending from the inner piston, wherein the cone-shaped extension is adapted to provide a variable flow area through the outer piston orifice to provide improved engine valve seating.

REFERENCES:
patent: 5381772 (1995-01-01), Melchior et al.
patent: 6192841 (2001-02-01), Vorih et al.
patent: 6510824 (2003-01-01), Vorih et al.
patent: 6637387 (2003-10-01), Gecim et al.
patent: 2005/0229888 (2005-10-01), Vanderpoel
patent: 2006/0273271 (2006-12-01), Yang et al.
Hope A. Bolton and Jay M. Larson, Valvetrain System Design and Materials, “A Chronology of Hydraulic Lash Compensation in the United States” by W.A. Dammers (Eaton Corporation, Marshall, Michigan), International Symposium on Valvetrain System Design and Materials, Apr. 14-15, 1997, pp. 27-41, ASM International, Materials Park, Ohio, United States of America.

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