Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1995-10-30
1997-03-04
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Tappet
74569, F01L 114
Patent
active
056069391
ABSTRACT:
A valve actuation assembly is disclosed for use on an internal combustion engine. Retention of the roller shafts within the lifter body is through a wire c-ring which engages circumjacent internal and external ring grooves located in the shaft opening in the lifter body and on the outer circumference of the roller shaft. The c-shaped wire ring is formed so that, in its free state, it has an outside diameter larger than the groove in the shaft opening but, in an elastically collapsed state, its outside diameter is no larger than the shaft diameter. When the roller-shaft assembly is installed in the shaft opening of the lifter body, the c-shaped wire ring is elastically collapsed into the shaft groove. As such, the shaft and wire ring may be inserted into the shaft openings in the lifter body with little effort until the shaft reaches a position at which the shaft and opening grooves come into registry, allowing the wire ring to expand outwardly into the shaft opening groove in an attempt to reach its free-state shape. Ring expansion is limited by the total depth of the shaft opening groove being less than the diameter of the wire resulting in an interference between the seated wire and the shaft groove which locates and retains the shaft in the shaft opening of the lifter body.
REFERENCES:
patent: 5261361 (1993-11-01), Speil
patent: 5361733 (1994-11-01), Spath et al.
patent: 5385124 (1995-01-01), Hillebrand et al.
Barr Jr. Karl F.
General Motors Corporation
Lo Weilun
LandOfFree
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