Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1989-10-19
1991-03-12
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
Tappet
123 9051, F01L 122
Patent
active
049985140
ABSTRACT:
In an overhead cam internal combustion engine, an adjustable thickness shim assembly is interposed between the end of a valve stem and the underside of a conventional inverted cup follower engaged by the cam shaft. A body component of the shim assembly forms a ramp for a tapered wedge component which is slidable along the ramp to adjust the effective thickness of the shim. The body component has an inclined threaded bore adjacent to the wedge component receiving a screw which when turned advances along the ramp to butt against the wedge component. The body component is formed of a material having a higher coefficient of thermal expansion than the screw such that when the engine is cold the screw is pinched in its bore and will not turn. When the engine is warmed to normal operating temperature, the body component expands to a greater degree than the screw and the screw is free to turn. The bore and screw are positioned such that inertial force exerted on the screw by movement with the valve stem tends to advance the screw toward the edge component so as to adjust the valve clearance automatically.
REFERENCES:
patent: 1733240 (1929-10-01), Saives
patent: 2003509 (1935-06-01), Jencick
patent: 2158730 (1939-05-01), Russell
patent: 2323965 (1943-07-01), Anglada
patent: 2747559 (1956-05-01), Campbell
patent: 3538895 (1970-11-01), Jensen
patent: 3752130 (1973-08-01), Scheibe
patent: 3818879 (1974-06-01), Line
patent: 3989016 (1976-11-01), Morgan
Beach Robert W.
Brown Ward
Lo Weilun
Myhre Charles J.
LandOfFree
Self-operating lash-adjusting tappet assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Self-operating lash-adjusting tappet assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-operating lash-adjusting tappet assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-442868