Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1986-11-14
1988-01-26
Feinberg, Craig R.
Internal-combustion engines
Poppet valve operating mechanism
Tappet
123 9057, F01L 114
Patent
active
047210761
ABSTRACT:
A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an ice being located between a cam of a cam shaft and an end of a valve stem, the tappet comprising a cup shaped housing (1) closed at one end by an end member (3) against the outside of which the cam abuts and a cylindrical guide sleeve (6) concentric with a cylindrical wall (2) and arranged at its end away from member (3) in the center of an annular flange element (5) which at its outer circumference merges into the cylindrical wall (2) of the housing (1) and guide sleeve (6) is spaced at an opposite end from end member (3), a self-adjusting hydraulic play compensating element (10) being guided for longitudinal movement in the guide sleeve (6) comprising an inner piston (12) and an outer piston (11), the two pistons telescoping and defining oil pressure chamber (22) which communicates through a bore in the inner piston (12) closed by a check valve (21) with a central oil reservoir (13) disposed in inner piston (12), the outer piston (11) being mounted in the guide sleeve (6) and abutting at its closed end against the end of the valve stem, an annular oil reservoir (20) which is supplied with oil from the outside through a bore. A sleeve (17) beginning from end member (3) is sealed at its bottom end against oil reservoir (20) and slidingly engages the outer surface of guide sleeve (6) and extends close to flange element (5) having longitudinal channel (19) is formed between sleeve (17) and guide sleeve (6) to permit oil transfer.
REFERENCES:
patent: 4579094 (1986-04-01), Doppling et al.
patent: 4602409 (1986-07-01), Schaeffler
patent: 4648360 (1987-03-01), Schaeffler
Goppelt Dieter
Schmidt Dieter
Feinberg Craig R.
INA Walzlager Schaeffler KG
Macy M.
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