Internal-combustion engines – Poppet valve operating mechanism – Tappet
Patent
1987-08-31
1988-07-12
Wolfe, Willis R.
Internal-combustion engines
Poppet valve operating mechanism
Tappet
F01L 124
Patent
active
047562820
ABSTRACT:
A direct acting hydraulic valve lifter of the type that is reciprocably journaled as in the cylinder head of an internal combustion engine so as to be engaged by a cam on an engine driven camshaft to control opening and closing movement of an associate valve. The lifter includes a follower body having a circular outer tubular wall with an inner integral web closely adjacent to one end thereof that terminates at a stepped bored integral depending piston, the one end thereof being closed by a disk cam engaging foot which forms with the piston and a surface of the web a fluid reservoir. A baffle, fixed to the plunger and to inner surface of the tubular wall, defines an oil supply passage which is adapted to receive fluid via a side port in the tubular wall and to be in flow communication with the fluid reservoir via an aperture in the web. A cup-shaped, closed end cylinder member slidably encircles the plunger to form therewith a hydraulic lash adjuster having a pressure chamber therein. In one enbodiment, a mechanical retainer is operatively secured to the tubular wall whereby to retain the cylinder member in unit assembly on the plunger. In a preferred embodiment, lubricating oil in the pressure chamber and in a leak-down flow path between the cylinder member and plunger and a one-way ball valve controlling flow into the pressure chamber are operative to hold the cylinder member in unit assembly on the plunger.
REFERENCES:
patent: 2880710 (1959-04-01), O'Neill
patent: 3509858 (1970-05-01), Scheibe et al.
patent: 4465038 (1984-08-01), Speil
patent: 4470381 (1984-09-01), Buente et al.
patent: 4567862 (1986-02-01), Kodama
patent: 4578094 (1986-04-01), Doppling et al.
patent: 4590898 (1986-05-01), Buente et al.
patent: 4610225 (1986-09-01), Camosso et al.
Cole Donald G.
Knape Richard S.
Krein Arthur N.
Kunz Timothy W.
General Motors Corporation
Krein Arthur N.
Macy M.
Wolfe Willis R.
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