Internal-combustion engines – Poppet valve operating mechanism – Lubrication
Patent
1974-03-11
1978-04-11
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
Lubrication
123 9055, 123 9058, F01L 114, F01L 122, F01L 124
Patent
active
040833348
ABSTRACT:
A hydraulic valve lifter is provided with a socket or seat for a hollow pushrod, the socket being constructed with three diameters, of which the uppermost is of largest size and is concentric with the outside surface of the plunger, the lowest socket section being of smallest diameter and being force-fitted into the plunger, while the intermediate socket section forms with the unbroken inner surface of the body, an annular passageway for oil constituted of a clearance of constant radial width to a transverse bore in the socket. The socket and plunger are ground together to obtain complete concentricity, and the clearances about the top section of the socket and about the plunger are of the same order, so that concentricity between the combined socket and plunger on the one hand, and the inner surface of the body of the lifter on the other, is maintained, the low clearance about the top section of the socket providing a stopper effect in contrast to the much wider clearance afforded by the intermediate section of the socket. Because of the concentricity, a constant average leakdown time is assured in any condition of the parts, while at the same time the lifter meters the oil to the valve train, so as to provide always substantially the same flow of oil in any condition of the lifter, and the lifter operates to self-clean the system if a particle of foreign material is entrained in the oil, relative movement between plunger and body being always maintained.
REFERENCES:
patent: 2818050 (1957-12-01), Papenguth
patent: 2874685 (1959-02-01), Line
patent: 2908260 (1959-10-01), Bergmann
patent: 3014472 (1961-12-01), Wisman
patent: 3053239 (1962-09-01), Pechenik
patent: 3448730 (1969-06-01), Abell
patent: 3476093 (1969-11-01), Line
patent: 3598095 (1971-08-01), Ayres
patent: 3614942 (1971-10-01), Erickson
patent: 3875911 (1975-04-01), Joseph
patent: 3967602 (1976-07-01), Brown
Myhre Charles J.
Nelli R. A.
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