Rollerized timing lifter

Details Rollerized timing lifter Rollerized timing lifter

1986-08-04

1988-05-03

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9057, F01L 114

Patent

active

047412984

ABSTRACT:
A rollerized timing valve lifter for use in high performance engines. It has a press fit hydraulic mechanism utilizing an oil supply feed means from the roller body through and to the hydraulic mechanism. It has structure to maintain a self adjusting lifter to zero valve lash due to engine wear and heat expansion. It further includes a method of altering valve timing automatically through an oil restricted oil bleed passage way leading to the pressure chamber thereby allowing a leak down or delay of valve timing at low speeds. The passageway is narrow enough to become substantially inoperative at high engine speeds to thereby produce effective solid lifter action.

REFERENCES:
patent: 1682821 (1928-09-01), Woolson
patent: 1696866 (1928-12-01), Seaman
patent: 1874471 (1932-08-01), Du Bois
patent: 3299986 (1967-01-01), Briggs et al.
patent: 3303833 (1967-02-01), Melling
patent: 3664312 (1972-05-01), Miller
patent: 3967602 (1976-07-01), Brown
patent: 4173954 (1979-11-01), Speckhart
patent: 4231267 (1980-11-01), Van Slooten
patent: 4561393 (1985-12-01), Kopel

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