Self-adjusting variable duration hydraulic lifter

Details Self-adjusting variable duration hydraulic lifter Self-adjusting variable duration hydraulic lifter

1990-04-02

1990-12-18

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9055, 123 9057, F01L 116, F01L 124

Patent

active

049778676

ABSTRACT:
A self-adjusting variable duration hydraulic lifter utilizes two plungers within the cylindrical lifter body which move together to shorten the overall top-to-bottom length of the internal plunger pair during the valve opening cycle of the engine at low RPM's to improve engine performance. A pre-established gap between the two plungers establishes the bleed down amount for the lifter at low RPM, and the gap is self-adjusting in that it will remain the same over the lifetime of the engine despite changes in the overall length of the valve train and heat compensation effected by the hydraulic mechanism effected by the lifter.

REFERENCES:
patent: 2908260 (1959-10-01), Bergmann
patent: 3921609 (1975-11-01), Rhoads
patent: 4524731 (1985-06-01), Rhoads
patent: 4601268 (1986-07-01), Rhoads
patent: 4671221 (1987-06-01), Geringer et al.
patent: 4765288 (1988-08-01), Linder et al.
patent: 4881499 (1989-11-01), Dietrich et al.
patent: 4913106 (1990-04-01), Rhoads

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