Hydraulic valve lifter with continuous void

Details Hydraulic valve lifter with continuous void Hydraulic valve lifter with continuous void

1983-08-15

1985-06-25

Cline, William R.

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9055, 291567B, F01L 124

Patent

active

045247315

ABSTRACT:
A hydraulic valve lifter for use in high performance engines to reduce valve overlap at low operating speeds utilizes a restricted oil bleed passageway leading from the lifter pressure chamber to externally of the lifter to permit oil to bleed from the pressure chamber, preventing the lifter from pumping up to a fully solid condition at low operating speeds; the passageway, however, is sufficiently narrowed to pass an insignificant volume of oil therethrough at higher speeds. This passageway, previously defined as an external flat ground partway up the lifter plunger, is, according to the instant disclosure, ground fully up to the top of the plunger. This permits the plungers to be ground much more easily than before, inasmuch as they can be axially aligned on a magnetic chuck, or the equivalent, with the flat or groove which defines the bleed passageway cut in a single stroke, or several unhalting strokes, across an entire set of the lifter plungers.

REFERENCES:
patent: 3291107 (1966-12-01), Cornell
patent: 3304925 (1967-02-01), Rhoads
patent: 3670707 (1972-06-01), Guido
patent: 3921609 (1975-11-01), Rhoads

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