Adjustable valve system for an internal combustion engine

Details Adjustable valve system for an internal combustion engine Adjustable valve system for an internal combustion engine

1992-10-16

1993-05-18

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9039, F01L 134

Patent

active

052111431

ABSTRACT:
An adjustable valve system for an engine includes an axially shiftable camshaft with a plurality of cam lobes for actuating engine valves, with at least one of the lobes having a profile which varies as a function of the axial position of the lobe and camshaft. A valve lifter for use with a camshaft according to the invention includes a concave arcuate surface with a matching convex arcuate surface on a camshaft rubbing block pivotably mounted to the lifter. The lifter and rubbing block have a matching keyway and spline formed so that the rubbing block may accommodate changes in the cam position by pivoting about an imaginary axis which is perpendicular to the axis of the camshaft while being restrained by the spline and keyway from rotating about an axis parallel to the camshaft.

REFERENCES:
patent: 2980089 (1961-04-01), Sampietro
patent: 3945355 (1976-03-01), Calviac
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patent: 4352344 (1982-10-01), Aoyama et al.
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patent: 4693214 (1987-09-01), Titolo
patent: 4730588 (1988-03-01), Maeda
patent: 4850311 (1989-07-01), Sohn
patent: 5048474 (1991-09-01), Matayoshi et al.

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