Intake or exhaust valve actuator

Details Intake or exhaust valve actuator Intake or exhaust valve actuator

1992-12-16

1993-08-03

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9015, 123 9024, 123 9051, F01L 902

Patent

active

052319598

ABSTRACT:
A hydraulic intake or exhaust valve actuator for an internal combustion engine has a generally cylindrical sleeve, a piston member formed with a head portion and a rod or shaft portion, and a rod bearing through which the rod portion slides axially. To accommodate wide temperature variations, the sleeve, piston member, and rod bearing, are all formed of the same material so as to have similar thermal expansion coefficients. Outer surfaces of the piston member head portion and rod portion are provided with a coating of titanium nitride, while corresponding inner surfaces of the sleeve and the rod bearing are provided with a hard coating of a different material, e.g. nickel boride. These coatings have different hardnesses, so that galling or adhesive contact is avoided.

REFERENCES:
patent: 3090367 (1963-05-01), Ayres
patent: 3291107 (1966-12-01), Cornell
patent: 3301240 (1967-01-01), Peresada
patent: 4200067 (1980-04-01), Trenne
patent: 4484545 (1984-11-01), Madsen
patent: 4643144 (1987-02-01), Fingerle et al.
patent: 4930464 (1990-06-01), Letsche

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