The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 1993
Filed:
Dec. 16, 1992
James M Smietana, West Seneca, NY (US);
Moog Controls, Inc., East Aurora, NY (US);
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.