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. 08, 2000
Filed:
Jun. 05, 1998
Sylvain Lamarre, Longuoull, CA;
Sylvain Brouillet, St. Basile-le-Grand, CA;
Pratt & Whitney Canada Corp., Longueuil, CA;
Abstract
A system for delivering a pressurized lubricant fluid from a stationary source to an interior of a drive shaft of a gas turbine engine which rotates at high speed and operates at high temperatures, includes a pair of axially spaced-apart seals that surround the shaft. The pressurized lubricant fluid is delivered to a radial passage defined between the seals. To ensure reliable operation under the high speed and high temperature conditions, the seals are constructed so that a film of the lubricant fluid is formed between the rotating shaft and the seals. The seals float on the film and wear is reduced. In order to minimize variations in the space between the seals and the shaft caused by changes in operating temperatures, each seal is surrounded by a control ring of material having a coefficient of expansion similar to the material of the shaft. The advantage is reliable delivery of lubricant to a shaft rotating at high speed in a high temperature environment.