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. 15, 1989
Filed:
Jul. 21, 1988
Stephen G Murray, Indianapolis, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A secondary oil system for a flight propulsion gas turbine engine having a vertical flight mode and a horizontal flight mode. The secondary oil system includes an annular secondary oil tank in a bearing sump of the engine adjacent a bearing to be lubricated, an oil inlet from the primary oil system of the engine into the secondary oil tank for filling the tank with a fraction of the oil flow in the primary oil system, a discharge orifice at the bottom of the secondary oil tank in each of the vertical and horizontal flight modes so that a gravity induced secondary oil flow constituting a small fraction of the oil flow in the primary system continuously issues from the secondary oil tank, a first partition in the secondary oil tank dividing the latter into a holding chamber which retains a volume of oil when the engine is shut down in the vertical flight mode after a normal landing and a descent reservoir open to the discharge orifice, and a second partition in the descent reservoir forming a standpipe over the discharge orifice in the horizontal flight mode so that the descent reservoir always contains a minimum volume of oil when the engine transitions from the horizontal to the vertical flight mode. If primary oil flow stops, the oil in the holding chamber sustains horizontal flight for an initial secondary duration and the oil in the descent reservoir sustains vertical flight for a final secondary duration for controlled descent.