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:
Nov. 18, 2008
Filed:
Feb. 25, 2005
Mark D. Taylor, Derby, GB;
Neil W. Harvey, Derby, GB;
Mark D. Taylor, Derby, GB;
Neil W. Harvey, Derby, GB;
Rolls-Royce plc, London, GB;
Abstract
A turbine engine arrangement is provided in which contra rotating shaftsare respectively secured to a fan and a gearboxwhich is also coupled to the shaft. In such circumstances the relative rotational speed ratio between the shaftscan be determined with a first low pressure turbinesecured to the first shaftarranged to rotate at a lower speed but provide high work whilst a second low pressure turbinesecured to the second shaftrotates at a higher speed governed by the gearbox. By such an arrangement a smaller gearboxmay be used as less power is transferred through that gearboxthan with previous arrangements. By contra rotation of the turbinesa lower flow deflection guide vane assemblymay be used and a further stator/guide vane assembly is not required between the turbines