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. 20, 2007
Filed:
Oct. 12, 2005
Mark R. Raes, Andover, CT (US);
Paul A. Carvalho, Westfield, MA (US);
Mark R. Raes, Andover, CT (US);
Paul A. Carvalho, Westfield, MA (US);
Hamilton Sundstrand Corporation, Windsor Locks, CT (US);
Abstract
A pitch change system includes a yoke assembly which receives a pitch trunnion that extends from each propeller blade assembly. Each pitch trunnion is received within a respective bearing assembly mounted in the yoke assembly. The bearing assemblies are mounted between a forward yoke plate and an aft yoke plate. A spacer is mounted between each adjacent bearing assembly to position and restrain each bearing assembly. Each spacer includes an extension which retains the adjacent bearing assembly on a pitch trunnion pin in a direction generally parallel to axis. Each of the bearing assemblies includes a generally rectilinear outer race and a spherical inner race inside diameter to receive the pitch trunnion pin. The rectilinear outer race reduces contact stresses to acceptable levels for high load applications yet permits blade installation without actuator disassembly.