Propeller pitch change system
US7296969B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2005 |
| Grant date | Nov 20, 2007 |
| Priority date | — |
| Expiry date | Feb 3, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C11/38
- WIPO fieldTransport
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.