Soft inplane helicopter rotor
US4257739A · kind A · utility
55Cited by
11References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1978 |
| Grant date | Mar 24, 1981 |
| Priority date | — |
| Expiry date | Sep 11, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/35
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A helicopter rotor hub assembly (10) in which a blade grip (30) extends inboard of a yoke (14) and transfers centrifugal forces to the yoke (14) through a spherical elastomeric bearing (38). Pitch change of the grip (30) and blade (32) is accommodated by the spherical elastomeric bearing (38) which also acts as the pivot point for lead-lag motion of the blade (32) and grip (30). A lead-lag damper (22) is located inboard of the elastomeric bearing (38) and is connected between one end of the grip (30) spaced away from the lead-lag pivot and the yoke (14) for damping the lead-lag motion between the grip (30) and yoke (14).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.