| 摘要 |
<p>A helicopter rotor blade supported by a flexbeam (2) to be rotatable about an axis of rotation, in which a pitching motion thereof is allowable, is provided with a device (6) for changing the pitch and damping the lead-lag motion thereof. The device (6) comprises a bushing (13) in a through hole (2a) formed at the inboard end of the flexbeam (2), an elastomeric pivot (7) loosely fitted in the bushing, elastomeric dampers (9) of cylindrical shape mounted on the upper and lower surfaces of the flexbeam (2) and coupled with the upper and lower ends of the elastomeric pivot (7) by means of nuts (8), and torque arms (12) extending through the bushing and the elastomeric dampers (a) and having the central portion thereof connected to central shafts (7a) of the elastomeric pivots (7). Each of the pitch sleeve (12) has both ends outwardly projecting beyond the elastomeric dampers (9) and secured to a epitch sleeve (3) which encloses the flexbeam (2). Therefore, the relative position between the pitch sleeve (3) and the elastomeric pivot (7) does not change even when lead-lag motion is imparted to the rotor blade.</p> |
