Joints and connections – Articulated members – Plural distinct articulation axes
Patent
1977-06-02
1979-02-27
Shedd, Wayne L.
Joints and connections
Articulated members
Plural distinct articulation axes
403228, 416134A, F16D 300
Patent
active
041416643
ABSTRACT:
A rotary blade retention system comprises a rotor hub rotatable about a central axis and a retention assembly coupling at least one blade to the rotor hub. The blade extends generally radially from the hub and rotates with the hub about its central axis. The retention assembly includes a frictionless thrust bearing and an elastomeric thrust bearing connected together in series. The two bearings are mounted relative to the blade and the rotor hub such that when a centrifugal load is imposed on the blade, the bearings are loaded in compression and cooperate to restrain the blade against the centrifugal load. The frictionless bearing permits free pivotal movement of the blade about its longitudinal axis so as to effect variations in the pitch of the blade. The elastomeric thrust bearing includes at least one laminated bearing having a plurality of layers of rigid and elastomeric material which alternate lengthwise of the blade. The layers are also inclined relative to the longitudinal axis of the blade to define an effective elastic center for the bearing located along the blade radially outward of the two bearings relative to the rotor hub.
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patent: 2631680 (1953-03-01), LeCompte et al.
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patent: 3734546 (1973-05-01), Herbert et al.
patent: 3782854 (1974-01-01), Rybicki
patent: 3853337 (1974-12-01), Herbert et al.
patent: 3862812 (1975-01-01), Gorndt et al.
Bergman Lawrence A.
Moran Michael W.
Lord Corporation
Salada Maurice R.
Shedd Wayne L.
Wright James W.
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