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US 4,381,902 AGranted
Helicopter tail rotor of the elastomerically-mounted composite flexbeam type
AssigneeHughes Helicopters, Inc.
InventorsRobert E. Head, Debashis Banerjee
Life of this patent
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AssigneeHughes Helicopters, Inc.
InventorsRobert E. Head, Debashis Banerjee
Estimating the term…
A fiberglass-epoxy flexbeam extends from tip to tip of each opposed blade pair, carrying the blade centrifugal forces so that none of the centrifugal loading is carried by the hub. The primary load-carrying connector between the flexbeam and the hub is a set of elastomeric pads. These provide a soft mount between the flexbeam and the hub to keep the primary bending moments within the flexbeams where the filaments are designed to accommodate them. The elastomeric pads are also effective in isolating the hub from chordwise loads which include the steady driving torque and the "C" mode and "S" modes of coriolis vibration. The elastomeric hub mount damps these vibrations and tunes their frequencies to values well separated from the rotor frequency.
In a helicopter rotor of the type in which a flexbeam interconnects blades on opposite sides of a hub and in which the flexbeam is attached to the hub, the improvement comprising:
In a helicopter rotor of the type in which a flexbeam interconnects blades on opposite side of a hub and in which the flexbeam is attached to the hub, the improvement comprising:
In a helicopter rotor of the type in which a flexbeam interconnects blades on opposite sides of a hub and in which the flexbeam is attached to the hub, the improvement comprising:
In a helicopter rotor of the type in which a flexbeam interconnects blades on opposite sides of a hub and in which the flexbeam is attached to the hub by clamping the flexbeam between a first hub plate and a second hub plate, the improvement comprising:
Dependencies are inferred from the claim text.