Fluid damping devices

Details Fluid damping devices Fluid damping devices

1994-08-05

1996-07-30

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Including movement limit stop or damping means

26714013, 267219, B64C 1104

Patent

active

055405495

ABSTRACT:
The invention relates to a fluid device for providing high load carrying capacity in an one direction and which provides a high level of damping along a substantially perpendicular direction. This is achieved by a device which includes an inner member and an outer member and a flexible section causing a connection therebetween, said flexible section exhibiting a substantially higher stiffness along one axis, a fluid cavity formed within said device, a piston attached to one of said inner member and said outer member, said piston being substantially surrounded by, and submersed in said fluid. In one embodiment, the piston includes a piston area A.sub.p which is substantially greater than 1/2 the fluid cavity area A.sub.c. Movement of the piston within the fluid cavity causes a damping force comprising a throttling component as well as a viscous shear component. Means are disclosed for substantially increasing the viscous shear component and throttling component including novel piston concepts. This invention has particular utility for use in hingeless rotor systems for helicopters.

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