초록 ▼

The present invention relates to a vibration damper, in particular for a helicopter rotor, the damper comprising a driving element having a "main" axis and a rigid element, and including a damping assembly functionally interconnecting the driving element and the rigid element to damp vibrations in a

The present invention relates to a vibration damper, in particular for a helicopter rotor, the damper comprising a driving element having a "main" axis and a rigid element, and including a damping assembly functionally interconnecting the driving element and the rigid element to damp vibrations in at least one direction perpendicular to said main axis. The damper includes a hydraulic damper device having first and second sets of plane laminations each having its plane perpendicular to the main axis, the laminations of the first and second sets being interleaved and narrowly spaced apart so as to present viscous damping zones each situated between one of the laminations of the first set and one of the laminations of the second set. The damper includes an elastic element having low stiffness parallel to the main axis so as to decouple compression excitation between the driving element and the rigid element.

대표청구항 ▼

[ We claim:] [1.] A vibration damper comprising:a driving element having a main axis and intended to be driven by a drive element;a rigid element intended to be mounted on a structure; anda damping assembly functionally connecting the driving element and the rigid element to damp vibration in at lea

[ We claim:] [1.] A vibration damper comprising:a driving element having a main axis and intended to be driven by a drive element;a rigid element intended to be mounted on a structure; anda damping assembly functionally connecting the driving element and the rigid element to damp vibration in at least one cross-wise direction perpendicular to said main axis, the damping assembly comprising:a flexible device connected with the rigid element and defining a cavity which at least partially surrounds the driving element and is filled with viscous fluid, the flexible device having low stiffness in said cross-wise direction so as to permit relative movement between the driving element and the rigid element in said cross-wise direction; anda hydraulic damper device disposed in the cavity of viscous fluid and including first and second sets of plane laminations each having its plane perpendicular to the main axis, the first set of laminations being mounted on the driving element via a first mechanical link and the second set of laminations being mounted on the rigid element via a second mechanical link, the laminations of the first and second sets of laminations being disposed in interleaved manner and being closely spaced apart so as to present viscous damping zones each situated between one lamination of the first set and one lamination of the second set, and wherein at least one of the first and second mechanical links includes at least one elastic element presenting low stiffness parallel to the main axis, the elastic element providing a direct non-rigid elastic connection for compressive excitations between the respective one of the driving and rigid elements and the corresponding set of laminations so as to provide decoupling of compression excitation between the respective one of the driving and rigid elements and the corresponding set of laminations and thereby decouple compressive excitations between the driving element and the rigid element.