A damper ring is mounted in frictional engagement with a radially inwardly facing surface of a circumferential groove defined in a rotary part of a gas turbine engine. Energy dissipation is provided via sliding friction of the ring in the groove. Pressure relief dimples are provided around the outer diameter of the ring for locally reducing contact pressure at the outer diameter below a value at which the damper ring locks in the groove by friction forces when subject to centrifugal loads.

A damper ring is mounted in frictional engagement with a radially inwardly facing surface of a circumferential groove defined in a rotary part of a gas turbine engine. Energy dissipation is provided via sliding friction of the ring in the groove. Pressure relief dimples are provided around the outer diameter of the ring for locally reducing contact pressure at the outer diameter below a value at which the damper ring locks in the groove by friction forces when subject to centrifugal loads.

A device for damping the movement of a movably mounted component comprises a braking device which has a driven damper surface that cooperates with a secured damper surface to enclose a gap in which a viscous damping medium is present that causes a braking force of the braking device when the driven damper surface is rotated with respect to the secured damper surface, the braking force depending on the rotational speed of the driven damper surface. The device also has an additional braking device and a coupling. In the closed state of the coupling, at least one additional damper surface of the additional braking device driven by the movement of the component about an axis of the auxiliary braking device is rotated relative to at least one secured additional damper surface about the axis of the additional braking device, the additional braking device exerting an additional braking force. In the opened state of the coupling, the additional braking device is inactive. The coupling is activated by the braking force exerted by the braking device.

A device for damping the movement of a movably mounted component comprises a braking device which has a driven damper surface that cooperates with a secured damper surface to enclose a gap in which a viscous damping medium is present that causes a braking force of the braking device when the driven damper surface is rotated with respect to the secured damper surface, the braking force depending on the rotational speed of the driven damper surface. The device also has an additional braking device and a coupling. In the closed state of the coupling, at least one additional damper surface of the additional braking device driven by the movement of the component about an axis of the auxiliary braking device is rotated relative to at least one secured additional damper surface about the axis of the additional braking device, the additional braking device exerting an additional braking force. In the opened state of the coupling, the additional braking device is inactive. The coupling is activated by the braking force exerted by the braking device.

In an aspect, a tensioner for an endless drive member, comprising a shaft and base that are mountable to be stationary relative to an engine, a tensioner arm that is pivotable relative to the shaft about a tensioner arm axis, a pulley on the tensioner arm rotatable about a pulley axis that is offset from the tensioner arm axis, and that is engageable with an endless drive member, a bushing that is positioned radially between the pulley and the tensioner arm to support the pulley radially during relative rotation between the pulley and the tensioner arm, a tensioner spring that is positioned to urge the tensioner arm towards a free arm position, a damping element that engages the tensioner arm and that is engaged by a plurality of axially spaced segments of the tensioner spring.

In an aspect, a tensioner for an endless drive member, comprising a shaft and base that are mountable to be stationary relative to an engine, a tensioner arm that is pivotable relative to the shaft about a tensioner arm axis, a pulley on the tensioner arm rotatable about a pulley axis that is offset from the tensioner arm axis, and that is engageable with an endless drive member, a bushing that is positioned radially between the pulley and the tensioner arm to support the pulley radially during relative rotation between the pulley and the tensioner arm, a tensioner spring that is positioned to urge the tensioner arm towards a free arm position, a damping element that engages the tensioner arm and that is engaged by a plurality of axially spaced segments of the tensioner spring.

A vehicle interior component with an improved torque hinge is provided. The vehicle interior component may comprise a base and a cover configured to move relative to the base. The torque hinge may be coupled to the base and the cover and configured to hold the cover in any position relative to the base. The torque hinge may comprise a bushing, a brake, a clamp and a fastener configured to provide a clamping force between the clamp and brake. The bushing may be configured to move with the cover as the cover moves relative to the base to provide a frictional force against the brake. The clamp may be manufactured by an extrusion process. The clamp may comprise a curved portion and first and second extension portions extending from the curved portion. The first and second extension portions of the clamp may be substantially parallel.

A variable damping assembly includes a base, a supporting member, a damping member, and an elastic member. The supporting member is positioned on the base. The damping member is rotatably coupled to the supporting member and presses against the housing. The elastic member includes a first end and a second end opposite to the first end. The first end of the elastic member is coupled to the supporting member and the second end of the elastic member is coupled to the housing. The elastic member provides an elastic force and the damping member provides a damping force changed as the elastic force changes.

Devices, systems, and methods for damping vibration of a structural component or power-transmission shafts are disclosed. Damping devices, systems, and methods utilize a lightweight damping device, which is targeted at reducing the resonant amplitude of the first several beaming modes and/or torsional modes of bending a structural component comprising a hollow shaft or strut. The damping device includes a stiff concentric tube with damping elements disposed at each end. The device is inserted within the original structural component or shaft and attached thereto. When the primary shaft undergoes bending due to modal characteristics, the damping elements react to dissipate energy, which effectively reduces the resonant amplitude.

Devices, systems, and methods for damping vibration of a structural component or power-transmission shafts are disclosed. Damping devices, systems, and methods utilize a lightweight damping device, which is targeted at reducing the resonant amplitude of the first several beaming modes and/or torsional modes of bending a structural component comprising a hollow shaft or strut. The damping device includes a stiff concentric tube with damping elements disposed at each end. The device is inserted within the original structural component or shaft and attached thereto. When the primary shaft undergoes bending due to modal characteristics, the damping elements react to dissipate energy, which effectively reduces the resonant amplitude.