Shimmy damper for aircraft landing gear
A non-hydraulic shimmy damper that can be mounted to existing aircraft landing gear and does not substantially interfere with steering or require significant maintenance. When the shimmy damper requires maintenance it can be readily swapped out as a line-replaceable unit (LRU) thereby reducing aircraft downtime. The shimmy damper is mountable to an aircraft landing gear strut and includes a rotatable coupling member that engages a rotatable steering member of the landing gear strut. A damping assembly is coupled to the rotatable coupling member to provide a damping force. The damping assembly is adjustable so that a desired amount of damping force can be applied and/or maintained.
1. An aircraft shimmy damper mountable to an aircraft landing gear strut having a steerable member for steering a wheel carried by the landing gear, the damper comprising:
a rotatable coupling member; and
a damping assembly operatively coupled to the rotatable coupling member for resisting rotation of the rotatable coupling member, wherein the rotatable coupling member is configured to be rotatingly connected to the steerable member such that rotation of the rotatable coupling member rotates the steerable member, and wherein the damping assembly includes a rotation member and at least one friction member frictionally biased against the rotation member along a substantially flat engagement surface thereof to resist rotation of the rotation member.
2. A shimmy damper as set forth in claim 1 , further comprising a biasing mechanism for biasing the rotatable coupling member into engagement with the steering member of the landing gear strut unless any freeplay of the rotatable coupling member can be tolerated.
3. A shimmy damper as set forth in claim 1 wherein the friction member is at least one friction pad.
4. A shimmy damper as set forth in claim 1 , further comprising an adjustable biasing mechanism for controlling the bias applied to the rotation member.
5. A shimmy damper as set forth in claim 4 , wherein the adjustable biasing mechanism is a spring washer preloaded against the friction member.
6. A shimmy damper as set forth in claim 1 , wherein the rotatable coupling member is a base material that is one of surface hardened or hard coated, in order to resist wear or galling when in rotational contact with the damping assembly.
7. A shimmy damper as set forth in claim 1 , wherein the friction member is made of a material that resists wear and galling when in rotational contact with the rotatable coupling member.