Patent ID: 8356977
Filing Date: 2013-01-22
Classification: B64C,F16F

Abstract:
1. A rotary wing aircraft rotary lead lag damper, said rotary wing aircraft rotary lead lag damper comprised of: a nonelastomeric outer canister, said nonelastomeric outer canister having an outer canister housing and an inner paddle wheel member receiving cavity for receiving an inner paddle wheel member, said inner paddle wheel member receiving cavity centered about a longitudinally extending center bore axis, said inner paddle wheel member receiving cavity including N radially extending dividers including at least a first radially extending divider and at least a second radially extending divider, said N radially extending dividers extending in a direction from said outer canister housing inward towards said center bore axis, said outer canister housing including at least N longitudinally extending liquid conduits including at least a first longitudinally extending liquid conduit, a nonelastomeric inner paddle wheel member, said nonelastomeric inner paddle wheel member having a center of rotation axis for alignment with said center bore axis, said nonelastomeric inner paddle wheel member including N radially extending paddles including at least a first radially extending paddle and at least a second radially extending paddle, a damper liquid, an upper elastomeric tubular intermediate member, and a lower elastomeric tubular intermediate member, said nonelastomeric inner paddle wheel member received in said nonelastomeric outer canister inner paddle wheel member receiving cavity with said upper elastomeric tubular intermediate member and said lower elastomeric tubular intermediate member between said nonelastomeric inner paddle wheel member and said nonelastomeric outer canister, with said first radially extending divider received between said first radially extending paddle and said second radially extending paddle, said first radially extending divider and said first radially extending paddle forming a first radially extending divider first variable volume chamber, said first radially extending divider and said second radially extending paddle forming a first radially extending divider second variable volume chamber, said first radially extending divider first variable volume chamber and said first radially extending divider second variable volume chamber in liquid communication through said first longitudinally extending liquid conduit wherein a clockwise rotation of the inner paddle wheel member about said center of rotation axis relative to said nonelastomeric outer canister pumps said damper liquid from said first radially extending divider second variable volume chamber through said first longitudinally extending liquid conduit towards said first radially extending divider first variable volume chamber, and a counterclockwise rotation of the inner paddle wheel member about said center of rotation axis relative to said nonelastomeric outer canister pumps said damper liquid from said first radially extending divider first variable volume chamber through said first longitudinally extending liquid conduit towards said second radially extending divider second variable volume chamber.