Multiple-stage geared rotary actuator

专利名称：Multiple-stage geared rotary actuator发明人：Wesley A. Burandt申请号：US06/633871申请日：19840723公开号：US04721016A公开日：19880126

摘要：A multiple-stage geared rotary actuator having a plurality of balancedcompound differentials providing a multiple-stage output and for converting a high-speed, low-torque input to a low-speed, high-torque output for moving a member, suchas an aircraft flight control surface. The balanced compound planetary differentials eachhave a plurality of planet gear shafts with a center gear and outer gears at opposite sidesof the center gear and with the tubular planet gear shafts of the planetary differentialsbeing in axial alignment. The maximum deflection resulting from bending forces acting onthe tubular planet gear shafts is minimized by changing the boundary conditions at theends of the planet gear shafts. This change in the boundary conditions is achieved by theuse of structure positioned within the planetary gear shafts and extending through thelength of the rotary gear actuator and common to all of the axially aligned tubular gearshafts, with one embodiment of such support structure being a bolt which preloads theadjacent tubular planet gear shafts. The support of the tubular planet gear shaftsenables the design of a geared rotary actuator using longer planet gear shafts forincreased torque-transmitting capability while keeping planet gear shaft deflectionswithin acceptable limits for optimum gear mesh.

申请人：SUNDSTRAND CORPORATION

代理机构：Wood, Dalton, Phillips, Mason & Rowe

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