To study the effectof the flexible wheel to the total outputstiffnessof the harmonic gear

a setof precision torsional stiffness test systemof flexible wheel is designed.To simulate the work station of the flexible wheel

it is buckled on a simulationwave producerwhich is fixed on the base plate and in the state ofworking deformation.The external tooth of flexible wheel is gripped by a special fixture and bi-directional gradual change force couple is applied to the output shaftof flexible wheel through a torque plate.A photoelectric autocollimator is used to measure the tiny rotation angle of the output shaft.Then precision torsional stiffness of the flexible wheel can be calculated out.Torsional stiffness tests of a certain type of precision flexible wheel are carried out.Test results showthat the torsional stiffness of the flexible wheel is up to 27 000 N°m/rad and itwill not lead to the insufficient stiffness of the harmonic gear.