Abstract
In a strain wave gearing (commonly known as a harmonic drive), the flexible spline (FS) is a thin-wall cylinder with external teeth, and the circular spline (CS) is a rigid ring with internal teeth. The load transmission between FS and CS is very complicated, because the large deformation of FS is caused by loads, and many teeth of FS and CS are engaged at the same time. However, it is very important, for analyzing the rotational transmission error, torsion rigidity and strength of the strain wave gearing, to study the load transmission. In this paper, the circumferential strains of external and internal surfaces of FS were measured by using strain gages. With the use of these strains, the tension and bending stresses were divided, and the relation between stresses and loads was obtained. Further, using the difference of the tension stresses caused by loads, tooth engagement zones of FS, which agreed well with the experiment results of tooth contact, and tooth load distribution were obtained.
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