Tooth profile modification and meshing characteristics for a novel precision movable tooth drive based on logarithmic spiral

The logarithmic spiral movable tooth driver (LSMTD) is a new type of precision heavy-duty transmission, which is expected to solve the coexistence of high precision, strong overload and high-power density in traditional gear transmission. However, due to the special transmission principle, the tooth profile modification method of LSMTD and the influence of design parameters on meshing characteristics are still unclear, which seriously restricts its development. To solve this problem, this study proposes a systematic LSMTD tooth profile modification method and establishes the corresponding key meshing characteristic calculation model. First, according to the transmission defects of the basic tooth profile of LSMTD, a modification method and corresponding tooth profile equation are established; on this basis, the calculation model of key meshing characteristics such as entrainment speed, induced normal curvature, pressure angle of LSMTD is constructed, and the influence of design parameters on the meshing characteristics of LSMTD is analyzed; finally, the correctness of the LSMTD tooth profile modification method proposed in this paper is verified by comparing the finite element method with the experimental prototype, and the realization mechanism of high load-bearing capacity of LSMTD is further discussed. This research proposes the tooth profile modification method and key meshing characteristic calculation model of LSMTD, which is of great significance for the structural optimization design of LSMTD.