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Strength research is always one of the study focuses of face gear drives. However, a strength calculation solution, in which bending stresses, contact stresses, and bulk temperatures are included, combined with gear design standards for face gear drives, is still not constructed due to complex face gear teeth. Thus, in this study, an equivalent face gear tooth is proposed by assessment of geometric characteristics of face gear teeth and tooth contact analysis, and a strength calculation solution of face gear drives, which is based on ISO 6336 standard associated with the proposed equivalent face gear teeth, is constructed. The fidelity of the proposed strength calculation solution of face gear drives is verified by comparing its results with the benchmark of results by finite element methods. Furthermore, the impact of geometric parameters on the strength of face gear drives is investigated, and some design suggestions are extracted. These contributions would benefit the improvement of engineering applications of face gear drives.

The relative sliding between tooth surfaces is the main cause of tooth wear and power loss, which directly affects the transmission efficiency and durability of gear. The aim of this paper is to provide a method to design such spur gear with low sliding ratio (LSR). Based on kinematics, differential geometry and contact path, the general mathematical models of the generating rack, the pinion and the mating gear tooth profiles are established in turn. Then, according to the relationship between the contact path and sliding ratio, a contact path described by a cubic function is proposed to construct a spur gear drive with low sliding ratio. In order to ensure the continuity of action and non-interference, solid models of the mated gear pair are established, and the motion simulation is carried out by an example. Moreover, the effects of the contact path function coefficients on sliding ratio, tooth shape, and contact ratio are analyzed. Meshing efficiency and tooth wear of LSR gear drive are evaluated by comparing with those of the involute gear drive. The results show that, this LSR spur gear drive has higher transmission efficiency and better anti-wear performance.