Spiral arc bevel gear mechanism without relative sliding

The invention relates to a spiral arc bevel gear mechanism without relative sliding. The spiral arc bevel gear mechanism comprises a pair of transmission pairs composed of a small wheel and a large wheel. The axis of the small wheel and the axis of the large wheel are in orthogonality. Spiral arc teeth are evenly distributed on the outer surface of a small wheel cone. Spiral arc grooves are evenly formed in the outer surface of a large wheel cone. The center lines of the spiral arc grooves and the center lines of the spiral arc teeth are conical spiral lines, and the spiral arc teeth and the spiral arc grooves are matched. When the small wheel and the large wheel are installed, one pair of spiral arc tooth and spiral arc groove is meshed, a driver drives an input shaft, the small wheel and the large wheel to rotate, and transmission between orhtogonal shafts is achieved. The shape of the spiral arc teeth and the shape of the spiral arc grooves are determined through the transmission ratio and other parameters. During transmission of a spiral arc bevel gear, relative sliding of a tooth surface is avoided, and therefore tooth surface gluing, abrasion, plastic deformation and other failure forms are avoided. The spiral arc bevel gear mechanism has the advantages that the single-level transmission ratio is large, and the contact ratio and the bearing capability are high and is suitable for being popularized and applied to the field of tiny and micro machines and conventional machines.