ABSTRACT
Flank profiles are formed by two different involutes with different basic circles, like that of the coast profile N having a larger diameter. Gear wheels with asymmetric teeth are suitable for use when only one tooth flank is loaded. This is achieved both in unidirectional rotating gear trains and in hoisting mechanisms. For gears with asymmetric teeth, a different pressure angle is used for the two tooth profiles. In this way, a high transverse contact ratio ea and a high pressure angle a of the drive flank are simultaneously obtained, and a pointed tooth tip is avoided. High pressure angle reduces the contact stresses in the drive flank, and pressure angle of the coast flank αN is chosen to provide a sufficiently wide tooth root, which also leads to a reduction in the bending stress in the critic section.
