| 摘要 |
A worm drive includes a cylindrical worm and a worm gear, having arcuated corresponding engaging tooth flank profiles, with a mesh or contact line in the engaging region. The flanks of the teeth of the worm gear each consist of at least two flank parts engaging with the flanks of the worm gear teeth. One flank part, in the axial section through the worm, has a profile inclined relative to a perpendicular to the worm axis and which profile may be rectilinear, slightly convex, or slightly concave. The other flank part, in the axial section through the worm, has a sharply curved profile. The mesh or contact line reverses in the engaging region. The flank part having the sharply curved profile may be convex toward the worm gear or may be concave toward the worm gear. Alternatively, the flank part having the sharply curved profile may include a part convex toward the worm gear, a part concave toward the worm gear, and a substantially rectilinear part interconnecting the convex and concave parts. As a modification, the profile of the worm, in the axial section through the worm, may comprise a single curve having one part sharply curved and the other part slightly curved. |
