The deformation coordination equation of worm gear for rolling cone worm gearing is introduced, and the formulae of forces analysis and the rolling - and - sliding friction coefficient are given.

There is only approximate way to work out the normal chordal tooth thickness of worm and wormwheel at present.

This paper discusses the mesh theory, mesh parameters and strength of ring worm and roller worm gear drives, and provides the calculation formulas for the design of this kind of drives.