Abstract
This chapter demonstrates a method for screw rotor profile generation that simplifies and improves design procedures. An example is given of its use in the development of a new ‘N’ rotor profile, which is shown to be superior to other well-known types. Twin-screw expander rotors are effectively helical gears. When these are formed from a hobbing cutter, the hobbing tool and the rotor together constitute a pair of crossed helical gears. The envelope gearing method is used to derive a meshing condition for crossed helical gears, which is then used to create the profile of a hobbing tool. A reverse transformation enables calculation of the rotor profile thus manufactured. Simplification of the main gearing condition leads to a meshing expression for helical gears that may be used for the design of screw expander rotors.
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