The determination of hob offset design values for nonstandard spur gears

It is easy for a designer to design a set of spur gears to operate properly at a standard center distance. But the problem is more complicated when a predetermined center distance is necessary that is not considered standard. When the gears are cut, the hob can he advanced into or withdrawn from the blank to give teeth of a necessary thickness so that the gears will mesh properly at the nonstandard center distance. A derivation for determining the sum of the hob offsets for the pinion and gear has been shown by several authors, but there is no mathematical expression to separate the total hob offset into the individual hob offsets needed on the pinion and the gear. Several authors describe the advantages of designing gears with a substantial length of recess and a minimal length of approach. They describe the gears as operating with lower friction, less wear, less noise, and smoother action. Accordingly, the object of this investigation was to determine the individual hob offsets of the pinion and gear based on a high ratio of recess ·action to approach action. A computer program was used to produce design charts and tables to be used by the designer so that he can easily determine the individual hob offsets necessary for particular numbers of teeth and changes in center distance.

Name thesis:degree_name

M.S.

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Mechanical Engineering

Department dc:contributor.department

Mechanical Engineering

Grantor dc:publisher

Virginia Polytechnic Institute and State University

Year dc:date.issued

1972

Author dc:creator

• Siegel, Robert Edward

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Handle dc:identifier.uri

https://hdl.handle.net/10919/118324

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/118324