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Yang Yuhu
Wu Xueyan
Zhang Ce
College of Mechanical Engineering,
Tianjin University,
Tianjin 300072, China |
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ANALYSIS ON
GEOMETY
CHARACTERISTICS OF ROLLER
GEAR INDEXING CAM MECHANISM*
Abstract: The characteristics of surface generation of roller gear cam are studied by applying meshing theory of conjugate surfaces. Transformation matrixes between indexing cam and rollers in turret are defined first. Then the enveloping condition between cam and rollers in turret is derived by enveloping theory. Based on above work, cam surface equations are built. According to the enveloping properties of this kind of mechanism, solid model of cam is obtained through Boolean operation. The application software is developed in the environment of solid edge and an example of a roller gear indexing cam used in engineering practice is given. The solid model generating using this method reflects the geometry characteristic and can be used in analysis of cam profile. This method can also be expanded to solid modeling of more complicated cam surface.
Key words:
Roller gear cam Conjugate surface Enveloping theory Solid model |