Browsing by Author "Lo, JS"

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A study on the bearing contact of roller gear cams
(2001)
Lo, JS
;
Tseng, CH
;
Tsay, CB
;
機械工程學系
;
Department of Mechanical Engineering
This study presents contact ellipse characteristics of the roller gear cams consisting of cambered rollers and screw cam surfaces. Principal curvatures and directions of generated cam surfaces are studied. The dimensions and the directions of contact ellipses are also evaluated. The investigation results are most helpful to understand contact nature, and contact stresses of the roller gear cam, which may be considered as design indices for performance consideration. (C) 2001 Elsevier Science B.V. All rights reserved.
A study on the Hertzian stress of the roller gear cam
(2000)
Lo, JS
;
Tseng, CH
;
Tsay, CB
;
機械工程學系
;
Department of Mechanical Engineering
This study presented the characteristics of Hertzian stress of roller gear cams that are composed of a cambered roller and a screwed 3D, cam surface. Based on the principal curvatures and directions of the generated cam surfaces and its cambered mating followers, pressure angle and contact force, the contact ellipses were derived. The investigated results are most helpful to the understanding of the contact nature and the contact stress of the roller gear cam which may be considered as design indices for further design consideration.
Non-undercutting conditions of roller gear cams
(2003)
Lo, JS
;
Tseng, CH
;
Tsay, CB
;
機械工程學系
;
Department of Mechanical Engineering
The undercutting conditions in a planar cam can be predicted by comparing the radius of the curvatures of the pitch curves with the radius of the cutter. For the complexity of the spatial cam generation, the principle radius of the curvatures and the directions of the generated cam surface are different from point to point along the pitch curve so that predicting the undercutting condition becomes very difficult. The undercutting conditions on the roller gear cams use the concept of limiting conjugate motion generation. In this study, the feasible design region without undercutting is presented. The investigation results are very useful to the designer and the manufacturing engineer for understanding the undercutting characteristics of the roller gear cam.