Browsing by Author "Chao, Li-Chi"

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STRESS ANALYSIS OF SPHERICAL GEAR SETS
(2010)
Chao, Li-Chi
;
Tsay, Chung-Biau
;
機械工程學系
;
Department of Mechanical Engineering
The spherical gear is a new type of gear proposed by Mitome et al. [1]. Different from that of the conventional spur or helical gear sets, the spherical gear set can allow variable shaft angles and large axial misalignments without gear interference during the gear drive meshing [1, 2] Geometrically, the spherical gear has two types of gear tooth profiles, the concave tooth and convex tooth In practical transmission applications, the contact situation of a spherical gear set is very complex. To obtain a more realistic simulation result, the loaded tooth contact analysis (LTCA) has been performed by employing the finite element method (FEM). According to the derived mathematical model of spherical gear tooth surfaces, an automatic meshes generation program for three-dimensional spherical gears has been developed Beside, tooth contact analysis (TCA) of spherical gears has been performed to simulate the contact points of the spherical gear set. Furthermore, the contact stress contours of spherical gear tooth surfaces and bending stress of tooth roots have been investigated by giving the design parameters, material properties, loadings and boundary conditions of spherical gears.
Tooth flank, undercutting and tooth pointing of spherical gears
(2011-04-01)
Chao, Li-Chi
;
Tsay, Chung-Biau
;
機械工程學系
;
Department of Mechanical Engineering
By the developed mathematical model of spherical gears from literature [16], conditions of tooth undercutting of spherical gears with convex and concave teeth and tooth pointing conditions of the proposed concave spherical gear are derived. Besides, tooth flank profile deviations, limit curves of tooth undercutting and the beginning points of tooth undercutting and tooth pointing of the proposed spherical gear can be obtained by applying the spherical gear tooth mathematical model and the developed computer simulation programs, as illustrated by five numerical examples. (C) 2010 Elsevier Ltd. All rights reserved.