文档介绍：Available online at hanism
and
Machine Theory
Mechanism and Machine Theory 43 (2008) 217–239
ate/mechmt
Centrifugal load and its effects on bending strength
and contact strength of a high speed thin-walled
spur gear with offset web
Shuting Li *
Nabtesco Co. Ltd., Oak-hills No. 202, Heki-cho 7028-2, TSU-shi, Mie-ken 514-1138, Japan
Received 24 May 2006; accepted 29 January 2007
Available online 26 March 2007
Abstract
This paper discusses effects of centrifugal load on bending strength and contact strength of a thin-walled spur gear used
at high speed. A three-dimensional (3D), finite element method (FEM) is presented in this paper for analyzing centrifugal
deformations and centrifugal stresses of the thin-walled gear at high speed and the responsive FEM software are developed
through many years’ efforts. It is verified that the developed FEM software can calculate correct centrifugal deformations
and centrifugal stresses of the thin-walled gear by a cantilever model. Then centrifugal deformations and centrifugal stres-
ses of a thin-walled spur gear with offset web are analyzed with the FEM software at speed range 5000–40,000 rpm. It is
found that effects of centrifugal load on deformations and stresses of the thin-walled gear can be neglected when gear speed
is below 10,000 rpm. But it is necessary to consider the effects of centrifugal stresses on strength design of the thin-walled
gear when the gear speed exceeds 10,000 rpm. Effects of the centrifugal load-deformed thin-walled spur gear on tooth con-
tact pattern, surface contact stress, root bending stress and tooth load-sharing ratio of the gear are also investigated
through performing loaded tooth contact analyses of the gear when it is engaged with a solid mating gear under a torque.
It is found that centrifugal deformation of the gear at high speed has greater effects on tooth contact pattern, tooth surface
contact stress, root bending stress and tooth load-sharing ratio of the pair