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| A parametric study on the contact stress of half toroidal continuously variable transmission | |
| 作者姓名： | Nabil Abdulla Atti QIN Datong SHI Wankai LI Huaying The State Key Laboratory of Mechanical Transmission Chongqing University Chongqing P.R. China Faculty of Engineering Helwan University Matari Egypt College of Agricultural Engineeri |
| 作者单位： | Nabil Abdulla Attia 1，2，QIN Datong 1，SHI Wankai 1，LI Huaying 3 1The State Key Laboratory of Mechanical Transmission，Chongqing University，Chongqing 400044，P.R. China 2Faculty of Engineering，Helwan University，Mataria，Egypt 3College of Agricultural Engineering，Southwest Agricultural University，Chongqing 400716，P.R. China Received 27 June 2003; revised 17 November 2003 |
| 基金项目： | the Ford-NSFC Foundation of China (No. 50122151). |
| 摘 要： | 1. Introduction A toroidal continuously variable transmission (CVT) that uses a traction drive to transmit torque has a vastly larger torque capacity than a conventional CVT. This transmission technology has attracted considerable interest owing to its capability in substantially improving vehicle fuel economy and power performance 1]. The half toroidal CVT transmits torque by means of shear resistance of the traction fluid film taking advantage of the property of the fluid solidificatio… |
A parametric study on the contact stress of half toroidal continuously variable transmission |
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| Nabil Abdulla Atti,QIN Datong,SHI Wankai,LI Huaying The State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing,P.R. China Faculty of Engineering,Helwan University,Matari,Egypt College of Agricultural Engineeri.A parametric study on the contact stress of half toroidal continuously variable transmission[J].Journal of Chongqing University,2003,2(2). | |
| Authors: | Nabil Abdulla Atti QIN Datong SHI Wankai LI Huaying The State Key Laboratory of Mechanical Transmission Chongqing University Chongqing PR China Faculty of Engineering Helwan University Matari Egypt College of Agricultural Engineeri |
| Institution: | 1. The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, P.R.China;Faculty of Engineering, Helwan University, Mataria, Egypt 2. The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, P.R.China 3. College of Agricultural Engineering, Southwest Agricultural University, Chongqing 400716, P.R.China |
| Abstract: | The most general contact in mechanical transmission is the elliptical one. In particular, a toroidal continuously variable transmission (CVT) has an elliptical shape in the contact area under the elastohydrodynamic lubrication regime, where the shearing of the fluid subjects to high contact stress and transmits the power. Many parameters affect the contact service performance of the half toroidal CVT, which include the properties of the contacting material (Young's modulus), operating parameters (input torque and maximum traction coefficient) and geometrical parameters (aspect cavity ratio, curvature ratio and half cone angle of the power roller). In this paper, the contacts between the input disk, the power roller and the output disk are formulated using the classical Hertzian contact theory. Based on the formulated equations, different system parameters, which affect the maximum Hertzian stresses, are compared. The comparative results will provide some observations of the relations between the maximum Hertzian stresses and transmission ratios in the form of graphs. These graphs give useful information for designer to know the maximum Hertzian stress during operation in such s ystems. |
| Keywords: | CVT Half toroidal elliptical contact Hertzian stress operating parameters |
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