Dynamic modeling of the Milner continuously variable transmission - The basic kinematics

In the Milner continuously variable transmission altering the axial separation between two moveable halves of the outer race set allows the radial position of the planet balls to vary, along with the contact positions on the inner and outer races and, hence, the transmission ratio changes. An inelastic analytical model implemented in SIMULINK is presented which allows the component positions, speeds, forces, and torques to be calculated. Use of a free body approach for individual components allows both individual and coupled component motions to be studied. Examples of the steady-state results and experimental verification are presented. Use of the model for dynamic investigations and to improve future versions of the transmission is discussed.

[1]  Kazuhiko Ueda,et al.  Transient analysis of geared neutral type half-toroidal CVT , 2002 .

[2]  Masaki Nakano,et al.  Improvement of loading cam performance in a toroidal CVT , 2002 .

[3]  Kenichi Matsuda,et al.  Analysis of the efficiency of a half-toroidal CVT , 2001 .

[4]  Sam Akehurst,et al.  Modelling of loss mechanisms in a pushing metal V-belt continuously variable transmission. Part 1: Torque losses due to band friction , 2004 .

[5]  D Dowson,et al.  Elastohydrodynamic Lubrication of Elliptical Contacts with Spin and Rolling , 1991 .

[6]  Jonathan Newall,et al.  Measurement and prediction of spin losses in the EHL point contacts of the full toroidal variator , 2003 .

[7]  Sam Akehurst,et al.  Performance Investigations of a Novel Rolling Traction CVT , 2001 .

[8]  Sam Akehurst,et al.  Modelling of loss mechanisms in a pushing metal V-belt continuously variable transmission. Part 3: Belt slip losses , 2004 .

[9]  Giuseppe Carbone,et al.  A comparison of the performances of full and half toroidal traction drives , 2004 .

[10]  J. L. Tevaarwerk,et al.  The Influence of Fluid Rheology on the Performance of Traction Drives , 1979 .

[11]  Lubomyr O. Hewko,et al.  Automotive Traction Drive CVTs - An Overview , 1986 .

[12]  Hirohisa Tanaka.  Speed ratio control of a parallel layout double cavity half-toroidal CVT for four-wheel drive , 2002 .

[13]  J. L. Tevaarwerk.  Traction drive performance prediction for the Johnson and Tevaarwerk traction model , 1979 .

[14]  Sam Akehurst,et al.  Modelling of loss mechanisms in a pushing metal V-belt continuously variable transmission: Part 2: Pulley deflection losses and total torque loss validation , 2004 .

[15]  Sam Akehurst,et al.  CVT Rolling Traction Drives—A Review of Research Into Their Design, Functionality, and Modeling , 2006 .