0
RESEARCH PAPERS

Dynamic Modeling of the Milner Continuously Variable Transmission—The Basic Kinematics

[+] Author and Article Information
S. Akehurst, D. A. Parker

Powertrain & Vehicle Research Center,  University of Bath, Calverton Down, Bath, BA2 7AY, UK

S. Schaaf

 Intersyn Technologies, 2736 Albans, Houston, TX 77005

J. Mech. Des 129(11), 1170-1178 (Sep 19, 2006) (9 pages) doi:10.1115/1.2771573 History: Received December 06, 2005; Revised September 19, 2006

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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

The Milner CVT: (a) Photograph of the Milner CVT; (b) MCVT schematic—low ratio (high gear); (c) MCVT schematic—high ratio (low gear)

Grahic Jump Location
Figure 2

Geometry of the outer raceway to planet ball contact

Grahic Jump Location
Figure 3

Inner raceway geometry

Grahic Jump Location
Figure 4

Geometry of idler follower to planet ball contact

Grahic Jump Location
Figure 5

Definition of kinematic relationships

Grahic Jump Location
Figure 6

Definition of spin velocities at the inner and outer races

Grahic Jump Location
Figure 7

Free body diagrams of components of the Milner CVT: (a) The input shaft of the transmission, including the fixed half of the inner raceway; (b) the free half of the inner raceway; (c) the fixed half of the outer raceway; (d) the free half of the outer raceway; (e) the inner ball-screw thread; (f) one planet ball; and (g) the idler follower

Grahic Jump Location
Figure 8

Layout of MCVT model

Grahic Jump Location
Figure 9

Forces in the MCVT: (a) Contact angles; (b) operating radii and ratio

Grahic Jump Location
Figure 10

Forces in the MCVT: (a) Normal forces; (b) traction forces

Grahic Jump Location
Figure 11

Speeds in the MCVT: (a) Rotational speeds; (b) spin speeds

Grahic Jump Location
Figure 12

Measured MCVT ratio compared to predicted ratio in an IVT configuration

Grahic Jump Location
Figure 13

IVT configuration

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In