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Second-Generation RADIALcvt Continuously Variable Transmission Simulation and Test Results

Journal Article
06-13-02-0011
ISSN: 1946-3995, e-ISSN: 1946-4002
Published August 14, 2020 by SAE International in United States
Second-Generation RADIALcvt Continuously Variable Transmission Simulation and Test Results
Sector:
Citation: Naude, J. and Goodrich, R., "Second-Generation RADIALcvt Continuously Variable Transmission Simulation and Test Results," SAE Int. J. Passeng. Cars - Mech. Syst. 13(2):135-143, 2020, https://doi.org/10.4271/06-13-02-0011.
Language: English

Abstract:

The RADIALcvt is a traction drive continuously variable transmission (CVT) implemented in a new novel radial configuration mechanical assembly. The RADIALcvt functions as a multi-parallel power path (at least six) type of CVT, which consists of only one steel-on-steel, line contact, traction drive interface in each power path. A constant input radius on the traction drive input makes it possible to use a constant clamping force, which is provided by mechanical springs, thus eliminating the need for a hydraulic control system. The RADIALcvt has a very large radius variation on the traction drive output, which provides the ratio variation. The test and simulation results of the first RADIALcvt prototype was published in [1] and presented mechanical efficiencies above 90%. This article presents the simulation and test results of the second-generation RADIALcvt prototype, which presents mechanical efficiencies above 94% and includes measured parameters of mechanical efficiency, slip, traction curves, and ratio torque at different loads while providing excellent partial load versus mechanical efficiency properties. A methodology for predicting the efficiency map using the no load torque loss is also proposed.