Development of the Ball Toroidal Continuously Variable Transmission

Paper #:
  • 981479

Published:
  • 1998-04-08
Citation:
FEL, L., "Development of the Ball Toroidal Continuously Variable Transmission," SAE Technical Paper 981479, 1998, https://doi.org/10.4271/981479.
Author(s):
Pages:
12
Abstract:
This paper presents a new concept of continuously variable transmission called the Ball Toroidal Continuously Variable Transmission (ball TCVT). The ball TCVT design is derived from the half-toroidal traction drive (Conventional TCVT). It embodies a new construction principle for the friction element engaging with the toroidal discs. The conventional rollers are being replaced by sphere / balls / cage assemblies. This new construction radically improves the transmission capability. Effortless speed ratio control, integrated neutral/clutch/reverse functions, increased versatility and reduced internal loads are the most significant gains. The paper will first describe the ball TCVT construction and explain its mode of operation. A second part will show the advantages and performances of the ball TCVT in comparison with the conventional TCVT. A third part will report the development status of this project.
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