Toroidal-type continuously variable transmission

Details Toroidal-type continuously variable transmission Toroidal-type continuously variable transmission

1994-08-31

1996-09-17

Herrmann, Allan D.

Friction gear transmission systems or components

Friction gear includes idler engaging facing concave surfaces

Toroidal

148319, 384625, 3849071, 476 73, F16H 1538, F16C 3300, C23C 822

Patent

active

055563481

ABSTRACT:
A toroidal-type continuously variable transmission provides an input side disk disposed on an input shaft, an output side disk disposed on an output shaft, and a power roller for transmitting motive power of the input shaft to the output shaft while engaging both the input side disk and the output side disk, in which the input side disk, the output side disk, and the power roller made of a material are subjected to either a carburizing and grinding process or to a carbonitriding and grinding process so that effective carburized depths of the input side disk, the output side disk, and the power roller are limited to a range between 2.0 mm and 4.0 mm. The toroidal-type continuously variable transmission is capable of improving not only the rolling contact lives of the traction surfaces of the input and output side disks as well as the traction surfaces of the power rollers, but also the fatigue fracture lives of the input and output side disks and power rollers.

REFERENCES:
patent: 4916981 (1990-04-01), Suzuki et al.
patent: 5030017 (1991-07-01), Murakami et al.
patent: 5084116 (1992-01-01), Mitamura
patent: 5122000 (1992-06-01), Matsumoto et al.
"Heat Treatment of Steels" (Revised Fifth Edition), The Iron and Steel Institute of Japan, published Jan. 30, 1989.
"Fatigue Life Analysis for Traction Drives With Application to a Toroidal Type Geometry", Coy et al., NASA Technical Note, NASA TN D-8362, Dec. 1976.
Antriebstechnik 22 (1983), No. 1, pp. 35-41.
Stuwe, Einfuhrung in die Werkstofftechnik, Bibliografisches Institut Mannheim, 1969, pp. 95-96.

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