Rolling element used for toroidal-type continuously variable tra

Details Rolling element used for toroidal-type continuously variable tra Rolling element used for toroidal-type continuously variable tra

1997-12-19

2000-04-18

Yee, Deborah

Metal treatment

Stock

Carburized or nitrided

148906, 148215, 148219, 148226, 148233, 476 40, 476 72, 384625, C23C 822, F16H 1538, F16C 3300

Patent

active

060510803

ABSTRACT:
The invention relates to a power roller used for a toroidal-type continuously variable transmission. This power roller has on its first side a groove for receiving a bearing, and the surface of the groove (bearing surface) has a carbon concentration which is not lower than that of the back surface of a second side opposed to the first side. The power roller has a hardened outer layer having first and second portions which are respectively defined by the bearing surface and the back surface. The first portion of the hardened outer layer has an effective depth which is not shallower than that of the second portion thereof. The power roller is prepared by the sequential steps of surface-hardening, quenching, and grinding. The surface-hardening process is one of carburizing and carbonitriding. The grinding includes the sequential steps of: (1) grinding at least one of first and second outer portions a quenched preform of the power roller to remove the same, such that there is obtained a datum that is at least one of the surface of the groove and the inner flat surface which are respectively exposed by removing the first and second outer portions; and (2) grinding a third outer portion of the quenched preform, based on the datum, thereby to remove the third outer portion. The bearing surface of the power roller becomes high in carbon concentration, and the first portion of the hardened outer layer of the power roller becomes sufficiently deep in effective thickness.

REFERENCES:
patent: 5556348 (1996-09-01), Kokubu et al.
patent: 5976053 (1999-11-01), Kino et al.
John J. Coy et al. "Fatigue Life Analysis for Traction Drives with Application to a Toroidal Type Geometry". Dec. 1976, pp. 1-31.
Japanese Industrial Standard (JIS) G 4805, 1970) 066-NM-97 (2) pp. 1036 & 1037 High Carbon Chromium Bearing Steels.

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