Toroidal continuously variable transmission and method for...

Details Toroidal continuously variable transmission and method for... Toroidal continuously variable transmission and method for...

2003-07-09

2009-02-10

Joyce, William C (Department: 3682)

Friction gear transmission systems or components

Friction transmission or element

Particular friction surface

C476S040000, C476S042000

Reexamination Certificate

active

07488270

ABSTRACT:
In a toroidal continuously variable transmission, rolling contact portions of an input disc4, an output disc7, and roller13are formed of bearing steel, which contains C: 0.8-1.5 wt %; Si: 0.5-2.5 wt %; Mn: 0.3-2.0 wt %; Cr: 1.9-2.5 wt %; Mo: 0.3-1.0 wt %; and a total of 1.0 wt % or more of Si and Mo; with the balance being iron and unavoidable impurities. A residual austenite in a range of depth Z=1.0L, where L is the major axis of a contact ellipse of the traction contact portion, from the surface of the rolling contact portion is 15 wt % or less, and the hardness of the range is HRC 58-62 by tempering a blank with a predetermined shape at a temperature of 250° C. or more after quenching the blank.

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European Search Report ; Application No. EP 03 01 5819 (May 30, 200).
JP 2000310307 Abstract ( Nov. 7, 2000).

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