High-cleanness steel and toroidal type continuously variable tra

Details High-cleanness steel and toroidal type continuously variable tra High-cleanness steel and toroidal type continuously variable tra

1998-11-06

2000-12-26

Fenstermacher, David M.

Friction gear transmission systems or components

Friction transmission or element

Particular friction surface

476 70, 476 40, F16H 5532

Patent

active

061651001

ABSTRACT:
At least one of input/output disks, a power roller and a cam disk of a toroidal type continuously variable transmission is formed of a high-cleanness steel in which a size of a maximum inclusion is estimated by the following extremum statistical process. In step S1, a plane including a central line of the high-cleanness steel is cut out in a direction of rolling of the high-cleanness steel. In step S2, a portion d of the cut-out cross-section, which is defined by 40% of a diameter D in the vicinity of the central line, is used as a to-be-tested surface. In step S3, a test reference area S.sub.0 is set at an area not less than 300 mm.sup.2 within the to-be-tested surface, and a root of an area of the maximum inclusion is measured five times or more. In step S4, a maximum inclusion distribution straight line is obtained. In step S5, the root, that is, the size of the area of the maximum inclusion within an estimation area S is estimated.

REFERENCES:
patent: 5256213 (1993-10-01), Narai et al.
patent: 5556348 (1996-09-01), Kokubu et al.
patent: 5855531 (1999-01-01), Mitamura et al.
patent: 5976053 (1999-11-01), Kino et al.
patent: 6029714 (2000-02-01), Imamura et al.
Murakami, Yukitaka, "Metal Fatigue: Effects of Small Defects and Nonmetallic Inclusions", Inclusions Micro-defects and Inclusion, Mar. 8, 1993.

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