Precision gear, its gear mechanism, and production method of precision gear

US20070034304A1Inactive Publication Date: 2007-02-15NAMIKI SEIMITSU HOSEKI KK +3
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
NAMIKI SEIMITSU HOSEKI KK
Publication Date
2007-02-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

A metal-made high-precision gear and a gear mechanism are disclosed. The precision gear is made of a novel material which does not exist in conventional materials for precision gears, including resins and tool steels, has high hardness, strength and excellent surface smoothness, and is superior in workability. In the precision gear which is formed of an amorphous metal alloy having a ternary, quaternary or higher composition containing iron group elements, such as Fe, Co, Ni, and Cu, Ti, Zr, Hf, as the principal elements, the precision gear whose module is 0.2 or less is made of the amorphous metal alloy having a disordered structure which does not have a fixed regularity and whose XRD pattern is a halo pattern, namely exhibits a broad peak.
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Description

TECHNICAL FIELD

[0001] The present invention relates to a precision gear which is small-sized, subjected to a heavy load and required to have a long life-span, a gear mechanism employing the precision gear, and a method for manufacturing the precision gear. BACKGROUND OF THE INVENTION

[0002] In the field of precision gears which are used in precision devices requiring high accuracy, such as watches and micro-geared motors, metal-made precision-gears whose modules exceed 0.2 and which have excellent properties and accuracy are manufactured by various methods including pressing and forming by rolling, as well as electro-discharge forming, cutting, etc.

[0003] However, regarding forming of a metal-made gear whose module is 0.2 or less, it is difficult to practically employ the electro-discharge forming, cutting, pressing, and forming by rolling, since there are problems in terms of accuracy of the gear, manufacturing cost and the like. For this reason, resin-made precision-gears whose ...

Claims

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