Gear made of spheroidal graphite cast iron
Abstract
Abstract Translated from Japanese (57)【要約】 【課題】 歯の表面に歯面に沿った高周波焼 入れ層が形成されたモジュール1〜5の球状黒鉛鋳鉄材 からなる歯車であって、騒音が小さく、かつ充分な曲げ 疲労強度を有して、高負荷、高回転歯車として好適な歯 車を安価に得る。 【解決手段】 歯車の高周波焼入れ層以外の部位 を、基地組織がパーライトとフェライトを含み、フェラ イトの面積率を0.1〜15%、好ましくは0.1〜1 0%とし、高周波焼入れ層の厚みが、歯元部で表面から モジュール比0.03〜0.35、またはさらに基準ピ ッチ円直径部で表面からモジュール比0.03〜0. 7、歯先部で表面からモジュール比0.03〜1.5と し、高周波焼入れ層の硬さをHv550以上、歯元部の 圧縮残留応力を300〜1500MPaとする。 PROBLEM TO BE SOLVED: To provide a gear made of a spheroidal graphite cast iron material of modules 1 to 5 in which an induction hardened layer is formed on a tooth surface along a tooth surface, which has low noise and sufficient bending fatigue. A gear having strength and suitable as a high-load, high-rotation gear can be obtained at low cost. SOLUTION: A portion other than the induction hardened layer of the gear has a base structure containing pearlite and ferrite, and the area ratio of ferrite is 0.1 to 15%, preferably 0.1 to 1%. 0%, and the thickness of the induction hardened layer is 0.03 to 0.35 from the surface at the root of the tooth, or 0.03 to 0.3 mm from the surface at the reference pitch circle diameter portion. 7. The module ratio is from 0.03 to 1.5 at the tooth tip from the surface, the hardness of the induction hardened layer is Hv550 or more, and the compressive residual stress at the root is 300 to 1500 MPa.
Inventors
- 👤 Eiji Nakano
- 👤 英治 中野
- 👤 Yoshitaka Misaka
- 👤 佳孝 三阪
- 👤 Yutaka Kiyozawa
- 👤 裕 清澤
- 👤 Kunihiko Tsutsumi
- 👤 邦彦 堤
- 👤 Kazuhiro Kawasaki
- 👤 一博 川嵜
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