A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
ELECTRIC POWER STEERING DEVICE
PROBLEM TO BE SOLVED: To provide an electric power steering device which is improved in the electrocorrosion resistance, fletching resistance, impact resistance or the like of a motor bearing, excellent in quietness more than before, and also improved in durability.SOLUTION: A rolling body of a motor bearing is constituted of a first phase containing zirconia and a sintering auxiliary agent, and a second phase composed of aluminum, and formed of a sintered body in which mass ratios of the first phase: second phase=50: 50 to 95: 5 (mass ratio), a content of the sintering auxiliary agent in the first phase is 1 to 5.5 mol%, a total number of a solid zirconia mass and a solid aluminum mass having grain diameters of 10 to 30 μm is not larger than 15 per cross section 300 mmof the rolling body, and a Young's modulus (E/E) with respect to a Young's modulus of SUJ2 is not higher than 1.4.SELECTED DRAWING: Figure 1
【課題】モータ用軸受の耐電食性、耐フレッチング性及び耐衝撃性等を向上させ、これまでよりも静粛性に優れ、耐久性も向上させた電動パワーステアリング装置を提供する。【解決手段】モータ用軸受の転動体を、ジルコニアと焼結助剤とを含む第１相と、アルミナからなる第２相とで構成され、かつ、第１相：第２相＝５０：５０〜９５：５（質量比）、第１相中の焼結助剤の含有量が１〜５．５モル％、粒径１０〜３０μｍの中実のジルコニア塊及びアルミナ塊の合計個数が該転動体の断面３００ｍｍ２当たり１５個以下、ＳＵＪ２のヤング率に対するヤング率（Ｅ／ＥＳＵＪ２）が１．４以下の焼結体で形成する。【選択図】図１
ELECTRIC POWER STEERING DEVICE
PROBLEM TO BE SOLVED: To provide an electric power steering device which is improved in the electrocorrosion resistance, fletching resistance, impact resistance or the like of a motor bearing, excellent in quietness more than before, and also improved in durability.SOLUTION: A rolling body of a motor bearing is constituted of a first phase containing zirconia and a sintering auxiliary agent, and a second phase composed of aluminum, and formed of a sintered body in which mass ratios of the first phase: second phase=50: 50 to 95: 5 (mass ratio), a content of the sintering auxiliary agent in the first phase is 1 to 5.5 mol%, a total number of a solid zirconia mass and a solid aluminum mass having grain diameters of 10 to 30 μm is not larger than 15 per cross section 300 mmof the rolling body, and a Young's modulus (E/E) with respect to a Young's modulus of SUJ2 is not higher than 1.4.SELECTED DRAWING: Figure 1
【課題】モータ用軸受の耐電食性、耐フレッチング性及び耐衝撃性等を向上させ、これまでよりも静粛性に優れ、耐久性も向上させた電動パワーステアリング装置を提供する。【解決手段】モータ用軸受の転動体を、ジルコニアと焼結助剤とを含む第１相と、アルミナからなる第２相とで構成され、かつ、第１相：第２相＝５０：５０〜９５：５（質量比）、第１相中の焼結助剤の含有量が１〜５．５モル％、粒径１０〜３０μｍの中実のジルコニア塊及びアルミナ塊の合計個数が該転動体の断面３００ｍｍ２当たり１５個以下、ＳＵＪ２のヤング率に対するヤング率（Ｅ／ＥＳＵＪ２）が１．４以下の焼結体で形成する。【選択図】図１
ELECTRIC POWER STEERING DEVICE
電動パワーステアリング装置
SAKAI YUTA (author) / ENDO YUICHI (author) / SHIMIZU YASUYUKI (author)
2016-08-12
Patent
Electronic Resource
Japanese