Development of a Shrink Fitter for Ceramics Bearings

陶瓷轴承热缩钳的开发

• 批准号: 07555053
• 负责人: NITTA Isami
• 金额: $ 4.8万
• 依托单位: Niigata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555053/
• 关键词: Ceramic Bearing; Shrink Fitter; Elevated Temperature; Interstice; Vibration

All ceramic ball bearings of Si_3N_4, type 6204, were used to examine an effects of a shrink fitter, a new machine element, on the bearing life. The shaft and the housing were made of a high Cr steel, SUJ2. The material of the cage of the ceramic bearing was stainless steel, SUS304. Two kinds of oils were used as lubricants. A rotational speed of a test machine was 7,000 rpm.The interferences between the ceramic bearing and a metal shaft, and between the ceramic and a metal housing, will increase and decrease at elevated temperature, since their coefficient of thermal expansions are different from each other. The interstice between the ceramic bearing and the metal housing can be thought to cause a large bending moment of the outer race of the bearing and lead to a failure of the outer race. If the shrink fitter of aluminum alloy, A2017, is placed at the interface between the bearing and the housing, such interstice will never appear even at the elevated temperature, because of the sufficient thermal expansion of the shrink fitter. Therefore the bending moment of the outer race, which shorten the bearing life will never exist.We confirmed the effect of the shrink fitter on the bearing life experimentally. The life of the ceramic bearing with the shrink fitter was longer than that without the shrink fitter.

本文用6204型Si_3N_4全陶瓷球轴承，研究了一种新的机械元件-热装对轴承寿命的影响。轴和外壳由高铬钢SUJ 2制成。陶瓷轴承保持架的材料为不锈钢SUS 304。两种油被用作润滑剂。试验机的转速为7，000 rpm。陶瓷轴承与金属轴之间以及陶瓷与金属外壳之间的干涉会随着温度的升高而增加和减少，因为它们的热膨胀系数彼此不同。陶瓷轴承和金属外壳之间的摩擦可以被认为会引起轴承外圈的大弯矩，并导致外圈失效。如果在轴承和轴承座之间的界面处放置A2017铝合金的收缩配件，即使在高温下也不会出现这种裂纹，因为收缩配件有足够的热膨胀。因此，缩短轴承寿命的外圈弯矩将永远不存在。我们通过实验证实了热套对轴承寿命的影响。使用过盈配合的陶瓷轴承的使用寿命比不使用过盈配合的陶瓷轴承的使用寿命长。

项目成果

新田勇、佐藤秀則、竹林博明: "シュリンクフィッタを用いたセラミックスベアリングの長寿命化" 日本機械学会第74期全国大会講演論文集(IV)No.96-15. 19-20 (1996)

Isamu Nitta、Hidenori Sato、Hiroaki Takebayashi：“使用收缩钳来延长陶瓷轴承的寿命”第 74 届日本机械工程学会全国会议论文集 (IV) 第 96-15 号（1996 年）。