No.1015E 2018Special Edition on Enviromental Technologies Low Torque and Low Noise Technology for Ball Bearings Under Grease Lubrication |
| Category | TECHNICAL PAPER |
|---|---|
| Author | K. MIYAKE T. TSUDA K. YOSHIZAKI Material R&D Dept., Research & Development Headquarters |
| Abstract | A study was conducted to verify the effect of grease on the low torque property and low noise property which are particularly highly sought bearing performances. We focused on the viscoelasticity of grease as the dominating factor of bearing rotational torque. As a result, we clarifi ed that the higher the viscoelasticity, the lower the torque, and that grease families with short carbon chains were superior in terms of low torque characteristic. Moreover, bearing noise increases when grease thickener becomes trapped between the raceway and rolling element causing the oil film thickness to vary, therefore low noise was better achieved if thickeners with low Young’s modulus and small particle size were used as this minimizes oil film variance. |
| Keyword | grease, bearing torque, grease noise, young modulus, particle size |
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