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Dalian Hoyi Bearings Co., Ltd.
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Product (74)
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- Ball Bearing (12)
- Roller Bearing (29)
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Company Info
Dalian Hoyi Bearings Co., Ltd. [China (Mainland)]
Business Type:Manufacturer, Trading Company
City: Dalian
Province/State: Liaoning
Country/Region: China (Mainland)
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The calculated life for Deep groove ball bearings are based on the load it carries and its operating speed. The industry standard usable bearing lifespan is inversely proportional to the bearing load cubed. Nominal maximum load of a bearing (as specified for example in SKF datasheets), is for a lifespan of 1 million rotations, which at 50 Hz (i.e., 3000 RPM) is a lifespan of 5.5 working hours. 90% of bearings of that type have at least that lifespan, and 50% of bearings have a lifespan at least 5 times as long.
The industry standard life calculation is based upon the work of Lundberg and Palmgren performed in 1947. The formula assumes the life to be limited by metal fatigue and that the life distribution can be described by a Weibull distribution. Many variations of the formula exist that include factors for material properties, lubrication, and loading. Factoring for loading may be viewed as a tacit admission that modern materials demonstrate a different relationship between load and life than Lundberg and Palmgren determined .
