Shaft, Housing, and Bearing Fit
Source: Bearing Network | Time: 2013-02-17
When the shaft and housing are not accurately aligned, it can lead to improper functioning of the system. For example, if there are shoulders on the shaft and they are not machined correctly, the inner and outer rings of the bearing may become misaligned. This can cause stress concentration, reduce the bearing's fatigue life, and in severe cases, result in cage damage or even seizure. The fit between the shaft, housing, and bearing is crucial for proper performance. In motor applications, the typical fit for the shaft is usually K5 or K6, while the fit between the bearing and the housing is commonly K7. For a 6309 bearing, the precision requirements are as follows: - Shaft roundness: 4–7 μm - Shaft cylindricity: 4–7 μm - Shaft shoulder runout: 4 μm - Housing roundness: 7–11 μm - Housing cylindricity: 7–11 μm - Housing shoulder runout: 4–7 μm Additionally, the chamfers on both the shaft and housing should not interfere with the bearing’s chamfers. The radius of the chamfer must not exceed the minimum specified value for the bearing. Proper fit ensures smooth operation, reduces wear, and extends the service life of the bearing. It also prevents unnecessary vibrations and noise, which are common issues when tolerances are not met.
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In summary, the correct fit between the shaft, housing, and bearing is essential for reliable and efficient operation. Proper machining and alignment ensure that the bearing performs optimally, reducing the risk of failure and increasing its longevity. Always follow manufacturer specifications and use accurate measuring tools to achieve the desired fit.
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