Date: 2013-08-20

The importance of the bearing pre-load and the pre-pressure on the stable operation

The key factors affecting bearing life for many rotating machinery products, their useful life is more dependent on the life of the bearing member of the key parts of the product. "Free" the bearings not refer bearings never damage or failure but not damage means at a certain time within. Here designers calculate the bearing service life of the bearing life of greater than or equal to overhaul cycle of mechanical products such bearings can be "maintenance-free" mechanical product overhaul and replace the bearings can be without bearing for maintenance.
Bearing internal clearance (called the working gap) before the installation of the imported bearings internal clearance (original gap) installed when the operating temperature is reached, the former big with different applications, many requirements negative running clearance, the load is applied, this the pre-load in order to ensure the bearing mated with the load condition to prevent damage due to slipping.
The main role: to improve the bearing stiffness and reduce operating noise, wear increases the gap in the compensation run, to improve the accuracy of the shaft of the boot, extended the life of imported bearings.
The pre-pressure often is the coefficient of the main indicators (dynamic load rating Cr), the best preload needed first calculate the pre-pressure trials to determine the normal value, through a different method of adjusting constantly revised.
Grease in advance in the bearing grease filling in a sealing manner, and the filling amount of grease inside the casing, every once in the supplement or replacement of the filling for grease. In addition, on many mechanical bearings need lubrication, also uses a pipeline connected to the lubrication at centralized greasing. Filling a grease lubrication can be done grease for a long time without refilling, and the structure of the sealing means is also relatively simple and therefore widely used. Oil lubrication is relatively simple. Frequent lubrication can increase the service life of the bearings.

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