The bearing clearance is divided into two categories: original clearance and working clearance. The original clearance jaw crusher has adjusted the bearing clearance when it leaves the factory. The working clearance is an important factor to ensure the normal operation of the jaw crusher bearing. Let's take a closer look at the bearing clearance and its different classifications and functions.
Original clearance
The jaw crusher bearing clearance has been adjusted and adjusted by the manufacturer before leaving the factory. The bearing clearance at this time is called the original clearance. Spherical roller bearings only have radial clearance, which is divided into 5 groups according to the standard radial clearance. After the bearing is assembled, its original clearance will be reduced. For the dynamic bearing, the eccentric shaft is assembled with an interference fit. Therefore, after the dynamic bearing is heated, the inner ring is expanded and mounted on the eccentric shaft, and the expansion of the inner ring reduces the original clearance of the bearing.
Working clearance
With the operation of the jaw crusher, the inner ring of the movable jaw bearing is continuously heated and expanded, the original clearance is gradually reduced, and the original clearance is gradually unable to meet the working needs. At this time, the bearing clearance needs to be adjusted by the operator to a suitable one. The position, that is, the clearance remaining after the assembly is reduced, that is, the clearance when the bearing is working, is called the working clearance.
Bearings have different specifications, generally given minimum and maximum radial clearance reduction, minimum radial clearance reduction can prevent unloading sleeve unloaded, bearing and eccentric shaft or bearing inner ring rotation, reduce bearing Hug. The maximum radial clearance reduction is to prevent the bearing inner ring from deforming and causing additional stress, preventing premature fatigue damage in the bearing.
Choice of working clearance
Because the working environment of the jaw crusher is poor, the temperature difference between the inner and outer rings of the bearing is relatively large, so a large working clearance should be left. When selecting the original bearing clearance, it is recommended to use the third set of clearance in the standard, which is usually called c3 specification, which can ensure that the working clearance is reduced after assembly to ensure the normal working of the bearing. .
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