Microns about bearing life, how clearance is the most appropriate

01 what bearing clearance so-called bearing clearance, namely bearing without gear shaft and bearing box, to fix them one housing, then the party has not been fixed radial or axial move move. Knowledge of ▼ bearing series: clearance according to the moving direction, can be divided into radial clearance and axial clearance. Radial clearance is: in the absence of load when a fixed ring, a ring related to fixed ring along the radial direction from one extreme to another extreme location of the move. The axial clearance is: in the absence of load when a fixed ring, a ring related to fixed ring along the axial position from one extreme to another extreme position of the move. Bearing clearance code: C0: specification clearance code, the code in the bearing models omit do not sign the C2: clearance C3 clearance slightly smaller than the specification: clearance slightly larger than the standard clearance C4: than C3 clearance C5: slightly larger than the C4 slightly larger clearance ▼ rolling bearing radial clearance kingdom specification note: small companion with bearing type and inner diameter size and clearance level, corresponding to the corresponding form of bearing clearance specification values. 02 classification: bearing clearance is adjustable or not clearance adjustment method by bearing type resolution, can be divided into ordinary clearance is not adjustable bearings and adjustable bearing. ► Clearance is not adjustable bearing clearance is not adjustable bearing is bearing factory, bearing clearance is sure. Include: deep groove ball bearing, self-aligning bearings, cylindrical bearings. On an adjustable bearing clearance, industry have corresponding specification values ( The clearance of the five level) Scope, can also customize special clearance. When the shaft and bearing seat size is known, the appropriate amount of inner and outer ring with sure, device after clearance cannot change. Because in the design phase with quantity is a scope, the final clearance also exists a range, the clearance precision request is not applicable. ► Clearance adjustable bearing clearance adjustable bearing is able to move the relative axial bearing raceway position to achieve the requirements of clearance. Include: tapered bearings, angular contact ball bearings and a local thrust bearing. Adjustable bearing can well adapt to all kinds of precision request. After change of raceway of relative axial position, will be able to get a certain clearance value. When moving the position of the inner ring, roughly can be both positive and negative clearance. 03 bearing clearance and the choice of bearing in the same way, smooth smooth oil too much or too little can cause bearing temperature change, form the axis accept loss; Likewise, the bearing clearance is too large or too small, the working life of the bearing and the whole stability of the equipment will be reduced. From theoretical clearance minus the bearing assembly on the shaft or shell because of the interference fit within the ring of shrinkage or contraction after the clearance is called 'gear clearance'. Clearance on the device and subtract for bearing internal clearance after the size change from temperature difference called 'effective clearance'. Bearing assembly to accept certain load placed on mechanical clearance, the effective clearance and bearing load produced by the elastic deformation after the clearance is called 'work clearance'. ▼ bearing clearance measurement method when work clearance for micro negative, the bearing fatigue life expectancy. But with the increase of negative clearance fatigue life significantly to land at the same time. Consequently, when selecting the bearing clearance, ordinary work clearance is zero or slightly as advisable. In addition, the progress of bearing rigidity or reduce noise, further negative clearance to work; Fiercely in bearing heat up, work clearance should further take positive. To reach the ideal bearing life, must have appropriate clearance, clearance (= the clearance value design The factory clearance) — Inner ring with the clearance reduction - Caused by outer ring fit clearance reduction + ( Or - ） The clearance reduction (because of the difference in temperature Or increase) Selection of detailed clearance based on the equipment specification.