Precision bearings according to ISO grading standards are divided into: P0, P6, P5, P4, P2. Rank higher in turn, where P0 is the general accuracy, other grades are precision level. Of course, different classification standards, different types of bearings, their classification method somewhat different, but the meaning is to the. The use of performance requirements of precision bearings rotating body with high runout accuracy, high-speed rotation and small changes in friction and friction.
2013年9月15日星期日
Bearing radial internal clearance as the bearing journal
Precision bearing radial internal clearance as the bearing journal on the cone move forward and narrowed. By measuring the decrease a value, you can determine the degree of interference and the tightness of fit . For tapered bore bearings, inner mounting always interference fit . With cylindrical bore bearings are different, tapered bore bearings of the degree is not selected by the shaft with tolerances of the decision, but by the conical journal bearings , sleeve or withdrawal sleeve advance distance decision.
Install self-aligning ball bearings , CARB toroidal roller bearings, spherical roller timken clutch bearing nd precision with a tapered bore cylindrical roller bearings , to determine the value of reduced radial internal clearance or the axial conical base advance distance , as measured by the amount of interference scale . Clearance and axial advance distance reduction value guideline value has the following parts:
1 , small bearings
Small bearings can use nuts to advance it to the conical base . In the case of using the sleeve , then the sleeve nuts . Small withdrawal sleeve nut into the bearing hole available . Available hook wrench or pneumatic wrench to tighten the nut . Before starting the installation , you should at the surface of the journal and the sleeve slightly a little oil .
2 medium-sized bearings
Large timken bearing mounting force required to increase significantly , and should use hydraulic nut and / or using the oiling method :
( 1) When using a hydraulic nut mounting the bearings, it must be positioned on the threaded portion of the journal or a threaded sleeve , so that the annular piston against the bearing inner ring , the shaft nut or ring mounted on the shaft end . Through the oil pump oil into the hydraulic nut to secure , install the required precision of the force, the piston moves in the axial direction . Using hydraulic nuts, spherical roller bearings installed
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