Bearing fit error range

Bearing and the shaft or the cooperation purpose is to put the inner and outer ring of the bearing firmly fixed on the shaft or bearing seat, make each other not harmful. Such as cooperate with sliding surface, will produce abnormal heat and wear and tear, and the powder into the bearing inner and worn cause early damage and the vibration and other ills, lead to bearing cannot give full play to its function. In addition, the matching of the bearing can affect the bearing radial clearance, radial clearance is not only related to the operation precision of bearing, and affect the service life of it. Rolling bearing is a standard components, so with the related parts fit inside hole and outside respectively is the datum holes and datum axis, in cooperating with it. Decided to fit the main problem is the bearing inner and outer ring on the load condition. In general, large size, large load, vibration, high speed or working temperature higher some persons to be tight, but often remove or swimming ring, the use of the loose fit. 1. The provisions of the benchmark in the comparative measurement method for measuring bearing size tolerance for, dosage of rules or standard for comparison measuring the size of the benchmark, the gauge block must conform to the standard JB/T1078 'gage block' regulation, standard parts must comply with the provisions of the competent department of factory. 2. The provisions of the measuring instrument used in the measurement instrument must be calibrated, and have to adapt themselves to the test bearing precision and magnification ratio. 3. The provisions of the measuring area for bearing inner diameter or outer diameter measurement, domestic regulations leave the ring on the southern side of one of the biggest chamfering coordinates within the area of measurement, and foreign many regulations to leave the ring twice in two end chamfering coordinates within the area of measurement. 4. Allow the measurement error in principle error of measurement may be allowed in the tolerance of less than 10%. 5. Probe radius and the pressure of the inventory in order to reduce the measurement error, must be within the scope of the possible, makes every effort to reduce inventory pressure Force is measured and the increase of gauge head radius of curvature.