Bearing inspection and regulations on bearing

Bearing inspection according to the ZBJII020 standard and the world's needle bearing manufacturing company ( Japan NTN, KOYO, Germany INA, the United States TORRINGTON) For stamping outer ring needle roller bearing inspection rules: stamping outer ring wall thin, easy to deformation, heat treatment measurement inspection before installation bearing outside diameter is meaningless. Measurement test measured bearing pressure should be brought into the standard seat hole to get the final size and geometric accuracy. Hole size deviation should comply with the regulations of recommendation ( See table 1) 。 Needle inscribed circle diameter approximate within tolerance zone F8. Recommended by the tolerance of hole and shaft, bearing materials ( Rigid bearing) Hole tolerance shaft steel or cast iron N6 tolerances ( N7) Without inner ring with inner ring or non-ferrous metal hole wall thickness less than 6 mm R6 ( R7 ) h5 ( h6) K5 ( j6) About stamping outer ring of bearing roller inscribed circle diameter deviation of the correct measurement inspection methods: 1 measurement should be made by measurement of bearings and standard parts at the same temperature, the measurement of standard temperature of 20 c. 2. Complete sets of single needle roller bearing group minimum diameter deviation of delta Fwmin examination, is to press the bearing into standard circle with extreme plug gauge to check. Complete sets of single needle roller bearing group minimum diameter deviation according to the provisions of table 2: needle group of nominal diameter delta Fwnin = Fwnin - Fw more than to the poor the poor 3 + 6, 28 + 106 10 + 31 + 18 + 34 1310 + 50 + 50 + 30 + + 41 2030 1618 2550 + 60 + 30