Bearing with the shaft is referred to as a journal

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In conjunction with the bearing axis is referred to as a journal. The journal is the basis of the assembly of the shaft, the shaft bearing support. Accuracy and surface quality are generally higher, the technical requirements are gen erally formulated according to the axis of the main function and working conditions, usually the following:special bearing
A) the dimensional accuracy
Usually its high dimensional accuracy requirements (the IT5 IT7 assembled transmission parts, the general requirements of the journal dimensional accuracy is lower (of IT6 IT9 from the supporting role of the journal in order to determine the axis position.
B) the geometrical accuracy
General should be limited to dimensional tolerances within its tolerance. High precision internal and external circular surface geometry precision of the shaft parts mainly refers to the journal, outer cone morse taper hole such as roundness, cylindricity. Its allowable deviation should be marked on the drawing.abec bearings
C) mutual positional accuracy
Otherwise it will affect the power transmission pa rts (gears, etc.) and transmission accuracy, the positional accuracy requirements of the shaft parts are mainly decided by the shaft in the machinery in position and function should normally ensure that the concentricity of the assembled drive member journalled on the bearing journal of the requirements . And generating noise. The shaft, the blending of the ordinary precision shaft section of the radial direction of the bearing journal beating generally 0.01 ~ 0.03mm precision axis (such as the spindle) is usually 0.001 ~ 0.005mm
4) the appearance of roughness
The general transmission parts mating shaft diameter surface roughness support shaft diameter Ra2.5 ~ 0.63μm with the bearings look roughness Ra0.63 ~ 0.16μmthin wall bearings