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Introduction to the motor shaft main control factors of size

The accuracy and roughness of shaft are higher than other parts, shaft and other parts are also more closely, the processing must grasp the following elements.

● coaxiality of working surface. The main working surfaces are the bearing position (the surface that matches the bearing) and the shaft extension position (the surface that matches the driving wheel). Such as axial and radial runout on the surface of the surface of bearing a (eccentric) is too large, will produce vibration and noise in the motor running, in addition, the rotor core, slip ring, commutator and fan parts radial runout is too large, although in the rotor fine car fixed cylindrical these parts, but it will cause more initial unbalance, if the rotor core, collector ring, commutator, fan and so on after finishing assembly on the shaft, that is not, ask to beat these parts of diameter is too large, will greatly affect the reliability of the motor running.

● size accuracy and cylinder control of matching parts. The dimensional accuracy and shape accuracy of shaft extension position, bearing position and iron core position should be accurate, otherwise it will be difficult to assemble, and even cause damage of parts, loose or inflexible operation of bearing, and excessive temperature rise of bearing

● axis roughness control. The roughness of the mating surface is not high, easy to wear, and the fitting part will become loose. The roughness of the non-mating surface is too low, which will reduce the fatigue strength of the shaft.

● round corners of shaft shoulder position and overpass groove of grinding wheel should be processed according to the specified size. Too small radius and too deep grinding wheel groove will reduce the shaft strength; Too large radius of rounded corners will make the end contact of the mating parts unstable. The overrunning groove of grinding wheel is necessary to prevent the side of grinding wheel from rubbing against shaft shoulder. The dimensions of the overpass groove shall be selected according to the standards of the mechanical industry.

● the symmetry of the keyway to the axial line of the reference surface should not be out of tolerance, otherwise, it will cause assembly difficulty. The key - way of hot - press fitting part should meet the requirement of drawing. Otherwise in hot pressure assembly, due to the excess symmetry, the workpiece should not be installed in the position. And the hot press assembly of the pieces is difficult to remove after the assembly, often resulting in waste products.

● the distance between the two bearing gears should be accurate. Otherwise, problems such as axial deviation of rotor core or dead bearing after assembly will occur.

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Contact: Miss Ming

Phone: 13829101718

Tel: 0519-82325388

Email: sunyoujun@czxinyubao.com

Add: Hengtai RD NO.1, Jintan district, Changzhou city, Jiangsu province, China