NSK bearings and shaft with the testing

NSK bearings and shaft fit clearance must be appropriate, NSK bearings to make the service life is longer, the NSK bearing radial clearance test can adopt the following methods: one, the ruler test NSK bearings for larger diameter, clearance is bigger, he found a narrow feeler direct detection. NSK bearings for small diameter, clearance is small, convenient to use feeler, but NSK bearing clearance, must use the thickness of the appropriate feeler. Second, the pressure test lead with NSK bearing clearance method to detect pressure lead than using feeler detection more accurate, but more troublesome. Detection of aluminium wire should be used in the soft, medium diameter, shoulds not be too big or too small, the ideal clearance diameter 1. 5 ~ 2 times, the actual work showed soft lead wire for testing. Detection, NSK bearing cover opens first, choose the right diameter of lead wire, to cut it into 15 ~ 40 mm long segments, NSK bearings on the shaft neck and upper and lower boundary surface, NSK bearing cover to cover, tighten the retaining bolt torque by the regulation, and then screw bolt, NSK bearing cover and remove the detected using micrometer flattening of the thickness of the galvanized iron wire, NSK bearings and the average of the tip clearance. If the top gap is too small, can add pad on the surface of the upper and lower tile combination. If too large, the reduction of pad, scraping the inquiry or watering the tile again. Adjustment of bearing force: in order to prevent the bearing shell may occur in the process of job rotation and axial movement, besides the fit interference and stop parts, bearing bush also required to compress with NSK bearing cover, tip clearance measurement method and test method, to measure the thickness of the soft lead wire, can be used to calculate the bearing force. General bearing pressure force at 0. 02 ~ 0. 4 mm. If the compression force do not conform to the standard, the NSK bearing and the bearing seat available increase or decrease in joint surface of the gasket thickness method to adjust, tile back no padded. Sliding bearing in addition to to ensure the radial clearance, should also guarantee the axial clearance. Detection of axial clearance, remove the shaft to an extreme position, and then with a feeler gauge or dial indicator measure shaft position from one extreme to another extreme position of channeling momentum namely axial clearance. When the clearance is not in conformity with the provisions of the sliding bearing, should be adjusted. NSK bearings for open often use gasket radial clearance adjustment.