Needle roller bearing checking and removing the rolling method

Blades with sleeve and bearing seat is fixed on both sides to cooperate. Commissioning occurs again free end bearing high temperature, the vibration value is on the high side of fault, disassemble the bearing on the cover, manual slow rotary fan, found in the axis of a particular position of bearing roller, in the load section are rolling. So can determine the needle roller bearing running clearance changes on the high side and installation clearance may be insufficient. Measured, timken bearing internal clearance is only 0. 4 mm, uranium eccentric reaches 0. 08mm； To avoid, because of the large bearing span around a shaft deflection or bearing installation Angle error is more difficult, therefore, a large fan USES can be adjusted automatically central spherical roller bearings. But when the bearing internal clearance is insufficient. Bearing internal rolling movement due to space restrictions, the function of the automatic ecg, vibration value will rise. Bearing internal clearance decreases with increasing with the tightness, unable to form the lubrication film, when the bearing running clearance due to temperature drop to zero, if the heat generated by the bearing running is still greater than the heat dissipation, bearing temperature will climb quickly, at this time, if not immediately stop, bearing will be burning, with tight of bearing inner ring and the shaft is in this case, bearing the cause of the abnormal high temperature operation. a) Inherent noise: race with all sorts of timken bearings and rolling friction ( Cylindrical roller bearing) Is inherent in the sound, rolling bearing raceway is by the elastic properties of the rolling element and raceway contact, when the needle roller bearing rotating roller rolling over on the rolling path of a continuous and a sophisticated sound; Abnormal sound of rolling friction can be issued a 'tickle, tickle' uncomfortable metal friction abnormal sound, smooth and good, won't make such a sound. So in normal condition is not a problem, as long as the noise increased after must pay attention to. b) Noise is related to the bearing manufacturing: here including aircraft noise and tremolo, adhere to the main attack aircraft noise in ball bearings and needle roller bearings, when bearing rotation due to adhere to the vibration of the frame and frame and roller impact makes a noise. The sound is cyclical. Tremolo ( All kinds of bearing) There is a certain frequency of sound, it is because of the raceway surface waviness of provoked vibration. This phenomenon is the most common problem, we later demand of can. In particular, we are learning some timken bearing knowledge of students, to seriously look at these key content, may have so some assistance to you. c) Using improper provoked noise: about various bearing all exist. When the rolling bearing raceway appearance or table in vitro was bruised, pit, rust, then you will have certain periodic noise and vibration. When bearing in operation will produce contamination noise have dust intrusion. This noise is cyclical, also with vibration, its sound size is not fixed, sometimes no. Processing, step down tight sleeve, readjust the matching of the shaft and the inner ring tightness, replace the bearing after the clearance from 0. 10mm。 To restart the installation fan, bearing vibration value and operating temperature back to normal. Bearing internal clearance is too small or poor parts design and manufacture of precision, are the extension of needle bearing operating temperature on the high side, for the convenience of the fan equipment installation; Repairing and maintenance. Commonly used more on the design of set set of bearing inner ring with tapered bore the bearing bearing, but also easily because of the negligence of the installation program problem. Especially the adjust of the appropriate clearance. Bearing internal clearance is too small. Operating temperature rise sharply: tapered bore the bearing inner ring is too loose and set fit, timken bearings for loose fitting surface occurs easily and failure loss in a short period.