Cheap small electric motors are sold. The commonly used rolling bearing models for motors are deep groove ball bearings, cylindrical roller bearings, spherical roller bearings, and angular contact ball bearings. Small motors use deep groove ball bearings at both ends, medium-sized motors use roller bearings at the load end (usually used for high-load conditions), and ball bearings at the non-load end (but there are also the opposite). Small motors also use angular contact ball bearings. Spherical roller bearings are mainly used for large motors or vertical motors. Motor bearings require no abnormal noise, low vibration, low noise and low temperature rise. Bearing selection method:
According to the bearing load: ①Small or medium load should give priority to ball bearings (because the main components of ball bearings are in point contact); ②Roller bearings should be selected for larger loads (which can bear larger loads and shocks) Load, small deformation after load).
Select the bearing type according to the direction of the load: ① only bear axial load, use angular contact bearings (single-directional thrust ball bearings); ② only bear radial load, use single row radial ball bearings (deep groove ball bearings) or tapered rollers Bearings; ③When bearing radial and axial alternating loads, use tapered roller bearings, angular contact bearings and deep groove ball bearings.
Axial fixation of rolling bearings (fixed inner ring method): one end of the inner ring of the bearing is usually positioned by a shoulder or sleeve. ①The shaft is fixed with an elastic retaining ring, which is mainly used for occasions with low speed and small axial load; Retaining ring fixing: can be used for higher speed and larger axial load, and only applicable to the shaft end; ③fixed with round nut and brake washer, mainly used for the occasions with higher speed and large axial load; ④tightening The bushing and the round nut are structurally fixed, and are used to fasten the self-aligning bearing on the long shaft with little axial force and speed.
