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Inspection of rolling bearings for automobiles

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Rolling bearings on automobiles include ball bearings, roller bearings, tapered bearings and needle roller bearings. They often work under high speed and heavy load conditions and bear considerable alternating loads. Therefore, rollers and raceways often produce serious wear, fatigue spalling, fracture, ablation (that is, high temperature annealing, serious, the color is purple black, similar to blue) and other phenomena. When rolling bearing, a component usually does not need to decompose and check the damage condition of each part. When inspecting, the bearings are cleaned and rubbed. The quality of the bearings can be appraised by means of external inspection, idling test and internal clearance inspection if necessary.

(1) appearance check. In the inspection, if the following damage phenomena are found, they should be replaced in time.

Rollers (ball, cylindrical roller, tapered roller, needle) and internal and external raceways are discolored by ablation; in the internal and external raceways of bearings, there are impact marks, marks and scratches; in the internal and external raceways of bearings, rolling bodies (ball, cylindrical roller, tapered roller, needle) on the occurrence of cracks, metal delamination, scaly peeling and a large number of (ball, cylindrical roller, tapered roller, needle) Usually more than one third of the area) black spots; excessive wear in the groove of the retaining roller, the roller can fall out by itself; due to tapered roller wear, its small end of the working face protruding out of the bearing outer seat ring end; tapered roller bearing inner ring large end of the internal end of the notch and metal spalling. In the inspection of rolling bearings, if only minor corrosive black spots are found in the bearings and minor defects in the cage are found, without affecting the rotation of the bearings, they can generally continue to be used.

(2) idling inspection. The experiment mainly depends on whether the bearing rotates flexibly, whether there is noise or whether it is stuck or not. The inhomogeneity of the bearing rotation can be judged from the feeling on the hand (the old bearing is allowed to have a slight noise).

(3) internal clearance check. The measurement of internal clearance and wear of ball bearings can be judged by measuring their radial and axial clearance.

Axial clearance inspection: the bearing outer seat ring is placed on two cushion blocks, and the inner seat ring is suspended, and then a small plate is placed on the inner seat diagram, the dial stylus against the center of the plate, the maximum allowable value of axial clearance is 0.20 ~ 0.25 mm.

Radial clearance inspection: Place the bearing on a flat plate so that the dial gauge stylus against the bearing outer seat, and then hand press the bearing inner ring, the other hand reciprocating push the bearing outer ring, the number of meter needle swing is the radial clearance of the bearing. The maximum allowable value of radial clearance is 0.10~0.15mm.

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