In order to improve the actual matching accuracy of crossed roller bearings during installation, it is necessary to use measuring tools that do not deform the bearing to carry out actual precision measurement of the matching surface dimensions of the inner hole and outer circle of the bearing. The relevant inner diameter and outer diameter can be measured, all the measurement items of the diameter are measured, and the measured data is analyzed, based on this, the size of the bearing installation part of the shaft and the seat hole is precisely matched.
The actual measurement of the corresponding size and geometry of the shaft and the seat hole should be carried out under the same temperature conditions as when measuring the bearing. In order to ensure a higher actual matching effect, the roughness of the matching surface of the shaft and the seat hole and the cross roller bearing should be as small as possible.
When making the above measurement, two sets of marks should be made on the outer circle and inner hole of the cross roller bearing, and on the corresponding surface of the shaft and the seat hole, on both sides close to the assembly chamfer, which can indicate the direction of the large deviation. , In order to align the large deviations of the two matching parties to the same orientation during actual assembly, so that the deviations of the two parties can be partially offset after assembly. The purpose of making two sets of orientation marks is that the compensation of deviation can be considered comprehensively, not only to improve the respective rotation accuracy of the bearings at both ends but also to partially eliminate the coaxiality error of the seat hole between the bearings and the journals at both ends. The implementation of surface strengthening measures on the mating surface, such as sandblasting, using a precision plunger with a slightly larger diameter to plug the primary inner hole, etc., are all conducive to improving the accuracy of the mating.
For large bearings with large outer ring interference, in order to facilitate installation, the outer circle of the outer ring and the bearing seat hole are also made with a small taper. The amount of advancement of the ring keeps its interference within a predetermined range, and the frictional resistance of the end cap end facing the end surface of the outer ring also helps to fix the outer ring and prevent it from creeping. This installation method is particularly convenient for vertically mounted bearings.
According to the load direction and nature of the cross-roller bearing and which of the inner and outer rings rotates, the load on each ring can be divided into the rotating load, static load, or non-directional load. The ferrule bearing the rotating load and the non-directional load should adopt static fit (interference fit), and the ferrule bearing static load may adopt transition fit or dynamic fit (clearance fit). When the bearing is heavily loaded or subjected to vibration or shock load, its interference must be increased. When using hollow shafts, thin-walled bearing boxes or light alloy or plastic bearing boxes, the amount of interference must also be increased. When it is required to maintain high rotation, high-precision bearings must be used, and the dimensional accuracy of the shaft and the bearing box must be improved to avoid excessive interference. If the interference is too large, the geometrical accuracy of the shaft or the bearing housing may affect the geometrical shape of the bearing ring, thereby impairing the rotation accuracy of the bearing.
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