1. The taper angle difference of the adapter sleeve must be good. The national standard is represented by △D1mp-△d3mp. The tolerance of different size segments is from +0.018 to 0.09. The upward deviation requires that the taper angle difference of the adapter sleeve can only be large but not small, that is, the big end It is necessary to cooperate with the contact, the small end of the taper can have a little clearance, the taper hole is not well matched, and the matching spherical roller bearing will form a single-row roller bearing force, the operation is unstable, the vibration is large, the noise is loud, and the bearing is easy to loosen. The service life is short, and the taper angle difference of the high-precision adapter sleeve should also be ≤0.005 to ensure that the mating contact area is not less than 90%.
2. The radial runout of the outer cone of the fastening bushing facing the inner hole (that is, the wall thickness difference) should be high-precision, otherwise the rotating shaft will generate centripetal force due to the equal amount, and it will not be able to run bumpy, the vibration is large, the sound is loud, and the wall A thickness difference of "0" is an ideal shape. The maximum size of the bearing inner diameter below 65 according to the national standard is about 1/2 of the maximum clearance of the bearing standard group, which is very similar to the maximum clearance value of the C-level accuracy. Therefore, the adapter sleeve products qualified by the national standard are used in the fine-level large load. The bearing matching is not acceptable.
3. The outer tapered surface of the adapter sleeve and the outer surface of the inner hole have better linearity, that is, the shape and position tolerances are better, and the cylindricity accuracy is better. There is no rule in the national standard. Any single section size within the tolerance field is qualified, and this is the formation of The straightness of the outer surface of the outer cone is not strictly controlled, especially when the outer cone is cut into grinding, the straightness of the blank itself is not good, the grinding wheel correction is not good, the linearity of the appearance is very poor, and there is no profiler inspection in ordinary enterprises, so this The project has great problems in the products of my country's adapter sleeve industry, which seriously affects the matching accuracy and stability of the matching, and also causes the bearing to perform poorly.
4. The thread locking function of the adapter sleeve supports the bearing by rotating the lock nut axially to squeeze the end face of the inner sleeve of the bearing to tighten the inner taper of the adapter sleeve and the inner hole of the bearing to achieve the purpose of fixing the bearing on the rotating shaft. Therefore, the thread matching between the bearing nut and the adapter bushing must be good, and it must meet the national standard requirements of ordinary threads.
