Installation of bearing adapter sleeve and determination of adapter sleeve life.

The tightening sleeve is a commonly used component for positioning bearings with tapered holes on cylindrical shafts, as this sleeve can be used for optical or stepped shafts. The tightening sleeve is used to fix the tapered hole self-aligning bearing on a shoulderless shaft, with a relatively simple structure and easy replacement. It is widely used in industries such as textile, light industry, papermaking, metallurgy, belt transportation, and conveying equipment. Let's learn more about the installation method of the bearing adapter sleeve.

Installation of bearing adapter sleeve.

The shaft sleeve is easy to install and does not require additional fixation on the shaft. When using a locking sleeve on the optical shaft, the bearing can be positioned anywhere on the shaft. When using the same stepped ring on a stepped shaft, the bearing can be axially positioned, which also facilitates the unloading of the bearing. When installing the locking sleeve, the lock nut locks the bearing onto the sleeve, and a spacer ring must be inserted between the shaft shoulder and the inner ring at the other end. If it is an optical shaft (without shaft, it cannot be used according to the contact surface), the axial bearing capacity of the bearing is determined by the friction between the shaft and the cone sleeve.

Determination of the service life of the fastening sleeve.

The radial runout of the outer cone of the fastening bushing facing the inner hole (commonly referred to as the wall thickness difference KD0) should be highly accurate, otherwise the rotating shaft will generate centrifugal force due to the eccentricity, and cannot operate smoothly, resulting in large vibration and noise. A wall thickness difference of 0 is an ideal state. According to the national standard, the dimension segment of KD0 large bearing with an inner diameter less than 65 is about 1/2 of the large clearance of the standard group of bearings, which is equivalent to the larger clearance value of C2 level. Therefore, fasteners conforming to the national standard cannot be used for matching precision level heavy load bearings.

The taper angle difference of the fastening sleeve must be better. The national standard is expressed as △ D1mp - △ d3mp, and the allowable deviation for different size segments is+0.018-0.09. The upper deviation requires that the taper angle difference of the fastening sleeve should only be large and not small, that is, the large end needs to be matched and contacted. The small tapered end can have a little clearance, and the tapered hole does not fit well. Matching self-aligning roller bearings can cause a single row of rollers to be stressed, unstable in operation, high in vibration, loud in noise, easy to loosen, and short in bearing life. The cone angle difference of high-precision locking sleeves should be ≤ 005, ensuring that the matching contact area is not less than 90%.

3. The linearity of the outer cone surface and inner hole surface of the fastening sleeve is good, the geometric tolerance is good, and the cylindricity accuracy is good. The national standard does not stipulate that any single sectional dimension is acceptable within the allowable range. The control of the linearity of the outer cone surface is not strict, especially when grinding the outer cone surface, the workpiece itself has poor linearity, the grinding wheel correction is poor, and the surface linearity is poor. Generally, enterprises do not have a profiler to check, and there are problems with the product in the fastening sleeve industry in China, It seriously affects the matching accuracy and stability, as well as poor bearing performance.

4. Thread tightening performance of the set sleeve. The supporting bearing is fixed on the rotating shaft by compressing the end face of the bearing inner sleeve by rotating the locking nut axially to tighten the taper between the fastening sleeve and the bearing inner hole. Therefore, the thread fit between the bearing nut and the fastening sleeve must be good and meet the national standard requirements for ordinary threads.

The above content is the knowledge introduced by friends about the installation of bearing adapter sleeves and the determination of their service life. For a precision product such as a set sleeve, its technical conditions must meet national standards in order to be considered a high-precision product. Only high-precision locking sleeve and withdrawal sleeve products can maximize the performance of bearings.