The difference between the adapter sleeve and the withdrawal sleeve

The adapter sleeve is tightened to the round nut to tighten the bearing, and the withdrawal sleeve is reversed. The specific implementation method is that the thread is opened differently: the adapter sleeve is in the thin part, and the withdrawal sleeve is in the thick part.

The taper design of the bearing ring is designed for the convenience of installation and disassembly, improving efficiency and reducing the maintenance cost of the machine. In layman's terms, the adapter sleeve is used for easy installation, and the withdrawal sleeve is used for easy disassembly. Simply understood, the adapter sleeve is an accessory for the inner tapered bore bearing, which ensures the stable operation of the matching bearing. The use of the withdrawal sleeve and the adapter sleeve can achieve the effect of adjusting the internal clearance.

(1) Bearing sleeves are widely used in places where light loads are easy to disassemble. There are many bearings that encounter difficulties in assembly and disassembly, especially in the assembly of bearings inside the cabinet. The application of the bearing sleeve solves the assembly and disassembly problems.

(2) Because the bearing sleeve can be adjusted tightly, the machining precision of many cabinets is relaxed, and the work efficiency of the box processing is greatly improved.

(3) The axial sway of the bearing is overcome by the friction between the shaft and the inner ring according to the sleeve.

Therefore, the bearing sleeve is widely used, but there are also some shortcomings, because the accuracy of the sleeve directly affects the radial runout of the shaft.

Key technology of bushing

1. The set angle difference of the set sleeve must be good. The national standard is indicated by △D1mp-△d3mp. The tolerance of different size ranges from +0.018-0.09 is the upper bias. The tightening angle of the set sleeve can only be large but not small, that is, big end. It is necessary to cooperate with the contact, the small end of the cone can be a little gap, the cone hole is not well matched, and the matched spherical roller bearing will form a single row of roller force, the operation is not stable, the vibration is large, the music is loud, easy to loose, the bearing The life span is short, and the taper angle difference of the high-precision adapter sleeve should also be ≤0.005, ensuring that the mating contact area is not less than 90%.

2. The radial runout of the outer cone of the bushing facing the inner hole (that is, the wall thickness difference usually called) should be high-precision. Otherwise, the rotating shaft will have a centripetal force due to the fairness, and it cannot be jolted, the vibration is large, the music is loud, and the wall A thickness difference of "0" is an ideal form. The maximum value of the national standard rule is less than 1/2 of the maximum clearance of the bearing specification group, and the maximum clearance value of the C-class precision is very large. Therefore, the national standard qualified adapter product is used in the fine-level heavy load. The bearing package is not acceptable.

3. The straightness of the outer taper surface and the inner hole of the tightening sleeve is better, that is, the geometrical tolerance is better, and the cylindricity accuracy is better. This national standard has no rule. Any single cross-sectional dimension is qualified in the tolerance field, so that is formed. The outer cone surface has poor linearity control, especially the outer tapered surface is ground and grinded. The blank itself is not linear, the grinding wheel is not well corrected, the linearity of the outer surface is very poor, and the ordinary enterprise has no profile test, so this The project has a great problem in the products of the tightening industry in China, which seriously affects the matching accuracy and the supporting stability, and the bearing function is not good.

4. The threaded locking function of the adapter sleeve is driven by the rotation of the lock nut. The end face of the inner sleeve of the compression bearing is tightened so that the adapter sleeve and the inner bore of the bearing are tapered, and the bearing is fixed on the rotating shaft. Therefore, the threaded fit of the bearing nut and the tightening bushing must be good, and it must meet the national standard requirements of ordinary threads.

It is quicker to install and disassemble, and it is easier to install and disassemble bearings on some paper machines by using SKF bushings. The adapter sleeve enables the bearing to be mounted on a smooth shaft and a stepped shaft. Installation is made easier and there is no need to fix it with other devices. This also avoids the high cost of shaft machining. It is also possible to use a withdrawal sleeve in the case of mounting a bearing on a stepped shaft. All of SKF's premium bushings contribute to optimum performance and long life.

Practical application

Application: packaging machinery, textile machinery, mining machinery, metallurgical machinery, printing machinery, tobacco machinery, forging machinery, all kinds of machine tools and interchangeable machinery transmission coupling. For example: pulleys, sprockets, gears, propellers, large fans and other various connections; features: large torque, high precision, easy to assemble and disassemble, simple operation, good positioning, reduce the scrap rate of the shaft and hub to be fitted, Reusable and undamaged, it is the most ideal and economical choice.

1. Installation: The expansion sleeve has been coated with lubricating oil at the factory and can be directly installed and used. When installing, first screw three bolts into the screw holes of the flange of the other part and spread them evenly around the circumference to open the inner sleeve and the outer sleeve. Then place the expansion sleeve into the hub hole of the design position and tighten the bolt with the force gauge. The tightening method is that each bolt is only screwed to 1/4 of the rated torque at a time, and the order of tightening is bounded by the slit. The left and right cross symmetry is tightened one after the other to ensure that the rated torque value is reached.

2. Disassembly: Loosen all bolts a few times before disassembly. Then screw in the bolt top expansion sleeve in the disassembled screw hole.

3. Protection: Prevent expansion of the sleeve during installation. In machines with open air or poor working environment, anti-rust grease should be applied regularly on the exposed end face and bolts of the expansion sleeve. The expansion type with better rust resistance should be selected. The expansion joint sleeve is a new type of advanced mechanical basic parts. It is a new type of keyless coupling device widely used in the world to realize the transmission of load and friction by tightening the 12.9 high-strength screw to achieve the load transmission.