Shaft sleeve refers to the sleeve on the transmission shaft or stern shaft. Bearing is a component that fixes and reduces the load friction coefficient in the process of mechanical transmission. The similarity between shaft sleeve and bearing is that they both bear the load of the shaft.
The difference between the two is that: the shaft sleeve is an integral structure, and relative movement occurs between the shaft and the shaft sleeve when rotating; The bearing is split, and the inner and outer rings of the bearing move relatively when rotating. But in essence, the shaft sleeve is actually a sliding bearing.
Extended data:
1. Machining Method and Precision of Cylindrical Surface
Shaft, sleeve and disc parts are typical cylindrical parts. The common machining methods of cylindrical surface are turning, grinding and various finishing methods. Turning is the most economical and effective machining method of cylindrical surface, but in terms of its economic accuracy, it is generally suitable for rough machining and semi-finish machining of cylindrical surface.
Grinding is the main finishing method of cylindrical surface, especially suitable for finishing all kinds of high hardness and quenched parts; Finishing is an ultra-precision machining method (such as rolling, polishing, grinding, etc. ) after finishing, it is suitable for some parts with high precision and surface quality requirements.
Because the economic machining accuracy, surface roughness, productivity and production cost that can be achieved by various machining methods are different, it is necessary to choose a reasonable machining method according to the specific situation in order to process qualified parts that meet the requirements on part drawings.
Second, the maintenance of the shaft sleeve
1, common failure causes
During the long-term operation of the shaft sleeve, the surface of the journal will be subjected to the extrusion force of the expansion sleeve and the resultant mechanical force, resulting in its permanent deformation, and its diameter may be reduced by 0.1mm ~ 0.3 mm. Further mechanical expansion fit strength can not reach the required contraction force, and there is a fit gap between the shaft sleeve and the main shaft, resulting in the wear of the shaft sleeve.
2, the latest repair method
Because of the high value of components, traditional maintenance methods are more expensive. With the development of advanced technologies such as polymer composites abroad, some repair methods with fast repair speed and low cost are favored.
This method has also been introduced in China, such as the relatively mature Fu 22 1 1F material. The material has comprehensive mechanical properties, excellent bonding force, temperature resistance and corrosion resistance, the maximum compressive strength can reach 1200kg/cm2, and the bonding force on smooth steel surface (overlapping shear tensile test) is 225kg/cm2.
Therefore, it can be used to repair the wear of large shaft sleeves. And a large amount of manpower and material resources are saved for enterprises.
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