Shaft Collars
The Shaft Collars is a cylindrical mechanical part that’s placed on the rotating shaft and can be an integral part of the sliding bearing.
Generally, the Shaft Collars and the bearing housing have an interference in shape and a clearance match the shaft.

1, Oil-free Air Compressors concept

A sleeve made of a complete cylindrical protective shaft is called a Shaft Collar.
The bearing shell is the same as the external ring of the sliding bearing, the sleeve is integral and the contrary shaft is moving, as the bearing shell is segmented and the opposite shaft is rotating.
In the LEGOMindstorms series and BioTransRoSys series of robot components, the sleeves are specifically referred to as the silver-gray LEGO regular shaft holders, which are split into full sleeves and 1/2 sleeves.
The main materials of all sorts of Shaft Collarss on the main hydropower generating units are ZQAl9-4, ZQSn10-1 and ZQSn6-6-3.

2, the difference

A Shaft Collars is a sleeve on a propeller shaft or a yoke shaft. Bearings (known as “shafts” in Japan) are parts that fix and reduce the coefficient of friction of the load during mechanical transmission.
The similarity between the Shaft Collars and the bearing is that both bear the strain of the shaft.
The difference between the two is that the sleeve is of integral structure, and the relative motion between your shaft and the sleeve is when rotating; and the bearing is usually split, and the rotation is the relative motion of the inner and outer rings of the bearing itself. However in essence, the Shaft Collars is truly a kind of sliding bearing.

3, common causes of damage

During the long-term procedure of the Shaft Collars, the top of journal is put through the pressing power of the growth sleeve and the composite mechanical push, that will cause its long term deformation, and the size may be reduced by 0.1mm~0.3mm. Because of this, the mechanical expansion and the strength of the force are not up to the mandatory tightening pressure, and a complementing gap occurs between the sleeve and the primary shaft, causing use of the sleeve.

4, the most recent repair method

Because of the large value of components, the original repair strategies are relatively expensive. With the advancement of advanced technology such as polymer composite materials abroad, some repair strategies with quick fix and low priced are favored. This technique has also been introduced in China, and the more mature Fushun Blue 2211F components. The material gets the comprehensive mechanical properties, superb adhesion and temp and corrosion level of resistance which cannot be compared with the traditional method. The utmost compressive power can reach 1200kg/cm2, and the adhesion (overlap shear tensile test) is definitely 225kg on the smooth steel surface area. /cm2. Consequently, it can be utilized for the restoration of wear of huge Shaft Collars parts. Moreover, the equipment doesn’t need to end up being disassembled in a huge scale, which saves a whole lot of manpower and materials resources for the enterprise.