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Shaft Collars
The Shaft Collars is a cylindrical mechanical part that is placed on the rotating shaft and is an integral area of the sliding bearing.
In general, the Shaft Collars and the bearing casing have an interference in shape and a clearance fit with the shaft.

1, concept

A sleeve made of a complete cylindrical protective shaft is called a Shaft Collar.
The bearing shell is the same as the outer ring of the sliding bearing, the sleeve is integral and the contrary shaft is moving, while 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 divided into full sleeves and 1/2 sleeves.
The primary materials of all sorts of Shaft Collarss on the main hydropower producing 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 decrease the coefficient of friction of the strain during mechanical transmission.
The similarity between your Shaft Collars and the bearing is that both bear the load 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 may be the relative motion of the internal and outer bands of the bearing itself. But in essence, the Shaft Collars is truly a sort of sliding bearing.

3, common factors behind damage

During the long-term procedure of the Shaft Collars, the surface of the journal is subjected to the pressing pressure of the growth sleeve and the composite mechanical force, which will cause its long term deformation, and the size could be reduced by 0.1mm~0.3mm. Consequently, the mechanical growth and the strength of the force are not up to the mandatory tightening pressure, and a coordinating gap occurs between your sleeve and the main shaft, causing put on of the sleeve.

4, the most Speed reducer recent repair method

Because of the large value of components, the original repair methods are relatively expensive. With the development of advanced systems such as for example polymer composite materials abroad, some repair strategies with quick fix and low priced are favored. This method has also been launched in China, and the older Fushun Blue 2211F materials. The material gets the comprehensive mechanical properties, exceptional adhesion and temp and corrosion level of resistance which can’t be compared with the original 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. As a result, it can be utilized for the repair of wear of large Shaft Collars parts. Moreover, the equipment doesn’t need to end up being disassembled in a huge level, which saves a lot of manpower and material resources for the enterprise.