Shaft Collars

Shaft Collars
The Shaft Collars is a cylindrical mechanical part that’s positioned on the rotating shaft and is an integral part of the sliding bearing.
In general, the Shaft Collars and the bearing housing have an interference in shape and a clearance match 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 opposite 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 particularly known as the silver-gray LEGO standard shaft holders, which are split 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 elements that fix and reduce 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 your two is that the sleeve is of integral structure, and the relative movement between the shaft and the sleeve is when rotating; and the bearing is definitely split, and the rotation is the relative motion of the inner and outer bands of the bearing itself. However in essence, the Shaft Collars is actually a sort of sliding bearing.

3, common causes of damage

During the long-term operation of the Shaft Collars, the top of journal is subjected to the pressing power of the expansion sleeve and the Agricultural Gear Reducer composite mechanical drive, that may cause its long term deformation, and the diameter could be reduced by 0.1mm~0.3mm. Because of this, the mechanical growth and the effectiveness of the force are not up to the required tightening push, and a coordinating gap occurs between your sleeve and the primary shaft, causing wear of the sleeve.

4, the latest repair method

Because of the large value of components, the traditional repair methods are relatively expensive. With the development of advanced systems such as polymer composite materials overseas, some repair methods 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 has the extensive mechanical properties, superb adhesion and heat 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 check) is definitely 225kg on the smooth steel surface area. /cm2. Consequently, it can be utilized for the repair of wear of huge Shaft Collars parts. Moreover, the equipment does not need to become disassembled in a huge scale, which saves a whole lot of manpower and materials resources for the business.