Shaft Collars

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

1, concept

A Sprial Reducers sleeve made of a complete cylindrical protective shaft is called a Shaft Collar.
The bearing shell is equivalent to 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 group of robot components, the sleeves are specifically known as the silver-gray LEGO regular shaft holders, which are divided into full sleeves and 1/2 sleeves.
The main materials of all sorts of Shaft Collarss on the major 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 (referred to as “shafts” in Japan) are parts that fix and reduce the coefficient of friction of the strain during mechanical transmission.
The similarity between the 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 motion between your shaft and the sleeve is when rotating; and the bearing is definitely split, and the rotation may be the relative movement of the internal and outer rings of the bearing itself. However in essence, the Shaft Collars is actually a kind of sliding bearing.

3, common causes of damage

During the long-term procedure of the Shaft Collars, the surface of the journal is put through the pressing push of the growth sleeve and the composite mechanical drive, that will cause its permanent 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 drive, and a complementing gap occurs between your sleeve and the primary shaft, causing wear of the sleeve.

4, the latest repair method

Because of the large worth of components, the original repair strategies are relatively expensive. With the development of advanced systems such as polymer composite materials abroad, some repair strategies with quick fix and low cost are favored. This method has also been released in China, and the older Fushun Blue 2211F components. The material has the extensive mechanical properties, superb adhesion and temperature and corrosion level of resistance which can’t be compared with the traditional method. The utmost compressive power can reach 1200kg/cm2, and the adhesion (overlap shear tensile test) is certainly 225kg on the smooth steel surface area. /cm2. Consequently, it can be utilized for the repair of wear of large Shaft Collars parts. Furthermore, the equipment does not need to be disassembled in a sizable scale, which saves a whole lot of manpower and material resources for the business.

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