Tapered sleeves


All "mechanical" friction joints consists of basically two sleeves which each has a tapered surface. In rare cases the tapered surface is divided with steps into several surfaces. This is to get a larger friction angle in order to make it easier to dismantle. In most cases the sleeves are partly or completely slotted to make them easier to deform and increase the surface pressure.


The sleeves are pressed against each other along the shaft. To do This, screws or a big nut are used. Because of the surface pressure between the two sleeves they deform into contact with the bore of the hub and the shaft.


The hydraulic principle


Consists of a double walled sleeve which encloses a pressure Medium, which is practically incompressible. The medium acts as a fluid at high pressure. This means according to "Pascals Principle" that the pressure is the same at every point in the fluid.


Through one or more screws or an external pressure source (pump) the pressure in the medium is increased. The double walled sleeve then deforms elastically and uniformly into contact with the bore of the hub and the shaft.


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