N2 Fitting and Machining Theory|Hands-On! 51 Taper bearing


Tis is a specialised type of bearing used mostly on special machinery like a centre lathe under clean, controlled conditions only. Taper bearings are designed to carry extremely high radial and thrust forces simultaneously.


It requires a little more skill to set up this type of bearing as the taper on the shaſt has to be exactly the same as the one on the shaſt to which it is to be fitted. Tere is no room for error.


Figure 4.4 Taper bearing


Te degree of taper varies to suit the maximum amount of thrust that the bearing will have to carry. Te spindle of a lathe has to carry a unique combination of forces both axial and radial, especially when a cut is being taken; chatter and vibration also come into the equation.


Te lubrication of bearings is also unique. A ring of slightly larger diameter than the shaſt on which it is running is fitted into a groove in the centre of the bearing. Te top part of the ring runs on the shaſt itself while the lower part of the rotating ring is submerged in an oil bath where it picks up oil as it rotates, deposits it on the shaſt inside the bearing, thus supplying a continuous flow of oil to the bearing and shaſt.


Hanger bearing


Hanger bearings are similar to plumber block bearings in appearance but their height is adjustable and they are mostly under slung. Tey are mounted under, not on top of frames or housings.


There is a wide variety of options of shape, size and applications, available to the customer. Tis type of bearing has many forces acting downwards on it due to the force of gravity. Simple hanger bearings can be fitted with split or solid, sliding bearing halves, solid bushes or pre-packed ball or roller bearings.


Single- and multi-collar thrust bearings


Most shaſts that transmit power via gears whether they be with helical, conical, spiral worm, or hypoid gears, will generate end thrust. To prevent sideways movement, thrust bearings or collars have to be used.


Figure 4.6(a) A single-collar bearing


Figure 4.5 Hanger-type bearing


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