A Number of gears is placed on the one shaft which is at fixed distance from the output shaft. The transmission takes placed over another gear which can be swung backand forth for proper meshing with the driving and driven gears. The system is usually used for feed drives and also known as Norton gear box. Sliding Types Cluster Gears: A set of cluster gears where two or three gears is moved along a shaft to engage another set of gears where one gear of the cluster is engaged at a time. An advantageous application of positive clutches is the back gear arrangement . Both the driving and the driven shafts are placed co-axially so that either they coupled directly ot indirectly over a number of intermediate gears. Friction Clutches: Friction Clutches permits rapid and smooth speed changing without stopping the machine and the use of helical and herringbone gears in a gearbox. The limiting torque capacity, high friction loss and comparatively large a...
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