How is power transmission achieved in positive contact clutches?

Question

Question

This question was previously asked in

ALP CBT 2 Fitter Previous Paper: Held on 23 Jan 2019 Shift 1

Answer 1

Explanation:

Clutch:

Clutch is a mechanical device used to connect or disconnect the power source from the rest of the of power transmission at the will of the operator.

Types of clutches:

there are mainly two types of clutches

1. Positive clutches:

The Positive clutches are used when a positive drive is required.
the simplest type of positive clutch is a Jaw or claw clutch.
The Jaw clutch permits one shaft to drive another through direct contact of interlocking jaws.
Due to interlocking, power is transmitted from one shaft to another shaft and by shear action.
It consists of two halves, one of which is permanently fastened to a driving shaft by a sunk key.
the other half is movable and it is free to slide axially on the driven shaft, but it is prevented from turning relatively to its shaft by means of a feather key.

2. Friction Clutches:

Friction clutch uses frictional force to start the driven shaft from rest and gradually up to proper speed without slipping of the friction surfaces.
A friction clutch has its principal application in the transmission of the power of shafts and machines which must be started and stopped frequently.
Its application is also found in cases in which power is to be delivered to machines partially or fully loaded.