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A large velocity ratio (8 : 1 or bigger) means that the difference between input speed and output speed is 8 or more times.
13.6 Types of sprockets
Figure 13.6 Types of sprockets
Driver sprocket Te driver sprocket is also known as the power sprocket. Tis sprocket is connected or keyed to the shaſt of the power source, normally an electric drive motor which drives the system. It is generally the smaller sprocket. Sometimes it is called the pinion.
Did you know?
Te driver sprocket is the one attached to the power source, e.g. motor output shaſt? An example is the front sprocket of a bicycle, the sprocket to which the connecting arm and pedals are attached.
Idler (Jockey) sprocket
As the name jockey indicates, it rides the chain and is always fitted on the slack side of the chain drive. Tis sprocket is a tensioning device whose main purpose it is to take up excessive slack in the chain drive. Remember, there must be a certain amount of slack