Question
Download Solution PDFWhich of the following types of pulley is used in-group drives?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Fast and loose pulley drive
- A fast and loose pulley drive is used when the driven or machine shaft is to be started or stopped whenever desired without interfering with the driving shaft.
- A pulley that is keyed to the machine shaft is called a fast pulley and runs at the same speed as that of the machine shaft.
- A loose pulley runs freely over the machine shaft and is incapable of transmitting any power.
- When the driven shaft is required to be stopped, the belt is pushed on to the loose pulley by means of a sliding bar having belt forks means this pulley is used in-group drives.
- This system has two pulleys mounted on the driven shaft and one pulley on the driving shaft.
Jockey pulley
- A jockey pulley is an idler pulley and is used to increase the angle of contact in an open belt drive.
- It is mounted near the smaller pulley of the two pulleys and placed on the slack side of the belt.
- It increases the angle of contact lead to the increased power transmission capacity of the drive.
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