What is Clutch ? (Power transmission by clutches, Types of tooth Clutch, Types of Clutches)- ITI ONLINE NOTE
What is Clutch
1- Clutch is a mechanical device and type of clutch used for engage and disengage power transmission from driving shaft to driven shaft.
2- Clutch is use where positive drive (torque transmit without slip) is required.
3- Clutch is a mechanical device and type of clutch used for engage and disengage power transmission from driving shaft to driven shaft.
4- Positive clutch is use where positive drive (torque transmit without slip) is required.
5- In positive clutch two machine elements are used, one element is rigidly fixed to driving shaft.
6- And other machine element is free to slide axially on splined driven shaft and it helps for engage or disengage clutch.
7- Machine elements of positive drive have jaws which help to connect shaft (driving shaft and driven shaft).
8- Jaws may be in square shape, triangular shape or gear toothed.
9- According to use different type of jaw machine element is used in clutch.
Application of positive clutch
1- They have very limited use.
2- However, they have some application where the synchronous drive is required. Advantages
3- They do not slip.
2- They can transmit large torque.
Disadvantages
1- Engagement of clutch cannot be possible at high speed.
2- Develop do not heat during engagement and disengagement because of rigid interlocking (no friction).
Power transmission by clutches
1- The purpose of the clutch is to connect or disconnect the various mechanisms to the power source.
2- Various types of clutches are incorporated in machine tools.
Types of tooth Clutch
Straight tooth clutch
1- The straight tooth clutch permits rotation either direction.
2- This type is more difficult to engage, since the mating teeth and grooves must be in perfect alignment before engagement.
Inclined tooth clutch
1- The inclined tooth clutch provides an easier means of engaging or disengaging the driving and driven members because of an 8 or 9 degree angle machined on the faces of teeth.
2- Since this type of clutch tends to disengage more rapidly, it must be provided with a positive means of locking it in engagement.
3- Clutches of this type permit the shafts to run in either direction without backlash.
Saw tooth clutch
1- It permits drive in only one direction but is more easily engaged than the other two types of clutches.
2- The angle of the teeth in this type is generally 60 degree.
Types of Clutches
Dog clutch
1- The dog clutch provides a positive drive but can only be engaged when two elements of the clutch are stationary or are being gently mood by hand.
Cone clutch
1- The cone clutch can be engaged progressive whilst one or both of the elements are rotating.
2- It can transmit low power
Multi-plate clutch
1- The multi-plate clutch is widely used in machine tools to connect the transmission gearbox to the driving motor.
2- It is compact, smooth in operation and very powerful.
3- A brake is frequently built into the clutch so that the transmission gearbox is rapidly brought to rest when the clutch is disengaged.
Electromagnetic multiple disc clutch
1- This clutch joins the shaft and the gear.
2- It can be operated through a cable from a distance.
3- If direct current is applied, it builds a magnetic field on a magnetic coil.
4- It flows through the discs and firmly pulls and attracts the armature disc.
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