Tuesday, February 15, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

CrazyEngineers Forum - Mechanical & Civil Engineering

Joints

Posted: 15 Feb 2011 08:22 AM PST

As we all know joints form an important component of an automobile.Joints are needed to hold parts together,to transmit power and various reasons as we all aware.
So directly coming to point,let us now discuss various types of joints.

But before discussing joints let us talk about:
Drive Lines:
A drive line is actually an assembly of various joints like universal joints,slip joints and drive shafts.A propeller shaft is a simple example if I am not wrong.
Vehicles with front wheel drive usually have trans-axle assembly mounted transversely.Also short drive shafts extend from trans-axle to front wheels.

Universal joints:
Whenever two shafts are inclined at an angle we can easily transmit power from one shaft to another by using a Universal joint.(For reference see an image of Cardan universal joint).
In this joint to Y shaped objects called yoke are connected to each other with the help of a cross shaped part also called as 'spider'.The driving and yoke force the spider to rotate.When two shafts are at an angle with each other,the needle bearings permits the yokes to swing around the trunnions with each revolution.
Eg: Spider and two yoke universal joint.

Slip Joints:
A slip joint has splines on its outer part and matching internal splines in a mating hollow Yoke.When this assembly is assembled these splines cause the shaft to rotate together while they can move back and forth.Hence the length of drive shaft changes.

CV joints
Actually the full form of this joint is constant velocity universal joint.A common example of CV joint is double cardan joint.It is nothing but two universal joints put together.They are linked by ball and socket joint which splits the angle between two shafts.This causes both the shaft to rotate at same speed.
The various other types of CV joints are:
1.Outer CV joints
2.Inner CV joints
3.Double-Offset CV joints
4.Plunging-Tripod CV joints

Can any one add value to this article?
Waiting for your replies...

seminar topic on fluid machinary and thermal engg

Posted: 15 Feb 2011 07:04 AM PST

am willing to present a paper on latest innovation on the above topic ..its a national level conference please suggest some topics:rolleyes:

Clutches

Posted: 15 Feb 2011 06:45 AM PST

Hi friends,
Let us now discuss something about clutches.

Construction of clutches:
A typical clutch consists of three basic parts.They are:
1.Fly wheel
2.Friction disc
3.Pressure plate
Fly wheel drives the pressure plate.They attach to and rotate with engine crank shaft.The friction disc diameter is about 30cm or less and splined to the clutch shaft or transmission input shaft.Both must turn together but the friction disc must slide back and forth on shaft's splines.
The pressure plate with one or more springs attaches to the clutch cover.The fly wheel is bolted with pressure plate and rotate together.
When the clutch is engaged ,Spring holds the friction disc against the fly wheel.The engine crank shaft and transmission input shaft has the same centrelline.The small end of input shaft rides in a pilot bearing or bushing in the end of crankshaft.The transmission input shaft bearing supports the other end of input shaft.

Uses and functions of clutch
1.Clutch can disengage the gear and engine.Thus engine can run idle without power being transmitted to gear.(However it wastes fuel,that is why we are advised to use minimum clutch and drive with a constant speed)
2.Allows the driver shaft to transfer into proper gear when clutch is disengaged.
3.While engaging,the clutch slips momentarily.This provides smooth smooth engagement of various gears and gear trains.
4.It transmits power from Engine to gear when engaged.

So what say everyone?:mrgreen:
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