LIMIT SLIP DIFFERENNTIAL

Presented by:Rohit Dharap – (1115090)Sanket Kulkarni – (1115098)

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NEED FOR LIMITED SLIP DIFFERENTIAL

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Limited slip differentials use various mechanisms to allow normal differential action during turns, while also solving the problem of slippage.

When one powered tire slips, the LSD transfers more torque to the non-slipping wheel.

It provides better traction .

Basics of limit switch differential

The main advantage of a limited-slip differential is demonstrated by considering the case of an open differential in off-roading or snow situations where one wheel begins to slip or lose contact with the ground.

. In such a case with a standard differential, the slipping or non-contacting wheel will receive the majority of the power, while the contacting wheel will remain stationary with the ground.

The torque transmitted will be equal at both wheels, and therefore, will not exceed the threshold of torque needed to move the wheel with traction.

In this situation, a limited-slip differential prevents excessive power from being allocated to one wheel, and thereby keeping both wheels in powered rotation.

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PRINCIPLE OF OPERATION

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LSD mechanism applies a torque (internal to the differential) that resists the relative motion of the output shafts.

In simple terms, this means they have some mechanism which resists a speed difference between the outputs, by creating a resisting torque between either the two outputs, or the outputs and the differential housing. There are many mechanisms used to create this resisting torque.

Example-viscous and clutch-based LSDs. The amount of limiting torque provided by these mechanisms

varies by design

CONTD…….

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The torque delivered to the outputs is: Trq 1 = ½ Trq in + ½ Trq d for the slower output

Trq 2 = ½ Trq in – ½ Trq d for the faster output

When traveling in a straight line, where one wheel starts to slip (and spin faster than the wheel with traction), torque is reduced to the slipping wheel (Trq 2 ) and provided to the slower wheel (Trq 1 ).

In the case when the vehicle is turning and neither wheel is slipping, the inside wheel will be turning slower than the outside wheel. In this case the inside wheel will receive more torque than the outside wheel, which can result in understeer .

When both wheels are spinning at the same speed, the torque distribution to each wheel is:

Trq (1 or 2) = ½ Trq in ±(½ Trq d ) while

Trq 1 +Trq 2 =Trq in .

This means the maximum torque to either wheel is statically indeterminate but is in the range of ½ Trq in ±( ½ Trq d ).

Where Trq d=d =Difference in torque between right and left wheel

Trq1=slower wheel torque

Trq2=slipping wheel torque

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TYPES OF LIMIT DIFFERENTIALS

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1. VISCOUS TYPE 2. HELICAL TYPE3. TORQUE SENSITIVE TYPE4. CLUTCH TYPE5. 2-WAY,1-WAY,1.5 WAY6. ELECTRONIC

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CLUTCH TYPE LIMIT SWITCH DIFFERENTIAL

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TORQUE SENSITIVE LIMIT SWITCH DIFFERENTIAL

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Thank You