f sae transmission

8/12/2019 f Sae Transmission

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TRANSMISSION

- Abhishek Srivastava

- Amber Srivastava

- Dhebar Yashesh

- Kumar Saurav


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Purpose: Transfer rotation from

engine to wheels

PARTS of Tranmission System:1) Engine

2) Gearbox

3) Clutch4) Differential


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Engine Specifications:

Honda 600 CBR (proposed)

It comes with an inbuilt gear box and

clutch.

The engine gearbox consists of 6

gears (no reverse gear is there by

default).


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Drive Train:

Two types

1)Chain Drive

2)Shaft Drive

Reason- The car is a rear wheel drive

and the engine is also positioned at

the back of the chasis.

CHAIN 520 and 428 can be used


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Our transmission

In our car the output shaft from thegearbox is parallel to the axle of thewheels.

So we will be doing paralleltransmission which will use thesprocket chaindrive mechanism.

The final drive(gear-ratio of sprockets

attached to output shaft of gearboxand ring-gear of differential) ratio willbe around 4.


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CHAIN 520 OR 428??

520 chain is mainly used by teams but 428 can also be

used

Disadvantages of 428 chain:

1) Is not as durable as 520.

2) If we use 520 then well get a higher range of gear

ratio because of the sprocket that we can use in case of

520.

Chain Type Pitch Distance b/w inner plates

520 5/8

428 5/16

428 is lighter as compared to 520 and can workefficiently for


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Close-ratio and Wide-ratio

A close-ratio transmissionis a transmissioninwhich there is little difference between the gear

ratiosof the gears.

a transmission with large differences between

gears is termed "wide-ratio. These terms are relative.

A close-ratio is used for racing vehicles ( our case).
http://en.wikipedia.org/wiki/Transmission_(mechanics)http://en.wikipedia.org/wiki/Gear_ratiohttp://en.wikipedia.org/wiki/Gear_ratiohttp://en.wikipedia.org/wiki/Gear_ratiohttp://en.wikipedia.org/wiki/Gear_ratiohttp://en.wikipedia.org/wiki/Transmission_(mechanics)


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DIFFERENTIALSUsed to give different angular velocity to the right

and left wheel while turning.

Types:

1)Open differentials

2)Limited-slip differentials (LSD)

4)Quaife Differential

3)Torsen differentials


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Open DifferentialThe Basic

One http://www.youtube.com/watch?v=K4J

hruinbWc
http://www.youtube.com/watch?v=K4JhruinbWchttp://www.youtube.com/watch?v=K4JhruinbWchttp://www.youtube.com/watch?v=K4JhruinbWchttp://www.youtube.com/watch?v=K4JhruinbWc


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Limited Slip Differential:


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Torsen Differential:


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Differential of Our interest

We will be using Torsen differential.

Reason: Over normal open diff- in the

situation when the traction on both the

wheels is different the slipping willresult in the wheel with low traction in

case of open differential while the

torsen is specially made to sort outthis perticular situation.


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.

2) over LSD: in case of sharp or longturns (when the difference in velocity

of wheels is large or remains for a

long time resp.) differential will getlocked resulting in stopping the car.


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CLUTCH:

Use: 1) To bring a car to a stand-still

2) to help in changing gears

Composition of clutch: Flywheel,

Pressure Plates, Clutch Plates, ClutchCover,Diaphragm Springs

Flywheel-Connected to the engine

shaft.Clutch Plates-Connected to the layshaft

of the gear box


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Our system

Semiautomatic Transmission

(clutchless manual gearshift)

\

Kit to be used : we might be using

PROSHIFT PSU with Titanium Paddle

Shifters.


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FINAL level of

TRANSMISSION


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Transmission so far

We will implementing parallel transmissionfrom engine driveshaft to the wheels axel.

The differential to be used is that of

TORSEN.(considering the traction effect).

The two axels emerging out of thedifferential will be connected to wheels.


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Between differential axel and

Wheel The gearsinside differential operateswhen

there is proper balance of forces in them fromeither side.

One part of the differential axel is connectedto the wheels(indirectly) while the other isinserted in the gear chamber of differential.

If this axel is moved in the fashion otherthan its regular rotation, it will lead toimbalance in forces of gears in gear

chamber of diff which will stop the motionof gears..

So the constraint is that this axel performsonly the specified rotational motion.


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Between differential axel and

Wheel There are the 2 possibilities in which the

movement of axle can cause problem-

1)transversal(longitudenal movement)

2)rotational movement along some otheraxis.

2ndproblem will be solved with the help of U

joints.


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The U joint (Universal Joint)

Made for the purpose of transformingrotational motionof one axle(in our

case the differential one) to the

second one(connected to wheel)without concerning their mutual

angular inclination.

The clip.


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1stproblem

In total there will be 3 axel fromdifferential to wheel.

The centre one will be connected to

the axel going to the wheel via U-joint.This will solve our problem concerning

rotation about other axis.

Now remains the problem oflongitudinal displacement of diff. axle.


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The problem is solved using plunge joint.

Two rods connected using plunge joint have

the rotational constraint irrespective of the

distance between them. The better explanation is through this clip.

http://www.youtube.com/watch?v=o8iZpjPG

4xM

Cv joint-axel assembly
http://www.youtube.com/watch?v=o8iZpjPG4xMhttp://www.youtube.com/watch?v=o8iZpjPG4xMhttp://www.youtube.com/watch?v=o8iZpjPG4xMhttp://www.youtube.com/watch?v=o8iZpjPG4xM


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The final setup


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f sae transmission

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