syed anis badshah(uw-09-me-001) project presentation

7/31/2019 Syed Anis Badshah(Uw-09-Me-001) Project Presentation

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1)- Syed Anis BadshahUW-09-ME-BE--01

2)- Shafique AhmadUW-09-ME-BE--32

3)- Syed Shahid RazaUW-09-ME-BE--34

4)- Sanaullah Khattak

UW-09-ME-BE--44

PRESENTATION MEMBERS ARE:

DESIGN AND SOLID MODELINGTERM PROJECT:

SHAFT WITH SPLINE CONNECTION:


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CONTENTS:

INTRODUCTION TO

o SHAFT

o

TORQUE TRANSMISSION ELEMENTSo SPLINES AND TYPES OF SPLINES

USES AND APPLICATIONS.

CALCULATIONS AND THEORITICAL DESIGN. SOFTWARE DESIGN (MODELING AND

ANALYSIS).

CONCLUSION.


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INDEX:

SLIDE NUMBER TOPIC NAME

1---2 1)- Introduction to shaft andtorque transmission elements

3---9 2)- Splines and types of Splines

10---13 3)- Uses and Applications

14---16 4)- Theoretical Design of straight-

sided spline shaft.17---29 5)- Software design(solid

modeling analysis) of straight-sided splined shaft system.

30 6)- Conclusion..


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Introduction to SHAFT:

v DEFINITION:

Shaft is a rotating member, usually of circular cross-section, usedto transmit power or motion.

It provides the axis of rotation, or oscillation, of elements such asgears , pulleys, flywheel, crank, sprockets and the like andcontrols the geometry of their motion.

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Torque transmission elements:

Shafts are used to transmit power betweeninput gear or pulley to the output gear orpulley.

It is necessary to provide a means oftransmitting the torque between the shaft andthe gear.

Common torque transfer elements are as

follow;

1) Keys

2) SPLINES

3) Setscrew 2


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SPLINES:

Splines are essentially stubby gear teeth formed onthe outside of the shaft and on the inside of the hub ofthe load transmitting component.

In other words;. Splines are ridges or teeth on a Driveshaft that mesh with grooves in a mating piece andtransfer Torque to it, maintaining the angularcorrespondence between them.

They are typically used to transfer high torque.

One feature of the spline is that it can be made with a3


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CONTINUES..

Stress concentration factors are greatest where the splineends and blends into the shaft, but are generally quitemoderate.

The gear shifting mechanism in automobile gear boxesrequires such type of construction.

Splines are cut on shaft by milling and on the hub bybroaching.

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Externalsplines

Internal

splines

SPLINES ONSHAFT:

SPLINES INHUB5


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Types of splines:

The following are the types of SPLINES.

1. STRAIGHT SIDED SPLINES

1. INVOLUTE SPLINES.

1. STRAIGHT- SIDED SERRATIONS.

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1)- STRAIGHT SIDED SPLINES:

Straight-sided splines connections are often used foradjustable, form-closed shaft pinion centerconnections.

Main areas of use: vehicle gear trains, machine-tools.

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2)- INVOLUTE SPLINES:

Involute splines are in the form of concentric externaland internal gear teeth. They are stub teeth withpressure angle of 30.

These splines are more popular than straight sided

splines due to greater strength relative to their size.Involute splines are self centering and tend to adjust

to an even distribution of load.

Cost of involute splines is more than straight-sided

splines.

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3)- STRAIGHT SIDED SERRATIONS:

Straight-sided serrations are used inapplications where it is important to keep theoverall size of the assembly as small aspossible.

They are used in interference joints.

Serrations joints are also used to obtain smallangular relative adjustment between the

jointed members.

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Uses and Applications:

Spines are used in;

v Power Take off system of vehicles.

v In bicycles

v In propeller attachment of air crafts.

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Power take off system of vehicles:

A power take-offor power takeoff(PTO) is asplined drive shaft, usually on a TRACTOR orTRUCK, that can be used to provide power to anattachment or separate machine. It is designed tobe easily connected and disconnected. The power

take-off allows implements to draw energy from thetractor's engine.

A power take-off at rear end of a tractor

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Splines are used in bicycles for powertransmission.

In

bicycles:

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In propeller attachment of aircraftsAir craft engines may have a spline upon which

mounts the propeller. There may be a master splinewhich is wider than the others, so that the propellermay go on at only one orientation, to maintaindynamic balance.

This arrangement is commonly found in largerengines, where smaller engines typically use apattern of threaded fasteners instead.

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Theoretical design:

Consider a shaft with spline connection like asin gear box.

Assume material of shaft = steel FeE580(Sut=770 and Syt = 580 ; ACCORDING TO

ASME CRETERIAE;

= 174

or

Lowest is the 138.6 and there are spline

connection so value is reduce up to 25% of the14

=138.6


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Now for splines;

Mt = .(1) ; where = permissible pressureon spline.

A=total area of splines.

= Mean radius of spline.And;

A=1/2 (D-d)ln ; where D=majordiameter of spline = (D+d)/4 d=minor diameter of spline l=length of hub.

n= number of

splines 15


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Design consideration:

o Let D= 70mm , d=60mm , no; of splines= n = 10

=6.5 , coefficient of friction = 0.04

Power = 30 KW , speed=N= 400 rpm

= 716197.24 N-mm

From spline equation; l= 68 mm

And ;

=> = 22036.83 N

Frictional force = = 881.47 N 16


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SOFTWARE MODELING:DESIGN THROUGH PRO-E.

We actually design the operating system of gear box tochange the gear speeds..

I. Shaft

II. Splined on shaft

III. Discs with main tooth gear .

IV. Hub at either ends of the shaft

V. Thin plates

VI. Cover disc

VII. Bracket17


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shaft

Dimensions

Diameter of shaft = 60mm

Length of shaft = 300mm

COMMANDS USED:

a) Extrude command for drawing circle

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SPLINE ON SHAFT

Number of spines = 10 teeth.

Length of splines = 68mm

Commands used:

a) extrude command for spline teeth.

a) Pattern command for teeth numbers

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Discs with main gear teeth:

No; of teeth on gear = 30

Dia of gear = 180mm

Dia of second disc = 150mmDia of last one disc = 130mm

q Commands used:

a) Extrude command

b) Patterrn command

c) Round command

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Hub at either side of the shaft:

Dia of first step = 70mm

Dia of the second step =80mm

Dia of the last step = 85mm

Command used:

Extrude command

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Thin plates and cover discs:

Command used = Extrude

Round

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Brackets:

Using extrude command.

Using hole command.

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Align form but not in compact shape

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Assembled form in compact form.

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Ansys analysis:

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CONCLUSIONS:

Splines may be considered as using multiplekeys, integral with the shaft.

Best way to transmit large torque. .

Prominent use in gear box and other reliventapplications.

Material and type of spline used is considered

for the maximum power transmission.

Stress concentration at the ends of the splinesand blend the shaft, so safety precaution istaken.

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ANY QUERIES ARE

ENTERTAINED.


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syed anis badshah(uw-09-me-001) project presentation

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