1. Title:- Flange Coupling
Mechanical Engineering Department
Submitted By -
Name : Rupesh Kumar
Section : B
Roll No. : 23
Sem : 6th
Faculty Advisor -
Prof. S. S Kumbhalkar
(Prof. Mech. Engg. Dept.)
Session 2017-18
Subject –Machine Design - II
TAE II: Technical Presentation

2. COUPLINGS
Couplings are mechanical devices which connect one shaft to another or to
couple a drive shaft to a driven shaft.
Shaft coupling are used in machinery for next purposes.
1. To provide for the connection of shafts of units that are
manufactured separately, such as a motor and a generator, and to
provide for disconnection for repairs or alterations,
2. To provide for misalignment of the shafts or to introduce
mechanical flexibility.
3. To reduce the transmission of shock loads from one shaft to
another.
4. To introduce protection against overloads.
5. T o alter the vibration characteristics of rotating units.

3. Couplings
Coupling is a device used to connect two shafts together at their
ends for the purpose of transmitting power
MotorCoupling
Pump

4. Flange coupling
• A rigid flange coupling consists of two cast iron
flanges are mounted and keyed on the ends of each
shaft and are drawn together by a series of bolts.
• For more accurate connection, on the ends of the
flange couplings machined the centering surfaces.
• The bolts holding the flanges together are
sometimes reduced in diameter so that they would
readilybreak or shear off in the event of a damaging
overload that to serve as a safety device.

6. Steps of design Rigid flange coupling
• Step:1 Calculate the diameter torque to be transmitted –Mt- use the
equation.
• Step 2 :Calculate the diameter of the shaft-d-use the equation (Assume di=0)
Round off the shaft diameter to R20 series.
• Step 3: Based on the diameter of shaft calculated select the coupling and Note
down its dimensions.
• Step 4 :CHECKING FOR SHEAR STRENGTH OF THE BOLT.
1. Calculate Ft- Refer P.7.106 use equation Ft=2Mt/D2
2. Calculate [Ft] use equation Ft
3. Use equation [Ft] = n x d2/4 x [] ; Where [] is allowable shear
stress of shaft material.Compare Ft and [Ft]
4. For safer Design Ft  [Ft] ; If Ft >[Ft] select Next higher coupling
and repeat theprocedure from step 3 until Ft  [Ft]

7. • Step 5 :CHECKING FOR BEARING STRENGTH OF THE BOLT
1) Note down the value of (b)
2) Calculate (Ft) ; use the equation [Ft] = nd2 b [b]
3) Compare Ft & (Ft)
For safer design F (Ft)
If Ft> (Ft) select Next higher coupling and repeat the Step 3 & Step 5
Ft  [Ft]
• Step 6 :Draw a neat sketch of the coupling with dimensions.
Compare the allowable torque (Mt) with the
actual torque Mt
For safer design Mt  [Mt]
If Mt  [Mt] then increase the width & thickness or
length of the key to Next higher standard values and repeat from
Step 10.1 until Mt  [Mt]
• Step:7 Draw a neat sketch of the coupling with dimensions.
If flange coupling satisfies all the strength
requirements, then it is selected for the
application.