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Design of Machine Elements – I (5ME4-04)
Lecture No.- 13
Namita Soni
Assistant Professor
MED
SKIT, Jaipur
Lecture Heading: Cotter Joint
Instructional Objectives
At the end of this lesson, the students should be
able to understand
Cotter Joint
Application of cotter joint
Design Procedure of cotter joint
Numerical Based on cotter joint
COTTER JOINT
•A cotter joint is used to connect rigidly two co-axial rods or
bars which are subjected to axial tensile or compressive
forces . It is a temporary fastening.
•A cotter is a flat wedge shaped piece of rectangular cross
section and its width is tapered (either on one side or on both
sides) from one end to another for an easy adjustment.
.
Socket Cotter
Spigot
APPLICATIONS OF COTTER
1. Connection of the piston rod with the cross heads.
2. Joining of tail rod with piston rod of a wet air pump.
3. Foundation bolt.
4.Connecting two halves of fly wheel (cotter and dowel
arrangement).
Design of Spigot and Socket Cotter
.
CONT…
Let P = Load carried by the rods
d = Diameter of the rods
d₁ = Outside diameter of socket
d₂ = Diameter of spigot or inside diameter of socket
d₃ = Outside diameter of spigot collar
t₁ = Thickness of spigot collar
d₄ = Diameter of socket collar
c = Thickness of socket collar
b = Mean width of cotter
l = Length of cotter
t = Thickness of cotter
a = Distance from the end of the slot to the
end of rod
σt= Permissible tensile stress for the rods
material
τ = Permissible shear stress for the cotter material
σc= Permissible crushing stress for the cotter material
SPIGOT BREAKING IN
TENSION OUTSIDE THE
JOINT
SPIGOT BREAKING IN
TENSION ACROSS
SLOT
Cotter joint– modes of failure
lect 13 DESIGN AND FAILURE OF COTTER JOINT.pptx
SOCKET
BREAKING IN
TENSION ACROSS
SLOT
SHEARING FAILURE OF THE SPIGOT END
DOUBLE SHEARING
OF SOCKET END
DOUBLE SHEARING OF
COTTER PIN
1. Failure of the rod (Spigot) in tension
P= Area X Tensile
stress
2. Failure of spigot in tension across the weakest
section (or slot)
Area Resisting=
P
d2
3. Failure of the socket in tension across the slot
Area Resisting
Load P =
4. Failure of cotter in shear
5. Failure of Spigot end in shear
6. Failure of socket end in shearing
7. Failure of the rod (spigot) or cotter in crushing
d2
8. Failure of the socket collar in crushing
9. Bending failure of cotter
It is required to design a cotter joint to connect
two steel rods of equal diameter. Each rod is
subjected to an axial tensile force of 50 kN. Design
the joint and specify its dimensions
Part-1
Selection of materials
Part-2 Selection of factor of safety
Part-3
Calculation of permissible stress
Part-4
Calculations of dimensions
Step-1 Diameter of rod
Step-2
Thickness of cotter
Step-3
Diameter of spigot
P
Step-4
Outer diameter of socket
Load P =
Step-5
Diameter of spigot collar and socket collar
Step-6
Dimensions of a and c
Step-7
Width of cotter
Step-8
Check crushing and shear stress in spigot
Step-9
Check for crushing and shear stress in socket end
lect 13 DESIGN AND FAILURE OF COTTER JOINT.pptx
Thank You

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