easy explained shafts & its types by hashim hasnain
TRANSCRIPT
Shafts
BY
Hashim Hasnain Hadi Ghulam Sarwar Muhammad Junaid Ashter Abbas
5th SemesterB.E Mechanical
Session 2013-2014
Materials usedTypes of shafts
Stresses in shaftsDesign of shaftsShafts subjected to bending moment onlyTypes of shaft coupling
Introduction of Shaft
We Shall Focus on:
Shaft Rotating machine element.
used to transmit power from one part to another part of a machine.
pulleys and gears are mounted on it.
Transmit torque and bending moment
Materials used for shafts
Properties of materials used in shafts: High Strength Good machinability Low notch sensitivity factor Good heat treatment properties High wear resistance
Carbon steels of grades: 40c8, 45c8, 50c4 and 50c12.
Stresses in Shafts Shear stress due to transmission of torque.
Bending Stress due to forces upon machine elements: Pulley Gear Weight of shaft itself
Stresses due to combined torsional and bending loads.
CONTINUE…. On the basis of strength:
Twisting moment
Bending moment
Twisting and bending moments
Axial load in addition to combined Twisting and bending moments
Bending twisting
Types of Shaft Couplings
coupling
Rigid coupling
Sleeve coupling
Flange coupling
Compression coupling
Flexible coupling
Bushed Pin Type
CouplingUniversal Coupling
Oldham Coupling
Rigid Coupling
Sleeve coupling
Connect two perfectly aligned shafts
Type of rigid coupling
Made of cast iron
Fitted over the ends of two shafts by means of gib head key
Clamp or Compression Coupling
Flange coupling
Muff is divided into two parts which are bolted together Cast iron
Type of rigid coupling
Made of cast iron
Fitted over the ends of two shafts by means of gib head key
Flexible Coupling
Bushed pin type flexible coupling Connect two misaligned shafts
Modification of rigid type flange coupling
Use pins
Rubber or leather bushes are used
Oldham Coupling
Universal coupling
Connect two lateral misaligned shafts
Also called hooke’s coupling
Connect two shafts whose axes intersect at a small angle