Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev

Mechanical Engineering SSC JE (Technical)

Mechanical Engineering : Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev

The document Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).
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Chapter 7

COTTER AND KNUCKLE JOINTS

  • A cotter is a flat wedged-shape piece of rectangular cross-section and its width is tapered from one end to another for an easy adjustment. 
  • The cotter is usually made of mild steel or wrought Iron. A cotter joint is a temporary fastening and is used to connect rigidly to co-axial shafts which are subjected to axial tensile or compressive forces. 
  • It is usually used in connecting a position rods to the cross head of a reciprocating steam engine, strap end of connecting rod etc.
  • Types of Cotter Joints 
    • Socket and Spigot cotter joint 
    • Sleeve and cotter joint 
    • Gib and cotter joint.
  • Socket and Spoigot Cotter Joint

Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev

 

  • Formula
    • Failure of rods in tension
      Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev
    • Failure of spigot in tension across the weakest section
      Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev
    • Failure of the rod or cotter in crushing p = d2.t.sc
    • Failure of socket in tension across the slot.
      Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev
    • Failure of cotter in shear (double shear) p = 2 bt. ts
    • Failure of socket collar in crushing  p = (d4 – d2) . t . sc
    • Failure of socket end in shearing p = 2(d4 – d2) c × ts
    • Failure of rod end in shear p = 2ad2 . ts
    • Failure of spigot collar in crushing
      Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev
    • Failure eof spigot collar in shearing
      Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev

 

  • Knuckle Joint
    • A knuckle joint is used to connect two rods which are under the action of tensile force. If the joint is guided, the rods may support a compressive load. 
    • Its use may be find in the link of a cycle chain, the rod joint for roof truss, valve rod joints with eccentric rod, pump rod joint, tension link in bridge structure and lever and connection of various types. 
    • The material used for the joint may be steel or wrought iron.

      Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev
      Chapter 7 - Cotter And Knuckle Joints - Machine Design, Mechanical Engineering Mechanical Engineering Notes | EduRev
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