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
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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
- Formula
- Failure of rods in tension
- Failure of spigot in tension across the weakest section
- Failure of the rod or cotter in crushing p = d2.t.sc
- Failure of socket in tension across the slot.
- 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
- Failure eof spigot collar in shearing
- Failure of rods in tension
- 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.
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