# Cotter & Knuckle Joints Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

## Mechanical Engineering: Cotter & Knuckle Joints Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering

The document Cotter & Knuckle Joints Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).
All you need of Mechanical Engineering at this link: Mechanical Engineering

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

• 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.

The document Cotter & Knuckle Joints Notes | Study Mechanical Engineering SSC JE (Technical) - Mechanical Engineering is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).
All you need of Mechanical Engineering at this link: Mechanical Engineering
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## Mechanical Engineering SSC JE (Technical)

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