Cotterjointknucklejoint description and working
- 1. Presented By:- SHUBHAM ANAND mechanical engg. dept
- 2. Cotter Joint
- 3. What Is A Cotter Joint? • Cotter joints are the joints made with the help of cotter. • Cotter joint is a flat wedge shaped piece of steel.
- 4. • cotter is used to connect rigidly two rods which transmit motion in the axial direction, without rotation. • These joints may be subjected to tensile or compressive forces along the axes of the rods. • Examples of cotter joint connections are: connection of piston rod to the crosshead of a steam engine, valve rod and its stem etc.
- 5. Cotter joint contains has mainly three components 1. Socket 2. Spigot 3. cotter
- 6. • In cotter joint there are two pipes having connection with the help of cotter. • One of the rods has a socket end into which the other rod is inserted. • the cotter is driven into a slot, made in both the socket and the rod. The cotter tapers in width (usually 1:24)* on one side of it. *Reference: design of machine elements by V B bhandari, Tata Mc Graw Hill edu.
- 9. APPLICATION OF COTTER JOINT
- 10. Advantages of cotter joint • Simple to design and manufacture • Simple to assemble and dismantle • Very high tightening force due to wedge action which prevents loosening of parts in service
- 11. Applications of cotter joint • Joint between the piston rod and the cross head of a steam engine. • Joint between the slide spindle and the fork of valve mechanism. • Joint between the piston rod and the tail and pump rod • Foundation bolt
- 12. Knuckle Joint
- 13. What is a knuckle joint? • The knuckle joint is used to connect two rods under tensile load. • This joint permits angular misalignment of the rods and may take compressive load if it is guided.
- 14. Components of Knuckle joint • Eye • Fork • Pin
- 15. • These joints are used for different types of connections e.g. tie rods, tension links in bridge structure. In this, one of the rods has an eye at the rod end. • The other one is forked with eyes at both the legs. A pin (knuckle pin) is inserted through the rod-end eye and fork-end eyes and is secured by a collar and a split pin.
- 17. APPLICATION OF KNUCKLE JOINT
- 18. Advantages of knuckle joint • simple to design and manufacture • fewer parts -less cost more realibility • simple to assemble and dismantle
- 19. Application of knuckle joint • Joints between the tie bars in a roof trusses. • Between the links of suspension bridge. • In valve mechanism of a reciprocating engine. • Fulcrum for the levers. • Joints between the links of a bicycle chain.
- 20. Thank you