Kinematic Inversions 2
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The document outlines a lecture focused on mechanisms such as four-bar chains and slider-crank systems, explaining kinematic inversions and their applications. It discusses various mechanisms including beam engines, coupling rods, and oscillating cylinder engines, as well as their conversions between rotary and reciprocating motion. The lecture also previews future topics including numerical parts of the mechanisms and mechanical advantages.
Kinematic Inversions 2
- 2. Summary of previous lecture • Degrees of freedom • Gruebler’s Criterion • Grashof’s four-bar mechanism • Kinematic Inversions • Types of Kinematic Chains
- 3. Today’s lecture • Few Videos on various mechanisms • Kinematic Inversions •Inversions of Four Bar Chain •Inversions of Single Slider Crank Chain •Inversions of Double Slider Crank Chain
- 7. Types of Kinematic Chains • Four bar chain • Single slider crank chain • Double slider crank chain
- 8. Inversions of Four Bar Chain • Beam engine (crank and lever mechanism) • Coupling rod of a locomotive (Double crank mechanism) • Watt’s indicator mechanism (Double lever mechanism) The purpose of this mechanism is to convert rotary motion into reciprocating motion.
- 9. Inversions of Four Bar Chain Beam engine (crank and lever mechanism)
- 10. Inversions of Four Bar Chain Crude Oil Lifting Pump (Beam Pump) instaled at Marmul oil field
- 11. Inversions of Four Bar Chain • Beam engine (crank and lever mechanism) • Coupling rod of a locomotive (Double crank mechanism) • Watt’s indicator mechanism (Double lever mechanism) This mechanism is meant for transmitting rotary motion from one wheel to the other wheel
- 12. Inversions of Four Bar Chain • Beam engine (crank and lever mechanism) • Coupling rod of a locomotive (Double crank mechanism) • Watt’s indicator mechanism (Double lever mechanism) Watt's straight line mechanism
- 13. • A single slider crank chain is a modification of the basic four bar chain. It consist of one sliding pair and three turning pairs. • It is usually, found in reciprocating steam engine mechanism. • This type of mechanism converts rotary motion into reciprocating motion and vice versa. As the crank rotates, the cross-head reciprocates in the guides and thus the piston reciprocates in the cylinder. Single Slider Crank Chain
- 14. Pendulum Pump: In this mechanism, the inversion is obtained by fixing the cylinder or link 4 (i.e. sliding pair), as shown below. In this case, when the crank (link 2) rotates, the connecting rod (link 3) oscillates about a pin pivoted to the fixed link 4 at A and the piston attached to the piston rod (link 1) reciprocates. Inversion of Single Slider Crank Chain
- 15. Oscillating Cylinder Engine: The oscillating cylinder engine mechanism, is used to convert the reciprocating motion into rotary motion. In this mechanism, the link 3 forming the turning pair is fixed. The link 3 corresponds to the connecting rod of a reciprocating steam engine mechanism. When the crank (link 2) rotates, the piston attached to piston rod (link 1) reciprocates and the cylinder (link 4) oscillates about a pin pivoted to fixed link at A. Inversion of Single Slider Crank Chain
- 16. Rotary Internal Combustion Engine: It consists of seven cylinders in one plane and all rotates about fixed centre D, whereas the crank (link 2) is fixed. In this mechanism, when the connecting rod (link 4) rotates, the piston (link 3) reciprocates inside the cylinders forming link 1. Inversion of Single Slider Crank Chain
- 17. Inversion of Single Slider Crank Chain
- 18. Inversion of Single Slider Crank Chain
- 19. Inversion of Single Slider Crank Chain
- 20. Crank and Slotted Quick Return Mechanism: This mechanism is mostly used in shaping machines, slotting machines. In this mechanism, the link AC (link 3) forming the turning pair is fixed. The link 3 corresponds to connecting rod of a reciprocating steam engine. The crank CB revolves with uniform angular speed about the fixed centre C. A sliding block is attached to the crank pin at B slides along the slotted bar AP and thus AP to oscillates about the pivoted point A. Inversion of Single Slider Crank Chain
- 21. Crank and Slotted Quick Return Mechanism: Inversion of Single Slider Crank Chain
- 22. Next lecture • Inversions of Single Slider Crank Chain • Crank and Slotted Quick Return Mechanism (Numerical part) • Inversions of Double Slider Crank Chain • Mechanical Advantages
- 23. Commonly Used Lınks and Joınts Find the number of Degree of Freedom?
- 24. Contact details: Rohit Kumar Singla Email ID: rohit.kumar@thapar.edu