For procedures, see your mechanical laboratory manual.

Title: The Offset Slider Crank Mechanism


Aim

To study the kinematics of an offset slider-crank mechanism

Theory
An offset slider-crank mechanism is a mechanical device that can be used to convert rotary motion into linear motion or vice versa. If the line of travel of the hinged joint of the slider does not pass through the base pivot of the crank, the slider movement is not symmetric. It moves faster in one direction than the other. This is called a quick-return mechanism.

The position of an offset slider-crank is derived by a similar formula to that for the inline form.

The extended and folded dead center positions are when the crank and the coupler are collinear. The coupler link is commonly called connecting rod in slider-crank mechanisms.

For an offset slider-crank mechanism, the larger its imbalance angle is, the faster its return stroke is, and the higher its work efficiency is in a single track. Moreover, the larger its transmission angle is, the better its motion performance is.

The analytical method for designing an offset crank slider mechanism is the process by which triangular geometry is evaluated to determine generalized relationships among certain lengths, distances, and angles. These generalized relationships are displayed in the form of 3 equations and can be used to determine unknown values for almost any offset slider-crank.

Applications

  1. Lathe machines
  2. Hack saws
  3. Oscillating Cylinder Engine
  4. Reciprocating Engines/Pumps

References

  1. Synthesis and Dynamic Simulation of an Offset Slider-Crank Mechanism by Julius Thaddaeus International Journal of Scientific & Engineering Research, Volume 7, Issue 10, October-2016.
  2. The Optimal Design for Offset Slider-Crank Mechanism in Aviation Machinery by Rengang Tang and Zhaoming Meng.
  3. Jensen PW (1991) Classical and modern mechanisms for engineers and inventors. [M] Marcel Dekker, Inc., New York, p 38.
  4. Danian H (1995) Design for linkage mechanism. [M] Shanghai Science and Technology Press, Shanghai, p 158 (in Chinese).
  5. A. G. Erdman and G. S. Sandor, Mechanism Design – Analysis and Synthesis, 3rd edn (Prentice-Hall, Upper Saddle River, NJ, 1997).
  6. SLIDER CRANK MECHANISM Prof.(Dr.) Santosh Mukkawar, Vishal Falke, Vedali Chandane, Yashaswini Dhakade, Rohit Narwade Department of Engineering Sciences and Humanities, Vishwakarma Institute of Technology, Pune, (India)