Unbalance in Multicylinder Engines – In-line, V-twin and Radial Engines; Balancing Techniques

Module 4 : Unbalance in Multicylinder Engines – In-line, V-twin and Radial Engines; Balancing Techniques.

Lecture 1 : Unbalance in Multicylinder Engines – In-line, V-twin and Radial Engines; Balancing Techniques.

Consider a single cylinder engine (Fig 4.1) such as is used in a typical scooter or motor bike. We have analyzed the inertia forces in this case based on our approximate dynamic equivalent link model of connecting rod – replacing it by two masses one at crank pin and another at the piston end. Thus effectively there are reciprocating masses which included the mass of the piston and that part of the connecting rod which was lumped on the piston pin; rotating parts which included the effective mass of crank at its pin and part of connecting rod lumped at crank pin.

Figure 4.1 Typical Single Cylinder Engine.