Crankshaft used to transforms the linear motion of the pistons into a rotational motion that is transmitted to the load.Piston connected with crankshaft by connecting rod.Each units of the crankshaft supported by crank bearing(usually journal bearing) In multi-cylinder engine every units piston connected with crankshaft create rotational motion according to firing order.Crank shaft alignment is necessary for smooth engine operation.
Causes of Crankshaft Deflection
- Crankshaft bearing wear
- Lack of proper lubrication system
- Improper crankshaft balancing
- Improper bearing support
- Torsional vibration
- Engine vibration
Deflection Measuring Instrument
Crankshaft deflection gauge(Analog): One complete rotation of the indicator indicate 1mm deflection.It contains 100 segments,so 0.01mm deflection can be measured.
Crankshaft deflection gauge(Digital): By it deflection can be measured more preciously than manual gauge.It can measure 0.001mm deflection.
Deformation gauge setting
Generally in every engine there is a punch mark for setting the gauge.Also it can be measured by following way