Jerk-type or Plunger-type Fuel Injection Pump - Working and Animation

A presentation explaining the theory and working principle of a Jerk Type Fuel Injection Pump in delivering high pressure metered quantity of fuel to the injector nozzle in an IC engine.

The animation and presentation has been made using 3-D CAD modelling in SolidWorks 2012.

The helical groove plays a major role in controlling (or metering) the amount of fuel being injected by the pump. It is very important we understand how this control works via the control rack.

There are basically three ports, an inlet/intake port, a spill port, and an outlet port which is a spring-loaded valve-controlled nozzle.
The plunger has a lug, that is an extrusion that fits into a hole in the sleeve, while allowing its reciprocation, controls its rotational orientation by the sleeve, and in turn by the control rack that operates the sleeve.

The time when the spill port is covered during upward stroke, is the time when fuel is being injected. This duration is also known as the "effective stroke" of the pump, and can be controlled by changing the plunger's orientation, thus covering the spill port longer or shorter as the requirement may be.

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