With high pressure, the unit pump ensures excellent mixture preparation and combustion of fuel with specific high performance, which contributes towards compliance with emission guidelines and a reduction in fuel consumption.
of injection pressure for efficient combustion.
of reliable operation due to robust design.
Drag to rotate
A fuel pump (injection pump) is fitted for each engine cylinder. The pump piston is fitted in the pump cylinder with such precision that high injection pressure is guaranteed, even at low speeds. The 2/2-way valve provides the full range of functions.
Engine block
Pump body
Pump piston
Return spring
Roller plunger
Anchor plate
Stator
Solenoid valve needle
Filter
Fuel feed
Fuel return
Retaining device
Fixing groove
Solenoid valve needle lift stop
The unit pump system is a modular, time-controlled single-pump injection system. Each engine cylinder is supplied by a separate module consisting of a high-pressure plug-in pump with integrated, fast-switching solenoid valve and nozzle holder assembly. The unit pump is integrated in the diesel engine block and powered directly by an injection cam on the engine camshaft via a roller plunger.
If the solenoid valve is open, the pump cylinder can be filled during the suction stroke of the pump piston and return flow is possible during the delivery stroke. If the solenoid valve is energized and therefore closed, a pressure in the high-pressure range builds up between the pump piston and injection nozzle during the delivery stroke of the pump piston. If the nozzle opening pressure is exceeded, fuel is injected into the engine's combustion chamber. Closure of the solenoid valve determines the start of the injection process, while opening of the valve determines the injection quantity.
Max. system pressure
Lifespan
Engine output per cylinder
Housing
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