Conventional injection

Small, high-speed diesel engines require an injection system with high performance, rapid injection sequences, low weight and a small installation volume. Distributor injection pumps meet these requirements. They consist of a small, compact assembly containing the supply pump, high-pressure pump, and regulation device.

Due to its compact design, the distributor injection pump is suitable for a variety of applications in cars, light commercial vehicles, stationary engines, and construction and agricultural machines (off-highway).

Axial-piston distributor injection pumps for engines with indirect injection (IDI) generate pressures of up to 350 bar at the nozzle. For engines with direct injection (DI), both axial and radial-piston distributor injection pumps are used with peak pressures of approx. 1950 bar.

Axial-piston distributor injection pumps (VE..) are used for engines with a power output of approx. 30 kW per cylinder, and radial-piston distributor injection pumps (VR..) with engines up to 45 kW.

Distributor injection pumps are lubricated with fuel and are maintenance free.

Distributor injection pump versions:

A distinction is made between these pumps according to the type of quantity control used, their high pressure generation and regulation, as shown in the diagram:

The nozzle-and-holder assembly is required for injection of fuel into the diesel engine's combustion chamber. It has a major influence on mixture formation and combustion and therefore contributes to optimization of engine power as well as exhaust gas and noise development. Bosch offers various types of nozzle-and-holder assembly that are suitable for all conventional systems and engine types – from single-cylinder engines to car and truck engines.

Nozzles are used to atomize the fuel with precision and to distribute it in the combustion chamber so that optimal combustion can occur. At the same time, the nozzle reliably seals off the fuel system from the combustion chamber.

The range of Bosch nozzles is diverse and covers all conventional applications. It is based on the unrivaled, extensive expertise of Bosch as a vital partner for international vehicle manufacturers.

Technical features

• The clearance of moving parts stands at 0.002 mm.
• The fuel is injected into the combustion chamber with a pressure of up to 2,000 bar.
• The injected fuel quantity varies between 1 mm³ and 350 mm³ (this quantity is forced through a 0.25 mm² opening at 2,000 km/h).
• Fuel injection is much faster than the blink of an eye.