Diesel Fuel Injection Products

The pump housing is made of cast aluminium and provides support and protection for inner part.
The Camshaft is supported by two taper roller bearings and driven by the engine, to work the feed pump and plungers. The Pump element, which is the most important part, consists of a plunger and cylinder, one element for each engine cylinder.
The control rack is connected to the linkage of the governor and meshed with each pinion which rotates the plunger to control the fuel delivery quantity and in the case of a special plunger, the injection timing also. The delivery valve prevents reverse flow of fuel in the high pressure pipe and dribbles from nozzle after injection.

Fuel injection nozzles (hereafter called "nozzles") are enclosed in nozzle holders and mounted onto the engine cylinder head. The fuel, that is pressurized to a high pressure by the fuel injection pump, flows through the injection steel pipe to the nozzle.The fuel is then injected from the nozzle into the combustion chamber.
The injected fuel spreads in the cylinder, and after it reaches a high temperature and comes in contact with air, the fuel self-ignites and combusts. Therefore, the quality of injected fuel from the nozzles is an important factor in achieving a favorable combustion. Thus, the use of good nozzles that are appropriate for the engine greatly affects the performance of the engine.

The hole type nozzles shown are used on direct-injection type engines. The pintle type nozzles are used primarily on engines with a prechamber, such as the pre-combustion chamber type or swirl chamber type engines.

The fuel injection system comprises a Fuel Injection Pump, Injection Nozzles, a Fuel Filter, and a Fuel Tank. The fuel that is drawn from the fuel tanks by the Feed Pump is filtered through the Fuel Filter, and is delivered to the injection Pump.The fuel that is delivered to the Injection Pump is pressurized into a highly compressed state, and is delivered via the Injection Steel Pipe to the Nozzle. The fuel is then injected in an atomized state into the Combustion Chamber, where combustion takes place.

A portion of the fuel that is delivered to the Nozzle lubricates the sliding portion of the Nozzle and returns to the Fuel Tank via the Overflow Pipe. To prevent the fuel delivered to the injection pump from becoming excessively presurrized, an Overflow Valve is provided in the Fuel Filter or in the Injection Pump itself. If the feed pressure from the Feed Pump exceeds a prescribed value, the Overflow Valve opens to allow excess fuel to return to the Fuel Tank via the Overflow Pipe.

Diesel engines combine excellent fuel economy and power, and their popularity is growing. The development of the common rail system is a landmark in significantly improving the diesel engine capabilities. DENSO launched the world's first common rail system in 1995 and since then has been actively involved in developing advanced diesel engine technologies to meet customer needs as well as stringent worldwide emission regulations. DENSO's diesel engine management system will expand to include intake air and exhaust gas recirculation (EGR) management and exhaust gas treatment, in addition to the common rail system as a core of the management system.

The common rail system accumulates high-pressure fuel in the common rail and injects the fuel into the engine cylinder at timing controlled by the engine ECU, allowing high-pressure injection independent from the engine speed. As a result, the common rail system can reduce harmful materials such as nitrogen oxides (NOx) and particulate matter (PM) in emissions and generates more engine power. DENSO leads the industry in increasing fuel pressure and maximizing the precision of injection timing and quantity, achieving cleaner emissions and more powerful engines. DENSO's common rail systems are supplied to a variety of vehicles including passenger cars and commercial vehicles.