Diesel Distributor Fuel-Injection Pumps VE - Gnarlodious

Pump assembly with distributor headGenerates the high pressure and distributes the fuel to the respective fuel injector.1 Yoke, 2 Roller ring, 3 Cam plate, 4 Distributor-plunger foot, 5 Distributor plunger, 6 Link element,7 Control collar, 8 Distributor-head flange, 9 Delivery-valve holder, 10 Plunger-return spring,4...8 Distributor head.Fuel-injectiontechniques1 2 34 5 6 7 10 8 9UMK0327Yplate by a pin. The distributor plungeris forced upwards to its TDC positionby the cams on the cam plate, and thetwo symmetrically arranged plungerreturnsprings force it back down again toits BDC position.The plunger-return springs abut at oneend against the distributor head and atthe other their force is directed to theplunger through a link element. Thesesprings also prevent the cam platejumping off the rollers during harshacceleration. The lengths of the returnsprings are carefully matched to eachother so that the plunger is not displacedfrom its centered position (Fig. 8).Fig. 8Cam plates and cam contoursThe cam plate and its cam contour influencethe fuel-injection pressure andthe injection duration, whereby camstroke and plunger-lift velocity are thedecisive criteria. Considering the differentcombustion-chamber configurations andcombustion systems used in the variousengine types, it becomes imperative thatthe fuel-injection factors are individuallytailored to each other. For this reason, aspecial cam-plate surface is generated foreach engine type and machined into thecam-plate face. This defined cam plate isthen assembled in the correspondingdistributor pump. Since the cam-platesurface is specific to a given engine type,the cam plates are not interchangeablebetween the different VE-pump variants.17