Chapter 4 Diesel fuel supply system Section 4 Fuel injection pump 2.Construction of Plunger Fuel Injection Pump 2.1 Sub-pump (1)plunger matching parts It consists of the plunger and plunger sleeve whose function is to improve the diesel pressure to meet the requirements of injection pressure of injector and control the amount and the time of fuel supply. 40 40 (h) d (e) Figure 4.12 The types of plunger fuel bevel groove (a)flat head and down helix groove (b)flat bottomand upper helix groove (c)upper and down double helix groove groove (d)flat head and left-straight line groove (e)flat head and right-straight line groove 械电子工程学度 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 4 Diesel fuel supply system 2. Construction of Plunger Fuel Injection Pump 2.1 Sub-pump (1) plungermatching parts It consists of the plunger and plunger sleeve，whose function is to improve the diesel pressure to meet the requirements of injection pressure of injector and control the amount and the time of fuel supply. Figure 4.12 The types of plunger fuel bevel groove （a） flat head and down helix groove （b ）flat bottom and upper helix groove （c）upper and down double helix groove groove（d）flat head and left-straight line groove （e） flat head and right-straight line groove Section 4 Fuel injection pump
Chapter 4 Diesel fuel supply system Section 4 Fuel injection pump (2)delivery valve matching parts It consists of delivery valve and delivery valve seat.Its function is ingress of oil, oil cut and quickly lower the residual pressure in the oil pipeline after oil cut,which make the injector rapidly stop oil supply to avoid leaking. Figure 4.13 Fuel outlet valve 1.fuel outlet valve 2.pressure reducing girdle band 3.Fuel outlet valve seat 4.groove 机械与电子工程膜 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 4 Diesel fuel supply system (2) delivery valve matching parts It consists of delivery valve and delivery valve seat. Its function is ingress of oil, oil cut and quickly lower the residual pressure in the oil pipeline after oil cut, which make the injector rapidly stop oil supply to avoid leaking. Figure 4.13 Fuel outlet valve 1. fuel outlet valve 2. pressure reducing girdle band 3. Fuel outlet valve seat 4. groove Section 4 Fuel injection pump