Fuel Pump | Injection Pump | Construction of Fuel Pump / Injection Pump | Working of Fuel Pump / Injection Pump
-: Fuel Pump / Injection Pump :-
Construction of Fuel Pump / Injection Pump :- It consists of a barrel in which a plunger reciprocates when driven by a camshaft . The plunger is a single acting component . The barrel and plunger has a very small clearance for smooth movement of plunger and it also provides the perfect sealing even at high pressure . The pump barrel has inlet and control port . At the top of the barrel a spring loaded delivery valve is provided .
A rake and pinion arrangement is provided to rotate the plunger for controlling the quantity of fuel delivery per stroke.
Working of Fuel Pump / Injection Pump :- When the plunger is at its bottom stroke the spill port and supply port are uncovered oil form pressure pump after being filtered is forced into the barrel . When the plunger moves up due to cam and tappet mechanism , a stage reaches when both the ports spill port and supply port are closed and with the further upward movement of the plunger the fuel gets compressed . The high pressure thus developed lifts the delivery valve off its seats and fuel flows to atomiser through the passage .
With further rise of the plunger at a certain moment , the supply port is connected to the fuel in the upper part of the plunger through the rectangular vertical groove by the helical groove as a result of which a sudden drop in pressure occurs and the delivery valve falls back and occupies its seat against the spring force .
-: Fuel Pump / Injection Pump :-
Construction of Fuel Pump / Injection Pump :- It consists of a barrel in which a plunger reciprocates when driven by a camshaft . The plunger is a single acting component . The barrel and plunger has a very small clearance for smooth movement of plunger and it also provides the perfect sealing even at high pressure . The pump barrel has inlet and control port . At the top of the barrel a spring loaded delivery valve is provided .
A rake and pinion arrangement is provided to rotate the plunger for controlling the quantity of fuel delivery per stroke.
Working of Fuel Pump / Injection Pump :- When the plunger is at its bottom stroke the spill port and supply port are uncovered oil form pressure pump after being filtered is forced into the barrel . When the plunger moves up due to cam and tappet mechanism , a stage reaches when both the ports spill port and supply port are closed and with the further upward movement of the plunger the fuel gets compressed . The high pressure thus developed lifts the delivery valve off its seats and fuel flows to atomiser through the passage .
With further rise of the plunger at a certain moment , the supply port is connected to the fuel in the upper part of the plunger through the rectangular vertical groove by the helical groove as a result of which a sudden drop in pressure occurs and the delivery valve falls back and occupies its seat against the spring force .
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