1. The mechanical pump Introduction
No matter what kind of key oil pump is a “pump” character. The number of pump oil pump (mechanical engineering) the amount, pressure and time must be very precise and automatically adjusted according to load. Pump is a precision machining, manufacturing process complex parts, automotive diesel pumps generally are made at home and abroad of the few specialized plants.
Key Parts
of the fuel pump plunger, the syringe if the hospital common metaphor, the movable stopper called a plunger, the syringe plunger sleeve is called, mounted on the barrel which is assumed one end of the spring against the plunger, the other end of the plunger in contact with the camshaft, when the camshaft substantially single rotation motion, the plunger will move up and down in a piston sleeve, which is the fuel pump plunger.
the plunger and the plunger is processing a very sophisticated set of accessories. The plunger body has an inclined groove, the plunger put a small hole called a suction port, the suction port is full of diesel, when the plunger is inclined groove facing the suction port, diesel oil into the plunger comprising a plunger is camshaft when a certain height to the top of the plunger and the suction port is inclined staggered grooves, the suction port is closed, so that neither the suction nor diesel fuel can be pressed out, when the compression piston continues to rise diesel, diesel oil pressure to a certain degree will open the top one-way rush out into the nozzle valve before the combustion chamber from the injector into the cylinder. Each piston displaces a certain amount of diesel fuel injected into the cylinder only part of the rest go by the back vent hole and take advantage of change vent to regulate the amount of oil to go back to the fuel injection quantity. Moving the
the plunger when the plunger rises to the ‘points’ down, tilt piston groove will encounter with the suction port, the diesel has been sucked into the inside of the plunger sleeve, the operation described above is repeated again. Inline fuel injection of each cylinder corresponds to a plunger system, four cylinders there are four plunger system, relatively large size, is used in medium-sized car. Such as diesel buses and large trucks on the general use of inline fuel injection pump.