The plunger on the cylindrical surface milling straight chute, chute chamber and plunger pump cavity above the channel communication. The plunger sleeve is provided with two round holes are associated with a fuel injection pump body on the low pressure oil cavity. A plunger actuated by a cam, the plunger piston sleeve for reciprocating linear motion, and in addition it can around its own axis in a certain angle range. The fuel injection pump plunger main principles such as the following.

( 1) suction process when the plunger moves downwards, the fuel from the low pressure oil chamber through an oil inlet hole and is suspended into pump cavity.

( 2) the oil pressure process in the plunger from BDC shift process, at first a portion of the fuel from the pump cavity pushes to the low pressure oil chamber, until the upper part of the plunger piston cylinder ( the two oil holes are fully closed. Thereafter the plunger inheritance rise, the upper part of the plunger piston fuel pressure increases rapidly enough to overcome the oil outlet valve spring force, valve began to rise. When the valve of the cylinder ring band left oil outlet valve seat, high pressure fuel from the pump chamber through a high-pressure oil pipe flow injector. When the fuel pressure is higher than the fuel injection pressure, fuel injector is the start of fuel injection.

( 3) the oil return process when the nozzle moves to continue, chute and the oil hole begin to connect, so the pump chamber pressure drops rapidly, the oil reading under pressure in the spring immediately return, fuel injection pump oil supply. Thereafter the piston still continue upward, until the cam is the highest lift, but no longer pump oil.

Injection pump plunger pump principle mentioned above, I hope for your help, in order to allow us to travel more convenient, quick, do not appear any problems, you have any problems or questions can contact us, welcome customers to discuss cooperation.