Working Principle

The plunger is driven by the cam of the camshaft. When the convex part of the cam leaves the plunger, the plunger moves down under the action of the plunger spring, the volume of the oil chamber increases, and the pressure decreases; when the radial direction on the plunger sleeve When the oil inlet hole is exposed, the fuel in the low-pressure oil cavity flows into the pump cavity along the oil inlet hole.

When the convex part of the cam pushes up the plunger, the volume in the pump chamber decreases and the pressure increases. The fuel flows back to the low pressure oil chamber along the radial oil hole on the plunger sleeve; when the plunger moves up to the plunger When the radial oil hole on the plug sleeve is completely blocked, the pressure on the pump chamber increases rapidly.

When this pressure overcomes the pre-tightening force of the outlet valve spring, the outlet valve moves upward; when the pressure relief ring on the outlet valve When the belt leaves the valve seat, the high-pressure diesel is pumped into the high-pressure fuel pipe and injected into the cylinder through the fuel injector.

As the plunger continues to move upward, when the chute on the plunger communicates with the radial oil hole on the plunger sleeve, the fuel in the pump cavity passes through the axial oil passage, the inclined oil passage and the column on the plunger. The oil hole on the plug sleeve flows back to the low pressure oil chamber, and the pump oil stops.

In our country, fuel injection pumps are based on plunger stroke, pump-cylinder center distance and structural type, and are equipped with plungers of different sizes to form several types of fuel injection pumps with varying amounts of fuel in a working cycle, forming Ⅰ, Ⅱ, Ⅲ and A, B, P, Z series to meet the needs of various diesel engines.

Technical Parameter

Common rail injection pump structure

The fuel injection pump is mainly composed of four parts: pumping mechanism, fuel supply adjustment mechanism, driving mechanism, and fuel injection pump body.

Among them, the oil pump mechanism includes plunger and barrel assembly, delivery valve assembly, etc.; oil supply amount adjustment mechanism refers to rack type oil amount adjustment mechanism or shift fork type oil amount adjustment mechanism; driving mechanism includes camshaft, tappet assembly, etc.

The fuel injection pump body is the installation base of the above three, it is required to have sufficient strength, rigidity and sealing, and easy to disassemble, adjust and maintain.

Common rail injection pump function

1. 1. Increase oil pressure (constant pressure): Increase the injection pressure to 10MPa～20MPa.
   2. Control fuel injection time (timing): fuel injection and stop fuel injection at the specified time.
   3. Control the amount of fuel injection (quantitative): According to the working conditions of the diesel engine, change the amount of fuel injection to adjust the speed and power of the diesel engine.

Common rail injection pump type

Common rail injection pumps can be divided into plunger fuel injection pumps, fuel injection pump-injector and rotor distribution fuel injection pumps.

Among them, the plunger fuel injection pump is the oldest and most widely used, and has high reliability; the fuel injection pump—the fuel injector is a fusion of the two, and is directly installed on the engine cylinder head to eliminate high-pressure fuel pipes.

The adverse effect brought by (requires an additional drive mechanism on the engine); the rotor-distributed fuel injection pump has only a pair of plungers, and mainly relies on the rotation of the rotor to achieve fuel pressure and distribution. It is small in size, light in weight, easy to use, Features such as low cost.

In our country, fuel injection pumps are based on plunger stroke, pump-cylinder center distance and structural type, and are equipped with plungers of different sizes to form several types of fuel injection pumps with varying amounts of fuel in a working cycle, forming Ⅰ, Ⅱ, Ⅲ and A, B, P, Z series to meet the needs of various diesel engines.

Packaging & Shipping

Our Services

1. 1. Inspection & Packing
      • 100% Inspect! Each product will be packed in individual box with Label on it, and boxes will be packed in carton, cartons will be packed in wooden cases.
   2. Warranty
      • 6 months after B/L date. Exclusive and unique solution can be provide to our customer by our well-trained and professional engineers and staffs.
   3. Shipment
      • We have cooperated forwarders on long term basis, can get special discount from DHL for air order and also from many shipping lines for sea order. Customer forwarder also accepted.
   4. Delivery
      • Timely delivery: 7 days for air order, 20-30 days for sea order based on containers.
   5. Documentation
      • Standard document(BL, CO, PL, IN) and Certificates(SASO, CIQ, COO, Form A, Form E, Form F, COC.) for customs clearance.