Unit common-rail pump assembly for single cylinder diesel

Abstract

The invention provides a unit common-rail pump assembly for a single cylinder diesel. The unit common-rail pump assembly for the single cylinder diesel comprises a pump body, a main valve seat detachably connected with the pump body, and an oil inlet structure arranged on the main valve seat, wherein a low-pressure oil cavity communicating with the oil inlet structure is arranged in the main valveseat; a proportional electromagnetic valve for controlling the oil inlet amount of the oil inlet structure is arranged in the low-pressure oil cavity; a pump head part communicating with the low-pressure oil cavity and used for oil inlet conveying control is arranged on the pump body; a plunger sleeve connected with the pump head part is arranged on the pump body and is provided with a high-pressure oil cavity communicating with an oil inlet cavity and an oil outlet cavity of the pump head part so as to push oil into the oil outlet cavity; a plunger movably connected with the inner wall of the plunger sleeve and used for providing a pushing force is arranged in the high-pressure oil cavity, and is connected with a drive shaft; and the pump head part is connected with an external oil pipe.Through the unit common-rail pump assembly for the single cylinder diesel provided by the invention, the production cost can be effectively reduced, and the reliability and the service life are improved.

Description

technical field [0001] The invention belongs to the field of single-cylinder diesel engines, in particular to a single common rail pump assembly for single-cylinder diesel engines. Background technique [0002] With the increasingly stringent emission regulations, high pressure common rail fuel injection system has become the mainstream of diesel fuel injection system. The electronic control technology of diesel engine provides a realistic possibility for diesel engine to obtain better emission index, power performance and economic performance. The high-pressure fuel pump is an important part of the high-pressure common rail fuel injection system, and its technical level directly determines the reliability, power and economy of the end product. Therefore, how to improve the oil supply stability, oil supply capacity, installability and low processing cost of the high-pressure oil pump has become a problem that must be considered in product development. [0003] The main bod...

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Problems solved by technology

The existing problems are: 1. The shape is complex; the rough is mainly prepared by hot forging or cold extrusion. The more complex the shape, the more complicated the production process, the higher the cost, and the higher the probability of defective products. High melting point, complex structure requires long processing time, corresponding high energy consumption for heating, and relatively high environmental pollution

2. In the process of blank processing, the structure is complex; the center of gravity deviates from the center of rotation of the main structure. All processing equipment that requires blank rotation processing requires eccentric weights for fixtures. Since the blank is rough processing, the precision is low. Dimensions and The weight will be different. If the eccentric weight is not well done, due to the centrifugal force, the precision of the high-speed rotating equipment will be damaged, and the processing precision will also be reduced.

3. Due to the complex shape of the overall structure of the main body of the oil pump, the common three-jaw chuck of the machine tool cannot be used to clamp the workpiece for processing. It is necessary to design and customize a special fixture and install it on the machine tool to reduce the versatility of the machine tool and increase the production preparation time. , reduce efficiency, increase cost

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