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Automatic centering plunger structure

An automatic centering and plunger technology, which is applied in the direction of engine components, machines/engines, liquid fuel engines, etc., can solve the problems of poor surface wear resistance and corrosion resistance, poor reliability of plunger service life, automatic pump body plunger hole For medium problems, it can achieve strong wear resistance and corrosion resistance, prolong service life, ensure service life and work reliability

Inactive Publication Date: 2021-08-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing plunger structure, the working section of the plunger is a cylindrical design with equal diameters up and down, which cannot be automatically centered in the plunger hole of the pump body, and the working section of the plunger will be biased under the action of radial force, causing the plunger One side of the working section is severely worn, which shortens the life of the plunger, and at the same time causes high-pressure oil leakage, which affects the establishment of high pressure
At the same time, the finished surface of the working section of the existing plunger is a whole, which is difficult to process
Moreover, in the existing plunger structure, the surface wear resistance and corrosion resistance of the plunger working section are relatively poor, and the coating of the plunger working section is easy to fall off, so that the service life and working reliability of the plunger are relatively poor

Method used

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  • Automatic centering plunger structure
  • Automatic centering plunger structure
  • Automatic centering plunger structure

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This embodiment includes three improvements, which are the tapered design of the plunger working section with a small upper part and a larger bottom, the processing ring belt of the plunger working section and the coating treatment of the plunger working section.

[0029] Improvement 1: The tapered design of the plunger working section is small at the top and large at the bottom.

[0030] Such as figure 1 As shown, the working section of the plunger adopts a tapered design with a small top and a large bottom. The upper end of the working section of the plunger is close to the oil pressure end, and the lower end of the working section of the plunger is far away from the oil pressure end. The tapered design with small top and big bottom is a structure that is small near the oil pressure end and large away from the oil pressure end. When the high pressure is established, the high pressure oil will be charged into the figure 1 In the annular gap between the plunger and th...

Embodiment 2

[0053] This embodiment is mainly aimed at implementing an alternative solution to the improvement of the first embodiment. A pressure equalizing ring groove is set in the working section of the plunger to replace the tapered design of the upper and lower sizes. However, the ring design and coating treatment in the first embodiment are still retained in the second embodiment.

[0054] Such as Figure 9 As shown, the pressure equalizing ring groove evenly arranged in the working section of the plunger is used to replace the tapered design of the upper and lower sizes of the working section, which can also realize the automatic centering of the plunger and solve the problem of serious wear on one side of the plunger. The pressure equalizing ring groove is n annular grooves distributed on the surface of the working section of the plunger are used to form an annular oil chamber for automatic centering of the plunger, where n is an integer greater than or equal to 2.

[0055] The ...

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Abstract

The invention discloses an automatic centering plunger structure which is characterized in that a plunger working section adopts a tapered design with a small upper part and a large lower part or is uniformly provided with grading ring grooves, so that the plunger is automatically centered in the working process. Abrasion of the automatically-centered plunger can be reduced in the working process, and the service life of the plunger is prolonged. The working section of the plunger adopts titanium nitride coating treatment, so that the wear resistance of the plunger is improved. The thickness of the coating is controlled within a certain range, the coating is not prone to falling off, and the service life and the working reliability of the plunger are guaranteed.

Description

technical field [0001] The invention relates to the technical field of engine fuel oil, in particular to an automatic centering plunger structure. Background technique [0002] The plunger is a key part of the fuel system of a diesel engine. Whether it is a pump nozzle, an electronically controlled unit pump or a high-pressure common rail, the plunger is required to establish a high fuel injection pressure. The material selection, structural design and processing technology of the plunger will affect the injection pressure, fuel injection volume and fuel injection rate of the fuel supply system. [0003] In the existing plunger structure, the working section of the plunger is a cylindrical design with equal diameters up and down, which cannot be automatically centered in the plunger hole of the pump body, and the working section of the plunger will be biased under the action of radial force, causing the plunger One side of the working section is severely worn, which shorten...

Claims

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Application Information

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IPC IPC(8): F02M59/02F02M59/44F02M63/00F04B53/14
CPCF02M59/02F02M59/44F02M63/00F04B53/14
Inventor 王字满杨旭超武治平孙柏刚黎一锴
Owner BEIJING INSTITUTE OF TECHNOLOGYGY