Diesel injector for diesel engine

A fuel injector and diesel engine technology, applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve problems such as deformation, affecting the performance of electronically controlled fuel injectors, and increasing the radial friction between the needle valve body and the needle valve. Achieve the effects of reducing deformation, improving precision and motion stability, and reducing radial friction

Active Publication Date: 2014-07-30
NO 711 RES INST CHINA SHIPPING HEAVY IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, in order to achieve precise and stable injection control under high pressure for high-pressure common rail electronically controlled injectors, the movement stability of the needle valve is very important. However, under the above-mentioned various external forces, the internal cavity of the needle valve will be deformed. Thus increasing the radial friction between the needle valve body and the needle valve, affecting the performance of the electronically controlled injector

Method used

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  • Diesel injector for diesel engine
  • Diesel injector for diesel engine
  • Diesel injector for diesel engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a fuel injector for a diesel engine includes a needle valve 1, a needle valve body 2, a fastening nut 3, and an oil chamber 4, etc. The needle valve 1 and the needle valve body 2 constitute a needle valve assembly. The needle valve 1 is arranged in the needle valve body 2 through precision fitting. The needle valve body 2 has a supporting surface 201, and the fastening nut 3 has a protrusion 301. The needle valve The annular lower surface of the supporting surface 201 of the body 2 is attached to the annular upper surface of the protruding part of the fastening nut 3 to form a mating sealing surface. The oil chamber 4 is arranged between the needle valve 1 and the needle valve body 2. The plane of the sealing surface formed by the supporting surface 201 of the needle valve body 2 and the protrusion 301 of the fastening nut 3 is set as L1, and the plane of the top surface of the oil chamber 4 is set as L2. In the case that the plane L2 where th...

Embodiment 2

[0046] The fuel injector for diesel engine provided in this embodiment is similar in structure to the fuel injector in embodiment 1, and also includes a needle valve 1, a needle valve body 2, a fastening nut 3, and an oil receiving cavity 4 Wait. The connection relationship between the components is the same as that described in Embodiment 1, and will not be repeated here.

[0047] The difference from Example 1 is that the combination figure 2 — Figure 4 In the fuel injector provided in this embodiment, the needle valve body 2 is provided with two symmetrical positioning pin holes 21 and two symmetrical oil inlet passages 23. The positioning pin hole 21 is provided on the upper surface of the needle valve body 2 vertically downward in the axial direction. See figure 2 with image 3 One end of the oil inlet passage 23 located in the needle valve body 2 is connected with the oil receiving cavity 4, and the other end is formed with two oil inlet holes 31 on the upper surface of...

Embodiment 3

[0059] In this embodiment, the fuel injector provided in this embodiment has a similar structure to the fuel injector in embodiment 1 or 2, and also includes a needle valve 1, a needle valve body 2, a fastening nut 3, and Oil chamber 4 etc. The connection relationship between the components is the same as that described in Embodiment 1 or 2, and will not be repeated here.

[0060] Different from Example 1 or 2, the combination figure 2 , The inner side of the needle valve body 2 is provided with a reaming hole 22, which is located at the uppermost end of the mating surface of the needle valve body 2 and the needle valve 1. The width (diameter) of the reaming hole 22 in the radial direction and the depth in the axial direction are not less than the radial deformation of the needle valve body 2 and the needle valve 1. Specifically, the diameter of the enlarged hole 22 is increased by 0.1 to 3 mm from the diameter of the needle valve 1. The depth of the reamer 22 in the axial dir...

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Abstract

The invention discloses a diesel injector for a diesel engine. The diesel injector comprises a needle valve, a needle valve body, a fastening screw cap and a diesel containing cavity; the needle valve is arranged in the needle valve body; the diesel containing cavity is arranged between the needle valve and the needle valve body; the needle valve body is provided with a support surface; the fastening screw cap is provided with a protruded part; the annular lower surface of the support surface of the needle valve body is fitted with the annular upper surface of the protruded part of the fastening screw cap, so a match sealing surface is formed; an expanded hole is formed in the inside of the needle valve body; the expanded hole is positioned in the topmost end of the match surface between the needle valve body and the needle valve. The expanded hole is additionally formed in the needle valve, so the aim that the radial friction force of a needle valve coupler is not increased by the top deformation of the match surface between the needle valve body and the needle valve is effectively ensured, and the control precision and stability of the spraying are improved.

Description

Technical field [0001] The invention relates to a fuel injection system, in particular to a fuel injector for a diesel engine. Background technique [0002] Diesel engine high pressure common rail injection technology is currently the most effective measure to improve diesel engine performance and reduce emissions. The diesel engine high pressure common rail system has the characteristics of flexible adjustment of fuel injection pressure, fuel injection timing, flexible control and free adjustment of fuel injection volume, which can effectively reduce diesel fuel consumption and emissions and improve power performance. The high pressure common rail electronically controlled injector is the core and key component of the high pressure common rail system, and its structural parameters and performance directly affect the response speed, fuel injection rate, reliability and other performance of the entire high pressure common rail system. [0003] The existing high pressure common rail...

Claims

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Application Information

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IPC IPC(8): F02M61/10
Inventor 徐建新金江善张睿凌励逊郭立君
Owner NO 711 RES INST CHINA SHIPPING HEAVY IND GRP
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