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Injectors for Diesel Engines

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

Active Publication Date: 2017-11-17
中国船舶集团有限公司第七一一研究所
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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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  • Injectors for Diesel Engines
  • Injectors for Diesel Engines
  • Injectors for Diesel Engines

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 the needle valve couple. The needle valve 1 is arranged in the needle valve body 2 through precise fit. The annular lower surface of the supporting surface 201 of the body 2 fits with the annular upper surface of the protrusion of the fastening nut 3 to form a matching sealing surface. The oil chamber 4 is arranged between the needle valve 1 and the needle valve body 2 . The plane where the sealing surface formed by the support surface 201 of the needle valve body 2 and the protruding portion 301 of the fastening nut 3 is set as L1, and the plane where the top surface of the oil chamber 4 is located is set as L2. Under the condition that the plane L2 where the top surface of the oil chamber 4 is located is not higher than the plane L1 where the sealing sur...

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 chamber 4 Wait. The connection relationship between the various components is the same as that described in Embodiment 1, and will not be repeated here.

[0047] Unlike Example 1, the combination figure 2 — Figure 4 , In the 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 arranged on the upper surface of the needle valve body 2 and vertically downwards along 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 to the oil chamber 4 , and the other end forms two oil inlet holes 31 on the upper surface of the needle valve body 2 . D...

Embodiment 3

[0059] In this embodiment, the fuel injector provided in this embodiment is similar in 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 holding cavity 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] Unlike Example 1 or 2, the combination figure 2 , The inner side of the needle valve body 2 is provided with a reaming hole 22, and the reaming hole is located at the uppermost end of the mating surface of the needle valve body 2 and the needle valve 1. The radial width (diameter) and axial depth of the reaming hole 22 are designed not to be smaller than the radial deformation of the needle valve body 2 and the needle valve 1 . Specifically, the diameter of the reaming hole 22 is 0.1-3 mm larger than the diameter of the needle valve 1 . The axial depth of the reaming hole 22 is 0.5-8mm. Th...

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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 and adjustable fuel injection pressure, fuel injection timing, flexible control and free adjustment of fuel injection volume, which can effectively reduce diesel engine fuel consumption and emissions and improve power performance. The high-pressure common rail electronically controlled fuel injector is the core key component of the high-pressure common-rail system, and its structural parameters and performance directly affect the response speed, fuel injection rate, and reliability of the entire high-pressure common-rail system. [0003] The existing high-pressure common rail e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/10
Inventor 徐建新金江善张睿凌励逊郭立君
Owner 中国船舶集团有限公司第七一一研究所
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