WO2007048804A1 - Fuel injection nozzle with a conical fuel channel - Google Patents

Fuel injection nozzle with a conical fuel channel Download PDF

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Publication number
WO2007048804A1
WO2007048804A1 PCT/EP2006/067759 EP2006067759W WO2007048804A1 WO 2007048804 A1 WO2007048804 A1 WO 2007048804A1 EP 2006067759 W EP2006067759 W EP 2006067759W WO 2007048804 A1 WO2007048804 A1 WO 2007048804A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
channel
joining
section
injector
Prior art date
Application number
PCT/EP2006/067759
Other languages
French (fr)
Inventor
Hasiman Ueskuedar
Ozan Alcicek
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2007048804A1 publication Critical patent/WO2007048804A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • This invention concerns a fuel injection nozzle comprising a conical fuel channel with circular cross-section of that portion of the fuel channel from its entry into the injector body up to a groove around the injector needle within the injector element contained in the fuel injection systems having a precise mechanical structure as commonly used in the internal combustion engines.
  • the basic function of high pressure injection systems used in internal combustion engines is to inject fuel through an injection nozzle to create a proper air/fuel mixture in a manner to provide full combustion in the combustion chamber within the operating range of the engine; in other words, depending on the rotation speed of and the power drawn from the engine.
  • the formation of a good air/fuel mixture in a manner to ensure full combustion gradually becomes of greater importance with respect to the emissions resulting from combustion as well as with the efficiency.
  • substantial developments have been achieved in fuel injection systems. Particularly depending on the developments achieved for fuel pumps, the fuel injection pressures are gradually increased, which, in turn, ensures that the fuel injected into the cylinder under high pressure be broken into smaller droplets and form a mixture with air more quickly.
  • the body of an injector nozzle is manufactured as a single piece, and the fuel channel with circular cross-section starting from the top of the injector nozzle body has been directed toward a ring-shaped fuel channel provided between the inner surface of injector body and the injector needle in an angled manner relative to injector axis.
  • the joining corner has a sharp-edged and thin cross-sectional structure.
  • the said sharp-edged and thin cross-sectional corner forms the most critical area with respect to stress build-up under high pressure.
  • the aforesaid thin cross-section is an area that is most likely to be broken in the ordinary course of time due to fatigue failure under the influence of the repetitive pressure changes.
  • This invention concerns a structure that ensures enlargement of the joining angle of a sharp-edged corner formed in that section of the fuel channel with circular cross- section opening to the pressure chamber, which constitutes the most critical area with respect to fatigue strength.
  • the injector body is manufactured in single piece, accommodating the volumes necessary for fuel channels, injector needle and other components.
  • Fuel enters the injector through a fuel channel with circular cross-section starting from the top of the injector body.
  • the groove cut for injector needle on the central axis and the entry of the said fuel channel are located as off-set from the central axis next to it.
  • the fuel channel has been directed toward a ring-shaped fuel channel provided between the inner surface of injector body and the injector needle in an angled manner relative to injector axis.
  • the joining corner has a sharp-edged and thin cross-sectional structure.
  • the fuel channel being the subject matter of this invention has a circular cross-section; however, it has a structure which gradually becomes broader when running from top of the injector body until it reaches the pressure chamber located on top of the ring-shaped fuel channel.
  • the fuel intake channel is in conical shape from the injector top to the pressure chamber.
  • the expanded fuel channel (i.e. the enlarged diameter) at the joining cross-section of the fuel intake channel into the pressure chamber ensures enlargement of the joining angle of the sharp-edged corner.
  • the channel wall at the joining cross-section which constitutes the most critical area with respect to fatigue strength would have a broader structure, which, in turn, ensures occurrence of less stress build-up on the channel wall at the joining cross-section under the influence of high fuel pressure.
  • the fuel pressure can be increased with no breakage at the critical cross-section, while the injector life becomes longer.
  • Figure 1 Cross sectional view of an injection nozzle body as it is known from prior art.
  • Figure 2 Cross sectional view of an injector body according to the invention having a conical fuel intake channel.
  • Figure 3 Cross sectional view of an injector body having conical fuel intake channel and a zoomed view of the joining angle of sharp-edged corner at the joining cross-section of fuel intake channel into the pressure chamber.
  • Figure 1 and Figure 2 comparatively show a cross sectional view of two injector bodies 1, 2, namely the one used today shown in Figure 1 and the other one having conical fuel intake channel shown in Figure 2.
  • the channels 3,4 in which the respective injector needles 40 (only shown in Figure 1) are located in an injector being the subject matter of the invention ( Figure 2) and in an injector body used today ( Figure 1) as well as the respective pressure chambers 5, 6 and injection holes 9, 10 located in the respective nozzles 7, 8 are of very similar structure.
  • entry of fuel is ensured through a cylindrical fuel channel 12 starting from the top 11 of the injector body 1.
  • the groove 13 cut for injector needle on the central axis and the entry 14 of the said fuel channel are located as off-set from the central axis next to it.
  • the fuel channel 12 has been directed toward a ring-shaped fuel channel 4 provided between the inner surface of injector body 1 and the injector needle in an angled manner relative to injector axis.
  • the joining 15 of the channel with circular cross-section 12 into the section so-called pressure chamber 6 located on top of the ring-shaped fuel channel 4 provided between the inner surface of injector body 1 and the injector needle is in an acute angle, the joining corner 16 has a sharp-edged and thin cross-sectional structure.
  • the fuel intake channel 17 has a circular cross-section; however, it has a structure which gradually expands when running from top 18 of the injector body until it reaches the pressure chamber 5 located on top 3 of the ring- shaped fuel channel.
  • the diameter 19 of intake cross-section of the fuel intake channel 17 from the top 18 of injector body 18 is smaller than the diameter 21 of its joining cross-section 20 with the pressure chamber 5.
  • the diameter of the fuel intake channel 17 linearly and continuously increases 21 from the entry section 19 to the joining cross-section 20 into the pressure chamber 5 and thus a conical-shaped channel 17 is obtained.
  • FIG. 3 At the lower part in Figure 3, the sectional view of an injector body 2 having a conical fuel intake channel 17 is shown.
  • the section 20 where the conical fuel intake channel 17 shown in a rectangular frame 22 on the sectional view of the injector body 2 at the bottom part in Figure 2 is joined with the pressure chamber 5 is shown as a zoomed view in a rectangular frame 23 at the lower part of the figure, comparatively with the structure of an injector used today.
  • the joining corner 16 at the joining cross-section 15 of a cylindrical fuel intake channel with circular cross-section 12 with the pressure chamber 6 in today's injector bodies 1 and the joining corner 29 at the joining cross-section 20 of a conical fuel intake channel 12 with the pressure chamber 5 in an injector body 2 being the subject matter of the invention explained herein, which can only be shown as a position in Figure 1, are shown in a rectangular frame 23.

Abstract

This invention concerns a fuel injection nozzle that ensures enlargement of the joining angle (30) of a sharp-edged corner (29) formed in that section of the fuel intake channel (17) opening to the pressure chamber (5), which constitutes the most critical area with respect to fatigue strength, in high pressure fuel injection systems used in the internal combustion engines. As the fuel intake channel (17) starts with a smaller diameter (19) on top (18) of the injector body, reaching a larger diameter (21) at the 15 joining cross-section (20) with the pressure chamber (5), the angle (30) at the joining corner (29) becomes greater than the angle (31) at the joining corner (16) of a cylindrical fuel intake channel (12) with the pressure chamber (6) in a usual injector body (1), which, in turn, ensures that a less vulnerable joining corner (16,29) with a wider angle (30,31) and reduced sharpness be obtained relative to a cylindrical fuel intake channel (12) in today's application. Thus, it will be ensured that a less stress build-up occur at the joining corner (29) of the conical fuel channel (17) with the pressure chamber (5) under the influence of high fuel pressure and hence it will be possible to increase the injector life without occurrence of any breakage at the critical cross-section.

Description

FUEL INJECTION NOZZLE WITH A CONICAL FUEL CHANNEL
This invention concerns a fuel injection nozzle comprising a conical fuel channel with circular cross-section of that portion of the fuel channel from its entry into the injector body up to a groove around the injector needle within the injector element contained in the fuel injection systems having a precise mechanical structure as commonly used in the internal combustion engines.
The basic function of high pressure injection systems used in internal combustion engines is to inject fuel through an injection nozzle to create a proper air/fuel mixture in a manner to provide full combustion in the combustion chamber within the operating range of the engine; in other words, depending on the rotation speed of and the power drawn from the engine. As the legal restrictions on exhaust gas emissions of internal combustion engines have been narrowed, the formation of a good air/fuel mixture in a manner to ensure full combustion gradually becomes of greater importance with respect to the emissions resulting from combustion as well as with the efficiency. For the aforesaid reasons, in order to create a good mixture in the cylinder and to obtain proper conditions for full combustion, substantial developments have been achieved in fuel injection systems. Particularly depending on the developments achieved for fuel pumps, the fuel injection pressures are gradually increased, which, in turn, ensures that the fuel injected into the cylinder under high pressure be broken into smaller droplets and form a mixture with air more quickly.
However, increasing the fuel pressure causes problems on a precisely-structured injection system with respect to strength and lifecycle. Particularly in the channel structures with thin walls and sharp corners provided in the injector in a fuel injection system, substantial stress build-ups occur under higher pressure. The areas where such stress build-ups occur lose their strength over time and are broken, causing the fuel injection system to be unable to perform its function. Hence, in order to prevent such excessive stress build-up in the fuel channels of an injector system under high pressure, any sharp-cornered and very thin-walled designs are tried to be avoided. In today's applications, the body of an injector nozzle is manufactured as a single piece, and the fuel channel with circular cross-section starting from the top of the injector nozzle body has been directed toward a ring-shaped fuel channel provided between the inner surface of injector body and the injector needle in an angled manner relative to injector axis. As the joining of the channel with circular cross-section into the so-called pressure chamber located on top of the ring-shaped fuel channel provided between the inner surface of injector body and the injector needle is in an acute angle, the joining corner has a sharp-edged and thin cross-sectional structure. The said sharp-edged and thin cross-sectional corner forms the most critical area with respect to stress build-up under high pressure. Hence the aforesaid thin cross-section is an area that is most likely to be broken in the ordinary course of time due to fatigue failure under the influence of the repetitive pressure changes.
This invention concerns a structure that ensures enlargement of the joining angle of a sharp-edged corner formed in that section of the fuel channel with circular cross- section opening to the pressure chamber, which constitutes the most critical area with respect to fatigue strength.
As mentioned above, in today's applications, the injector body is manufactured in single piece, accommodating the volumes necessary for fuel channels, injector needle and other components. Fuel enters the injector through a fuel channel with circular cross-section starting from the top of the injector body. When the injector is viewed from top, the groove cut for injector needle on the central axis and the entry of the said fuel channel are located as off-set from the central axis next to it. Whereas, when the injector cross-section is viewed from side, the fuel channel has been directed toward a ring-shaped fuel channel provided between the inner surface of injector body and the injector needle in an angled manner relative to injector axis. As the joining of the channel with circular cross-section into the section so-called pressure chamber located on top of the ring-shaped fuel channel provided between the inner surface of injector body and the injector needle is in an acute angle, the joining corner has a sharp-edged and thin cross-sectional structure.
As mentioned above, the fuel channel being the subject matter of this invention has a circular cross-section; however, it has a structure which gradually becomes broader when running from top of the injector body until it reaches the pressure chamber located on top of the ring-shaped fuel channel. In other words, the fuel intake channel is in conical shape from the injector top to the pressure chamber. The expanded fuel channel (i.e. the enlarged diameter) at the joining cross-section of the fuel intake channel into the pressure chamber ensures enlargement of the joining angle of the sharp-edged corner. Thus, the channel wall at the joining cross-section which constitutes the most critical area with respect to fatigue strength would have a broader structure, which, in turn, ensures occurrence of less stress build-up on the channel wall at the joining cross-section under the influence of high fuel pressure. Thus the fuel pressure can be increased with no breakage at the critical cross-section, while the injector life becomes longer.
The relevant drawings which explains the invention as follows:
Figure 1: Cross sectional view of an injection nozzle body as it is known from prior art.
Figure 2: Cross sectional view of an injector body according to the invention having a conical fuel intake channel.
Figure 3: Cross sectional view of an injector body having conical fuel intake channel and a zoomed view of the joining angle of sharp-edged corner at the joining cross-section of fuel intake channel into the pressure chamber.
Detailed description
Figure 1 and Figure 2 comparatively show a cross sectional view of two injector bodies 1, 2, namely the one used today shown in Figure 1 and the other one having conical fuel intake channel shown in Figure 2. The channels 3,4 in which the respective injector needles 40 (only shown in Figure 1) are located in an injector being the subject matter of the invention (Figure 2) and in an injector body used today (Figure 1) as well as the respective pressure chambers 5, 6 and injection holes 9, 10 located in the respective nozzles 7, 8 are of very similar structure. In a commonly used injector type, entry of fuel is ensured through a cylindrical fuel channel 12 starting from the top 11 of the injector body 1. When the injector body 1 is viewed from top 11, the groove 13 cut for injector needle on the central axis and the entry 14 of the said fuel channel are located as off-set from the central axis next to it. Whereas, when the cross-section of the injector body 1 is viewed from side, the fuel channel 12 has been directed toward a ring-shaped fuel channel 4 provided between the inner surface of injector body 1 and the injector needle in an angled manner relative to injector axis. As the joining 15 of the channel with circular cross-section 12 into the section so-called pressure chamber 6 located on top of the ring-shaped fuel channel 4 provided between the inner surface of injector body 1 and the injector needle is in an acute angle, the joining corner 16 has a sharp-edged and thin cross-sectional structure. Whereas, in case of an injector body 2 with a conical fuel channel, the fuel intake channel 17 has a circular cross-section; however, it has a structure which gradually expands when running from top 18 of the injector body until it reaches the pressure chamber 5 located on top 3 of the ring- shaped fuel channel. In other words, the diameter 19 of intake cross-section of the fuel intake channel 17 from the top 18 of injector body 18 is smaller than the diameter 21 of its joining cross-section 20 with the pressure chamber 5. The diameter of the fuel intake channel 17 linearly and continuously increases 21 from the entry section 19 to the joining cross-section 20 into the pressure chamber 5 and thus a conical-shaped channel 17 is obtained.
At the lower part in Figure 3, the sectional view of an injector body 2 having a conical fuel intake channel 17 is shown. The section 20 where the conical fuel intake channel 17 shown in a rectangular frame 22 on the sectional view of the injector body 2 at the bottom part in Figure 2 is joined with the pressure chamber 5 is shown as a zoomed view in a rectangular frame 23 at the lower part of the figure, comparatively with the structure of an injector used today. In a rectangular frame 23 at the upper part of Figure 2, the exterior wall 24 of the respective ring-shaped channels 3,4 in which the injector needle is located, the exterior walls 25,26 of the respective pressure chambers 5,6, the interior wall 27 of the conical fuel intake channel 17 and the interior wall 28 for the fuel intake channel 12 of the injectors used today are shown for both types of injector body 2,1 as zoomed for comparison purposes.
Furthermore, the joining corner 16 at the joining cross-section 15 of a cylindrical fuel intake channel with circular cross-section 12 with the pressure chamber 6 in today's injector bodies 1 and the joining corner 29 at the joining cross-section 20 of a conical fuel intake channel 12 with the pressure chamber 5 in an injector body 2 being the subject matter of the invention explained herein, which can only be shown as a position in Figure 1, are shown in a rectangular frame 23. As the fuel intake channel 17 in an injector body 2 with conical fuel channel is in a circular cross-section, starting with a smaller diameter 19 on top 18 of the injector body and reaching a larger diameter 21 at the joining cross-section 20 with the pressure chamber 5, the angle 30 at the joining corner 29 becomes greater than the angle 31 at the joining corner 16 of a cylindrical fuel intake channel 12 with the pressure chamber 6 in a usual injector body 1. Thus, with a conical fuel intake channel 17 being the subject matter of this invention, a less vulnerable joining corner 16,29 with a wider angle 30,31 and reduced sharpness is obtained relative to a cylindrical fuel intake channel 12 in today's application, which, in turn, ensures the occurrence of a less pressure build-up at the joining corner 29 under high fuel pressure. Thus the fuel pressure could be increased with no breakage at the critical cross-section, while the injector life would become longer.

Claims

1. Fuel injection nozzle for injection of fuel under high pressure into a combustion chamber comprising an injector body (2) with a bore bearing a nozzle needle that interacts with a valve seat for opening and closing a plurality of injection holes (9, 10), and with a ring-shaped fuel channel (3) that is formed between the nozzle needle (40) and the bore to enable a fuel flow towards the injection holes (9, 10), and with a fuel intake channel (12) that is disposed in the nozzle body (2) for providing the ring-shaped fuel channel (3) with fuel, the fuel intake channel (12) exhibiting a round cross section, characterized in that the fuel intake channel (12) has a conical shape that widens towards the ring-shaped fuel channel (3).
2. Fuel injection nozzle according to claim 1, characterized in that the diameter of the fuel intake channel (17) linearly and continuously increases (21) from the entry section (19) to the joining cross-section (20) into the pressure chamber (5) so that a conical-shaped channel (17) is obtained.
PCT/EP2006/067759 2005-10-26 2006-10-25 Fuel injection nozzle with a conical fuel channel WO2007048804A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2005/04275 2005-10-26
TR2005/04275A TR200504275A1 (en) 2005-10-26 2005-10-26 Conical fuel channel injector system.

Publications (1)

Publication Number Publication Date
WO2007048804A1 true WO2007048804A1 (en) 2007-05-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/067759 WO2007048804A1 (en) 2005-10-26 2006-10-25 Fuel injection nozzle with a conical fuel channel

Country Status (2)

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TR (1) TR200504275A1 (en)
WO (1) WO2007048804A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TR200604496A1 (en) * 2006-08-22 2008-03-21 Robert Bosch Gmbh Injector system with double pressure chamber.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4796816A (en) * 1987-09-21 1989-01-10 Gregory Khinchuk Impinging-jet fuel injection nozzle
US6116522A (en) * 1996-04-16 2000-09-12 Motorenfabrik Hatz Gmbh & Co. Kg Fuel injection device
DE10338946A1 (en) * 2003-08-25 2005-03-24 Robert Bosch Gmbh Fuel injection valve for internal combustion engine of vehicle, closes injection openings downstream and upstream and connects pressure- and intermediate chambers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9709678D0 (en) * 1997-05-14 1997-07-02 Lucas Ind Plc Fuel injector
JP3578105B2 (en) * 2001-04-12 2004-10-20 トヨタ自動車株式会社 Fuel injection device
DE10118699A1 (en) * 2001-04-17 2002-10-31 Bosch Gmbh Robert Fuel injection device and fuel system for internal combustion engines, and internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4796816A (en) * 1987-09-21 1989-01-10 Gregory Khinchuk Impinging-jet fuel injection nozzle
US6116522A (en) * 1996-04-16 2000-09-12 Motorenfabrik Hatz Gmbh & Co. Kg Fuel injection device
DE10338946A1 (en) * 2003-08-25 2005-03-24 Robert Bosch Gmbh Fuel injection valve for internal combustion engine of vehicle, closes injection openings downstream and upstream and connects pressure- and intermediate chambers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TR200604496A1 (en) * 2006-08-22 2008-03-21 Robert Bosch Gmbh Injector system with double pressure chamber.

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Publication number Publication date
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