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WO2001075298A1 - Soupape d'injection de carburant pour moteurs thermiques - Google Patents

Soupape d'injection de carburant pour moteurs thermiques Download PDF

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Publication number
WO2001075298A1
WO2001075298A1 PCT/DE2001/001271 DE0101271W WO0175298A1 WO 2001075298 A1 WO2001075298 A1 WO 2001075298A1 DE 0101271 W DE0101271 W DE 0101271W WO 0175298 A1 WO0175298 A1 WO 0175298A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
bore
valve body
section
combustion chamber
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/DE2001/001271
Other languages
German (de)
English (en)
Inventor
Werner Wagner
Wilhelm Eyberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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 WO2001075298A1 publication Critical patent/WO2001075298A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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

Definitions

  • the invention is based on a fuel injection valve for internal combustion engines according to the preamble of claim 1.
  • a fuel injection valve for example from the patent DE 42 05 744 C2.
  • a bore is formed in a valve body, in which a piston-shaped valve member is arranged to be longitudinally displaceable. At least one injection opening is formed at the end of the bore on the combustion chamber side
  • Valve member is opened and closed.
  • the valve member is sealingly guided in the bore in a section facing away from the combustion chamber, tapers towards the combustion chamber with the formation of a pressure shoulder and merges into a stem part.
  • the pressure shoulder is arranged in a pressure chamber which surrounds the valve member and is formed by a radial expansion of the bore.
  • the pressure chamber continues to the combustion chamber as an annular channel surrounding the valve member and is connected to a high-pressure fuel source via an inlet channel running in the valve body.
  • the design of the pressure chamber as a radial extension of the bore is difficult to manufacture in the known fuel injection valve. Since the pressure chamber only over the section of the bore, the sealing section the valve member receives, accessible st, the manufacture of the pressure chamber is complex and expensive. Due to the high fuel pressure with which the fuel flows out of the inlet channel into the pressure chamber, all edges and transitions of the pressure chamber have to be rounded in order to avoid turbulence and sharp notches. Because of the difficult access to the location of the pressure chamber, this is also complex and therefore cost-intensive.
  • valve body consists of two valve body parts, the separating surface of the valve body parts dividing the pressure chamber.
  • each valve body part can be manufactured separately and, since it is now easily accessible, the pressure chamber can be designed simply and inexpensively.
  • the first valve body part is advantageously axially braced against the second valve body part, care being taken to ensure that the bores in the first and second valve body parts are exactly aligned. It is advantageous here to guide the stem part of the valve member near the injection openings in addition to the sealingly guided section of the valve member.
  • valve sealing surface formed on the valve member cooperates optimally with the valve seat, even if the bore in the first and the bore in the second valve body part are not exactly aligned with one another, which will generally be the case due to the manufacturing tolerances. Due to the comparatively long
  • valve member between the additional guidance of the valve stem and the sealingly guided section of the valve member the valve member is flexible enough to allow a slight deviation from the exact alignment of the two guides to compensate without seizing the valve member in the bore.
  • the fuel injection valve according to the invention has the advantage that the bore in the first and second valve body parts can have a different diameter.
  • the diameter of the bore in the valve body part facing the combustion chamber can be made larger than the diameter of the bore in the valve body part facing away from the combustion chamber.
  • FIG. 1 shows a longitudinal section through the fuel injection valve according to the invention.
  • FIG. 1 shows a longitudinal section through a fuel injection valve according to the invention, as is used for injecting fuel into the combustion chamber of an internal combustion engine.
  • a valve body 1 is clamped axially against a valve holding body 5 with a clamping nut 2.
  • the valve body 1 is composed of two valve body parts 101 and 201, the first valve body part 101 facing away from the combustion chamber and the second valve body part 201 facing the combustion chamber, so that the first valve body part 101 is arranged between the valve holding body 5 and the second valve body part 201.
  • the first valve body part 101 has a cylindrical outer contour and rests with its end face facing the combustion chamber against the end face of the second valve body part 201.
  • the outer surface of the second valve body part 201 is stepped Cylinder formed, the outer diameter of the second valve body part 201 is reduced to form the annular shoulder 19 to the combustion chamber hm.
  • a centering bore 32 is formed in the mutually facing end faces of the valve holding body 5 and the first valve body part 101, which run parallel to the longitudinal axis 35 of the valve body 1 and are aligned with the intended mounting position of the valve body parts 101, 201.
  • identical center holes 32 are formed on the mutually facing end faces of the first valve body part 101 and the second valve body part 201.
  • Centering pins 30 are arranged in the centering bores 32 and ensure that the valve holding body 5 and the valve body parts 101 and 201 maintain the intended position with respect to one another. It can also be provided that more than one centering bore 32 is formed on the end faces of the valve body parts 101, 201 or the valve holding body.
  • a bore 6 is formed in the valve body 1, one end of which is closed and faces the combustion chamber.
  • the bore 6 extends through the first valve body part 101 to close to the combustion chamber end of the second valve body part 201, so that a first section 106 of the
  • Bore 6 is formed in the first valve body part 101 and a second section 206 of the bore 6 in the second valve body part 201.
  • a valve seat 22 and at least one injection opening 24 are formed which connect the bore 6 with the combustion chamber of the internal combustion engine combines.
  • a piston-shaped valve member 9 is arranged so as to be longitudinally displaceable, which is sealingly guided by a sealing section 109 in the first section 106 of the bore 6.
  • the valve member 9 tapers to the combustion chamber with formation a pressure shoulder 13 and merges into a shaft part 209.
  • a valve sealing surface 20 is formed, with which the valve member 9 cooperates with the valve seat 22 for controlling the at least one injection opening 24.
  • the pressure shoulder 13 is arranged in a pressure space 28 which surrounds the valve member 9 and is formed by a radial expansion of the bore 6 and which continues as an annular channel surrounding the stem part 209 of the valve member 9 up to the valve seat 22.
  • the pressure chamber 28 is connected via an inlet channel 26 running in the valve body 1 and the valve holding body 5 to a high-pressure fuel source, not shown in the drawing, and can be filled with fuel under high pressure.
  • the valve member 9 has a radial extension 10 on the shaft part 209, with which the valve member 9 is guided in the first section 106 of the bore 6.
  • 10 recesses 11 are formed on the radial extension.
  • longitudinal grooves or oblique grooves extending obliquely to the longitudinal axis 35 of the valve body 1 are formed on the radial extension 10.
  • the valve member 9 merges away from the combustion chamber into a spring plate 17 which is arranged in a spring chamber 16 formed in the valve holding body 5.
  • the spring 15 is arranged between the spring plate 17 and a spring stop (not shown in the drawing) under prestress and acts on the valve member 9 in the direction of the valve seat 22.
  • the mode of operation of the fuel injection valve is as follows: via the high-pressure fuel source, not shown in the drawing, fuel is introduced into the inlet channel 26, so that a predetermined high level of fuel pressure prevails in the pressure chamber 28 down to the valve seat 22.
  • the pressure of the fuel in the pressure chamber 28 results in a force acting in the axial direction of the valve member 9 on the pressure shoulder 13, which acts on the valve member 9 away from the combustion chamber.
  • a closing force is exerted on the valve member 9 by the valve piston 12, which is greater than the hydraulic force on the pressure shoulder 13, so that the valve member 9 rests with the valve sealing surface 20 on the valve seat 22 and the at least one injection opening 24 against the hole 6 seals.
  • the injection process is initiated in that the hydraulically generated closing force on the valve piston 12 is reduced to such an extent that it is less than the hydraulic force on the pressure shoulder 13 of the valve member 9.
  • the valve member 9 experiences a resulting force which is directed away from the combustion chamber is so that the valve member 9 with the valve sealing surface 20 lifts off the valve seat 22 and opens at least one injection opening 24.
  • the fuel from the pressure chamber 28 is now injected into the combustion chamber of the internal combustion engine via the at least one injection opening 24.
  • the injection is ended by increasing the hydraulically generated closing force on the valve piston 12 to such an extent that the force thereby generated on the valve member 9 is greater than the hydraulic force on the Pressure shoulder 13 and the valve sealing surface 20.
  • the valve member 9 is thereby pressed again with the valve sealing surface 20 against the valve seat 22 and thus closes the at least one injection opening 24.
  • the spring 15 mainly serves to keep the fuel injection valve closed when the internal combustion engine is switched off and thus in the depressurized state in the pressure chamber 28.
  • both valve body parts 101 and 201 can be manufactured separately from one another. It should be ensured here that the sections 106 and 206 of the bore 6 in the installed position of the valve body parts 101 and 201 are exactly aligned with one another.
  • the parting plane of the two valve body parts 101 and 201 divides the pressure chamber 28. This makes it easily possible to carefully round the transitions from the pressure chamber 28 to the bore 6 and the transition from the inlet channel 26 to the pressure chamber 28. On the one hand, this is necessary in order to prevent swirling of the fuel in the area of the pressure chamber 28, which would result in the fuel injector not functioning optimally. On the other hand, rounding avoids sharp
  • valve member 9 near the valve seat 22 through the radial extension 10 in the second section 206 of the bore 6 leads, there is an exactly symmetrical position of the valve seal - flat 20 with respect to the valve seat 22.
  • all the injection openings 24 are opened uniformly during the opening stroke movement of the valve member 9 and the injection of the fuel m into the combustion chamber of the internal combustion engine takes place correspondingly uniformly through all injection openings 24. This ensures optimal combustion and the lowest possible exhaust gas values.
  • valve body 1 is connected to a valve holding body 5, in which the closing force is not exerted hydraulically on the valve member 9 via a valve piston 12, but is generated by one or more springs.
  • the control of the injection process does not take place via a change in the closing force on the valve member 9, but with an at least approximately constant closing force via a pressure change in the pressure chamber 28.
  • the valve member 9 opens the at least one injection opening in the manner described above 24, when the fuel pressure drops, it is pressed against the valve seat 22 again by the closing force and the injection openings 24 are closed.
  • valve member 9 Due to the additional second guidance of the valve member 9 m of the bore 6 and the large distance between the sealingly guided section of the valve member 9 to this additional guide, the valve member 9 is flexible enough to compensate for a slight roofing of the two sections 106 and 206 of the bore 6, without causing the valve member 9 to seize in the bore 6.
  • valve member 9 As an alternative to the additional guidance of the valve member 9 shown in the drawing, provision can also be made for the guidance not to be formed by a radial widening 10 of the valve member 9, but by a radial narrowing of the bore 6.
  • the guidance not to be formed by a radial widening 10 of the valve member 9, but by a radial narrowing of the bore 6.
  • precautions must be taken that: allow an inflow of fuel from the pressure chamber 28 to the injection openings 24, for example recesses on the radial constriction or on the valve member 9 in the region of the radial constriction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

La présente invention concerne une soupape d'injection de carburant comprenant un corps de soupape (1) dans lequel est pratiqué un alésage (6) qui est refermé à l'extrémité côté chambre de combustion où il forme un siège de soupape (22). Dans l'alésage (6) se trouve un élément de soupape (9) de type piston qui s'effile en direction de la chambre de combustion par formation d'un épaulement de compression (13), et qui, avec une surface étanche de soupape (20) formée à l'extrémité côté chambre de combustion, interagit avec le siège de soupape (22). L'épaulement de compression (13) se trouve à l'intérieur d'une chambre de compression (28) formée dans le corps de soupape (1), ladite chambre de compression pouvant être remplie de carburant haute pression. L'élément de soupape (9) est guidé dans l'alésage (6) dans une première section (106) opposée à la chambre de combustion, et présente en direction du siège de soupape (22), un second système de guidage formé par une extension radiale (10), ledit second système de guidage se trouvant dans une seconde section (206) de l'alésage. Le corps de soupape (1) est formé de deux sections, la première section (106) de l'alésage (6) se trouvant dans la première partie de corps de soupape (101), et la seconde section (206) de l'alésage (6) se trouvant dans la seconde partie de corps de soupape (201), de sorte que les deux parties de corps de soupape (101, 201) peuvent être réalisés séparément et que la chambre de compression (28) peut être réalisée plus simplement, et donc de façon plus économique.
PCT/DE2001/001271 2000-04-01 2001-03-29 Soupape d'injection de carburant pour moteurs thermiques Ceased WO2001075298A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000116426 DE10016426A1 (de) 2000-04-01 2000-04-01 Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10016426.9 2000-04-01

Publications (1)

Publication Number Publication Date
WO2001075298A1 true WO2001075298A1 (fr) 2001-10-11

Family

ID=7637374

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/001271 Ceased WO2001075298A1 (fr) 2000-04-01 2001-03-29 Soupape d'injection de carburant pour moteurs thermiques

Country Status (2)

Country Link
DE (1) DE10016426A1 (fr)
WO (1) WO2001075298A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4205744A1 (de) * 1991-02-26 1992-08-27 Nissan Motor Brennkraftmaschinen-brennstoffeinspritzduese
US5607106A (en) * 1994-08-10 1997-03-04 Cummins Engine Company Low inertia, wear-resistant valve for engine fuel injection systems
WO2001014736A1 (fr) * 1999-08-25 2001-03-01 Caterpillar Inc. Arret en ceramique pour injecteur de combustible

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4205744A1 (de) * 1991-02-26 1992-08-27 Nissan Motor Brennkraftmaschinen-brennstoffeinspritzduese
DE4205744C2 (de) 1991-02-26 1996-09-19 Nissan Motor Brennkraftmaschinen-Brennstoffeinspritzdüse
US5607106A (en) * 1994-08-10 1997-03-04 Cummins Engine Company Low inertia, wear-resistant valve for engine fuel injection systems
WO2001014736A1 (fr) * 1999-08-25 2001-03-01 Caterpillar Inc. Arret en ceramique pour injecteur de combustible

Also Published As

Publication number Publication date
DE10016426A1 (de) 2001-10-11

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