EP2705240B1 - Distributeur de combustible - Google Patents

Distributeur de combustible Download PDF

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Publication number
EP2705240B1
EP2705240B1 EP12709847.3A EP12709847A EP2705240B1 EP 2705240 B1 EP2705240 B1 EP 2705240B1 EP 12709847 A EP12709847 A EP 12709847A EP 2705240 B1 EP2705240 B1 EP 2705240B1
Authority
EP
European Patent Office
Prior art keywords
screw element
fuel
screw
housing part
external thread
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.)
Active
Application number
EP12709847.3A
Other languages
German (de)
English (en)
Other versions
EP2705240A1 (fr
Inventor
Markus Feigl
Holger UHRIG
Julian WEISS
Nikolaus Hautmann
Dietmar Uhlenbrock
Martin GOEHNER
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
Priority to PL12709847T priority Critical patent/PL2705240T3/pl
Publication of EP2705240A1 publication Critical patent/EP2705240A1/fr
Application granted granted Critical
Publication of EP2705240B1 publication Critical patent/EP2705240B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials

Definitions

  • the invention relates to a fuel distributor, in particular a fuel distributor strip for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines.
  • the invention is suitable for fuel injection systems designed as medium-pressure systems.
  • Fuel direct injection fuel rail direct injection fuel injection systems which operate under high pressure and are used for motor vehicles, may use steel or aluminum as the construction material.
  • fuel distribution rails for fuel injection systems with intake manifold injection however, thin-walled steel pipes, plastic pipes or optionally also aluminum pipes can be used.
  • high pressure fuel injection systems operate at about 20 MPa (200 bar) in particular, the low cost fuel injection systems for low pressure applications typically operate at only 0.3 MPa to 0.5 MPa or 3 to 5 bar.
  • a high pressure port may be attached to the steel main pipe by a brazing process.
  • a plastic pipe In a plastic pipe, however, can be made by a suitable welding process, a connection.
  • the fuel distributor in particular for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines, known, comprising a fuel space enclosed by at least one housing part.
  • the fuel distributor has a screw and a sealing ring, wherein on the housing part a recess is provided into which the screw is screwed, wherein the sealing ring between the screw and the housing part forms a seal and wherein the screw has an external thread.
  • an annular groove is designed which receives the sealing ring. From the installation position, the sealing ring rushes into the external thread of the screw element, so that the annular groove is arranged between the external thread of the screw element and an end of the screw element facing the fuel chamber on the screw element.
  • the metallic housing part has an internal thread, which cooperates with the external thread of the screw to a fixed connection when screwing the screw.
  • the fuel distributor according to the invention with the features of claim 1 has the advantage that a connection suitable for medium pressure, in particular for a connection or closure, can be created with comparatively low production costs.
  • the housing part is made of plastic, in particular as a plastic injection molded part.
  • plastic in particular as a plastic injection molded part.
  • the annular groove is advantageous for the annular groove to be arranged between the external thread of the screw element and an end of the screw element facing the fuel chamber on the screw element. It is advantageous that the sealing ring leads the external thread of the screw.
  • the sealing ring seals the region of the external thread of the screw element with respect to the fuel chamber. Chips and other impurities in the area of the external thread can thus not get further inward, that is to say into the fuel space. In addition, these chips and possibly other impurities can not escape to the outside. Thus, existing contaminants remain trapped in the area of the external thread. Impairment of the functionality of the fuel injection system during operation are thereby avoided from the outset.
  • the screw element is configured as a connection element with a connection piece and a through hole leading from the connection piece into the fuel space.
  • a suitable connection for a medium pressure can be realized.
  • a fuel line may be mounted to lead into the fuel space of the fuel manifold under a certain pressure fuel.
  • the connection can be realized in an advantageous manner by screws, in particular self-tapping screwing.
  • the fuel distributor can be configured as an elongate fuel distributor, wherein a connection element is provided at one end and a closure at the other end.
  • the fuel distributor can optionally also be adapted to different installation conditions.
  • the screw has the external thread and that the annular groove is formed on the screw, which receives the sealing ring.
  • an inner diameter of the annular groove is smaller than a threaded inner diameter of the external thread of the screw. This makes it possible that the sealing ring is not loaded when screwing and thus not damaged.
  • the seat of the sealing ring on a smaller diameter is additionally advantageous, as a result of the hydraulically effective diameter smaller and thus the forces are lower.
  • the external thread of the screw has a conical thread form with a steeper angle than a cylindrical or conical shape of the recess of the housing part. Due to the conical thread shape, which has a steeper angle than, for example, a Entformschräge of a plastic injection molding, which forms the housing part, the first thread is formed less in the plastic component than the last thread. Thus arises at the first thread of the screw, which is a possible predetermined breaking point of the preferably tubular housing part, a smaller notch with the advantage of high strength of the housing part, in particular of the tubular housing part, and in the last threads quite a noticeable transmitted load occurs. As a result, the screw can be configured optimally short, so that the cost of materials is reduced and a required space is small.
  • longitudinal ribs or transverse ribs are configured on the housing part in a longitudinal direction and / or transverse direction to an axis of the screw element.
  • the stability of the housing part made of plastic can be improved.
  • the wall thickness is limited. It is advantageous that, at least in the region of the screw element, a length of the longitudinal ribs or a spacing of the transverse ribs from one another is greater than a threaded length of the external thread of the screw element screwed into the housing part. As a result, the force can be transmitted beyond the notch of the first thread on the unnotched, higher-strength region of the housing part.
  • Fig. 1 shows a first embodiment of a fuel distributor 1 of the invention in a partial, schematic sectional view.
  • the fuel distributor 1 can in this case be configured in particular in the form of a fuel distributor strip 1.
  • the fuel distributor 1 is particularly suitable for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines.
  • the fuel distributor 1 is suitable for a medium-pressure system.
  • the mean pressure for such a medium-pressure system can be in the range of 3 MPa to 10 MPa or 30 bar to 100 bar.
  • the mean pressure may be in the range of 5 MPa to 7 MPa or 50 bar to 70 bar.
  • the fuel distributor 1 according to the invention is also suitable for other applications.
  • the fuel distributor 1 has at least one housing part 2, which encloses a fuel space 3.
  • the housing part 2 may form the housing 2 of the fuel distributor 1. However, the housing may also be formed by a plurality of housing parts 2.
  • the housing part 2 has a recess 4, on which an internal thread 5 is configured.
  • a screw 6 which has an external thread 7.
  • the screw 6 is screwed with its external thread 7 in the recess 4 with the internal thread 5.
  • the screw element 6 has a connection piece 8 and a through bore 9 leading from the connection piece 8 into the fuel space 3.
  • an external thread 10 and a cone 11 can be configured on the connecting piece 8.
  • the connection piece 8 can in this case be designed in accordance with a high-pressure connection in order, for example, to allow the connection of a fuel line. Fuel can be fed from a pump into the fuel chamber 3 of the fuel distributor 1 via the fuel line.
  • a screw plate 12 is also provided, which rests in the screwed state on an end face 13 of the housing part 2 and limits the screwing of the screw 6 into the recess 4 of the housing part 2.
  • the screw 6 is designed as a connection element 6.
  • the screw 6 can also be configured as a closure. This eliminates the through hole 9.
  • the connection piece 8 can be omitted.
  • the fuel distributor 1 has a sealing ring 14.
  • the sealing ring 14 forms a seal between the screw element 6 and the housing part 2. As a result, the fuel chamber 3 is sealed in the region of the screw 6 relative to the environment.
  • the sealing ring 14 is preferably configured in the initial state as an O-ring 14 with approximately circular profile.
  • the sealing ring 14 is preferably fuel-resistant, in particular gasoline resistant, designed.
  • the sealing ring 14 is low temperature resistant, preferably to -30 ° C or even at lower temperatures resistant configured.
  • the screw 6 has an annular groove 15 which receives the sealing ring 14.
  • An inner diameter 16 of the annular groove 15 is predetermined smaller than a threaded inner diameter 17 of the external thread 7 of the screw 6.
  • the annular groove 15 is disposed between the external thread 7 of the screw 6 and a fuel chamber 3 facing the end 18 of the screw 6.
  • the sealing ring 14 is therefore first moved along a wall of the recess 4.
  • the cutting of the internal thread 5 of the recess 4 is preferably carried out by self-tapping and self-tapping screwing the screw 6.
  • the sealing ring 14 is therefore moved along a smooth wall, so that it is not actuated.
  • the external thread 10 cuts into the wall of the recess 4, so that the internal thread 5 of the recess 4 is configured.
  • the sealing ring 14 leads the external thread 7 of the screw 6 before.
  • a transverse bore 20 may be provided, which is provided for example between the sealing ring 14 and the external thread 7 of the screwed screw 6 on the housing part 2.
  • the external thread 7 of the screw 6 preferably has a conical thread shape, which tapers in a direction 21 to the fuel chamber 3 out.
  • the recess 4 of the housing part 2 may also have a conical shape.
  • the conical thread form of the external thread 7 of the screw 6 is designed with a steeper angle than a cylindrical or conical shape of the recess 4 of the housing part 2.
  • the sealing ring 14 after assembly has a defined position, in particular with respect to the transverse bore 20.
  • Fig. 2 shows a fuel distributor 1 according to a second embodiment of the invention in a partial, schematic representation.
  • the housing part 2 is formed here as a plastic injection molding.
  • the wall thickness in such a plastic injection molding (plastic injection molded part) 2 is limited.
  • longitudinal ribs 22, 23, 24 and transverse ribs 25, 26 are configured on the housing part 2.
  • the longitudinal ribs 22 to 24 can in this case as axial Huaweirippen 22 to 24 serve.
  • To simplify the illustration are in the Fig. 2 only the ribs 22 to 26 marked.
  • a length 27 of the longitudinal ribs 22 to 24 or a distance 27 of the transverse ribs 25, 26 from each other is greater than a thread length 28 (FIG. Fig. 1 ) of the screwed into the housing part 2 external thread 7 of the screw 6.
  • the force is transmitted beyond the notch of the first thread addition to the reverse, higher-strength region of the screw 6.
  • the housing part 2 is made of plastic, created. The screwing of the screw 6 can in this case via a suitable drive 29, which is designed on the screw 6, take place.
  • the longitudinal ribs 22 to 24 are configured in a longitudinal direction 21 with respect to an axis 31 of the screw element 6.
  • the transverse ribs 25, 26 are configured in a transverse direction 30 with respect to the axis 31 of the screw element 6.

Landscapes

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

Claims (7)

  1. Distributeur de combustible (1), en particulier pour des installations d'injection de combustible de moteurs à combustion interne à compression de mélange et allumage par étincelle, comprenant une chambre de combustion (3) entourée par au moins une partie de boîtier (2), au moins un élément de vis (6) et au moins une bague d'étanchéité (14), un évidement (4) étant prévu au niveau de la partie de boîtier (2), dans lequel est vissé l'élément de vis (6), la bague d'étanchéité (14) constituant un joint d'étanchéité entre l'élément de vis (6) et la partie de boîtier (2), l'élément de vis (6) présentant un filetage extérieur (7), une rainure annulaire (15) étant réalisée au niveau de l'élément de vis (6), laquelle reçoit la bague d'étanchéité (14), et la bague d'étanchéité (14) étant en avant du filetage extérieur (7) de l'élément de vis (6) de telle sorte que la rainure annulaire (15) soit disposée entre le filetage extérieur (7) de l'élément de vis (6) et une extrémité (18) de l'élément de vis (6) tournée vers la chambre de combustion (3) au niveau de l'élément de vis (6),
    caractérisé en ce que
    la partie de boîtier (2) est constituée de plastique, en particulier est réalisée sous forme de pièce moulée par injection de plastique de telle sorte que les copeaux formés lors d'un vissage auto-rainurant et auto-taraudant de l'élément de vis (6) ne parviennent pas dans la chambre de combustion (3).
  2. Distributeur de combustible selon la revendication 1,
    caractérisé en ce que
    l'élément de vis (6) est réalisé sous forme d'élément de raccordement (6) avec une pièce de raccordement (8) et un alésage traversant (9) conduisant depuis la pièce de raccordement (8) jusque dans la chambre de combustion (3).
  3. Distributeur de combustible selon la revendication 1 ou 2,
    caractérisé en ce
    qu'au moins un élément de vis (6) est réalisé sous forme de fermeture (6).
  4. Distributeur de combustible selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce
    qu'un diamètre intérieur (16) de la rainure annulaire (15) est inférieur à un diamètre intérieur de filetage (17) du filetage extérieur (7) de l'élément de vis (6).
  5. Distributeur de combustible selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    le filetage extérieur (7) de l'élément de vis (6) présente une forme de filetage conique avec un angle plus aigu qu'une forme cylindrique ou conique de l'évidement (4) de la partie de boîtier (2).
  6. Distributeur de combustible selon la revendication 1,
    caractérisé en ce que
    des rainures longitudinales (22 - 24), respectivement des nervures transversales (25, 26), sont réalisées au niveau de la partie de boîtier (2) dans une direction longitudinale (21) et/ou dans une direction transversale (30) par rapport à un axe (31) de l'élément de vis (6).
  7. Distributeur de combustible selon la revendication 6,
    caractérisé en ce
    qu'au moins dans la région de l'élément de vis (6), une longueur (27) des nervures longitudinales (22 - 24), respectivement une distance (27) des nervures transversales (25, 26), les unes par rapport aux autres est supérieure à une longueur de filetage (28) du filetage extérieur (7) de l'élément de vis (6) vissé dans la partie de boîtier (2).
EP12709847.3A 2011-05-02 2012-03-15 Distributeur de combustible Active EP2705240B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12709847T PL2705240T3 (pl) 2011-05-02 2012-03-15 Rozdzielacz paliwa

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011075059A DE102011075059A1 (de) 2011-05-02 2011-05-02 Brennstoffverteiler
PCT/EP2012/054516 WO2012150073A1 (fr) 2011-05-02 2012-03-15 Distributeur de combustible

Publications (2)

Publication Number Publication Date
EP2705240A1 EP2705240A1 (fr) 2014-03-12
EP2705240B1 true EP2705240B1 (fr) 2017-05-10

Family

ID=45872939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12709847.3A Active EP2705240B1 (fr) 2011-05-02 2012-03-15 Distributeur de combustible

Country Status (6)

Country Link
EP (1) EP2705240B1 (fr)
CN (1) CN103502624B (fr)
DE (1) DE102011075059A1 (fr)
PL (1) PL2705240T3 (fr)
RU (1) RU2601012C2 (fr)
WO (1) WO2012150073A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6546771B2 (ja) * 2015-04-15 2019-07-17 臼井国際産業株式会社 ガソリン直噴レール

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19756102A1 (de) * 1997-12-17 1999-06-24 Bosch Gmbh Robert Montagevorrichtung zum Montieren von Brennstoffeinspritzventilen
DE19853090A1 (de) * 1998-11-18 2000-05-25 Bosch Gmbh Robert Brennstoffeinspritzanlage
DE19932699B4 (de) * 1999-07-15 2005-03-17 Itw Henschel Gmbh Kraftstoffverteilerleiste für einen Einspritz-Ottomotor
GB2399392A (en) * 2003-03-13 2004-09-15 Visteon Global Tech Inc I.c. engine moulded fuel rail with crash-resistant protecting structure
JP4438450B2 (ja) * 2003-04-07 2010-03-24 株式会社デンソー 配管継手装置およびその組付方法
DE102006020692A1 (de) * 2006-05-04 2007-11-08 Robert Bosch Gmbh Druckregelventil mit Notfahr- und Belüftungsfunktion
CN100557227C (zh) * 2007-11-27 2009-11-04 无锡威孚高科技股份有限公司 用于高压共轨系统的组合式轨
DE102008017151B3 (de) * 2008-04-03 2009-08-27 Continental Automotive Gmbh Kraftstoff-Einspritzsystem für eine Brennkraftmaschine
CN201786519U (zh) * 2010-09-20 2011-04-06 合肥恒信汽车发动机部件制造有限公司 一种塑料燃油分配器

Also Published As

Publication number Publication date
EP2705240A1 (fr) 2014-03-12
RU2601012C2 (ru) 2016-10-27
PL2705240T3 (pl) 2017-10-31
RU2013153134A (ru) 2015-06-10
CN103502624B (zh) 2017-06-09
WO2012150073A1 (fr) 2012-11-08
CN103502624A (zh) 2014-01-08
DE102011075059A1 (de) 2012-11-08

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