EP3237746B1 - Dispositif d'un système d'injection de carburant et dispositif de liaison étanche métallique - Google Patents

Dispositif d'un système d'injection de carburant et dispositif de liaison étanche métallique Download PDF

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Publication number
EP3237746B1
EP3237746B1 EP15787538.6A EP15787538A EP3237746B1 EP 3237746 B1 EP3237746 B1 EP 3237746B1 EP 15787538 A EP15787538 A EP 15787538A EP 3237746 B1 EP3237746 B1 EP 3237746B1
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EP
European Patent Office
Prior art keywords
partner
connecting partner
sealing
elevation
connection
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
EP15787538.6A
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German (de)
English (en)
Other versions
EP3237746A1 (fr
Inventor
Klaus Lang
Gabor Herke
Norbert SCHIERHOLZ
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 PL15787538T priority Critical patent/PL3237746T3/pl
Publication of EP3237746A1 publication Critical patent/EP3237746A1/fr
Application granted granted Critical
Publication of EP3237746B1 publication Critical patent/EP3237746B1/fr
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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
    • F02M55/004—Joints; Sealings
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/247—Pressure sensors
    • 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
    • F02M2200/9053—Metals

Definitions

  • the invention relates to a metal sealing connection arrangement and a device of a fuel injection system with a metal sealing connection arrangement.
  • the invention relates to the field of fuel injection systems for internal combustion engines.
  • a rail assembly of a fuel injection system is known. This is used in particular for an internal combustion engine of a motor vehicle.
  • a supply pipe for supplying and providing pressurized fuel and a plurality of branches attached to the supply pipe for fluidically connecting the supply pipe to a fuel injector are provided.
  • the supply pipe has an inner contour which is designed to be conical, complementary to an outer contour of an insert section.
  • This conical inner contour which has an inner cross section that widens outward, can also only be formed by the axial pressing in of the insert section. This can ensure that the inner contour of the supply pipe is shaped exactly complementary to the outer contour of the insert section.
  • connection arrangement which is used in particular for fuel injection systems of internal combustion engines is already known.
  • the connection arrangement comprises a first metallic connection partner and a second metallic connection partner, conical or convex / concave sealing surfaces being formed on both connection partners.
  • a sealing contour can additionally be provided on a lower flat sealing surface, which has a circumferential elevation on one of the two connection partners.
  • the metallic sealing connection arrangement according to the invention with the features of claim 1 has the advantage that an improved configuration and functionality are made possible.
  • an improved sealing effect can be achieved with regard to a given material input.
  • the power density can be increased with the same installation space, so that it can be sealed against a higher pressure. Accordingly, the use of materials can be reduced in order to achieve specified requirements.
  • This also enables a cost-effective realization of a sealing function in which a seal against an internal pressure of a fuel-carrying component, in particular a fuel distributor, is possible.
  • the invention is used in fuel injection systems for direct fuel injection, whereby an air-fuel mixture is created within cylinder combustion chambers of an internal combustion engine designed as a gasoline engine.
  • the fuel is injected into the combustion chambers at high pressure.
  • a fuel distributor serves as a
  • Pressure accumulator and for distributing the fuel to several fuel injectors.
  • a sensor is used according to the invention which enables at least one pressure measurement and is preferably designed as a high pressure sensor.
  • a connection partner can be a screw-in socket carrying internal pressure with a sealing function.
  • the pretensioning force cannot be maintained by a screw head but by a sealing cone.
  • a possible screwing in which takes place with a predetermined torque, there is, however, a large scatter in the sealing point characteristics, which is caused in particular by the scatter in the coefficients of friction.
  • connection partner which is for example the base body of a fuel store
  • another connection partner which is for example an attachment
  • This metallic interface can be characterized by the fact that a rotating bolt with thread and conical sealing surface, a standing nut with thread and spherical or toroidal sealing seat, a relative movement of the two connection partners (sealing partners) due to the rotational movement when screwing in the bolt and a plastic deformation of one Connection partner are given due to the biasing force to seal against the fuel.
  • a crowned or toroidal bolt and a conical nut can also be used.
  • the attachment at the sealing point can be a sensor.
  • plastic deformation can only take place on the pressure sensor connector through a suitable material pairing.
  • a targeted setting of a sealing seat width during the initial assembly of the interface can be achieved by an assembly method controlled by the angle of rotation.
  • a provided bolt can be designed to conduct internal pressure.
  • a cone angle on the bolt can be between approximately 60 ° to approximately 120 °.
  • a radius on the nut side can be designed so that it is not completely plastically deformed even with maximum compression.
  • the circumferential elevation is convex and / or toroidal.
  • a toroidal formation is a configuration corresponding to a partial shape of a torus, in particular a convex configuration.
  • the spherical design is usually the partial shape of a torus. This enables a shaping in which the plastic deformation of the second connection partner is limited to the circumferential elevation.
  • an advantageous, circumferential seal can be achieved by specifically setting a sealing contour with an at least approximately predetermined size of the resulting sealing surface via the plastic deformation. It is therefore also advantageous that plastic deformation between the first connection partner and the second connection partner occurs only on the sealing contour of the second connection partner.
  • the circumferential elevation of the second connection partner is designed in such a way that with a maximally adjustable plastic deformation of the circumferential elevation, only a partial plastic deformation of the elevation occurs.
  • the screw connection between the first connection partner and the second connection partner can be designed in such a way that a sealing seat width on the deformed elevation between the first connection partner and the second connection partner can be set via an angle of rotation between the first connection partner and the second connection partner.
  • the extent of the plastic deformation of the sealing contour of the second connection partner is then also predetermined via the predetermined angle of rotation.
  • a conical sealing area is formed by the plastic deformation of the sealing contour of the second connection partner, the conical sealing area being designed with a cone angle which is predetermined by the conical sealing surface of the first connection partner.
  • the first connection partner are designed as a bolt, which has an axial bore
  • the second connection partner as a connector, which has an axial through-bore.
  • the axial bore or the axial through bore can also be configured "axially” only in relation to the sealing area and not necessarily “axially” in relation to the entire component.
  • the The first connection partner is designed as a socket, which has an axial through-hole
  • the second connection partner is designed as a bolt, which has an axial hole.
  • plastic deformation can be set precisely and largely independently of friction within a desired range.
  • Another advantage is that the optimized assembly process allows better use of the thread strength, since the lower spread of the preload enables a smaller distance to the maximum thread tension.
  • a metallically sealing, modified ball / cone connection rotating in the contact area can be implemented after assembly, the sealing contour being convex or toroidal in the contact area, so that the "ball" is modified in a convex shape or as part of a torus is.
  • plastic deformation of the sealing contour takes place when screwing, while the first connection partner is not plastically deformed, in particular in its contact area with the sealing contour.
  • the plastic deformation of the sealing contour of the second connection partner then forms a conical sealing area with the cone angle that is specified by the first connection partner.
  • the required sealing length and preload can be set very precisely via the shape of this conical area. This is done specifically by means of an assembly process controlled by the angle of rotation via the geometric relationship between the thread pitch and the angle of rotation.
  • Fig. 1 shows a device 1 of a fuel injection system with a fuel-carrying component 2 and a connection part 3, wherein a connection arrangement 4 can be produced between a connection partner 5, which is provided on the component 2, and a connection partner 6, which is provided on the connection part 3.
  • the Fig. 1 a state of the connection arrangement 4 before assembly in a partial, schematic sectional view corresponding to a first embodiment, in which the connection partner 6 on the connection part 3 serves as the first connection partner 6 and the connection partner 5 on the component 2 as the second connection partner 6.
  • the component 2 can in particular be designed as a fuel distributor strip 2.
  • the connection part 3 can be designed as a sensor 3.
  • a sensor element 7 can be provided which, in the assembled state, measures, for example, a pressure of the fuel that is located in an axial bore 8 of the connection part 3.
  • the connection part 3 can be designed as a pressure sensor 3.
  • other sensor functions can also be implemented, such as temperature measurement.
  • the pressure of gasoline as a possible fuel can be, for example, 35 MPa.
  • connection partner 6 An external thread 9 is formed on the first connection partner 6. Furthermore, the second connection partner 5 has an internal thread 10 with which the first connection partner 6 can be screwed into the second connection partner 5. About the External thread 9 and internal thread 10 is a screw connection 11.
  • the connection partners 5, 6 can be connected to one another by screwing them with respect to an axis 12 such that the connection partner 6 can be joined in a joining direction 13 in a recess 14 of the connection partner 5.
  • a conical sealing surface 15 is formed on the connection partner 6.
  • a cone angle 16 of the conical sealing surface 15 is selected from a range of approximately 60 ° to approximately 120 °.
  • a partially conical surface 17 is configured on the connection partner 5, which merges into a circumferential elevation 18.
  • a sealing contour 19 is realized on the connection partner 5 by the conical surface 17 and the elevation 18.
  • the elevation 18 revolves around the axis 12.
  • the circumferential elevation 18 faces the conical sealing surface 15 of the connection partner 6.
  • the conical surface 17 of the connection partner 5 also faces the conical sealing surface 15 of the connection partner 6.
  • the sealing contour 19 of the connection partner 5 is designed so that when the first connection partner 6 is screwed to the second connection partner 5, the circumferential elevation 18 of the second connection partner 5 is partially plastically deformed in order to create a metallic seal between the conical sealing surface 15 of the first connection partner 6 and the to form at least partially deformed elevation 18 of the second connection partner 5 in the screwed state. This process is also described below with reference to the Fig. 2 described in more detail.
  • Fig. 2 shows the in Fig. 1 with II designated section of the connecting arrangement 4 during assembly according to the first embodiment of the invention.
  • a state is shown in which the connection partner 6 is just touching the elevation 18 at a contact point 21 or a circumferential contact line 21 due to its rotational angle position 20.
  • an end position can be assumed which is illustrated by a line 22 shown in broken lines.
  • An end position of the connection partner 6 relative to the connection partner 5 can be determined by the line 22, which corresponds to a maximum adjustable plastic deformation of the circumferential elevation 18, with only a partial plastic deformation of the elevation 18 occurring.
  • the elevation 18 is designed to be suitable for this.
  • an effective sealing surface 23 the position of which on the line 22 in the Fig. 2 is illustrated.
  • This effective sealing surface 23 results between the conical sealing surface 15 and the plastically deformed one Elevation 18.
  • the geometric size of the sealing surface 23 can be adjusted at least approximately via the angle of rotation position 20.
  • a metallic seal can thus be formed between the connection partners 5, 6 between the conical sealing surface 15 and the elevation 18, which is partially deformed in the screwed state.
  • the elevation 18 is convex and / or toroidal.
  • the circumferential elevation 18 of the connection partner 5 can have a rounded transition 24 to an axial through hole 25 of the connection partner 5.
  • the rounded transition 24 can be designed with the radius R here.
  • connection partners 5, 6 The material pairing between the connection partners 5, 6 is specified in such a way that only a plastic deformation of the elevation 18 occurs, but no plastic deformation of the conical sealing surface 15.
  • the sealing area 23 given by the effective sealing surface 23 is formed in the assembled state as a conical sealing area 23, which has the same conical angle 16 as the conical sealing surface 15, because the conical angle 16 of the sealing area 23 is then through the conical sealing surface 15 of the first connection partner 6 given.
  • the cone angle 16 of the sealing area 23 is thus also within the range from approximately 60 ° to approximately 120 °.
  • a cone angle 26 of the conical surface 17 of the sealing contour 19 of the connection partner 5 is preferably larger than the cone angle 16.
  • the effective sealing surface (the sealing area) 23 results in a (mean) sealing seat width 27 on the deformed elevation 18 between the connection partners 5, 6.
  • the sealing seat width 27 can also be adjusted via the angle of rotation (the angle of rotation position) 20 between the connection partners 5, 6 .
  • the first connection partner 6 is designed as a bolt 6 which has the axial bore 8.
  • the second connection partner 5 is designed as a connector 5 which has the axial through-hole 25.
  • Fig. 3 shows the in Fig. 1 with II designated section of the connecting arrangement 4 according to a second embodiment.
  • the first connection partner 6 is provided on the component 2, while the second connection partner 5 is provided on the connection part 3.
  • the plastically deformable elevation 18 is thus configured on the connection partner 5 of the connection part 3.
  • the conical sealing surface 15, which preferably does not deform plastically when the connection is formed, is configured on the connection partner 6 of the component 2. Consequently
  • the first connection partner 6 can be configured as a connector that has the axial through-hole 25
  • the second connection partner 5 can be configured as a bolt 5 that has the axial bore 8.

Claims (9)

  1. Dispositif de liaison étanche métallique (4) doté d'un capteur de pression (3) en tant que premier partenaire de liaison métallique (6) et d'une rampe de distribution de carburant (2) en tant que deuxième partenaire de liaison métallique (5), dans lequel les deux partenaires de liaison (5, 6) font partie d'un système d'injection de carburant d'un moteur à combustion interne et dans lequel une surface étanche conique (15) est réalisée sur le premier partenaire de liaison (6), caractérisé en ce que les partenaires de liaison (5, 6) peuvent être reliés directement l'un à l'autre par vissage par rapport à un axe (12),
    dans lequel un contour d'étanchéité (19) associé à la surface étanche conique (15) du premier partenaire de liaison (6) est conçu sur le deuxième partenaire de liaison (5),
    dans lequel le contour d'étanchéité (19) du deuxième partenaire de liaison (5) comporte dans un état initial un relief périphérique (18) entourant l'axe (12) et tourné vers la surface étanche conique (15) du premier partenaire de liaison (6),
    et dans lequel le contour d'étanchéité (19) du deuxième partenaire de liaison (5) est conçu de sorte que lors du vissage du premier partenaire de liaison (6) avec le deuxième partenaire de liaison (5) le relief périphérique (18) du deuxième partenaire de liaison (5) est au moins en partie déformé plastiquement, afin de réaliser un scellement métallique entre la surface étanche conique (15) du premier partenaire de liaison (6) et le relief périphérique (18), au moins en partie déformé plastiquement dans l'état vissé, du deuxième partenaire de liaison (5).
  2. Dispositif de liaison selon la revendication 1,
    caractérisé en ce que
    le relief périphérique (18) est conformé de manière bombée et/ou torique.
  3. Dispositif de liaison selon la revendication 1 ou 2,
    caractérisé en ce que
    une déformation plastique entre le premier partenaire de liaison (6) et le deuxième partenaire de liaison (5) se produit seulement sur le contour (19) du deuxième partenaire de liaison (5).
  4. Dispositif de liaison selon l'une des revendications 1 à 3,
    caractérisé en ce que
    une zone d'étanchéité (23) de forme conique, dotée d'un angle de cône (16) prédéfini par la surface étanche conique (15) du premier partenaire de liaison (6), est créée par la déformation plastique du contour d'étanchéité (19) du deuxième partenaire de liaison (5).
  5. Dispositif de liaison selon l'une des revendications 1 à 4,
    caractérisé en ce que
    un angle de cône (16) de la surface étanche conique (15) est choisi dans un intervalle allant d'environ 60° à environ 120°.
  6. Dispositif de liaison selon l'une des revendications 1 à 5,
    caractérisé en ce que
    le vissage entre le premier partenaire de liaison (6) et le deuxième partenaire de liaison (5) est conçu de telle sorte qu'une largeur de siège d'étanchéité (27) sur le relief déformé (18) entre le premier partenaire de liaison (6) et le deuxième partenaire de liaison (5) est réglable par le biais d'un angle de rotation (20) entre le premier partenaire de liaison (6) et le deuxième partenaire de liaison (5).
  7. Dispositif de liaison selon l'une des revendications 1 à 6,
    caractérisé en ce que
    le relief périphérique (18) du deuxième partenaire de liaison (5) comporte une transition arrondie (24) vers une perforation traversante axiale (25).
  8. Dispositif de liaison selon l'une des revendications 1 à 7,
    caractérisé en ce que
    le relief périphérique (18) du deuxième partenaire de liaison (5) est conçu de telle sorte que lors d'une déformation plastique maximum réglable du relief périphérique (18), seule une déformation plastique partielle du relief (18) du contour d'étanchéité (19) se produit.
  9. Dispositif de liaison selon l'une des revendications 1 à 8,
    caractérisé en ce que
    le premier partenaire de liaison (6) est conçu comme boulon (6) comportant une perforation axiale (8) et le deuxième partenaire de liaison (5) est conçu comme embout (5) comportant une perforation traversante axiale (25) ou en ce que le premier partenaire de liaison (6) est conçu comme boulon (6) comportant une perforation traversante axiale (25) et le deuxième partenaire de liaison (5) est conçu comme embout (5) comportant une perforation axiale (8).
EP15787538.6A 2014-12-22 2015-10-26 Dispositif d'un système d'injection de carburant et dispositif de liaison étanche métallique Active EP3237746B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15787538T PL3237746T3 (pl) 2014-12-22 2015-10-26 Urządzenie układu wtrysku paliwa i uszczelniający metalicznie układ połączeniowy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014226819.2A DE102014226819A1 (de) 2014-12-22 2014-12-22 Einrichtung einer Brennstoffeinspritzanlage und metallische dichtende Verbindungsanordnung
PCT/EP2015/074754 WO2016102104A1 (fr) 2014-12-22 2015-10-26 Dispositif d'un système d'injection de carburant et dispositif de liaison étanche métallique

Publications (2)

Publication Number Publication Date
EP3237746A1 EP3237746A1 (fr) 2017-11-01
EP3237746B1 true EP3237746B1 (fr) 2020-09-30

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Family Applications (1)

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EP15787538.6A Active EP3237746B1 (fr) 2014-12-22 2015-10-26 Dispositif d'un système d'injection de carburant et dispositif de liaison étanche métallique

Country Status (7)

Country Link
EP (1) EP3237746B1 (fr)
KR (1) KR102447585B1 (fr)
CN (1) CN107110087B (fr)
DE (1) DE102014226819A1 (fr)
ES (1) ES2838806T3 (fr)
PL (1) PL3237746T3 (fr)
WO (1) WO2016102104A1 (fr)

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* Cited by examiner, † Cited by third party
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JP7337725B2 (ja) * 2020-02-14 2023-09-04 臼井国際産業株式会社 燃料圧力センサの接続構造

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US20070132236A1 (en) * 2003-11-28 2007-06-14 Vallourec Mannesmann Oil & Gas France Method of producing a hermetic tubular joint comprising local and initial added thickness(es), by means of plastic expansion

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US5489127A (en) * 1993-08-25 1996-02-06 Itt Corporation Mounting apparatus with reduced resistance bead seal
JPH10213043A (ja) * 1997-01-30 1998-08-11 Hino Motors Ltd 高圧燃料パイプの接続構造
US20070132236A1 (en) * 2003-11-28 2007-06-14 Vallourec Mannesmann Oil & Gas France Method of producing a hermetic tubular joint comprising local and initial added thickness(es), by means of plastic expansion

Also Published As

Publication number Publication date
KR102447585B1 (ko) 2022-09-28
PL3237746T3 (pl) 2021-04-06
CN107110087B (zh) 2021-04-27
CN107110087A (zh) 2017-08-29
DE102014226819A1 (de) 2016-06-23
WO2016102104A1 (fr) 2016-06-30
ES2838806T3 (es) 2021-07-02
KR20170095886A (ko) 2017-08-23
EP3237746A1 (fr) 2017-11-01

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