WO2023232363A1 - Rampe à carburant et son procédé de préparation simple - Google Patents

Rampe à carburant et son procédé de préparation simple Download PDF

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Publication number
WO2023232363A1
WO2023232363A1 PCT/EP2023/061302 EP2023061302W WO2023232363A1 WO 2023232363 A1 WO2023232363 A1 WO 2023232363A1 EP 2023061302 W EP2023061302 W EP 2023061302W WO 2023232363 A1 WO2023232363 A1 WO 2023232363A1
Authority
WO
WIPO (PCT)
Prior art keywords
bore
plug
wedge
tube hole
fuel rail
Prior art date
Application number
PCT/EP2023/061302
Other languages
English (en)
Inventor
Semih BILIR
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
Priority claimed from TR2022/009107 external-priority patent/TR2022009107A2/tr
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2023232363A1 publication Critical patent/WO2023232363A1/fr

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
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/855—Mounting of fuel injection apparatus using clamp elements or fastening means, e.g. bolts or screws

Definitions

  • the present invention relates to fuel rails and methods of preparation thereof.
  • the present invention relates to an improvement in sealing of the forged fuel rails.
  • Fuel rails are used in automotive industry for arranging distribution of fuel into a plurality of fuel injectors in a controlled manner.
  • the fuel provided into a tube is communicated into fuel injectors through injector cups that have a respective inner volume that is in fluid flow communication with the tube hole of such tube.
  • the fluid flow communication can be constituted with a plurality of drilling steps, to form a T-shaped cross bore that connects the injector cup to the tube hole.
  • Such multi-step drilling results in an opening on a front face of the injector cup, and the opening must be properly sealed for avoiding leakage of the fuel therethrough. It is important to arrange an efficient sealing of the opening with minimized costs.
  • Primary object of the present invention is to propose a fuel rail with a simple yet efficient sealing.
  • Another object of the present invention is to propose a low cost and simple solution for sealing of cross bores in fuel rails, in particular, in forged fuel rails.
  • the present application proposes fuel rail that comprises a tube with a tube hole and a plurality of injector cups in fluid flow communication with the tube hole via a respective plurality of T-shaped cross bores that include a first bore and a second bore.
  • the first bore extends from the tube hole towards a front face of a respective injector cup, said front face being distal to the tube hole with regard to a central axis of the first bore.
  • the second bore is arranged to provide fluid flow communication from the first bore to an inner volume of the injector cup.
  • the first bore is provided with a plug at a distal end of the first bore with regard to the tube hole.
  • a distal end of the first bore is provided with a plug housing such that, radial to a plug axis, the plug housing has a greater diameter when compared to a diameter of the first bore.
  • the plug housing is provided with a wedge that is arranged for pushing and biasing the plug towards the tube hole.
  • the plug housing is further provided with a couple of wedge bores for receiving and hosting the wedge across the plug axis.
  • sealing of the first bore can be achieved mechanically, even without necessitating a welding operation.
  • the context proposed in the present application allows a simplified, low-cost process in sealing of the cross bore. Accordingly, a simplified and low-cost fuel rail is rendered available with the teaching of the present application.
  • the wedge can include an inclined side that is arranged for facing the plug and for transferring a gradually increasing a mechanical force applied by the wedge onto the plug towards the first bore during the placement of the wedge at assembling of the fuel rail. This measure enables an easy pre-placement of the wedge to the wedge bores, and the axial mechanical force exerted by the wedge onto the plug is increased gradually.
  • the plug is arranged with a flexible material to be in mechanical contact with the plug housing and/or with the first bore around the plug axis.
  • the flexible material enables the sealing without necessitating a high extent of force to be exerted by the wedge onto the plug.
  • the plug can include a substantially conical centering face, that at least partially extends into the first bore. This measure facilitates the placement and alignment of the plug at assembling the fuel rail.
  • the flexible material can be in the form of a coating, sheet or ring provided on or around the centering face.
  • the flexible material can include rubber.
  • Fig.1 is a perspective view of an exemplary forged fuel rail according to the present application prior to sealing, wherein fuel injectors and sensor are omitted.
  • Fig.2 is perspective view of the exemplary forged fuel rail shown in Fig.l after the sealing, wherein fuel injectors and sensor are omitted.
  • Fig.3 is a side view of the fuel rail shown in Fig.l.
  • Fig.4 is a side view of the fuel rail shown in Fig.2.
  • Fig.5 is the A-A section taken from Fig.3.
  • Fig.6 is the B-B section taken from Fig.4.
  • Fig.7 is the D-D section taken from Fig.4.
  • Fig.8 is the detail E taken from Fig.7.
  • Fig.9a is a top view of an exemplary wedge for use in the fuel rail according to the present application.
  • Fig.9b is a side view of the wedge shown in Fig.9a.
  • Fig.9c is a front view of the wedge shown in Fig.9a.
  • Fig.lOa is perspective view of an exemplary plug for use in the fuel rail according to the present application.
  • Fig.lOb is a side view of the plug shown in Fig.lOa.
  • a fuel rail (1000) can comprise several design elements that include a tube (10) with a tube hole (11) (i.e., an inner volume of the tube 10) along a tube axis (At).
  • the design elements further include a plurality of injector cups (20) in fluid flow communication with the tube hole (11).
  • the injector cups (20) can be considered to be arranged for being coupled with a respective plurality of fuel injectors to be mounted onto the fuel rail (1000).
  • the design elements can be considered to further include the following: a plurality of mounting brackets designated to the respective plurality of the injector cups (20); one or more fuel inlet fittings arranged for fuel supply into the tube hole (11); and one or more sensor fittings (50).
  • a process for formation of the fuel rail (1000) can include brazing or forging.
  • the design elements can be manufactured separately by pre-machining, to be brought together later by brazing.
  • forging can include formation of the design elements from a single piece of metal, by hot pressing to a predetermined shape in a die system.
  • Said die system can include, for instance, a couple of dies for formation of the fuel rail (1000) therebetween.
  • the advantages of forging include minimization of the of material and labor costs.
  • the fluid flow communication between the tube hole (11) and an inner volume (21) of the injector cup (20) can be constituted by bore formation between the tube hole (11) and said inner volume (21) by a drilling step.
  • the drilling step is performed by introduction of a drill bit from the inner volume (21) towards the tube hole (11).
  • the drilling step bears the risk of being subjected to a side-contact (that is, a mechanical contact by the injector cup (20), oblique to a rotational axis of the drill bit): if the tube hole (11) and the inner volume (21) of the injector cup (20) are offset with respect to each other (in other words, if respective axial projections of the tube hole (11) and said inner volume (21) do not at least partially overlap); and the inner volume (21) of the injector cup (20) have a geometry (e.g., a length/diameter value and/or depth along an injector cup axis (Ac)) that does not allow the drill to aim the tube hole (11) when inserted into the inner volume (21) of the injector cup (20).
  • a side-contact that is, a mechanical contact by the injector cup (20), oblique to a rotational axis of the drill bit
  • the vertical distance (offset) of the tube axis (At) to the injector cup axis (Ac) affects the possibility of one-step formation of the fluid flow communication between the tube hole (11) and the inner volume (21) of the injector cup (20) (See: Fig.6).
  • said fluid flow communication cannot be constituted with a one-step drilling operation without damaging either or both of the injector cup (20) and the drill bit.
  • the drill bit is inevitably subjected to transversal forces due to said mechanical contact.
  • the drill bit loses its functionality and the drilling process is interrupted.
  • the injector cup (20) can undergo a deformation by threaded side surfaces of the drill bit.
  • a first bore (Bl) is drilled to connect the tube hole (11) to a front face (22) (that is, a side of the injector cup (20) distal to the tube hole (11)); a second bore (B2) is drilled to connect the inner volume (21) of the injector cup (20), to the first bore (Bl); thereby achieving a T-shaped cross-bore and a plug (60) is provided to seal the first bore (Bl) at a front face side end thereof (i.e., at a distal end with regard to the tube hole (11)), thus sealing the front face (22).
  • the plug (60) can be fixed by a fixing method that can include press fitting, screwing or welding.
  • the welding can include laser welding or capacitor discharge welding. Laser welding and capacitor discharge welding are highly complex processes that require expensive manufacturing equipment. The present application overcomes these problems by means of the features that constitute the annexed independent claims.
  • sealing of the first bore (Bl) can be achieved mechanically, thus even without necessitating a welding operation.
  • a wedge (70) can be arranged for pushing and biasing the plug (60) towards the tube hole (11).
  • the plug (60) can be placed into a plug housing (61) that has a greater diameter when compared to the diameter of the first bore (Bl); here, said diameters correspond to respective radial widths of the plug housing (61) and first bore (Bl) around a plug axis (Ap).
  • Fig.l shows a perspective view of an exemplary forged fuel rail (1000) according to the present application prior to sealing, wherein fuel injectors and sensor are omitted.
  • Fig.2 shows a sealed state of the exemplary forged fuel rail (1000) shown in Fig.l; that is, after the provision of a plug (60) and wedge (70) within the context of the present application.
  • the plug hole (61) can be provided with a wedge (70) that is arranged for pushing and biasing the plug (60) towards the tube hole (11).
  • the plug hole (61) can be provided with a couple of wedge bores (71) for receiving and hosting the wedge (70) across the plug axis (Ap), at multiple portions of the wedge (70).
  • the wedge bores (71) can be disposed across the plug axis (Ap).
  • the wedge bores (71) can be considered as a couple of openings opposing each other at two sides radial to the plug axis (Ap).
  • the openings can be radially formed around the plug axis (Ap), at an axial distance from the centering face (62) that allows the wedge (70) to axially press the plug (60) towards/into the first bore (Bl), and to keep the plug (60) in mechanical contact with the first bore (Bl) for circumferentially sealing the same.
  • the wedge (70) can include an inclined side (72) arranged for facing the plug (60) and for transferring a gradually increasing a mechanical force applied by the wedge (70) onto the plug (60) towards the first bore (Bl) during the placement of the wedge (70) at assembling of the fuel rail (1000).
  • inclined side (72) distal ends of the wedge (70) have different widths.
  • a first end having the inclined side (72) has a lower width when compared to a second end that is distal to the first end.
  • the first end can be introduced first into the plug housing (61) through the wedge bores (71), and after the first end enters the opposite side of the wedge bores (71), the placement of the wedge (70) orthogonal to the plug axis (Ap) is secured. Then, upon further advancing the position of the wedge (70), the force exerted by the wedge (70) onto the plug (60) gradually increases by means of the inclined side (72).
  • the plug (60) can include a substantially conical centering face (62) arranged for being at least partially introduced into the first bore (Bl) at assembly.
  • the centering face (62) facilitates the alignment of the plug (60) for securing the circumferential sealing of the first bore (Bl).
  • the plug (60) can be provided with a flexible material to be in mechanical contact with the plug housing (61) and/or with the first bore (Bl) around the plug axis (Ap).
  • the presence of the flexible material enables a sufficient extent of sealing with a minimized extent of axial force exerted by the wedge (70) towards the first bore (Bl) (or towards the tube hole 11).
  • the flexible material can be in the form of a coating, sheet or ring provided on or around the centering face (62).
  • An exemplary flexible material for this effect can include rubber. Selection of the flexible material can include measures for avoiding dissolution or swelling of the flexible material in a fuel for which the fuel rail (1000) is intended.
  • the plug (60) and plug housing (61) have cylindrical geometries with respective heights along the central axis of the first bore (Bl), and the height of the plug (60) is smaller than the height of the plug housing (61). This measure allows the formation of the wedge bores (71) and placement of the wedge (70) behind the plug (60) regarding from the first bore (Bl) along the plug axis (Ap). Said central axis of the first bore (Bl) can be considered to correspond to the plug axis (Ap). Reference signs:

Landscapes

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

Abstract

La présente demande propose une rampe à carburant (1000) qui comprend un tube (10) pourvu d'un trou de tube (11) et une pluralité de coupelles d'injecteur (20) en communication d'écoulement de fluide avec le trou de tube (11) par l'intermédiaire d'une pluralité respective d'orifices transversaux en T qui comprennent un premier orifice (B1) et un second orifice (B2). Le premier orifice (B1) s'étend à partir du trou de tube (11) vers une face avant (22) d'une coupelle d'injecteur respective (20), ladite face avant (22) étant distale du trou de tube (11) par rapport à un axe central du premier orifice (B1). Le second orifice (B2) est agencé pour fournir une communication d'écoulement de fluide du premier orifice (B1) à un volume interne (21) de la coupelle d'injecteur (20). Le premier orifice (B1) est pourvu d'un bouchon (60) à une extrémité distale du premier orifice (B1) par rapport au trou de tube (11). Une extrémité distale du premier orifice (B1) est pourvue d'un boîtier de bouchon (61) de telle sorte que, radialement par rapport à un axe de bouchon (Ap), le boîtier de bouchon (61) a un diamètre supérieur lorsqu'il est comparé à un diamètre du premier orifice (B1). Le boîtier de bouchon (61) est pourvu d'un coin (70) qui est agencé pour pousser et solliciter le bouchon (60) en direction du trou de tube (11). Le boîtier de bouchon (61) est en outre pourvu d'une paire d'orifices de coin (71) destinés à recevoir et loger le coin (70) à travers l'axe de bouchon (Ap).
PCT/EP2023/061302 2022-06-03 2023-04-28 Rampe à carburant et son procédé de préparation simple WO2023232363A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2022/009107 TR2022009107A2 (tr) 2022-06-03 Bi̇r yakit rayi ve bu yakit rayinin hazirlanmasi i̇çi̇n basi̇t bi̇r yöntem
TR2022009107 2022-06-03

Publications (1)

Publication Number Publication Date
WO2023232363A1 true WO2023232363A1 (fr) 2023-12-07

Family

ID=89025783

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/061302 WO2023232363A1 (fr) 2022-06-03 2023-04-28 Rampe à carburant et son procédé de préparation simple

Country Status (1)

Country Link
WO (1) WO2023232363A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090133676A1 (en) * 2005-06-06 2009-05-28 Fernando Lepsch Fuel-heating assembly and method for the pre-heating of fuel an internal combustion engine
WO2012150074A1 (fr) * 2011-05-02 2012-11-08 Robert Bosch Gmbh Distributeur de combustible
US20160333836A1 (en) * 2014-01-15 2016-11-17 Robert Bosch Gmbh Fuel injection system having a fuel-conveying component, a fuel injector and connecting device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090133676A1 (en) * 2005-06-06 2009-05-28 Fernando Lepsch Fuel-heating assembly and method for the pre-heating of fuel an internal combustion engine
WO2012150074A1 (fr) * 2011-05-02 2012-11-08 Robert Bosch Gmbh Distributeur de combustible
US20160333836A1 (en) * 2014-01-15 2016-11-17 Robert Bosch Gmbh Fuel injection system having a fuel-conveying component, a fuel injector and connecting device

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