EP3636914A1 - Fluideinspritzanordnung für einen verbrennungsmotor - Google Patents

Fluideinspritzanordnung für einen verbrennungsmotor Download PDF

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Publication number
EP3636914A1
EP3636914A1 EP18199059.9A EP18199059A EP3636914A1 EP 3636914 A1 EP3636914 A1 EP 3636914A1 EP 18199059 A EP18199059 A EP 18199059A EP 3636914 A1 EP3636914 A1 EP 3636914A1
Authority
EP
European Patent Office
Prior art keywords
projection
injection assembly
fluid injection
slot
assembly according
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.)
Withdrawn
Application number
EP18199059.9A
Other languages
English (en)
French (fr)
Inventor
Giandomenico Serra
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.)
Vitesco Technologies GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP18199059.9A priority Critical patent/EP3636914A1/de
Publication of EP3636914A1 publication Critical patent/EP3636914A1/de
Withdrawn legal-status Critical Current

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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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
    • 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
    • F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches

Definitions

  • the present disclosure relates to a fluid injection assembly for an internal combustion engine, particularly but not exclusively, for fuel injection assemblies e.g. for a gasoline direct injection internal combustion engine.
  • Fuel injection assemblies are widely used for injecting fuel into an internal combustion engine, in one form having an injector for each cylinder of a multi-cylinder engine in which the fuel is supplied from a reservoir in the form of a common rail to which each of the injectors is connected.
  • the injectors may be secured directly to a bore in the cylinder head of the engine to project into the combustion chamber.
  • noise generated by the injection and combustion process to be transmitted through the engine to the exterior.
  • a direct mechanical connection between the injector and the engine can be avoided by suspending the injector in a fuel rail injector cup which is itself secured to the fuel rail and the engine. In this way there is no direct mechanical coupling between the injector and the engine components.
  • the fuel injector it is possible for the fuel injector to pivot about the axis of the bore in the cylinder head or the injector cup during assembly or during use due to the vibrations to which the engine and fuel injectors are subjected.
  • the fuel injector In order to achieve the required fuel injection spray pattern into the combustion chamber, the fuel injector should be precisely positioned angularly relative to the bore or the injector cup so that the fuel injector fuel output is in the correct position relative to the combustion chamber.
  • the present disclosure seeks to provide a fluid injection assembly which is easier and quicker to assemble, whilst ensuring the correct positioning of the fluid injection spray.
  • a fluid injection assembly comprising an elongate fluid injector.
  • the fluid injector comprises a valve body and a securing element, the valve body having a longitudinal axis and having a fluid inlet port and a fluid outlet port.
  • the fluid injection assembly is a fuel injection assembly and the fluid injector is a fuel injector, the valve body having fuel inlet and outlet ports as the fluid inlet and outlet ports, respectively.
  • valve body is adapted to be located in a - preferably generally cylindrical - bore in a housing of an internal combustion engine.
  • the fluid injection assembly comprises the housing and the valve body may expediently be received in the bore.
  • the securing element is located on the valve body and has a projection engageable in a slot of the housing for securing the fluid injector to the housing to locate the fluid injector in a predetermined position relative to the engine.
  • the projection has at least one deformable element projecting from the main body of the projection, the deformable element being deformed when the projection is inserted in the slot so that the projection is held with a force fit in the slot.
  • That the projection is engageable in a slot of the housing "for securing the fluid injector to the housing to locate the fluid injector in a predetermined position relative to the engine" means in particular that an angular position of the fluid injector relative to the housing with respect to a rotation around the longitudinal axis is fixed by means of the force-fit connection of the protrusion with the housing when the projection is inserted in the slot.
  • the force fit connection may also contribute to hold the fluid injector in a predetermined axial position.
  • the fluid injector may additionally be fixed with respect to the housing by means a screw and/or a bolt.
  • the force fit provides a fastening between the projection and the slot and, therefore, between the injector and the housing, which is achieved by friction after the parts are pushed together.
  • the use of the at least one deformable element enables the injector to be easily engaged with the housing using the projection as a coarse fit or locator and by using the deformable element or elements to engage the securing element with the housing by friction in the desired position.
  • the connection between the securing element and the housing may also be resilient due to the use of the deformable element or elements.
  • a force fit is designed to maintain a controlled pressure between mating parts, and is commonly used where forces or torques are being transmitted through the joining point.
  • a force fit is achieved by applying a force during component assembly.
  • An indexing of the injector with respect to the internal combustion engine and combustion chamber may be provided in some embodiments due to the engagement of the securing element with its deformable element or elements in the slot in the housing of the engine. Indexing describes the angular orientation - in particular with regard to rotation around the longitudinal axis - of the injector, e.g. with respect to the combustion chamber of the engine, which enables a correct spray layout of the fuel in the combustion chamber.
  • the deformation element may have the form of a flap or wing which extends substantially perpendicularly form a side face of the projection in the unmounted state.
  • the element or elements deform upwardly as the projection is pushed downwards into the slot to provide the force fit between the securing element and the housing.
  • “upwardly” is the direction parallel to the longitudinal axis from the fluid outlet port towards the fluid inlet port and “downwards” is the opposite direction, i.e. the direction parallel to the longitudinal axis from the fluid inlet port towards the fluid outlet port.
  • the deformable elements deform as the projection is inserted into the slot, a resilient connection is provided between the securing element and the housing.
  • the deformable elements enable any misorientation of the projection in relation to the slot to be compensated by the amount of deformation of the deformable element or elements. Therefore, insertion of the securing element into the slot is simplified and a reliable orientation of the injector with respect to the housing - in case of a fuel injector, thus, in particular with respect to the engine and, in particular, the combustion chamber with which the injector is associated - is achieved.
  • the securing element comprises a body that is over moulded to the fluid injector.
  • the securing element is comprised by an actuator module of the fluid injector.
  • the actuator module e.g. extends circumferentially around a portion of the valve body.
  • the valve body extends through a central bore, i.e. a central opening of the securing element.
  • the deformable element is arranged on a first surface of the projection and is used to press an opposing second surface of the projection against a surface of the slot.
  • the first and second surfaces may extend parallel to the longitudinal axis.
  • two deformable elements are disposed on opposite sides of the main body of the projection so as to engage opposed faces of the slot.
  • the opposite sides and opposed faces, respectively may face away from each other in circumferential direction around the longitudinal axis.
  • the two deformable elements provide a self-centring mechanism so that the projection is positioned at the centre of the slot. This enables the projection to be more easily inserted into the slot and arranged in the proper position, since any initial mis-orientation of the projection in relation to the width of the slot is compensated by the two deformable elements.
  • the deformable element or elements comprise a generally planar strip(s) extending generally outwardly from the main body of the projection towards the face(s) of the slot when the projection is inserted in the slot.
  • the deformable element or elements have a root and an outer extremity and are tapered being thinner, and/or narrower laterally, at their outer extremity than at their root on the projection.
  • the root merges with the main body and the outer extremity is located at an end of the deformable element remote from the main body.
  • the deformable elements may be inclined at an angle to the direction of insertion.
  • the deformable elements may be aligned in the direction of insertion or at an acute angle relative thereto and comprise a triangular planar element increasing in lateral extent the further the element is insertable in the slot in the direction of insertion.
  • the deformable elements may be formed integrally with the securing element, but in other embodiments the deformable elements are separate components secured to the projection.
  • the deformable elements are held resiliently when inserted in the slot so as to be removable. In another embodiment, the deformable elements are permanently deformed when inserted in the slot.
  • the entire securing element or a portion of the securing element - e.g. the main body of the protrusion - may be formed of steel, an alloy or rubber or a plastics material.
  • the deformable elements may be formed of a different material from other portions of the securing element, in particular in embodiments in which the main body of the protrusion is formed of steel or another alloy.
  • the securing element and the deformable element or elements are formed from plastic.
  • the valve body may be overmoulded with the securing element.
  • a coupling between the injector overmoulding and the cylinder head is provided by way of at least one deformable element.
  • the quantity and dimension of the deformation element(s) can vary depending on the application.
  • the interference between the two components can be selected to set the required insertion force.
  • the insertion force may also depend on the application requirements. For example, the ease of assembly may be less or more important than a high angular position accuracy so that a larger or smaller dimension can be used since different dimensions enable the injector to be blocked in a predetermined angular orientation in different application conditions.
  • the behaviour of the deformation elements or wings can be influenced by adding a smaller or larger draft angle in the horizontal, or vertical direction or both so that the area of the section decreases as the distance from the root of the wing to the extremity of the wing increases.
  • the draft angle can be used to increase the precision of the orientation due to the decreasing stiffness of the wing along its length. A higher precision can be achieved with the same deformation on the two or more wings by way of symmetric geometry.
  • the orientation of the wings may be horizontal, vertical or include a combination of a straight and an inclined portion. A step or abrupt changed in place of a gradual change in orientation may also be used.
  • the deformation of the deformable elements may be permanent or reversible depending on the material used and the amount of deformation that occurs upon insertion.
  • FIG. 2 in particular illustrates schematically a fluid injector 1 - in the present embodiment a fuel injector - secured in a housing 4 of an internal combustion engine.
  • the fuel injector 1 comprises a valve body 2 extending along a longitudinal axis L from a fuel inlet 8 to a fuel outlet 6, both comprised by the valve body 2.
  • the valve body 2 is depicted as a solid body in the figures for sake of simplicity. However, the valve body 2 is in fact hollow, having a cavity which fluidly connects the fluid inlet 8 to the fluid outlet 6.
  • the valve body 2 has a valve seat and at least one orifice or is fixed to a seat body comprising the valve seat and the orifice (s) .
  • a valve needle and, in the case of the fluid injector 1 being a solenoid injector, preferably also a magnetic armature is/are received in the cavity. Further elements, such as a filter, a spring for biasing the needle, may be comprised by the valve body and are known in principle to the person skilled in the art so that they are not described in further detail here.
  • the fuel outlet 6 of the injector is in fluid communication with the combustion chamber of the engine for direct injection of the fuel into the combustion chamber.
  • the fuel inlet 8 is provided for connecting the fuel injector 1 to a fuel supply.
  • a fuel injector 2 is supplied for each cylinder of the engine and fuel to the cylinders is provided through the common rail (not shown) comprising a fuel reservoir having a plurality of spaced fuel outlets, one for each fuel injector.
  • valve body 2 has bonded thereto securing element 10 which may be an over-moulding which serves to secure the fuel injector 1 to the engine in the correct location to ensure that fuel spray is directed into the combustion chamber in the desired direction and position.
  • securing element 10 which may be an over-moulding which serves to secure the fuel injector 1 to the engine in the correct location to ensure that fuel spray is directed into the combustion chamber in the desired direction and position.
  • the over-moulding also forms an electrical connector 11 of an actuator module of the fuel injector 1.
  • the fuel injector 1 is shown as being secured directly into the cylinder head which comprises the housing 4, the valve body 2 being received in a cylindrical bore 5 of the housing 4.
  • the housing is a cylinder head in the present embodiment.
  • the fuel injector is located in an injector receptacle which forms part of the housing 4.
  • the fuel injector 1 is secured with the intake manifold - also denoted as inlet manifold - of the internal combustion engine to direct fuel towards the inlet valve or valves of the engine.
  • the securing element 10 includes a central opening 12 in which the valve body 2 of the fuel injector 1 is located.
  • the valve body 2 projects from the central opening 12 in both directions of the longitudinal axis L.
  • the securing element 10 has a main body 14 having a projection 16 extending in a direction radially outwardly from the central opening 12 and in the present embodiment having the same dimension in the axial direction of the bore 12 as the main body 14 of the securing element 10.
  • the electrical connector 11 extends away from the central opening 12 in a radial direction opposite to the radial direction in which the projection 16 extends away from the opening 12.
  • the housing 4 has a slot 18 adapted to receive the projection 16 when the fuel injector 2 is inserted in the housing.
  • the projection 16 has outwardly extending deformable elements 20 which as shown, particularly in Figure 5 , are adapted to be deformed when the fuel injector is inserted in the housing 4 so that the projection 16 enters the slot 18 downwardly from the upper open end 22 of the slot 18.
  • the deformable elements 20 shown in Figures 1 and Figure 5 are deformed as the projection 16 is pushed into the slot 18 so that the projection 16 and hence the securing element 10 and the fuel injector 2 are held securely in the desired location so that the fuel injector 2 is prevented from moving pivotably about its axis .
  • the deformable elements 20 comprise a generally planar strip extending at right angles from the two opposing side faces of the projection 16.
  • two deformable elements 20 are provided.
  • only one deformable element is provided so that the projection 16 is urged against one side face of the slot 18 by the force of deformation of the one deformable element.
  • the width W, the length L and the thickness T of the deformable elements 20 depend upon the strength of the interference fit required for the particular installation.
  • the width W1 at the root of the deformable element 20 where it joins the projection 16 is greater than the width W2 of the outer end or extremity of the deformable element 20, whilst the thickness T1 at the root is greater than the thickness T2 up at the outer end.
  • Figure 6B shows an arrangement in which the deformable element 20 is essentially triangular when viewed in the radial direction of the injector 2 having its smallest extent at the lowermost part of the deformable element 20 and increasing its dimension towards the upper part of the deformable element 20.
  • the force of engagement between the projection 16 and the housing increases as the projection 16 is pressed down into the slot 18.
  • the deformable element 20 lies in a plane parallel to the axis of the bore 12.
  • Figure 6C shows an alternative arrangement in which the deformable element 20 is located at an acute angle to a plane parallel to the axis of the bore 12.
  • the orientation of the deformable elements 20 can be horizontal, vertical or inclined relative to the direction of insertion of the projection 16 into the slot 18.
  • deformable elements 20 are shown as generally having a gradual continuous change in dimensions, it is possible that they may be provided with a stepped shape to give the deformation character required.
  • the deformable elements 20 are formed integrally with the securing element 10.
  • the securing element and the deformable elements 20 may be formed of a plastics material.
  • the deformable elements 20 may be formed of a different material from rest of the securing element 10, which may be a rubber or plastics material, which are bonded to the projection 16. In this way, the precise force holding the projection 16 in the precise position required in the housing 4 and hence the force holding the fuel injector 2 in position can be varied to suit the precise requirements of the particular installation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP18199059.9A 2018-10-08 2018-10-08 Fluideinspritzanordnung für einen verbrennungsmotor Withdrawn EP3636914A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18199059.9A EP3636914A1 (de) 2018-10-08 2018-10-08 Fluideinspritzanordnung für einen verbrennungsmotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18199059.9A EP3636914A1 (de) 2018-10-08 2018-10-08 Fluideinspritzanordnung für einen verbrennungsmotor

Publications (1)

Publication Number Publication Date
EP3636914A1 true EP3636914A1 (de) 2020-04-15

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EP18199059.9A Withdrawn EP3636914A1 (de) 2018-10-08 2018-10-08 Fluideinspritzanordnung für einen verbrennungsmotor

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5121731A (en) * 1991-06-20 1992-06-16 Siemens Automotive L.P. Means for mounting a fuel injector on a fuel rail
WO1997027398A1 (en) * 1996-01-22 1997-07-31 Siemens Automotive Corporation Method and arrangement for mounting fuel rails
US6325049B1 (en) 1999-06-23 2001-12-04 Siemens Automotive Corporation Fuel injector with orientation feature for orienting injector with respect to the manifold or head
US20040194760A1 (en) * 2003-04-01 2004-10-07 Robert Bosch Corporation Fuel rail assembly
WO2008064941A1 (de) * 2006-11-30 2008-06-05 Robert Bosch Gmbh Brennstoffeinspritzventil und brennstoffeinspritzsystem
DE102016225706A1 (de) * 2016-12-21 2018-06-21 Robert Bosch Gmbh Ventil zum Zumessen eines Fluids

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5121731A (en) * 1991-06-20 1992-06-16 Siemens Automotive L.P. Means for mounting a fuel injector on a fuel rail
WO1997027398A1 (en) * 1996-01-22 1997-07-31 Siemens Automotive Corporation Method and arrangement for mounting fuel rails
US6325049B1 (en) 1999-06-23 2001-12-04 Siemens Automotive Corporation Fuel injector with orientation feature for orienting injector with respect to the manifold or head
US20040194760A1 (en) * 2003-04-01 2004-10-07 Robert Bosch Corporation Fuel rail assembly
WO2008064941A1 (de) * 2006-11-30 2008-06-05 Robert Bosch Gmbh Brennstoffeinspritzventil und brennstoffeinspritzsystem
DE102016225706A1 (de) * 2016-12-21 2018-06-21 Robert Bosch Gmbh Ventil zum Zumessen eines Fluids

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