WO2009129520A1 - Système pour isoler un injecteur de carburant - Google Patents

Système pour isoler un injecteur de carburant Download PDF

Info

Publication number
WO2009129520A1
WO2009129520A1 PCT/US2009/041071 US2009041071W WO2009129520A1 WO 2009129520 A1 WO2009129520 A1 WO 2009129520A1 US 2009041071 W US2009041071 W US 2009041071W WO 2009129520 A1 WO2009129520 A1 WO 2009129520A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel injector
support
recited
cavity
injector system
Prior art date
Application number
PCT/US2009/041071
Other languages
English (en)
Inventor
Russell J. Wakeman
Original Assignee
Cooper-Standard Automotive Inc.
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 Cooper-Standard Automotive Inc. filed Critical Cooper-Standard Automotive Inc.
Publication of WO2009129520A1 publication Critical patent/WO2009129520A1/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
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10216—Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
    • 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
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • This disclosure relates to fuel injectors and, more particularly, to a system for isolating a fuel injector to reduce noise.
  • Fuel injectors used in vehicles typically utilize a solenoid or piezoelectric actuator to move a valve element between stops that define open and closed valve positions. Impact between the valve element and the stops may create a substantial amount of vibration.
  • the fuel injector is rigidly connected to a fuel rail, engine cylinder head, or both. The rigid connection may transmit vibration from the fuel injector to other locations in the vehicle where the vibration manifests as noise that may be audible to a vehicle occupant.
  • An exemplary fuel injector system includes a fuel injector, a first support having a first cavity that houses a portion of the fuel injector, and a second support secured to the first support.
  • the second support includes a second cavity that houses a different portion of the fuel injector.
  • the first and second cavities are larger than the portions of the fuel injector such that there is a clearance space between the fuel injector and walls of the first and second cavity.
  • a resilient isolator is seated against the first and second support and located within the clearance space between the fuel injector and the walls for damping vibration.
  • the first support may include a first frustoconical surface and the second support may include a second frustoconical surface.
  • the resilient isolator may be seated against the first and second frustoconical surfaces within the clearance space between the fuel injector and the walls for damping vibration.
  • An exemplary method of vibrational isolation includes limiting transmission of vibrations from the fuel injector to the first and second support by establishing the first and second cavities to be larger than the portions of the fuel injector such that there is a clearance space between the fuel injector and walls of the first and second cavity, and seating a resilient isolator against the first and second supports within the clearance space between the fuel injector and the walls to damp the vibrations.
  • Figure 1 illustrates an example injector system for isolating fuel injector vibration.
  • Figure 2 illustrates a cross section of the injector system of Figure 1.
  • Figure 3 illustrates a portion of the injector system as shown in Figure 2.
  • Figure 1 illustrates selected portions of an example injector system 10 for isolating a fuel injector 12 (Figure 2) from an engine cylinder head 14 to reduce noise.
  • Figure 2 illustrates a cross section of the injector system 10 shown in Figure 1
  • Figure 3 illustrates a closer view of a particular section of the injector system 10.
  • the fuel injector 12 may include a solenoid, piezoelectric, or other type of actuator for moving a valve element between an open and closed position to deliver fuel from a fuel source 13 into an engine cylinder head 14.
  • the valve element may move relatively quickly between stops that define the open and closed positions. Impact between the valve element and the stops may produce vibrations that can create a substantial amount of noise if transferred from the fuel injector 12 to the engine cylinder head 14.
  • the injector system 10 isolates the fuel injector 12 from the engine cylinder head 14 to thereby limit transmission of vibration from the fuel injector 12.
  • the engine cylinder head 14 (i.e., second support) includes a cavity 16 that receives a portion of the fuel injector 12.
  • the cavity 16 may be machined into the engine cylinder head 14 with a shape that corresponds to the shape of the fuel injector 12.
  • the cavity 16 is slightly larger than a fuel injector 12, such that there is a clearance between the fuel injector 12 and the sidewalls of the cavity 16.
  • the fuel injector 12 does not actually contact any of the sidewalls of the cavity 16.
  • the cavity 16 includes a surface 18 that is recessed relative to an outer surface 20 of the engine cylinder head 14.
  • the surface 18 is a frustoconical surface that transversely extends relative to the plane of the outer surface 20. That is, the surface 18 forms a conical angle between 0° and 90° relative to the outer surface 20.
  • the surface 18 may have a slight curvature.
  • the cavity 16 also includes a slot 22 that opens through a side 24 of the engine cylinder head 14.
  • the slot 22 receives an electrical connector 24 of the fuel injector 12 and orients the fuel injector 12 in a desired rotational orientation about central axis A such that the fuel injector 12 ejects fuel in a desired direction.
  • the electrical connector 24 extends from a main body 26 of the fuel injector.
  • the main body 26 i.e., housing
  • the main body 26 includes a flange 28 that extends circumferentially about the main body 26 and an injector nozzle 30 that extends opposite from the flange 28.
  • An o-ring 31 on the nozzle 30 forms a seal between the fuel injector 12 and the engine cylinder head 14.
  • the main body 26, including the flange 28 and nozzle 30, defines the central axis A of the fuel injector 12.
  • the fuel injector 12 also includes a fuel connector portion 33.
  • the fuel connector portion 33 includes an o-ring 37 that forms a seal between the fuel injector 12 and a cap 40 for securing the fuel injector 12 to the engine cylinder head 14.
  • the fuel connector portion 33 fluidly connects to a flexible tube 35 that runs between the fuel source 13 and the fuel injector 12.
  • the flexible tube 35 may be mechanically connected to the fuel injector 12 or to the cap 40 using a suitable fitting.
  • the flexible tube 35 provides the benefit of limiting transmission of vibration from the fuel injector 12 by damping any vibration.
  • the cap 40 (i.e., a first support) includes a cavity 42 for at least partially receiving the flange 28 of the fuel injector 12.
  • the cap 40 may be cast from a metal or alloy material or formed from a polymer or polymer composite.
  • the cavity 42 generally corresponds to the shape of the top of the fuel injector 12 and flange 28, but is somewhat larger such that there is a clearance between the fuel injector 12 and the sidewalls of the cavity 42. Thus, the fuel injector 12 does not actually contact any of the sidewalls of the cavity 42.
  • the cavity 42 includes a surface 43 that is recessed relative to an outer surface 45 of the cap 40.
  • the surface 43 is a frustoconical surface that transversely extends relative to the plane of the outer surface 45. That is, the surface 43 forms a conical angle between 0° and 90° relative to the outer surface 45.
  • the surfaces 18 and 43 and symmetrically angled relative to the respective outer surfaces 20 and 45 (which form a plane).
  • the surface 43 may have a slight curvature.
  • a bolt 44 extends through an opening 46 within the cap 40 and into a threaded opening 48 within the engine cylinder head 14 to secure the cap 40 and the engine cylinder head 14 together.
  • the opening 46 may be somewhat larger than the diameter of the bolt 44 (i.e., the bolt shaft) to provide play between the cap 40 and the engine cylinder head 14.
  • the cap 40 is shown and a distinct piece, the shape and function of the cap 40 may alternatively be integrated into a fuel rail manifold that delivers the fuel to the fuel injector 12.
  • a resilient isolator 50 extends circumferentially around the flange 28 of the fuel injector 12.
  • the resilient isolator 50 includes a first bead 52a and a second bead 52b connected by a V-shaped bridge 54.
  • the profile of the V-shaped bridge 54 corresponds to the profile of the flange 28 such that the resilient isolator 50 fits intimately over the flange 28.
  • the resilient isolator 50 may be made from any type of material that is suitable for vibrationally isolating the fuel injector 12 from the engine cylinder head 24.
  • the material is stiff enough to support the fuel injector 12 and soft enough to facilitate vibration damping.
  • the resilient isolator 50 may be formed from a polymer, such as an elastomer, a thermoplastic, or a thermoset.
  • the resilient isolator 50 is formed from polytetrafluoroethylene.
  • the polytetrafluoroethylene may include a filler material to increase damping characteristics, such as fibers or powder filler.
  • the resilient isolator 50 may also be formed from a composite of any of the above materials in combination with metals or alloys. If the resilient isolator 50 is formed from an elastomer material, the resilient isolator 50 may be a single piece that can be stretched over and onto the flange 28. However, if the resilient isolator 50 is formed of a less elastic material, the resilient isolator 50 may be formed from multiple pieces that are then mounted onto the flange 28 (e.g., press fit). Given this description, one of ordinary skill in the art will recognize suitable types of materials for use as the resilient isolator 50 to meet their particular needs.
  • the resilient isolator 50 facilitates proper positioning of the fuel injector 12 relative to the engine cylinder head 14.
  • the second bead 52b seats against the surface 18 of the cavity 16, and the first bead 52b seats against the surface 43 of the cavity 42 when the cap 40 is assembled over the fuel injector 12.
  • the conical shape of the surface 18 self-centers the fuel injector 12 relative to the cavity 16.
  • the conical shape of the surface 43 self-centers the cap 40 on the resilient isolator 50 relative to axis A.
  • the self-centering provides the benefit of eliminating or reducing the need for manually aligning the cap 40 or fuel injector 12 using a tight tolerance relative to the engine cylinder head 14.
  • centering of the cap 40 on the first bead 52a may be further facilitated if the opening 46 of the cap 40 is formed larger than the diameter of the bolt 44 to provide play between the cap 40 and the bolt 44.
  • the resilient isolator 50 facilitates vibrationally isolating the fuel injector 12 from the engine cylinder head 14.
  • the combination of the angled surfaces 18 and 43 with the V-shape of the resilient isolator 50 provides axial and radial support of the fuel injector 12 relative to axis A. That is, the cap 40, resilient isolator 50, and surfaces 18 and 43 provide proper axial positioning of the fuel injector 12 and limit radial movement of the fuel injector 12 to maintain the proper position.
  • the fuel injector 12 contacts only the resilient isolator 50, the o-ring 31, the o-ring 37, and the flexible tube 35 (or connection thereto), and does not directly contact the engine cylinder head 14.
  • vibration from the fuel injector 12 must travel through the resilient isolator 50, the o-ring 31, the o-ring 37, or the flexible tube 35, which each dampen the vibration and avoid use of a rigid connection.
  • the resilient isolator 50 may also serve as a secondary seal.
  • the resilient isolator 50 may function as a secondary seal to the o-rings 31 and 37.
  • the flange 28 may be located between the electrical connector 24 and the nozzle 30 such that the resilient isolator 50 seals the electrical connector 24 from any fuel that migrates past the o- ring 31.
  • the injector system 10 may be varied from the design shown to meet the needs of a particular application.
  • the variations are not limited, a few variations may include modifying the shapes of the resilient isolator 50 and flange 28.
  • the resilient isolator 50 may include beads having any suitable shape, such as circular, oval, or diamond shaped beads.
  • the profile of the flange 28 may be V- shaped as shown, or another desired shape.
  • the upper portion of the cavity 16 having the angled surface 18 may be provided in a separate piece from the engine cylinder head 14.
  • the separate piece may include an outer surface that is analogous to the outer surface 20 of the engine cylinder head 14 and a recessed surface that is analogous to the angled surface 18.
  • the separate piece may be retrofitted onto an existing engine cylinder heads rather than machining the surface 18 into the engine cylinder head 14.

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

L’invention concerne un système d’injecteur de carburant qui comprend un injecteur de carburant, un premier support comportant une première cavité qui loge une partie de l’injecteur de carburant, et un second support fixé au premier support. Le second support comprend une seconde cavité qui loge une partie différente de l’injecteur de carburant. Les première et seconde cavités sont plus grandes que les parties de l’injecteur de carburant de telle sorte qu’il existe un volume perdu entre l’injecteur de carburant et les parois des première et seconde cavités. Un isolateur élastique est placé contre le premier et le second support et situé dans le volume perdu entre l’injecteur de carburant et les parois pour amortir la vibration.
PCT/US2009/041071 2008-04-18 2009-04-20 Système pour isoler un injecteur de carburant WO2009129520A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4597608P 2008-04-18 2008-04-18
US61/045,976 2008-04-18

Publications (1)

Publication Number Publication Date
WO2009129520A1 true WO2009129520A1 (fr) 2009-10-22

Family

ID=41199487

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/041071 WO2009129520A1 (fr) 2008-04-18 2009-04-20 Système pour isoler un injecteur de carburant

Country Status (1)

Country Link
WO (1) WO2009129520A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8800534B2 (en) 2011-11-18 2014-08-12 Robert Bosch Gmbh Fuel rail mounting arrangement
US8875681B2 (en) 2011-10-28 2014-11-04 Robert Bosch Gmbh Fuel rail mounting arrangement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6009856A (en) * 1998-05-27 2000-01-04 Caterpillar Inc. Fuel injector isolation
US6840226B2 (en) * 2001-03-14 2005-01-11 Robert Bosch Gmbh Fuel injection valve
US7293550B2 (en) * 2006-01-31 2007-11-13 Gm Global Technology Operations, Inc. Fuel injector isolation seat

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6009856A (en) * 1998-05-27 2000-01-04 Caterpillar Inc. Fuel injector isolation
US6840226B2 (en) * 2001-03-14 2005-01-11 Robert Bosch Gmbh Fuel injection valve
US7293550B2 (en) * 2006-01-31 2007-11-13 Gm Global Technology Operations, Inc. Fuel injector isolation seat

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8875681B2 (en) 2011-10-28 2014-11-04 Robert Bosch Gmbh Fuel rail mounting arrangement
US8800534B2 (en) 2011-11-18 2014-08-12 Robert Bosch Gmbh Fuel rail mounting arrangement

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