WO2019134990A1 - Pompe à carburant haute pression pour système d'injection de carburant - Google Patents

Pompe à carburant haute pression pour système d'injection de carburant Download PDF

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Publication number
WO2019134990A1
WO2019134990A1 PCT/EP2019/050217 EP2019050217W WO2019134990A1 WO 2019134990 A1 WO2019134990 A1 WO 2019134990A1 EP 2019050217 W EP2019050217 W EP 2019050217W WO 2019134990 A1 WO2019134990 A1 WO 2019134990A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
fuel
fuel pump
pressure fuel
pump
Prior art date
Application number
PCT/EP2019/050217
Other languages
German (de)
English (en)
Inventor
Walter Janker
Markus Zankl
Original Assignee
Cpt Group 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 Cpt Group Gmbh filed Critical Cpt Group Gmbh
Publication of WO2019134990A1 publication Critical patent/WO2019134990A1/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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/184—Tightening mechanisms
    • F16J15/185—Tightening mechanisms with continuous adjustment of the compression of the packing
    • F16J15/186—Tightening mechanisms with continuous adjustment of the compression of the packing using springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/56—Other sealings for reciprocating rods
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • F02M59/368—Pump inlet valves being closed when actuated
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0054—Check valves

Definitions

  • the invention relates to a high-pressure fuel pump for loading a fuel in a Kraftstoffein- injection system with high pressure.
  • Such high-pressure fuel pumps are used in Kraftlichin injection systems to compress a fuel and thus to apply a high pressure.
  • the fuel under high pressure is then injected by means of a fuel injection device in combustion chambers of an internal combustion engine.
  • the pressure in gasoline internal combustion engines is in a range of 150 bar to 400 bar and in the selbrennkraftmaschinen in a range of 1500 bar to 3000 bar. The more the fuel is compressed, the lower are the resulting during the combustion process
  • these high-pressure fuel pumps are designed as piston pumps Kol, wherein the fuel is compressed by a Penk penkolben in a pressure chamber by a translational movement of the pump piston. Due to the uneven promotion of such piston pumps arise on a low pressure side of the high-pressure fuel pump fluctuations in Vo lumenstrom, which are associated with pressure fluctuations in the overall system. These so-called pulsations are in particular in one
  • low-pressure dampers are therefore used, for example in high-pressure gasoline fuel pumps, on the low-pressure side, which operate as hydraulic accumulators which compensate for the fluctuations in the volume flow and thus reduce the pulsations that arise.
  • these low-pressure dampers usually have deformable dampers, for example a gas-filled capsule. If the pressure rises on the low-pressure side, the capsule deforms, creating space for the superfluous fuel in the volumetric flow. If the pressure drops again at a later time, the capsule returns to its original shape and the stored fuel is thus released again.
  • a metal capsule is usually used because with plastic capsules or rubber membranes due to the permeability, the gas escapes with time and thus no more damping is given.
  • Such low-pressure damper are made for example
  • High-pressure fuel pump disclosed with a low-pressure damper, which is mounted on a head portion of the high-pressure fuel pump.
  • a defined space in or on the high-pressure fuel pump is required for the gas-filled metal capsule.
  • the space must have a defined min least size and is usually cylindrical, since it depends on the production process of the metal capsule.
  • the installation space which is required for the known damping systems, significantly reduces the free space for the orientation of connections to the high-pressure fuel pump. Therefore, this required installation space of previous damper concepts resulted overall in increasing the high-pressure fuel pump.
  • the object of the invention is therefore to propose a high-pressure fuel pump improved with regard to the damping of pulsations in the low-pressure range.
  • a high pressure fuel pump for pressurizing a fuel in a high pressure fuel injection system includes a housing having an axial housing bore defined at a first end portion by a seal assembly and a pump piston guided in the housing bore and extending through the seal assembly.
  • the log processing arrangement comprises a fixed in the housing bore sealing shell, a sealing ring which is axially movably in contact with the pump piston on its inner circumference and is axially movably held by the sealing shell at its outer periphery, and a return element, which is located on the sealing shell and the Sealing ring is supported to apply an axial spring force on the sealing ring.
  • the sealing ring characterized in that the sealing ring is acted upon axially with a spring force of the resilient return element, the sealing ring simultaneously acts as a damper, because it can compensate for the axial adjustment due to its axial mobility a pulsating volume.
  • the function of the already used sealing arrangement in the high-pressure fuel pump is extended by the seal assembly seals not only the axially moving pump piston, but in addition, characterized in that the seal itself can move axially in its seat on the sealing shell and thereby on its outer periphery dynamically seals, an attenuation function is inte griert. Because of the axial movement possibility of the sealing ring, it can compensate for a volume and thus have a damping effect.
  • the spring force of the restoring element counteracts a pulsation direction on the sealing ring as a counterforce.
  • the sealing ring which seals the pump piston from combined, designed as a rod seal and piston seal.
  • the space for the sealing ring is preferably designed so that an axial movement on its outer periphery is possible.
  • the sealing ring is received in a shell portion of the seal assembly, wherein a piston support member for limiting the shell portion is provided opposite to the return element.
  • a piston support member for limiting the shell portion is provided opposite to the return element.
  • a leakage discharge device is advantageously arranged in the shell section in order to derive a fuel leak occurring during operation of the high-pressure fuel pump in the sealing shell from the sealing shell.
  • an optionally functional fuel leakage at the new dynamic sealing point on the outer circumference of the seal ring can be derived in the same known way, for example in an engine compartment, as the fuel leakage of the existing dynamic sealing point between the inner circumference of the seal ring and the pump piston.
  • the seal assembly is disposed in a low pressure region of the housing bore, wherein the low-pressure region is in fluid communication with a fuel inlet, the fuel from outside to the high fuel pressure pump, wherein in the fuel inlet a return check valve is arranged to a back flow of fuel from the To prevent high-pressure fuel pump in the fuel inlet.
  • the housing bore forms at a second end region of a pressure chamber in which the fuel is pressurized by the pump piston with high pressure, wherein a fuel inlet bore to the pressure chamber coaxial with the hous sebohrung is formed at the second end portion.
  • the fuel inlet bore coaxial be mounted above the middle of the housing, bringing with it a better manufacturability of the housing bore, as this is then formed upwards continuously in the housing.
  • the honing tool can dip into the area of the fuel inlet bore.
  • the assembly and the design of the overall high-pressure fuel pump is simplified, since the Pum penkolben could now be joined from above via the fuel inlet bore, wherein the fuel inlet bore is arranged on a main axis of rotation or rotationally symmetrical to the housing.
  • the possibility rota tion symmetric to install housing components which brings advantages in terms of voltage distribution of example, welded parts.
  • At least partially disposed in the fuel inlet bore is an inlet valve having a radially extending male terminal, the housing is designed such that the plug connection can be rotated freely by 360 °.
  • the connector can be rotated freely and there are more degrees of freedom for the orientation of the connector at the customer.
  • FIG. 1 shows a longitudinal sectional view of a high-pressure fuel pump with a low-pressure damper, which is attached to a head end of the high-pressure fuel pump according to the prior art.
  • Fig. 2 is a partial view of a longitudinal section of a
  • Fig. 3 is a longitudinal sectional view of a high-pressure fuel pump according to FIG. 2, wherein at the head region of the high-pressure fuel pump, an inlet valve is arranged.
  • Fig. 1 shows a longitudinal sectional view of a high-pressure fuel pump 10 from the prior art. At this
  • High-pressure fuel pump 10 is in a housing 12, an axial housing bore 14 is introduced, in which a pump piston 16 with Help a guide sleeve is guided.
  • the housing bore 14 is delimited at a first end region 20 by a sealing arrangement 22, through which the pump piston 16 extends. Since the housing bore 14, the housing 12 is not completely penetrated, the housing bore 14 at a second end region 24 is limited by the housing 12 itself.
  • the sealing arrangement 22 is formed by a combination of a sealing shell 26, which is pressed into the housing bore 14, with a sealing ring 28 which is arranged pressed into a shell portion 30 of the sealing shell 26.
  • the pump piston 16 passes through the sealing ring 28 and is thus in axially movable contact with an inner periphery 32 of the sealing ring 28.
  • the sealing ring 28 is firmly seated in the shell portion 30 and thus is not axially movable on its outer periphery 34.
  • a low-pressure damper 38 is attached to the housing 12.
  • the Never derdruckdämpfer 38 has a damper capsule 40 and is fluidly connected to a fuel inlet 42 via which fuel 44 is supplied from outside the high-pressure fuel pump 10 to a pressure chamber 46.
  • a fuel inlet 42 which is designed as a fuel inlet bore 48
  • an inlet valve 50 is arranged, which is designed as an active valve and is contacted via a plug connection 52.
  • the prior art high-pressure fuel pump 10 shown in FIG. 1 requires a relatively large amount of installation space, in particular due to the low-pressure damper 38 at the head end 36, and additionally has the disadvantage that the plug connection 52 on the inlet valve 50 only at predetermined angles to the inlet valve 50 can be attached. Therefore, an improved high-pressure fuel pump 10 will be described below with reference to FIGS. 2 and 3, in which the low-pressure damper 38 is omitted and replaced by an alternative arrangement.
  • the sealing ring 28 is not fixed in the shell portion 30 is in Fig. 2, but is is in this case a partial view of a longitudinal section of a high-pressure fuel pump 10 of the invention held on its outer circumference 34 axially movable by the sealing shell 26, in particular the shell portion 30.
  • a return element 58 here in the form of a compression spring 60, which applies a spring force 62 on the sealing ring 28.
  • the sealing ring 28 can move axially with its outer circumference 34 on the shell portion 30 along, compress the restoring element 58, and so absorb the pulsations.
  • the sealing ring 28 which had previously taken over only the function of sealing the pump piston 16 as a rod seal, thus assumes together with the return element 58, the previous function of the low-pressure damper 38 and thus dampens the pulsations within the high-pressure fuel pump 10.
  • a piston support element 64 on which the pump piston 16 is supported annularly, is fixed in the blade section 30, and thus delimits the shell part. cut 30 opposite the return element 58 upwards.
  • a leakage discharge device 66 is provided. By means of this leakage discharge device 66, the occurring fuel leakage can then be discharged, for example, into an engine compartment 68.
  • the seal assembly 22 is disposed in a low pressure region 70 of the housing bore 14 and fluidly connected to the fuel inlet 42 (not shown).
  • the seal assembly 22 is disposed in a low pressure region 70 of the housing bore 14 and fluidly connected to the fuel inlet 42 (not shown).
  • the low-pressure damper 38 is no longer arranged at the head end 36 of the high-pressure fuel pump 10, it is possible to introduce the fuel inlet bore 48 coaxially with the housing bore 14 from above into the housing 12. As a result, it is also possible to arrange the inlet valve 50, as shown in FIG. 3, coaxially with the pump piston 16, resulting in a 360 ° free rotation capability of the plug connection 52. As a result, are available for the orientation of the connector terminal 52 from reaching degrees of freedom for connection to the customer.

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

Abstract

L'invention concerne une pompe à carburant haute pression (10) comprenant un alésage (14) ménagé dans un corps (12), lequel est délimité par un système d'étanchéité (22), ce système d'étanchéité (22) comprenant une bague d'étanchéité (28) axialement mobile et un élément de rappel (58) qui applique une force élastique axiale (62) sur la bague d'étanchéité (28).
PCT/EP2019/050217 2018-01-08 2019-01-07 Pompe à carburant haute pression pour système d'injection de carburant WO2019134990A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018200146.4 2018-01-08
DE102018200146.4A DE102018200146B4 (de) 2018-01-08 2018-01-08 Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem

Publications (1)

Publication Number Publication Date
WO2019134990A1 true WO2019134990A1 (fr) 2019-07-11

Family

ID=65003402

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/050217 WO2019134990A1 (fr) 2018-01-08 2019-01-07 Pompe à carburant haute pression pour système d'injection de carburant

Country Status (2)

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DE (1) DE102018200146B4 (fr)
WO (1) WO2019134990A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020214037A1 (de) * 2020-04-03 2021-10-07 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoff-Hochdruckpumpe

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1746281A2 (fr) * 2005-07-20 2007-01-24 Robert Bosch Gmbh Arrangement avec un circuit magnétique avec un connecteur orientable radialement
US20090297375A1 (en) * 2008-05-30 2009-12-03 Denso Corporation Electromagnetic valve, fluid pump having the valve, and fluid injector having the valve
DE102014213715A1 (de) * 2014-07-15 2016-01-21 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE102015219772A1 (de) 2015-10-13 2016-10-06 Continental Automotive Gmbh Niederdruckdämpfer sowie Kraftstoffhochdruckpumpe
DE102015214812A1 (de) 2015-08-04 2017-02-09 Continental Automotive Gmbh Kraftstoffhochdruckpumpe
WO2017121578A1 (fr) * 2016-01-12 2017-07-20 Continental Automotive Gmbh Système d'injection de carburant
DE102016211245A1 (de) * 2016-06-23 2017-12-28 Robert Bosch Gmbh Kolben-Fluidpumpe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6086070A (en) * 1997-09-18 2000-07-11 Flow International Corporation High pressure fluid seal assembly
JP3471587B2 (ja) * 1997-10-27 2003-12-02 三菱電機株式会社 筒内噴射用高圧燃料ポンプ
DE10327408B4 (de) * 2002-10-19 2017-10-26 Robert Bosch Gmbh Vorrichtung zum Dämpfen von Druckpulsationen in einem Kraftstoffsystem einer Brennkraftmaschine
IT1396142B1 (it) * 2009-11-03 2012-11-16 Magneti Marelli Spa Pompa carburante con dispositivo smorzatore perfezionato per un sistema di iniezione diretta

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1746281A2 (fr) * 2005-07-20 2007-01-24 Robert Bosch Gmbh Arrangement avec un circuit magnétique avec un connecteur orientable radialement
US20090297375A1 (en) * 2008-05-30 2009-12-03 Denso Corporation Electromagnetic valve, fluid pump having the valve, and fluid injector having the valve
DE102014213715A1 (de) * 2014-07-15 2016-01-21 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE102015214812A1 (de) 2015-08-04 2017-02-09 Continental Automotive Gmbh Kraftstoffhochdruckpumpe
DE102015219772A1 (de) 2015-10-13 2016-10-06 Continental Automotive Gmbh Niederdruckdämpfer sowie Kraftstoffhochdruckpumpe
WO2017121578A1 (fr) * 2016-01-12 2017-07-20 Continental Automotive Gmbh Système d'injection de carburant
DE102016211245A1 (de) * 2016-06-23 2017-12-28 Robert Bosch Gmbh Kolben-Fluidpumpe

Also Published As

Publication number Publication date
DE102018200146A1 (de) 2019-07-11
DE102018200146B4 (de) 2019-11-28

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