WO2021028170A1 - Pompe à carburant à haute pression - Google Patents

Pompe à carburant à haute pression Download PDF

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Publication number
WO2021028170A1
WO2021028170A1 PCT/EP2020/070632 EP2020070632W WO2021028170A1 WO 2021028170 A1 WO2021028170 A1 WO 2021028170A1 EP 2020070632 W EP2020070632 W EP 2020070632W WO 2021028170 A1 WO2021028170 A1 WO 2021028170A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
fuel pump
area
pressure fuel
region
Prior art date
Application number
PCT/EP2020/070632
Other languages
German (de)
English (en)
Inventor
Daniel Beckmann
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
Publication of WO2021028170A1 publication Critical patent/WO2021028170A1/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
    • 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
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M59/445—Selection of particular materials
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering

Definitions

  • the invention relates to a high-pressure fuel pump according to the preamble of claim 1.
  • DE 102015219 537 A1 describes a high-pressure fuel pump that is used in a fuel system of an internal combustion engine. With it, the fuel is compressed to a very high pressure in order to then be injected directly into the combustion chambers of the internal combustion engine by means of injectors.
  • the known high-pressure fuel pump is a piston pump, the delivery rate of which can be influenced by a quantity control valve on the inlet side. This results in pressure pulsations in a low-pressure area on the inlet side, which are reduced by a pressure pulsation damper arranged there.
  • This comprises a diaphragm box with, for example, two diaphragms which are essentially arranged approximately parallel to one another and which are welded to one another at the edges.
  • the high-pressure fuel pump according to the invention comprises a low-pressure area and a pressure pulsation damper arranged in the low-pressure area.
  • the term “low pressure area” refers to an inlet-side area before the fuel is compressed.
  • the pressure pulsation damper comprises at least one diaphragm box. This can be arranged, for example, in a fluid space that is delimited by a housing cover of the high-pressure fuel pump.
  • the diaphragm can preferably has two membranes, which can be arranged in mirror image to one another, for example, and between which an interior of the pressure pulsation damper is formed, which is delimited by these membranes.
  • the interior can be filled, for example, with a compressible gaseous fluid (for example air or nitrogen), so that under certain external conditions a certain pressure prevails in the interior.
  • a compressible gaseous fluid for example air or nitrogen
  • at least one of the diaphragms has a different material property in a radially inward area than in a radially outward area.
  • material property is not understood here to mean the geometric shape, but rather a material characteristic value that influences the rigidity or softness of the material.
  • the invention uses the knowledge that a damping characteristic curve of the pressure pulsation damper depends essentially on the geometric configuration and on the material properties of the membranes.
  • the damping characteristic links the damping of pressure pulsations that can be achieved by the pressure pulsation damper with the fluid pressure outside of the diaphragm box, i.e. with the high pressure fuel pump that is used here, the fuel pressure (“pre-pressure”) in the low pressure range.
  • a progressive interpretation of the damping characteristic can thus take place.
  • a comparatively high admission pressure a comparatively high flexibility of the membrane can be realized, which has the consequence that a pressure range of the admission pressure is expanded.
  • the result is improved pressure damping at higher pre-pressures, which improves the acoustics of the high-pressure fuel pump according to the invention.
  • the pre-pressure can be reduced overall, which saves energy, which can ultimately lead to CO2 savings.
  • the material in the radially inward area has a higher modulus of elasticity and / or a greater thickness than in a radially outward area. Since the radially inward area, that is to say the center, of a membrane, for example designed as a kind of circular half-shell, is more rigid than the radial one external area, that is to say the edge area, a softer material or a smaller thickness can be selected in the radially inward area in order to achieve greater flexibility here. This higher resilience leads to a spreading of the damping area, that is to say that pressure area in which a comparatively high level of damping can be achieved by the pressure pulsation damper.
  • the different material properties are at least also provided by different materials.
  • very different material properties can also be provided.
  • different steels can be used. It is only important that the different materials can be connected to one another permanently and in a fluid-tight manner.
  • the different material properties are provided by locally different post-treatment of the same material. Problems of sealing and the fatigue strength of the connection between the radially inward and radially outward area are avoided in this way.
  • the aftertreatment can include thermal and / or chemical aftertreatment, which can be easily implemented.
  • the radially inward area of the membrane is welded to the radially outward area of the membrane. This is a simple, fluid-tight and durable type of connection, especially when using different materials for the radially inward and radially outward area.
  • a value of a pressure in the interior of the diaphragm can be changed, preferably reduced, compared to a value of the pressure in the interior of a diaphragm can with membranes with uniform material properties under the same operating conditions. This allows a specific adaptation of the damping to a very specific area of application.
  • FIG. 1 shows a schematic representation of a fuel system of an internal combustion engine with a high-pressure fuel pump
  • FIG. 2 shows a partial longitudinal section through a region of the high-pressure fuel pump from FIG. 1;
  • FIG. 3 shows a sectional view through a diaphragm box of a
  • FIG. 4 shows a detail IV from FIG. 3
  • FIG. 5 shows a diagram in which damping of pressure pulsations is plotted against a pressure in a low-pressure region of the high-pressure fuel pump for different pressure pulsation dampers (damping characteristic).
  • a fuel system bears the overall reference number 10. It is used to provide fuel for an internal combustion engine, not shown further, in a very simplified schematic representation.
  • a quantity control valve 24 which can be actuated by an electromagnetic actuator 22, to a working chamber 26 of a high-pressure fuel pump 28, for example with one provided by the pre-feed pump 16 Pre-pressure of 4-8 bar, especially about 6 bar.
  • the quantity control valve 24 can be a positively openable inlet valve of the high-pressure fuel pump 28.
  • a piston 30 of the high-pressure fuel pump 28 can be moved vertically by means of a cam disk 32 in the drawing.
  • An outlet valve 36 shown as a spring-loaded check valve, and a pressure-limiting valve 38, also shown as a spring-loaded check valve, are arranged hydraulically between the working chamber 26 and an outlet 34 of the high-pressure fuel pump 28.
  • the outlet 34 is connected to a high pressure accumulator 42 (“common rail”) via a high pressure line 40.
  • the prefeed pump 16 conveys fuel from the fuel tank 12 into the low-pressure line 18.
  • the quantity control valve 24 can be closed and opened as a function of a particular demand for fuel. This influences the amount of fuel delivered to the high-pressure accumulator 42.
  • a pressure pulsation damper 44 is arranged there.
  • the high-pressure fuel pump 28 comprises a pump housing 46 which is essentially cylindrical or rotationally symmetrical in shape. In the upper area of the pump housing 46 in FIG. 2, it has an end face 48 on which a hood-like housing cover 50 is placed, which is connected to the pump housing 46 in a fluid-tight manner, for example welded.
  • a fluid space 52 is formed between the end face 48 and the housing cover 50 and is connected to the low-pressure region 43 via a channel 54.
  • the above-mentioned pressure pulsation damper 44 which in the present case comprises a diaphragm box 56, is arranged in the fluid space 52.
  • the diaphragm box 56 in turn comprises in the present case two diaphragms 58a and 58b which are essentially identical to one another and are arranged in mirror image, which in the top view have an essentially circular contour and are designed to be rotationally symmetrical.
  • the two membranes 58a and 58b are welded to one another in a fluid-tight manner at their radially outer edge (reference numeral 60).
  • the diaphragm box 56 is held in a press fit in the fluid space 52 by a holder 62.
  • An interior space 64 is formed between the two membranes 58a and 58b. This is therefore limited by the two membranes 58a and 58b.
  • This interior space 64 is filled with a gas, for example nitrogen or air, specifically at a specific pressure. This will be discussed in greater detail below.
  • the diaphragm 58a has a radially inward region 66 which quasi forms the “center” of the diaphragm 58a. Radially outside, the radially inward area 66 is adjoined by a radially outward area 68, which thus quasi forms the “edge area” of the membrane 58a.
  • the radially inward area 66 has a different material property than the radially outward area 68. In the present case, this is realized in that the radially inward area 66 is made of a different material, for example a different steel, than the radially outward area 68.
  • the radially outward region 68 and the radially inward region 66 are welded to one another (reference numeral 70, see also FIG. 4).
  • the material of the radially inward region 66 is softer than that of the radially outward region 68, that is to say it has a smaller modulus of elasticity than the radially outward region 68, which results in greater flexibility.
  • the radially inward area could be made of the same material as the radially outward area, but have a smaller thickness. It would also be possible for the different material properties to be provided by locally different post-treatment, for example thermal and / or chemical post-treatment.
  • a damping D is plotted against a pressure P in the low-pressure region 45 for different configurations of the membranes 58a and 58b (“damping characteristic”). Damping D can be understood, for example, as a ratio of a pressure peak occurring in the low-pressure region 45 in a high-pressure fuel pump 28 without a pressure pulsation damper 44 to a pressure peak occurring in the high-pressure region 45 in a high-pressure fuel pump 28 with a pressure pulsation damper 44.
  • a solid line 72 describes a relationship for a conventional pressure pulsation damper, the membranes of which have uniform material properties and the interior 64 of which has a specific internal pressure at a defined external pressure.
  • a dashed line 74 describes the relationship for the pressure pulsation damper 44 shown in FIGS. 2-4, with this at the defined external pressure has the same specific internal pressure as the conventional pressure pulsation damper.
  • a dot-dash line 76 describes the relationship for the pressure pulsation damper 44 shown in FIGS. 2-4, this having a lower internal pressure than the conventional pressure pulsation damper at the defined external pressure.
  • a pressure area 78 (“damping area”), in which a certain damping D1 can be provided, is significantly larger than a pressure area 80 in a conventional pressure pulsation damper.
  • the higher resilience provided by the softer, radially inward region 66 thus leads to a “spreading” of the damping region.
  • membranes are also conceivable in which more than two areas with different material properties are used.
  • a membrane could also have an annular area or several annular areas with material properties that differ from neighboring annular areas.

Landscapes

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

Abstract

L'invention concerne une pompe à carburant haute pression (28) comprenant une zone basse pression (43) et un amortisseur de pulsation de pression (44) disposé dans la zone basse pression (43), l'amortisseur de pulsations de pression (44) comprenant au moins une capsule de diaphragme (56) ayant deux membranes (58a, 58b) qui délimitent un espace intérieur (64) de l'amortisseur de pulsation de pression (44). Selon l'invention, au moins l'un des diaphragmes (58a, 58b) présente, dans une zone radialement vers l'intérieur (66), une propriété de matériau qui diffère de celle dans une zone radialement vers l'extérieur (68).
PCT/EP2020/070632 2019-08-09 2020-07-22 Pompe à carburant à haute pression WO2021028170A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019212008.3 2019-08-09
DE102019212008.3A DE102019212008A1 (de) 2019-08-09 2019-08-09 Kraftstoff-Hochdruckpumpe

Publications (1)

Publication Number Publication Date
WO2021028170A1 true WO2021028170A1 (fr) 2021-02-18

Family

ID=71784038

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/070632 WO2021028170A1 (fr) 2019-08-09 2020-07-22 Pompe à carburant à haute pression

Country Status (2)

Country Link
DE (1) DE102019212008A1 (fr)
WO (1) WO2021028170A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2385241A1 (fr) * 2010-05-04 2011-11-09 Continental Automotive GmbH Amortisseur de pulsation
US20160169173A1 (en) * 2013-07-23 2016-06-16 Toyota Jidosha Kabushiki Kaisha Pulsation damper and high-pressure fuel pump
DE102015219537A1 (de) 2015-10-08 2017-04-27 Robert Bosch Gmbh Membrandose zum Dämpfen von Druckpulsationen in einem Niederdruckbereich einer Kolbenpumpe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2385241A1 (fr) * 2010-05-04 2011-11-09 Continental Automotive GmbH Amortisseur de pulsation
US20160169173A1 (en) * 2013-07-23 2016-06-16 Toyota Jidosha Kabushiki Kaisha Pulsation damper and high-pressure fuel pump
DE102015219537A1 (de) 2015-10-08 2017-04-27 Robert Bosch Gmbh Membrandose zum Dämpfen von Druckpulsationen in einem Niederdruckbereich einer Kolbenpumpe

Also Published As

Publication number Publication date
DE102019212008A1 (de) 2021-02-11

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