WO2019233666A1 - Pompe haute pression à piston pour carburant - Google Patents

Pompe haute pression à piston pour carburant Download PDF

Info

Publication number
WO2019233666A1
WO2019233666A1 PCT/EP2019/059763 EP2019059763W WO2019233666A1 WO 2019233666 A1 WO2019233666 A1 WO 2019233666A1 EP 2019059763 W EP2019059763 W EP 2019059763W WO 2019233666 A1 WO2019233666 A1 WO 2019233666A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
pump
throttle
piston pump
chamber
Prior art date
Application number
PCT/EP2019/059763
Other languages
German (de)
English (en)
Inventor
Aleksej MIEL
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 WO2019233666A1 publication Critical patent/WO2019233666A1/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
    • F02M59/46—Valves
    • 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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • F02M63/005—Pressure relief valves
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a high-pressure fuel piston pump for a
  • Fuel system for an internal combustion engine with one by one
  • the function of the pressure relief valve is to avoid or reduce unacceptably high pressures in the area of the outlet. While it is closed during normal operation, it opens when there are impermissibly high pressures in the area of the outlet.
  • the outflow region of the pressure limiting valve is then fluidly connected to the delivery chamber of the high-pressure fuel piston pump.
  • the invention is based on the observation of the inventors that during the suction phase of the high-pressure fuel piston pump, so if the delivery chamber by a downward movement of the pump piston increases and thus a negative pressure in the delivery chamber and the outflow of the pressure relief valve micro-openings of the pressure limiting valve can occur, even if the pressure in the region of the outlet, that is, in the high-pressure region of the fuel system, is actually in the permissible range, an opening of the
  • micro-openings there is a return flow of the compressed fuel from the high pressure region into the delivery chamber, so that the delivery rate of the pump is reduced.
  • the wear and the acoustic emission of the pressure relief valve is increased by the occurrence of micro-openings.
  • the delivery rate of the pump is increased and wear and acoustic emission of the pump are reduced.
  • the throttle separates the fluidic connection
  • Pressure limiting space and pumping chamber as much as possible (the largest possible flow resistance, as small as possible minimum flow diameter of the throttle), but this only in the context in which the actual function of the pressure relief valve to reduce unacceptably high pressures in the high pressure region of the fuel system is sufficiently maintained.
  • Flow diameter which is not greater than 2.5 mm and / or not less than 25% of a maximum diameter of the pump piston.
  • Flow diameter which is not less than 0.7 mm and / or not less than 7% of a maximum diameter of the pump piston.
  • Flow diameter which is not less than 0.5 mm and / or not less than 5% of a maximum diameter of the pump piston.
  • the throttle can be formed directly by appropriate machining of a housing of the high pressure fuel pump. Alternatively, it is possible that the throttle is formed in a diaphragm part which is connected to the housing of the high-pressure fuel piston pump, in particular in a bore of the housing of the high-pressure fuel piston pump is pressed.
  • Figure 1 is a schematic representation of a fuel system for a
  • FIG. 2 shows a longitudinal section through the partial region of a fuel high-pressure pump of the fuel system of FIG. 1 which is essential for the invention
  • FIG. 1 shows a fuel system 10 for a further not shown
  • a quantity control valve 24 which can be actuated by an electromagnetic actuating device 22 to a delivery chamber 26 of a high-pressure fuel pump 28.
  • the quantity control valve 24 may be a forcibly opening inlet valve of the high-pressure fuel pump 28.
  • the high-pressure fuel pump 28 is designed as a piston pump, wherein a piston 30 can be moved vertically by means of a cam 32 in the drawing. Hydraulically between the delivery chamber 26 and an outlet 36 of the high-pressure fuel pump 28 is drawn in the Figure 1 as a spring-loaded check valve drawn outlet valve 40 and also designed as a spring-loaded check valve pressure relief valve 42. Between the pressure relief valve 42 and the delivery chamber 26 further pressure limiting chamber 47 is arranged, which is separated from the delivery chamber 26 by a throttle 45. The outlet 36 is connected to a high pressure line 44 and via this to a high-pressure accumulator 46 ("common rail”)
  • the exhaust valve 40 may open to the outlet 36 and the pressure relief valve 42 pressure limiting chamber 47 out.
  • Actuator 22 is driven by a control and / or regulating device 48.
  • the prefeed pump 16 delivers fuel from the fuel tank 12 into the low pressure line 18.
  • the quantity control valve 24 may be closed and opened in response to a respective demand for fuel. As a result, the amount of fuel delivered to the high-pressure accumulator 46 is influenced. Normally, the pressure relief valve 42 is closed.
  • a fuel pressure in the high-pressure line 44 is higher than a fuel pressure in a region of the delivery chamber 26 (plus a spring force of a valve spring 60 of the
  • FIG. 2 shows a longitudinal section through the partial region, which is essential for the invention, of a high-pressure fuel piston pump 28 of the fuel system of FIG. 1.
  • Outlet 36 'formed space 37, the outlet valve 40 and the pressure relief valve 42 are introduced with mutually opposite opening direction in parallel bores of the pump housing 50.
  • the pressure limiting chamber 47 is arranged between the pressure relief valve 42 and the delivery chamber 26, which in turn by the throttle 45 is separated from the delivery chamber 26.
  • the delivery chamber 26 is limited in the example below by the pump piston, the maximum
  • the throttle 45 is in the example by pressing a diaphragm member 45 'in a bore of the housing 50 of
  • Fuel high pressure piston pump 28 made. However, it is alternatively also possible to produce the throttle 45 directly by machining the housing 50 of the high-pressure fuel piston pump.
  • the aperture 45 ' of Figure 2 is shown enlarged in the figure 3a. It has a double-conical shape. The narrowest flow diameter is 0.8 mm, the cone angle a is 40 ° in the example.
  • FIG. 3d An alternative diaphragm 45 'or throttle 45 is shown in FIG. 3d. It is cylindrical with a diameter of 1, 2mm and has a length of 2mm.

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

Pompe haute pression à piston pour carburant (28) pour un système de carburant (10) pour un moteur à combustion interne, avec une chambre de refoulement (26), délimitée par un piston de pompe (30) disposé de manière coulissante dans la pompe haute pression à piston pour carburant (28), et une soupape d'entrée (24), disposée hydrauliquement entre la chambre de refoulement (26) et une entrée (20) et s'ouvrant vers la chambre de refoulement (26), et une soupape de sortie (40), disposée hydrauliquement entre la chambre de refoulement (26) et une sortie (36) et s'ouvrant vers la sortie (36), et une soupape de surpression (42), disposée hydrauliquement entre la sortie (36) et la chambre de refoulement (26) et s'ouvrant vers la chambre de refoulement (26), caractérisée en ce qu'une chambre de surpression (47) est disposée fluidiquement entre la soupape de surpression (42) et la chambre de refoulement (26), laquelle est séparée de la chambre de refoulement (26) par un étrangleur (45).
PCT/EP2019/059763 2018-06-07 2019-04-16 Pompe haute pression à piston pour carburant WO2019233666A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018209033.5A DE102018209033A1 (de) 2018-06-07 2018-06-07 Kraftstoff-Hochdruckkolbenpumpe
DE102018209033.5 2018-06-07

Publications (1)

Publication Number Publication Date
WO2019233666A1 true WO2019233666A1 (fr) 2019-12-12

Family

ID=66218113

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/059763 WO2019233666A1 (fr) 2018-06-07 2019-04-16 Pompe haute pression à piston pour carburant

Country Status (2)

Country Link
DE (1) DE102018209033A1 (fr)
WO (1) WO2019233666A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021203663A1 (de) 2021-04-14 2022-10-20 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoff-Hochdruckpumpe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3424401A1 (de) * 1984-07-03 1986-01-09 Robert Bosch Gmbh, 7000 Stuttgart Gleichdruckventil fuer kraftstoffeinspritzpumpen
DE4216068A1 (de) * 1992-05-15 1993-11-18 Bosch Gmbh Robert Gleichdruckventil
WO2009063306A1 (fr) * 2007-11-16 2009-05-22 Toyota Jidosha Kabushiki Kaisha Appareil d'alimentation en carburant haute pression pour moteur à combustion interne
DE102004013307B4 (de) 2004-03-17 2012-12-06 Robert Bosch Gmbh Kraftstoffhochdruckpumpe mit einem Druckbegrenzungsventil
DE102016213139A1 (de) * 2016-07-19 2018-01-25 Robert Bosch Gmbh Kraftstoffhochdruckpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3424401A1 (de) * 1984-07-03 1986-01-09 Robert Bosch Gmbh, 7000 Stuttgart Gleichdruckventil fuer kraftstoffeinspritzpumpen
DE4216068A1 (de) * 1992-05-15 1993-11-18 Bosch Gmbh Robert Gleichdruckventil
DE102004013307B4 (de) 2004-03-17 2012-12-06 Robert Bosch Gmbh Kraftstoffhochdruckpumpe mit einem Druckbegrenzungsventil
WO2009063306A1 (fr) * 2007-11-16 2009-05-22 Toyota Jidosha Kabushiki Kaisha Appareil d'alimentation en carburant haute pression pour moteur à combustion interne
DE102016213139A1 (de) * 2016-07-19 2018-01-25 Robert Bosch Gmbh Kraftstoffhochdruckpumpe

Also Published As

Publication number Publication date
DE102018209033A1 (de) 2019-12-12

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