EP3599371A1 - Pumpeinheit für die kraftstoffzufuhr, vorzugsweise diesel, an einen verbrennungsmotor - Google Patents

Pumpeinheit für die kraftstoffzufuhr, vorzugsweise diesel, an einen verbrennungsmotor Download PDF

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Publication number
EP3599371A1
EP3599371A1 EP19185943.8A EP19185943A EP3599371A1 EP 3599371 A1 EP3599371 A1 EP 3599371A1 EP 19185943 A EP19185943 A EP 19185943A EP 3599371 A1 EP3599371 A1 EP 3599371A1
Authority
EP
European Patent Office
Prior art keywords
pumping unit
fuel
support housing
unit according
valve
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Withdrawn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
EP19185943.8A
Other languages
English (en)
French (fr)
Inventor
Francesco Rizzi
Ruggiero Gissi
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.)
Robert Bosch GmbH
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 EP3599371A1 publication Critical patent/EP3599371A1/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Withdrawn legal-status Critical Current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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0017—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor related to fuel pipes or their connections, e.g. joints or sealings
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0041—Means for damping pressure pulsations
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of 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
    • 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
    • F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
    • 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
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0028—Valves characterised by the valve actuating means hydraulic
    • 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
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0043—Two-way 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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
    • F02M2200/855—Mounting of fuel injection apparatus using clamp elements or fastening means, e.g. bolts or screws

Definitions

  • the present invention relates to a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • the present invention relates to a pumping unit of the type comprising a high-pressure pump, for example a piston pump, designed to feed the fuel to an internal combustion engine; a low-pressure or pre-feed pump, for example a gear pump, designed to feed the fuel from a storage tank to the high-pressure pump; and a hydraulic circuit for connecting together the storage tank, the pre-feed pump, the high-pressure pump and the internal combustion engine.
  • a high-pressure pump for example a piston pump
  • a low-pressure or pre-feed pump for example a gear pump, designed to feed the fuel from a storage tank to the high-pressure pump
  • a hydraulic circuit for connecting together the storage tank, the pre-feed pump, the high-pressure pump and the internal combustion engine.
  • the hydraulic circuit is provided with a valve unit comprising a support housing, an electric metering valve for controlling feeding of the fuel to the high-pressure pump, and an overflow valve for discharging into the storage tank or into the hydraulic circuit at least part of the fuel flow in excess of that fed through the said electric metering valve.
  • the electric metering valve comprises a first closing member mounted inside the support housing so as to be displaceable between a respective open position and a respective closed position in a first direction of movement; a spring for displacing, and normally keeping, the first closing member in its open position; and an electromagnetic actuator for displacing the first closing member from its open position into its closed position.
  • the overflow valve is provided with a second closing member mounted inside the support housing so as to be displaceable between a respective open position and a respective closed position in a second direction of movement substantially parallel to the first direction of movement.
  • the valve unit further comprises a first set of clamping screws for fixing the electromagnetic actuator on the support housing and second set of clamping screws for fixing the support housing on the internal combustion engine.
  • the pumping unit comprises, finally, three hydraulic connectors which are fixed by means of an interference fit inside the support housing and one of which is an inlet connector for entry of the fuel into the electric metering valve, one is an outlet connector for exiting of the fuel from the electric metering valve, and one is an outlet connector for exiting of the fuel from the overflow valve.
  • the known pumping units of the type described above have a number of drawbacks mainly due to the fact that the support housing - and therefore the valve unit - have relatively large dimensions and are therefore relatively costly.
  • the object of the present invention is to provide a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and is simple and inexpensive to produce.
  • a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in the accompanying claims.
  • 1 denotes in its entirety a pumping unit for feeding fuel, preferably diesel fuel, from a storage tank 2 to an internal combustion engine 3, in the case in question a diesel combustion engine.
  • fuel preferably diesel fuel
  • the engine 3 comprises a header 4 for distribution of the fuel, commonly referred to by the term “common rail”, and a plurality of injectors 5 connected to the header 4 and designed to atomize the fuel inside associated combustion chambers (not shown) of said engine 3.
  • the pumping unit 1 comprises a high-pressure pump 6 of the known type, for example a piston pump, for feeding the fuel to the engine 3; and a low-pressure or pre-feed pump 7 of the known type, for example a gear pump, for feeding the fuel from the tank 2 to the pump 6.
  • a high-pressure pump 6 of the known type for example a piston pump
  • a low-pressure or pre-feed pump 7 of the known type for example a gear pump
  • the pumping unit 1 further comprises a hydraulic circuit 8 comprising, in turn, a first line 9 for connecting together the tank 2 and the pump 7; a second line 10 for connecting together the pump 7 and the pump 6; and a third line 11 for connecting together the pump 6 and the header 4.
  • the line 10 is provided with a filtering device 12 for filtering the fuel fed to the pump 6 and a valve unit 13 mounted downstream of the device 12 in a direction 14 of feeding of the fuel along the said line 10.
  • valve unit 13 comprises a support housing 15 which is made of plastic material and is bounded by two larger substantially flat faces 16 parallel to each other.
  • the housing 15 is provided with a first cavity 17 which has a longitudinal axis 18 substantially perpendicular to the faces 16 and which opens out on one of the said faces 16.
  • the housing 15 has moreover a second cavity 19 which has a longitudinal axis 20 transverse to the axis 18, opens out on a side face 21 of the housing 15 and communicates with the cavity 17.
  • the valve unit 13 further comprises an electric metering valve 22 for selectively controlling the instantaneous flowrate of fuel fed to the pump 6 depending on the values of a plurality of operating parameters of the engine 3 and an overflow valve 23 for discharging into the tank 2 at least part of the fuel flow in excess of that fed through the said electric metering valve 22.
  • the electric metering valve 22 comprises a valve body 24 with a tubular shape, which is mounted inside the cavity 17 coaxially with the axis 18, and has a plurality of inlet holes 25 which are distributed around the axis 18 and allow the entry of the fuel into the said valve body 24.
  • the valve body 24 is slidably engaged by a closing member 26 which has a cup-shaped form and is provided with a plurality of feed holes 27 which are distributed around the axis 18 and are formed through a side wall of the said closing member 26.
  • the closing member 26 is movable in a direction A of movement parallel to the axis 18, between an open position, where the holes 27 are situated radially facing the holes 25, and a closed position, where the holes 27 are axially offset with respect to the said holes 25.
  • the closing member 26 is displaced, and normally kept, in its open position by a spring 28 arranged between the closing member 26 and a stop ring 29, which is fixed to a free end of the valve body 24 and is configured to allow fuel to be discharged from the electric metering valve 22.
  • the closing member 26 is displaced from its open position into its closed position against the action of the spring 28 by an electromagnetic actuator 30 comprising a cup-shaped body 31 mounted on the valve body 24 coaxially with the axis 18.
  • the actuator 30 further comprise an actuating armature 32 which is made of ferromagnetic material, is slidably mounted inside the cup-shaped body 31 and is arranged in contact with an end wall of the closing member 26.
  • the actuator 30 further comprises an electric circuit 33 which extends around the armature 32 and along the axis 18 and is electrically energized so as to displace the armature 32 against the action of the spring 28.
  • the valve unit 13 further comprises a plurality of clamping screws 34, each of which is configured to be screwed into a support frame (known and not shown) of the engine 3 and to fix the cup-shaped body 31 on the housing 15 and the housing 15 on the support frame (not shown) of the said engine 3.
  • the valve unit 13 also has a hydraulic inlet connector 35 for entry of the fuel into the electric valve 22 and a hydraulic outlet connector 36 for exiting of the fuel from the said electric valve 22.
  • the connectors 35, 36 are made as one piece with the housing 15 and have respective longitudinal axes 37, 38 transverse to the axis 18.
  • the axes 20 and 37 are substantially coplanar with a containing plane substantially perpendicular to the axis 18 and substantially parallel to the axis 38.
  • the overflow valve 23 comprises a tubular shaped valve body 39 which is mounted inside the cavity 19 coaxially with the axis 20 and is coupled with the cavity 19 in a fluid-tight manner via an annular seal 40 mounted on a free end of the said valve body 39.
  • the valve body 39 has, in this case, two engaging teeth 41 which are uniformly distributed around the axis 20 and project radially outwards from the valve 39 so as to engage slidably inside the cavity 19.
  • the valve body 39 is also provided with a plurality of outlet holes 42, which are distributed around the axis 20 and allow the fuel to exit the said valve body 39.
  • the valve body 39 is slidably coupled with the cavity 19 and is axially locked in position along the cavity 19 by a hydraulic connector 43 which is fixed by means of an interference fit inside the said cavity 19.
  • the valve body 39 is slidably coupled with a closing member 44 which has a cup-shaped form and is movable in a direction B of movement parallel to the axis 20 between a position for opening and a position for closing the holes 42.
  • the closing member 44 is displaced, and normally kept, in its closed position by a spring 45 arranged between an end wall of the closing member 44 and a stop plate 46 mounted inside the valve body 39 transversely with respect to the axis 20.
  • the end wall of the closing member 44 and the plate 46 are provided with respective calibrated holes 47 formed coaxially with the axis 20 and configured to regulate the pressure of the fuel inside the valve body 39 so as to dampen the oscillations of the said closing member 44.
  • valve unit 13 Since the axes 20, 37 and 38 are arranged transversely with respect to the axis 18, the valve unit 13 has relatively small axial dimensions measured parallel to said axis 18.
  • valve unit 13 offers also further advantages due mainly to the fact that:

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP19185943.8A 2018-07-24 2019-07-12 Pumpeinheit für die kraftstoffzufuhr, vorzugsweise diesel, an einen verbrennungsmotor Withdrawn EP3599371A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102018000007469A IT201800007469A1 (it) 2018-07-24 2018-07-24 Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna

Publications (1)

Publication Number Publication Date
EP3599371A1 true EP3599371A1 (de) 2020-01-29

Family

ID=63965789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19185943.8A Withdrawn EP3599371A1 (de) 2018-07-24 2019-07-12 Pumpeinheit für die kraftstoffzufuhr, vorzugsweise diesel, an einen verbrennungsmotor

Country Status (2)

Country Link
EP (1) EP3599371A1 (de)
IT (1) IT201800007469A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5626121A (en) * 1994-12-02 1997-05-06 Zexel Corporation Fuel pump for high-pressure fuel injection system
US20010032618A1 (en) * 2000-04-20 2001-10-25 The Rexroth Corporation Pilot operated throttling valve for constant flow pump
DE102014223240A1 (de) * 2014-11-14 2016-05-19 Robert Bosch Gmbh Niederdruckregelsystem einer Kraftstofffördereinrichtung eines Kraftstoffeinspritzsystems sowie ein Absteuerventil dazu

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5626121A (en) * 1994-12-02 1997-05-06 Zexel Corporation Fuel pump for high-pressure fuel injection system
US20010032618A1 (en) * 2000-04-20 2001-10-25 The Rexroth Corporation Pilot operated throttling valve for constant flow pump
DE102014223240A1 (de) * 2014-11-14 2016-05-19 Robert Bosch Gmbh Niederdruckregelsystem einer Kraftstofffördereinrichtung eines Kraftstoffeinspritzsystems sowie ein Absteuerventil dazu

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Publication number Publication date
IT201800007469A1 (it) 2020-01-24

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