EP3158185A1 - Pompe à carburant à haute pression pour système de carburant d'un moteur à combustion interne - Google Patents

Pompe à carburant à haute pression pour système de carburant d'un moteur à combustion interne

Info

Publication number
EP3158185A1
EP3158185A1 EP15720091.6A EP15720091A EP3158185A1 EP 3158185 A1 EP3158185 A1 EP 3158185A1 EP 15720091 A EP15720091 A EP 15720091A EP 3158185 A1 EP3158185 A1 EP 3158185A1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
closing
fuel pump
housing
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.)
Granted
Application number
EP15720091.6A
Other languages
German (de)
English (en)
Other versions
EP3158185B1 (fr
Inventor
Michael Kleindl
Peter ANDRETZKY
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 EP3158185A1 publication Critical patent/EP3158185A1/fr
Application granted granted Critical
Publication of EP3158185B1 publication Critical patent/EP3158185B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/0215—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits
    • 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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and 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
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
    • 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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring

Definitions

  • the invention relates to a high-pressure fuel pump according to the preamble of claim 1, and a pressure relief valve according to the independent claim.
  • a high-pressure fuel pump fuel from a low pressure region, for example, downstream of a feed pump, in a
  • High pressure range in particular in a high-pressure accumulator (Rail) promote.
  • high-pressure fuel pumps often have a pressure relief valve, which can limit a fuel pressure in the high pressure region to a predetermined maximum value.
  • a pressure relief valve which can limit a fuel pressure in the high pressure region to a predetermined maximum value.
  • Fuel system can be prevented.
  • the invention relates to a fuel high-pressure pump for a fuel system for an internal combustion engine, having a pressure-limiting valve arranged hydraulically between an outlet and an area upstream of the outlet in a housing and opening to the upstream area, which has a closing element which extends from a valve spring into
  • Closing direction is applied, and has a stopper body which limits the maximum opening travel of the closing element.
  • the stop body is supported axially on the housing and is acted upon by the valve spring against the housing.
  • the pressure limiting valve according to the invention can be produced and mounted in a particularly simple manner, whereby costs can be saved.
  • the stop body is solid. As a result, the stopper body can transmit comparatively large forces and yet be manufactured simply and cheaply.
  • - but not mandatory - is the stop body of a
  • a closing body is arranged between the closing element and the valve spring, which cooperates with the stop body and which preferably - but not necessarily - is made massive.
  • a force exerted by the valve spring can be transmitted in a defined manner to the closing element, whereby the function of the pressure-limiting valve can be improved.
  • an end portion of the closing body and / or an end portion of the stopper body are made plate-shaped / is, wherein an outer diameter of the end portion is larger than a
  • the pressure limiting valve can be made particularly simple, cheap and at the same time robust.
  • a guide portion of the closing body and / or a guide portion of the stopper body are designed peg-shaped / is, wherein an outer diameter of the respective guide portion is smaller than an inner diameter of the valve spring.
  • Pressure relief valve comparatively few and easy to manufacture components, which can be easily arranged in the housing, without additional connection techniques are required.
  • the high-pressure fuel pump can be further simplified and cheapened when the closing body and the stopper body are made at least substantially identical, wherein at least the closing body on the closing member facing side preferably, however, a
  • the stopper body may also have a similar recess, without thereby being impaired in terms of functionality. In this case, the
  • Closing body and the stopper body so be executed completely identical.
  • the closing element cooperates with a valve seat, which is formed on a valve body which is frictionally held in the housing. This is preferably done by pressing. This allows an assembly of the
  • the closing element is designed as a "free-flying" valve ball. That said
  • Injection also has the advantage that a bias of the valve spring with a known spring constant easily, accurately and permanently by means of
  • the invention comprises a pressure limiting valve with a housing, wherein the pressure limiting valve can be embodied by means of one or more of the embodiments described above.
  • Figure 1 is a schematic representation of a fuel system for a
  • FIG. 2 shows a longitudinal section through a pressure relief valve of a high pressure fuel pump of the fuel system of Figure 1.
  • FIG. 1 shows a fuel system 10 for a further not shown
  • Fuel is supplied from a fuel tank 12 via a suction line 14, by means of a prefeed pump 16, via a low-pressure line 18, via an inlet 20 of 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 forcedly-openable 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 outlet valve 40 and also drawn as a spring-loaded check valve
  • Pressure relief valve 42 is arranged.
  • the outlet 36 is at a
  • High-pressure line 44 and connected 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 to the pumping chamber 26 out.
  • Actuator 22 is driven by a control and / or regulating device 48. Deviating from the illustration of Figure 1, a left in Figure 1 connection of the pressure relief valve 42 instead of the
  • Outlet (no reference numeral) of the high-pressure fuel pump 28 may also be connected to the delivery chamber 26 or any other element upstream of the high-pressure fuel pump 28.
  • the prefeed pump 16 delivers fuel from
  • the quantity control valve 24 may be closed and opened depending on a respective need 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
  • FIG. 2 shows a longitudinal section through the pressure-limiting valve 42 of the high-pressure fuel pump 28 of FIG. 1.
  • the pressure relief valve 42 is hydraulically between the outlet 36 and one of the outlet 36th
  • the pressure relief valve may open to the upstream region.
  • the pressure limiting valve 42 comprises a housing 50 designed essentially as a cylindrical sleeve.
  • the housing 50 has an axial first opening 52 on an end face on the left in FIG. 1, wherein a radius of the opening 52 corresponds to an inner radius of the cylindrical sleeve.
  • the first opening 52 is hydraulically the outlet 36 and, respectively, to the downstream
  • the housing 50 is executed closed. In a right lower portion, the housing 50 has a radial second opening 56.
  • the second opening 56 is hydraulically associated with said upstream region of the high-pressure fuel pump 28 and, for example, connected to the delivery chamber 26.
  • the housing 50 is made in one piece.
  • a closing element 58 which is acted upon by a valve spring designed as a helical spring 60 by means of a closing body 62 in the closing direction, ie in the figure 2 to the left.
  • the closing element 58 is a "free-flying" valve ball.
  • a stopper body 64 of the pressure limiting valve 42 is arranged, which cooperates with the closing body 62.
  • the stopper 64 is axially supported on the end wall 54 of the housing 50 and is acted upon by the valve spring 60 against the end wall 54 of the housing 50, that is to the right.
  • the closing body 62 and the stopper body 64 are made substantially identical.
  • an end portion 62 a of the closing body 62 and an end portion 64a of the stopper body 64 is plate-shaped, wherein an outer diameter of the respective end portion 62a and 64a is greater than an inner diameter of the valve spring 60.
  • the closing body 62 comprise a peg-shaped
  • Guide portion 62 b and the stopper body 64 has a pin-shaped guide portion 64 b, which are both disposed radially adjacent to each other within the valve spring 60. Accordingly, a respective outer diameter of the guide portions 62b and 64b is smaller than one
  • Inner diameter of the valve spring 60 This allows, inter alia, an improved guidance of the valve spring 60.
  • the closing body 62 on the plate-shaped end portion 62a has a centering recess 66 for the radial retention of the closing element 58 and is otherwise identical to the stop body 64.
  • the closing body 62 or the centering recess 66 can optimally generate a pressure force generated by the valve spring 60 on the closing element 58
  • valve body 68 In a left in the Figure 2 portion of the housing 50, a valve body 68 is arranged, which is frictionally held on a radially outer surface in the housing 50 and preferably pressed therein.
  • the valve body 68 has a continuous axial central longitudinal channel 70 which has a constant inner diameter in sections.
  • the longitudinal channel 70 is hydraulically connected through the first opening 52 to the outlet 36.
  • a radially encircling valve seat 72 is formed on the valve body 68, which cooperates with the closing element 58.
  • the closing body 62 and the stopper body 64 are solid and, for example, made of a plastic material.
  • the closing body 62 and / or the stopper body 64 at least partially on one or more cavities, whereby weight can be saved.
  • the closing body 62 and the closing element 58 are made together in one piece. This is the dish-shaped end portion 62 a of the closing body 62 is made partially conical or peg-shaped, so that it can seal to the valve seat 72.
  • the housing 50 of the pressure limiting valve 42 is an integral part of the high pressure fuel pump 28 and thus not a separate element.
  • the high-pressure fuel pump 28 for example, a cylindrical bore, in which the functional elements of the pressure relief valve 42nd
  • Geometries of the closing body 62 and the stopper body 64 dimensioned such that a maximum opening travel of the closing body 62 and thus of the closing element 58 is limited.
  • the guide portions 62b and 64b of the closing body 62 and the stopper body 64 can abut flat against one another at respective end portions. In this way, a compressive stress of the valve spring 60 can be reduced.
  • a hydraulic dead volume of the high-pressure fuel pump 28 can be reduced and a so-called "delivery rate" can be improved.
  • the maximum opening travel of the closing element 58 and the geometries of the valve body 68 and the closing body 62 are dimensioned such that the closing element 58 (valve ball) can be kept and / or defined defined ("flight path").

Landscapes

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

Abstract

L'invention concerne une pompe à carburant à haute pression (28) destinée à un système de carburant (10) d'un moteur à combustion interne, comprenant une soupape de limitation de pression (42) qui est disposée dans un boîtier (50) hydrauliquement entre une sortie (36) et une zone en amont de la sortie (36), qui s'ouvre en direction de la zone en amont et qui comporte un élément de fermeture (58) qui est contraint dans le sens de fermeture par un ressort de soupape (60) et comporte un élément de butée (64) qui limite la course d'ouverture maximale de l'élément de fermeture (58). Selon l'invention, l'élément de butée (64) s'appuie axialement sur le boîtier (50) et est contraint contre le boîtier (50) par le ressort de soupape (60).
EP15720091.6A 2014-06-17 2015-05-05 Pompe à carburant à haute pression pour système de carburant d'un moteur à combustion interne Active EP3158185B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014211622.8A DE102014211622A1 (de) 2014-06-17 2014-06-17 Kraftstoff-Hochdruckpumpe für ein Kraftstoffsystem für eine Brennkraftmaschine
PCT/EP2015/059840 WO2015193024A1 (fr) 2014-06-17 2015-05-05 Pompe à carburant à haute pression pour système de carburant d'un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP3158185A1 true EP3158185A1 (fr) 2017-04-26
EP3158185B1 EP3158185B1 (fr) 2019-01-30

Family

ID=53039917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15720091.6A Active EP3158185B1 (fr) 2014-06-17 2015-05-05 Pompe à carburant à haute pression pour système de carburant d'un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP3158185B1 (fr)
DE (1) DE102014211622A1 (fr)
WO (1) WO2015193024A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017217315A1 (de) * 2017-04-13 2018-10-18 Robert Bosch Gmbh Ventil für eine Kraftstoff-Hochdruckpumpe und Verfahren zur Herstellung des Ventils

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202853A1 (de) * 1992-02-01 1993-08-05 Bosch Gmbh Robert Druckventil
DE19710891A1 (de) * 1997-03-15 1998-09-17 Bosch Gmbh Robert Druckventil

Also Published As

Publication number Publication date
WO2015193024A1 (fr) 2015-12-23
EP3158185B1 (fr) 2019-01-30
DE102014211622A1 (de) 2015-12-17

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