EP1073840B1 - Zuschaltventil in einem kraftstoffeinspritzsystem für brennkraftmaschinen - Google Patents

Zuschaltventil in einem kraftstoffeinspritzsystem für brennkraftmaschinen Download PDF

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Publication number
EP1073840B1
EP1073840B1 EP98966770A EP98966770A EP1073840B1 EP 1073840 B1 EP1073840 B1 EP 1073840B1 EP 98966770 A EP98966770 A EP 98966770A EP 98966770 A EP98966770 A EP 98966770A EP 1073840 B1 EP1073840 B1 EP 1073840B1
Authority
EP
European Patent Office
Prior art keywords
bore
valve
pressure pump
housing
pump
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.)
Expired - Lifetime
Application number
EP98966770A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1073840A1 (de
Inventor
Erhard Faix
Helmut Clauss
Rainer Lorenz
Gerd Loesch
Markus Rueckle
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 EP1073840A1 publication Critical patent/EP1073840A1/de
Application granted granted Critical
Publication of EP1073840B1 publication Critical patent/EP1073840B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M63/02—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
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7908—Weight biased
    • Y10T137/7909—Valve body is the weight
    • Y10T137/791—Ball valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7922—Spring biased
    • Y10T137/7927—Ball valves

Definitions

  • the invention relates to a connecting valve according to the Genus of claim 1.
  • valve piston is driven by the pressure of the Low pressure pump fuel delivered against the force the compression spring can be moved. If one is exceeded Pressure threshold gives the valve piston a line connection to pump elements of the high pressure pump free.
  • connection valve has several functions: on the one hand it can the low-pressure part of the fuel injection system on the way through the throttle bore and the camshaft space be vented. The other is through the throttle bore the camshaft chamber with lubricant Fuel supplied.
  • connection valve should in the event of a defect in the high-pressure system part as Shut-off valve serve to protect the internal combustion engine.
  • a disadvantage of this known embodiment is that the one not removed from the high pressure pump Fuel flow an uneconomical mode of operation Low pressure pump.
  • connection valve according to the invention with the features of Compared to claim 1 has the advantage that outside the direct line connection between the Low pressure pump and the high pressure pump lying next to the Venting the low pressure side Fuel injection system part and the dimensioning of the Lubricant flow to the camshaft of the high pressure pump also the shutdown of the not by the high pressure pump decreased fuel volume flow immediately to Ensures the suction side of the low pressure pump. It controls the connection valve two fuel circuits, namely the the lubrication and cooling of the high pressure pump and the Serve the return of the de-fueled fuel, whereby the first-mentioned circuit when switching on the second Circulation remains largely unaffected. Furthermore is by returning the de-fueled fuel directly to the suction side of the low pressure pump Conveying capacity increased, because a for filtering the Bypassed the system's fuel pre-filter can be.
  • valve is advantageous because with a single movable valve member several Valve functions are exercised.
  • the valve is also completely pre-assembled and testable. by virtue of its arrangement in the housing of the high pressure pump is the Installation of the valve in the system with little effort connected, in particular only a seal after required on the outside because the screw thread Connections of the pump housing to the camshaft space and Adequate suction side of the low pressure pump hydraulically separated. This is the connection valve can be manufactured with a relatively short valve housing.
  • FIG. 1 shows a Hydraulic circuit diagram of a schematically reproduced Fuel injection system with a high pressure pump assigned connection valve and Figure 2, the connection valve in longitudinal section.
  • Fuel storage injection system 10 for Internal combustion engines that is direct injection Diesel engines, has as essential elements Low pressure pump 11, a high pressure pump 12, a High-pressure fuel accumulator (common rail) 13, injection solenoid valves (Injectors) 14, a flow control valve 15 as well as a connecting valve 16.
  • the low pressure pump 11 is with a suction line 17 to a fuel tank 18 and with a low pressure line 19 to the high pressure pump 12 connected.
  • In the low pressure line 19 is the flow control valve 15.
  • the low pressure pump 11 fed high pressure pump 12 is in turn on the outlet side through a high pressure line 20 to the high pressure fuel accumulator 13 in connection to which the injection solenoid valves 14 are connected.
  • the high-pressure pump 12 is a radial piston pump by design with several pump elements 23, of which in FIG. 1 only one element is shown.
  • To drive the Pump elements 23 serve a camshaft 24 (or a Eccentric shaft or crankshaft).
  • the camshaft 24 is located itself in a camshaft space 25 of a pump housing 26. From the cut-in valve 16, which on the inflow side to the Low pressure line 19 is connected, leads Supply line 27 in the camshaft space 25 and one Return line 28 to suction line 17 of the low pressure pump 11.
  • the camshaft chamber 25 is in turn on the exhaust side Tank drain line 21 connected.
  • Connection valve 16 shows a hollow cylindrical one Screw-in part designed, mainly in one Blind hole 31 of the pump housing 26 of the high pressure pump 25 received valve housing 32, in its stepped Through bore 33 a longitudinally movable valve piston 34, an axially arranged one behind the other Helical compression spring 35 and a through hole 33 outwardly sealed ball 36 are.
  • the valve housing 32 has an externally threaded section 37 on which it is under attack on one hexagon 38 on the valve housing into the blind hole 31 is screwed in. In the drawn position of the Valve housing 32 engages in the drawing below located end face 39 at the bottom 40 of the hole Blind hole 31 on. On the part of the mouth 41 of the Blind hole 31 is the valve housing 32 with a Sealing ring 42 sealed.
  • the valve housing 32 is between the sealing ring 42 and the Bore bottom 40 with two through holes 33 crossing cross holes 45 and 46 provided.
  • the Sealing ring-side cross bore 45 is with a first Outflow bore 47 of the pump housing 26 in connection.
  • the first outflow bore 47 is part of the feed line 27 to Camshaft chamber 25 of the high pressure pump 12 (see Figure 1).
  • the second transverse bore 46 of the valve housing remote from the sealing ring 32 stands with a second outflow bore 48 Pump housing 26 in connection.
  • the second drain hole 48 is part of the suction side of the low pressure pump 11 leading return line 28.
  • Face of the valve housing 32 there is an inflow bore 49 with the through bore 33 in connection.
  • the inflow bore 49 is to that of the Low pressure pump 11 leading to high pressure pump 12 Low pressure line 19 connected.
  • the second Outflow bore 48 is due to the dense attack of the Valve housing 32 on the bottom 40 of the hole completely Inflow bore 49 separated. Adequate hydraulic Sealing is between the first outflow bore 47 and the second outflow bore 48 through the screw connection (Male thread section 37) between the valve housing 32 and achieved the pump housing 26.
  • the sleeve-shaped valve piston 34 is suitable in the through hole 33 of the valve housing 32 is added.
  • the Valve piston 34 In the rest position of the connecting valve 16 is the Valve piston 34 with a circumferentially arranged Snap ring 51 on a step 52 of the through hole 33 due to the spring force of those acting on the valve piston Helical compression spring 35 supported. Their bias is by correspondingly deeply pressing the ball 36 into the Through hole 33 set.
  • the valve piston 34 has in its spring-side piston head 53 has a throttle bore 54, through which the spring section of the Through hole 33 with the interior 55 of the valve piston 34 communicates.
  • the valve piston has a circumference 34 an annular groove 56, which by one or more Throttle bores 57 is connected to the interior 55.
  • the Annular groove 56 of the valve piston 34 forms a first Control edge 58, the level 52 of the Through hole 33 is a hollow cone-shaped first Control contour 59 of the valve housing 32 is assigned.
  • the Valve piston 34 has on its end facing away from the spring a second control edge 60, which with the second Control contour 61 forming transverse bore 46 of the valve housing 32 cooperates.
  • valve piston 34 blocks the connection between the Inflow bore 49 through the throttle bore 57 to the first Outflow bore 47 and from the inflow bore 49 to second outflow bore 48.
  • the inflow hole 49 is however, constantly through the throttle bore 54 in the piston crown 53 connected to the camshaft chamber 25 of the high pressure pump 12.
  • the low pressure system Air located through the throttle bore 54 in the piston crown 56 of the valve piston 34 through the first outflow bore 47 in the camshaft space 25 and from this through the Drain the tank drain line 21. This is a vent of the low pressure system effectively achieved.
  • the fuel supplied to the switching valve 16 becomes the Valve piston 34 from its rest position against the Spring force of the compression spring 35 shifted. If exceeded the first control edge 58 reaches a first pressure threshold of the valve piston 34 in the area of the control contour 59, so that a fuel flow from the inflow bore 49 through the Throttle bore 57 of the valve piston 34 to the first Outflow bore 47 and further into the camshaft space 25 of the High pressure pump 12 can flow.
  • the connecting valve 16 acts with a small stroke of the valve piston 34 as a flow control valve, with the one for lubricating and cooling the high pressure pump 12 sufficient fuel volume flow is set. To this is due to the parallel to the throttle bore 57 throttle bore 54 extending in the piston crown 53 Add partial fuel quantity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP98966770A 1998-04-24 1998-12-10 Zuschaltventil in einem kraftstoffeinspritzsystem für brennkraftmaschinen Expired - Lifetime EP1073840B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19818385A DE19818385A1 (de) 1998-04-24 1998-04-24 Zuschaltventil in einem Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE19818385 1998-04-24
PCT/DE1998/003628 WO1999056016A1 (de) 1998-04-24 1998-12-10 Zuschaltventil in einem kraftstoffeinspritzsystem für brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP1073840A1 EP1073840A1 (de) 2001-02-07
EP1073840B1 true EP1073840B1 (de) 2002-06-12

Family

ID=7865693

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98966770A Expired - Lifetime EP1073840B1 (de) 1998-04-24 1998-12-10 Zuschaltventil in einem kraftstoffeinspritzsystem für brennkraftmaschinen

Country Status (5)

Country Link
US (1) US6422212B1 (ja)
EP (1) EP1073840B1 (ja)
JP (1) JP4280419B2 (ja)
DE (2) DE19818385A1 (ja)
WO (1) WO1999056016A1 (ja)

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DE19954695A1 (de) * 1999-11-13 2001-05-23 Bosch Gmbh Robert Kraftstoffeinspritzsystem
IT1310755B1 (it) * 1999-11-30 2002-02-22 Elasis Sistema Ricerca Fiat Pompa idraulica ad alta pressione, in particolare pompa a pistoniradiali per il carburante di un motore a combustione interna.
IT1310754B1 (it) * 1999-11-30 2002-02-22 Elasis Sistema Ricerca Fiat Sistema di valvole per il controllo della pressione di ingresso di unliquido in una pompa ad alta pressione, e relativa valvola di
DE10009182C2 (de) * 2000-02-26 2003-12-18 Daimler Chrysler Ag Verfahren zum Steuern oder Regeln der Leistung einer Brennkraftmaschine
DE10057786A1 (de) * 2000-11-22 2002-06-06 Siemens Ag Einspritzsystem für eine Brennkraftmaschine und Verfahren zum Regeln und/oder Entlüften eines solchen Einspritzsystems
DE10061296A1 (de) * 2000-12-08 2002-06-27 Siemens Ag Einspritzsystem für eine Brennkraftmaschine
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DE102010001834A1 (de) * 2010-02-11 2011-08-11 Robert Bosch GmbH, 70469 Verfahren zur Versorgung einer Hochdruckpumpe in einem Kraftstoffeinspritzsystem einer Brennkraftmaschine mit Kraftstoff sowie Kraftstoffeinspritzsystem
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DE102011003362A1 (de) * 2011-01-31 2012-08-02 Robert Bosch Gmbh Überströmventil für ein Kraftstoffeinspritzsystem und Krafststoffeinspritzsystem mit Überströmventil
ITMI20110966A1 (it) * 2011-05-27 2012-11-28 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, da un serbatoio di contenimento ad un motore a combustione interna
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Also Published As

Publication number Publication date
JP4280419B2 (ja) 2009-06-17
US6422212B1 (en) 2002-07-23
EP1073840A1 (de) 2001-02-07
WO1999056016A1 (de) 1999-11-04
DE59804470D1 (de) 2002-07-18
DE19818385A1 (de) 1999-10-28
JP2002513115A (ja) 2002-05-08

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