EP0877162A2 - Dispositif d'injection de carburant à haute pression - Google Patents

Dispositif d'injection de carburant à haute pression Download PDF

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Publication number
EP0877162A2
EP0877162A2 EP98107614A EP98107614A EP0877162A2 EP 0877162 A2 EP0877162 A2 EP 0877162A2 EP 98107614 A EP98107614 A EP 98107614A EP 98107614 A EP98107614 A EP 98107614A EP 0877162 A2 EP0877162 A2 EP 0877162A2
Authority
EP
European Patent Office
Prior art keywords
flow
return
fuel
wall
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.)
Granted
Application number
EP98107614A
Other languages
German (de)
English (en)
Other versions
EP0877162B1 (fr
EP0877162A3 (fr
Inventor
Hartmut Dipl.-Ing. Stehr
Guido Lautrich
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP0877162A2 publication Critical patent/EP0877162A2/fr
Publication of EP0877162A3 publication Critical patent/EP0877162A3/fr
Application granted granted Critical
Publication of EP0877162B1 publication Critical patent/EP0877162B1/fr
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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00

Definitions

  • the invention relates to a device for high-pressure fuel injection according to the Preamble of claim 1.
  • a high-pressure injection device is known from the generic DE 196 00 256 A1 known with a flow and a return for fuel, being between forward and Return provided a flow connection controlled by a check valve is. If pressure peaks occur in the fuel of the flow, the spring-loaded opens Check valve and relaxes this in the fuel return.
  • column 1 of this document are detailed for the generation of noise in a high-pressure fuel injection essential reasons are given, in this respect is completely on this document Referred.
  • a constant pressure valve for installation in a delivery line is between a pump work space of a fuel injection pump and an injection point an internal combustion engine to be supplied of the shape known that in the constant pressure valve body an inclined inflow line and also an inclined to this extending and intersecting this return flow line are provided for fuel.
  • From A delivery line goes to the injection point from the common intersection.
  • a pressure valve is arranged in the inflow line, which is at the end of a high-pressure delivery abruptly closes the inflow line.
  • the valve closing element is one of this pressure valve arranged on the return side Throttling point downstream, for the training of which various suggestions are made.
  • the invention has for its object a generic device for high pressure injection to improve fuel so that in a structurally simple manner and Way avoiding additional lines in the flow pressure peaks occurring can be relaxed by avoiding cavitation via the return.
  • flow and return are each designed as a substantially parallel flow line or return line and that the valve means transversely to the flow direction of the fuel passes through the return and is arranged in this return laterally delimiting walls.
  • the valve means is inserted directly into the walls concerned, with the installation space required for the valve means being obtained in the return in a relatively close arrangement from the flow to the return.
  • the valve means used in this way acts as a pressure vibration damper and additionally offers the considerable advantage that comparatively cool fuel is fed from the flow into the return while the valve is being opened.
  • the fuel flowing through the supply line is supplied with high-pressure fuel injection devices which, together with an input of heat from the fuel-carrying component, heat the excess fuel to a considerable extent. This is then fed back to the flow at the comparatively high temperature level via the return line and usually significantly worsens the injection behavior of the high-pressure injection devices.
  • the invention thus offers the advantage, on the one hand, that the pressure fluctuations caused by the fuel injection devices are reduced by the pressure vibration damper so as to reduce noise via the return line, and on the other hand a reduction in the overall fuel temperature level is achieved.
  • one of the side walls of the return, which the Lead is spaced, forms an outer wall of the fuel-carrying component.
  • introducing a through opening in this outer wall as well as in a partition between return and flow insert or screw in a valve housing receiving the valve means is possible.
  • valve housing on a stepped Through opening of the partition comes to rest.
  • valve housing is preferably rotationally symmetrical formed and provided with an interior receiving the check valve.
  • An inflow opening for this faces the flow in the installed state.
  • a throttle point between in parallel or in series with the mode of operation of the valve means Forward and reverse is provided. This means that when connected in parallel a certain amount of cool fuel to lower the temperature level in the Rewind. Furthermore, the flow behavior of the fuel in the Preliminary run improved.
  • a fuel-carrying designed as a cylinder head 1 of a reciprocating piston internal combustion engine Component is with a flow line 3 designed as a flow line 2 and a return line 4 trained return 5 provided for fuel. Both lines 2, 4 run parallel to each other and spaced apart by a partition 6. Opposite an outer wall 7 of the cylinder head 1 is shown for this partition 6.
  • valve housing 9 Transverse to the flow direction of the fuel represented by arrows is in the return line 4 a valve housing 9 receiving a valve means 8 is used. To this Purposes are coaxial to each other in the outer wall 7 and the partition 6 Through openings 10 and 11 are provided.
  • the valve housing 9 is rotationally symmetrical and has an interior 12 an inflow opening 30.
  • the valve means designed as a check valve 13 8 arranged in such a way that a valve seat 14 assigned to the flow 3 a by a spring 15 loaded and acting as a closure member 16 is present.
  • a valve seat 14 assigned to the flow 3 a by a spring 15 loaded and acting as a closure member 16 is present.
  • One of these Ball 16 lying away from bearing 25 for the spring 15 is replaced by one of a Outside 17 of the valve housing 9 inserted inner screw 18 formed.
  • the opening pressure of the check valve 13 is thus over the screw depth of the inner screw 18 adjustable in the through opening 12.
  • the valve housing 9 has a thread screwed into the outer wall 7 in the area thereof 19 and has a collar 20 in the region of the partition 6 for abutment on a step 21 the through opening 11.
  • valve housing 9 In the area of the fuel flow through the return 5, the valve housing 9 has a cross-section-reducing groove 22 and a throttle extending transversely in this groove 22 23 in the form of a throttle bore 24.
  • a further throttle 26 in the form of a throttle line 27 in Valve housing 9 can be provided as a bypass such that an inlet is connected to the flow 3 is and the outlet flows into the return 5.
  • the throttle line 27 thus ensures regardless of the position of the ball 16 for a constant partial flow of relatively cool Flow fuel into the already heated return fuel and thus lower the return temperature. Furthermore, this throttle line 27 already dampens the im Flow 3 pulsating fuel column.
  • the installation location of the valve housing 9 in the cylinder head 1 is preferably at one end of the Cylinder head 1 is provided, in particular between an end-side cylinder head wall and their adjacent cylinder number 1.
  • an arrangement between the first and second cylinder of a multi-cylinder internal combustion engine be provided.
  • the fuel is fed into the flow line 3 from the opposite cylinder head wall.
  • Based on this feed point for the Fuel is the fuel column in the supply 3 with respect to cylinder 1 or cylinder 2 longest, i.e. it has a comparatively large one Volume on.
  • This fuel column located in the lead 3 is by the control of the For example, fuel injection devices in the form of pump nozzle elements in Movement, what without the device according to the invention to the known Cavitation formation and the associated filling and noise problems.
  • the Installation location of the valve housing 9 in the area of the maximum length of this fuel column the is called adjacent to cylinder 1 or 2, is therefore particularly effective.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP98107614A 1997-05-10 1998-04-27 Dispositif d'injection de carburant à haute pression Expired - Lifetime EP0877162B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19719801 1997-05-10
DE19719801 1997-05-10

Publications (3)

Publication Number Publication Date
EP0877162A2 true EP0877162A2 (fr) 1998-11-11
EP0877162A3 EP0877162A3 (fr) 2001-08-08
EP0877162B1 EP0877162B1 (fr) 2003-07-09

Family

ID=7829205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98107614A Expired - Lifetime EP0877162B1 (fr) 1997-05-10 1998-04-27 Dispositif d'injection de carburant à haute pression

Country Status (2)

Country Link
EP (1) EP0877162B1 (fr)
DE (1) DE59808947D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10105031A1 (de) * 2001-02-05 2002-08-14 Bosch Gmbh Robert Vorrichtung zur Dämpfung von Druckpulsationen in Hochdruckeinspritzsystemen
EP1589218A1 (fr) * 2004-04-20 2005-10-26 Robert Bosch Gmbh Amortisseur des fluctuations pour un système hydraulique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4216068A1 (de) 1992-05-15 1993-11-18 Bosch Gmbh Robert Gleichdruckventil
DE19600256A1 (de) 1995-01-14 1996-07-18 Volkswagen Ag Einrichtung zur geräuscharmen Hochdruckeinspritzung von Kraftstoff

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231342A (en) * 1979-01-29 1980-11-04 General Motors Corporation Diesel fuel heat recovery system and control valve therefor
US4485790A (en) * 1982-04-19 1984-12-04 Yanmar Diesel Engine Company Limited Holding construction of a fuel injection valve in an internal combustion engine
US5572974A (en) * 1995-02-21 1996-11-12 Siemens Automotive Corporation Combined start bypass and safety pressure relief valve for a fuel system
SE510090C2 (sv) * 1996-10-11 1999-04-19 Volvo Lastvagnar Ab Långsträckt cylinderhuvud med kaviteter för insprutningsenheter och bränsletillförselanordningar

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4216068A1 (de) 1992-05-15 1993-11-18 Bosch Gmbh Robert Gleichdruckventil
DE19600256A1 (de) 1995-01-14 1996-07-18 Volkswagen Ag Einrichtung zur geräuscharmen Hochdruckeinspritzung von Kraftstoff

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10105031A1 (de) * 2001-02-05 2002-08-14 Bosch Gmbh Robert Vorrichtung zur Dämpfung von Druckpulsationen in Hochdruckeinspritzsystemen
EP1589218A1 (fr) * 2004-04-20 2005-10-26 Robert Bosch Gmbh Amortisseur des fluctuations pour un système hydraulique

Also Published As

Publication number Publication date
EP0877162B1 (fr) 2003-07-09
EP0877162A3 (fr) 2001-08-08
DE59808947D1 (de) 2003-08-14

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