EP0372211B1 - Kraftstoffeinspritzpumpe für Einspritzbrennkraftmaschinen - Google Patents

Kraftstoffeinspritzpumpe für Einspritzbrennkraftmaschinen Download PDF

Info

Publication number
EP0372211B1
EP0372211B1 EP19890119889 EP89119889A EP0372211B1 EP 0372211 B1 EP0372211 B1 EP 0372211B1 EP 19890119889 EP19890119889 EP 19890119889 EP 89119889 A EP89119889 A EP 89119889A EP 0372211 B1 EP0372211 B1 EP 0372211B1
Authority
EP
European Patent Office
Prior art keywords
suction
pump piston
fuel injection
pump
overflow
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
EP19890119889
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0372211A1 (de
Inventor
Stanislaw Dr.-Dipl.-Ing. Bodzak
Theodor Dr.-Dipl.-Ing. Stipek
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 EP0372211A1 publication Critical patent/EP0372211A1/de
Application granted granted Critical
Publication of EP0372211B1 publication Critical patent/EP0372211B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
    • 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
    • F02M55/001—Pumps with means for preventing erosion on fuel discharge

Definitions

  • the invention relates to a fuel injection pump for injection internal combustion engines, in which the pump piston liner has at least one suction and overflow bore, which is closed at the start of delivery by an upper control edge of the pump piston and is released at the end of delivery by a lower control edge of the pump piston.
  • the terms “above” and “below” refer to a position in which the working space of the pump piston is arranged at the top and the drive element or the drive cam is arranged at the bottom.
  • Very high pressures for example of 1500 bar or more, occur in the working area of the pump piston.
  • pressure fluctuations with high pressure peaks occur in the suction and overflow bores and in the suction chamber.
  • There are air bubbles or voids in the fuel and these high pressure peaks lead on the one hand to the implosion of the voids that already existed from the previous control process at the start of delivery, and on the other hand to the formation and subsequent implosion of new voids in the area of the liquid jet flowing in at high speed. If the cavities implode near the wall, cavitation occurs (cavity cavitation or jet cavitation). This causes material to be removed and, if this effect lasts for a sufficiently long time, the pumps will malfunction.
  • a so-called pilot control already controls a small amount of fuel from the working area of the pump piston into the suction area before the geometric end of the delivery, which is determined by smoothing the lower control edge over the suction and overflow bore.
  • This quantity of fuel changes the flow of the delivery tube from the working area of the pump piston to the nozzle only insignificantly, but causes an initially "soft", that is, a flatter rise in pressure in the suction space and thereby a "softer” imploding of the already existing cavities and a substantial reduction in the fuel volume which arises with higher pressure Cavities.
  • control groove consists of a longitudinal groove, which is located upstream of the suction and overflow bore to the pump piston drive side and whose lower pump piston drive-side boundary edge runs perpendicular to the cylinder wall.
  • the fuel jet entering the suction and overflow bore is directed axially parallel and then strongly deflected in the bore, so that cavities can still remain in the fuel volume in the suction and overflow bore, which then cause cavitation in their impolation.
  • a fuel injection pump is also known in which the suction and overflow bore is in the form of a Laval nozzle with an approximately funnel-shaped inlet and diffuser-shaped outlet.
  • Such types of holes can hardly be produced for large-scale products with reasonable effort.
  • the invention now aims to improve such a design and consists essentially in the fact that the base of the pilot valve groove runs obliquely upwards in the direction away from the piston running surface. It is thereby achieved that the pilot valve groove does not extend at least in its full depth over the entire length of the suction and overflow bore and therefore the risk of breakage of the pump piston liner is reduced.
  • the inclined position also ensures that the fuel jet flowing into the suction and overflow bore is directed towards the axis of the same and therefore includes the entire fuel volume in the suction and overflow bore and also has a discharge effect on the cavities in the direction of the suction. and overflow space, whereby cavitation in the suction and overflow bore, where these have the worst effect, is avoided or at least reduced.
  • the base of the pilot valve groove is inclined at an angle of 5 ° to 45 °, in particular 15 ° to 45 °, to the axis of the suction and overflow bore. This advantageously results in the shortening of the pre-tax groove and therefore the reduction in the risk of breakage. This angle is also favorable for the removal of the cavities from the suction and overflow bore and for the detection of the entire fuel volume located in the suction and overflow bore.
  • the pilot valve groove expediently extends only over part of the cylindrical region of the suction and overflow bore.
  • FIG. 1 and 2 show a known suction and overflow bore
  • FIG. 1 being an axial partial section through the pump piston liner in the area of the suction and overflow bore
  • FIG. 2 being a view in the direction of arrow II of FIG. 1.
  • 3 and 4 show the invention Formation of the suction and overflow bore
  • FIG. 3 being a partial axial section through the pump piston liner in the area of the suction and overflow bore
  • FIG. 4 being a view in the direction of arrow IV of FIG. 3.
  • FIG. 5 shows a diagram and FIG. 6 shows a partial axial section through a pump element of the fuel injection pump according to the invention.
  • a known suction and overflow bore 1 in the pump piston liner 2 is shown.
  • the pre-control groove 3 runs parallel to the axis 4 over the entire cylindrical area 5 of the suction and overflow bore 1.
  • the suction and overflow bore 1 widens conically and in this area an exemption 7 of the pre-flow groove 3 is also incorporated.
  • the pump piston sleeve Due to the pre-control groove 3 running over the entire cylindrical area and also due to the exemption 7, the pump piston sleeve is weakened and prone to breakage.
  • the fuel jet entering beforehand runs parallel to the axis and does not cover the entire fuel volume located in the suction and overflow bore 1 and, moreover, has an insufficient effect on the cavities in the direction of the suction and overflow chamber 8.
  • pilot valve groove 11 is arranged obliquely so that the base 12 of the pilot valve groove 11 is inclined at an angle ⁇ to the axis 13.
  • the pilot control groove 11 thus extends only over part of the length of the cylindrical region 14 of the suction and overflow bore 9, and this results in a lower risk of breakage for the pump piston bushing 10.
  • the lower control edge of the pump piston which determines the delivery end, overrides the pilot control groove 11 at the delivery end before it begins to expose the full cross section 15 of the suction and overflow bore 9.
  • the direction of the fuel jet entering beforehand is indicated by arrow 16. Due to the oblique course of this in advance entering jet according to arrow 16, therefore, on the one hand, the fuel volume located in the suction and overflow bore 9 is better detected and the fuel jet entering beforehand has a more favorable discharge effect on the cavities in the direction of the suction and overflow chamber 17.
  • Curve a shows the pressure curve in the working chamber of the pump cylinder and curve b shows the pressure curve in the suction and overflow chamber 17 or in the suction and overflow bore 9.
  • the dashed part a 'of curve a and the dashed part b' of curve b shows the pressure curve in an embodiment without a pilot groove 11.
  • the pressure values are plotted in the ordinate and the piston paths or the rotation angles of the cam are plotted in the abscissa.
  • the position c indicates the opening of the pilot control groove 11, d indicates the opening of the suction and overflow bore 9.
  • curve b which shows the pressure curve in the suction and overflow chamber 17 in the arrangement of a pilot valve groove
  • curve b ' which shows the pressure curve in the suction and overflow chamber in an arrangement in which no pre-flow groove 11 is provided.
  • 18 represents the pump housing, 10 the pump piston sleeve inserted into this, 19 the pump piston and 20 the working space of the pump piston 19.
  • 21 is the pressure valve and 22 is the delivery channel for the pressure in the working space 20
  • Fuel. 23 is an intermediate piece, which is pressed against the pump piston liner 10 by means of screws 25 acting on the pump housing 18 by means of the pressure valve housing 24.
  • the suction and overflow bore is again designated 9 and the suction and overflow chamber 17. Furthermore, the oblique pilot control groove 11 can be seen, the control edges of the pump piston interacting with the suction and overflow bore being designated by 26 and 27, respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19890119889 1988-11-26 1989-10-26 Kraftstoffeinspritzpumpe für Einspritzbrennkraftmaschinen Expired - Lifetime EP0372211B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883840022 DE3840022A1 (de) 1988-11-26 1988-11-26 Kraftstoffeinspritzpumpe fuer einspritzbrennkraftmaschinen
DE3840022 1988-11-26

Publications (2)

Publication Number Publication Date
EP0372211A1 EP0372211A1 (de) 1990-06-13
EP0372211B1 true EP0372211B1 (de) 1992-06-17

Family

ID=6367986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890119889 Expired - Lifetime EP0372211B1 (de) 1988-11-26 1989-10-26 Kraftstoffeinspritzpumpe für Einspritzbrennkraftmaschinen

Country Status (3)

Country Link
EP (1) EP0372211B1 (US06168655-20010102-C00055.png)
JP (1) JPH0754618Y2 (US06168655-20010102-C00055.png)
DE (2) DE3840022A1 (US06168655-20010102-C00055.png)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4227854B4 (de) * 1992-08-22 2005-12-15 Robert Bosch Gmbh Kraftstoffeinspritzpumpe für Brennkraftmaschinen
JP4098738B2 (ja) * 2004-03-05 2008-06-11 ボッシュ株式会社 内燃機関のための燃料噴射ポンプ
DE102008027651A1 (de) * 2008-06-10 2009-12-17 Man Diesel Se Einspritzpumpe für eine Brennkraftmaschine und Brennkraftmaschine mit Einspritzpumpe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK94066C (da) * 1958-10-21 1962-08-06 Burmeister & Wains Mot Mask Brændselsindsprøjtningssystem til forbrændingsmotorer.
NL125952C (US06168655-20010102-C00055.png) * 1964-04-21
GB1322694A (en) * 1970-06-22 1973-07-11 Nippon Denso Co Fuel injection pumps for internal combustion engines

Also Published As

Publication number Publication date
JPH0278764U (US06168655-20010102-C00055.png) 1990-06-18
EP0372211A1 (de) 1990-06-13
JPH0754618Y2 (ja) 1995-12-18
DE3840022A1 (de) 1990-05-31
DE58901695D1 (de) 1992-07-23

Similar Documents

Publication Publication Date Title
DE4320620B4 (de) Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
EP0347581B1 (de) Einspritzpumpe für Brennkraftmaschinen
DE3804843A1 (de) Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE3211877A1 (de) Kraftstoffeinspritzpumpe
EP0372211B1 (de) Kraftstoffeinspritzpumpe für Einspritzbrennkraftmaschinen
DE69926450T2 (de) Kraftstoffzufuhreinrichtung
DE4441506A1 (de) Kraftstoffeinspritzpumpe
DE3236828A1 (de) Brennstoffeinspritzvorrichtung
CH680231A5 (US06168655-20010102-C00055.png)
EP0269610A1 (de) Pumpenelement einer Brennstoffeinspritzpumpe für Einspritzbrennkraftmaschinen
DE3424989C2 (de) Kraftstoffeinspritzpumpe für Brennkraftmaschinen
DE1244469B (de) Kraftstoffeinspritzanlage fuer Brennkraftmaschinen, insbesondere Dieselmotoren, mit einer den Foerderbeginn der Einspritzpumpe aendernden Verstelleinrichtung
DE2730091A1 (de) Schraegkantengesteuerte kraftstoffeinspritzpumpe fuer brennkraftmaschinen
EP0263807B1 (de) Pumpenelement einer Brennstoffeinspritzpumpe für Einspritzbrennkraftmaschinen
EP1496243B1 (de) Verbrennungskraftmaschime
DE3509770A1 (de) Kraftstoffeinspritzeinheit
DE2047990C3 (de) Druckventil für Kraftstoffeinspritzpumpen für Brennkraftmaschinen
DE3644150C2 (de) Kraftstoffeinspritzpumpe für Brennkraftmaschinen
AT227480B (de) Mit einer hin- und hergehenden Bewegung arbeitende Pumpe mit Selbstregelung der Förderleistung, insbesondere zur Brennstoffeinspritzung in Motoren
EP0263808B1 (de) Pumpenelement einer Brennstoffeinspritzpumpe für Einspritzbrennkraftmaschinen
DE10046564B4 (de) Einspritzpumpe für Brennkraftmaschinen
DE1244468B (de) Kraftstoffeinspritzanlage fuer Brennkraftmaschinen, insbesondere Dieselmotoren, mit einer den Foerderbeginn der Einspritzpumpe aendernden Verstelleinrichtung
WO1991015675A1 (de) Kraftstoffeinspritzeinrichtung für einspritzbrennkraftmaschinen
DE2003958C3 (de) Kraftstoffeinspritzpumpe für Brennkraftmaschinen
EP0444256B1 (de) Kraftstoffeinspritzeinrichtung für Einspritzbrennkraftmaschinen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

PUAF Information related to the publication of a search report (a3 document) modified or deleted

Free format text: ORIGINAL CODE: 0009199SEPU

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

R17D Deferred search report published (corrected)

Effective date: 19900613

17P Request for examination filed

Effective date: 19901030

17Q First examination report despatched

Effective date: 19910605

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ROBERT BOSCH GMBH

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 58901695

Country of ref document: DE

Date of ref document: 19920723

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20011017

Year of fee payment: 13

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030630

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20041222

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20051011

Year of fee payment: 17

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051026

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060503

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20061026

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061026