EP0372211A1 - Pompe à injection de combustible pour moteur à combustion interne à injection - Google Patents

Pompe à injection de combustible pour moteur à combustion interne à injection Download PDF

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Publication number
EP0372211A1
EP0372211A1 EP19890119889 EP89119889A EP0372211A1 EP 0372211 A1 EP0372211 A1 EP 0372211A1 EP 19890119889 EP19890119889 EP 19890119889 EP 89119889 A EP89119889 A EP 89119889A EP 0372211 A1 EP0372211 A1 EP 0372211A1
Authority
EP
European Patent Office
Prior art keywords
suction
groove
overflow
pump
overflow bore
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
EP19890119889
Other languages
German (de)
English (en)
Other versions
EP0372211B1 (fr
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/fr
Application granted granted Critical
Publication of EP0372211B1 publication Critical patent/EP0372211B1/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
    • 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 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.
  • cavitation occurs (cavity cavitation or beam cavitation). This causes material to be removed and, if this effect lasts for a sufficiently long time, the pumps malfunction.
  • a so-called pre-control already controls a small amount of fuel from the working area of the pump piston into the suction area before the geometric delivery end, which is determined by smoothing the lower control edge over the suction and overflow bore.
  • This amount of fuel changes the flow rate 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 area and thereby a "softer” imploding of the cavities already present and a substantial reduction in the fuel volume with higher pressure Cavities.
  • the pump piston liner which is exposed to a very high internal pressure, is weakened on the one hand and a "predetermined breaking cross section" is created, so to speak, which is dangerous.
  • the fuel jet entering the suction and overflow chamber is directed axially parallel and does not cover the entire cross section of the suction and overflow bore, so that cavities can remain in the fuel volume in the suction and overflow bore, which then cause cavitation when implosion.
  • 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 bores tion.
  • 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 a 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 pre-entering jet according to arrow 16, on the one hand, the fuel volume located in the suction and overflow bore 9 is better detected and the pre-entering fuel jet exerts 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 show the pressure curve in one embodiment without a pilot control groove 11.
  • the pressure values are plotted on the ordinate and the piston paths or the rotation angles of the cam are plotted on 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 when a pre-control groove is arranged
  • 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.
  • At. 6 represents the entire pump element, 18 the pump housing, 10 the pump piston sleeve inserted into this, 19 the pump piston and 20 the working chamber of the pump piston 19.
  • 21 is the pressure valve and 22 is the delivery channel for the fuel pressurized in the working chamber 20 .
  • 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.
  • the lower control edge 27 which determines the delivery end first overruns the inclined pilot control groove 11 at the end of the delivery before the full cross section of the suction and overflow bore 9 is released, so that the first inclined fuel jet gives a flatter pressure increase in the suction and overflow chamber 17.

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 Pompe à injection de combustible pour moteur à combustion interne à injection Expired - Lifetime EP0372211B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=6367986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890119889 Expired - Lifetime EP0372211B1 (fr) 1988-11-26 1989-10-26 Pompe à injection de combustible pour moteur à combustion interne à injection

Country Status (3)

Country Link
EP (1) EP0372211B1 (fr)
JP (1) JPH0754618Y2 (fr)
DE (2) DE3840022A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005085626A1 (fr) 2004-03-05 2005-09-15 Bosch Corporation Pompe à injection de carburant pour moteur à combustion interne
CN101603484B (zh) * 2008-06-10 2014-07-30 曼柴油机欧洲股份公司 用于内燃机的喷射泵和带有喷射泵的内燃机

Families Citing this family (1)

* 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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB930076A (en) * 1958-10-21 1963-07-03 Burmeister & Wains Mot Mask Improvements in and relating to a fuel injection system for internal combustion engines
GB1110223A (en) * 1964-04-21 1968-04-18 Sulzer Ag Fuel injection pumps for internal combustion piston engines
DE2130937A1 (de) * 1970-06-22 1971-12-30 Nippon Denso Co Einspritzpumpe fuer Verbrennungsmotoren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB930076A (en) * 1958-10-21 1963-07-03 Burmeister & Wains Mot Mask Improvements in and relating to a fuel injection system for internal combustion engines
GB1110223A (en) * 1964-04-21 1968-04-18 Sulzer Ag Fuel injection pumps for internal combustion piston engines
DE2130937A1 (de) * 1970-06-22 1971-12-30 Nippon Denso Co Einspritzpumpe fuer Verbrennungsmotoren

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005085626A1 (fr) 2004-03-05 2005-09-15 Bosch Corporation Pompe à injection de carburant pour moteur à combustion interne
EP1722098A1 (fr) * 2004-03-05 2006-11-15 Bosch Corporation Pompe injection de carburant pour moteur combustion interne
KR100781915B1 (ko) * 2004-03-05 2007-12-04 봇슈 가부시키가이샤 내연기관의 연료분사펌프
EP1722098A4 (fr) * 2004-03-05 2010-01-20 Bosch Corp Pompe injection de carburant pour moteur combustion interne
CN101603484B (zh) * 2008-06-10 2014-07-30 曼柴油机欧洲股份公司 用于内燃机的喷射泵和带有喷射泵的内燃机

Also Published As

Publication number Publication date
DE58901695D1 (de) 1992-07-23
JPH0278764U (fr) 1990-06-18
JPH0754618Y2 (ja) 1995-12-18
DE3840022A1 (de) 1990-05-31
EP0372211B1 (fr) 1992-06-17

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