EP1069307A1 - Pompe à injection de combustible à injection pilote - Google Patents

Pompe à injection de combustible à injection pilote Download PDF

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Publication number
EP1069307A1
EP1069307A1 EP99113377A EP99113377A EP1069307A1 EP 1069307 A1 EP1069307 A1 EP 1069307A1 EP 99113377 A EP99113377 A EP 99113377A EP 99113377 A EP99113377 A EP 99113377A EP 1069307 A1 EP1069307 A1 EP 1069307A1
Authority
EP
European Patent Office
Prior art keywords
fuel
piston
pilot
pressure chamber
fuel injection
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.)
Withdrawn
Application number
EP99113377A
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German (de)
English (en)
Inventor
Rolf Prillwitz
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.)
LOrange GmbH
Original Assignee
LOrange 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 LOrange GmbH filed Critical LOrange GmbH
Priority to EP99113377A priority Critical patent/EP1069307A1/fr
Publication of EP1069307A1 publication Critical patent/EP1069307A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/06—Pumps peculiar thereto

Definitions

  • the invention relates to a fuel injection pump for an internal combustion engine according to the Preamble of claim 1.
  • a fuel injection pump of this type comprises a one that is guided in a pump cylinder Pump piston and a pressure chamber acted upon by the pump piston which the fuel delivered by the pump piston to a delivery channel Injection is delivered into the combustion chamber of the internal combustion engine.
  • the Pump piston has an upper control edge on the pressure chamber side and at least a lower control edge, these control edges by sweeping at least one in communication with a suction chamber of the fuel injection pump Control bore opening pressure chamber start and end of the fuel delivery of the Determine the pump piston. Furthermore, one is on the front of the one in the Pressurized fuel piston under pressure in the pressure chamber Promote a fuel quantity upstream of the rear of the pilot piston Pilot injection is provided in the combustion chamber of the internal combustion engine.
  • the injection of a relatively small amount of fuel as a so-called pilot amount Start of combustion, that is before the start of injection for the main injection quantity required for combustion is in internal combustion engines, especially diesel engines, a suitable measure to improve the operating behavior of the To significantly improve the internal combustion engine.
  • a disadvantage of the known fuel injection pump is that it has only a limited one Advance of the injection of the pilot quantity over the injection of the Main quantity allows. To further improve the combustion process in the The combustion chamber of the internal combustion engine would, however, be a larger spread over time Pilot quantity injection and main quantity injection desirable.
  • the object of the invention is therefore to provide a fuel injection pumpkind in such a way that they have a greater advance in injection timing Pilot amount allowed against the injection of the main fuel amount.
  • the fuel injection pump comprises one in a pump cylinder guided pump piston and a pressure chamber acted upon by the pump piston, from which the fuel delivered by the pump piston via a delivery channel Injection is delivered into the combustion chamber of the internal combustion engine.
  • the Pump piston has an upper control edge and located on the pressure chamber side at least one lower control edge, which can be achieved by painting over at least one connected with a suction chamber of the fuel injection pump in the Control bore opening pressure chamber start and end of the fuel delivery of the Determine the pump piston.
  • pressurized fuel pressurized pilot piston is for Promotion of an upstream amount of fuel for pilot injection in the combustion chamber of the internal combustion engine is provided.
  • the pilot piston is according to the invention formed as a multi-stage piston, one of which is located in the pressure chamber Fueled first section of the pilot piston a much larger area has as a second section of the pilot piston that delivers the upstream fuel quantity.
  • a particular advantage of the fuel injection pump according to the invention is that the Pilot piston due to the much larger dimension of that in the pressure chamber located fuel applied area as the upstream amount of fuel promoting area acts as a pressure booster piston, so that the already before The control bores close due to the movement of the pump piston building initial pressure is sufficient to promote the movement of the pilot piston Initiate pilot quantity.
  • the surface area is advantageously that of the one located in the pressure chamber Fueled first section of the pilot piston between 3 times up 20 times, preferably between 5 times to 12 times the area of the upstream fuel quantity promoting second section of the pilot piston.
  • the pilot piston at the pressure chamber end of the pump housing Fuel injection pump is arranged, and that of that in the pressure chamber located fuel applied to the front of the pilot piston via a Connection channel is coupled to the pressure chamber. This enables a space-saving Arrangement of the pilot piston on the fuel injection pump.
  • the pilot piston is in a multi-stage Bore slidably mounted, the one on the back of the one in the Fuel chamber located in the pressurized first section of the space multi-stage drilling via a connecting channel with the suction chamber Fuel injection pump is coupled. This advantageously becomes part of the Displacement of the pilot piston required from the pressure chamber of the Fuel injection pump withdrawn the amount of fuel directly into the suction chamber of the Fuel injection pump returned.
  • a stop which limits the conveying movement of the pilot piston is preferably intended.
  • the second section delivering the upstream fuel quantity of the pilot piston one or more control bores or control edges for limitation of the pilot injection quantity, and that in a part of the bore in which the second section of the pilot piston is guided, at least one with the control bores or control edges cooperating recess for deriving the from the pilot piston delivered fuel is provided in the sense of ending the pilot injection.
  • the one which cooperates with the control bores or control edges is preferred Recess via a connecting channel with the suction chamber of the Fuel injection pump coupled. As a result, the one that is not intended for injection Part of the amount of fuel delivered by the pilot piston is returned directly.
  • control bores or control edges interacting recess with the suction space coupling connecting channel and that on the back of the fuel in the pressure chamber acted upon first section of the control piston located space of the multi-stage Bore connecting channel with the suction chamber through a common Hole formed.
  • FIG. 1 shows a partial sectional view of a fuel injection pump according to an embodiment of the invention.
  • Reference numeral 1a means a pump housing in which a pump cylinder 1b is provided.
  • Pump cylinder 1b By doing Pump cylinder 1b, a pump piston 2 is slidably mounted in the axial direction, wherein the pump piston 2 is formed on the top of the pump cylinder 1b Pressure room 3 limited.
  • the Pump piston 2 At the lower end no longer shown in the figure is the Pump piston 2 is provided with a piston foot through which the pump piston 2 by means of a cam driven by the internal combustion engine in an oscillating manner is driven.
  • the pump piston 2 is also in at the lower end of the pump piston 2 piston plunger, not shown in the figure, by means of which the pump piston 2 to control the injection duration and quantity over a predetermined angular range its axis is rotatable.
  • a pilot piston 11 is slidably provided at the pressure chamber end of the fuel injection pump.
  • the pilot piston 11 is at the pressure chamber 3 of the fuel injection pump facing front via a part 10a of the bore 10 on the pressure chamber side the connection channel 18 coupling the pressure chamber 3 from the one in the pressure chamber 3 fuel, which is pressurized by the pump piston 2, by an amount of fuel upstream of the rear of the pilot piston for pilot injection to promote in the combustion chamber of the internal combustion engine.
  • the pilot piston 11 comprises on his the front facing the pressure chamber 3 one of those in the pressure chamber 3 located fuel acted on the first section 11a, which in the larger Part 10a of diameter of the bore 10 is guided, and on its rear side a second section 11b which conveys the upstream fuel quantity and which in the the smaller diameter part 10b of the bore 10 is guided.
  • the Fuel which is upstream of the back of the pilot piston 11, is the one rear end of the part 10b of the bore 10 forming space 13 via a Delivery channel 14 delivered as a pilot injection quantity.
  • the one in the pressure chamber 3 The area of the first section 11a that can be subjected to fuel is essential greater than the area of the second section that promotes the upstream fuel quantity 11b of the pilot piston.
  • the area of that in the pressure chamber 3 is Fueled first portion 11a of the pilot piston 11 between 3 times up to 20 times, preferably between 5 times and 12 times the area of the the pilot injection amount promoting second portion 11b.
  • the area of the first section 11a is 9 times the area of the second section 11 b, corresponding to the fact that the diameter of the Bore part 10a is three times the diameter of the bore part 10b.
  • a stop 19 in the form of a Shoulder provided, which serves the stroke or the conveying movement of the Limit pilot piston 11.
  • control bores 16 are formed, which with one in the smaller Diameter part 10b of the bore 10 provided recess 15 in Interact in terms of ending the pilot injection.
  • These control holes 16 connect via an axially formed in the second portion 11b of the pilot piston 11 Bore 16a the back of the same with the recess 15 as soon as the Control bores 16, the recess 15 during the conveying movement of the pilot piston 11 to reach.
  • the recess 15 is via a connecting channel 17b, which one Continuation of the aforementioned connection channel 17a forms, also with the Suction chamber 20 of the fuel injection pump coupled.
  • the recess 15 reach the fuel upstream of the second section 11b of the pilot piston 11 more promoted to pilot injection, but via the connecting channels 17b, 17a returned to the suction chamber 20 of the fuel pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP99113377A 1999-07-10 1999-07-10 Pompe à injection de combustible à injection pilote Withdrawn EP1069307A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99113377A EP1069307A1 (fr) 1999-07-10 1999-07-10 Pompe à injection de combustible à injection pilote

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99113377A EP1069307A1 (fr) 1999-07-10 1999-07-10 Pompe à injection de combustible à injection pilote

Publications (1)

Publication Number Publication Date
EP1069307A1 true EP1069307A1 (fr) 2001-01-17

Family

ID=8238560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99113377A Withdrawn EP1069307A1 (fr) 1999-07-10 1999-07-10 Pompe à injection de combustible à injection pilote

Country Status (1)

Country Link
EP (1) EP1069307A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1576477A1 (de) * 1967-08-09 1970-02-19 Bosch Gmbh Robert Kraftstoffeinspritzventil fuer Vor- und Haupteinspritzung
EP0027442B1 (fr) * 1979-10-15 1984-09-19 Friedmann & Maier Aktiengesellschaft Pompe d'injection pour moteurs à combustion interne à injection du combustible, en particulier pour moteurs diesel et dispositif de réglage pour celle-ci
GB2194599A (en) * 1986-09-01 1988-03-09 Bosch Gmbh Robert Pilot injection device for diesel engines
DE4018535A1 (de) * 1990-06-09 1991-12-12 Orange Gmbh Kraftstoffeinspritzpumpe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1576477A1 (de) * 1967-08-09 1970-02-19 Bosch Gmbh Robert Kraftstoffeinspritzventil fuer Vor- und Haupteinspritzung
EP0027442B1 (fr) * 1979-10-15 1984-09-19 Friedmann & Maier Aktiengesellschaft Pompe d'injection pour moteurs à combustion interne à injection du combustible, en particulier pour moteurs diesel et dispositif de réglage pour celle-ci
GB2194599A (en) * 1986-09-01 1988-03-09 Bosch Gmbh Robert Pilot injection device for diesel engines
DE4018535A1 (de) * 1990-06-09 1991-12-12 Orange Gmbh Kraftstoffeinspritzpumpe

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