EP1911965A1 - Pompe d injection de carburant pour moteur à combustion interne - Google Patents

Pompe d injection de carburant pour moteur à combustion interne Download PDF

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Publication number
EP1911965A1
EP1911965A1 EP06767553A EP06767553A EP1911965A1 EP 1911965 A1 EP1911965 A1 EP 1911965A1 EP 06767553 A EP06767553 A EP 06767553A EP 06767553 A EP06767553 A EP 06767553A EP 1911965 A1 EP1911965 A1 EP 1911965A1
Authority
EP
European Patent Office
Prior art keywords
diameter hole
large diameter
small diameter
cum
hole
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Withdrawn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
EP06767553A
Other languages
German (de)
English (en)
Inventor
Ryo c/o Bosch Corporation TAKAHASHI
Toshitaka c/o Bosch Corporation MARUYAMA
Masaaki c/o Bosch Corporation OGINO
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.)
Bosch Corp
Original Assignee
Bosch Corp
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 Bosch Corp filed Critical Bosch Corp
Publication of EP1911965A1 publication Critical patent/EP1911965A1/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Withdrawn legal-status Critical Current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
    • F02M59/38—Pumps characterised by adaptations to special uses or conditions
    • 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
    • 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
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston

Definitions

  • the present invention relates to a fuel injection pump for an internal combustion engine that can reduce the occurrence of cavitation erosion.
  • the fuel jet that occurs early flows into the inlet-cum-overflow hole along the slope of the bottom portion thereof, and cavities that have formed inside the inlet-cum-overflow hole are discharged towards the inlet-cum-overflow hole, so there can be expected an effect where cavitation erosion, which exerts an adverse action inside the inlet-cum-overflow hole, is circumvented from occurring inside this hole or is at least reduced.
  • a fuel injection pump for an internal combustion engine configured such that incoming and outgoing of fuel to at least one inlet-cum-overflow hole formed in a pump plunger bush are controlled by a pump plunger that reciprocally moves inside the pump plunger bush, with an early control groove being formed in a wall portion of the inlet-cum-overflow hole, wherein the inlet-cum-overflow hole includes a small diameter hole having in one end thereof an opening that looks into the inside of the pump plunger bush and a large diameter hole that is communicated with the other end of the small diameter hole, the early control groove is disposed so as to extend towards the large diameter hole from the opening of the small diameter hole, a bottom portion of the early control groove slopingly extends upward in a direction away from the opening, an inner surface of the communicating end portion of the large diameter hole that is communicated with the small diameter hole has a curved surface shape, and an end edge of an open end portion of the large diameter hole is chamfered.
  • the effect of cavitation erosion resulting from the bursting of cavities within high-pressure fuel can be remarkably reduced and deterioration of the lifespan of the fuel injection pump can be effectively controlled.
  • FIG. 1 is a cross-sectional diagram showing an embodiment of a fuel injection pump according to the present invention.
  • a fuel injection pump 1 is for injecting and supplying high-pressure fuel that has been pressurized to an internal combustion engine
  • 2 is a casing
  • 3 is a pump plunger bush that is fitted inside the casing
  • 4 is a pump plunger
  • 5 is a plunger chamber defined by the pump plunger bush 3 and the pump plunger 4.
  • 6 is a pressure valve and 7 is a pressure valve casing, and the pressure valve casing 7 is screwed to the casing 2.
  • a fuel inlet-cum-overflow hole 8 is formed in the pump plunger bush 3, and an inlet-cum-overflow chamber 9 is formed in the casing 2 so as to face the inlet-cum-overflow hole 8. Additionally, an early control groove 10 is formed in the inlet-cum-overflow hole 8.
  • An upper control edge portion 11 and a lower control edge portion 12 are formed in the pump plunger 4, and the upper control edge portion 11 and the lower control edge portion 12 slide over the early control groove 10 because of the motion in the axial line direction of the pump plunger 4.
  • the lower control edge portion 12 that regulates supply completion first slides over the slopingly extending early control groove 10 during supply completion and thereafter opens an entire open surface 14 of the inlet-cum-overflow hole 8.
  • the pressure inside the inlet-cum-overflow chamber 9 increases relatively gradually because of the jet of fuel that slopingly flows in early.
  • FIG. 2 is a cross-sectional diagram along line A-A in FIG. 1
  • FIG. 3 is a diagram seen from the direction of arrow B in FIG. 2
  • FIG. 4 is a cross-sectional diagram along line C-C in FIG. 3 .
  • the inlet-cum-overflow hole 8 is disposed with a cylindrical small diameter hole 81 whose one end 81A has the open surface 14 that opens towards the pump plunger 4 and a large diameter hole 82 whose one end 82A opens towards the inlet-cum-overflow chamber 9 and whose diameter is larger than the diameter of the small diameter hole 81, with the inner surface of the other end portion of the large diameter hole 82 serving as a curved surface portion 82C. Additionally, another end 81B of the small diameter hole 81 is communicated with the large diameter hole 82 so as to look inside the large diameter hole 82 from part of the curved surface portion 82C that is formed as a bottom surface on the other end portion of the large diameter hole 82.
  • an axial line 81x of the small diameter hole 81 and an axial line 82x of the large diameter hole 82 are offset a predetermined value k from each other.
  • This offset direction is a direction where the axial line 82x is opposite the early control groove 10 with respect to the axial line 81x.
  • the early control groove 10 is formed in part of the small diameter hole 81 as a gutter-like groove having a cross-sectionally circular arc-shaped bottom surface 10A, and the bottom surface 10A of the early control groove 10 slopes so as to form an angle ⁇ with respect to the axial line 81x (see FIG. 4 ).
  • an end edge of the open end portion of the large diameter hole 82 is chamfered so as to have a configuration that can alleviate impact force resulting from the bursting of cavities acting on the end edge of the open end portion of the large diameter hole 82, so that instances where the end edge 82M sustains damage because of cavitation erosion can be controlled.
  • this chamfering is cornered chamfering, but it may also be round chamfering or another appropriate chamfering.
  • Fuel intake is performed in a state where the pump plunger 4 is lowered and the upper control edge portion 11 opens the open surface 14 of the small diameter hole 81 to the plunger chamber 5.
  • Fuel pressurization inside the plunger chamber 5 is started when the pump plunger 4 rises so that the upper control edge portion 11 blocks the open surface 14 from the plunger chamber 5, and high-pressure fuel obtained as a result of being pressurized inside the plunger chamber 5 when the lower control edge portion 12 begins to open the early control groove 10 flows into the inlet-cum-overflow hole 8 as a fuel jet along the early control groove 10.
  • This fuel jet flows along the bottom surface 10A of the early control groove 10, so the flow direction thereof is the direction indicated by arrow R which is parallel to the bottom surface 10A (see FIG. 4 ).
  • the fuel jet flowing in from the small diameter hole 81 is swiftly sent inside the large diameter hole 82, but as mentioned previously, because the axial lines 81x and 82x are offset the predetermined value k from each other and the curved surface portion 82C is formed in the bottom surface of the other end portion of the large diameter hole 82, a wide space is ensured in front of the fuel jet sent inside the large diameter hole 82.
  • the curved surface portion 82C has the shape of part of a sphere to ensure a wide space in front of the fuel jet, but as long as this wide space can be ensured, the shape of the curved surface portion 82C may be any curved surface shape and is not limited to the present embodiment.
  • the fuel injection pump for an internal combustion engine according to the present invention can further reduce the occurrence of cavitation erosion and is useful for the improvement of a fuel injection pump for an internal combustion engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP06767553A 2005-07-20 2006-06-22 Pompe d injection de carburant pour moteur à combustion interne Withdrawn EP1911965A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005209457A JP2007023948A (ja) 2005-07-20 2005-07-20 内燃機関のための燃料噴射ポンプ
PCT/JP2006/312936 WO2007010719A1 (fr) 2005-07-20 2006-06-22 Pompe d’injection de carburant pour moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP1911965A1 true EP1911965A1 (fr) 2008-04-16

Family

ID=37668605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06767553A Withdrawn EP1911965A1 (fr) 2005-07-20 2006-06-22 Pompe d injection de carburant pour moteur à combustion interne

Country Status (5)

Country Link
EP (1) EP1911965A1 (fr)
JP (1) JP2007023948A (fr)
KR (1) KR20080028491A (fr)
CN (1) CN101228349A (fr)
WO (1) WO2007010719A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008027651A1 (de) * 2008-06-10 2009-12-17 Man Diesel Se Einspritzpumpe für eine Brennkraftmaschine und Brennkraftmaschine mit Einspritzpumpe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102364081A (zh) * 2011-11-09 2012-02-29 王晓燕 一种柱塞式单体供油泵

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3902764C2 (de) * 1989-01-31 2002-10-17 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
JPH0754618A (ja) 1993-08-09 1995-02-28 Yamaha Motor Co Ltd 多弁式内燃機関

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007010719A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008027651A1 (de) * 2008-06-10 2009-12-17 Man Diesel Se Einspritzpumpe für eine Brennkraftmaschine und Brennkraftmaschine mit Einspritzpumpe

Also Published As

Publication number Publication date
JP2007023948A (ja) 2007-02-01
CN101228349A (zh) 2008-07-23
WO2007010719A1 (fr) 2007-01-25
KR20080028491A (ko) 2008-03-31

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