WO2009127485A1 - Pompe pour rampe commune haute pression et système d'alimentation en carburant pour un moteur à rampe commune comprenant ladite pompe - Google Patents

Pompe pour rampe commune haute pression et système d'alimentation en carburant pour un moteur à rampe commune comprenant ladite pompe Download PDF

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Publication number
WO2009127485A1
WO2009127485A1 PCT/EP2009/053080 EP2009053080W WO2009127485A1 WO 2009127485 A1 WO2009127485 A1 WO 2009127485A1 EP 2009053080 W EP2009053080 W EP 2009053080W WO 2009127485 A1 WO2009127485 A1 WO 2009127485A1
Authority
WO
WIPO (PCT)
Prior art keywords
common rail
pump
piston
roller
cam
Prior art date
Application number
PCT/EP2009/053080
Other languages
English (en)
Inventor
Rosanna Iorizzo
Giovanni Rizzo
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 WO2009127485A1 publication Critical patent/WO2009127485A1/fr

Links

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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F02M59/445—Selection of particular materials

Definitions

  • the present invention relates to a high-pressure common rail pump and to a fuel L O feed system for a common rail engine comprising said pump.
  • High-pressure common rail pumps are used to feed pressurized fuel in internal-combustion engines of the common rail type.
  • High-pressure common rail pumps comprise a number of pumping members (usually three) which are L 5 driven by an actuating mechanism.
  • Each of the pumping members comprises a cylinder housing internally an axially sliding piston.
  • the cylinder is connected to a feed circuit and to a delivery circuit by means of valves.
  • the piston of each pumping member is engaged with the
  • the actuating mechanism comprises a cam with, fitted idle thereon, a prismatic ring having on the outside a number of smooth faces corresponding to the number of pumping members. Each face of the prismatic ring is engaged with the base of a respective piston. The rotation of the cam by an engine causes
  • L 0 drawback relates to the fact that the prismatic ring may give rise to annoying vibrations.
  • the object of the present invention is to provide a high-pressure common rail pump and a fuel feed system for a common rail engine which do not have the L 5 abovementioned drawbacks.
  • a high-pressure common rail pump comprising:
  • the engaging means comprise a roller fitted idle on the cam.
  • a surface of a base of the piston in 30 contact with the engaging means has a barrel-like concavity.
  • a fuel feed system for a common rail engine comprising: a tank;
  • the high-pressure common rail pump is designed in accordance with any one of Claims 1 to 9.
  • FIG. 1 shows schematically a portion of a known high-pressure common rail pump in a first operating configuration
  • FIG. 1 shows the pump according to Figure 1 in a second operating configuration
  • FIG. 3 is a schematic illustration of a fuel feed system comprising a high- pressure common rail pump according to a first embodiment of the present invention
  • FIG. 30 - Figure 4 is a cross-sectional view of a part of the pump according to Figure 3;
  • FIG. 6 shows a detail of a high-pressure common rail pump according to a second embodiment of the present invention.
  • the reference number 10 denotes a fuel feed system for an internal combustion engine (not shown).
  • the feed system 10 comprises a fuel tank 11, a 5 high-pressure common rail pump 12, a low-pressure feed circuit 13, which connects the fuel tank 11 to the high-pressure common rail pump 12, and a high- pressure delivery circuit 14, which connects the high-pressure pump 12 to a common rail 16.
  • the high-pressure common rail pump 12 comprises a pump body 15, indicated schematically in Figure 3 by means of a dot-dash line, three pumping members 17 housed inside the pump body 15, and an actuating mechanism 18.
  • the three pumping members 17 are arranged radially at 120° around the L 5 actuating mechanism 18 and each comprise a piston 20 axially sliding inside a respective seat 21.
  • the portion of each seat 21 which is not occupied by the piston 20 defines a variable-volume pumping chamber and is connected to the feed circuit 13 via a feed valve 22 and to the delivery circuit 14 via a delivery valve 23. > 0
  • the three pumping members 17 are identical to each other. Below, reference will be made to only one of them, although it is understood that the description and illustration is also applicable to the other pumping members.
  • Figure 4 shows in detail a portion of the high-pressure common rail pump 12, including one of the pumping members 17 and the actuating mechanism 18.
  • the actuating mechanism 18 comprises a circular shaped cam 25 which can be operated by means of a shaft 26 connected to an engine (not shown here) and a 30 cylindrical roller 28 fitted idle on the cam 25.
  • a bearing 29 is arranged between the cam 25 and the roller 28.
  • the roller 28 acts as a member for engagement between the cam 25 and the piston 20 of the pumping member 17.
  • the outer surface of the roller 28 is circular and, in the embodiment described here, is directly engaged with the piston 20.
  • the piston 20 has a base 30 which is kept in contact with the roller 5 28 by means of an opposition spring 26. As shown also in the enlarged view of
  • a surface 30a of the base 30 of the piston 20 in contact with the roller 28 is shaped so as to favour rolling of the said roller 28.
  • the surface 30a of the base 30 has a barrel-like concavity 30b, such as to receive a portion of the roller 28.
  • the substantially cylindrical concavity 30b has an axis L 0 parallel to an axis A of the shaft 26 and a radius R 0 greater than the maximum outer radius R E of the roller 28.
  • the shape of the concavity 30b on the surface 30a of the base 30 of the piston 20 adapts to the trajectory and to the shape of the roller 28.
  • the piston 20 is formed as one piece and is therefore simpler and cheaper to manufacture.
  • the high-pressure common rail pump 112 comprises the pump body 15, pumping members 17 and an actuating mechanism 118.
  • the pumping members 17 comprise the pistons 20 and the seats 21, as already described above.
  • the base 30 of each piston 20 has a barrel-like concavity 30b.
  • the actuating mechanism 118 comprises the cam 25, connected to the shaft 26, and the roller 28, which acts as an engaging member and is fitted idle on the cam 5 25 via the bearing 29. In this case, moreover, engagement between the cam 25 and the piston 20 is performed with the aid of a bush 35 fitted on the roller 28.
  • the bush 35 is made of ceramic material and has a maximum outer radius R E '.
  • the surface 30a of the base 30 of the piston 20 is kept directly in contact with the bush 35 which is therefore arranged between the base 30 of the piston 20 and L 0 the roller 28.
  • the radius of the concavity 30b in the surface 30a is greater than the maximum outer radius R E ' of the bush 35.
  • the high-pressure common rail pump may have a different number of pumping members (for example one or two).
  • the bush arranged between the roller and the piston could be made of another material such as, for example, teflon.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)

Abstract

L'invention porte sur une pompe pour rampe commune haute pression, qui comprend un piston (20) coulissant axialement à l'intérieur d'un siège (21), une came (25) venant en prise avec le piston (20) de façon à transmettre un mouvement de va-et-vient au piston (20), et des éléments (28) pour une prise entre la came (25) et le piston (20). Les éléments de prise (28) comprennent un rouleau disposé de façon à avoir une rotation folle sur la came (25).
PCT/EP2009/053080 2008-04-17 2009-03-16 Pompe pour rampe commune haute pression et système d'alimentation en carburant pour un moteur à rampe commune comprenant ladite pompe WO2009127485A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2008A000704 2008-04-17
ITMI20080704 ITMI20080704A1 (it) 2008-04-17 2008-04-17 Pompa common rail di alta pressione e impianto di alimentazione di combustibile di un motore common rail comprendente tale pompa

Publications (1)

Publication Number Publication Date
WO2009127485A1 true WO2009127485A1 (fr) 2009-10-22

Family

ID=40296959

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/053080 WO2009127485A1 (fr) 2008-04-17 2009-03-16 Pompe pour rampe commune haute pression et système d'alimentation en carburant pour un moteur à rampe commune comprenant ladite pompe

Country Status (2)

Country Link
IT (1) ITMI20080704A1 (fr)
WO (1) WO2009127485A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101746A1 (it) * 2010-09-27 2012-03-28 Bosch Gmbh Robert Pompa di alta pressione per alimentare combustibile ad un motore a combustione interna
US20120186559A1 (en) * 2011-01-24 2012-07-26 Denso Corporation Fuel pump
RU2553593C1 (ru) * 2013-11-26 2015-06-20 Российская Федерация от имени которой выступает Министерство промышленности и торговли Российской Федерации Топливный насос высокого давления аккумуляторной топливной системы двигателя внутреннего сгорания

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020189438A1 (en) * 2001-06-19 2002-12-19 Katsunori Furuta Fuel injection pump
WO2004036031A1 (fr) * 2002-10-11 2004-04-29 Robert Bosch Gmbh Pompe a pistons radiaux pour alimentation en carburant sous haute pression
DE10326880A1 (de) * 2003-06-14 2004-12-30 Daimlerchrysler Ag Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen
WO2005052356A2 (fr) * 2003-11-25 2005-06-09 Robert Bosch Gmbh Pompe a haute pression, notamment pour un systeme d'injection de carburant de moteur a combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020189438A1 (en) * 2001-06-19 2002-12-19 Katsunori Furuta Fuel injection pump
WO2004036031A1 (fr) * 2002-10-11 2004-04-29 Robert Bosch Gmbh Pompe a pistons radiaux pour alimentation en carburant sous haute pression
DE10326880A1 (de) * 2003-06-14 2004-12-30 Daimlerchrysler Ag Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung bei Kraftstoffeinspritzsystemen von Brennkraftmaschinen
WO2005052356A2 (fr) * 2003-11-25 2005-06-09 Robert Bosch Gmbh Pompe a haute pression, notamment pour un systeme d'injection de carburant de moteur a combustion interne

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101746A1 (it) * 2010-09-27 2012-03-28 Bosch Gmbh Robert Pompa di alta pressione per alimentare combustibile ad un motore a combustione interna
US20120186559A1 (en) * 2011-01-24 2012-07-26 Denso Corporation Fuel pump
US9109558B2 (en) * 2011-01-24 2015-08-18 Denso Corporation Fuel pump
RU2553593C1 (ru) * 2013-11-26 2015-06-20 Российская Федерация от имени которой выступает Министерство промышленности и торговли Российской Федерации Топливный насос высокого давления аккумуляторной топливной системы двигателя внутреннего сгорания

Also Published As

Publication number Publication date
ITMI20080704A1 (it) 2009-10-18

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