EP2612017B1 - Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine and associated assembly method - Google Patents

Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine and associated assembly method Download PDF

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Publication number
EP2612017B1
EP2612017B1 EP11746265.5A EP11746265A EP2612017B1 EP 2612017 B1 EP2612017 B1 EP 2612017B1 EP 11746265 A EP11746265 A EP 11746265A EP 2612017 B1 EP2612017 B1 EP 2612017B1
Authority
EP
European Patent Office
Prior art keywords
piston
support plate
seat
diameter
pump unit
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.)
Not-in-force
Application number
EP11746265.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2612017A1 (en
Inventor
Gaetano Riglietti
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 EP2612017A1 publication Critical patent/EP2612017A1/en
Application granted granted Critical
Publication of EP2612017B1 publication Critical patent/EP2612017B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M59/02—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
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections

Definitions

  • the present invention relates to a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • the present invention relates to a pump unit comprising a pump body; a piston pump designed to feed the fuel to an internal combustion engine; and a gear pump designed to feed the fuel to the piston pump.
  • the piston pump comprises at least one cylinder which is formed in the pump body; and a piston engaged slidably inside the cylinder so as to perform an intake stroke for drawing the fuel into the cylinder under the thrust of a spring arranged between the pump body and a support plate mounted on the piston and a compression stroke for compressing the fuel contained inside the cylinder under the thrust of an actuating device.
  • the support plate has an opening, which is formed through the support plate, parallel to a longitudinal axis of the piston, and comprises a seat for inserting the piston through the support plate, a seat for engaging the piston in the support plate, and a communicating section for allowing the piston to pass between the insertion seat and the engaging seat.
  • the piston is provided with an annular groove, which is formed on the outer surface of the piston and has a diameter slightly greater than a width of the communicating section;
  • the insertion seat has a substantially circular shape and a diameter slightly greater than a diameter of the piston; and
  • the engaging seat has a substantially circular shape and a diameter slightly greater than the diameter of the annular groove.
  • the piston and the support plate are firstly displaced axially with respect to each other until the annular groove is radially aligned with the communicating section and are then displaced radially with respect to each other so as to transfer the piston from the insertion seat into the engaging seat by moving the annular groove through the communicating section.
  • the known pump units of the type described above have a number of drawbacks due principally to the fact that assembly of the support plate on the piston may cause damage to the annular groove, separation of metal particles from the piston and, therefore, reduction of the fatigue strength of the piston and seizing of the piston inside the cylinder.
  • the object of the present invention is to provide a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the drawbacks described above and which is simple and inexpensive to produce.
  • a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine as claimed in Claims 1 to 12 is provided.
  • the present invention also relates to a method for assembling a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • a method for assembling a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine as claimed in Claims 13 to 17 is provided.
  • 1 denotes, in its entirety, a pump unit for feeding fuel, in particular diesel fuel, to an internal combustion engine (not shown).
  • the pump unit 1 comprises a pump body 2 provided with a central hole (not shown) having a given longitudinal axis 3; a piston pump 4 designed to feed the fuel to the said internal combustion engine (not shown); and a gear pump, known and not shown, designed to feed the fuel to the pump 4.
  • the pump 4 comprises a plurality of cylinders 5 (only one of which is shown in Figure 1 ) which are formed in the pump body 2, are uniformly distributed around the axis 3 and have respective longitudinal axes 6 substantially perpendicular to the axis 3.
  • Each cylinder 5 is slidably engaged by an associated piston 7 which is mounted inside the cylinder 5 coaxially with the axis 6, has a diameter D1 and is provided with an annular groove 8 ( Figure 2 ) which is formed on an outer surface of the piston 7 at an intermediate point of the piston 7 itself and has a diameter D2 smaller than the diameter D1.
  • the pistons 7 are displaced with an alternating rectilinear movement along the associated cylinders 5 by an actuating device 9 comprising, in the case in question, a drive shaft (not shown) which extends through the pump body 2 coaxially with the axis 3, is mounted so as to rotate, relative to the pump body 2, about the axis 3 and has an eccentric portion engaged rotatably, via a rolling bearing (not shown), through a sleeve (not shown).
  • actuating device 9 comprising, in the case in question, a drive shaft (not shown) which extends through the pump body 2 coaxially with the axis 3, is mounted so as to rotate, relative to the pump body 2, about the axis 3 and has an eccentric portion engaged rotatably, via a rolling bearing (not shown), through a sleeve (not shown).
  • the sleeve (not shown) has a longitudinal axis parallel to the axis 3 and is bounded externally by a cylindrical surface provided with a plurality of flat faces equal in number to the number of cylinders 5 and each facing a respective disk element (not shown) arranged between an associated piston 7 and the flat face itself.
  • the actuating device 9 furthermore comprises, for each piston 7, a respective spring 10 which is mounted coaxially with the associated axis 6, is arranged between the pump body 2 and a substantially flat support plate 11 mounted on the piston 7, perpendicularly with respect to the associated axis 6, and is designed to displace - and normally keep - the piston 7 itself in contact with the associated disk element (not shown).
  • each piston 7 is displaced by the associated spring 10 during an outward intake stroke for drawing the fuel into the associated cylinder 5 and by the eccentric portion of the drive shaft (not shown), by the sleeve (not shown) and by the associated washer (not shown) during a return compression stroke for compressing the fuel contained inside the said associated cylinder 5.
  • the plate 11 has an opening 12 which is formed through the plate 11, parallel to the axis 6, has a plane S of symmetry substantially coplanar with the axis 6, is bounded by a shaped side wall 13 and comprises a seat 14 for inserting the piston 7 through the plate 11, a seat 15 for engaging the piston 7 in the plate 11, and a communicating section 16 allowing passage between the seat 14 and the seat 15.
  • the seat 14 has a substantially circular shape, a centre C1 of curvature different from the axis 6, and a diameter D3 slightly greater than the diameter D1 of the piston 7; and the seat 15 has a substantially circular shape, a centre C2 of curvature substantially arranged along the axis 6, and a diameter D4 which is slightly smaller than the diameter D1 of the piston 7 and slightly greater than the diameter D2 of the groove 8.
  • the communicating section 16 is bounded laterally by two elastically deformable arms 17 which project from the wall 13 inside the opening 12, extend on opposite sides of the plane S and have respective free ends 18 provided, in the case in question, with respective holes 19 formed in the plate 11, parallel to the axis 6.
  • the arms 17 are arranged, normally, in an initial narrow configuration ( Figure 3 ) where the section 16 has a width L1, measured perpendicularly with respect to the plane S, which is slightly smaller than the diameter D2 of the groove 8 and where each arm 17 has a substantially V-shaped form and cooperates with the other arm 17 so as to define part of the seat 14 and part of the seat 15.
  • the opening 12 further comprises two recesses 20, which are formed on opposite sides of the plane S and are each bounded by the wall 13 and by an associated arm 17.
  • the groove 8 has, in the case in question, a height H greater than the thickness of the plate 11, the plate 11 is finally displaced axially in contact with the piston 7.
  • the final widened configuration of the arms 17 allows the piston 7 to be displaced radially from the seat 14 into the seat 15 without interfering with the section 16 and therefore avoids damage to the groove 8, separation of metal particles from the piston 7, reduction in the fatigue strength of the piston 7 and seizing of the piston 7 inside the cylinder 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP11746265.5A 2010-09-01 2011-08-24 Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine and associated assembly method Not-in-force EP2612017B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2010A001594A IT1401914B1 (it) 2010-09-01 2010-09-01 Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna e relativo metodo di assemblaggio
PCT/EP2011/064537 WO2012028507A1 (en) 2010-09-01 2011-08-24 Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine and associated assembly method

Publications (2)

Publication Number Publication Date
EP2612017A1 EP2612017A1 (en) 2013-07-10
EP2612017B1 true EP2612017B1 (en) 2014-12-10

Family

ID=43466886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11746265.5A Not-in-force EP2612017B1 (en) 2010-09-01 2011-08-24 Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine and associated assembly method

Country Status (7)

Country Link
EP (1) EP2612017B1 (zh)
JP (1) JP5654682B2 (zh)
KR (1) KR20130103718A (zh)
CN (1) CN103080530B (zh)
IT (1) IT1401914B1 (zh)
RU (1) RU2573434C2 (zh)
WO (1) WO2012028507A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20131903A1 (it) * 2013-11-15 2015-05-16 Bosch Gmbh Robert Pompa di alta pressione per alimentare combustibile ad un motore a combustione interna
JP6453451B2 (ja) * 2014-10-09 2019-01-16 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング 燃料、好ましくはディーゼル油を内燃機関に供給するためのポンプユニット
CN111465762B (zh) * 2017-12-13 2022-06-07 罗伯特·博世有限公司 用于将燃料、优选柴油燃料供给到内燃机的泵送单元

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5129380Y2 (zh) * 1972-03-14 1976-07-24
JPS4917936U (zh) * 1972-05-26 1974-02-15
DE8708761U1 (zh) * 1987-06-24 1988-10-20 Robert Bosch Gmbh, 7000 Stuttgart, De
SU1574887A1 (ru) * 1988-05-13 1990-06-30 Центральный Научно-Исследовательский Институт По Моторостроению Топливоподающий агрегат
DE4310192C2 (de) * 1992-07-28 2001-05-31 Matsushita Electric Works Ltd Schnellanschlußkupplung
DE9401501U1 (de) * 1994-01-29 1994-03-10 Voss Armaturen Steckkupplung für Druckleitungssysteme
JP3837185B2 (ja) * 1996-05-22 2006-10-25 本田技研工業株式会社 スナップリング
IT1289796B1 (it) * 1996-12-23 1998-10-16 Elasis Sistema Ricerca Fiat Perfezionamenti ad un dispositivo a pompa per l'alimentazione del carburante da un serbatoio ad un motore a combustione interna.
DE19809315A1 (de) * 1998-03-05 1999-09-09 Bosch Gmbh Robert Radialkolbenpumpe zur Kraftstoffhochdruckerzeugung
JP3867758B2 (ja) * 1999-06-22 2007-01-10 株式会社デンソー 高圧サプライポンプ
DE10200792A1 (de) * 2002-01-11 2003-07-31 Bosch Gmbh Robert Kraftstoffpumpe für eine Brennkraftmaschine
DE10236853A1 (de) * 2002-08-10 2004-02-26 Continental Teves Ag & Co. Ohg Radialkolbenpumpe, insbesondere für eine schlupfgeregelte Bremsanlage
JP2004218459A (ja) * 2003-01-10 2004-08-05 Bosch Automotive Systems Corp 燃料供給用ポンプおよびタペット構造体
US20050100466A1 (en) * 2003-01-09 2005-05-12 Nobuo Aoki Fuel supply pump
CN100410526C (zh) * 2004-01-14 2008-08-13 博世株式会社 燃料供给泵及挺杆结构体
WO2006037676A1 (de) * 2004-10-06 2006-04-13 Siemens Aktiengesellschaft RADIALKOLBENPUMPE MIT ROLLENSTÖßEL

Also Published As

Publication number Publication date
IT1401914B1 (it) 2013-08-28
EP2612017A1 (en) 2013-07-10
KR20130103718A (ko) 2013-09-24
WO2012028507A1 (en) 2012-03-08
RU2013114165A (ru) 2014-10-10
JP5654682B2 (ja) 2015-01-14
ITMI20101594A1 (it) 2012-03-02
JP2013540930A (ja) 2013-11-07
RU2573434C2 (ru) 2016-01-20
CN103080530B (zh) 2016-01-13
CN103080530A (zh) 2013-05-01

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