EP1657429A1 - Hochdruckpumpe für eine Brennkraftmaschine - Google Patents

Hochdruckpumpe für eine Brennkraftmaschine Download PDF

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Publication number
EP1657429A1
EP1657429A1 EP04425838A EP04425838A EP1657429A1 EP 1657429 A1 EP1657429 A1 EP 1657429A1 EP 04425838 A EP04425838 A EP 04425838A EP 04425838 A EP04425838 A EP 04425838A EP 1657429 A1 EP1657429 A1 EP 1657429A1
Authority
EP
European Patent Office
Prior art keywords
fuel
pump
inlet mouth
pumping element
compartment
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Withdrawn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
EP04425838A
Other languages
English (en)
French (fr)
Inventor
Mario C.R.F. Società Consortile per Azioni Ricco
Sisto Luigi De Matthaeis
Annunziata Anna Satriano
Sergio Stucchi
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.)
Centro Ricerche Fiat SCpA
Original Assignee
Centro Ricerche Fiat SCpA
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 Centro Ricerche Fiat SCpA filed Critical Centro Ricerche Fiat SCpA
Priority to EP04425838A priority Critical patent/EP1657429A1/de
Priority to JP2005123746A priority patent/JP2006138309A/ja
Publication of EP1657429A1 publication Critical patent/EP1657429A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a high-pressure pump and to a compression assembly for an internal-combustion engine.
  • fuel-injection systems comprising a tank for accumulation of the fuel and a system for compression of the fuel, which is fluidically connected to the tank itself and is provided so as to make the fuel available to the engine at a pre-set pressure.
  • the compression system generally comprises a priming pump for the fuel contained in the tank and a compression assembly for making the fuel available, possibly via a common rail, to a plurality of injectors associated to respective combustion chambers of the engine itself.
  • the compression assembly comprises a high-pressure pump and a distribution circuit set between the priming pump and the high-pressure pump to make the fuel available to the high-pressure pump itself.
  • the high-pressure pump has a full body, generally made of cast iron, inside which there is made a hollow chamber, referred to as "guard".
  • the guard houses: a plurality of pumping elements designed to compress the fuel; a portion of a shaft for controlling the pumping elements, which is, in turn, actuated by the internal-combustion engine or by an auxiliary motor; and a cam designed to transmit motion from the shaft to each pumping element.
  • each pumping element has an intake valve for regulating delivery of the fuel to be compressed by the distribution circuit, and a discharge valve for exit of the compressed fuel to the engine.
  • the fuel in addition to being compressed in the pumping elements, performs a further function of lubrication and cooling of the guard, shaft, cams and pumping elements.
  • a pipe for delivery of the fuel coming from the distribution circuit traverses the full body of the high-pressure pump and connects the guard to a single inlet mouth made in the body itself.
  • a plurality of pipes for supplying the respective pumping elements branches off from the delivery pipe, in a position between the inlet mouth and the guard, and extends as far as the respective pumping elements.
  • the delivery pipe does not present any branching and is provided with a plurality of supply pipes extending from the guard as far as the respective pumping elements.
  • each supply pipe is made within the body of the pump and supplies the corresponding pumping element through the corresponding intake valve.
  • the fuel with reference to the embodiment according to which it reaches the pumping elements after having cooled the guard directly, may be contaminated by possible machining swarf and by impurities generated by the detachment of parts of members in mutual contact. In this circumstance, there could arise faulty operation of the high-pressure pump and the need for burdensome and frequent maintenance interventions.
  • the purpose of the present invention is to provide a high-pressure pump for an internal-combustion engine, which is without the drawbacks linked to known high-pressure pumps and specified above.
  • the present invention likewise relates to a compression assembly for an internal-combustion engine, as defined in Claim 3.
  • the system 1 is illustrated only as far as is required for an understanding of the present invention, and basically comprises a tank 2 for the fuel and a compression system 3 fluidically connected to the tank 2 and designed to compress the fuel taken in from the tank 2 to make it available to the internal-combustion engine at the desired pressure.
  • the compression system 3 comprises a priming pump 4 immersed in the tank 2 and a compression assembly 5 fluidically connected to the priming pump 4 for compressing the fuel to a pre-set pressure value.
  • the compression assembly 5 comprises a circuit 6 for distribution of the fuel, fluidically connected to the priming pump 4, and a high-pressure pump 7, supplied by the circuit 6 and fluidically connected to the internal-combustion engine.
  • the circuit 6 is preferably made of a material with low thermal conductivity, is fluidically set between the priming pump 4 and the high-pressure pump 7, and comprises: a pipe 9 connected to the priming pump 4; one or more supply pipes 8 (in the case in point illustrated two in number), for supplying the fuel to the high-pressure pump 7; and a pipe 10 for lubrication/cooling of the high-pressure pump 7 itself.
  • the pipe 9 connects the priming pump 4 to a union tee 11, from which there depart the lubrication/cooling pipe 10 and a connector pipe 30.
  • the connector pipe 30 terminates in a position corresponding to a further union tee 12, from which there depart the supply pipes 8, which extend as far as the high-pressure pump 7.
  • the supply pipes 8 lie on the outside of the high-pressure pump 7 and are distinct from one another and from the lubrication/cooling pipe 10.
  • a flow regulator 23 with fixed cross section is moreover provided on the lubrication/cooling pipe 10 in a position between the union tee 11 and the high-pressure pump 7.
  • the aforesaid flow regulator 23 is sized on the basis of the design characteristics of the high-pressure pump 7 so as to enable passage of a flow of fuel sufficient to lubricate/cool the high-pressure pump 7.
  • the high-pressure pump 7 comprises one or more pumping elements 13 (in the case in point two in number), provided for compressing the fluid to a pre-set pressure and actuated, via a cam 18, by a shaft 19 operatively connected to the internal-combustion engine.
  • each pumping element 13 has an intake valve 14, for delivery of the fuel to be compressed coming from the corresponding supply pipe 8, and a discharge valve 15, for outflow of the compressed fuel to the internal-combustion engine.
  • Each pumping element 13 is moreover connected, downstream of the discharge valve 15, to a respective delivery pipe 25 set at least in part on the outside of the high-pressure pump 7.
  • the high-pressure pump 7 is defined by a full body 16, generally made of a thermoconductive material, made inside which is a cavity, referred to hereinafter by the term "guard" 17, which houses the pumping elements 13, the cam 18, and an end portion of the shaft 19.
  • the guard 17 comprises a chamber 32 set in a centroidal position within the body 16 and designed to house the shaft 19, the cam 18, and a portion of the pumping elements 13.
  • the guard 17 further comprises a pair of liners 33 communicating with the chamber 32, each of which defines a seat for the motion of a respective pumping element 13 and houses a return spring acting on the pumping element 13 itself.
  • Each liner 33 is fluidically connected to the intake valve 14 and discharge valve 15 of the respective pumping element 13 via an intake pipe 34 and a discharge pipe 36, respectively, made within the body 16.
  • the body 16 moreover has an inlet mouth 20 to enable delivery of the fuel for cooling and lubrication of the guard 17 through the lubrication/cooling pipe 10.
  • the lubrication/cooling pipe 10 is in part housed within the body 16 and terminates in the guard 17.
  • the body 16 further has one or more inlet mouths 21, in the case in point two in number, to enable, through the respective supply pipes 8, delivery of the fuel with which to supply the respective pumping elements 13, said fuel coming directly from an external source, in the specific case defined by the tank 2.
  • each intake valve 14 connects a respective pumping element 13 to a respective supply pipe 8 and is set within the body 16 in the proximity of a respective inlet mouth 21.
  • the body 16 has an outlet mouth 22 traversed by a recirculation pipe 24 connecting the guard 17 to the tank 2 and designed to take the fuel used for cooling and lubricating the guard 17 back into the tank 2 itself.
  • the body 16 has one or more outlet mouths 27, in the case in point two in number, to enable, through respective delivery pipes 25, outflow of the fuel compressed by the respective pumping elements 13.
  • each discharge valve 15 is fluidically set between the respective pumping element 13 and the respective delivery pipe 25, and is housed in the proximity of the respective outlet mouth 27 and within the body 16 of the high-pressure pump 7.
  • the delivery pipes 25 converge in a union tee 29 from which there departs a single supply pipe 28 of the engine.
  • the fuel present in the tank 2 is taken up and precompressed by the priming pump 4 and sent, via the circuit 6, to the high-pressure pump 7.
  • the fuel at outlet from the priming pump 4 fills the pipe 9 and subsequently, via the union tee 11, according to proportions that are established by the flow regulator 23, flows partly into the lubrication/cooling pipe 10 and partly into the connector pipe 30.
  • the fuel that flows into the lubrication/cooling pipe 10 accesses the body 16 of the high-pressure pump 7 through the inlet mouth 20 and then fills the guard 17, lubricating and cooling the pumping elements 13, the cam 18, and the shaft 19.
  • the fuel that has cooled and lubricated the guard 17 fills the recirculation pipe 24 and, through the outlet mouth 22, leaves the body 16 and is sent back into the tank 2.
  • each inlet mouth 21 feeds, through the respective intake valve 14, the respective pumping element 13 by which it is compressed up to a given pressure.
  • the compressed fuel is discharged, through the respective discharge valve 15, from each pumping element 13, and leaves the body 16 via the respective outlet mouths 27, filling the respective delivery pipes 25.
  • the fuel that flows into each delivery pipe 25, through the union tee 29, is collected in the supply pipe 28 of the internal-combustion engine.
  • the fuel is at a level of temperature similar to that present in the tank 2 and presents a non-whirling motion.
  • the fuel is supplied to the intake valves 14 relatively "cold", i.e., not subjected to any heating due to the preliminary passage through the high-pressure pump 7.
  • the efficiency of said pump is therefore optimal in so far as it does not undergo any decrease due to the high temperature of the fuel at inlet to the intake valves 14 and to the presence of whirling motion of the fuel itself.
  • the fuel that is to be compressed in the pumping elements 13 is not contaminated by any possible machining swarf or by impurities present in the guard 17.
  • the circuit 6 could be made of a material that is not thermoinsulating and connected to the high-pressure pump 7 via thermoinsulating connection means.
  • circuit 6 could be made of a material that is not thermoinsulating and constrained to one or more intermediate elements set at a sufficient distance from the high-pressure pump 7 as to contain heating of the fuel prior to intake into the pump 7 itself.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP04425838A 2004-11-12 2004-11-12 Hochdruckpumpe für eine Brennkraftmaschine Withdrawn EP1657429A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04425838A EP1657429A1 (de) 2004-11-12 2004-11-12 Hochdruckpumpe für eine Brennkraftmaschine
JP2005123746A JP2006138309A (ja) 2004-11-12 2005-04-21 内部燃焼エンジン用の高圧ポンプ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425838A EP1657429A1 (de) 2004-11-12 2004-11-12 Hochdruckpumpe für eine Brennkraftmaschine

Publications (1)

Publication Number Publication Date
EP1657429A1 true EP1657429A1 (de) 2006-05-17

Family

ID=34932877

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425838A Withdrawn EP1657429A1 (de) 2004-11-12 2004-11-12 Hochdruckpumpe für eine Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP1657429A1 (de)
JP (1) JP2006138309A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20081928A1 (it) * 2008-10-31 2010-05-01 Bosch Gmbh Robert Metodo ed impianto di alimentazione di combustibile ad un motore a combustione interna
US10774775B2 (en) 2016-07-05 2020-09-15 Ford Global Technologies, Llc Direct-injection, supercharged internal combustion engine with high-pressure fuel pump, and method for operating an internal combustion engine of said type

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4624961B2 (ja) * 2006-06-13 2011-02-02 株式会社ニッキ 燃料供給システム
DE102015219415B4 (de) 2015-10-07 2020-07-09 Vitesco Technologies GmbH Kraftstoffhochdruckpumpe sowie Kraftstoffversorgungseinrichtung für eine Verbrennungskraftmaschine, insbesondere eines Kraftwagens

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5501196A (en) * 1993-12-28 1996-03-26 Technoflow Tube-Systems Gmbh Fuel-injection system for motor-vehicle engine
US20030029423A1 (en) * 2001-08-08 2003-02-13 Peter Boehland Method, computer program, control and/or regulating unit, and fuel system for an internal combustion engine, in particular with direct injection
US20030037768A1 (en) * 2001-08-08 2003-02-27 Sebastian Kanne Method, computer program, control and/or regulating unit, and fuel system for an internal combustion engine
DE10259178A1 (de) * 2002-12-18 2004-07-08 Robert Bosch Gmbh Hochdruckpumpe für eine Kraftstoffspritzeinrichtung einer Brennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5501196A (en) * 1993-12-28 1996-03-26 Technoflow Tube-Systems Gmbh Fuel-injection system for motor-vehicle engine
US20030029423A1 (en) * 2001-08-08 2003-02-13 Peter Boehland Method, computer program, control and/or regulating unit, and fuel system for an internal combustion engine, in particular with direct injection
US20030037768A1 (en) * 2001-08-08 2003-02-27 Sebastian Kanne Method, computer program, control and/or regulating unit, and fuel system for an internal combustion engine
DE10259178A1 (de) * 2002-12-18 2004-07-08 Robert Bosch Gmbh Hochdruckpumpe für eine Kraftstoffspritzeinrichtung einer Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20081928A1 (it) * 2008-10-31 2010-05-01 Bosch Gmbh Robert Metodo ed impianto di alimentazione di combustibile ad un motore a combustione interna
US10774775B2 (en) 2016-07-05 2020-09-15 Ford Global Technologies, Llc Direct-injection, supercharged internal combustion engine with high-pressure fuel pump, and method for operating an internal combustion engine of said type

Also Published As

Publication number Publication date
JP2006138309A (ja) 2006-06-01

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