EP1733145A1 - Unite de cylindre a piston plongeur haute pression - Google Patents

Unite de cylindre a piston plongeur haute pression

Info

Publication number
EP1733145A1
EP1733145A1 EP05716010A EP05716010A EP1733145A1 EP 1733145 A1 EP1733145 A1 EP 1733145A1 EP 05716010 A EP05716010 A EP 05716010A EP 05716010 A EP05716010 A EP 05716010A EP 1733145 A1 EP1733145 A1 EP 1733145A1
Authority
EP
European Patent Office
Prior art keywords
piston
pump
pressure
cylinder
centering cone
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.)
Granted
Application number
EP05716010A
Other languages
German (de)
English (en)
Other versions
EP1733145B1 (fr
Inventor
Gerhard Domberger
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.)
MAN Energy Solutions SE
Original Assignee
MAN B&W Diesel 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 MAN B&W Diesel GmbH filed Critical MAN B&W Diesel GmbH
Publication of EP1733145A1 publication Critical patent/EP1733145A1/fr
Application granted granted Critical
Publication of EP1733145B1 publication Critical patent/EP1733145B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • 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
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • 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 invention relates to a high-pressure pump-piston-cylinder unit, in particular an injection pump for a common rail fuel injection system
  • a pump cylinder with pistons oscillating therein is provided in a housing, the piston being operatively connected on one end face to a controlled drive in order to vary a suction and pressure stroke volume on the other end face, the head region, so that the pressure of the fluid sucked into the pump cylinder from a feed flow inlet is increased by the stroke of the piston in order to make it accessible to a further supply element, in particular a fuel supply or a common rail, by means of a feed valve.
  • a high-pressure pump-piston-cylinder unit for example in the form of an injection pump, is part of the injection system, which furthermore comprises injection lines and injection valves.
  • the injection pump has to perform several tasks, such as delivering the fuel at high pressure, metering the injection quantity, injecting the fuel at the right moment, or according to a specified injection law.
  • a camshaft driven by the engine lifts the injection piston, possibly using a roller tappet.
  • the stroke speed for the 4-stroke engine is half and for the 2-stroke engine the entire crankshaft speed, the injection piston executes a constant stroke.
  • the injection quantity is metered in a known manner by rotating the piston about its longitudinal axis, the delivery quantity and the delivery end are determined by an oblique control edge. As soon as it hits the suction hole, the fuel displaced by the piston flows back into the suction chamber.
  • the pump elements i.e. H. Injection pistons and injection cylinders are manufactured with the greatest accuracy and fit together.
  • the invention relates to an injection pump for a common rail fuel injection system of an internal combustion engine.
  • a control edge described above is no longer required in this system.
  • metering of the fuel supplied to the injection pump takes place, for. B. via an electromagnetically operated metering valve.
  • the metered fuel is then fed to the suction chamber or pump working chamber of the piston pump, in order to then be conveyed at high pressure into a pressure storage line during operation of the internal combustion engine.
  • a check valve is provided at the outlet of the pump work space.
  • a non-return valve is also located at the pump's pump access.
  • Such high-pressure pumps are also used, for example, in a fuel supply system according to DE 101 57 135 A1.
  • the piston in the pump cylinder is deaxed because of small, but ultimately unavoidable, manufacturing tolerances, which has the consequence that the pressure distribution over the piston circumference is not uniform because of gap widths which vary over the piston circumference.
  • the resulting one-sided pressing of the piston in the piston cylinder leads to wear in the contact surface.
  • the object of the present invention is to provide a high-pressure pump-piston-cylinder unit, in particular an injection pump for a common rail fuel injection system of an internal combustion engine, in which the risk of wear of a piston guided in a pump cylinder can be excluded by deaxing.
  • the pump piston has a centering cone formed on it, the maximum half diameter reduction (1/2 x [Dd]) compared to the diameter (D) of the piston shaft of this is in a ratio of approx. 1: 200 and its axial length (I) , ie the height of the truncated centering cone, based on the entire axial length (L) of the piston skirt (including the centering cone) in a ratio (I: L) of approx. 1: 6.6, the pump piston is on its central axis during the pressure stroke centered so that a start on Pump cylinder is prevented.
  • the leakage during pressure build-up is evenly distributed between the pump piston and the pump cylinder, so that the temperature distribution (there is "hydraulic” heat when compressing the fuel) is evenly distributed over the circumference of the pump piston. As a result, the pump piston is not heated on one side and therefore does not deform the effect of temperature.
  • the uniform leakage around the circumference of the pump piston prevents the piston from engaging on one side in the pump cylinder or at least reduces the contact pressure.
  • a further advantage is that the leakage flow is reduced after the piston is centered in the longitudinal direction of the guide surface of the piston, and the hydraulic efficiency of the unit is thus improved.
  • Another advantage is that the fluid in the leak wets the contact surfaces, which results in a lubrication effect, i.e. a lubrication gap is formed on the pump piston due to its stroke movement, which allows the pump piston to float.
  • the single figure shows a view of an injection pump of a common rail injection system, the pump piston of which is designed according to the invention.
  • a piston 2 with a pump cylinder 3 is guided in a cylinder housing 1.
  • the piston is moved in the conveying direction by a camshaft 4 driven by the engine and pushed back by a piston spring 5.
  • the stroke of the piston 2 is invariable, the piston 2 passes through the full stroke with each revolution of the camshaft 4 and carries out a suction and pressure stroke.
  • the pump cylinder 2, ie the suction or working chamber 6, is connected via a high-pressure line 7 to a common rail (not shown) of the fuel injection system.
  • a check valve 8 in the high-pressure line 7 prevents fuel from flowing back from the common rail into the injection pump.
  • the piston 2 sucks fuel through the fuel inlet 9 from the low-pressure chamber into the pump cylinder 3 or working chamber 6 during the suction stroke.
  • a check valve 10 is also provided in the fuel inlet 9 from the low pressure chamber.
  • an electromagnetically actuated metering valve 11 is also arranged in the fuel inlet 9.
  • a centering cone 20 (shown in dashed lines) is formed on the head region of the pump piston 2 and is subject to a clear dimensioning.
  • the centering cone 20 begins in the direction of the camshaft 4 on the first completely circumferential edge of the head region of the pump piston 2 with the smallest diameter d and increases continuously up to the diameter D of the shaft of the piston 2.
  • the centering cone 20 thus forms a straight circular truncated cone, in which the base (diameter D) and top (diameter d) form circular.
  • the taper of the centering cone 20 is thus (1/2 x [Dd]).
  • the ratio of the taper (1/2 x [Dd]) to the piston diameter D must be about 1: 200.
  • the height I of the truncated centering cone 20 is to be dimensioned in relation to the entire piston skirt length L (piston 2 and centering cone 20) (I: L) with approximately 1: 6.6.
  • a centering bevel in the form of a further truncated centering cone 30 is placed on the centering cone 20.
  • the insertion chamfer 30 and the centering cone must be made coaxially with one another with a maximum tolerance of 1 ⁇ m in order to achieve the desired effect of the automatic centering of the piston 2.
  • the centering cone 20, advantageously supported by the insertion cone 30, on the one hand brings about a hydraulic pressure compensation over the circumference of the piston skirt 2 in the piston cylinder 3 and thus prevents the piston 2 from one-sided contact due to the fuel entering the annular space of the leakage under high pressure deaxing.
  • the centering cone can be used on all pressurized pistons to center the piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP05716010A 2004-03-17 2005-03-12 Unite de cylindre a piston plongeur haute pression Active EP1733145B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004012950A DE102004012950A1 (de) 2004-03-17 2004-03-17 Hochdruck-Pumpenkolben-Zylindereinheit
PCT/EP2005/002660 WO2005093249A1 (fr) 2004-03-17 2005-03-12 Unite de cylindre a piston plongeur haute pression

Publications (2)

Publication Number Publication Date
EP1733145A1 true EP1733145A1 (fr) 2006-12-20
EP1733145B1 EP1733145B1 (fr) 2010-10-13

Family

ID=34961611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05716010A Active EP1733145B1 (fr) 2004-03-17 2005-03-12 Unite de cylindre a piston plongeur haute pression

Country Status (8)

Country Link
US (1) US7789635B2 (fr)
EP (1) EP1733145B1 (fr)
JP (1) JP4696106B2 (fr)
KR (1) KR101120709B1 (fr)
CN (1) CN100554679C (fr)
AT (1) ATE484674T1 (fr)
DE (2) DE102004012950A1 (fr)
WO (1) WO2005093249A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102007038539A1 (de) * 2007-08-16 2009-02-19 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102011003452A1 (de) † 2011-02-01 2012-08-02 Robert Bosch Gmbh Kraftstoffeinspritzkomponente
CN102852755A (zh) * 2011-07-28 2013-01-02 南通天华和睿科技创业有限公司 柱塞式加药泵
CN102588239A (zh) * 2012-02-29 2012-07-18 太仓市金鹿电镀有限公司 一种液压泵
CN105298688A (zh) * 2014-06-02 2016-02-03 上海长辛实业有限公司 压力式喷液装置，喷液增压系统及一种增强功率的方法
CN104088769A (zh) * 2014-08-01 2014-10-08 吉首大学 偏心可调式柱塞泵
CN104863907B (zh) * 2015-04-23 2017-10-20 娄方海 两仪蓄能器
FR3057483B1 (fr) * 2016-10-14 2019-04-19 Montabert Appareil a percussions pourvu d’un palier de guidage equipe d’un dispositif de centrage
DE102018211638A1 (de) * 2018-07-12 2020-01-16 Robert Bosch Gmbh Kolbenpumpe, insbesondere Hochdruck-Kraftstoffpumpe für ein Einspritzsystem einer Brennkraftmaschine
CN110925085B (zh) * 2019-11-14 2023-11-14 左臣伟 一体化两冲程燃油发动机
CN113217332A (zh) * 2021-06-10 2021-08-06 福州大学 便携式双缸充气泵及其工作方法

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Also Published As

Publication number Publication date
JP4696106B2 (ja) 2011-06-08
EP1733145B1 (fr) 2010-10-13
KR20060129463A (ko) 2006-12-15
CN100554679C (zh) 2009-10-28
ATE484674T1 (de) 2010-10-15
DE102004012950A1 (de) 2005-10-13
DE502005010385D1 (de) 2010-11-25
JP2007529672A (ja) 2007-10-25
WO2005093249A1 (fr) 2005-10-06
CN1946935A (zh) 2007-04-11
US7789635B2 (en) 2010-09-07
US20080247891A1 (en) 2008-10-09
KR101120709B1 (ko) 2012-03-23

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