EP2385241B1 - Schwingungsdämpfer - Google Patents

Schwingungsdämpfer Download PDF

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Publication number
EP2385241B1
EP2385241B1 EP20100004708 EP10004708A EP2385241B1 EP 2385241 B1 EP2385241 B1 EP 2385241B1 EP 20100004708 EP20100004708 EP 20100004708 EP 10004708 A EP10004708 A EP 10004708A EP 2385241 B1 EP2385241 B1 EP 2385241B1
Authority
EP
European Patent Office
Prior art keywords
damping element
pulsation damper
damping
fuel
connector
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
EP20100004708
Other languages
English (en)
French (fr)
Other versions
EP2385241A1 (de
Inventor
Gianbattista Fischetti
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP20100004708 priority Critical patent/EP2385241B1/de
Publication of EP2385241A1 publication Critical patent/EP2385241A1/de
Application granted granted Critical
Publication of EP2385241B1 publication Critical patent/EP2385241B1/de
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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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 invention relates to a pulsation damper.
  • the invention relates to a pulsation damper for a high-pressure pump like a fuel pump for conveying fuel in a fuel system of a motor vehicle.
  • high-pressure pumps for a high-pressure fuel supply in internal combustion engines of motor vehicles. These kind of high-pressure pumps are particularly applicable for supplying gasoline fuel at Common Rail Systems. With this regard, the fuel supplied is compressed up to a pressure of 150 to 200 bar.
  • High-pressure pumps usually comprise a housing in which a compressing unit with a cylinder for high-pressure compression is arranged. Within the housing, channels are provided serving as a feed line for the fuel being conveyed from the fuel tank via the compressing unit to the cylinder of the internal combustion engine. Often, due to the working principle of conventional displacement pumps, these compressors cause pressure or stream pulsations. Additionally, the fuel generally reaches the high-pressure pump with pulsations, e.g. caused by a backing pump. In order to reduce such pulsations, fuel systems, or high-pressure pumps, respectively, may comprise pulsation dampers.
  • Conventional pulsation dampers use a spring-biased or flexible damping element which damps pulsation by an axial movement, or displacement, respectively.
  • the major drawback of such kinds of pulsation dampers is the requirement of forming them big-sized to allow an adequate flowrate. Furthermore, no adjustment is possible for an adaption to vary performance conditions.
  • EP-A- 1 944 512 discloses a pulsation dumper, for a high-pressure fuel pump of a motor vehicle, comprising a damper housing, and at least one first bended damping element being formed as a hollow capsule having an internal volume.
  • the document EP-A- 1 150 003 discloses a fuel rail assembly.
  • the fuel rail assembly includes a generally hollow fuel rail having a longitudinal rail axis extending there-through and a fuel damper element having a wall and a longitudinal damper element axis extending therethrough.
  • the fuel damper element is located within the fuel rail.
  • the damper axis is generally parallel with the rail axis.
  • the document DE-A- 10 2006 027 780 discloses a fuel injector for injecting fuel into a combustion chamber, having a solenoid valve for controlling a mini-servo valve.
  • a movable armature can be placed in a sealing fashion on a valve seat in a lower armature chamber, wherein in addition the mini-servo valve is held in an injector body and seals a control line against a flat seat.
  • the control line can be relieved of pressure from a high fuel pressure to a return pressure into at least one return line.
  • a mechanism for reducing pressure oscillations are provided in the at least one return line, which includes at least one diaphragm cell which is held in a recess and which is placed in fluidic connection with the at least one return bore.
  • a fuel injector with the mechanism for reducing pressure oscillations is therefore created in the at least one return line which operates without a leakage flow and has a simple and effective function.
  • the pulsation damper in particular pulsation damper for a high-pressure fuel pump of a motor vehicle, according to the invention comprises a damper housing, and at least one first flexible bended damping element being formed as a hollow capsule having an internal volume.
  • the pulsation damper according to the invention takes advantage of the special geometry of a bended damping element. Due to its bended form, there are different surface areas at the internal side and at the external side of the bended element on which the pressure may act. In other words, the damping properties are caused by the difference of wetted length between the internal surface and the external surface. Due to its flexibility, the damping element may be deformed by the pressure of the conveyed fluid, in particular by the conveyed fuel. It thus transforms the pressure pulsation in a bent. The damping element may therefore act as an elastic receptacle for the volume stream pulsation, or pressure pulsations. A consumer may therefore be supplied with a continuous stream the pressure level of which has negligible fluctuations or no fluctuations at all.
  • the pulsation damper according to the invention may handle a bigger volume stream compared to conventional pulsation dampers. This may be realized even by forming it in a compact size. Therefore, it is especially suitable for inserting it into systems with small-sizes requirements.
  • the at least one damping element is connected to the damper housing by a connector, wherein the connector has an internal volume being in fluid communication with the internal volume of the damping element and with a gas connection.
  • the connector has an internal volume being in fluid communication with the internal volume of the damping element and with a gas connection.
  • the damping element is connected to the connector at one connection point. This allows suitable deformation properties, or bending properties, respectively, of the damping element.
  • the damping element is filled with gas.
  • the volumetric stiffness of the damping element is thereby given by the gas pressure inside said damping element. This enables to take influence on the damping properties by providing a defined gas pressure inside the damping element, or the inner volume, respectively.
  • the gas is air. This is the most simple way of forming the damping element.
  • the damping element is formed of a metal, in particular of stainless steel. This is a very beneficial material for providing the desired damping properties.
  • the damping element comprises an external partial ring and an internal partial ring. Due to the fact that the damping properties are caused by bending said damping element which in turn is strongly dependent of the properties of the internal surface and the external surface of the damping element, this is a further beneficial way to adjust the damping properties.
  • the external partial ring and the internal partial ring are formed of dissimilar materials.
  • This effect may furthermore be reached if the external partial ring and the internal partial ring are formed in different thicknesses. This may be advantageous if the external partial ring and the internal partial ring are formed of the same material, in particular stainless steel, or are formed of dissimilar materials.
  • a second separate bended damping element is provided being arranged on the damper housing, together with the first damping element, in a substantially circular shape and being connected to the damper housing by the connector, wherein the second damping element is formed as a hollow capsule having an internal volume, the latter being in fluid communication with the internal volume of the connector.
  • This embodiment allows providing an improved damping capacity.
  • substantially circular shape shall refer to an arrangement having the shape or nearly the shape of a circle, e.g. in the form of an ellipse, oval, etc.
  • a substantially circular shape according the invention implies that the latter is interrupted in that the damping elements are separated from each other to allow an adequate deformation, or bending, respectively.
  • the invention further relates to a pump, in particular high-pressure fuel pump for a motor vehicle, comprising a pulsation damper according to the invention.
  • a pump 10 is shown.
  • This pump 10 preferably is a high-pressure pump of a fuel system of a motor vehicle. Consequently, this pump 10 may mainly be used for conveying fuel, in particular diesel fuel in common rail systems, at high pressures. In detail, pressures up to 2 500 bar may be reached.
  • the pump 10 is not strictly limited to this application.
  • the pump 10 comprises a housing 12, which comprises or is connected to a cylinder 14.
  • the cylinder 14 serves for high-pressure compression of fluids, in particular for high-pressure compression of diesel fuel.
  • the cylinder 14 has an inner surface 16 which abuts the housing 12.
  • the cylinder 14 comprises a cylinder bore 18 and a compression chamber 20, in which fed fuel is compressed to be conveyed, after the compression, at least partly to a common rail system for fuel injection.
  • a moveable piston 22 is arranged in the cylinder bore 18.
  • the piston 22 may be connected to an excenter.
  • the volume of the compression chamber 20 may be changed. For example, by decreasing the volume of the compression chamber 20, fuel being located in the latter may be compressed.
  • Fuel is guided through a conduct 24 into the compression chamber 20 and leaves the pump 10 through an outlet 26.
  • a pulsation damper 28 is provided upstream and/or downstream the compression chamber 20, a pulsation damper 28 is provided.
  • the pulsation damper 28 has as object to damp pulsations and thus to generate a continuous flow of fuel.
  • the subsequent description is directed towards a pulsation damper 28 being located upstream the compression chamber 20.
  • the pulsation damper 28 as well as the pump 10 according to the invention is not limited to this embodiment.
  • the pump 10 may comprise an enclosure 30 in which the pulsation damper 28 is arranged.
  • the enclosure 30 comprises a joint 32 for guiding the fuel from the enclosure 30 through the conduct 24 into the compression chamber 20.
  • the pump 10 furthermore comprises an inlet 34 for guiding the fuel into the enclosure 30 and thus to the pulsation damper 28.
  • the inlet 34 is shown in figure 2 .
  • the inlet 34 is arranged on top of the enclosure 30.
  • the enclosure 30 thus forms a closed cavity for an arrangement of the pulsation damper 28.
  • the pulsation damper 28 is shown in detail in figure 3 .
  • the pulsation damper 28 comprises a damper housing 36.
  • the damper housing 36 may have a circular form and may be formed of metal.
  • An especially preferable metal for forming the damper housing 36 is stainless steel.
  • the damper housing 36 may be fixed in the enclosure 36 to hold the pulsation damper 28 in place. Consequently, it is advantageous that the damper housing 36 has the same shape as the enclosure 30.
  • a connector 38 is preferably connected to the damper housing 36.
  • the connector 38 may be formed hollow as it is described in detail with respect to figure 5 .
  • the connector 38 has as one objective to serve as an interface between the damper housing 36 and a bended damper element 40.
  • one bended damping element 40 may be sufficient.
  • the single damping element 40 may have a semicircular or nearly circular form.
  • the present invention will be described in an embodiment comprising two damping elements 40. Consequently, it is possible to provide at least one damping element 40, preferably two damping elements 40 and in some embodiments more than two damping elements 40 without leaving the invention as such. This implies that all features of the damping elements 40 described with regard to an embodiment comprising two damping elements 40 are as well applicable for an embodiment comprising one damping element 40.
  • the damping elements 40 are shaped in a bended form.
  • each of the damping elements 40 substantially has a semicircular shape. Consequently, the damping elements 40 together substantially form a circle. It is, however, essential, that the damping elements 40 are separated from each other to provide a sufficient movability like described down below.
  • the connector 38 may be located between the damping elements 40.
  • the connector 38 may form a connection between the damping elements 40 and the damper housing 36 for holding the damping elements 40 in place. It is, however, preferred, that the damping elements 40 are connected to the connector 38 at one connection point. This enables the damping elements 40 to be suspended freely and allows a free movability of the damping elements 40 and thus good bending properties.
  • the pulsation damper 28 will then work as follows.
  • the pulsation damper 28 is arranged in the fuel system of a motor vehicle, in particular in the high-pressure fuel pump, fuel is guided into the enclosure 30. Consequently, fuel will contact the pulsation damper 28 and particularly the damping elements 40 with an increased pressure. Furthermore, the fuel will enter the enclosure 30 with pulsations. That means that the fuel flows in a discontinuous manner, i.e. the fuel forms a flow with pressure and/or volume pulsations.
  • the damping elements 40 have an internal surface 42 and an external surface 44.
  • the fuel flow will then exert pressure to both the internal surface 42 and the external surface 44 of the damping elements 40. Due to the bended shape, the pressure interacting on the damping elements 40 will cause a deformation of the latter, thereby transforming the pressure in a bent.
  • the stiffness of the damping elements 40 will force them back into their initial shape when the pressure has a lower value caused by the pressure pulsations. This mechanism allows to damp pulsations and thus to generate a nearly or completely continuous flow of fuel.
  • the damping elements 40 are formed as hollow capsules. It is advantageous that the damping elements are formed of a metal, in particular of stainless steel. In one embodiment, the damping elements 40 may be formed as bent pipes. This is shown in figure 4 .
  • the damping elements 40 have an inner volume 46 which may be filled with any kind of gas. However, air is most preferred, as this is the simplest way to fill the damping elements 40 or the inner volume 46, respectively. Even though the damping elements 40 are formed as capsules, i.e. an air exchange is not possible directly between the inner volume 46 of the damping elements 40 and the surrounding atmosphere, the inner volume 46 of the damping elements 40 is connected to an inner volume 48 of the connector 38.
  • the fluid communication of the inner volume 46 of the damping elements 40 and the inner volume 48 of the connector 38 is shown.
  • the inner volume 46 and the inner volume 48 form a gas chamber which may be filled with gas to create a desired pressure inside that gas chamber.
  • the connector 38 comprises a gas connection 50, which connects the inner volume 48 of the connector 38 and thus the inner volume 46 of the damping elements 40 to the outer atmosphere.
  • a plug 52 may be provided to close the gas connection 50. It has to be noted that apart from a plug, there are several closing elements known in the art which may be applicable to close the gas connection 50.
  • the stiffness, or the flexibility, respectively of the damping elements 40 and thus the ability to damp pressure pulsations is thereby dependent from the gas and the gas pressure pressure inside the damping elements 40. Therefore, by varying the gas and/or the gas pressure inside the damping elements 40, the damping properties may be varied according to the current requirements.
  • the damping elements 40 comprise an inner or internal partial ring 54 and an outer or external partial ring 56.
  • the internal partial ring 54 and the external partial ring 56 may be formed of different materials. With this regard, the materials may be chosen to create the desired damping properties. Furthermore, the damping properties may be adjusted by forming the internal partial ring 54 and the external partial ring 56 with different thicknesses.
  • the damping properties are adjusted to a required amount by using a combination of the above described measures.
  • the damping elements 40 may be formed of different materials.
  • the inner volume 48 of the connector 38 may be divided into two parts, each of the parts having one gas connection and being connected to one of the damping elements 40. This allows providing different gas pressures in each of the damping elements 40 and thus adjusting the damping properties independent from each other.

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

Claims (9)

  1. Schwingungsdämpfer, insbesondere Schwingungsdämpfer für eine Hochdruck-Kraftstoffpumpe eines Motorfahrzeugs, umfassend
    ein Dämpfergehäuse (36), und
    mindestens ein flexibles, gebogenes Dämpfungselement (40), ausgebildet als eine hohle Kapsel mit einem inneren Volumen (46) und dadurch gekennzeichnet, dass das mindestens eine Dämpfungselement (40) durch ein Verbindungsstück (38) mit dem Dämpfergehäuse (36) verbunden ist, wobei das Verbindungsstück (38) ein inneres Volumen (48) hat, das in Fluidkommunikation mit dem inneren Volumen (46) des Dämpfungselementes (40) und mit einer Gasverbindung (50) steht.
  2. Schwingungsdämpfer gemäß Anspruch 1, dadurch gekennzeichnet dass das Dämpfungselement (40) mit Gas gefüllt ist.
  3. Schwingungsdämpfer gemäß Anspruch 1, dadurch gekennzeichnet dass das Dämpfungselement (40) an einem Verbindungspunkt mit dem Verbindungsstück (38) verbunden ist.
  4. Schwingungsdämpfer gemäß irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet dass das Dämpfungselement (40) aus einem Metall erzeugt ist, insbesondere aus rostfreiem Stahl.
  5. Schwingungsdämpfer gemäß irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet dass das Dämpfungselement (40) einen äußeren teilweisen Ring (56) und einen inneren teilweisen Ring (54) umfasst.
  6. Schwingungsdämpfer gemäß Anspruch 4, dadurch gekennzeichnet dass der äußere teilweise Ring (56) und der innere teilweise Ring (54) aus unterschiedlichen Materialien erzeugt sind.
  7. Schwingungsdämpfer gemäß Anspruch 5 oder 6, dadurch gekennzeichnet dass der äußere teilweise Ring (56) und der innere teilweise Ring (54) in unterschiedlichen Dicken ausgebildet sind.
  8. Schwingungsdämpfer gemäß irgendeinem der Ansprüche 3 bis 7, dadurch gekennzeichnet dass ein zweites, separates gebogenes Dämpfungselement (40) bereitgestellt ist, das zusammen mit dem ersten Dämpfungselement (40) in einer im wesentlichen kreisförmigen Gestalt an dem Dämpfergehäuse (36) angeordnet ist und mittels des Verbindungsstücks (38) mit dem Dämpfergehäuse (36) verbunden ist, wobei das zweite Dämpfungselement (40) als eine hohle Kapsel mit einem inneren Volumen (46) ausgebildet ist, wobei die letztere in Fluidkommunikation mit dem inneren Volumen (48) des Verbindungsstückes (38) steht.
  9. Pumpe, insbesondere Hochdruck-Kraftstoffpumpe für ein Motorfahrzeug, umfassend einen Schwingungsdämpfer (28) gemäß irgendeinem der vorhergehenden Ansprüche.
EP20100004708 2010-05-04 2010-05-04 Schwingungsdämpfer Not-in-force EP2385241B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20100004708 EP2385241B1 (de) 2010-05-04 2010-05-04 Schwingungsdämpfer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20100004708 EP2385241B1 (de) 2010-05-04 2010-05-04 Schwingungsdämpfer

Publications (2)

Publication Number Publication Date
EP2385241A1 EP2385241A1 (de) 2011-11-09
EP2385241B1 true EP2385241B1 (de) 2013-07-17

Family

ID=42732170

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100004708 Not-in-force EP2385241B1 (de) 2010-05-04 2010-05-04 Schwingungsdämpfer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD763321S1 (en) 2015-02-26 2016-08-09 Eaton Corporation Pulse damper

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10443595B2 (en) 2015-04-20 2019-10-15 Hitachi, Ltd. Automotive fuel pump
DE102015219772A1 (de) * 2015-10-13 2016-10-06 Continental Automotive Gmbh Niederdruckdämpfer sowie Kraftstoffhochdruckpumpe
DE102019212008A1 (de) * 2019-08-09 2021-02-11 Robert Bosch Gmbh Kraftstoff-Hochdruckpumpe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5562429A (en) * 1989-09-28 1996-10-08 Caro Manufacturing Corporation Pulse dampener and fuel pump having same
US5253995A (en) * 1989-09-28 1993-10-19 Caro Manufacturing Corporation Apparatus for making a pulse dampener
US5035588A (en) * 1990-06-06 1991-07-30 Walbro Corporation Rotary fuel pump with pulse modulation
US6314942B1 (en) * 2000-04-25 2001-11-13 Siemens Automotive Corporation Fuel pressure dampening element
DE102006027780A1 (de) * 2006-06-16 2007-12-20 Robert Bosch Gmbh Kraftstoffinjektor
DE102007001485A1 (de) * 2007-01-10 2008-07-17 Zf Lenksysteme Gmbh Verdrängerpumpe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD763321S1 (en) 2015-02-26 2016-08-09 Eaton Corporation Pulse damper
USD797155S1 (en) 2015-02-26 2017-09-12 Eaton Corporation Pulse damper

Also Published As

Publication number Publication date
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