EP1537324B1 - Einrichtung zur entlüftung eines förderaggregates - Google Patents

Einrichtung zur entlüftung eines förderaggregates Download PDF

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Publication number
EP1537324B1
EP1537324B1 EP03708025A EP03708025A EP1537324B1 EP 1537324 B1 EP1537324 B1 EP 1537324B1 EP 03708025 A EP03708025 A EP 03708025A EP 03708025 A EP03708025 A EP 03708025A EP 1537324 B1 EP1537324 B1 EP 1537324B1
Authority
EP
European Patent Office
Prior art keywords
conveying assembly
longitudinal bore
housing
assembly according
overflow valve
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.)
Expired - Lifetime
Application number
EP03708025A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1537324A1 (de
Inventor
Armin Merz
Walter Fuchs
Andreas Dutt
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 EP1537324A1 publication Critical patent/EP1537324A1/de
Application granted granted Critical
Publication of EP1537324B1 publication Critical patent/EP1537324B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
    • 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
    • F02M55/007—Venting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7922—Spring biased
    • Y10T137/7927—Ball valves

Definitions

  • a safe bleeding of the delivery unit is to ensure.
  • the venting of a distributor injection pump takes place, for example, during their commissioning.
  • empty fuel tank and air can be sucked into the distributor injection pump, whose escape from the delivery chambers of the distributor injection pump is to ensure, otherwise no fuel can flow.
  • a fuel injection pump in the pump piston on the lateral surface recesses are inserted as connecting cross sections. These extend from the outlet openings of the discharge channel starting on the side of the pump working space.
  • the recesses may be of rectangular contour, which have a different width in the circumferential direction of the pump piston and can also differ in their axial extent, ie their length. With such an arrangement, a kinking cross-sectional profile should be achieved in the course of the opening stroke of the pump piston. This should be increased by the addition of the second connection opening after initially throttled discharge via one of the connection openings of the relief cross section.
  • connection cross-sections proposed here, the throttling action that occurs at different speeds of rotation of the fuel injection pump is lifted in particular.
  • These Ab Kunststofferitese are provided in particular for the adjustment of the fuel injection amount as a function of the speed.
  • one of the connecting cross sections is regularly carried out in the manner of a throttle slot.
  • self-igniting internal combustion engines is in the low load range, especially at idle, the requirement that the fuel is precisely timed, but introduced with a prolonged injection duration in the combustion chamber. This procedure can be particularly useful in the idle range be made noticeable "nails" of the internal combustion engine.
  • About the extended injection duration is achieved that the introduced during the ignition delay amount of fuel is not too large and not too suddenly too much fuel is burned, which would lead to a steep, nick-promoting pressure increase.
  • DE 4032377 A1 discloses a venting device that vents the flow and the pump suction at engine start.
  • DE 36 44 150 A1 has a fuel injection pump for internal combustion engines to the object.
  • This comprises a pump cylinder, which is formed on the one hand reciprocating and at the same time rotates and thereby serves as a distributor of fuel delivered to several injection points supplying pump piston.
  • the pump piston limits a pump working space in the pump cylinder.
  • the fuel injection quantity delivered by the pump piston is varied by varying the opening of an outlet opening on the pump piston circumference of a discharge channel leading from the pump working space to a discharge chamber by means of a ring slide which is axially displaceable on the pump piston by a fuel injection quantity regulator within the discharge space.
  • This has a control edge and at least two different in shape cross-sections, which are in the connection between the outlet opening and the connection made by the control edge on the ring slide in the course of the Pumpenkolben inconveniencehubes connection to the discharge chamber.
  • One of the connecting cross-sections has a throttling, reduced cross section, which occurs in the course of Pumpenkolben ownedhubes first and in front of another, in cross-section larger, non-throttling connection cross-section in connection to the discharge chamber.
  • EP 0 323 984 A1 has the subject of a fuel injection system for internal combustion engines.
  • This comprises a high pressure pump delivering a certain amount of fuel per pump cycle from a pump working chamber with a first control valve arranged in a first discharge channel and controlling a first return flow, in particular the start and end of the fuel injection.
  • a control throttle having a constant cross section and a series-lying electrically controlled second control valve is provided, which is arranged in a second discharge channel for a second return amount.
  • a differential pressure flow meter which has a resilient against a restoring force member, on the one hand from the pump working space side pressure upstream of the control throttle against the restoring force and on the other hand is acted upon by the discharge side pressure downstream of the control throttle. Its deflection is detected by means of a position sensor as a characteristic value of the differential pressure gauge.
  • the electronic control unit in addition to the characteristic values of the differential pressure gauge and the second control valve, the amount of fuel flowing out via the second discharge channel is determined as a control value and the control time of the first control valve is changed according to this control value.
  • an additional bypass bore in the overflow valve on a distributor injection pump can be saved - to give an example - Advantageous embodiments are the subject of the dependent claims.
  • This additional bypass bore on overflow valves represents an additional step in the mass production of overflow valves, which on the one hand requires a renewed clamping of the workpiece in the relevant processing machine and on the other hand has a significant influence on the accuracy of the calibration of the spill valve.
  • the previously formed in overflow valve bypass hole in production technology particularly simple way can advantageously be integrated into the longitudinal bore of the pump housing by an additionally recessed thread cut is introduced in the circular milling of the thread in the housing. This thread cutout is made in one operation with the internal thread in the longitudinal bore into which the spill valve is introduced, wherein the tool descends during the tensioning process a helical path.
  • the thread cut-out is preferably inserted into the longitudinal bore of the housing such that it is spaced a distance, i. an eccentricity, based on the outer edge of the overflow valve runs.
  • the eccentrically formed thread cutout forms a cascade-shaped gap between the inner and outer threads. This gap forms a defined throttle point.
  • the in the longitudinal bore of the pump housing of a distributor injection pump, for example, introduced overflow valve is associated with a ring nozzle, which has a cavity.
  • the cavity of the annular nozzle is connected via a transverse bore on the valve stem with the longitudinal bore of the spill valve in connection.
  • the annular nozzle can be sealed on the valve stem of the overflow valve via two sealing disks, on the one hand in the head region of the overflow valve and on the other hand opposite a plane surface of the pump housing.
  • the outer diameter of the valve stem at the overflow valve and the inner diameter of the two sealing disks are coordinated such that set ventilation gaps, through which an escape of air from the interior of the delivery unit is ensured.
  • the proposed solution according to the invention can also be used for delivery units of hydraulic oil, for example in power steering systems.
  • the proposed solution according to the invention can generally be used in low-pressure inlet and outlet lines, which are fastened with ring nozzles and ensure a bypass throttle function.
  • FIG. 1 the longitudinal section can be removed by an overflow valve integrated into the housing of a distributor injection pump.
  • the housing of a fluid-conveying pump such as a distributor injection pump in direct-injection and air-compression internal combustion engines, is designated by reference numeral 1 and defines an interior 2 of the pump.
  • the interior 2 of the delivery unit is connected via a first bore 3 with a recorded in a longitudinal bore 4 relief valve 7 in connection.
  • the overflow valve 7 can be screwed in via a threaded portion 5 designed as an external thread into a female threaded portion corresponding thereto in the longitudinal bore 4.
  • threaded connection is a higher pressure resistant connection between the spill valve 7 and the housing 1, for example, a distributor injection pump for internal combustion engines, guaranteed.
  • the longitudinal bore 4 in the housing 1 enclosing an annular surface 6 may be formed, in which a made of a soft metallic material ring 15, taking over the function of a first sealing disc, can be admitted.
  • the thus-designed first sealing washer 15 is according to the embodiment in FIG. 1 between a valve stem 14 of the spill valve 7 surrounding annular nozzle 15 and the flat surface 6 of the housing 1 of the delivery unit for sealing admitted.
  • the first sealing disc 15, made of a soft metallic material, opposite a second sealing disc 17 is inserted below a head portion 13 of the spill valve 7, which can also be made of a soft metallic material.
  • the second sealing washer 17 on a flat surface 18 at the head portion 13 of the spill valve 7 and is analogous to the first sealing washer 15 which is received on the flat surface 6 of the housing 1, with an outside of the Ring connection 19 in conjunction.
  • the overflow valve 7 itself comprises a through hole 8, which is in communication with the first bore 3 of the housing 1 of the delivery unit.
  • the through hole 8 is in accordance with the pressure prevailing inside the housing 2 by a ball-shaped closing element 9 closable or releasable.
  • the spherically configured closing element 9 is acted upon by a spiral spring 11, which in turn is supported on an abutment 12 in the head region 13 of the overflow valve 7.
  • the abutment 12 is formed as a shrunken in the head portion 13 of the spill valve 7 ball.
  • an abutment of the ball-shaped closing body 9 acting spring can also be applied by a screwed into the head portion 13 of the spill valve 7 abutment.
  • the ball-shaped closing element 9 closes a valve seat 10, which is formed in the through-bore 8 below a transverse bore 20 passing through the wall of the valve stem 14 of the overflow valve 7.
  • the closing body 9 is driven on reaching a certain pressure limit in the through hole 8 by the pressure against the spring action of the spring 11, so that from the pump inside 2 fuel through the transverse bore 20 of the spill valve 7 in a reference numeral 23 designated cavity of the annular nozzle 19 flow out and can flow back from there into the fuel tank of a motor vehicle, not shown here.
  • a threaded cutout 24 is formed in the female threaded portion 5 of the longitudinal bore 4 of the housing 1. Since the additional thread cutout 24 passes through the threads of the first threaded portion formed in the longitudinal bore 4 and thus forms an air passageway to the outside of the valve stem 14 of the spill valve 7, the center of the additional thread cutout 24 is about said eccentricity 22 to the centerline of the throughbore 8 in FIG Inside the valve stem 14 of the spill valve 7 is moved.
  • the threaded recess 24 is manufactured in one operation with the production of the female threaded portion 5 in the longitudinal bore 4 of the housing 1 of the delivery unit.
  • the circular milling can be considered, in which the additional threaded recess 24 is made in the threads of the first threaded portion 5 of the longitudinal bore 4 in the housing 1 simultaneously with the first internal threaded portion 5 of the longitudinal bore 4.
  • the sealing washers 15 and 17 already described are arranged.
  • the Inner diameter 16 of the first sealing washer 15 is selected such that air can flow through the bore 3 along the air channel formed between the female threaded portion 5 of the longitudinal bore 4 and the additional threaded recess 24 on the outside of the valve stem 14 of the spill valve 7 in the direction of the first sealing disc.
  • a first venting gap 26 is formed, can escape through the air from the pump interior 2.
  • a leakage of fuel is not possible because of the narrow dimensioning of the venting gap 26; In addition, the escape of fuel is prevented by the means of the spring element 11 in his seat 10 Asked closing element 9.
  • the leakage of air from the pump interior 2 of the delivery unit 1 also takes place at a substantially lower pressure level, compared with the Kochdruccm at which the closing element 9 extends against the action of the spring element 11 from its seat 10 at the top of the through hole 8.
  • vent gap 26 which is formed between the circumference of the valve stem 14 of the spill valve 7 and the inner diameter 16 of the first sealing washer 15
  • a further vent gap 27 between the inner diameter of the annular nozzle 19 and the outer diameter of the valve stem 14 of the spill valve 7.
  • This air gap which is sealed due to the bias of the first sealing washer 15 and the second sealing washer 17 to the outside, flows from the interior 2 of the delivery unit 1 escaping air into the cavity 23 of the annular nozzle 19 and from there, for example, in a tank vent or directly into the fuel reservoir of a motor vehicle back.
  • Figure 1.1 is schematically the configuration and the position of the first threaded portion and the additional thread cutout to each other in the longitudinal bore 4 can be removed.
  • the additional thread cutout 24 can be produced simultaneously with the production of the first thread section 5 - which is formed in a larger thread diameter.
  • a calibration of trainees to be formed in a spill valve 7 bypass openings, as was necessary in previous spill valves, can now account for the proposed solution according to the invention, since the bypass opening can be integrated directly into the longitudinal bore 4 of the housing 1 of a delivery unit.
  • FIG. 2 shows the top view of the threaded hole in the housing.
  • FIG. 2 is removed that the overflow valve 7 can be screwed with its first threaded portion 5 in a longitudinal bore 4 of the housing 1.
  • the eccentricity 22, by which the additional thread cutout 24 is offset with respect to the center of the internal thread 5 of the longitudinal bore 4, is in FIG. 2 also identified by reference numeral 22.
  • the eccentricity 22 results from the formation of the additional thread cutout 24 in a smaller thread diameter, compared with the diameter of the internal thread 5 in the longitudinal bore 4 of the housing 1, for example a distributor injection pump for air-compressing internal combustion engines.
  • the proposed inventions venting a Punpeninnenraumes can also be used in hydraulic fluid pumps in motor vehicles, such as a power steering.
  • the inventively proposed solution for venting a pump interior can be used in Kraftstof procedureaggregaten both diesel fuel and gasoline.
  • the venting possibility of a pump housing interior 2 of a delivery unit proposed by the invention allows the incorporation of a ventilation channel functioning as a bypass into the longitudinal bore 4 of the housing 1 by application of the circular milling process.
  • a ventilation channel functioning as a bypass into the longitudinal bore 4 of the housing 1 by application of the circular milling process.
  • the formation of an additional bypass bore in the overflow valve 7, which is screwed into the longitudinal bore 4 on the housing 1 can be avoided.
  • the number of rejects can be reduced in the setting of each installed on the delivery units spill valves 7, since the influence of the bypass hole is now eliminated and this additional processing step in the production of relief valves 7 in mass production now can be omitted.
  • the bypass bore is formed in an advantageous manner in one operation producible additional thread cutout 24 in the female threaded portion 5 of a longitudinal bore 4 on the housing 1 of the respective delivery unit.

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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)
  • Making Paper Articles (AREA)
  • Processing Of Meat And Fish (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
EP03708025A 2002-08-29 2003-02-13 Einrichtung zur entlüftung eines förderaggregates Expired - Lifetime EP1537324B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10239777 2002-08-29
DE2002139777 DE10239777A1 (de) 2002-08-29 2002-08-29 Einrichtung zur Entlüftung eines Förderaggregates
PCT/DE2003/000429 WO2004022967A1 (de) 2002-08-29 2003-02-13 Einrichtung zur entlüftung eines förderaggregates

Publications (2)

Publication Number Publication Date
EP1537324A1 EP1537324A1 (de) 2005-06-08
EP1537324B1 true EP1537324B1 (de) 2009-07-08

Family

ID=31724164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03708025A Expired - Lifetime EP1537324B1 (de) 2002-08-29 2003-02-13 Einrichtung zur entlüftung eines förderaggregates

Country Status (7)

Country Link
US (1) US7029248B2 (ja)
EP (1) EP1537324B1 (ja)
JP (1) JP4309841B2 (ja)
CN (1) CN100436807C (ja)
AT (1) ATE435971T1 (ja)
DE (2) DE10239777A1 (ja)
WO (1) WO2004022967A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020220728A1 (zh) * 2019-04-30 2020-11-05 浙江中马园林机器股份有限公司 一种二冲程汽油机的进油结构

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8899263B2 (en) * 2006-07-24 2014-12-02 Robert Bosch Gmbh Return line connector
CN103122850A (zh) * 2011-11-18 2013-05-29 镇江江大泵业科技有限公司 一种多功能螺塞
DE102012214297A1 (de) 2012-08-10 2014-02-13 Robert Bosch Gmbh Überströmventil, insbesondere eines Kraftstoffeinspritzsystems einer Brennkraftmaschine
GB201415141D0 (en) * 2014-08-27 2014-10-08 Delphi International Operations Luxembourg S.�.R.L. An evacuation assembly and arrangement
CN104343507B (zh) * 2014-10-29 2017-07-14 凯龙高科技股份有限公司 一种液力驱动式喷射装置
CN104500294A (zh) * 2014-12-29 2015-04-08 江铃汽车股份有限公司 一种高压油泵的排气结构
CN107762698B (zh) * 2017-10-27 2019-08-30 广西玉柴机器股份有限公司 喷油泵的溢油阀
DE102018202128A1 (de) * 2018-02-12 2019-08-14 Te Connectivity Germany Gmbh Elektrische Verbindungseinheit und Batteriesystem
DE102019204754A1 (de) * 2019-04-03 2020-10-08 Robert Bosch Gmbh Ventilbaugruppe

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GB1022162A (en) * 1962-05-26 1966-03-09 Cav Ltd Liquid fuel pumps for internal combustion engines
DE2356399A1 (de) * 1973-11-12 1975-05-15 Hatz Motoren Einspritzbrennkraftmaschine
DE2522374A1 (de) * 1975-05-21 1976-12-02 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
DE2606185A1 (de) * 1976-02-17 1977-08-18 Farymann Diesel Einrichtung zur brennstoffzufuhr von einem brennstoffbehaelter zu dem saugraum einer tiefer als der brennstoffbehaelter liegenden einspritzpumpe einer brennkraftmaschine
US4210117A (en) * 1976-06-28 1980-07-01 Holec N.V. Device for supplying fuel to a combustion engine and method of _manufacturing said device
DE2742028A1 (de) * 1977-09-17 1979-03-29 Farymann Diesel Einrichtung zur brennstoffzufuhr zum saugraum der einspritzpumpe einer brennkraftmaschine
US4142499A (en) * 1977-09-30 1979-03-06 Stanadyne, Inc. Temperature compensated fuel injection pump
US4309151A (en) * 1979-05-03 1982-01-05 Lucas Industries Limited Liquid fuel injection pumping apparatus
DE3127543A1 (de) * 1981-07-11 1983-01-20 Robert Bosch Gmbh, 7000 Stuttgart "kraftstoffversorgungseinrichtung fuer brennkraftmaschinen"
DE3644150C2 (de) * 1986-12-23 1995-11-23 Bosch Gmbh Robert Kraftstoffeinspritzpumpe für Brennkraftmaschinen
DE3722264A1 (de) * 1987-07-06 1989-01-19 Bosch Gmbh Robert Kraftstoffeinspritzanlage fuer brennkraftmaschinen
DE4032377A1 (de) * 1990-10-12 1992-04-16 Daimler Benz Ag Kraftstoffversorgungseinrichtung mit einer entlueftungsvorrichtung fuer eine luftverdichtende brennkraftmaschine
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020220728A1 (zh) * 2019-04-30 2020-11-05 浙江中马园林机器股份有限公司 一种二冲程汽油机的进油结构

Also Published As

Publication number Publication date
CN100436807C (zh) 2008-11-26
ATE435971T1 (de) 2009-07-15
US7029248B2 (en) 2006-04-18
EP1537324A1 (de) 2005-06-08
US20050031472A1 (en) 2005-02-10
DE50311688D1 (de) 2009-08-20
CN1553992A (zh) 2004-12-08
DE10239777A1 (de) 2004-03-18
JP2005537426A (ja) 2005-12-08
WO2004022967A1 (de) 2004-03-18
JP4309841B2 (ja) 2009-08-05

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