EP3039280A1 - Soupape de décharge pour système d'injection de carburant ainsi que système d'injection de carburant - Google Patents

Soupape de décharge pour système d'injection de carburant ainsi que système d'injection de carburant

Info

Publication number
EP3039280A1
EP3039280A1 EP14753242.8A EP14753242A EP3039280A1 EP 3039280 A1 EP3039280 A1 EP 3039280A1 EP 14753242 A EP14753242 A EP 14753242A EP 3039280 A1 EP3039280 A1 EP 3039280A1
Authority
EP
European Patent Office
Prior art keywords
valve
spring
spring chamber
injection system
pressure
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Withdrawn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
EP14753242.8A
Other languages
German (de)
English (en)
Inventor
Stefan Kieferle
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 EP3039280A1 publication Critical patent/EP3039280A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs

Definitions

  • the invention relates to an overflow valve for a fuel injection system, in particular a common rail injection system, with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injection system with such a valve for pressure control and / or pressure limiting.
  • Overflow valves of the aforementioned type are usually used in a low-pressure region, in particular in an inlet region of a high-pressure fuel pump of a fuel injection system. They serve to return an excess amount of fuel in the low pressure region and thus allow a pressure control and / or pressure limiting.
  • an overflow valve for a fuel injection system emerges by way of example. It comprises a valve housing having an inlet and an outlet, a piston-shaped valve element displaceably guided axially in the valve housing, via the axial displacement of which the inlet and the outlet can be connected, and a spring element received in a spring chamber of the valve housing.
  • the spring element is supported on the one hand on the valve element and on the other hand on an adjusting element which is inserted into the valve housing. The adjusting element serves to adjust the spring preload and thus the opening pressure of the overflow valve.
  • the adjusting element has a vent bore with a throttle arranged therein for ventilating the spring chamber.
  • the spring-loaded valve element of such a relief valve is in equilibrium of forces between the one hand applied spring force and the other applied hydraulic pressure force, which results from the hydraulic active surface of the valve element and a differential pressure acting thereon.
  • the result of the differential pressure is that the spring chamber is filled with fuel by means of the leakage. Without hydraulic connection of the spring chamber to the low-pressure region via a venting or relief bore, the spring chamber would be filled so strongly over time that opening the valve would be impossible.
  • the venting or relief bore therefore ensures the operability of the valve.
  • the drain is usually throttled via the venting or relief bore. The damping effect prevents or limits overshoot of the valve element at high pressure pulsations and also allows, at least in part, the compensation of a
  • Displacer volume for volumetrically unbalanced high-pressure pumps, for example in single-punch high-pressure pumps.
  • the fuel is vaporized in the spring chamber at high speeds over the largest possible rotation angle range of the high-pressure pump.
  • the spring chamber of the overflow valve is additionally filled, so that the danger of overfilling of the spring chamber and a concomitant "stiffening" of the valve exists.
  • the present invention is therefore based on the object of specifying an overflow valve for a fuel injection system, which enables dynamic volume compensation even at high speeds of rotation of a connected high-pressure pump, in order to reduce the pulsation effect of the high-pressure pump to the low-pressure region.
  • the proposed overflow valve comprises a valve housing having an inlet and at least one outlet, a valve element accommodated in the axially displaceably guided valve element, via its axial displacement against the spring force of a spring, the input and the output are connectable, wherein the spring is received in a spring chamber of the valve housing.
  • the spring chamber is connected via a discharge hole to a low pressure region of the fuel injection system.
  • means are provided for preventing overfilling of the spring chamber, wherein the means comprise a formed in the guide region of the valve element, connected to the output or connectable annular groove and / or a check valve, via which the spring chamber with the low pressure region is connectable.
  • the proposed means for avoiding overfilling of the spring chamber serve in particular to reduce a quantity of leakage entering the spring chamber and / or to reduce a quantity of steam present or produced in the spring chamber.
  • annular groove connected or connectable with the outlet is preferably provided in the guide region of the valve element.
  • the guide region of the valve element is defined by a guide section on the axially displaceable valve element and a guide section on the valve housing.
  • the existing in the guide area between the valve element and the valve housing guide gap also forms a leakage path, passes through the fuel into the spring chamber. Due to the formation of the annular groove in the guide region of the valve element, d. H. in the
  • Leakage path at least a portion of the effluent via the leakage path leakage amount - at a compound of the annular groove with the at least one output - are discharged via the output.
  • the reaching over the guide area in the spring chamber leakage amount is thereby effectively reduced and prevents overfilling of the spring chamber.
  • a check valve This is preferably arranged in the connection region of the spring chamber to the low-pressure region.
  • the check valve should reduce in this way a filling of the spring chamber via the connection area, which can form a further path, passes through the fuel in the spring chamber.
  • the proposed overflow valve is therefore able to compensate the displacement volume of the high-pressure pump to such an extent that the load on the low-pressure region is significantly reduced due to pressure pulsations.
  • the annular groove formed in the guide region of the valve element is formed on the inner circumference side on the valve housing or on the outer peripheral side on the valve element. If the annular groove is formed on the outer circumference of the valve element, it is preferably arranged such that it can be connected to the at least one output via an axial displacement of the valve element.
  • the annular groove Upon a connection of the annular groove with the outlet, the annular groove causes a lowering of the pressure to the return pressure level over the circumference of the valve element.
  • the pressure gradient in the region between the annular groove and the spring chamber is minimized and consequently the leakage in the direction of the spring chamber. Because at least a portion of the leakage quantity is supplied via the annular groove to the output or the outputs.
  • the arrangement on the valve element is selected such that the annular groove is in the normal position of the valve element in connection with the at least one output.
  • the output is for this purpose preferably designed as a radial bore. In the normal position of the valve element thus an optimal effect of the annular groove is ensured.
  • the annular groove on the inner circumference side formed on the valve housing and thus is independent of an axial change in position of the axially displaceable valve element it is preferably arranged on a spring chamber facing the end of the at least one output of the valve housing.
  • the output is again preferably designed as a radial bore.
  • the alternatively or additionally provided to avoid overfilling of the spring chamber check valve, via which the spring chamber with the Nie derdruck Scheme connectable, is preferably designed such that it on the one hand prevents backflow of fuel into the spring chamber or at least made difficult, on the other hand allows the outflow of fuel from the spring chamber to ensure the required relief of the spring chamber. Because the connection of the spring chamber to the low pressure region to relieve the spring chamber is realized in this case via the discharge hole. In the arrangement of the check valve in the region of the connection to the low-pressure region must therefore continue to be guaranteed the required relief on the relief hole.
  • the check valve is located downstream of a throttle formed in the relief bore.
  • the throttle causes a delay of the fuel discharge from the spring chamber, so that there is always a certain amount of fuel in the spring chamber, via which a broke- tion effect can be achieved.
  • the check valve is designed as a flap spring.
  • the flap spring is a spring ring with at least one hinged flap which releases the relief bore as a function of the prevailing pressure conditions or at least partially obstructs it.
  • a spring washer is not only simple and inexpensive to manufacture, but also easy to assemble.
  • the spring ring at the height of the discharge hole on the outer circumference side are pushed onto the valve housing.
  • an annular groove can be formed on the outer circumference side in the valve housing at the level of the relief bore into which the spring ring is inserted.
  • the relief hole can be sized larger.
  • an overflow valve according to the invention comes into play in particular when the valve is used in a fuel injection system. Therefore, a fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine with an overflow valve according to the invention for pressure regulation and / or pressure limitation is also proposed.
  • the fuel injection system is preferably a common rail injection system comprising a high pressure pump for delivering fuel to high pressure.
  • the overflow valve is preferably inserted into a housing bore of the high-pressure pump, in particular screwed in or pressed in, so that inlet pressure is applied to the valve element of the valve.
  • the overflow valve may be arranged as a separate component near the high-pressure pump.
  • FIG. 1 shows a longitudinal section through an inventive overflow valve according to a first preferred embodiment
  • FIG. 3 shows a longitudinal section through an inventive overflow valve according to a third preferred embodiment
  • Fig. 4 is an enlarged section of Fig. 3 in the region of the relief bore and
  • Fig. 5 is a perspective view of a flap spring. Detailed description of the drawings
  • FIGS. 1 to 3 show preferred embodiments of an overflow valve according to the invention.
  • Each of these overflow valves comprises a cylinder-shaped valve housing 1, into which an axially displaceable, piston-shaped valve body 1
  • Valve element 4 is received such that it is guided axially over a guide region of the valve housing 1.
  • the valve housing 1 forms an end face of an input 2, which is connectable to an inlet region of a high-pressure pump, not shown.
  • the valve housing 1 has radial bores serving as outputs 3 with circular or any other desired
  • the spring 5 is received in a spring chamber 6, which is connected via at least one relief bore 7 to the low-pressure region 8. Due to a pressure gradient between inlet pressure and the pressure in the low-pressure region 8, the spring chamber 6 is filled with fuel by way of the leakage past the valve element 4.
  • the relief bore 7 ensures that the fuel passing through the spring chamber 6 by means of the leakage is led back into the low-pressure region 8 and can continue to open the overflow valve for regulating and / or limiting the inlet pressure.
  • the return of the fuel into the low-pressure region 8 is throttled.
  • a throttle 12 is formed for this purpose.
  • the throttle 12 can not prevent that under dynamic, ie non-stationary boundary conditions, while negative pressure prevails in the spring chamber 6, fuel passes from the low-pressure region 8 back into the spring chamber 6.
  • the spring chamber 6 is on the one hand with fuel via the relief hole 7 and on the other hand by way of leakage at the Ventilele- ment 4 filled with fuel, so that the risk of overfilling of the spring chamber 6 is.
  • the overflow valves according to the invention shown in Figures 1 to 3 therefore each have means 9 to avoid overfilling the spring chamber 6 with fuel.
  • the means 9 for preventing overfilling of the spring chamber 6 comprise an annular groove 10 integrated into the valve housing 1 of the overflow valve.
  • the annular groove 10 is arranged on the inner circumference in the mouth region of the radial bores serving as outlets 3, so that they are in connection with the outputs 3 and the outputs 3 in
  • the means 9 for avoiding overfilling of the spring chamber 6 comprise an annular groove 10 'which, in contrast to the embodiment of FIG. 1, is not integrated in the valve body 1 but in the valve element 4.
  • the arrangement of the annular groove 10 ' takes place on the outer circumference of the valve element 4, wherein the axial position of the annular groove 10' is selected such that it is connected to the outputs 3 in the normal position of the valve element 4 (as shown in FIG.
  • the operation of the annular groove 10 'thus corresponds largely to the operation of the annular groove 10 of the embodiment of Figure 1, so that reference is made thereto.
  • the annular grooves 10 and 10 ' reduce the amount of leakage reaching the spring chamber 6 and thus prevent overfilling of the spring chamber 6.
  • a non-return valve 11 designed as a flap valve, which prevents fuel from the low-pressure region 8 from falling back into the
  • the flap spring has at least one flap 13, which is articulated such that it releases the relief bore 7 when pressure is applied in the direction of relief, but blocks the relief bore 7 in the opposite direction.
  • the number of flaps 13 is to be selected according to the number of relief holes 7.
  • a relief hole 7 of the embodiment of Figure 3 is shown enlarged.
  • Serving as a relief hole 7 radial bore is designed as a stepped bore, the area of reduced diameter serves as a throttle 12.
  • the relief hole 7 opens into an annular groove 14, which is formed on the outer peripheral side in the valve body 1 for receiving the flap spring.
  • the design of the flap spring is shown in FIG 5.
  • the means 9 shown in Figures 1 to 5 to avoid overfilling of the spring chamber 6 can be used individually or in combination.
  • the check valve 11 illustrated in FIGS. 3 to 5 can be used not only in combination with an annular groove 10 '(as shown in FIG. 3), but also in combination with an annular groove 10.

Landscapes

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

Abstract

L'invention concerne une soupape de décharge, destinée à un système d'injection de carburant, notamment un système d'injection à rampe de distribution commune, qui comprend un boîtier de soupape (1) muni d'une entrée (2) et d'au moins une sortie (3), un élément de soupape (4), logé dans le boîtier de soupape (1) et guidé en coulissement axial, dont le coulissement axial contre la force d'un ressort (5) permet de relier l'entrée (2) et la sortie (3). Le ressort (5) est logé dans un logement de ressort (6) du boîtier de soupape (1), lequel peut être raccordé à une zone de basse pression (8) du système d'injection de carburant par le biais d'un orifice de décharge. Selon l'invention, la soupape comprend des moyens (9) destinés à empêcher un remplissage excessif du logement de ressort (6). Les moyens (9) comprennent une rainure annulaire (10, 10') formée dans la zone de guidage de l'élément de soupape (4) et reliée ou pouvant être reliée à la sortie (3) et/ou un clapet antiretour (11) par le biais duquel à le logement de ressort (6) peut être relié à la zone à basse pression (8). L'invention concerne en outre un système d'injection de carburant équipé d'une telle soupape de décharge.
EP14753242.8A 2013-08-26 2014-08-19 Soupape de décharge pour système d'injection de carburant ainsi que système d'injection de carburant Withdrawn EP3039280A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013216889.6A DE102013216889B4 (de) 2013-08-26 2013-08-26 Überströmventil für ein Kraftstoffeinspritzsystem sowie Kraftstoffeinspritzsystem
PCT/EP2014/067644 WO2015028353A1 (fr) 2013-08-26 2014-08-19 Soupape de décharge pour système d'injection de carburant ainsi que système d'injection de carburant

Publications (1)

Publication Number Publication Date
EP3039280A1 true EP3039280A1 (fr) 2016-07-06

Family

ID=51390108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14753242.8A Withdrawn EP3039280A1 (fr) 2013-08-26 2014-08-19 Soupape de décharge pour système d'injection de carburant ainsi que système d'injection de carburant

Country Status (4)

Country Link
EP (1) EP3039280A1 (fr)
CN (1) CN105745430B (fr)
DE (1) DE102013216889B4 (fr)
WO (1) WO2015028353A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20161997A1 (it) * 2016-03-24 2017-09-24 Bosch Gmbh Robert Valvola per gruppo di pompaggio per alimentare combustibile ad un motore a combustione interna e gruppo di pompaggio
DE102016219486A1 (de) * 2016-10-07 2018-04-12 Robert Bosch Gmbh Drosselelement, insbesondere für eine Hochdruckpumpe, insbesondere eines Niederdruckkreis eines Kraftstoffeinspritzsystems
DE102017206607A1 (de) 2017-04-19 2018-10-25 Robert Bosch Gmbh Überströmventil
DE102018200247A1 (de) * 2018-01-10 2019-07-11 Robert Bosch Gmbh Ventilanordnung zur Gasdruckregelung, Kraftstoffsystem mit Ventilanordnung zur Gasdruckregelung
JP6714649B2 (ja) * 2018-07-17 2020-06-24 住友理工株式会社 コネクタ
JP6714784B1 (ja) * 2018-07-23 2020-06-24 住友理工株式会社 コネクタ

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Publication number Priority date Publication date Assignee Title
JP3555264B2 (ja) * 1995-07-14 2004-08-18 いすゞ自動車株式会社 内燃機関の燃料噴射装置
DE10057786A1 (de) * 2000-11-22 2002-06-06 Siemens Ag Einspritzsystem für eine Brennkraftmaschine und Verfahren zum Regeln und/oder Entlüften eines solchen Einspritzsystems
CN2697420Y (zh) * 2004-04-21 2005-05-04 华中科技大学 先导式水压溢流阀
JP4433043B2 (ja) * 2007-12-05 2010-03-17 株式会社デンソー 燃料供給装置
JP4518140B2 (ja) * 2007-12-05 2010-08-04 株式会社デンソー 燃料供給装置
JP4818405B2 (ja) * 2009-07-21 2011-11-16 三菱電機株式会社 燃料供給装置
DE102009047113A1 (de) * 2009-11-25 2011-05-26 Robert Bosch Gmbh Hochdruckpumpe mit mechanischer Vorförderpumpe
DE102011003362A1 (de) * 2011-01-31 2012-08-02 Robert Bosch Gmbh Überströmventil für ein Kraftstoffeinspritzsystem und Krafststoffeinspritzsystem mit Überströmventil
DE102011089797A1 (de) * 2011-12-23 2013-06-27 Robert Bosch Gmbh Überströmventil für ein Kraftstoffeinspritzsystem sowie Kraftstoffeinspritzsystem
DE102011089972A1 (de) * 2011-12-27 2013-06-27 Robert Bosch Gmbh Kraftstoffüberströmventil für eine Kraftstoffeinspritzeinrichtung und Kraftstoffeinspritzeinrichtung mit Kraftstoffüberströmventil
DE102012200894A1 (de) * 2012-01-23 2013-07-25 Robert Bosch Gmbh Kraftstoffhochdruckpumpe eines Einspritzsystems
DE102012200909A1 (de) * 2012-01-23 2013-07-25 Robert Bosch Gmbh Kraftstoffhochdruckpumpe eines Einspritzsystems

Non-Patent Citations (2)

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Title
None *
See also references of WO2015028353A1 *

Also Published As

Publication number Publication date
CN105745430A (zh) 2016-07-06
DE102013216889A1 (de) 2015-02-26
WO2015028353A1 (fr) 2015-03-05
DE102013216889B4 (de) 2016-08-11
CN105745430B (zh) 2019-04-05

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