EP3115592B1 - A control valve for fuel injector and a fuel injector - Google Patents

A control valve for fuel injector and a fuel injector Download PDF

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Publication number
EP3115592B1
EP3115592B1 EP16177766.9A EP16177766A EP3115592B1 EP 3115592 B1 EP3115592 B1 EP 3115592B1 EP 16177766 A EP16177766 A EP 16177766A EP 3115592 B1 EP3115592 B1 EP 3115592B1
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EP
European Patent Office
Prior art keywords
passage
valve
fuel
control valve
transverse
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.)
Active
Application number
EP16177766.9A
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German (de)
English (en)
French (fr)
Other versions
EP3115592A3 (en
EP3115592A2 (en
Inventor
Yanlin Chen
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3115592A2 publication Critical patent/EP3115592A2/en
Publication of EP3115592A3 publication Critical patent/EP3115592A3/en
Application granted granted Critical
Publication of EP3115592B1 publication Critical patent/EP3115592B1/en
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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
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves
    • 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
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the disclosure relates to a control valve used in a fuel injector as well as a fuel injector, in particular a diesel common rail injector, comprising such a control valve.
  • a fuel injector generally comprises a control valve and an injection valve, the fuel injection actions of the injection valve being controlled by switching the control valve between its opened and closed states.
  • Figure 1 schematically shows a partial structure of such a control valve, the control valve comprising a valve seat 1 which is formed with a fuel passage 2 and a valve seating surface 3, a spherical valve element 4 which cooperates with the valve seating surface 3 to achieve the opening and closing of the fuel passage 2, and a holding block 5 which accommodates a portion of the valve element 4.
  • the fuel passage 2 comprises a first passage 2a, a second passage 2b and a third passage 2c arranged in sequence in a longitudinal direction, as can be seen in Figure 2 .
  • the first passage 2a has a diameter smaller than that of the third passage 2c
  • the second passage 2b has a diameter smaller than that of the first passage 2a.
  • valve element 4 When the fuel passage 2 is opened, the valve element 4 is impacted by the fuel introduced from the injection valve via the fuel passage 2. As a result, after a long term service, a portion of the valve element 4 that faces towards the fuel passage 2 may be eroded under the impaction of a high pressure jet of fuel, especially fuel in gas state generated in the jet, so an erosion portion 6 will be formed, as shown in Figure 2 . For the reason that the valve element 4 is spherical, the valve element 4 may rotate slowly and randomly. When the erosion portion 6 is turned to a location facing towards the valve seating surface 3, the valve element 4 cannot close the fuel passage 2 effectively, which impedes the pressure accumulation in the fuel in the injection valve and thus causes malfunction of the fuel injector.
  • DE 195 16 565 A1 discloses a nozzle needle (4) that is axially slidable between a stop and open position in the valve housing (9). In the stop position it is pressed against a nozzle needle seat (6) with injection ports (5) by a piston (5).
  • a control chamber (2) is coupled to the valve (1) fuel inlet (7) via one or more closable ducts (14), with the control chamber pressure actuating the piston.
  • Into a valve seat (15) in the control chamber opens an intermediate chamber (12), coupled to the fuel inlet and to the control chamber, which has an outflow port (10) closable by a servo-member (8).
  • a stop valve for the fuel flow to the control chamber.
  • An object of the disclosure is to make improvements to the fuel injector to alleviate or prevent the above problems caused by the erosive impacting of the valve element in the prior art.
  • the first passage faces towards the valve element, and the second passage has a flow area smaller than that of the first passage.
  • the valve seat comprises a first portion and a second portion which are assembled together, one of the first and second portions being formed with a projection, the other one of the first and second portions being formed with a recess, the projection being inserted and fitted in the recess, the first passage and the turn-back passage being formed in the projection, and the second passage being formed in the second portion.
  • the first transverse segment is formed by a transverse through hole in the projection
  • the second transverse segment is formed by a transverse groove on an end surface of the projection
  • the longitudinal segment is formed by a longitudinal groove on a side surface of the projection.
  • the turn-back passage comprises a pair of turn-back passages opposite to each other in a transverse direction, the pair of turn-back passages comprising two first transverse segments formed by a common transverse through hole in the projection, two second transverse segments formed by a common transverse groove on the end surface of the projection, and two longitudinal segments formed respectively by two longitudinal grooves on opposite side surfaces of the projection.
  • the first passage is connected to a joining portion between the two first transverse segments
  • the second passage is connected to a joining portion between the two second transverse segments
  • the fuel passage further comprises a third passage connected between the second passage and the injection valve, the third passage has a flow area larger than that of the first passage.
  • the valve element comprises a solid sphere.
  • the disclosure in another aspect provides a fuel injector which comprises a control valve described above and an injection valve assembled to the control valve; wherein the fuel injection action of the injection valve is controlled in responsive to the opened/closed state of the control valve.
  • the fuel injector comprises a diesel common rail injector.
  • the injection valve comprises an injection valve cavity and a valve needle disposed in the injection valve cavity, the valve needle being configured to have a structure for operation in responsive to a pressure difference generated in the injection valve cavity when the control valve is being opened.
  • the fuel jet in the fuel passage may impact the valve element at a reduced pressure, and no gas-state fuel will be generated in the fuel jet, so the erosion of the valve element will be avoided or suppressed effectively.
  • the fuel passage of the control valve which is in a closed state, can be tightly closed effectively, and the function of the control valve can be reliably maintained in a long term.
  • Figure 3 shows in partial a fuel injector for injecting fuel into an engine according to a possible embodiment of the disclosure, in particular a fuel injector used in a common rail type diesel injection system.
  • the fuel injector comprises a control valve and an injection valve which is assembled together, for example, assembled in a common fuel injector casing 8 (not illustrated in detail).
  • the improvements made in the disclosure relate to the control valve, and so Figure 3 shows only corresponding portions relevant to the control valve.
  • the injection valve is assembled to a front side (lower side in Figure 3 ) of the control valve, facing towards the engine.
  • the control valve is switchable between an opened state and a closed state.
  • the fuel injection actions of the injection valve are controlled by the opened and closed states of the control valve.
  • the control valve has a central axis extending in a longitudinal direction, and comprises a valve seat 1 in which a fuel passage 2 is formed, and a valve seat cavity defined by a valve seating surface 3 and an inner peripheral surface 7.
  • the fuel passage 2 has a front end (lower end in Figure 3 ) opened into an injection valve cavity of the injection valve and a back end (upper end in Figure 3 ) opened into the valve seat cavity.
  • High pressure fuel that is supplied into the injection valve cavity can flow into the valve seat cavity via the fuel passage 2 to achieve partial pressure relief in the injection valve cavity.
  • the valve seating surface 3 is formed between the fuel passage 2 and inner peripheral surface 7. Both the valve seating surface 3 and inner peripheral surface 7 are conical surfaces, with the valve seating surface 3 having a bigger cone angle than the inner peripheral surface 7.
  • the control valve further comprises a valve element 4, preferably having a spherical shape, the valve element 4 being disposed in the valve seat cavity, facing the valve seating surface 3, and fitting with the valve seating surface 3 to achieve the opening and closing of the fuel passage 2.
  • the cone angle of the valve seating surface 3 facilitates the centering of the valve element 4.
  • the control valve further comprises a holding block 5, which is located axially behind the valve element 4 and is formed with an accommodating recess, the accommodating recess having a shape corresponding to the outer shape of a first or substantially back half portion of the valve element 4 for accommodating the first portion of the valve element 4, and a substantially front half portion of the valve element 4 being exposed and facing the valve seating surface 3 and the fuel passage 2.
  • the two portions of the valve element 4 may be formed to be integral with each other, or be formed separately and then assembled to each other.
  • the control valve further comprises an intermediate ring 9 disposed behind the valve seat 1 and a guiding tube 10 disposed behind the intermediate ring 9.
  • the guiding tube 10 comprises a tubular portion 10a extending in the axial direction and a flange member 10b extended radially outwards from a front end of the tubular portion 10a, the flange member 10b being formed with a plurality of through holes 10c extending therethrough axially.
  • the control valve further comprises an assembling sleeve 11 disposed behind the flange member 10b, the assembling sleeve 11 being fixed in the fuel injector casing 8 by screw threads or other means.
  • a circular space is formed between the assembling sleeve 11 and the tubular portion 10a.
  • a front end of the valve seat 1 is biased against a corresponding step in the fuel injector casing 8. In this way, the valve seat 1, the intermediate ring 9 and the guiding tube 10 are clamped together in the axial direction by means of the assembling sleeve 11.
  • the control valve further comprises an armature core 12 having a main body in the form of a cylinder extending in the axial direction and a circular flange 12a formed adjacent to a front end of the main body or assembled thereto and extending radially.
  • the main body of the armature core 12 inserts through an inner hole in the tubular portion 10a in an axially slidable manner, with the circular flange 12a being in front of the flange member 10b and mainly within an internal space of the intermediate ring 9.
  • the internal space of the intermediate ring 9 is in fluid communication with the circular space between the assembling sleeve 11 and the tubular portion 10a via the through holes 10c, and the internal space of the intermediate ring 9 is also in fluid communication with the valve seat cavity.
  • the front end of the main body of the armature core 12 is adhered to a back end of the holding block 5.
  • a back end (not shown) of the main body of the armature core 12 extends out of a back end of the tubular portion 10a.
  • a compressive spring 13 is disposed in the circular space between the assembling sleeve 11 and the tubular portion 10a, the compressive spring 13 having a front end biased against a back end surface of the flange member 10b and a back end applying an axially backward pushing force to the back end of the main body of the armature core 12 via an element or structure not shown.
  • the control valve further comprises a magnetic coil which generates an axially forward pushing force in the armature core 12 by electric-magnetic induction in an energized state.
  • the forward pushing force generated in the magnetic coil overcomes a backward pushing force provided by the compressive spring 13 and the fuel pressure in the fuel passage 2 so that the armature core 12 is in an advanced position as shown in Figure 3 and thus pushes the valve element 4 against the valve seating surface 3 via the holding block 5 to close the fuel passage 2 and achieve the closed state.
  • the back end surface of the circular flange 12a is separated from a front end surface of the flange member 10b by a small axial distance.
  • the injection valve comprises a valve needle (not shown) disposed in its injection valve cavity, and the opening and closing of the injection valve is controlled by the axial movement of the valve needle to perform fuel injection.
  • the magnetic coil in the control valve is energized so that the control valve comes into the closed state shown in Figure 3
  • the fuel for example, comes from a common rail
  • the valve needle in the injection valve closes the injection valve.
  • the magnetic coil in the control valve is de-energized so that the control valve comes into the opened state, so a portion of the fuel in the injection valve cavity flows into the control valve via the fuel passage 2.
  • the holding block 5 since there is a fuel film between the armature core 12 and the holding block 5, and the holding block 5 is always subjected to a fuel pressure from the fuel passage 2 (directly, or transmitted from the valve element 4 to the holding block 5), the holding block 5 always keeps to be adhered to the armature core 12 when the armature core 12 moves.
  • the fuel passage 2 comprises a first passage 2a, a pair of turn-back passages, a second passage 2b and a third passage 2c arranged in sequence in the back to front direction.
  • the first passage 2a, the second passage 2b and the third passage 2c extend in the longitudinal direction along the central axis.
  • the first passage 2a has a back end facing towards the valve element 4, forming a valve hole of the control valve.
  • the front end of the third passage 2c extends to the injection valve cavity of the injection valve.
  • the front end of the second passage 2b is connected to the back end of the third passage 2c, and the second passage 2b has a diameter smaller than that of each of the first passage 2a and the third passage 2c to form a throttle portion in the fuel passage 2.
  • the pair of turn-back passages are continuous between the front end of the first passage 2a and the back end of the second passage 2b, and the two turn-back passage are disposed to be opposite to each other in a transverse direction perpendicular to the central axis, and are preferably substantially symmetric with each other.
  • Each turn-back passage comprises a first transverse segment 2d extending transversely from the front end of the first passage 2a, a second transverse segment 2e extending transversely from the back end of the second passage 2b, and a longitudinal segment 2f continuous between the transversely outer ends of the first transverse segment 2d and the second transverse segment 2e.
  • the first transverse segment 2d and the second transverse segment 2e are parallel with each other and are much longer than the longitudinal segment 2f.
  • the valve seat 1 is divided into two portions, a first back portion 1a and a second front portion 1b.
  • the first portion 1a has a front end surface formed with a projection 14 protruded forwardly
  • the second portion 1b has back end surface formed with a recess 15 recessed forwardly.
  • the projection 14 and the recess 15 have shapes complementary with each other and dimensions fitting with each other, so that the projection 14 can be inserted and fitted in the recess 15 to achieve the assembled state of the first portion 1a and the second portion 1b as shown in Figure 4 , in which the front end surface of the first portion 1a abuts tightly against the back end surface of the second portion 1b, and the side surfaces and the front end surface of the projection 14 closely contact the side walls and the bottom wall that define the recess 15.
  • the first passage 2a and the pair of turn-back passages are formed in the first portion 1a, and the second passage 2b and the third passage 2c are formed in the second portion 1b.
  • the two first transverse segments 2d of the pair of turn-back passages are formed by a transverse through hole in the projection 14
  • the two second transverse segments 2e are formed by a the transverse groove on the front end surface of the projection 14
  • the two the longitudinal segments 2f are formed by longitudinal grooves on transversely opposite side surfaces of the projection 14.
  • the first passage 2a extends to the joining portion between the two first transverse segments 2d from the valve seat cavity.
  • the second passage 2b is formed to extend to the third passage 2c from the recess 15.
  • the back end of the second passage 2b is in fluid communication with the joining portion between the two second transverse segments 2e.
  • the projection 14 with the pair of turn-back passages may be formed on the second portion 1b, while the recess 15 is formed in the first portion 1a.
  • the length of the fuel passage 2 is significantly increased.
  • the first transverse segment 2d and the second transverse segment 2e extend transversely, the flow direction of the fuel changes several times.
  • the flow field of the fuel in the fuel passage 2 is changed remarkably.
  • the fuel is in a high pressure state in the third passage 2c and the second passage 2b, so the fuel in the joining portion (marked by "A" in Figure 7 ) between two second transverse segment 2e is still at a high pressure.
  • the high pressure fuel here impacts on the projection 14, and has no effect on the valve element 4.
  • the fuel changes direction several times in the pair of turn-back passages and the first passage 2a so the pressure of the fuel reduces gradually.
  • the fuel reaches the back end of the first passage 2a, the pressure and speed of it are both reduced, thus the fuel applies a smaller impact force on the valve element 4. After that, the fuel comes into the valve seat cavity and becomes gas state at a low pressure.
  • the flow path of the fuel is schematically marked by arrows in Figure 7 .
  • valve element 4 For the reason that the valve element 4 is subjected to reduced fuel impaction force and there is no impaction of gas-state fuel during the valve opening operation of the control valve, the portion of the valve element 4 that faces the fuel passage 2 is not likely to be eroded.
  • the valve element 4 always effectively guarantee that the fuel passage of the control valve is closed when the control valve is in the closed state, so the function of the control valve can be maintained in a long time. As a result, the service time of the control valve, or even of the whole fuel injector, can be prolonged.
  • the number of the turn-back passages is not limited to a pair, and one, three or more can be adopted.
  • the shape of the turn-back passage is not limited to the illustrated one.
  • the two-part form of the valve seat 1 may not be used; rather, the portions of the fuel passage 2 may be formed directly in the valve seat 1 which is in the form of a single part.
  • Other changes to the structural details of the control valve can also be conceived.

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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)
EP16177766.9A 2015-07-08 2016-07-04 A control valve for fuel injector and a fuel injector Active EP3115592B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520490076.7U CN204877754U (zh) 2015-07-08 2015-07-08 用于燃油喷射器的控制阀及燃油喷射器

Publications (3)

Publication Number Publication Date
EP3115592A2 EP3115592A2 (en) 2017-01-11
EP3115592A3 EP3115592A3 (en) 2017-01-25
EP3115592B1 true EP3115592B1 (en) 2018-03-28

Family

ID=54822136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16177766.9A Active EP3115592B1 (en) 2015-07-08 2016-07-04 A control valve for fuel injector and a fuel injector

Country Status (2)

Country Link
EP (1) EP3115592B1 (zh)
CN (1) CN204877754U (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017101999A1 (de) * 2017-02-01 2018-08-02 Firma L'orange Gmbh Kraftstoff-Einspritzinjektor für eine Brennkraftmaschine
CN111472906A (zh) * 2020-03-20 2020-07-31 常熟理工学院 燃料喷射阀部件

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19516565C2 (de) * 1995-05-05 1998-07-30 Orange Gmbh Einspritzventil einer Brennkraftmaschine
DE10046416C2 (de) * 2000-09-18 2002-11-07 Orange Gmbh Ventilausbildung für Steuerventile
ITTO20010970A1 (it) * 2001-10-12 2003-04-12 Fiat Ricerche Inettore di combustibile per un motore a combustione interna.
DE102005053133A1 (de) * 2005-11-08 2007-05-10 Robert Bosch Gmbh Kavitationsoptimierter Kraftstoffinjektor
DE602008003324D1 (de) * 2008-06-27 2010-12-16 Fiat Ricerche Brennstoffeinspritzvorrichtung mit Mess-Servoventil für einen Verbrennungsmotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3115592A3 (en) 2017-01-25
EP3115592A2 (en) 2017-01-11
CN204877754U (zh) 2015-12-16

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