EP3112663B1 - Fuel injector and control valve thereof - Google Patents
Fuel injector and control valve thereof Download PDFInfo
- Publication number
- EP3112663B1 EP3112663B1 EP16170837.5A EP16170837A EP3112663B1 EP 3112663 B1 EP3112663 B1 EP 3112663B1 EP 16170837 A EP16170837 A EP 16170837A EP 3112663 B1 EP3112663 B1 EP 3112663B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- central axis
- valve element
- injection
- control 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.)
- Active
Links
- 239000000446 fuel Substances 0.000 title claims description 60
- 238000002347 injection Methods 0.000 claims description 56
- 239000007924 injection Substances 0.000 claims description 56
- 230000009471 action Effects 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 230000003628 erosive effect Effects 0.000 description 11
- 230000002093 peripheral effect Effects 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
-
- 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
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- 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
- F02M2200/05—Fuel-injection apparatus having means for preventing corrosion
Definitions
- the disclosure relates to a control valve used in a fuel injector and a fuel injector, in particular a common rail type fuel injector, comprising such a control valve.
- a fuel injector generally comprises a control valve and an injection valve, the fuel injection action 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 valve hole 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 valve hole 2, and a holding block 5 which accommodates a portion of the valve element 4 and acts to push the valve element 4 towards a position where it closes the valve hole 2.
- the valve hole 2, the valve element 4 and the holding block 5 are disposed along a central axis Z that extends in a longitudinal direction of the control valve.
- valve element 4 When the valve element 4 is pushed by the holding block 5 to be biased against the valve seating surface 3, pressure accumulation of the fuel in the injection valve is effected. Once the pushing force from the holding block 5 disappears, the valve element 4 leaves the valve seating surface 3, and a portion of the fuel in the injection valve flows into the control valve via the valve hole 2 so that pressure difference is established in the injection valve and thus a fuel injection action of the injection valve is performed.
- valve element 4 When the valve hole 2 is opened, the valve element 4 is impacted by the fuel introduced from the injection valve via the valve hole 2. As a result, after a long term service, an erosion portion 6 may be formed in a portion of the valve element 4 that faces towards the valve hole 2 due to erosive impaction of the fuel, as shown in Figure 2 .
- the valve element 4 may rotate slowly and randomly around the longitudinal central axis Z and transverse axes that are perpendicular to the longitudinal central axis Z with respect to the holding block 5, as indicated by arrows in this figure.
- the erosion portion 6 When the erosion portion 6 is turned to a location facing towards the valve seating surface 3, as shown in Figure 3 , the valve element 4 cannot close the valve hole 2 effectively, which impedes the pressure accumulation in the fuel in the injection valve and thus causes malfunction of the fuel injector.
- FR 2 973 092 A1 discloses a control valve according to the preamble of claim 1.
- 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 present invention provides a control valve according to claim 1.
- a control valve that can be used in a fuel injector, the control valve comprising: a valve seat defining a valve seating surface and a valve hole extending through the center portion of the valve seating surface in a longitudinal direction, the valve hole and the valve seating surface defining a longitudinal central axis, and the valve hole being in communication with an injection valve of the fuel injector; a valve element configured to be moved between a closed position and an opened position along the longitudinal central axis, the valve element being in contact and fitting with the valve seat in the closed position to close the valve hole, and the valve element being moved away from the valve seat in the opened position to open the valve hole; and a holding block having an accommodating recess for holding the valve element; wherein the valve element is in the form of a solid of revolution, with the longitudinal central axis being the revolution axis of the solid of revolution, and the solid of revolution having a non-circular section in a longitudinal plane in which the longitudinal central axis lies so that the valve element is able to
- the valve element comprises a first portion received in the accommodating recess and a second portion exposed from the holding block, and the valve element is able to rotate around the longitudinal central axis by means of form fitting between the first portion and the accommodating recess.
- the valve element is unable to rotate around any transverse central axis (X, Y) that is perpendicular to the longitudinal central axis.
- control valve further comprises a biasing mechanism configured for selectively applying a pushing force to the holding block so that the valve element is moved towards the closed position under the action of the holding block.
- control valve further comprises a returning mechanism configured for forcing the biasing mechanism to move towards its home location in a direction opposite to its pushing force applying direction.
- the valve element is pushed to the opened position from the closed position under the action of high pressure fuel introduced from an injection valve cavity via the valve hole.
- a fuel injector in particular a common rail type fuel injector, comprising a control valve described above and an injection valve assembled to be in combination with the control valve; wherein the injection valve performs fuel injection in responsive to the opened/closed state of the control valve.
- the injection valve comprises an injection valve cavity and a valve needle disposed in the injection valve cavity; wherein when the valve element of the control valve is in the opened position, a portion of high pressure fuel contained in the injection valve cavity flows into the control valve via the valve hole of the control valve so that a pressure difference appears between front and back sides of the valve needle, and the valve needle moves backwards because of the pressure difference to open the injection valve so that a fuel injection action is performed.
- the valve element by using a non-spherical valve element in the form of a solid of revolution with the revolution axis of it along the longitudinal central axis, the valve element is able to rotate around the longitudinal central axis, and by means of the fitting between the valve element and the holding block and/or the fitting between the valve element and the valve seating surface, the valve element is unable to rotate around any transverse central axis, so that the valve hole of the control valve, which is in a closed state, can always be effectively closed tightly even if there is any erosion in the valve element, and the function of the control valve can be reliably maintained in a long term.
- Figure 4 shows in partial an example of a fuel injector for injecting fuel into an engine, 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 relate to the control valve, and so Figure 4 only shows corresponding portions relevant to the control valve.
- the injection valve is assembled to a front side (lower side in Figure 4 ) 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 Z extending in a longitudinal direction, and comprises a valve seat 1 in which a valve hole 2 extending in the longitudinal direction is formed, and a valve seat cavity defined by a valve seating surface 3 and an inner peripheral surface 7.
- the central axis of the valve hole 2 coincides with the longitudinal central axis Z, and the valve hole 2 has a front end (lower end in Figure 4 ) opened into an injection valve cavity of the injection valve and a back end (upper end in Figure 4 ) 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 valve hole 2 to create partial pressure relief in the injection valve cavity.
- the valve seating surface 3 is formed between the valve hole 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 in the form of an oblate spheroid which is formed by rotating an ellipse around the central axis Z, the valve element 4 being 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 valve hole 2.
- the cone angle of the valve seating surface 3 facilitates the centering of the valve element 4.
- the oblate spheroid forming the valve element 4 has a shorter semi-axis length in the longitudinal central axis Z and two longer semi-axis lengths (the two longer semi-axis lengths being equal to each other) transverse central axes X, Y that are perpendicular to the longitudinal central axis Z so that the valve element 4 has an elliptical section in a front view ( Figure 5 ) and a side view ( Figure 6 ) made perpendicular to the longitudinal central axis Z and a circular section in a top view ( Figure 7 ) made in the longitudinal central axis Z.
- 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 portion (substantially back half portion) of the valve element 4 for accommodating the first portion of the valve element 4, and a second portion (substantially front half portion) of the valve element 4 being exposed and facing the valve seating surface 3 and the valve hole 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 valve hole 2 so that the armature core 12 is in an advanced position as shown in Figure 4 and thus pushes the valve element 4 against the valve seating surface 3 via the holding block 5 to close the valve hole 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.
- control valve has their central axes generally aligned with the longitudinal central axis Z.
- 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 4
- 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 valve hole 2.
- the valve needle moves backwards to open the injection valve, so a fuel injection action is performed.
- the fuel that flows into the control valve via the valve hole 2 will then flow through the valve seat cavity, the internal space of the intermediate ring 9, the through holes 10c, and the circular space between the assembling sleeve 11 and the tubular portion 10a in sequence, and finally flows back to a fuel tank.
- the magnetic coil in the control valve is energized again so that the control valve comes to the closed state again, and thus the injection valve is switched to the pressure accumulation state until the fuel pressures at the front and back sides of the valve needle become the same level. Now the valve needle closes the injection valve under a returning element for the valve needle. Then, the next fuel injection action will be performed.
- the forward pushing force applied to the holding block 5 is generated by the magnetic coil and the armature core 12. It is appreciated that, however, other forms of biasing mechanisms may alternatively be used for applying a forward pushing force to the holding block 5 so that the valve element 4 is biased against the valve seating surface 2 to close the valve hole 2.
- the armature core 12 returns to its home position by means of the compressive spring 13 to release the forward pushing force applied to the holding block 5. It is appreciated that, however, other forms of returning mechanisms may alternatively be used for forcing the biasing mechanism to move back to its home position so that the valve element 4 can leave the valve seating surface 3 to open the valve hole 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 valve hole 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.
- a locating structure of the type of form fitting may be provided at the interface between them.
- valve element 4 As shown in Figure 8 , for the reason that the valve element 4 is in the form of an oblate spheroid with the longitudinal central axis Z as its revolution axis, and that the holding block 5 is formed with the accommodating recess for accommodating and forming form fitting with the first portion of the valve element 4, the valve element 4 has the ability of rotating slowly around the longitudinal central axis Z with respect to the holding block 5 and the valve seat 1, as indicated by the arrow in this figure, but the valve element 4 is unable to rotate around the two transverse central axes X, Y.
- valve element 4 When the control valve is switched from closed state to the opened state, as the valve element 4 leaves the valve seating surface 3 axially backwards, the high pressure fuel comes from the injection valve via the valve hole 2 will impact the valve element 4 in the form of jet flow.
- the jet flow which is mainly fuel in gas state
- a portion of the valve element 4 that faces towards the valve hole 2 is subjected to erosive impaction and thus an erosion portion 6 will be formed, as shown in Figure 9 .
- the erosion portion 6 since the valve element 4 is not able to rotate around its transverse central axes X, Y, the erosion portion 6 always faces towards the valve hole 2 and cannot comes to a position facing the valve seating surface 3 even if the valve element 4 rotates around the longitudinal central axis Z.
- valve element 4 by means of the fitting between the oblate spheroidal valve element 4 and the holding block 5, the valve element 4 restricted from rotating around any transverse central axis. It is appreciated that the valve element 4 may alternatively be in the form of other solids of revolution to achieve the same function.
- the valve element 4 is formed by combination of a first portion in the form of a half oblate spheroid fitting in the holding block 5 and a second portion in the form of a semi sphere exposed from the holding block 5, the two portions each having the longitudinal central axis Z as its revolution axis.
- the valve element 4 has the ability of rotating around the longitudinal central axis Z but does not have the ability of rotating around any transverse central axis.
- the valve element 4 is formed by combination of a first portion in the form of a truncated cone fitting in the holding block 5 and a second portion in the form of a semi sphere exposed from the holding block 5, the two portions each having the longitudinal central axis Z as its revolution axis.
- the valve element 4 has the ability of rotating around the longitudinal central axis Z but does not have the ability of rotating around any transverse central axis.
- the valve element 4 is formed by combination of a first portion in the form of a cylinder in the holding block 5 and a second portion in the form of a semi sphere exposed from the holding block 5, the two portions each having the longitudinal central axis Z as its revolution axis.
- the valve element 4 has the ability of rotating around the longitudinal central axis Z but does not have the ability of rotating around any transverse central axis.
- Other shapes (including combined shapes) of the first portion for obtaining the above functions can also be contemplated.
- a first portion of the valve element 4 which fits in the holding block 5 is in the form of a semi sphere, and a second portion exposed from the holding block 5 has a main body in the form of substantial cylinder, with a front peripheral portion (the transition portion between the cylindrical surface and a flat front end surface) of the second portion forming a conical portion 4a.
- the conical portion 4a has a cone angle equal to the cone angle of the valve seating surface 3, and thus forms sealing contact with the valve seating surface 3.
- the holding block 5 transmits the axially forward pushing force induced by the magnetic coil on the armature core 12 to the valve element 4 to forcefully pushing the valve element 4 against the valve seating surface 3, so the valve element 4 is automatically centered by means of the fitting between the conical portion 4a and the valve seating surface 3. In this way, any possible micro rotation of the valve element 4 around any transverse central axis can be eliminated or corrected, and thus the portion of the valve element 4 that faces towards the valve hole 2 cannot be misplaced transversely.
- a first portion of the valve element 4 which fits in the holding block 5 is in the form of a semi sphere, and a second portion exposed from the holding block 5 is in the form of a substantial cone.
- a portion of the valve seating surface 3 that is corresponding to the second portion of the valve element 4 is reformed to have the same cone angle with the second portion of the valve element 4. In this way, the valve element 4 is automatically centered by means of the dynamic fitting between the second portion of the valve element 4 and corresponding portion of the valve seating surface 3, so any possible micro rotation of the valve element 4 around any transverse central axis can be eliminated or corrected.
- a first portion of the valve element 4 which fits in the holding block 5 is in the form of a truncated cone (similar to that shown in Figure 11 ), and a second portion exposed from the holding block 5 has a main body in the form of substantial cylinder with a front peripheral portion formed as a conical portion 4a (similar to that shown in Figure 13 ).
- valve element 4 rotating around any transverse central axis is eliminated by means of the static fitting between the first portion of the valve element 4 and the holding block 5, and the valve element 4 is given the automatic centering ability thanks for the fitting between the second portion of the valve element 4 and the valve seating surface 3, so the valve element 4 is additionally prevented from rotating around any transverse central axis.
- Other combined fitting solution can also be contemplated.
- valve element 4 possesses the ability of rotating around the longitudinal central axis (which provides flexibility in the assemble and operation of the control valve) by forming the valve element 4 as a solid of revolution with the longitudinal central axis Z as its revolution axis, but the valve element 4 has a non-circular section in any longitudinal plane that passes through the longitudinal central axis Z.
- fitting static fitting
- fitting dynamic fitting
- the portion of the valve element 4 that faces towards the valve hole 2 is maintained to be not misplaced in any transverse direction and thus cannot moves to a position facing the valve seating surface 3.
- the valve element 4 Even if erosion is formed on the portion of the valve element 4 that faces towards the valve hole 2 by fuel impaction, the valve element 4 always effectively guarantee that the valve hole 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.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- The disclosure relates to a control valve used in a fuel injector and a fuel injector, in particular a common rail type fuel injector, comprising such a control valve.
- A fuel injector generally comprises a control valve and an injection valve, the fuel injection action 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 avalve seat 1 which is formed with avalve hole 2 and avalve seating surface 3, aspherical valve element 4 which cooperates with thevalve seating surface 3 to achieve the opening and closing of thevalve hole 2, and aholding block 5 which accommodates a portion of thevalve element 4 and acts to push thevalve element 4 towards a position where it closes thevalve hole 2. Thevalve hole 2, thevalve element 4 and theholding block 5 are disposed along a central axis Z that extends in a longitudinal direction of the control valve. When thevalve element 4 is pushed by theholding block 5 to be biased against thevalve seating surface 3, pressure accumulation of the fuel in the injection valve is effected. Once the pushing force from theholding block 5 disappears, thevalve element 4 leaves thevalve seating surface 3, and a portion of the fuel in the injection valve flows into the control valve via thevalve hole 2 so that pressure difference is established in the injection valve and thus a fuel injection action of the injection valve is performed. - When the
valve hole 2 is opened, thevalve element 4 is impacted by the fuel introduced from the injection valve via thevalve hole 2. As a result, after a long term service, anerosion portion 6 may be formed in a portion of thevalve element 4 that faces towards thevalve hole 2 due to erosive impaction of the fuel, as shown inFigure 2 . For the reason that thevalve element 4 is spherical, thevalve element 4 may rotate slowly and randomly around the longitudinal central axis Z and transverse axes that are perpendicular to the longitudinal central axis Z with respect to theholding block 5, as indicated by arrows in this figure. When theerosion portion 6 is turned to a location facing towards thevalve seating surface 3, as shown inFigure 3 , thevalve element 4 cannot close thevalve hole 2 effectively, which impedes the pressure accumulation in the fuel in the injection valve and thus causes malfunction of the fuel injector. -
FR 2 973 092 A1claim 1. - 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 present invention provides a control valve according to
claim 1. - According to one aspect of the disclosure, there provides a control valve that can be used in a fuel injector, the control valve comprising: a valve seat defining a valve seating surface and a valve hole extending through the center portion of the valve seating surface in a longitudinal direction, the valve hole and the valve seating surface defining a longitudinal central axis, and the valve hole being in communication with an injection valve of the fuel injector; a valve element configured to be moved between a closed position and an opened position along the longitudinal central axis, the valve element being in contact and fitting with the valve seat in the closed position to close the valve hole, and the valve element being moved away from the valve seat in the opened position to open the valve hole; and a holding block having an accommodating recess for holding the valve element; wherein the valve element is in the form of a solid of revolution, with the longitudinal central axis being the revolution axis of the solid of revolution, and the solid of revolution having a non-circular section in a longitudinal plane in which the longitudinal central axis lies so that the valve element is able to rotate around the longitudinal central axis but cannot rotate around any transverse central axis which is perpendicular to the longitudinal central axis.
- According to the invention, the valve element comprises a first portion received in the accommodating recess and a second portion exposed from the holding block, and the valve element is able to rotate around the longitudinal central axis by means of form fitting between the first portion and the accommodating recess.
- According to the invention, by means of form fitting between the second portion and the valve seating surface, the valve element is unable to rotate around any transverse central axis (X, Y) that is perpendicular to the longitudinal central axis.
- According to a possible embodiment of the disclosure, the control valve further comprises a biasing mechanism configured for selectively applying a pushing force to the holding block so that the valve element is moved towards the closed position under the action of the holding block.
- According to a possible embodiment of the disclosure, the control valve further comprises a returning mechanism configured for forcing the biasing mechanism to move towards its home location in a direction opposite to its pushing force applying direction.
- According to a possible embodiment of the disclosure, the valve element is pushed to the opened position from the closed position under the action of high pressure fuel introduced from an injection valve cavity via the valve hole.
- According to another aspect of the disclosure, there provides a fuel injector, in particular a common rail type fuel injector, comprising a control valve described above and an injection valve assembled to be in combination with the control valve; wherein the injection valve performs fuel injection in responsive to the opened/closed state of the control valve.
- According to a possible embodiment of the disclosure, the injection valve comprises an injection valve cavity and a valve needle disposed in the injection valve cavity; wherein when the valve element of the control valve is in the opened position, a portion of high pressure fuel contained in the injection valve cavity flows into the control valve via the valve hole of the control valve so that a pressure difference appears between front and back sides of the valve needle, and the valve needle moves backwards because of the pressure difference to open the injection valve so that a fuel injection action is performed.
- According to the disclosure, by using a non-spherical valve element in the form of a solid of revolution with the revolution axis of it along the longitudinal central axis, the valve element is able to rotate around the longitudinal central axis, and by means of the fitting between the valve element and the holding block and/or the fitting between the valve element and the valve seating surface, the valve element is unable to rotate around any transverse central axis, so that the valve hole of the control valve, which is in a closed state, can always be effectively closed tightly even if there is any erosion in the valve element, and the function of the control valve can be reliably maintained in a long term.
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Figure 1 is a partial schematic sectional view of a control valve used in a fuel injector according to prior art. -
Figure 2 is a schematic view for explaining the corrosion and turning of the valve element of the control valve shown inFigure 1 . -
Figure 3 is a schematic view for explaining a problem resulted from the corrosion of the valve element of the control valve shown inFigure 1 -
Figure 4 is a schematic sectional view of an example of a fuel injector. -
Figures 5 to 7 are views of an example of a valve element of a control valve in the fuel injector shown inFigure 4 made in different directions. -
Figure 8 is a schematic view for explaining the rotation ability of the example of the valve element. -
Figure 9 is a schematic view for explaining the erosion of the example of the valve element. -
Figures 10 to 12 are schematic views for explaining some alternative structures of the example of the valve element. -
Figures 13 to 15 are schematic views for explaining some alternative structures of the valve element of the disclosure. - Some possible embodiments of the disclosure will be described with reference to the drawings.
-
Figure 4 shows in partial an example of a fuel injector for injecting fuel into an engine, 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 relate to the control valve, and soFigure 4 only shows corresponding portions relevant to the control valve. The injection valve is assembled to a front side (lower side inFigure 4 ) 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 Z extending in a longitudinal direction, and comprises a
valve seat 1 in which avalve hole 2 extending in the longitudinal direction is formed, and a valve seat cavity defined by avalve seating surface 3 and an innerperipheral surface 7. The central axis of thevalve hole 2 coincides with the longitudinal central axis Z, and thevalve hole 2 has a front end (lower end inFigure 4 ) opened into an injection valve cavity of the injection valve and a back end (upper end inFigure 4 ) 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 thevalve hole 2 to create partial pressure relief in the injection valve cavity. Thevalve seating surface 3 is formed between thevalve hole 2 and innerperipheral surface 7. Both thevalve seating surface 3 and innerperipheral surface 7 are conical surfaces, with thevalve seating surface 3 having a bigger cone angle than the innerperipheral surface 7. - The control valve further comprises a
valve element 4 in the form of an oblate spheroid which is formed by rotating an ellipse around the central axis Z, thevalve element 4 being in the valve seat cavity, facing thevalve seating surface 3, and fitting with thevalve seating surface 3 to achieve the opening and closing of thevalve hole 2. The cone angle of thevalve seating surface 3 facilitates the centering of thevalve element 4. The oblate spheroid forming thevalve element 4 has a shorter semi-axis length in the longitudinal central axis Z and two longer semi-axis lengths (the two longer semi-axis lengths being equal to each other) transverse central axes X, Y that are perpendicular to the longitudinal central axis Z so that thevalve element 4 has an elliptical section in a front view (Figure 5 ) and a side view (Figure 6 ) made perpendicular to the longitudinal central axis Z and a circular section in a top view (Figure 7 ) made in the longitudinal central axis Z. - The control valve further comprises a
holding block 5, which is located axially behind thevalve element 4 and is formed with an accommodating recess, the accommodating recess having a shape corresponding to the outer shape of a first portion (substantially back half portion) of thevalve element 4 for accommodating the first portion of thevalve element 4, and a second portion (substantially front half portion) of thevalve element 4 being exposed and facing thevalve seating surface 3 and thevalve hole 2. The two portions of thevalve 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 thevalve seat 1 and a guidingtube 10 disposed behind theintermediate ring 9. The guidingtube 10 comprises atubular portion 10a extending in the axial direction and aflange member 10b extended radially outwards from a front end of thetubular portion 10a, theflange member 10b being formed with a plurality of throughholes 10c extending therethrough axially. - The control valve further comprises an assembling
sleeve 11 disposed behind theflange member 10b, the assemblingsleeve 11 being fixed in thefuel injector casing 8 by screw threads or other means. A circular space is formed between the assemblingsleeve 11 and thetubular portion 10a. In additional, a front end of thevalve seat 1 is biased against a corresponding step in thefuel injector casing 8. In this way, thevalve seat 1, theintermediate ring 9 and the guidingtube 10 are clamped together in the axial direction by means of the assemblingsleeve 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 acircular flange 12a formed adjacent to a front end of the main body or assembled thereto and extending radially. The main body of thearmature core 12 inserts through an inner hole in thetubular portion 10a in an axially slidable manner, with thecircular flange 12a being in front of theflange member 10b and mainly within an internal space of theintermediate ring 9. The internal space of theintermediate ring 9 is in fluid communication with the circular space between the assemblingsleeve 11 and thetubular portion 10a via the throughholes 10c, and the internal space of theintermediate 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 theholding block 5. A back end (not shown) of the main body of thearmature core 12 extends out of a back end of thetubular portion 10a. Acompressive spring 13 is disposed in the circular space between the assemblingsleeve 11 and thetubular portion 10a, thecompressive spring 13 having a front end biased against a back end surface of theflange member 10b and a back end applying an axially backward pushing force to the back end of the main body of thearmature 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 thecompressive spring 13 and the fuel pressure in thevalve hole 2 so that thearmature core 12 is in an advanced position as shown inFigure 4 and thus pushes thevalve element 4 against thevalve seating surface 3 via the holdingblock 5 to close thevalve hole 2 and achieve the closed state. In this position, the back end surface of thecircular flange 12a is separated from a front end surface of theflange member 10b by a small axial distance. For the sake of clarity, this axial distance is shown in a larger scale inFigure 4 , but it is very small in actual. Once the magnetic coil is de-energized, the forward pushing force generated by the magnetic coil disappears, and thearmature core 12 is moved axially backwards under the backward pushing force of thecompressive spring 13 and the fuel pressure in thevalve hole 2 until the back end surface of thecircular flange 12a comes into contact with the front end surface of theflange member 10b. Meanwhile, thevalve element 4 moves axially backwards together with thearmature core 12 under the action of the fuel pressure in thevalve hole 2 to leave thevalve seating surface 3 and open thevalve hole 2, so the control valve is switched to the opened state. - The above components of the control valve have their central axes generally aligned with the longitudinal central axis Z.
- 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. When the magnetic coil in the control valve is energized so that the control valve comes into the closed state shown in
Figure 4 , the fuel (for example, comes from a common rail) supplied into the injection valve cavity is under a pressure accumulation state, so that ultimately every portion of the injection valve cavity becomes under high pressure, and then the valve needle in the injection valve closes the injection valve. - After that, 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
valve hole 2. This results in lowering down of the pressure of the fuel behind the valve needle, so that a pressure difference presents between front and back sides of the valve needle. Under this pressure difference, the valve needle moves backwards to open the injection valve, so a fuel injection action is performed. The fuel that flows into the control valve via thevalve hole 2 will then flow through the valve seat cavity, the internal space of theintermediate ring 9, the throughholes 10c, and the circular space between the assemblingsleeve 11 and thetubular portion 10a in sequence, and finally flows back to a fuel tank. Then, the magnetic coil in the control valve is energized again so that the control valve comes to the closed state again, and thus the injection valve is switched to the pressure accumulation state until the fuel pressures at the front and back sides of the valve needle become the same level. Now the valve needle closes the injection valve under a returning element for the valve needle. Then, the next fuel injection action will be performed. - The forward pushing force applied to the holding
block 5 is generated by the magnetic coil and thearmature core 12. It is appreciated that, however, other forms of biasing mechanisms may alternatively be used for applying a forward pushing force to the holdingblock 5 so that thevalve element 4 is biased against thevalve seating surface 2 to close thevalve hole 2. - In addition, the
armature core 12 returns to its home position by means of thecompressive spring 13 to release the forward pushing force applied to the holdingblock 5. It is appreciated that, however, other forms of returning mechanisms may alternatively be used for forcing the biasing mechanism to move back to its home position so that thevalve element 4 can leave thevalve seating surface 3 to open thevalve hole 2. - In addition, it is noted that, since there is a fuel film between the
armature core 12 and the holdingblock 5, and the holdingblock 5 is always subjected to a fuel pressure from the valve hole 2 (directly, or transmitted from thevalve element 4 to the holding block 5), the holdingblock 5 always keeps to be adhered to thearmature core 12 when thearmature core 12 moves. In order to guarantee proper alignment between the holdingblock 5 and thearmature core 12, a locating structure of the type of form fitting may be provided at the interface between them. - As shown in
Figure 8 , for the reason that thevalve element 4 is in the form of an oblate spheroid with the longitudinal central axis Z as its revolution axis, and that the holdingblock 5 is formed with the accommodating recess for accommodating and forming form fitting with the first portion of thevalve element 4, thevalve element 4 has the ability of rotating slowly around the longitudinal central axis Z with respect to the holdingblock 5 and thevalve seat 1, as indicated by the arrow in this figure, but thevalve element 4 is unable to rotate around the two transverse central axes X, Y. - When the control valve is switched from closed state to the opened state, as the
valve element 4 leaves thevalve seating surface 3 axially backwards, the high pressure fuel comes from the injection valve via thevalve hole 2 will impact thevalve element 4 in the form of jet flow. During long term operation, the jet flow, which is mainly fuel in gas state, a portion of thevalve element 4 that faces towards thevalve hole 2 is subjected to erosive impaction and thus anerosion portion 6 will be formed, as shown inFigure 9 . However, since thevalve element 4 is not able to rotate around its transverse central axes X, Y, theerosion portion 6 always faces towards thevalve hole 2 and cannot comes to a position facing thevalve seating surface 3 even if thevalve element 4 rotates around the longitudinal central axis Z. In this way, even if theerosion portion 6 is formed on thevalve element 4, it will not result in closing deficiency of thevalve hole 2. In addition, thanks for the ability of being only able to rotate around the longitudinal central axis Z of thevalve element 4, which is in the form of an oblate spheroid around the longitudinal central axis Z, the contact portion of thevalve element 4 and thevalve seating surface 3 is always a complete circle, which effectively guarantees to close the control valve in the closed state, so the function of the control valve will not be lowered down. - In the
valve element 4 as described above, by means of the fitting between the oblatespheroidal valve element 4 and the holdingblock 5, thevalve element 4 restricted from rotating around any transverse central axis. It is appreciated that thevalve element 4 may alternatively be in the form of other solids of revolution to achieve the same function. - For example, as shown in
Figure 10 , thevalve element 4 is formed by combination of a first portion in the form of a half oblate spheroid fitting in the holdingblock 5 and a second portion in the form of a semi sphere exposed from the holdingblock 5, the two portions each having the longitudinal central axis Z as its revolution axis. By means of the fitting between first portion in the form of a half oblate spheroid and the fitting accommodating recess in the holdingblock 5, thevalve element 4 has the ability of rotating around the longitudinal central axis Z but does not have the ability of rotating around any transverse central axis. - In
Figure 11 , thevalve element 4 is formed by combination of a first portion in the form of a truncated cone fitting in the holdingblock 5 and a second portion in the form of a semi sphere exposed from the holdingblock 5, the two portions each having the longitudinal central axis Z as its revolution axis. By means of the fitting between first portion in the form of a truncated cone and the fitting accommodating recess in the holdingblock 5, thevalve element 4 has the ability of rotating around the longitudinal central axis Z but does not have the ability of rotating around any transverse central axis. - In the example shown in
Figure 12 , thevalve element 4 is formed by combination of a first portion in the form of a cylinder in the holdingblock 5 and a second portion in the form of a semi sphere exposed from the holdingblock 5, the two portions each having the longitudinal central axis Z as its revolution axis. By means of the fitting between first portion in the form of a cylinder and the fitting accommodating recess in the holdingblock 5, thevalve element 4 has the ability of rotating around the longitudinal central axis Z but does not have the ability of rotating around any transverse central axis. Other shapes (including combined shapes) of the first portion for obtaining the above functions can also be contemplated. - According to the invention the ability of the
valve element 4 rotating around the transverse central axes is eliminated by means of the fitting between thevalve element 4 and the valve seating surface 3 (which can be referred to as dynamic fitting since the fitting between thevalve element 4 and thevalve seating surface 3 only exists when the control valve is closed). For example, in the embodiment shown inFigure 13 , a first portion of thevalve element 4 which fits in the holdingblock 5 is in the form of a semi sphere, and a second portion exposed from the holdingblock 5 has a main body in the form of substantial cylinder, with a front peripheral portion (the transition portion between the cylindrical surface and a flat front end surface) of the second portion forming aconical portion 4a. Theconical portion 4a has a cone angle equal to the cone angle of thevalve seating surface 3, and thus forms sealing contact with thevalve seating surface 3. When the control valve is closed, the holdingblock 5 transmits the axially forward pushing force induced by the magnetic coil on thearmature core 12 to thevalve element 4 to forcefully pushing thevalve element 4 against thevalve seating surface 3, so thevalve element 4 is automatically centered by means of the fitting between theconical portion 4a and thevalve seating surface 3. In this way, any possible micro rotation of thevalve element 4 around any transverse central axis can be eliminated or corrected, and thus the portion of thevalve element 4 that faces towards thevalve hole 2 cannot be misplaced transversely. - In the embodiment shown in
Figure 14 , a first portion of thevalve element 4 which fits in the holdingblock 5 is in the form of a semi sphere, and a second portion exposed from the holdingblock 5 is in the form of a substantial cone. In addition, a portion of thevalve seating surface 3 that is corresponding to the second portion of thevalve element 4 is reformed to have the same cone angle with the second portion of thevalve element 4. In this way, thevalve element 4 is automatically centered by means of the dynamic fitting between the second portion of thevalve element 4 and corresponding portion of thevalve seating surface 3, so any possible micro rotation of thevalve element 4 around any transverse central axis can be eliminated or corrected. - Other shapes (including combined shapes) of the second portion for obtaining the above functions can also be contemplated, so that solutions in which the ability of the
valve element 4 rotating around the transverse central axes is prevented by means of various dynamic fitting manners can be designed out. In these cases, the ability of thevalve element 4 rotating around the longitudinal central axis Z is also provided by means of the fitting between the first portion of thevalve element 4 and the fitting accommodating recess in the holdingblock 5. - In addition, it is contemplated that the solution comprising the static fitting between the
valve element 4 and the holdingblock 5 can be combined with the solution comprising the dynamic fitting between thevalve element 4 and thevalve seating surface 3 to prevent the rotation of thevalve element 4 around the transverse central axes. For example, in the embodiment shown inFigure 15 , a first portion of thevalve element 4 which fits in the holdingblock 5 is in the form of a truncated cone (similar to that shown inFigure 11 ), and a second portion exposed from the holdingblock 5 has a main body in the form of substantial cylinder with a front peripheral portion formed as aconical portion 4a (similar to that shown inFigure 13 ). In this way, the ability of thevalve element 4 rotating around any transverse central axis is eliminated by means of the static fitting between the first portion of thevalve element 4 and the holdingblock 5, and thevalve element 4 is given the automatic centering ability thanks for the fitting between the second portion of thevalve element 4 and thevalve seating surface 3, so thevalve element 4 is additionally prevented from rotating around any transverse central axis. Other combined fitting solution can also be contemplated. - It can be seen that the
valve element 4 possesses the ability of rotating around the longitudinal central axis (which provides flexibility in the assemble and operation of the control valve) by forming thevalve element 4 as a solid of revolution with the longitudinal central axis Z as its revolution axis, but thevalve element 4 has a non-circular section in any longitudinal plane that passes through the longitudinal central axis Z. In addition, by means of the fitting (static fitting) between thevalve element 4 and the holdingblock 5 and/or the fitting (dynamic fitting) between thevalve element 4 and thevalve seating surface 3, the rotation of thevalve element 4 around any transverse central axis is prevented. As a result, the portion of thevalve element 4 that faces towards thevalve hole 2 is maintained to be not misplaced in any transverse direction and thus cannot moves to a position facing thevalve seating surface 3. Even if erosion is formed on the portion of thevalve element 4 that faces towards thevalve hole 2 by fuel impaction, thevalve element 4 always effectively guarantee that the valve hole 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. - Although the disclosure has been described above with reference to some preferred embodiments, the disclosure is not limited to the described details. Various modifications to the details can be made without departing from the scope of the invention as defined in the claims.
Claims (6)
- A control valve used in a fuel injector, comprising:a valve seat (1) defining a valve seating surface (3) and a valve hole (2) extending through the center portion of the valve seating surface (3) in a longitudinal direction, the valve hole (2) and the valve seating surface (3) defining a longitudinal central axis (Z), and the valve hole (2) being in communication with an injection valve of the fuel injector;a valve element (4) configured to be moved between a closed position and an opened position along the longitudinal central axis (Z), the valve element (4) being in contact and fitting with the valve seat (1) in the closed position to close the valve hole (2), and the valve element (4) being moved away from the valve seat (1) in the opened position to open the valve hole (2); anda holding block (5) having an accommodating recess for holding the valve element (4);wherein the valve element (4) is in the form of a solid of revolution, with the longitudinal central axis (Z) being the revolution axis of the solid of revolution, and the solid of revolution having a non-circular section in a longitudinal plane in which the longitudinal central axis (Z) lies so that the valve element (4) is able to rotate around the longitudinal central axis (Z) but cannot rotate around any transverse central axis which is perpendicular to the longitudinal central axis (Z),wherein the valve element (4) comprises a first portion received in the accommodating recess and a second portion exposed from the holding block (5), and the valve element (4) is able to rotate around the longitudinal central axis (Z) by means of form fitting between the first portion and the accommodating recess, characterized in that, by means of form fitting between the second portion and the valve seating surface (3), the valve element (4) is unable to rotate around any transverse central axis (X, Y) that is perpendicular to the longitudinal central axis (Z).
- The control valve of claim 1, further comprising a biasing mechanism configured for selectively applying a pushing force to the holding block (5) so that the valve element (4) is moved towards the closed position under the action of the holding block (5).
- The control valve of claim 2, further comprising a returning mechanism configured for forcing the biasing mechanism to move towards its home location in a direction opposite to its pushing force applying direction.
- The control valve of claim 2 or 3, wherein the valve element (4) is pushed to the opened position from the closed position under the action of high pressure fuel introduced from an injection valve cavity via the valve hole (2).
- A fuel injector, in particular a common rail type fuel injector, comprising:a control valve of any one of claims 1-4; andan injection valve assembled to be in combination with the control valve;wherein the injection valve performs fuel injection in responsive to the opened/closed state of the control valve.
- The fuel injector of claim 5, wherein the injection valve comprises an injection valve cavity and a valve needle disposed in the injection valve cavity; and
wherein when the valve element (4) of the control valve is in the opened position, a portion of high pressure fuel contained in the injection valve cavity flows into the control valve via the valve hole (2) of the control valve so that a pressure difference appears between front and back sides of the valve needle, and the valve needle moves backwards because of the pressure difference to open the injection valve so that a fuel injection action is performed.
Applications Claiming Priority (1)
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CN201510387784.2A CN106321307B (en) | 2015-07-03 | 2015-07-03 | Fuel injector and control valve therefor |
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EP3112663A1 EP3112663A1 (en) | 2017-01-04 |
EP3112663B1 true EP3112663B1 (en) | 2018-09-12 |
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EP16170837.5A Active EP3112663B1 (en) | 2015-07-03 | 2016-05-23 | Fuel injector and control valve thereof |
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EP (1) | EP3112663B1 (en) |
JP (1) | JP6824645B2 (en) |
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DE102022211537A1 (en) * | 2022-10-31 | 2024-05-02 | Robert Bosch Gesellschaft mit beschränkter Haftung | Proportional control valve for controlling a gaseous fuel in a fuel supply system of an internal combustion engine, pressure control unit and fuel supply system |
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JP3584554B2 (en) * | 1995-07-26 | 2004-11-04 | 株式会社デンソー | Accumulation type fuel injection device |
JP2002364483A (en) * | 2001-06-07 | 2002-12-18 | Denso Corp | Fuel injection system |
DE102004049288A1 (en) * | 2004-10-09 | 2006-04-20 | Robert Bosch Gmbh | Fuel injector with molded valve seat to reduce the anchor stroke |
JP2006291856A (en) * | 2005-04-12 | 2006-10-26 | Denso Corp | Fuel injection valve |
JP2008175085A (en) * | 2007-01-16 | 2008-07-31 | Denso Corp | Pressure limiter of fuel injection system |
JP2009030563A (en) * | 2007-07-30 | 2009-02-12 | Denso Corp | Injector |
DE102008001597A1 (en) * | 2008-05-06 | 2009-11-12 | Robert Bosch Gmbh | Fuel injector |
DE102008041362A1 (en) * | 2008-08-20 | 2010-02-25 | Robert Bosch Gmbh | Fuel supplying device for internal combustion engine in motor vehicle, has dosing valve and pressure control valve comprising closing members, which are connected together in rigid manner and are movable on corresponding movement axis |
FR2973092B1 (en) * | 2011-03-25 | 2016-09-02 | Bosch Gmbh Robert | SHUTTERING DEVICE, PRESSURE REGULATOR COMPRISING SUCH A DEVICE, DIESEL INJECTION DEVICE COMPRISING SUCH A REGULATOR, DIESEL ENGINE AND VEHICLE COMPRISING SUCH AN ENGINE |
-
2015
- 2015-07-03 CN CN201510387784.2A patent/CN106321307B/en active Active
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2016
- 2016-05-23 EP EP16170837.5A patent/EP3112663B1/en active Active
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CN106321307B (en) | 2020-03-06 |
JP2017040254A (en) | 2017-02-23 |
JP6824645B2 (en) | 2021-02-03 |
EP3112663A1 (en) | 2017-01-04 |
CN106321307A (en) | 2017-01-11 |
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