EP3194756A1 - Fuel injector - Google Patents

Fuel injector

Info

Publication number
EP3194756A1
EP3194756A1 EP15759409.4A EP15759409A EP3194756A1 EP 3194756 A1 EP3194756 A1 EP 3194756A1 EP 15759409 A EP15759409 A EP 15759409A EP 3194756 A1 EP3194756 A1 EP 3194756A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
pressure circuit
bore
connecting pin
low 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.)
Granted
Application number
EP15759409.4A
Other languages
German (de)
French (fr)
Other versions
EP3194756B1 (en
Inventor
Philippe Legrand
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.)
Borgwarner US Technologies LLC
Original Assignee
Delphi International Operations Luxembourg SARL
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 Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Publication of EP3194756A1 publication Critical patent/EP3194756A1/en
Application granted granted Critical
Publication of EP3194756B1 publication Critical patent/EP3194756B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering

Definitions

  • the present invention relates to a fuel injector, and more specifically to a separating assembly for separating high and low pressure circuits in a fuel injector.
  • Examples of currently known fuel injectors such as diesel injectors, comprise an actuator which transfers a mechanical or hydraulic force to an amplifier/inverter assembly, via a connecting pin.
  • An example of a currently known fuel injector 2 as illustrated in Figure 1, comprises a high pressure circuit including a high pressure fuel supply line 6, and a low pressure circuit including a low pressure return line 14.
  • An amplifier/inverter assembly 18 and nozzle needle 46 are located in the high pressure circuit, and an actuator 16 assembly is located in the low pressure circuit.
  • the high pressure circuit and the low pressure circuit are separated by a separating member 20 through which a through bore 28 is provided.
  • a connecting pin 36 passes through the through bore 28 in the separating member 20, to allow force to be transmitted to the amplifier/inverter assembly 18.
  • the actuator 16 can selectively apply a force to the inverter/amplifier assembly 18, via the connecting pin 36, to initiate an injection event.
  • the through bore 28 through which the connecting pin 36 passes can allow leakage between the high and low pressure circuits, resulting in a reduction of efficiency of the whole system, and furthermore in a C0 2 loss.
  • Two particular known injectors show a leakage of 1 lml/min at 2000 bar, and lOml/min at 2500 bar. Fuel injectors are being run at increasingly high pressures to reduce emissions (for example up to 3000 bar). Higher pressures lead to increased leakage around the connecting pin.
  • the present invention comprises a fuel injector comprising a high pressure circuit, a low pressure circuit, an actuator located within the low pressure circuit, and an inverter/amplifier assembly located within the high pressure circuit and coupled to a nozzle needle; wherein the high pressure circuit and the low pressure circuit are separated by a separating assembly comprising a separating member and a connecting pin located in a through bore of the separating member, the connecting pin being coupled to the actuator and to the inverter/amplifier assembly; wherein the actuator is arranged to selectively apply a force to the inverter/amplifier assembly, via the connecting pin, thereby to initiate an injection event; wherein the separating assembly further comprises a sleeve located around part of the connecting pin, such that the through bore and the connecting pin are separated by the sleeve, the connecting pin being movable within the sleeve.
  • the sleeve and separating member may be integrally formed.
  • the sleeve and separating member may be separate components, wherein movement of the sleeve through the through bore and towards the low pressure circuit, is limited by a restraining means.
  • a first shoulder surface may be provided on a projection of the sleeve, and a second shoulder surface is provided at a junction of a first through bore section remote from the low pressure circuit and a second through bore section between the first through bore section and the low pressure circuit, the second through bore section being of a smaller diameter than the first through bore section, such that the first shoulder surface is arranged for complementary abutment with the second shoulder surface thereby providing the restraining means.
  • the restraining means could comprise a welded joint between an external surface of the sleeve and the through bore of the separating member.
  • the present invention comprises a separating assembly as described above.
  • Figure 2 is a schematic representation, partially in cross-section, of a nozzle in accordance with the present invention.
  • Figure 3 is a cross-sectional view of the separating assembly of the nozzle of Figure 2;
  • Figure 4 is a detailed cross-sectional view of the nozzle of Figure 3, at the area indicated on Figure 3; and
  • Figure 5 is a cross-sectional view an alternative separating assembly in accordance with the present invention.
  • an injector 102 according to a first embodiment of the present invention comprises a high pressure circuit and a low pressure circuit.
  • the high pressure circuit comprises a high pressure supply line 106 and a high pressure chamber 108 for supplying high pressure fuel to a nozzle 110 of the injector 102.
  • the low pressure circuit comprises a low pressure chamber 112 and a low pressure return line 114.
  • the injector 102 further comprises an actuator 116 located in the low pressure circuit, an inverter/amplifier assembly 118 located in the high pressure circuit, and a separating assembly which separates the high pressure circuit and the low pressure circuit.
  • the separating assembly comprises a separating member 120, a connecting pin 136 and a drilled sleeve 138.
  • the separating member 120 includes a wall section 122, and a flange section 124 in which is defined a recess 126 (wall section 122, flange section 124 and recess 126 are indicated on Figure 3).
  • the separating member 120 is arranged in the injector 102 such that the recess 126 forms part of the high pressure circuit, i.e. the recess 126 is subject to high fuel pressure of the high pressure circuit.
  • the wall section 122 of the separating member 120 is provided with a through bore 128, which comprises a first section 130, and a second section 132 which is of reduced cross-sectional area relative to that of the first section 130.
  • a shoulder surface 134 At the junction of the first section 130 and the second section 132 is formed a shoulder surface 134. (Sections 130, 132 and shoulder surface 134 are indicated on Figure 4).
  • the connecting pin 136 and sleeve 138 are located in the through bore 128 of the wall section 122 of the separating member 120.
  • the length of the connecting pin 136 is greater than the length of the through bore 128, and the connecting pin 136 is arranged such that the part of the pin 136 projects from either end of the through bore 128. Accordingly, part of the connecting pin 136 projects into the low pressure circuit, and part projects into the high pressure circuit.
  • the actuator 116 is coupled to the part of the connecting pin 136 which projects into the low pressure circuit.
  • the sleeve 138 is located around part of the connecting pin 136, such that the connecting pin 136 is separated from the though bore 128 by the sleeve 138.
  • nominal diameters of the internal bore of the sleeve 138, and the diameter of the connecting pin 136 are selected such that an initial clearance is provided between an internal surface 140 of the sleeve 138, and an external surface 142 of the pin 136, such that the pin 136 is moveable within the sleeve 138.
  • the sub-assembly comprising the sleeve 138 and connecting pin 136 is inserted in a press fit into the through bore 128.
  • the sleeve 138 is provided with a protrusion 152, which provides a shoulder surface 144.
  • the diameter of the sleeve 138 at the area of the protrusion 152 is between the diameter of the first and second sections 130, 132 of the through bore 128 of the separating member 120.
  • High pressure fuel within the recess 126 of the separating member 120 causes an axial pressure force upon the sleeve 138.
  • the shoulder surface 144 of the sleeve 138 is thereby urged against the shoulder surface 134 of the through bore 128 of the separating member 120.
  • Complementary abutment of the shoulder surface 144 of the sleeve 138 and the shoulder surface 134 of the through bore thereby provides a restraining means, to limit the upward movement (in the orientation of the figures) of the sleeve 138, i.e. limiting movement of the sleeve 138 in an axial direction through the through bore 128 towards the low pressure circuit, and improving sealing between the high pressure circuit and the low pressure circuit.
  • a hydraulic or mechanical force is provided to the connecting pin 136; this force is transferred to the inverter/amplifier assembly 118, via the connecting pin 136.
  • a needle 146 of the nozzle 110 is coupled to inverter/amplifier assembly 118; force transferred to the needle 146 drives an injection event.
  • High pressure fuel within the recess 126 of the separating member 120 also exerts radial pressure upon external circumferential surfaces 150, 160 of the sleeve 138.
  • This radial pressure generally indicated in Figure 4 by arrows acting upon external surfaces 150, 160, provides an inward radial force, tending to cause a reduction in internal diameter of the sleeve 138 in the areas in which the radial force is applied.
  • a small amount of fluid flow is enabled in the initial clearance provided between the internal surface 140 of the sleeve 138 and external surface 142 of the pin 136.
  • This fluid flow exerts an outward pressure on the internal surface 140 of the sleeve 138; this outward pressure is indicated generally in Figure 4 by arrows acting upon the internal surface 140 of the sleeve 138).
  • the outward pressure on the sleeve 138 as described above is applied over a smaller area than the inward pressure. Furthermore, the outward pressure exerted on the internal surface 140 of the sleeve 138 will decrease, for example in a linear manner, along the fuel flow path, i.e. will decrease from the recess 126 of the separating member 120 towards the low pressure circuit side of the separating member 120.
  • a net inward force is applied to the sleeve 138 by the high pressure fuel in the recess 126. Accordingly, the diameter of the sleeve 138 will decrease, and the clearance between the sleeve 138 and the connecting pin 136 will decrease, thereby reducing leakage of fuel between the high pressure circuit and the low pressure circuit.
  • the initial clearance between the sleeve 138 and the connecting pin 136, and the size and thickness of the sleeve 138, are selected according to the decrease in diameter of the sleeve which occurs at high pressure, to prevent the sleeve 138 and pin 136 from sticking together at high pressure.
  • any leakage between the high and low pressure circuits around the connecting pin 136 is minimised, for example the present invention could result in leakage being reduced to 2 to 3 ml/min, even at high pressures such as 3000 bar. Furthermore, leakage around the connecting pin 136 is almost independent of fuel pressure.
  • the sleeve 138' may be welded, for example by laser welding, into the through bore 128 of the separating member 120. (Welding may be used, and the welding may be addition to, or instead of, a press fit between the sleeve 138' and through bore 128).
  • a separating assembly comprising a separating member 120, sleeve 138' and connecting pin 136 in accordance with this alternative embodiment is illustrated in Figure 5.
  • the sleeve 138' is welded to second, reduced diameter section of the through bore 128. Due to the weld between the sleeve 138 and the through bore 128, it is not necessary to provide a protrusion on the sleeve 138' of this embodiment; the restraining means, to prevent upward movement of the sleeve 138' in an axial direction toward the low pressure circuit, is provided by the welded joint. Axial pressure acting on the sleeve 138' from high pressure fluid in the recess 126 of the separation member 120 is counteracted by the strength of the welded joint (and potentially a press fit) between the sleeve 138' and through bore 128.
  • the sleeve could be integrally formed with the separating member, e.g. machined from the bare material form which the separating member is formed, thereby avoiding the requirement for restraining means.
  • the actuator 116 may comprise any suitable actuator, for example a direct acting Piezo actuator.

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

In a diesel fuel injection nozzle, a separating assembly which separates high and low pressure circuits comprises a member having a through bore, in which a connecting pin is located to transfer hydraulic/mechanical force on energisation of an actuator, to a nozzle needle, via an inverter/amplifier assembly, wherein a sleeve is provided around the pin, such that radial forces from high pressure fuel act upon the sleeve, thereby reducing a pre-determined clearance between the pin and sleeve, thereby reducing leakage of fuel between the high and low pressure circuits via the separating assembly.

Description

Fuel Injector TECHNICAL FIELD
The present invention relates to a fuel injector, and more specifically to a separating assembly for separating high and low pressure circuits in a fuel injector.
BACKGROUND OF THE TNVENTION
Examples of currently known fuel injectors, such as diesel injectors, comprise an actuator which transfers a mechanical or hydraulic force to an amplifier/inverter assembly, via a connecting pin.
An example of a currently known fuel injector 2 as illustrated in Figure 1, comprises a high pressure circuit including a high pressure fuel supply line 6, and a low pressure circuit including a low pressure return line 14. An amplifier/inverter assembly 18 and nozzle needle 46 are located in the high pressure circuit, and an actuator 16 assembly is located in the low pressure circuit. The high pressure circuit and the low pressure circuit are separated by a separating member 20 through which a through bore 28 is provided. A connecting pin 36 passes through the through bore 28 in the separating member 20, to allow force to be transmitted to the amplifier/inverter assembly 18. Thereby the actuator 16 can selectively apply a force to the inverter/amplifier assembly 18, via the connecting pin 36, to initiate an injection event. The through bore 28 through which the connecting pin 36 passes can allow leakage between the high and low pressure circuits, resulting in a reduction of efficiency of the whole system, and furthermore in a C02 loss.
Two particular known injectors show a leakage of 1 lml/min at 2000 bar, and lOml/min at 2500 bar. Fuel injectors are being run at increasingly high pressures to reduce emissions (for example up to 3000 bar). Higher pressures lead to increased leakage around the connecting pin.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved fuel injector which at least mitigates the problems as described above.
Accordingly, in a first aspect, the present invention comprises a fuel injector comprising a high pressure circuit, a low pressure circuit, an actuator located within the low pressure circuit, and an inverter/amplifier assembly located within the high pressure circuit and coupled to a nozzle needle; wherein the high pressure circuit and the low pressure circuit are separated by a separating assembly comprising a separating member and a connecting pin located in a through bore of the separating member, the connecting pin being coupled to the actuator and to the inverter/amplifier assembly; wherein the actuator is arranged to selectively apply a force to the inverter/amplifier assembly, via the connecting pin, thereby to initiate an injection event; wherein the separating assembly further comprises a sleeve located around part of the connecting pin, such that the through bore and the connecting pin are separated by the sleeve, the connecting pin being movable within the sleeve.
The sleeve and separating member may be integrally formed. Alternatively, the sleeve and separating member may be separate components, wherein movement of the sleeve through the through bore and towards the low pressure circuit, is limited by a restraining means.
A first shoulder surface may be provided on a projection of the sleeve, and a second shoulder surface is provided at a junction of a first through bore section remote from the low pressure circuit and a second through bore section between the first through bore section and the low pressure circuit, the second through bore section being of a smaller diameter than the first through bore section, such that the first shoulder surface is arranged for complementary abutment with the second shoulder surface thereby providing the restraining means.
Alternatively, the restraining means could comprise a welded joint between an external surface of the sleeve and the through bore of the separating member.
In a further aspect, the present invention comprises a separating assembly as described above.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which:
Figure 2 is a schematic representation, partially in cross-section, of a nozzle in accordance with the present invention;
Figure 3 is a cross-sectional view of the separating assembly of the nozzle of Figure 2; Figure 4 is a detailed cross-sectional view of the nozzle of Figure 3, at the area indicated on Figure 3; and Figure 5 is a cross-sectional view an alternative separating assembly in accordance with the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to Figures 2 to 4, an injector 102 according to a first embodiment of the present invention comprises a high pressure circuit and a low pressure circuit.
The high pressure circuit comprises a high pressure supply line 106 and a high pressure chamber 108 for supplying high pressure fuel to a nozzle 110 of the injector 102. The low pressure circuit comprises a low pressure chamber 112 and a low pressure return line 114.
The injector 102 further comprises an actuator 116 located in the low pressure circuit, an inverter/amplifier assembly 118 located in the high pressure circuit, and a separating assembly which separates the high pressure circuit and the low pressure circuit.
The separating assembly comprises a separating member 120, a connecting pin 136 and a drilled sleeve 138. The separating member 120 includes a wall section 122, and a flange section 124 in which is defined a recess 126 (wall section 122, flange section 124 and recess 126 are indicated on Figure 3). The separating member 120 is arranged in the injector 102 such that the recess 126 forms part of the high pressure circuit, i.e. the recess 126 is subject to high fuel pressure of the high pressure circuit. The wall section 122 of the separating member 120 is provided with a through bore 128, which comprises a first section 130, and a second section 132 which is of reduced cross-sectional area relative to that of the first section 130. At the junction of the first section 130 and the second section 132 is formed a shoulder surface 134. (Sections 130, 132 and shoulder surface 134 are indicated on Figure 4).
The connecting pin 136 and sleeve 138 are located in the through bore 128 of the wall section 122 of the separating member 120. The length of the connecting pin 136 is greater than the length of the through bore 128, and the connecting pin 136 is arranged such that the part of the pin 136 projects from either end of the through bore 128. Accordingly, part of the connecting pin 136 projects into the low pressure circuit, and part projects into the high pressure circuit. The actuator 116 is coupled to the part of the connecting pin 136 which projects into the low pressure circuit.
The sleeve 138 is located around part of the connecting pin 136, such that the connecting pin 136 is separated from the though bore 128 by the sleeve 138. During manufacturing of the sleeve 138 and connecting pin 136, nominal diameters of the internal bore of the sleeve 138, and the diameter of the connecting pin 136, are selected such that an initial clearance is provided between an internal surface 140 of the sleeve 138, and an external surface 142 of the pin 136, such that the pin 136 is moveable within the sleeve 138.
The sub-assembly comprising the sleeve 138 and connecting pin 136 is inserted in a press fit into the through bore 128.
The sleeve 138 is provided with a protrusion 152, which provides a shoulder surface 144. The diameter of the sleeve 138 at the area of the protrusion 152 is between the diameter of the first and second sections 130, 132 of the through bore 128 of the separating member 120.
High pressure fuel within the recess 126 of the separating member 120 causes an axial pressure force upon the sleeve 138. The shoulder surface 144 of the sleeve 138 is thereby urged against the shoulder surface 134 of the through bore 128 of the separating member 120. Complementary abutment of the shoulder surface 144 of the sleeve 138 and the shoulder surface 134 of the through bore thereby provides a restraining means, to limit the upward movement (in the orientation of the figures) of the sleeve 138, i.e. limiting movement of the sleeve 138 in an axial direction through the through bore 128 towards the low pressure circuit, and improving sealing between the high pressure circuit and the low pressure circuit. When the actuator 116 is energised, a hydraulic or mechanical force is provided to the connecting pin 136; this force is transferred to the inverter/amplifier assembly 118, via the connecting pin 136. A needle 146 of the nozzle 110 is coupled to inverter/amplifier assembly 118; force transferred to the needle 146 drives an injection event.
High pressure fuel within the recess 126 of the separating member 120 also exerts radial pressure upon external circumferential surfaces 150, 160 of the sleeve 138. This radial pressure, generally indicated in Figure 4 by arrows acting upon external surfaces 150, 160, provides an inward radial force, tending to cause a reduction in internal diameter of the sleeve 138 in the areas in which the radial force is applied. A small amount of fluid flow is enabled in the initial clearance provided between the internal surface 140 of the sleeve 138 and external surface 142 of the pin 136. This fluid flow exerts an outward pressure on the internal surface 140 of the sleeve 138; this outward pressure is indicated generally in Figure 4 by arrows acting upon the internal surface 140 of the sleeve 138).
As the circumferential area of the external surfaces 140 of the sleeve 138 is greater than that of the internal surface 140, the outward pressure on the sleeve 138 as described above is applied over a smaller area than the inward pressure. Furthermore, the outward pressure exerted on the internal surface 140 of the sleeve 138 will decrease, for example in a linear manner, along the fuel flow path, i.e. will decrease from the recess 126 of the separating member 120 towards the low pressure circuit side of the separating member 120.
Accordingly, a net inward force is applied to the sleeve 138 by the high pressure fuel in the recess 126. Accordingly, the diameter of the sleeve 138 will decrease, and the clearance between the sleeve 138 and the connecting pin 136 will decrease, thereby reducing leakage of fuel between the high pressure circuit and the low pressure circuit. The initial clearance between the sleeve 138 and the connecting pin 136, and the size and thickness of the sleeve 138, are selected according to the decrease in diameter of the sleeve which occurs at high pressure, to prevent the sleeve 138 and pin 136 from sticking together at high pressure.
In present invention, any leakage between the high and low pressure circuits around the connecting pin 136 is minimised, for example the present invention could result in leakage being reduced to 2 to 3 ml/min, even at high pressures such as 3000 bar. Furthermore, leakage around the connecting pin 136 is almost independent of fuel pressure.
In an alternative embodiment of the present invention, the sleeve 138' may be welded, for example by laser welding, into the through bore 128 of the separating member 120. (Welding may be used, and the welding may be addition to, or instead of, a press fit between the sleeve 138' and through bore 128). A separating assembly comprising a separating member 120, sleeve 138' and connecting pin 136 in accordance with this alternative embodiment is illustrated in Figure 5.
The sleeve 138' is welded to second, reduced diameter section of the through bore 128. Due to the weld between the sleeve 138 and the through bore 128, it is not necessary to provide a protrusion on the sleeve 138' of this embodiment; the restraining means, to prevent upward movement of the sleeve 138' in an axial direction toward the low pressure circuit, is provided by the welded joint. Axial pressure acting on the sleeve 138' from high pressure fluid in the recess 126 of the separation member 120 is counteracted by the strength of the welded joint (and potentially a press fit) between the sleeve 138' and through bore 128.
The alternative embodiment of Figure 5 works on the same principal, as the first embodiment as described above, i.e. reduction of diameter of the sleeve 138' is caused on application of radial force to the external and internal surfaces of the sleeve 138' by high pressure fuel; clearance between the sleeve 138' and pin 136, and leakage between the high and low pressure circuits, is thereby reduced.
In a further alternative embodiment, the sleeve could be integrally formed with the separating member, e.g. machined from the bare material form which the separating member is formed, thereby avoiding the requirement for restraining means.
In the injector of the present invention, the actuator 116 may comprise any suitable actuator, for example a direct acting Piezo actuator.
REFERENCES injector 102
high pressure supply line 106
high pressure chamber 108
nozzle 1 10
low pressure chamber 1 12
low pressure return line 114
actuator 116
inverter/amplifier assembly 1 18
separating member 120
separating member wall section 122
separating member flange section 124 recess 126
separating member through bore 128 through bore first section 130
through bore second section 132
through bore shoulder surface 134
connecting pin 136
sleeve 138, 138'
sleeve internal surface 140
connecting pin external surface 142
sleeve shoulder surface 144
needle 146
sleeve circumferential external surfaces 150, 160 sleeve protrusion 152

Claims

A fuel injector comprising a high pressure circuit, a low pressure circuit, an actuator located within the low pressure circuit, and an inverter/amplifier assembly located within the high pressure circuit and coupled to a nozzle needle;
wherein the high pressure circuit and the low pressure circuit are separated by a separating assembly comprising a separating member and a connecting pin located in a through bore of the separating member, the connecting pin being coupled to the actuator and to the inverter/amplifier assembly;
wherein the actuator is arranged to selectively apply a force to the inverter/amplifier assembly, via the connecting pin, thereby to initiate an injection event;
wherein the separating assembly further comprises a sleeve located around part of the connecting pin, such that the through bore and the connecting pin are separated by the sleeve, the connecting pin being movable within the sleeve.
A fuel injector as claimed in claim 1 wherein the sleeve and separating member are integrally formed.
A fuel injector as claimed in claim 1 wherein the sleeve and separating member are separate components, and wherein movement of the sleeve through the through bore and towards the low pressure circuit, is limited by a restraining means.
A fuel injector as claimed in claim 3, wherein a first shoulder surface is provided on a projection of the sleeve, and a second shoulder surface is provided at a junction of a first through bore section remote from the low pressure circuit and a second through bore section between the first through bore section and the low pressure circuit, the second through bore section being of a smaller diameter than the first through bore section,
and wherein the first shoulder surface is arranged for complementary abutment with the second shoulder surface thereby providing the restraining means.
A fuel injector as claimed in claim 3, wherein the restraining means comprises a welded joint between an external surface of the sleeve and the through bore of the separating member.
A separating assembly as claimed in any one of the preceding claims.
EP15759409.4A 2014-09-03 2015-08-18 Fuel injector Active EP3194756B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1415539.4A GB201415539D0 (en) 2014-09-03 2014-09-03 Fuel injector
PCT/EP2015/068902 WO2016034396A1 (en) 2014-09-03 2015-08-18 Fuel injector

Publications (2)

Publication Number Publication Date
EP3194756A1 true EP3194756A1 (en) 2017-07-26
EP3194756B1 EP3194756B1 (en) 2021-10-06

Family

ID=51752507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15759409.4A Active EP3194756B1 (en) 2014-09-03 2015-08-18 Fuel injector

Country Status (3)

Country Link
EP (1) EP3194756B1 (en)
GB (1) GB201415539D0 (en)
WO (1) WO2016034396A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5361053A (en) * 1993-10-07 1994-11-01 Unisia Jecs Corporation Super magnetostriction type actuator
DE19756669A1 (en) * 1997-07-02 1999-01-07 Bosch Gmbh Robert Valve for controlling liquids
DE19956830C2 (en) * 1999-11-25 2002-07-18 Siemens Ag execution
DE10347769B3 (en) * 2003-10-14 2005-01-13 Siemens Ag Final control device has 2 pistons in common cylindrical body coupled by hydraulic volume in cylinder so axial deflection of first piston is converted into opposite axial deflection of second piston
DE102007025050B3 (en) * 2007-05-29 2008-10-16 L'orange Gmbh High-pressure injection injector for internal combustion engines with a kinkload-increasing control rod support over high-pressure fuel
US8201543B2 (en) * 2009-05-14 2012-06-19 Cummins Intellectual Properties, Inc. Piezoelectric direct acting fuel injector with hydraulic link
DE102010039116A1 (en) * 2010-08-10 2012-02-16 Robert Bosch Gmbh Fuel injector, particularly for combustion engine in motor vehicle, has injector housing, which has through-opening for supplying fuel into combustion chamber of combustion engine
DE102012211233A1 (en) * 2012-06-29 2014-01-02 Robert Bosch Gmbh Fuel injection valve for fuel injection system of internal combustion engine, has actuator that affects mechanical translator over hydraulic temperature equalizing device when translating stroke of actuator into stroke of nozzle needle
DE102012219867A1 (en) * 2012-10-30 2014-04-30 Robert Bosch Gmbh Fuel injector with piezo actuator

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2016034396A1 *

Also Published As

Publication number Publication date
GB201415539D0 (en) 2014-10-15
EP3194756B1 (en) 2021-10-06
WO2016034396A1 (en) 2016-03-10

Similar Documents

Publication Publication Date Title
CN101180464B (en) High pressure piston pump for fuel jet device of the internal combustion engine
KR102179623B1 (en) Fuel injection system comprising a fuel-guiding component, a fuel injection valve and a mounting
KR101489133B1 (en) Inlet connector
US10502170B2 (en) Fuel injector
CN101501323A (en) Injector for a fuel injection system
CN108138725B (en) High-pressure fuel supply pump, method for manufacturing the same, and method for combining two components
JP2018534483A (en) Flow restrictor for injector
KR102048190B1 (en) Fuel injection valve
CN108779748B (en) Flow rate control device
EP3194756B1 (en) Fuel injector
CN107667216B (en) High-pressure connection device, high-pressure fuel pump and method for manufacturing a high-pressure connection device for a high-pressure fuel pump
KR101960201B1 (en) Terminal sealing structure for fuel rail for gasoline direct-injection engine
US10495040B2 (en) Control valve assembly
CN105927439B (en) Electronic control high-pressure oil injector with magnetic and hydraulic devices fixed separately
JP2017531128A (en) Control valve for fuel injector
CN111971472B (en) Component of flow rate control device and fuel injection valve
CN115066549B (en) Fuel Injectors
JP2012136992A (en) Injector
JP5785892B2 (en) Fuel injection valve
KR102164183B1 (en) Integrated arrangement of a high-pressure valve and an injection ramp
WO2019068566A1 (en) Fuel injector
WO2019225069A1 (en) Fuel pump
KR20190015395A (en) Fuel injector with solenoid valve and solenoid valve
GB2539401A (en) Hydraulic lash adjuster arranged in a servo injector

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170403

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: DELPHI TECHNOLOGIES IP LIMITED

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20190503

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20210601

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: AT

Ref legal event code: REF

Ref document number: 1436437

Country of ref document: AT

Kind code of ref document: T

Effective date: 20211015

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602015073917

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20211006

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1436437

Country of ref document: AT

Kind code of ref document: T

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220106

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220206

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220207

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220106

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220107

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602015073917

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20220707

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220818

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220831

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220831

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20220831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230327

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220818

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20220831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20150818

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 602015073917

Country of ref document: DE

Owner name: PHINIA DELPHI LUXEMBOURG SARL, LU

Free format text: FORMER OWNER: DELPHI TECHNOLOGIES IP LIMITED, ST. MICHAEL, BB

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

Free format text: REGISTERED BETWEEN 20240725 AND 20240731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20250709

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20250710

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20250709

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211006