EP3431747A1 - Control valve arrangement - Google Patents
Control valve arrangement Download PDFInfo
- Publication number
- EP3431747A1 EP3431747A1 EP18188428.9A EP18188428A EP3431747A1 EP 3431747 A1 EP3431747 A1 EP 3431747A1 EP 18188428 A EP18188428 A EP 18188428A EP 3431747 A1 EP3431747 A1 EP 3431747A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- face
- recess
- deflector
- armature
- spool
- 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
Links
- 239000000446 fuel Substances 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 210000002105 tongue Anatomy 0.000 claims description 16
- 125000006850 spacer group Chemical group 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000116 mitigating effect 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
-
- 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
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
- F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
- F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
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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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/002—Arrangement of leakage or drain conduits in or from injectors
-
- 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
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic 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
- 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
- F02M63/0073—Pressure balanced valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
-
- 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
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
- F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
Definitions
- the present invention relates generally to a fuel injector and more particularly to a control valve arrangement.
- a control valve indirectly controls the motions of a valve member, also identified as a needle in reference to its elongated shape, by opening and closing an outlet conduit enabling fuel at high pressure to exit a control chamber which internal pressure solicits the needle.
- the control valve comprises a body provided with a hydraulic bore opening in a recess and with a magnetic armature-and-valve-spool-assembly.
- the spool is slidably arranged in the bore while the disc-shape armature displaces in the recess as a function of a magnetic field generated by a controlled solenoid.
- the spool and body further define a valve seat which opens or closes when said assembly translates. When the seat opens, fuel at high pressure exiting the control chamber flows through the open passageway and hits the under face of the disc-shape armature when entering the recess. This violent impact disrupts the travel of the armature-and-spool-assembly and the functioning of the control valve.
- a control valve assembly for a fuel injector comprising a cylindrical body and, an armature-spool assembly adapted to translate within the body.
- the body extends from a first, or upper, face to an opposed second, or lower, face, and is provided with a large recess opening in the first face and also with a hydraulic distribution bore extending in the body along a main axis from the bottom face of the recess.
- a fixed valve seat is provided around the opening of the bore in said bottom face of the recess.
- the body is further provided with a hydraulic outlet conduit extending through the body and opening in the hydraulic bore and also with a return conduit extending from the large recess.
- the armature-spool assembly comprises a disc shape magnetic armature having an upper face opposed to an under face and a stem forming valve spool fixed to the armature and perpendicularly extending from its under face.
- the armature-spool assembly is further provided with a spool seat arranged in the vicinity of the under face the armature.
- the armature-spool assembly is arranged in the body, the spool being slidably adjusted in the hydraulic bore and the armature being moveable in the recess. Said assembly is able to translate between a closed position where the spool seat is in sealing contact against the fixed valve seat and, an open position where the spool seat is lifted away from the fixed valve seat enabling, in use, fuel to flow to enter in the recess.
- the control valve assembly is further provided with a deflector arranged in the recess, between the armature and the bottom face of the recess, the deflector being adapted to deflect away from the under face of the armature the flow of fuel entering the recess when the valve is in open position so that, the displacements of the armature-spool assembly are not disturbed by said entering flow.
- the deflector comprises a deflector face, or bottom face, provided with a central opening, said deflector face being arranged transverse to the valve axis and being pushed toward the bottom face of the recess by a pusher feature, while being maintained at a distance of the bottom face of the recess by a spacer feature.
- the pusher feature can be a cylindrical wall integral to the deflector face and erecting from the periphery of said deflector face to an upward circular edge, said cylindrical wall outwardly protruding from the recess above the level of first face of the body so that, when the control valve assembly is arranged in a fuel injector, another part of the body of the injector that comes in surface contact with the first face of the valve body downwardly biases the deflector.
- the spacer feature is arranged between the deflector face of the deflector and the bottom face of the recess and it has resilient characteristics so that said spacer feature always biases the deflector face away from the bottom face of the recess.
- the first face of the body is further provided with a plurality of notches, said notches opening in the recess.
- the deflector also comprises a transverse deflector face provided with a central opening, and with tabs radially extending from the edge of said deflector face, each tab being arranged in a notch.
- the deflector further comprises a tubular spacer ring non-integral to the deflector face, said spacer ring being placed over the deflector face and outwardly protruding from the recess above the level of first face of the body so that, when the control valve assembly is arranged in a fuel injector, another part of the body of the injector that comes in surface contact with the upper face of the valve body downwardly biases said the spacer ring and the deflector face.
- the invention also extends to a fuel injector comprising a control valve assembly as claimed in any one of the preceding claims.
- a fuel injector 10 particularly adapted to diesel fuel although the invention is also applicable to gasoline injectors.
- the injector 10 has a generally elongated body 12, the injector 10 extending along a main axis X1 from a head 14 to a nozzle assembly 22.
- the head arrangement 14, arbitrarily drawn on the top of figure 1 comprises an electric connector 16, a fuel inlet 18 and a fuel outlet 20.
- the pointy tip extremity of the nozzle assembly 22, at the extreme bottom of the figure, is provided with spray holes 24 for delivering fuel in a combustion chamber.
- the injector 10 generally comprises an actuator member 26 arranged above a control valve 28 arranged above the nozzle assembly 22. Said three main sub-assemblies are coaxially X1 fixed to each other's by an injector cap nut 30.
- the actuator member 26 comprises an actuator body 32 extending from the head 14 to a lower face 34 where opens a recess 36 upwardly extending in the body 32.
- a solenoid 38 is arranged in the recess 36 and is electrically connected to the connector 16 via electric conductors 40 upwardly extending in a specific conduit 42 opening in the upper part of the recess 36.
- a compression leaf spring 44 downwardly soliciting the solenoid 38.
- the solenoid itself is provided with an internal blind bore 46 wherein is compressed a coil spring 48.
- the control valve 28 has a valve body 50 axially X1 extending between a upper face 52 and an opposed lower face 54.
- the valve body 50 is provided with a hydraulic bore 56 axially extending along a valve axis X2 that is parallel and slightly offset with the main axis X1.
- the bore 50 upwardly opens in the bottom face 58 of a large recess 60 itself opening in the upper face 52 of the valve body 50.
- the opening of the hydraulic bore 56 in the bottom face 58 of the recess is surrounded by a conical face forming a fixed valve seat 62.
- a deflector 64 In the large recess 60 is arranged a deflector 64, a first embodiment of which being detailed on figures 2 and 3 .
- Said first embodiment of the deflector 64 is a punched metal sheet having a cup-like shape with a bottom face 66 provided with a central hole 68 and with a peripheral cylindrical wall 70 perpendicularly upwardly erecting from the circular edge of the bottom face 66 up to an upper circular edge 72.
- the deflector 64 is arranged in the large recess 60 so the central hole 68 is aligned with the hydraulic bore 56 and, the bottom face 66 of the deflector is parallel to the bottom face 58 of the recess, a leaf spring 74 being arranged between said two bottom faces 58, 66 so that, an inter-space S remains open under the deflector 64.
- any type of spring such as resilient tongues, enabling to maintain a distance between said two bottom faces 58, 66, fits the purpose.
- figures 4, 5 and 6 present different alternatives of spring 74 that are integral to the bottom face 66 of the deflector 64.
- the springs 74 are provided by partially cutting said bottom face 66 in order to form tongues 75 that are outwardly bent around a non-cut edge, said bending providing resilient characteristics to the tongue 75.
- the embodiment of figure 4 comprises three rectangular tongues 75 each being cut on three sides and slightly bent on the fourth. To provide stability when arranged in the large recess 60, the tongues 75 are arranged every 120° relative to the valve axis X2.
- the embodiment of figure 5 comprises six rectangular tongues 75 arranged by pair of face to face tongues that are cut along their common length and a common width.
- the tongues 75 are bent about their non-cut width.
- the pair of tongues 75 are arranged every 120° relative to the valve axis X2.
- the embodiment of figure 6 comprises three tongues 75 each forming a circular segment.
- the cut is operated along the circular edge of the bottom face 58 and the binding is done along the chord of said segment.
- the tongues 75 are arranged every 120° relative to the valve axis X2.
- the tongues 75 are arranged every 120° while other embodiments of four or more tongues arranged every 90° or less is also possible.
- control valve 28 is provided with an armature-spool assembly 76 comprising a magnetic disc-shape armature 78 and a stem-like cylindrical spool 80.
- the spool 80 downwardly axially X2 extends from an upper end that is inserted and crimped in a central orifice of the armature 78, the top face 82 of said upper end slightly protruding above the armature 78.
- the spool 80 is provided with a plurality of cylindrical portions of different diameters and, just below the armature 80, with a conical face forming a spool seat 84.
- the spool 80 When arranged in the valve body 50, as shown on figure 2 , the spool 80 is slidably adjusted in the hydraulic bore 56, the spool seat 84 cooperates with the fixed valve seat 62 and, the spool extends through the central hole 68 of the deflector 64 for the armature 78 to be inside the cup-like deflector 64.
- the nozzle assembly 22 has a body 86 which extends from an upper face 88 down to the tip provided with the spray holes 24.
- the body 86 is provided with an axial valve bore 90 in which is slidably arrange a valve member 92, also known as a needle valve in reference to its elongated shape.
- Said member 92 extends from a needle head protruding in a control chamber 94, close to the upper face 88, down to a pointy tip that forms another valve seat cooperating with the spray holes 24.
- the lower portion of the nozzle body 86 is thinner than its upper portion, a transverse shoulder face 96 joining both portions.
- the three main parts of the injector 10 are fixed together by the cap nut 30, the thinner part of the nozzle being inserted in the nut 30 which comes in abutment against the shoulder face 96, the nut 30 being then threaded to the actuator body 32.
- valve body 50 By tightening the cap nut 30, the valve body 50 is axially X1 compressed between the actuator body 32 and the nozzle body 86.
- the lower face 34 of the actuator body comes in sealing surface contact with the upper face 52 of the valve body and, in doing so, the deflector 64, which upper circular edge 72 was protruding above the upper face 52, is slightly pushed downward inside the large recess 60 compressing the leaf spring 74 which still maintains open the inter space S.
- the coil spring 48 protruding out of the solenoid is further compressed as it comes in contact against the top face 82 of the spool.
- the injector 10 is provided with a high pressure conduit 98, for conveying fuel at high pressure from the fuel inlet 18 down to the spray holes 24.
- This high pressure conduit 98 comprises a plurality of portions aligned throughout the actuator, the valve and the nozzle bodies 32, 50, 86. It also diverts from its main path, inlet 18 to holes 24, by having a branch 100 joining the control chamber 94.
- the injector 10 is also provided with a return conduit 102 comprising a first portion 104, or outlet conduit extending in the valve body 50 from the control chamber 94 to the hydraulic bore 56 then, a second portion 106 extending in the actuator body 32 from the large recess 60 to the fuel outlet 20.
- the injector 10 is arranged in a fuel injection equipment of an internal combustion engine and, a control unit, not represented, is connected to the injector to enable piloting to energize the solenoid 38.
- the solenoid 38 When the solenoid 38 is energized, it generates a magnetic field that attracts the armature 78 which then translates toward the solenoid 38 further compressing the coil spring 48.
- the armature-spool assembly 76 moves to an open position OPV where the spool seat 84 lifts away from the fixed valve seat 62 and opens passageway for the high pressure fuel to spring out of the hydraulic bore 56 and enter the large recess 60.
- the decreasing pressure in the control chamber 94 enables the needle valve 92 to lift in an open position OPN enabling fuel injection through the spray holes 24.
- the jet flow entering the large recess 60 hits the under face of the deflector 64 then flows in the inter space S toward the second portion 106 of the return conduit.
- the deflector 64 deflects the jet flow away from the armature 78, the displacements of the armature-spool assembly 76 being undisturbed.
- the valve body 50 is provided on its upper face 52 with two notches 108 diametrally arranged about the opening of the large recess 60.
- the deflector 64 comprises a deflector face 110 which is a circular disc plate provided with a central hole 68 and also with two arms 112 radially extending from the outer edge 114 of the disc. Said arms 112 are slightly angled relative to the plan of the disc 110 so, when in position, the deflector face 110 is placed in deep inside the recess and parallel to the bottom face 58 of the recess and, the two radial arms 112 are set in the notches 108. In that position the inter space S is preserved.
- the deflector 64 further comprises a cylindrical tubular spacer ring 116 placed on the top deflector face 110 and the radial arms 112.
- the spacer ring 116 has a height such that in place before the general assembly of the injector 10, it slightly protrudes above the level of the upper face 52 of the valve body and, it also has an outer diameter smaller that the opening of the large recess 60 so that, when the injector 10 is assembled and the cap nut 30 is tightened, the spacer ring 116 is pushed downward, pushing in turn the deflector face 110 and obliging the radial arms 112 to further resilient bending while still keeping open the inter space S.
- the deflector face has been described with two radial arms 112 although an embodiment with another number of flexible arms is possible.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
- The present invention relates generally to a fuel injector and more particularly to a control valve arrangement.
- In a fuel injector, a control valve indirectly controls the motions of a valve member, also identified as a needle in reference to its elongated shape, by opening and closing an outlet conduit enabling fuel at high pressure to exit a control chamber which internal pressure solicits the needle.
- The control valve comprises a body provided with a hydraulic bore opening in a recess and with a magnetic armature-and-valve-spool-assembly. The spool is slidably arranged in the bore while the disc-shape armature displaces in the recess as a function of a magnetic field generated by a controlled solenoid. The spool and body further define a valve seat which opens or closes when said assembly translates. When the seat opens, fuel at high pressure exiting the control chamber flows through the open passageway and hits the under face of the disc-shape armature when entering the recess. This violent impact disrupts the travel of the armature-and-spool-assembly and the functioning of the control valve.
- Developments have conducted to design the under face of the armature with a slope mitigating the impact but without totally eliminating the motions disturbances.
- It is an object of the invention to resolve or at least mitigate the above mentioned problem in providing a control valve assembly for a fuel injector, the valve comprising a cylindrical body and, an armature-spool assembly adapted to translate within the body. The body extends from a first, or upper, face to an opposed second, or lower, face, and is provided with a large recess opening in the first face and also with a hydraulic distribution bore extending in the body along a main axis from the bottom face of the recess. A fixed valve seat is provided around the opening of the bore in said bottom face of the recess. The body is further provided with a hydraulic outlet conduit extending through the body and opening in the hydraulic bore and also with a return conduit extending from the large recess.
- The armature-spool assembly comprises a disc shape magnetic armature having an upper face opposed to an under face and a stem forming valve spool fixed to the armature and perpendicularly extending from its under face. The armature-spool assembly is further provided with a spool seat arranged in the vicinity of the under face the armature.
- The armature-spool assembly is arranged in the body, the spool being slidably adjusted in the hydraulic bore and the armature being moveable in the recess. Said assembly is able to translate between a closed position where the spool seat is in sealing contact against the fixed valve seat and, an open position where the spool seat is lifted away from the fixed valve seat enabling, in use, fuel to flow to enter in the recess.
- The control valve assembly is further provided with a deflector arranged in the recess, between the armature and the bottom face of the recess, the deflector being adapted to deflect away from the under face of the armature the flow of fuel entering the recess when the valve is in open position so that, the displacements of the armature-spool assembly are not disturbed by said entering flow.
- Also, the deflector comprises a deflector face, or bottom face, provided with a central opening, said deflector face being arranged transverse to the valve axis and being pushed toward the bottom face of the recess by a pusher feature, while being maintained at a distance of the bottom face of the recess by a spacer feature.
- The pusher feature can be a cylindrical wall integral to the deflector face and erecting from the periphery of said deflector face to an upward circular edge, said cylindrical wall outwardly protruding from the recess above the level of first face of the body so that, when the control valve assembly is arranged in a fuel injector, another part of the body of the injector that comes in surface contact with the first face of the valve body downwardly biases the deflector.
- Also, the spacer feature is arranged between the deflector face of the deflector and the bottom face of the recess and it has resilient characteristics so that said spacer feature always biases the deflector face away from the bottom face of the recess.
- The first face of the body is further provided with a plurality of notches, said notches opening in the recess. The deflector also comprises a transverse deflector face provided with a central opening, and with tabs radially extending from the edge of said deflector face, each tab being arranged in a notch.
- In another embodiment, the deflector further comprises a tubular spacer ring non-integral to the deflector face, said spacer ring being placed over the deflector face and outwardly protruding from the recess above the level of first face of the body so that, when the control valve assembly is arranged in a fuel injector, another part of the body of the injector that comes in surface contact with the upper face of the valve body downwardly biases said the spacer ring and the deflector face.
- The invention also extends to a fuel injector comprising a control valve assembly as claimed in any one of the preceding claims.
- The present invention is now described by way of example with reference to the accompanying drawings in which:
-
Figure 1 is an axial section of a fuel injector provided with a control valve arrangement as per a first embodiment of the invention. -
Figure 2 is an axial section of the control valve offigure 1 . -
Figure 3 is an exploded view of the control valve offigure 2 , said valve being provided with a deflector. -
Figures 4, 5 and 6 are three different embodiments of the deflector offigure 3 . -
Figure 7 is a second embodiment of a control valve as per the invention. -
Figure 8 is a top view of the second embodiment offigure 4 . - In reference to
figure 1 is described afuel injector 10, particularly adapted to diesel fuel although the invention is also applicable to gasoline injectors. Theinjector 10 has a generally elongated body 12, theinjector 10 extending along a main axis X1 from ahead 14 to anozzle assembly 22. Thehead arrangement 14, arbitrarily drawn on the top offigure 1 , comprises anelectric connector 16, afuel inlet 18 and afuel outlet 20. The pointy tip extremity of thenozzle assembly 22, at the extreme bottom of the figure, is provided withspray holes 24 for delivering fuel in a combustion chamber. - The
injector 10 generally comprises anactuator member 26 arranged above acontrol valve 28 arranged above thenozzle assembly 22. Said three main sub-assemblies are coaxially X1 fixed to each other's by aninjector cap nut 30. - The
actuator member 26 comprises anactuator body 32 extending from thehead 14 to alower face 34 where opens a recess 36 upwardly extending in thebody 32. Asolenoid 38 is arranged in the recess 36 and is electrically connected to theconnector 16 viaelectric conductors 40 upwardly extending in aspecific conduit 42 opening in the upper part of the recess 36. Between thesolenoid 38 and the bottom of the recess 36 is arranged acompression leaf spring 44 downwardly soliciting thesolenoid 38. The solenoid itself is provided with an internalblind bore 46 wherein is compressed acoil spring 48. - The
control valve 28 has avalve body 50 axially X1 extending between aupper face 52 and an opposedlower face 54. Thevalve body 50 is provided with ahydraulic bore 56 axially extending along a valve axis X2 that is parallel and slightly offset with the main axis X1. Thebore 50 upwardly opens in thebottom face 58 of alarge recess 60 itself opening in theupper face 52 of thevalve body 50. The opening of thehydraulic bore 56 in thebottom face 58 of the recess is surrounded by a conical face forming afixed valve seat 62. - Said axial offset introduced in European patent
EP0740068 presents multiple advantages and is utilized in this description. Despite these advantages, the present invention can be implemented in other injector wherein the two axis are strictly aligned. - In the
large recess 60 is arranged adeflector 64, a first embodiment of which being detailed onfigures 2 and 3 . Said first embodiment of thedeflector 64 is a punched metal sheet having a cup-like shape with abottom face 66 provided with acentral hole 68 and with a peripheralcylindrical wall 70 perpendicularly upwardly erecting from the circular edge of thebottom face 66 up to an uppercircular edge 72. Thedeflector 64 is arranged in thelarge recess 60 so thecentral hole 68 is aligned with thehydraulic bore 56 and, thebottom face 66 of the deflector is parallel to thebottom face 58 of the recess, aleaf spring 74 being arranged between said twobottom faces deflector 64. Alternatively to a washer type leaf spring, any type of spring, such as resilient tongues, enabling to maintain a distance between said twobottom faces figures 4, 5 and 6 present different alternatives ofspring 74 that are integral to thebottom face 66 of thedeflector 64. Thesprings 74 are provided by partially cutting saidbottom face 66 in order to formtongues 75 that are outwardly bent around a non-cut edge, said bending providing resilient characteristics to thetongue 75. - The embodiment of
figure 4 comprises threerectangular tongues 75 each being cut on three sides and slightly bent on the fourth. To provide stability when arranged in thelarge recess 60, thetongues 75 are arranged every 120° relative to the valve axis X2. - The embodiment of
figure 5 comprises sixrectangular tongues 75 arranged by pair of face to face tongues that are cut along their common length and a common width. Thetongues 75 are bent about their non-cut width. To provide stability when arranged in thelarge recess 60, the pair oftongues 75 are arranged every 120° relative to the valve axis X2. - The embodiment of
figure 6 comprises threetongues 75 each forming a circular segment. The cut is operated along the circular edge of thebottom face 58 and the binding is done along the chord of said segment. Again, to provide stability when arranged in thelarge recess 60, thetongues 75 are arranged every 120° relative to the valve axis X2. - In the above examples the
tongues 75 are arranged every 120° while other embodiments of four or more tongues arranged every 90° or less is also possible. - In a free state, when not assembled in the injector, the upper
circular edge 72 of the peripheral wall slightly protrudes above the level of theupper face 52 of the valve body. - Finally, the
control valve 28 is provided with an armature-spool assembly 76 comprising a magnetic disc-shape armature 78 and a stem-likecylindrical spool 80. Thespool 80 downwardly axially X2 extends from an upper end that is inserted and crimped in a central orifice of thearmature 78, thetop face 82 of said upper end slightly protruding above thearmature 78. Thespool 80 is provided with a plurality of cylindrical portions of different diameters and, just below thearmature 80, with a conical face forming aspool seat 84. - When arranged in the
valve body 50, as shown onfigure 2 , thespool 80 is slidably adjusted in thehydraulic bore 56, thespool seat 84 cooperates with the fixedvalve seat 62 and, the spool extends through thecentral hole 68 of thedeflector 64 for thearmature 78 to be inside the cup-like deflector 64. - The
nozzle assembly 22 has abody 86 which extends from anupper face 88 down to the tip provided with the spray holes 24. Thebody 86 is provided with an axial valve bore 90 in which is slidably arrange avalve member 92, also known as a needle valve in reference to its elongated shape. Saidmember 92 extends from a needle head protruding in acontrol chamber 94, close to theupper face 88, down to a pointy tip that forms another valve seat cooperating with the spray holes 24. - Externally the lower portion of the
nozzle body 86 is thinner than its upper portion, atransverse shoulder face 96 joining both portions. - The three main parts of the
injector 10 are fixed together by thecap nut 30, the thinner part of the nozzle being inserted in thenut 30 which comes in abutment against theshoulder face 96, thenut 30 being then threaded to theactuator body 32. - By tightening the
cap nut 30, thevalve body 50 is axially X1 compressed between theactuator body 32 and thenozzle body 86. In particular, thelower face 34 of the actuator body comes in sealing surface contact with theupper face 52 of the valve body and, in doing so, thedeflector 64, which uppercircular edge 72 was protruding above theupper face 52, is slightly pushed downward inside thelarge recess 60 compressing theleaf spring 74 which still maintains open the inter space S. - As it is well known, the
coil spring 48 protruding out of the solenoid is further compressed as it comes in contact against thetop face 82 of the spool. - Also well-known and now briefly described, the
injector 10 is provided with ahigh pressure conduit 98, for conveying fuel at high pressure from thefuel inlet 18 down to the spray holes 24. Thishigh pressure conduit 98 comprises a plurality of portions aligned throughout the actuator, the valve and thenozzle bodies inlet 18 toholes 24, by having abranch 100 joining thecontrol chamber 94. - Furthermore, the
injector 10 is also provided with areturn conduit 102 comprising a first portion 104, or outlet conduit extending in thevalve body 50 from thecontrol chamber 94 to thehydraulic bore 56 then, asecond portion 106 extending in theactuator body 32 from thelarge recess 60 to thefuel outlet 20. - In use, the
injector 10 is arranged in a fuel injection equipment of an internal combustion engine and, a control unit, not represented, is connected to the injector to enable piloting to energize thesolenoid 38. - When the
solenoid 38 is not energized, thecoil spring 48 downwardly pushes the armature-spool assembly 76 in a closed position CPV where thespool seat 84 is in sealing contact against the fixedvalve seat 62. Fuel at several thousands of bars flows in thehigh pressure conduit 98 and its divertingbranch 100, fills in thecontrol chamber 94, the outlet conduit 104 and thehydraulic bore 56. The high pressure in thecontrol chamber 94 solicits theneedle valve 92 in a closed position CPN where fuel injection through the spray holes 24 is prohibited. - When the
solenoid 38 is energized, it generates a magnetic field that attracts thearmature 78 which then translates toward thesolenoid 38 further compressing thecoil spring 48. The armature-spool assembly 76 moves to an open position OPV where thespool seat 84 lifts away from the fixedvalve seat 62 and opens passageway for the high pressure fuel to spring out of thehydraulic bore 56 and enter thelarge recess 60. The decreasing pressure in thecontrol chamber 94 enables theneedle valve 92 to lift in an open position OPN enabling fuel injection through the spray holes 24. - The jet flow entering the
large recess 60 hits the under face of thedeflector 64 then flows in the inter space S toward thesecond portion 106 of the return conduit. Thedeflector 64 deflects the jet flow away from thearmature 78, the displacements of the armature-spool assembly 76 being undisturbed. - In reference to
figures 7 and 8 is now described a second embodiment of thedeflector 64, keeping the references of features having similar a function as in the first embodiment. - In this second embodiment, the
valve body 50 is provided on itsupper face 52 with twonotches 108 diametrally arranged about the opening of thelarge recess 60. Thedeflector 64 comprises adeflector face 110 which is a circular disc plate provided with acentral hole 68 and also with twoarms 112 radially extending from theouter edge 114 of the disc. Saidarms 112 are slightly angled relative to the plan of thedisc 110 so, when in position, thedeflector face 110 is placed in deep inside the recess and parallel to thebottom face 58 of the recess and, the tworadial arms 112 are set in thenotches 108. In that position the inter space S is preserved. - The
deflector 64 further comprises a cylindricaltubular spacer ring 116 placed on thetop deflector face 110 and theradial arms 112. Thespacer ring 116 has a height such that in place before the general assembly of theinjector 10, it slightly protrudes above the level of theupper face 52 of the valve body and, it also has an outer diameter smaller that the opening of thelarge recess 60 so that, when theinjector 10 is assembled and thecap nut 30 is tightened, thespacer ring 116 is pushed downward, pushing in turn thedeflector face 110 and obliging theradial arms 112 to further resilient bending while still keeping open the inter space S. In this second embodiment there is no need forleaf spring 74 placed in the inter space S. - The deflector face has been described with two
radial arms 112 although an embodiment with another number of flexible arms is possible. -
- 10
- fuel injector
- 12
- injector body
- 14
- injector head
- 16
- electric connector
- 18
- fuel inlet
- 20
- fuel outlet
- 22
- nozzle assembly
- 24
- spray holes
- 26
- actuator member
- 28
- control valve
- 30
- injector cap nut
- 32
- actuator body
- 34
- lower face of the actuator body
- 36
- recess
- 38
- solenoid
- 40
- electric conductors
- 42
- conductors conduit
- 44
- leaf spring
- 46
- blind bore internal to the solenoid
- 48
- coil spring
- 50
- valve body
- 52
- upper face of the valve body
- 54
- lower face of the valve body
- 56
- hydraulic bore
- 58
- bottom face of the large recess
- 60
- large recess
- 62
- fixed valve seat
- 64
- deflector
- 66
- bottom face of the deflector - deflector face
- 68
- central hole provided in the bottom face of the deflector
- 70
- peripheral cylindrical wall
- 72
- upper circular edge of the peripheral wall
- 74
- leaf spring
- 75
- tongue
- 76
- armature-spool assembly
- 78
- magnetic armature
- 80
- spool
- 82
- top face of the spool
- 84
- spool seat
- 86
- nozzle body
- 88
- upper face of the nozzle body
- 90
- valve bore
- 92
- valve member
- 94
- control chamber
- 96
- shoulder face
- 98
- high pressure conduit
- 100
- branch of the high pressure conduit
- 102
- return conduit
- 104
- first portion of the return conduit - outlet conduit
- 106
- second portion of the return conduit
- 108
- notches - 2nd embodiment
- 110
- deflector face - 2nd embodiment
- 112
- radial arms - 2nd embodiment
- 114
- outer edge of the deflector face - 2nd embodiment
- 116
- spacer ring - 2nd embodiment
- X1
- main axis
- X2
- valve axis
- S
- inter space
- CPV
- closed position of the valve
- OPV
- open position of the valve
- CPN
- closed position of the needle
- OPN
- open position of the needle
Claims (2)
- Control valve assembly (28) for a fuel injector (10), the valve (28) comprising a cylindrical body (50) and, an armature-spool assembly (76) adapted to translate within the body (50),
the body (50) extending from a first, or upper, face (52) to an opposed second, or lower, face (54), and being provided with a large recess (60) opening in the first face (52) and also with, a hydraulic distribution bore (56) extending in the body along a main axis (X2) from the bottom face (58) of the recess, a fixed valve seat (62) being provided around the opening of the bore (56) in said bottom face (58) of the recess,
the body (50) being further provided with a hydraulic outlet conduit (102, 104) extending through the body and opening in the hydraulic bore (56) and also with, a return conduit (102, 106) extending from the large recess (60),
the armature-spool assembly (76) comprising a disc shape magnetic armature (78) having an upper face opposed to an under face and, a stem, forming valve spool (80), fixed to the armature (78) and perpendicularly extending from its under face, the armature-spool assembly (76) being further provided with a spool seat (84) arranged in the vicinity of the under face the armature,
the armature-spool assembly (76) being arranged in the body (50), the spool (80) being slidably adjusted in the hydraulic bore (56) and the armature (78) being moveable in the recess (60), said assembly (76) being able to translate between a closed position (CPV) where the spool seat (84) is in sealing contact against the fixed valve seat (62) and, an open position (OPV) where the spool seat (84) is lifted away from the fixed valve seat (62) enabling, in use, fuel to flow to enter in the recess (60),
characterized in that
the control valve assembly (28) is further provided with a deflector (64) arranged in the recess (60), between the armature (78) and the bottom face (58) of the recess, the deflector (64) being adapted to deflect away from the under face of the armature the flow of fuel entering the recess (60) when the valve is in open position (OPV) so that, the displacements of the armature-spool assembly (76) are not disturbed by said entering flow and,
the deflector (64) comprises a deflector face, or bottom face, (66) provided with a central opening (68), said deflector face (66) being arranged transverse to the valve axis (X2), and being pushed toward the bottom face (58) of the recess by a pusher feature (70, 116) while being maintained at a distance of the bottom face (58) of the recess by a spacer feature (74, 112) and, the pusher feature (74) is a cylindrical wall integral to the deflector face (66) and erecting from the periphery of said deflector face (66) to an upward circular edge (72), said cylindrical wall (74) outwardly protruding from the recess (60) above the level of first face (52) of the body (50) so that, when the control valve assembly (28) is arranged in a fuel injector (10), another part of the body of the injector that comes in surface contact with the first face (52) of the valve body downwardly biases the deflector (64) and wherein,
the spacer feature (74) is arranged between the deflector face (66) of the deflector and the bottom face (58) of the recess and it has resilient characteristics so that, said spacer feature (74) always biases the deflector face (66) away from the bottom face (58) of the recess and wherein,
said spacer feature (74) is provided by partially cutting said bottom face (66) to form tongues (75) that are outwardly bent around a non-cut edge, said bending providing resilient characteristics to the tongue (75). - Fuel injector (10) comprising a control valve assembly (28) as claimed in any one of the preceding claims.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB201503158A GB201503158D0 (en) | 2015-02-25 | 2015-02-25 | Control valve arrangement |
PCT/EP2016/052118 WO2016134926A1 (en) | 2015-02-25 | 2016-02-02 | Control valve arrangement |
EP16702423.1A EP3262292B1 (en) | 2015-02-25 | 2016-02-02 | Control valve arrangement |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16702423.1A Division EP3262292B1 (en) | 2015-02-25 | 2016-02-02 | Control valve arrangement |
EP16702423.1A Division-Into EP3262292B1 (en) | 2015-02-25 | 2016-02-02 | Control valve arrangement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3431747A1 true EP3431747A1 (en) | 2019-01-23 |
EP3431747B1 EP3431747B1 (en) | 2020-05-27 |
Family
ID=52822174
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18188428.9A Active EP3431747B1 (en) | 2015-02-25 | 2016-02-02 | Control valve arrangement |
EP16702423.1A Active EP3262292B1 (en) | 2015-02-25 | 2016-02-02 | Control valve arrangement |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16702423.1A Active EP3262292B1 (en) | 2015-02-25 | 2016-02-02 | Control valve arrangement |
Country Status (4)
Country | Link |
---|---|
EP (2) | EP3431747B1 (en) |
CN (1) | CN107250525B (en) |
GB (1) | GB201503158D0 (en) |
WO (1) | WO2016134926A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015224177A1 (en) * | 2015-12-03 | 2017-06-08 | Robert Bosch Gmbh | Fuel injector with control valve |
CN112196710A (en) * | 2020-10-09 | 2021-01-08 | 一汽解放汽车有限公司 | Fuel injector |
CN113090800B (en) * | 2021-05-12 | 2022-05-31 | 浙江伟山机械有限公司 | Mechanical valve with automatic flow-off function |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0781913A2 (en) * | 1995-12-23 | 1997-07-02 | LUCAS INDUSTRIES public limited company | Valve arrangement |
EP1231378A2 (en) * | 2001-02-12 | 2002-08-14 | Delphi Technologies, Inc. | Electromagnetic fuel injector comprising flexible element for positioning armature |
DE102007001556A1 (en) * | 2007-01-10 | 2008-07-17 | Robert Bosch Gmbh | Fuel injector for injecting fuel into combustion chamber of internal combustion engine, has magnetic valve accommodated in valve area in injector body of injector, where valve area is separated into wet area and dry area over diaphragm |
DE102007047152A1 (en) * | 2007-10-02 | 2009-04-09 | Robert Bosch Gmbh | Injector with an annulus separate anchor space |
EP2058507A1 (en) * | 2007-11-06 | 2009-05-13 | Robert Bosch GmbH | Fuel injector with optimised shutoff impact |
DE102011078564A1 (en) * | 2011-07-04 | 2013-01-10 | Robert Bosch Gmbh | Control valve for a fuel injector and fuel injector |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3633885B2 (en) * | 2000-08-21 | 2005-03-30 | 株式会社デンソー | Electromagnetic valve device and fuel injection device using the same |
DE102006021741A1 (en) * | 2006-05-10 | 2007-11-15 | Robert Bosch Gmbh | Fuel injector with pressure compensated control valve |
-
2015
- 2015-02-25 GB GB201503158A patent/GB201503158D0/en not_active Ceased
-
2016
- 2016-02-02 EP EP18188428.9A patent/EP3431747B1/en active Active
- 2016-02-02 EP EP16702423.1A patent/EP3262292B1/en active Active
- 2016-02-02 CN CN201680011406.7A patent/CN107250525B/en active Active
- 2016-02-02 WO PCT/EP2016/052118 patent/WO2016134926A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0781913A2 (en) * | 1995-12-23 | 1997-07-02 | LUCAS INDUSTRIES public limited company | Valve arrangement |
EP1231378A2 (en) * | 2001-02-12 | 2002-08-14 | Delphi Technologies, Inc. | Electromagnetic fuel injector comprising flexible element for positioning armature |
DE102007001556A1 (en) * | 2007-01-10 | 2008-07-17 | Robert Bosch Gmbh | Fuel injector for injecting fuel into combustion chamber of internal combustion engine, has magnetic valve accommodated in valve area in injector body of injector, where valve area is separated into wet area and dry area over diaphragm |
DE102007047152A1 (en) * | 2007-10-02 | 2009-04-09 | Robert Bosch Gmbh | Injector with an annulus separate anchor space |
EP2058507A1 (en) * | 2007-11-06 | 2009-05-13 | Robert Bosch GmbH | Fuel injector with optimised shutoff impact |
DE102011078564A1 (en) * | 2011-07-04 | 2013-01-10 | Robert Bosch Gmbh | Control valve for a fuel injector and fuel injector |
Also Published As
Publication number | Publication date |
---|---|
EP3262292A1 (en) | 2018-01-03 |
CN107250525B (en) | 2019-11-05 |
WO2016134926A1 (en) | 2016-09-01 |
EP3431747B1 (en) | 2020-05-27 |
GB201503158D0 (en) | 2015-04-08 |
EP3262292B1 (en) | 2019-07-17 |
CN107250525A (en) | 2017-10-13 |
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