EP3209877A1 - Injecteur de carburant - Google Patents
Injecteur de carburantInfo
- Publication number
- EP3209877A1 EP3209877A1 EP15784621.3A EP15784621A EP3209877A1 EP 3209877 A1 EP3209877 A1 EP 3209877A1 EP 15784621 A EP15784621 A EP 15784621A EP 3209877 A1 EP3209877 A1 EP 3209877A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- needle
- injector
- channel
- control chamber
- 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 title claims abstract description 57
- 238000007789 sealing Methods 0.000 claims description 16
- 230000004888 barrier function Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 description 12
- 239000007924 injection Substances 0.000 description 12
- 230000000295 complement effect Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 230000003042 antagnostic effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/042—The valves being provided with fuel passages
-
- 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
-
- 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
- F02M63/0028—Valves characterised by the valve actuating means hydraulic
- F02M63/0029—Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0043—Two-way valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- 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
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/28—Details of throttles in fuel-injection apparatus
Definitions
- the invention relates to a fuel injector provided with a means of reducing dynamic leakage.
- a fuel injector conventionally comprises a needle controlled opening and closing depending on the pressure differential between a control chamber and the injection nozzle.
- the pressure is a function of the position of a two-way control solenoid valve, or on-off valve, switching between an open position and a closed position.
- the solenoid valve When the solenoid valve is in the closed position, the high pressure fuel can enter the control chamber and bias the needle to the closed position and, when the solenoid valve switches to the open position the fuel previously trapped in the chamber. control can exit via a discharge channel allowing the pressure in the control chamber to decrease.
- the high-pressure fuel continues to enter the control chamber but simply passes through it because it exits directly via the discharge channel. It is known to control this dynamic leak in injectors provided with three-way electro valve, such as in EP2711537, but in the injectors having a two-way valve, this dynamic leakage remains a loss of energy.
- the present invention proposes to at least partially solve these problems by proposing a fuel injector comprising a body in which a needle moves between an open position and a closed position under the influence of the fuel pressure in a control chamber, a chamber into which a high-pressure supply channel opens, and from which a discharge channel controlled by a two-way solenoid valve.
- the injector further includes a dynamic leak reducing means preventing fuel from flowing directly from the channel
- Said dynamic leakage reduction means comprises a movable member moving between an open position and a closed position under the influence of the fuel pressure differential existing between the control chamber and a second control chamber in fluid communication with the channel discharge.
- the mobile member is a cylindrical piston arranged sliding in a bore of the injector body, the supply channel opening into said bore.
- the piston moves to an open position when
- the solenoid valve is in the closed position so that the high pressure fuel can enter the control chamber and, it moves to a closed position when the solenoid valve is in the open position so as to prevent the entry of the high fuel pressure in the control chamber.
- said bore is coaxial with the bore in which the needle slides.
- the piston comprises an enlarged base surmounted by a cylindrical body of smaller diameter.
- the lower face of said base is arranged facing the needle and the junction face between the base and the body forms a sealing face cooperating with a seat provided in the injector body.
- the sealing face and the seat are in sealing contact preventing the entry of high-pressure fuel into the control chamber and, in the open position of the piston, the sealing face and the seat move away allowing between them fuel at high pressure.
- the piston is furthermore provided with a channel opening permanently putting in fluid communication the chamber of control and the second control chamber.
- Said channel may be an axial channel.
- said opening channel may be provided with a section restriction generating a pressure drop so that the pressure in the control chamber is greater than the pressure in the second control chamber.
- the piston may be provided with a calibrated channel extending radially between the outer cylindrical face of the cylindrical body and said channel opening to establish a hydraulic communication between the high pressure supply and the second control chamber.
- the piston comprises a simple cylindrical body extending axially between a lower face arranged facing the needle, the said lower face forming the ceiling of the control chamber and an upper face opposite the face. lower, said upper face coming into contact against a transverse face of the mjector body when the piston has moved in closed position.
- a spring is arranged in the control chamber and compressed between a shoulder secured to the needle and the underside of the piston so as to constantly urge both the needle towards its closed position and the piston towards its position. closed.
- the piston is provided with a first channel extending from the outer wall of the piston to the upper face and also with a second channel extending between the lower and upper faces, the piston being arranged in its bore so that the feed channel either
- the first channel may comprise an annular groove arranged on the outer wall of the piston, the first channel extending from said groove and opening into the upper face of the piston, the supply channel, opening into the space defined by the annular groove .
- the piston is further provided on its upper face with a protuberance forming a sealed barrier when the piston is in the closed position, said barrier then being in sealing contact against said transverse face of the injector body, the first channel and the second channel. opening in the upper face of the piston on either side of said barrier, said second control chamber being the space between the transverse face of the injector body and the upper face of the piston and bounded by the side of the barrier where the second channel leads and leads discharge.
- the barrier is a circular and closed lip, the first channel opening into the central portion and the second channel opening into the outer portion.
- the injector is provided with a device for generating on the needle a closing force directed towards the tip of the needle, greater than the opening force directed towards the head of the needle. the needle so that the fuel pressure injected when the needle is in open position is equal to the fuel inlet pressure in the injector.
- Said device consists of a piston whose cross section is greater than the cross section of the needle so that the pressurized fuel entering the second control chamber exerts on said piston an increased force.
- the piston is sized to contact the needle head as soon as the piston begins to move to the open position.
- the increased force exerted by the high pressure fuel in the second control chamber is then integrally transmitted to the needle so that the needle is subjected to a closing force of intensity greater than the opening force exerted by the fuel. level of the tip of the needle.
- Figure 1 is an axial sectional view of an injector provided with a dynamic leakage reduction means according to the invention.
- FIG. 2 is a magnified detail in axial section of the region of the injector comprising said means produced according to a first embodiment.
- Figure 3 is similar to Figure 2 in an even more detailed view of the means.
- FIG. 4 is a detail seen from above of the means of FIGS. 2 and 3.
- FIG. 5 is an isometric view of a movable piston of the means of FIGS. 2 to 4.
- FIG. 6 is an axial section of the piston of FIG. Figure 7 is an axial section of an alternative to the first embodiment of Figures 2 to 5.
- FIG. 8 is a magnified detail in axial section of the region of the injector comprising said means produced according to a second embodiment.
- Figure 9 is similar to Figure 8 in an even more detailed view.
- FIG. 10 is an isometric view of the movable piston of the means of FIGS. 8 and 9.
- FIG. 11 is a schematic graph of operation of the dynamic leakage reduction means, regardless of its embodiment.
- FIG. 1 is an axial section of a fuel injector 10 which extends along a longitudinal axis Al from an injector head 12, drawn at the top of the figure, to an injection nozzle 14, drawn in FIG. bottom of the figure.
- the injector 10 comprises the head 12 in which are arranged a high-pressure inlet mouth 16 and partially visible only, a low-pressure outlet mouth 18.
- the injector head 12 is integral with an actuator body 20, itself secured by an injector nut 22 to a control valve 24, a high guide 26 and the body 28 of the injection nozzle 14 .
- the actuator body 20 is generally cylindrical with a longitudinal axis A1 and extends from the head 12 to a lower face 30. It is further provided, on its outer cylindrical face in the vicinity of said lower face 30 , a male thread 32 provided for complementary engagement by screwing the female thread 34 of the injector nut 22 and, it is further provided with a cylindrical inner bore 36 extending along a second axis A2, parallel to the longitudinal axis Al but slightly offset from it.
- the bore 36 opens into the lower face 30 and, in the bore 36 is arranged fixed the coil 38 of an electromagnet 40 which in the lower part is flush with the lower face 30 of the actuator body 20. From the coil 38 leave towards the injector head 12 electrical connection means 42, such as cables. These means 42 extend in a specific conduit to a connector 44 provided with terminals for connecting the coil 38 to an external control unit not shown.
- the coil 38 is itself provided with a central bore 46 in which a valve spring 48 is arranged.
- the control valve 24 comprises a cylindrical valve body 50 of longitudinal axis revolution A1 extending between an upper face 52 and a lower face 54 and provided with an axial bore 56 comprising two coaxial sections along the second axis A2, the first section opening into said upper face 52 is a wide and shallow countersink forming a low pressure chamber 58, the center of the bottom 60 of which extends towards the lower face 54 the second section forming a hydraulic distributor bore 62.
- this boring distributor 62 axially A2 blind, several arrivals of channels open laterally.
- the set of channels and conduits which is provided with the injector 10 will be detailed further.
- the injector represented in FIG. 1 and on which this description is based is only a non-limiting example and, many alternatives of constructions exist and will be mentioned however, the alternatives which would be omitted can not be excluded. the scope conferred by the
- the control valve 24 further comprises a rod-armature assembly 64 comprising a magnetic armature 66 and a valve stem 68 arranged movable in the axial bore 54.
- the armature 66 has the general shape of a thick disk which is placed in the low pressure chamber 58 and the valve stem 68 is a cylindrical shaft comprising sections of different diameters and one end of which is embedded and crimped in the center of the armature 66.
- the valve stem 68 extends perpendicular to the armature 66 and coalesces in a fair-slip fit in the dispensing bore 62.
- the valve stem 68 is slidable directly into the dispensing bore 62 or alternatively as shown in FIG. 2, in a cylindrical sleeve 70 radially pierced with at least one radial hole, the sleeve 70 being inserted tightly into the dispensing bore 62.
- the coil 38, its central bore 46, the valve spring 48, the axial bore 56 of the valve body, the magnetic armature 66 and the valve stem 68 are coaxial extending along the second axis A2 .
- the valve spring 48 compressed between the bottom of the central bore 46 of the coil and the valve stem 68 whose head is flush with the center of the armature 66, continuously urges the armature-rod assembly 64 to a position remote from the coil 38, a position called the closed position of the valve PFV in opposition to a position close to the coil called open position of the valve POV.
- the injection nozzle 14 comprises the nozzle body 28, the high guide 26, a needle 72 and a needle spring 74.
- the nozzle body 28 and the top guide 26 are two pieces. distinct.
- injectors whose nozzle body incorporates the high guide exist and can equally benefit from the present invention.
- the nozzle body 28 has a tapered cylindrical wall 76 extending along the longitudinal axis Al from an upper face 78 into a first wide section 80 and a narrower second section 82 which is narrowed at its lower end.
- the outer faces of the two sections 80, 82 are connected in a transverse disc face 84 against which the injector nut 22 bears.
- the wall 76 defines a continuous interior space 86 divided into a large cylindrical chamber 88 located in the first section 80 and a narrow chamber 90 located in the second section 82.
- the large cylindrical chamber 88 opens into the upper face 78 forming a high countersink 92 adapted to receive and position the high guide 26.
- the narrow chamber 90 defines at a portion of its lateral cylindrical wall a low sliding guide 94 and the end of the narrow chamber 90 closes similarly to the second section 82 in a female cone forming a seat 96 of the nozzle body circulating a plurality of injection holes 98 passing through the wall 76 of the nozzle body.
- the high guide 26 is, in the nonlimiting example described, a cylindrical independent piece of revolution extending along the longitudinal axis Al from a transverse upper face 100 and comprises a large upper cylinder 102 and a narrow lower cylinder 104, the two cylinders 102, 104, joining in a shoulder face 106.
- the high guide 26 further comprises a through axial bore 108 passing through through the two cylinders 102, 104, the bore 108 defining in the lower part, located in the narrow cylinder 104, a top sliding guide 110 and, in the upper part located in the large cylinder 102, a control chamber 112 in which is arranged a movable piston 114 now described.
- Said mobile piston 114 extends axially between an upper face 116 to a lower face 118, the upper face 116 being provided with a boss rising slightly above said upper face 116, boss at the center of which is formed a high concave housing 120 so that said boss circumscribes the opening of the upper housing 120 forming a circular peripheral lip 122.
- the piston 114 is also provided a low concave housing 124.
- top 120 and bottom 124 are functional centering holes for a particular machining mode. In an alternative not shown corresponding to a different embodiment these housings could not be made.
- the piston 114 is further provided on its cylindrical side face with an annular groove 126 and a first channel 128 joining the groove 126 inside the upper housing 120, the opening of said first channel 128 being therefore inside the lip 122 and, as well as a second channel 130 joining the interior of the lower housing 124 to the upper face 116, the upper opening of said second channel 130 being outside the lip 122.
- the needle 72 is an elongated cylindrical shaft extending from a needle head 132 to a conical tip 134 defining a needle seat 136.
- the needle head 132 is provided with a small cylindrical protuberance 138 connected to the body of the needle by a bearing shoulder 140, the body of the needle forming in this part of the head a high needle guide 142 and, opposite the head 116 near the tip 134, the needle 72 has a wider portion forming a needle guide low 144.
- the nozzle body 28 receives in its high countersink 92 the wide cylindrical portion 102 of the top guide 26, the narrow portion 104 extending into the wide chamber 88 of the nozzle body 28.
- the face shoulder 106 of the high guide is in sealing abutment against the bottom of the top counterbore 92 and the top guide 26 is radially held by the inner flange of the same counterbore 92.
- the top sliding guide 110 and the bottom sliding guide 92 are coaxial along the longitudinal axis A1 and receive the needle 72 in a complementary manner, the high needle guide 142 sliding in the top sliding guide 110 and the bottom guide 144 sliding in the bottom sliding guide 92 of the nozzle body.
- the needle spring 74 is compressed in the control chamber 112 between the bearing shoulder 104, integral with the needle 72, and the lower face 118 of the movable piston 114.
- the upper face 100 of the high guide is maintained in sealed surface contact against the underside of the valve body 54 and the upper face 52 of the valve body itself is in sealed surface contact against the underside 30 of the actuator body. .
- This integral and impermeable stack is made possible by the injector nut 22 which, threaded around the second narrow section 82 of the nozzle body 28 bears against the disc face 84 of the same nozzle body and extends axially according to FIG. longitudinal axis A1 so as to enclose the high guide 26 and the control valve 24 to screw on the actuator body 20 through the complementary threads 32, 34 previously described.
- the surface seals are provided on the one hand by the mirror quality of the state of the surfaces in contact and on the other hand by the sufficiently large tightening torque of the nut 22 which generates a strong compression between the lower body of the body. actuator, the valve body, the top guide and the nozzle body.
- the armature-rod assembly 64 although biased by the valve spring 48, can move axially along the second axis A2 between the closed position PFV valve, or low position wherein the armature-rod assembly 64 is remote from the coil 38 and the valve open position POV, or high position in which the armature-rod assembly 64 is near the coil 38.
- the needle 72 can move axially along the longitudinal axis A1 between a closed needle position PFA, also
- the movable piston 114 also biased by the needle spring 74, can move axially along the longitudinal axis A1 between an open position of the piston POP, or low position in which the peripheral lip 122 is away from the face 54 of the valve body and a closed position of the PFP piston, or high position in which the peripheral lip 122 is in sealing contact against the lower face 54 of the valve body.
- the injector 10 is further provided with channels and ducts comprising complementary sections between the elements of the injector, these channels and ducts form a high pressure circuit 146 and a low pressure return circuit 148 in which, in use of the fuel circulates .
- the high pressure circuit 146 includes a first main conduit 150, extending into the actuator body 20 between the inlet port 16 and the lower face 30 of the actuator body, the main conduit 150 being extended by a second conduit 152 passing through the valve body 50 and then through a third conduit 154 passing through the wide cylindrical portion 102 of the top guide, said third conduit 154 opening into the shoulder face 106 of the top guide between the narrow portion 104 and the inner side face of the wall 76 of the nozzle body, and opening into the wide chamber 88 of the nozzle body 28.
- the high pressure circuit 146 then continues into the interior space 86 of the nozzle body to the injection holes 98.
- the high pressure circuit 146 further comprises a fourth conduit 156 provided in the top guide 26 and joining said shoulder face 106 within the axial bore 108 where it opens into the annular space defined by the throat at nnulaire 126 of the piston 114.
- the high-pressure fuel can follow the path indicated by the arrow F1 in FIG. 3. From the top housing 120, it passes above the lip 122, between said lip 122 and the lower face. 54 of the valve body, then flows into the second channel 130 of the piston so as to fill the control chamber 112.
- the high pressure fuel leaving the first channel 128 and having filled the high concave housing 120 can not cross the lip 122 which is in sealing contact against the lower face 54 of the valve body.
- the low pressure return circuit 148 comprises a discharge duct 158 provided in the valve body and semitransparently sketched in FIGS. 2 and 3.
- This exhaust duct 158 extends from the underside 54 of the valve body where it opens on the outer portion of the axial bore 108 of the top guide, outside the lip 122 of the piston 114, and extends to open into the bore hydraulic 62.
- This space between the outside of the lip 122 of the piston 114 and the lower face 54 of the valve body, space in which the discharge conduit 158 opens out forms a second control chamber 160.
- the evacuation duct is made of a first short section 162 opening under the valve body 50, connecting perpendicularly to a second longer section 164 going in a straight line to the bore 62.
- the second section 164 opens into the lower face 54 of the valve body but this end is closed on mounting by the upper face 100 of the top guide.
- the return circuit 148 then continues in the hydraulic distributor bore 62, or even through the holes of the sleeve 70, then up to the low pressure chamber 58 of which said circuit 148 continues through a main return conduit 166 , not shown, which extends in the actuator body 20 in parallel with the main high-pressure conduit 150 from the lower face 30 to the outlet mouth 18.
- the return circuit 148 further comprises a valve leak recovery duct, said duct also shown semi-transparent in FIG. 2, extends radially in the valve body 50 from the bottom of the valve. the axial bore 56 to join the lateral cylindrical wall of the valve body where the recovery conduit opens into an annular space between said side wall and the injector nut 22, to then rejoin the low pressure chamber 58 and the main return duct 166.
- a valve leak recovery duct said duct also shown semi-transparent in FIG. 2, extends radially in the valve body 50 from the bottom of the valve. the axial bore 56 to join the lateral cylindrical wall of the valve body where the recovery conduit opens into an annular space between said side wall and the injector nut 22, to then rejoin the low pressure chamber 58 and the main return duct 166.
- the coil 38 is not electrically powered, it does not create a magnetic field and therefore does not attract the magnetic armature 66.
- the valve spring 48 pushes the frame-rod assembly 64 in the closed position PFV, position in which the valve stem 68 closes the hydraulic communication between the axial bore 56 and the low pressure chamber 58 and thus prevents the fuel from joining the return circuit 148.
- the high pressure fuel entering permanently into the injector, in the absence of evacuation the pressure increases in the two sections 162, 164 of the discharge duct of the valve body and in particular above the piston 114 in the second control chamber 160.
- the movable piston 114 is pushed back downward in the open position POP and, as previously described, the high pressure fuel can enter the control chamber 112 where the pressure increases and pushes the needle 72 down, in positive position. we closed PFA. On either side of the piston 114 the pressure is then balanced. The needle 72 moves according to a pressure differential between the head and the tip of the needle. Thus, as the pressure increases in the control chamber 112, for the needle 72 to move downward it is necessary to provide the injector 10 with a device to reduce the pressure on the tip side.
- injectors whose high pressure circuit is provided with a calibrated orifice arranged between the entrance into the control chamber and the injection holes.
- Such a function can also be achieved by means of a flange, also called in English “boost flange” or “NMC - needle motion control", integral with the needle and leaving only a small passage to the flow of high pressure fuel, said passage generating the desired pressure drop on the side of the tip.
- the coil 38 is electrically powered, it then generates a magnetic field which attracts the armature 66 which, despite the solicitation of the valve spring 48, rises and approaches the coil 38 in the open position of the valve POV.
- the fuel previously trapped in the evacuation duct 162, 164 can be evacuated to the low pressure chamber 58 and the main return duct 16.
- This rapid evacuation creates a negative pressure in the second control chamber 160, which draws the piston upwards, the movable piston 114 is then placed in the closed position PFP, the lip 122 coming into sealing contact against the lower face 54 of the valve body.
- the high-pressure fuel can no longer exit the top housing 120 of the piston and the one that is trapped in the control chamber 112 can exit via the second channel 130, bypass the lip 122 and join the conduit discharge 162, 164, then the return circuit.
- Figure 11 is a two-dimensional graph schematically showing the curve of changes in the pressure in the control chamber 112, as a function of time. Above the curve a table indicates the positions in which the armature rod assembly 64, the movable piston 114 and the needle 72 are placed.
- the point P1 intersection of the curve with the ordinate axis, pressure axis, marks the instant when the coil 38 begins to be energized, the armature-rod assembly 64 then moves to the open position POV while the pressure in the control chamber 112 is still high and the needle 72 is in the closed position PFV. From the point PI, the piston is placed in closed position PFP and the pressure in the control chamber 112 decreases until the needle goes back to the open position POA.
- the next point P2 marks the instant when the power supply of the coil 38 is interrupted, the armature-rod assembly 64 being immediately pushed by the valve spring 48 in the closed position PFV while the pressure in the control chamber 112 is still low and that the needle 72 is in the open position POA. Very soon after point P2, the piston is placed in open position POP and the pressure in the control chamber 112 rises to the point where the needle returns to the closed position PFA.
- the piston 114 has an outside diameter substantially greater than the diameter of the needle 72.
- the lower housing 124 of the The lower face 118 of the piston can be enlarged into a counterbore of sufficient size to accommodate the head 132 of the needle and the spring 74.
- the arrangement of such a piston 114 obviously requires that the upper end emerging from the axial bore of the upper guide 108 is itself enlarged to receive the new piston widens.
- the interest of this alternative of realization appears in the explanation of operation.
- the dimensions can easily be selected so that as soon as the piston 114 begins to move downwards it enters into mechanical contact with the needle head and then, the axial force exerted on the upper face 1 16 of the piston is integrally transmitted to the needle 72.
- the axial force can be transmitted by hydraulic pressure exerted on the head of the needle.
- the high pressure now acts on the needle 72 by generating on the head an axial closing force directed towards the tip and on the tip an axial force of opening of weaker intensity directed towards the head.
- the piston widens allows to increase the force on the needle head without any loss of energy, the fuel pressure injected by the injection holes 98 being the pressure at which the fuel enters the injector 10 without there being any pressure loss.
- FIGS. 8, 9 and 10 A second embodiment of the invention is now described with reference to FIGS. 8, 9 and 10, mainly by way of differences with the first embodiment previously described and, while preserving as far as possible the signs and numbers of the references. already used.
- the main difference lies in the shape of the axial bore 108 of the high guide and that of the movable piston 114.
- the bore 108 is formed in a high section 170 serving only as a sliding guide to the piston 114, said high section 170 being of smaller diameter than the low section which forms the upper sliding guide 110 in which the head of the needle 132.
- the two sections 170, 110 are connected by a connecting disc surface 172 which can, as is shown in the figures be slightly tapered.
- the movable piston 114 comprises a cylindrical body 174, slidably arranged in the upper portion 170 of the axial bore 108, a low flange 176 arranged in the control chamber 112 and a connecting shoulder 178 between the flange 176 and the body 174 of the piston.
- the piston is further provided with an axial opening opening 180 which, according to the alternative shown, comprises a section restriction 182.
- the piston 114 is provided with a small calibrated channel 184 extending radially and joining the outer face of the piston 114 to the axial orifice 180. This calibrated channel 184 establishes a permanent hydraulic connection between the high-pressure inlet and said axial orifice 180.
- the fourth high pressure conduit 156 opens into the axial bore 108 just above the collar 176.
- the mobile piston 114 can, like the previous description, move between a high position or closed position PFP in which
- the shoulder 178 and the disc surface 172 are spaced from each other.
- the fuel located in the control chamber 112 leaves the latter through the axial orifice 180 and then continues in the return circuit 148. passing as previously described, successively by the two sections 162, 164 of the exhaust duct.
- a little high pressure fuel can flow through the calibrated channel 184 between the arrival and the upper face of the piston. This allows, at the moment when the valve 24 closes PFV, to accelerate the filling of the second control chamber 160 and its rise in pressure which makes it possible to push the piston towards the open position POP.
- the filling of the second control chamber 160 can be done only by fuel passing between the piston 114 and the top portion 170 of the bore 108. This filling can take a relatively long time and, without this solution can be discarded, the realization of the calibrated channel 184 seems preferred.
- the high pressure fuel enters the control chamber 112, following the path of the arrow F2, passing between the shoulder 178 and the disc surface 172 and pressurizes said chamber 112 so as to push the needle 72 in the PFA closed position.
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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)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1460054A FR3027350B1 (fr) | 2014-10-20 | 2014-10-20 | Injecteur de carburant |
PCT/EP2015/074051 WO2016062639A1 (fr) | 2014-10-20 | 2015-10-16 | Injecteur de carburant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3209877A1 true EP3209877A1 (fr) | 2017-08-30 |
EP3209877B1 EP3209877B1 (fr) | 2020-12-09 |
Family
ID=52627298
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15784621.3A Active EP3209877B1 (fr) | 2014-10-20 | 2015-10-16 | Injecteur de carburant |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3209877B1 (fr) |
JP (1) | JP6701212B2 (fr) |
FR (1) | FR3027350B1 (fr) |
WO (1) | WO2016062639A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3053409A1 (fr) * | 2016-06-30 | 2018-01-05 | Delphi International Operations Luxembourg S.A R.L. | Injecteur de carburant |
CN113498452B (zh) * | 2019-01-09 | 2023-08-08 | 德尔福知识产权有限公司 | 液压阀 |
WO2020260285A1 (fr) * | 2019-06-25 | 2020-12-30 | Ganser Hydromag Ag | Soupape d'injection de carburant pour des moteurs à combustion interne |
WO2021110663A1 (fr) * | 2019-12-03 | 2021-06-10 | Ganser-Hydromag Ag | Soupape d'injection de carburant dotée d'une soupape à tiroir pour moteurs à combustion interne |
GB2592019B (en) * | 2020-02-12 | 2022-07-06 | Delphi Tech Ip Ltd | Diesel injector with an optimized valve assembly |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19618468C1 (de) * | 1996-05-08 | 1997-04-30 | Siemens Ag | Einspritzventil |
JP3557996B2 (ja) * | 1999-06-21 | 2004-08-25 | トヨタ自動車株式会社 | 燃料噴射装置 |
JP3527215B2 (ja) * | 2001-04-26 | 2004-05-17 | 株式会社日本自動車部品総合研究所 | 燃料噴射弁 |
AU2003201421A1 (en) * | 2002-02-22 | 2003-09-09 | Crt Common Rail Technologies Ag | Fuel injection valve for internal combustion engines |
CH700396A1 (de) * | 2009-02-09 | 2010-08-13 | Ganser Hydromag | Brennstoffeinspritzventil für Verbrennungskraftmaschinen. |
JP5493966B2 (ja) * | 2009-06-02 | 2014-05-14 | 株式会社デンソー | 燃料噴射装置 |
US8132558B2 (en) * | 2009-12-01 | 2012-03-13 | Stanadyne Corporation | Common rail fuel pump with combined discharge and overpressure relief valves |
JP5549293B2 (ja) * | 2010-03-15 | 2014-07-16 | 株式会社デンソー | 燃料噴射装置 |
JP5732834B2 (ja) * | 2010-03-31 | 2015-06-10 | 株式会社デンソー | 燃料噴射装置 |
GB201414669D0 (en) * | 2014-08-19 | 2014-10-01 | Delphi International Operations Luxembourg S.�.R.L. | Control valve arrangement |
-
2014
- 2014-10-20 FR FR1460054A patent/FR3027350B1/fr not_active Expired - Fee Related
-
2015
- 2015-10-16 JP JP2017540315A patent/JP6701212B2/ja active Active
- 2015-10-16 WO PCT/EP2015/074051 patent/WO2016062639A1/fr active Application Filing
- 2015-10-16 EP EP15784621.3A patent/EP3209877B1/fr active Active
Also Published As
Publication number | Publication date |
---|---|
JP6701212B2 (ja) | 2020-05-27 |
WO2016062639A1 (fr) | 2016-04-28 |
FR3027350B1 (fr) | 2019-10-04 |
JP2017531765A (ja) | 2017-10-26 |
EP3209877B1 (fr) | 2020-12-09 |
FR3027350A1 (fr) | 2016-04-22 |
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