CN101896715A - On-off valve for injectors - Google Patents
On-off valve for injectors Download PDFInfo
- Publication number
- CN101896715A CN101896715A CN2008801201424A CN200880120142A CN101896715A CN 101896715 A CN101896715 A CN 101896715A CN 2008801201424 A CN2008801201424 A CN 2008801201424A CN 200880120142 A CN200880120142 A CN 200880120142A CN 101896715 A CN101896715 A CN 101896715A
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- Prior art keywords
- shut
- block
- switch valve
- sleeve pipe
- targeting part
- Prior art date
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Links
- 239000000446 fuel Substances 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 230000008685 targeting Effects 0.000 claims description 30
- 238000007789 sealing Methods 0.000 claims description 17
- 235000012489 doughnuts Nutrition 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000013016 damping Methods 0.000 abstract description 12
- 238000002347 injection Methods 0.000 abstract description 8
- 239000007924 injection Substances 0.000 abstract description 8
- 230000033001 locomotion Effects 0.000 description 15
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000010992 reflux Methods 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
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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
- 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
- F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
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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
- 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
- F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
- F02M63/008—Hollow valve members, e.g. members internally guided
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means
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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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/003—Valve inserts containing control chamber and valve piston
Landscapes
- 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)
- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to an on-off valve for injectors, especially fuel injectors (1), comprising a closing element (31) which allows the pressure in a control chamber (9) for actuating an injection valve member (3) to be relieved. The closing element (31) is controlled by a magnetic actuator encompassing a magnet subassembly (51) and an armature (49). The closing element (31) is connected to a stop element in such a way that the stop element and the closing element (31) enclose a damping chamber (71) that is filled with liquid. The amount of liquid in the damping chamber (71) remains substantially constant when the closing element (31) is moved such that the closing element (31) and the stop element are jointly moved.
Description
Technical field
The present invention relates to being used for sparger, being particularly useful for the switch valve of fuel injector according to the preamble of claim 1.
Background technique
In order to supply fuel to the firing chamber of internal-combustion engine, used fuel injector.The fuel that will be under the high pressure is ejected in the firing chamber in the case.Especially use the high pressure accumulator ejecting system on the internal-combustion engine of self ignition, wherein jet pressure is relevant with the rotating speed and the load of internal-combustion engine.Can reduce the harmful matter of formation when burning thus.In order to reach further reducing of harmful matter, then need significantly improving of jet pressure.
The fuel injector that can spray under required pressure is made to leak free.Cancelled low pressure stage for this reason.But the cancellation by low pressure stage only can provide little needle closing force.This has caused steep characteristic curve group and has caused the little emitted dose ability of difference thus.But this shortcoming can compensate with the valve of switch soon.
For example by DE 10 2,007 028 485 known be used for the switch valve of the Fuelinjection nozzle of snap switch.On this switch valve, limit a pressure chamber by a control sleeve pipe, this control sleeve pipe be bearing in movingly its vertically on.The control sleeve pipe has a sealing surface in that one is distolateral, and it cooperatively interacts by sealing face and a valve seat that is formed on the valve body.In valve body, a groove is arranged at valve body structure on the side of pressure chamber.Groove in control sleeve pipe and the valve body is constituted in this wise, so that controls the distortion by pressure in pressure chamber of sleeve pipe and valve body and only cause little motion between valve seat and the sealing surface of controlling sleeve pipe or minimum motion.
But the valve of snap switch has its shortcoming, promptly because characteristic fluctuation appears in spring.On the one hand owing to impact firmly to combine and formed the spring of shut-off block with the quick closedown parts.The hard collision of impacting by metal to metal causes.And the spring that occurs when shut-off block impacts has negative effect and causes big stroke/Stroke Control amount usually the function of fuel injector.On the switch valve of magnet control on the up stroke backstop between armature and the electromagnet structure top clearance is arranged, this top clearance make the backstop damping and reduce thus the spring.But this top clearance reduces the impact momentum of shut-off block on valve seat because the sealing function of valve seat can not be applied on the valve seat.
Summary of the invention
The switch valve that is used for sparger, is particularly useful for fuel injector that constitutes according to the present invention comprises a shut-off block, can make a control room release spray valve member with operation by this shut-off block.Shut-off block is controlled by a solenoid actuated device that comprises electromagnet assembly and armature.Shut-off block is connected in this wise with a backstopping assembly, so that this backstopping assembly and shut-off block surround a dampening chamber, wherein dampening chamber be marked with liquid and when shut-off block moves its amount of liquid keep constant basically so that shut-off block and backstopping assembly move together.
Open between moving period at shut-off block, the pressure in the dampening chamber at first descends.Because this pressure descends, and causes a power on backstopping assembly, by this power backstopping assembly is moved with shut-off block.The volume of dampening chamber does not change under the situation that keeps the same liquid amount.The invariant position of the relative shut-off block of backstopping assembly in this way.Pressure when switch valve cuts out in the dampening chamber at first increases.Backstopping assembly moves with shut-off block.When stop, between backstopping assembly and a stop surface, form a top clearance, make the major part damped and the absorption impact momentum of moving by this top clearance.Shut-off block move through in dampening chamber overall vibration the time increased pressure damped.The spring or the wearing and tearing of valve seat can be avoided, because the stop of the major part of impact momentum by backstopping assembly is eliminated.
In a preferred form of implementation, backstopping assembly is configured to the form of a sleeve pipe.When backstopping assembly is configured to the form of a sleeve pipe, preferably, shut-off block is directed in sleeve pipe, wherein one of sleeve pipe on the direction of electromagnet assembly the upper-end surface and the aspectant end face in the upper end at sleeve pipe of shut-off block between constitute dampening chamber.Adapt to the position of shut-off block for the position that makes backstopping assembly under the situation of having closed at switch valve, preferably, the upper-end surface of sleeve pipe is sealed in this wise by a ring edge, so that the outside of the end face of the inboard of ring edge and shut-off block constitutes an annular space when switch valve cuts out and under the buttoned-up situation of switch valve.The relative peripheral space in this annular space plays throttling action, so that the pressure in the dampening chamber is higher than peripheral pressure.Can guarantee all to be marked with in the dampening chamber liquid thus.Can realize the compensation of liquid in addition in this way, this is necessary when at first having changed the position of the relative backstopping assembly of shut-off block by the prooving of valve seat for example.All the time guarantee the function of backstopping assembly in this way.Therefore when requiring dampening chamber's volume to diminish for compensated position, liquid can flow out by the annular space.
Another advantage according to the structure of switch valve of the present invention is that hydraulic damping power only is the armature function of speed.Different with the situation of top clearance, armature travel does not have influence to damping force.Even in this way stroke drift-this for example can form owing to the prooving of valve seat-time still can guarantee: valve cuts out at any time.
In a preferred implementing form, the relative shut-off block of sleeve pipe can move in the axial direction.The advantage of this form of implementation is that damper only works when valve cuts out and be inoperative when valve is opened.Prevented that in this way valve from opening undesirable time-delay of motion.The volume increase that motion makes dampening chamber of opening by shut-off block.Pressure in the dampening chamber is descended.Because the relative shut-off block of sleeve pipe can move in the axial direction, sleeve pipe at first can move with shut-off block, so that dampening chamber's volume can keep constant basically and needn't overcome owing to pressure in the dampening chamber reduces to act on power on the shut-off block.Therefore can realize opening fast of switch valve.
In a preferred form of implementation, have on the enlarged of a dish type and spring members is supported on sleeve pipe with a side the dish type enlarged and be supported on the armature with opposite side at structure on the sleeve pipe.Spring members is preferably the helical spring of a formation stage clip.By spring members sleeve pipe is bearing on its backstop under the situation that switch valve cuts out.Can compensate the position change of the position change of shut-off block and sleeve pipe-for example when stroke drifts about, occur thus.The volume of dampening chamber changes in the case, but next open and close closed procedure during still keep constant, to satisfy damping function.
Reach the interference that does not cause thus ejector function for shut-off block not being tilted or not moving diametrically, shut-off block is preferably configured as sleeve-shaped and is directed on a guide finger.Guide finger structure between targeting part on of shut-off block and following targeting part has a doughnut in a preferred implementing form.This doughnut is as the leakage collecting chamber of the liquid that flows through as leakage rate by following targeting part.Is connected because the leakage-gap between following targeting part and the shut-off block forms hydraulic pressure with discharge route from the control room, the leakage collecting chamber is injected into liquid.
Preferably, last targeting part and down each structure of targeting part make leakage-gap so that go up targeting part and down targeting part play the effect of pressure voltage divider and the pressure in the doughnut can by last targeting part and down the gap size of targeting part regulate.Because last targeting part, the pressure that leaks in the collecting chamber will be higher than the area of low pressure; And owing to also play the following targeting part of throttling action, this pressure is lower than system pressure.When 1000 system pressures that cling to that surpass far away will appear during as the fuel injector in the high pressure accumulator ejecting system here in this sparger.
Be used as leak collecting chamber doughnut advantageously the dampening chamber between the end face of the upper-end surface by passage in the shut-off block and sleeve pipe and shut-off block be connected.Liquid can flow in the dampening chamber by leaking collecting chamber in this way.To guarantee in this way: always be marked with liquid in the dampening chamber, wherein liquid flows into by this passage and can be flowed out by dampening chamber again along the annular space.Another advantage is, the fluid pressure in the dampening chamber be higher than boiling pressure and thus liquid can not have the existence of gas ground.Guaranteed the damping function of dampening chamber in this way.
When shut-off block was configured to sleeve-shaped and leads on a guide finger, shut-off block preferably had one and is configured to the sealing surface or the sealing the margin of annular and has constant inner diameter on its whole length.Because be in the inboard that fuel under the system pressure only acts on shut-off block, radial pressure only occur by constant inner diameter.Thus shut-off block be isostasy and need not to overcome and be used to open and any pressure of off switch valve.Thus in order to realize the snap switch of switch valve, as long as little switch force is just enough.
Description of drawings
A form of implementation of the present invention is expressed to reach in the accompanying drawings and describes it in the following description in detail.
Unique accompanying drawing represents to have the fuel injector of the switch valve that constitutes according to the present invention.
Concrete form of implementation
This unique accompanying drawing represents to have the view of the summary of the fuel injector of the switch valve of formation according to the present invention.
Fuel injector 1 comprises that is sprayed a valve member 3, by this injections valve member can be used in the firing chamber that injects fuel into an internal-combustion engine, unshowned here spray-hole release or close.Spraying valve member 3 leading in a valve piece 5 reaches with control room 9 of 7 qualifications, a upper-end surface.The fuel that is under the system pressure is injected by an input throttle valve 11 in control room 9.Input throttle valve 11 makes control room 9 be connected with a doughnut 13, and this doughnut surrounds valve piece 5 and itself to be passed through an input channel 15 and be connected with unshowned high pressure accumulator here.By be in the control room 9 fuel under the system pressure, act on pressure on the end face 7 that sprays valve member 3 and this injections valve member be engaged in reach on the unshowned here valve seat and closed at least one spray-hole thus.
In order to discharge at least one spray-hole, make control room 9 releases.Open switch valve 17 for this reason, discharged thus by connection and the fuel of discharge route 19 and can flow out by control room 9 to fuel backflow part 21.Pressure in the control room 9 descends and sprays valve member 3 by lifting on its valve seat and discharging spray-hole.In order to reduce pressure surge, structure has a throttle part 23 in discharge route 19.
For the end injection process, switch valve cuts out the connection from discharge route 19 to backflow part 21.The fuel that is under the system pressure flows into control room 9 by input throttle valve 11, and the pressure in the control room 9 is risen.Increase by pressure makes sprays valve member 3 and is engaged on its valve seat again and closes at least one spray-hole.
The closing movement that sprays valve member 3 is subjected to the support of spring members 25.Spring members 25 is preferably one and constitutes helical spring stage clip.
The valve piece 5 that injection valve member 3 is directed to therein is installed on the case of sprayer 29 by a valve turnbuckle 27.
The switch valve of opening and cutting out 17 that is used for controlling the fuel injector of the firing chamber that injects fuel into internal-combustion engine comprises a shut-off block 31.Shut-off block 31 has a sealing the margin 33, and in order to close, the sealing edge mate is on a valve seat 35.A sealing surface is set also convertiblely replaces sealing the margin 33.
Switch valve 17 is isostasies in the form of implementation shown in the figure.Sealing the margin 33 is configured to annular.Shut-off block 31 has a constant inner diameter 37 in addition.The pressure that is in the fuel under the system pressure in this way only acts on the shut-off block 31 diametrically.Therefore on opposed of shut-off block 31, always act on identical pressure.
Tilt or slip diametrically for fear of shut-off block 31, this shut-off block leads on a guide finger 39.Guide finger terminates in the top of discharge route 19 and defines a pressure chamber 43 with shut-off block 31 thus with its lower end surface 41.One side of guide finger 39 usefulness itself and pressure chamber 43 opposition is close on the case of sprayer.With avoiding moving of guide finger 39 in this wise, promptly this guide finger is pressed on the case of sprayer with a spring members 45.This spring members 45 is the helical spring of a formation stage clip preferably.Spring members 45 usefulness one side acts on the part 47 of an expansion of guide finger and acts on the shut-off block 31 with opposite side.
Shut-off block 31 also is connected with an armature 49.Armature 49 and an electromagnet assembly 51 cooperatively interact, by they operating switch valves 17.Electromagnet assembly 51 generally includes the coil 53 and the iron core 55 that surrounds coil 53 that play the electromagnet effect.
In order to begin course of injection, must open switch valve 17.Make coil 53 galvanizations for this reason.Form a magnetic field thus, armature 49 is reached by this magnetic field suction and moves on the direction of electromagnet assembly 51.Because armature 49 is connected with shut-off block 31, this magnetic field also upwards attracts shut-off block 31.Shut-off block 31 is by lifting on the valve seat 35 and having discharged from discharge route 19 by the connection of low pressure chamber 57 to backflow part 21.Avoid the vibration of armature 49 in the case like this, promptly between armature 49 and electromagnet assembly 51, constitute a top clearance 59.This top clearance 59 is injected into the fuel that is contained in the low pressure chamber 57.Fuel in the top clearance 59 is compressed and the motion of damping armature 49 thus.
What fuel passed through to be discharged is flowed out by control room 9 to the connection of the part that refluxes through low pressure chamber 57 from discharge route 19.Pressure in the control room 9 descends.The pressure that acts on the upper-end surface 7 of spraying valve member 3 is descended.Spray valve member 3 by at least one spray-hole that lifts and discharge thus fuel injector 1 on its valve seat.Fuel promptly is injected in the firing chamber of internal-combustion engine.
For the end injection process, spraying valve member 3 must be coupled on its valve seat again, so that close spray-hole.Switch valve 17 must at first cut out the connection from discharge route 19 to backflow part 21 for this reason.Finish the energising of coil 53, magnetic field promptly disappears for this reason.Owing to act on the spring force of the spring members 45 on the shut-off block 31, shut-off block 31 is pressed on the valve seat 35 up to sealing the margin 33 towards the direction motion of valve seat 35.The fuel that is under the system pressure flows into control room 9 by doughnut 13 by input throttle valve 11.Pressure in the control room 9 increases and the pressure that acts on the upper-end surface 7 of spraying valve member 3 is increased.Because spraying on the upper-end surface 7 of valve member 3 increased pressure makes and sprays valve member 3 and be pressed on its valve seat again and close at least one spray-hole thus.Course of injection is accused to finish.
For resilience that prevents shut-off block 31 and the wearing and tearing that reduce valve seat 35 simultaneously, shut-off block 31 is surrounded by a sleeve pipe 61.Structure has a upper-end surface 63 on sleeve pipe 61.The upper-end surface 63 of sleeve pipe 61 is positioned at the opposite of an end face 65 of shut-off block 31, thus between the end face 65 of the upper-end surface 63 of sleeve pipe 61 and shut-off block 31 gap of formation.The upper-end surface 63 of sleeve pipe 61 is also sealed in this wise by a ring edge 67, thus between the outside of the inboard of ring edge 67 and the end face 65 of shut-off block 31 annular space 69 of formation.Between the end face 65 of the upper-end surface 63 of sleeve pipe 61 and shut-off block 31 and ring edge 67, surround a dampening chamber 71 in this way.This dampening chamber 71 is injected into liquid.
When switch valve 17 is opened, at first shut-off block 31 motions, so that the volume of dampening chamber 71 increases.This will cause the pressure in the dampening chamber 71 to descend.Because may owing to: liquid is incompressible basically, and a very little volume-variation just causes very strong variation in pressure.The variation of this pressure will cause: sleeve pipe 61 is with the direction motion of shut-off block towards electromagnet assembly 51.The position of sleeve pipe 61 relative shut-off blocks 31 does not change.
Shut-off block 31 and sleeve pipe 61 move towards the direction of valve seat 35 again when switch valve 17 cuts out.Formed a top clearance at sleeve pipe 61 and it between the supporting surface on the valve piece 5, this top clearance makes the impact of sleeve pipe 61 be subjected to damping.Eliminated the major part of impact momentum in this way.Shut-off block 17 continues motion in the case, so that it extend in the dampening chamber 71 with its end face 65.The volume of dampening chamber 71 diminishes.Make contained liquid compression in the dampening chamber 71 thus.The motion of shut-off block 31 is subjected to damping.Because their relative position, shut-off block 1 and sleeve pipe 61 stop side by side.In case shut-off block stop, sealing the margin 33 are pressed on the valve seat 35 and make the connection closed of discharge route 19 to backflow part 21.Because by this pass closed procedure be eliminated in the momentum moment before backstop tight to the valve seat 35 of closing of needle, prevented the resilience of shut-off block thus.
The closing movement of sleeve pipe 61 is subjected to the support of spring members 83.Spring members 83 is an effect that constitutes helical spring stage clip and play the retaining spring of sleeve pipe 61 preferably.Spring members 83 usefulness one sides act on widening on the part 85 and acting on the armature 49 with its opposite side of sleeve pipe 61 for this reason.Sleeve pipe 61 is pressed in above the valve piece 5.
At structure on the guide finger 39 targeting part 73 and a following targeting part 75 on one are arranged.Shut-off block 31 reaches targeting part 73 leadings down along last targeting part 75.Between last targeting part 73 and following targeting part 75, constitute a doughnut 77.This doughnut 77 is as leaking collecting chamber.Fuel is squeezed into as leakage rate by targeting part 73 under 43 edges, pressure chamber and leaks collecting chamber 77.Because the high pressure of fuel in the pressure chamber 43, the fuel pressure in the doughnut 77 is higher than the fuel pressure in the low pressure chamber 57.Doughnut 77 is connected with dampening chamber 71 by a passage 79.Fuel flows into dampening chamber 71 by passage 79.Can guarantee thus: be marked with liquid in the dampening chamber 71 all the time.Because the high pressure of liquid in the doughnut 77 also can be avoided the formation of bubble in the dampening chamber 71 simultaneously.
Passage 79 is preferably made by laser beam drilling or by corroding.
For the damping function that makes dampening chamber 71 can not become invalid owing to doughnut 77 and dampening chamber 71 hydraulic pressure by passage 79 is connected, then require targeting part 73 down and go up the throttling action at targeting part 75 places more much smaller than the throttling action at 69 places, annular space.
For be pressed in when sleeve pipe 61 valve piece 5 above the time can not close connection from discharge route 19 to backflow part 21 yet, structure has a passage 87 in sleeve pipe, fuel can be flow in the low pressure chamber 57 by this passage by pressure chamber 43 under the situation that switch valve 17 is opened.
Before pressure edge 33 impacts on the valve seat 35, begin remainder stroke that shut-off block 31 is subjected to damping from it and provide by the height h1 of sleeve pipe 61 and the end face 65 of shut-off block 31 and the distance h 2 between the sealing the margin 33.These two amounts h1 and h2 can very accurately measure, and are ground and are made into.Can be measured before sparger 1 assembling and may accurately be regulated by selecting combo by the lap that the difference of the end face 65 of the height h1 of sleeve pipe 61 and shut-off block 31 and the distance h 2 between the sealing the margin 33 provides, this lap has been determined described remainder stroke.Because and the manufacture h1 and the h2 that have nothing to do between the parts, just no longer need that must under assembled state, measure and proofread and correct, bothersome adjusting program.The reason of regulating program simplification also is: two amount h1 and h2 are all at identical reference point, and promptly valve seat 35.This on sparger according to the present invention owing to: valve piece 5 has the surface of plain grinding, and this surface constitutes valve seat 35 and carrying sleeve 61 thereon on the other hand on the one hand.
Another advantage of the switch valve 17 that constitutes according to the present invention is, the volume of dampening chamber 71 does not have influence to its function, because described liquid-and during as fuel injector fuel-under the situation of the medium and small pressure level of backflow part, can be regarded as incompressible at sparger.
Claims (11)
1. be used for sparger, be particularly useful for the switch valve of fuel injector (1), comprise a shut-off block (31), can make a control room (9) release by this shut-off block, spray valve member (3) with operation, wherein said shut-off block (31) is controlled by a solenoid actuated device that comprises electromagnet assembly (51) and armature (49), it is characterized in that: described shut-off block (31) is connected in this wise with a backstopping assembly, so that this backstopping assembly and described shut-off block (31) surround a dampening chamber (71), wherein said dampening chamber (71) be marked with liquid and when described shut-off block (31) moves the amount of liquid in the described dampening chamber (71) keep constant basically, make described shut-off block (31) move with described backstopping assembly.
2. according to the switch valve of claim 1, it is characterized in that: described backstopping assembly is configured to a sleeve pipe (61).
3. according to the switch valve of claim 2, it is characterized in that: described shut-off block (31) is directed in described sleeve pipe (61), wherein one of described sleeve pipe (61) on the direction of described electromagnet assembly (51) upper-end surface (63) and the end face (65) on the opposite, described upper-end surface (63) that is positioned at described sleeve pipe (61) of described shut-off block (31) between constitute described dampening chamber (71).
4. according to the switch valve of claim 3, it is characterized in that: the upper-end surface (63) of described sleeve pipe (61) is sealed in this wise by a ring edge (67), so that the outside of the end face (65) of the inboard of described ring edge (67) and described shut-off block (31) constitutes an annular space (69) at described switch valve (17) when closing and under the buttoned-up situation of described switch valve (17).
5. according to the switch valve of one of claim 1 to 4, it is characterized in that: the described relatively shut-off block of described sleeve pipe (61) (31) can move in the axial direction.
6. according to the switch valve of claim 5, it is characterized in that: be configured with the enlarged (85) of a dish type on described sleeve pipe (61), a spring members (83) is supported on this dish type of described sleeve pipe (61) with a side enlarged (85) goes up and is supported on the described armature (49) with opposite side.
7. according to the switch valve of one of claim 1 to 6, it is characterized in that: described shut-off block (31) is configured to sleeve-shaped and is directed on a guide finger (39).
8. according to the switch valve of claim 7, it is characterized in that: on described guide finger (39), be configured with a doughnut (77) between a targeting part (75) and the following targeting part (73) on of described shut-off block (31).
9. switch valve according to Claim 8, it is characterized in that: respectively form leakage-gap by described upward targeting part (75) and described targeting part (73) down, so that described upward targeting part (75) and described targeting part (73) down play the effect of voltage divider, and the pressure in the described doughnut (77) can be regulated by the described described gap size of targeting part (73) down of reaching of targeting part (75) of going up.
10. it is characterized in that according to Claim 8 or 9 switch valve: described doughnut (77) by the passage (79) in the described shut-off block (31) and described sleeve pipe (61) upper-end surface (63) and the described dampening chamber (71) between the end face (65) of described shut-off block (31) be connected.
11. the switch valve according to one of claim 7 to 10 is characterized in that: described shut-off block (31) has one and is configured to the sealing surface or the sealing the margin (33) of annular and has constant inner diameter (37) on its whole length.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007059265.7 | 2007-12-10 | ||
| DE200710059265 DE102007059265A1 (en) | 2007-12-10 | 2007-12-10 | Switching valve for injectors |
| PCT/EP2008/065591 WO2009074426A1 (en) | 2007-12-10 | 2008-11-14 | On-off valve for injectors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101896715A true CN101896715A (en) | 2010-11-24 |
| CN101896715B CN101896715B (en) | 2012-07-04 |
Family
ID=40243768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801201424A Expired - Fee Related CN101896715B (en) | 2007-12-10 | 2008-11-14 | On-off valve for injectors |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2229527B1 (en) |
| CN (1) | CN101896715B (en) |
| DE (1) | DE102007059265A1 (en) |
| WO (1) | WO2009074426A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009029009A1 (en) * | 2009-08-31 | 2011-03-03 | Robert Bosch Gmbh | Injector for injecting fuel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19650865A1 (en) | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | magnetic valve |
| DE10122168A1 (en) | 2001-05-08 | 2002-11-14 | Bosch Gmbh Robert | Solenoid valve for controlling an injection valve of an internal combustion engine |
-
2007
- 2007-12-10 DE DE200710059265 patent/DE102007059265A1/en not_active Withdrawn
-
2008
- 2008-11-14 CN CN2008801201424A patent/CN101896715B/en not_active Expired - Fee Related
- 2008-11-14 WO PCT/EP2008/065591 patent/WO2009074426A1/en active Application Filing
- 2008-11-14 EP EP08859206A patent/EP2229527B1/en not_active Not-in-force
Also Published As
| Publication number | Publication date |
|---|---|
| EP2229527A1 (en) | 2010-09-22 |
| EP2229527B1 (en) | 2013-03-13 |
| CN101896715B (en) | 2012-07-04 |
| DE102007059265A1 (en) | 2009-06-18 |
| WO2009074426A1 (en) | 2009-06-18 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20201114 |