EP2156044A1 - Injector having a pressure-compensated control valve - Google Patents
Injector having a pressure-compensated control valveInfo
- Publication number
- EP2156044A1 EP2156044A1 EP08736614A EP08736614A EP2156044A1 EP 2156044 A1 EP2156044 A1 EP 2156044A1 EP 08736614 A EP08736614 A EP 08736614A EP 08736614 A EP08736614 A EP 08736614A EP 2156044 A1 EP2156044 A1 EP 2156044A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- diameter
- actuator
- injector
- sealing diameter
- 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
- 238000007789 sealing Methods 0.000 claims abstract description 56
- 239000000446 fuel Substances 0.000 claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 11
- 230000000284 resting effect Effects 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008092 positive 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
-
- 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
-
- 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
Definitions
- the invention relates to an injector for injecting fuel in a combustion chamber of an internal combustion engine, in particular a common rail injector according to the preamble of claim 1.
- Injectors with a pressure-balanced in the axial direction control valve are known in two fundamentally different designs. Due to the pressure balance of the control valve, such injectors are particularly suitable for switching high fuel pressures, in particular beyond 2000 bar.
- the actuator of the control valve is designed as a valve sleeve.
- the valve sleeve defines a valve chamber formed on a diameter-reduced portion of a guide pin only radially outward, so that act from the inside of the valve chamber located under high pressure fuel no forces in the axial direction on the valve sleeve.
- injectors are known in which the valve sleeve of the control valve is guided not on its inner circumference, but on its outer periphery.
- valve sleeve In one variant of these injectors, only a pressure pin which is pressurized in the axial direction is arranged inside the valve sleeve, which pushes the valve chamber provided inside the valve sleeve in an axial upward direction. seals. In this variant too, the high-pressure fuel within the valve chamber does not act on the valve sleeve in the axial direction.
- the valve chamber In another variant of the control valve with valve sleeve, the valve chamber is arranged radially outside the valve sleeve. When lifted from the valve seat valve sleeve, the valve chamber is connected via a channel formed by the valve sleeve with the low pressure region of the injector.
- the actuator is designed as a valve pin, wherein a valve chamber of the control valve is provided at a reduced diameter portion of the valve pin.
- This design of axially balanced control valves is characterized in that the effective in two opposite axial directions, the valve chamber limiting pressure application surfaces on the valve pin are the same size, so that the forces acting in the opposite axial directions compressive forces cancel each other.
- the invention is therefore based on the object to propose an injector, in which the wear effects on the opening and closing behavior are minimized.
- the sealing diameter of the actuator is less than 3 mm, at least immediately after production, ie before the use of the injector.
- Under sealing diameter in the context of the invention is understood to mean the valve seat fitting, the valve chamber directly limiting diameter of the actuator.
- the sealing diameter is chosen so that the sealing diameter does not exceed 3 mm also due to wear during operation of the injector.
- the provision of a sealing diameter of less than 3 mm has the advantage that the surface of a pressure stage which arises during operation is comparatively small, and consequently also the compressive force acting on the actuator in the opening direction. This is due in particular to the fact that the area of the resulting printing increases quadratically with increasing sealing diameter.
- control valves in the axial direction are understood in the sine of the invention also control valves, in which already in the production of a minimum pressure level, i. a one-sided pressure application surface is provided, for example in order to counteract a diameter step that arises as a result of wear, or to specifically generate a low opening force, in particular in order to be able to use actuators with lower power.
- a minimum pressure level i. a one-sided pressure application surface
- the sealing diameter ie the valve chamber on the valve seat directly limiting diameter of the actuator is selected from a range between 2.5 mm and 2.95 mm. Even more advantageous is the sealing diameter from a diameter range between about 1.5 mm and about 2.0 mm. Of particular advantage is an embodiment in which the sealing diameter is selected from a diameter range between about 1.0 mm and about 1.5 mm. Particularly advantageous effects on minimized wear have a sealing diameter ranging between about 0.5 mm and about 1.0 mm.
- the valve chamber on the opposite axial side limiting diameter of the actuator is also smaller than 3.0 mm.
- This diameter is either a guide diameter of the actuator, such as in an embodiment in which the actuator is formed as a valve sleeve and is guided on a radially inner guide pin, or in an embodiment in which the actuator is guided as in a valve piece Valve pin is executed.
- the guide diameter or the second sealing diameter of the actuator is selected from a range between about 2.5 mm and about 2.95 mm.
- the guide diameter or the second sealing diameter is selected from a range between about 2.0 mm and about 2.5 mm.
- Particularly advantageous is an embodiment with a guide diameter or a second sealing diameter from a range between about 1.0 mm and about 1.5 mm.
- a particularly preferred embodiment is formed with a guide diameter or a second sealing diameter from a range between about 0.5 mm to about 1.0 mm.
- the sealing diameter of the actuator resting against the valve seat is the same as that of the axially spaced guide diameter or the same as the second sealing diameter spaced in the axial direction.
- control valve is, at least immediately after production, a control valve which is completely pressure-balanced in the axial direction.
- a sealing diameter of less than 3 mm can be realized in a control valve in which the actuator is designed as a valve sleeve.
- the sealing diameter is the inner diameter of the valve sleeve, with which the valve sleeve rests against the valve seat, for example a conical seat.
- the valve sleeve is guided on its inner circumference on a guide pin, which is preferably formed integrally with a valve piece, which preferably carries the valve seat.
- a valve chamber is delimited in the axial direction by the sealing diameter (inner diameter of the valve sleeve) resting against the valve seat and by a guide diameter which is spaced apart in the axial direction and with which the valve sleeve is connected to the guide sleeve. bolt is guided.
- the guide diameter preferably corresponds to the sealing diameter.
- the outer diameter of the guide pin corresponds approximately to the inner diameter of the valve sleeve minus a minimum guide clearance.
- valve sleeve is guided on its outer circumference.
- a pressure pin is located inside the valve sleeve, wherein the inner diameter of the valve sleeve bearing against the pressure pin is a second sealing diameter (not the guide diameter).
- valve chamber is arranged on the outer circumference of the valve sleeve.
- sealing diameter of less than 3.0 mm is the outer diameter of the valve sleeve lying against the valve seat.
- the invention can be realized in an injector with a control valve whose actuator is designed as a valve pin.
- the sealing diameter preferably corresponds to the voltage applied to the valve seat outer diameter of the valve pin, which is preferably formed by a conical portion of the guide pin.
- the valve chamber of such a control valve is limited by a guide diameter (outer diameter) of the valve pin.
- the diameter of the valve pin within the valve chamber of the control valve is smaller, preferably by at least about 0.5 mm is smaller than the sealing diameter of the valve pin and thus also less than the guide sleeve diameter spaced apart in the axial direction of the valve pin.
- FIG. 1 shows a first possible embodiment of a control valve of an injector, in which the control valve has an actuator designed as a valve pin,
- FIG. 2 shows a second embodiment of a control valve for an injector, in which the actuator is designed as a guided on a guide pin valve sleeve,
- valve 3 shows a further embodiment of a control valve of an injector, in which the valve sleeve is guided on its outer circumference and
- FIG. 4 shows a further embodiment of a control valve with an axially adjustable valve sleeve, in which a valve chamber of the control valve is arranged on the outer circumference of the valve sleeve.
- a fragment designed as a common rail injector injector 1 for injecting fuel into a combustion chamber, not shown, of an internal combustion engine is shown.
- the injector 1 comprises an adjustable in the axial direction one or more parts valve element 2, which is adjustable between a closed position of the fuel flow from a nozzle hole arrangement not shown releasing opening position.
- the valve element 2 delimits with an upper end face 3 a control chamber 4 radially inside a sleeve 5.
- an inlet throttle 6 is introduced, via which the control chamber 4 is permanently supplied with high-pressure fuel.
- the control chamber 4 is connected via an introduced into a valve piece 7 outlet throttle 8 with a valve chamber 9 of a control valve 10.
- control valve 10 With the control valve 10 open, fuel can flow from the control chamber 4 into a low-pressure region 11 of the injector and from there to an injector return not shown.
- the flow cross-sections of the outlet throttle and the inlet throttle 6 are matched to one another such that when the control valve 10 is open, a net outflow of fuel from the control chamber 4 results, whereby the closing forces acting on the valve element 2 decrease and thus the valve element 2 from its valve seat (not shown) lifts off and releases the fuel flow into the combustion chamber. If the control valve 10 is closed, flows through the inlet throttle 6 continue to fuel in the control chamber 4, so that the pressure in the control chamber 4 and thus increase the force acting on the valve element 2 axial closing forces, so that the injection process is interrupted.
- the control valve 10 comprises an adjustable in the axial direction as a valve pin formed actuator 12, which is formed integrally with an anchor plate 13 in this embodiment.
- the armature plate 13 is part of an electromagnetic actuator, not shown, for opening the actuator 12.
- a closing spring 14 is provided to close the bolt-shaped actuator 12.
- the valve chamber 9 is partially formed within the valve member 7 and partially on a reduced diameter portion 15 of the actuator 12, wherein the pressure in opposite axial directions pressure application surfaces of the actuator 12 are equal.
- a valve seat 16 is formed for engaging a conical portion 17 of the actuator 12.
- the actuator 12 is located with a sealing diameter D on the valve seat 16.
- the sealing diameter D of about 2.5 mm is an outer diameter of the actuator 12 at its conical portion 17th
- the valve chamber 9 is delimited by a guide diameter D F of the actuator 12.
- the actuator 12 With the guide diameter D F , the actuator 12 is radially on the outside of a guide bore 18 in the valve piece 7 at.
- the amount of the management diameter D F corresponds to the amount of the sealing diameter D of the actuator 12th
- the lower end face 19 of the actuator 12 delimits a compensation chamber 20, which is connected to the low-pressure region 11 of the injector via a connecting channel 21, so that the pressure in the compensation chamber 20 during a displacement movement of the actuator 12 at least approximately constant.
- FIG. 2 shows an alternative exemplary embodiment of an injector 1, the basic mode of operation of the injector shown corresponding to the mode of functioning of the injector 1 according to FIG. 1.
- the actuator 12 is not formed as a valve pin, but as an axially adjustable valve sleeve 12, which is integrally formed with an anchor plate 13.
- the actuator 12 is guided radially inwardly on an axially extending guide pin 22, which is integral with a valve piece 7 is formed, on which also the valve seat 16 of the control valve 10 is located.
- the valve chamber 9 is formed on a reduced diameter portion 15 of the guide pin 22 and is supplied via an outlet throttle 8 with fuel from the control chamber 6.
- the sleeve-shaped actuator limits the control chamber 6 only radially on the outside and lies with a guide diameter D, which is formed by an inner diameter of the sleeve-shaped actuator 12 on the valve seat 16 at.
- the sealing diameter is in this embodiment about 2.3 mm.
- the sealing diameter D opposite the valve chamber 9 is limited by a guide diameter D F , which corresponds to the sealing diameter D.
- FIG. 3 corresponds in its operation to the embodiments of FIGS. 1 and 2.
- the sleeve-shaped actuator 12 is guided on its outer circumference, wherein in the valve member 7, an axial channel 23 is formed through which fuel can flow in the low-pressure region 11 of the injector when the actuator 12 is lifted from the valve seat 16.
- a pressure pin 24 which is supported in the axial direction on a holding body 25 of an electromagnetic actuator.
- the sleeve-shaped actuator 12 bears against the valve seat 16 with a sealing diameter D formed by an inner diameter.
- the valve chamber 9 is bounded on the opposite axial side by a second sealing diameter D2.
- the sealing diameter D and the second sealing diameter D 2 are each 2.8 mm.
- FIGS. 1 to 3 a further embodiment of an injector 1 is shown. Also in this injector 1, the basic operation corresponds to the injectors described in FIGS. 1 to 3.
- the actuator 12 is formed as a valve sleeve, wherein the valve seat 16 is formed on a valve member 7.
- the valve chamber 9 is arranged radially outside the valve sleeve 12, so that the sealing diameter D, with which the sleeve-shaped actuator 12 bears against its valve seat 16, is formed by an outer diameter of the actuator 12.
- the sealing diameter D is about 1.9 mm in this embodiment. Spaced in the axial direction of the sealing diameter D, the control chamber 9 is limited by a guide diameter D F of the sleeve-shaped actuator 12.
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710022587 DE102007022587A1 (en) | 2007-05-14 | 2007-05-14 | Injector with pressure compensated control valve |
PCT/EP2008/055204 WO2008138742A1 (en) | 2007-05-14 | 2008-04-29 | Injector having a pressure-compensated control valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2156044A1 true EP2156044A1 (en) | 2010-02-24 |
EP2156044B1 EP2156044B1 (en) | 2012-10-31 |
Family
ID=39705342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08736614A Active EP2156044B1 (en) | 2007-05-14 | 2008-04-29 | Injector having a pressure-compensated control valve |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2156044B1 (en) |
DE (1) | DE102007022587A1 (en) |
WO (1) | WO2008138742A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015211705A1 (en) * | 2015-06-24 | 2016-12-29 | Robert Bosch Gmbh | Fuel injector with control valve |
DE102016223287A1 (en) * | 2016-11-24 | 2018-05-24 | Robert Bosch Gmbh | Control valve for a fuel injector, fuel injector |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2336628A (en) * | 1998-04-24 | 1999-10-27 | Lucas Ind Plc | A fuel injector, for an I.C. engine, having a three way two position needle control valve |
DE10132249A1 (en) * | 2001-07-04 | 2003-01-23 | Bosch Gmbh Robert | Fuel injector with force-balanced control valve |
JP4019934B2 (en) * | 2002-12-26 | 2007-12-12 | 株式会社デンソー | Control valve and fuel injection valve |
DE602004004254T2 (en) | 2004-06-30 | 2007-07-12 | C.R.F. S.C.P.A. | Servo valve for controlling an injection valve of an internal combustion engine |
-
2007
- 2007-05-14 DE DE200710022587 patent/DE102007022587A1/en not_active Withdrawn
-
2008
- 2008-04-29 EP EP08736614A patent/EP2156044B1/en active Active
- 2008-04-29 WO PCT/EP2008/055204 patent/WO2008138742A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008138742A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2156044B1 (en) | 2012-10-31 |
DE102007022587A1 (en) | 2008-11-27 |
WO2008138742A1 (en) | 2008-11-20 |
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