• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a device for injecting fuel into the combustion chamber of an internal combustion engine with a nozzle in an injector (2) axially displaceable nozzle needle (15), which dips into a fuel-pressurized control chamber (11) whose pressure on at least one or Drain port for fuel opening or closing control valve (4) is controllable, wherein the control valve comprises a in a valve body (5) guided valve needle (26) having a sealing surface which is pressed against a valve seat (13), the valve seat (13) on a Separate insert component (27) formed of wear-resistant material having a valve seat (13) leading high-pressure bore (28) and is secured by positive engagement against a caused by the applied high pressure axial displacement.
    公开号:AT512296A4
    申请号:T1172012
    申请日:2012-01-27
    公开日:2013-07-15
    发明作者:
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    27/01 2012 17:30 FAX * 4315339250 HAFENER & KESCHMANN @ 004/020 ···· «« · «« «« * * · · · ······· * ♦ ····· · · «1
    The invention relates to a control valve for an injection nozzle for injecting fuel into the combustion chamber of an internal combustion engine with a nozzle needle axially displaceable in the injection nozzle, which in t a fuel-feedable under pressure control chamber! immersed, the pressure of which is controllable via the at least one inlet or outlet channel for fuel opening or closing control valve, wherein the control valve comprises a guided in a valve body valve needle having a sealing surface which can be pressed against a valve seat.
    The invention further relates to a device for injecting fuel into the combustion chamber of a! Internal combustion engine comprising a control valve of the type mentioned above.
    Control valves of injectors for common rail systems for injecting high viscosity fuels into the combustion chamber of internal combustion engines are known in various forms. In the case of heavy oil, heating up to 150eC is required to achieve the necessary injection viscosity. With a high proportion of abrasive solids and high temperature i naturally increases the wear and thus affects the i1 reliability.
    I
    Basically, an injector for a common-rail injection system has different parts, which are usually held together by a nozzle retaining nut. The actual injector nozzle contains a nozzle needle, which is guided axially displaceably in the nozzle body of the injector nozzle and has a plurality of open spaces, through which from the 27/01/2012 16:40
    No .: R435 P.004 / 020 27/01 2012 17:30 FAX +4315339250 HAFFNER & KESCHMANN @ 005/020 * ♦ ··············· «····· * ♦ · t ········································································································································· The nozzle needle itself carries a collar on which a compression spring is supported, and immersed in a control chamber, which can be acted upon with fuel under pressure. An inlet channel can be connected to this control chamber via an inlet throttle and an outlet channel via an outlet throttle i, wherein the respective pressure built up in the control chamber together with the pressure spring, the nozzle needle
    I in! Holds the closed position. The pressure in the control room can
    I are controlled by a control valve, which is usually operated by an electromagnet. With appropriate wiring, an opening of the control valve can cause a drainage of the fuel via a throttle, so that a drop in the hydraulic holding force leads to the dipping into the control chamber end face of the nozzle needle for opening the nozzle needle. In this way, in the sequence of fuel through the injection openings in the
    Enter combustion chamber of the engine. i
    The invention now aims to provide an embodiment of such a control valve, which remains störungsunanfällig even at high temperatures and even with highly viscous oils and a high proportion of abrasive solids in the fuel and has an increased reliability even under extreme conditions.
    To achieve this object, the embodiment of the invention is such that the valve seat is formed on a separate insert member made of wear-resistant material having a high-pressure bore leading to the valve seat and is secured by positive engagement against a caused by the applied high pressure axial displacement. Thereby, the valve seat on a 27/01/2012 16:41
    No .: R435 P.005 / 020 27/01 2012 17:30 FAX +4315338250 HAFFNER & KESCHHANN @ 006/020 · «· · ·· t» «« «· ······················································································· If the separate insert component is designed, the valve seat can be manufactured relatively inexpensively from a particularly wear-resistant material. As a wear-resistant material is for example a ceramic or hard metal material or a special material in question, wherein the material in the region of the valve seat may be additionally coated in order to further improve the wear resistance.
    The separate insert component is in particular substantially cylindrical. The insert member may be formed, for example, as a sleeve. The separate insert component is preferably accommodated in the valve body or in a valve plate separate from the valve body. Preferably, the insert member is received in a bore of the valve body or the valve plate. The valve body or the valve plate can be made of conventional steel in a cost effective manner. The connection of the insert member with the valve plate or the valve body can be done by screwing, gluing, shrinking or pressing. In all cases, the invention provides that the insert member is secured by positive engagement against a caused by the applied high pressure axial displacement. This positive connection can in particular take place in that the insert component has a conical outer jacket which tapers towards the valve seat and which cooperates with a conical abutment surface of the valve body or the valve plate. But there are also other embodiments of a positive connection conceivable in which no conical design of the outer shell of the insert member is required. The stop surface can then be carried out, for example, plan. 27/01/2012 16:41
    No .: R435 P.006 / 020 27/01 2012 17:31 FAX * 4315339250 HAFFNER & KESCHNANN @ 007/020 ΨΨ · 4
    The invention particularly relates to a design of the control valve as a non-pressure balanced valve. In such an embodiment of the valve, the high pressure fuel acts in the opening direction on the valve closing member or the valve needle. Typical of such a design is that the valve seat surrounds the edge of the high-pressure bore formed in the insert part annularly. In particular, the valve seat separates a high-pressure region from a low-pressure region, the valve needle opening toward the low-pressure region.
    Non-pressure compensated control valves require high spring forces, high magnetic switching forces and a large space due to the dimensioning of spring and magnet. In contrast, pressure compensated valves typically require much smaller spring forces, hence smaller magnetic forces to effect an open, as well as smaller valve strokes, thus allowing faster shift times. By means of this type of solenoid valves, the multiple injection capability of fuel injectors can be improved. However, these pressure-balanced designed valves require a high pressure-tight guide and a linear extending sealing edge, which corresponds to the guide diameter of the valve member, which allows the pressure balance of the solenoid valve only.
    A critical factor in the case of the pressure-compensated solenoid valves is the fact that, in the course of their operating time, particulate-laden fuel sets wear on a sealing edge, which leads not only to leakage but also to undesired opening of the valve. This can be explained by the fact that in the case of pressure-balanced valves the force acting on the 27/01/2012 16:41
    No .: R435 P.007 / 020 27/01 2012 17:31 FAX +4315339250 HAFFNER & KESCHMANN 0008/020 · * t # M · «· · · · · ·
    «· ♦ * ··········································································································································································································································· is as with non-pressure compensated valves, since the closing spring force is smaller. The spring force in pressure-balanced valves only has to ensure that there is sufficient surface pressure for the tightness along the line contact at the seat. In the case of non-pressure compensated valves, the system pressure from below (maximum) must also be maintained by the spring force, so that significantly higher spring forces are required here. If wear now occurs on the sealing edge, e.g. as a result of " weft channels " due to particulate matter in the fuel, pressure balanced valves will result in " pressure infiltration ", resulting in an opening force on the valve member due to system pressure. This opening force component causes at longer running times a failure of the valve, as this reduces the surface pressure required for the tightness, until the valve seat is no longer tight and opens the valve without energizing the solenoid. This problem does not occur to this extent with non-pressure compensated valves, as a slight infiltration here produces an opening force component that is significantly smaller in relation to the existing spring force than with pressure compensated valves.
    The problems described above arise when using fuels with a particularly high proportion of abrasive solids, such as e.g. Heavy oil naturally reinforced.
    By using a non-pressure compensated control valve, the described problems can be avoided. 27/01/2012 16:42
    No .: R435 P.008 / 020 27/01 2012 17:31 FAX +4315333250 HAFFNER & KESCHMANN @ 009/020 ·· ·· * ························································· ··· ··· · φ | ········ # i 6
    A preferred embodiment provides that the insert component and the valve body or the valve plate frictionally, for. by means of a press fit, wherein the insert member has a tapered outer jacket to the valve seat, which cooperates with a conical abutment surface of the valve body or the valve plate.
    Preferably, the valve needle has a valve closure member with a spherical sealing surface, in particular with a valve ball.
    It is further advantageous if the insert member is flush with the valve body or valve plate on the opposite side of the valve seat and against an adjacent plate, such as the valve plate. a throttle plate is supported. The risk of such a displacement of the insert member occurs when, for example, during a warm-up operation, no pressure is applied to the control valve, but the valve needle is already hammering on the valve seat. | The invention will be explained in more detail with reference to embodiments shown schematically in the drawing. 1 shows the basic structure of an injector according to the prior art, FIG. 2 shows a first embodiment of the control valve according to the invention, and FIG. 3 shows a modified embodiment of the control valve according to the invention.
    Fig. 1 shows the schematic structure of a modular common rail injector according to the prior art. The injector 1 consists of an injection nozzle 2, a 27/01/2012 16:42
    No .: R435 P.009 / 020 27/01 2012 17:32 FAX +4315333250 HAFFNER & KESCHMANN @ 010/020 ·· ·· ·· ** «··« · * ······················· · # * · * # I · φ · 7
    Throttle plate 3 / designed as a solenoid valve control valve 4, a valve body 5, an injector body 6 and a nozzle retaining nut 7, which holds the parts together. In the idle state, the control valve 4 is closed so that high pressure fuel from the high pressure bore 8 via the transverse groove 9 and the inlet throttle 10 flows into the control chamber 11 of the nozzle 2, the outflow from the control chamber 11 via the outlet throttle 12 but is blocked at the valve seat 13 of the control valve 4 , The voltage applied in the control chamber 11 system pressure presses together with the force of the nozzle spring 14, the nozzle needle 15 in the nozzle needle seat 16, so that the injection nozzle 2 is closed.
    When the control valve 4 is operated by controlling the solenoid 17 and lifting the solenoid valve member out of the solenoid valve seat 13 against the force of the solenoid valve spring 19, the flow through the solenoid valve seat 13 is released and fuel flows out of the control chamber 11 through the drain throttle 12, Magnetventilankerraum 20, the drain column 21 and the low-pressure bore 22 back into the fuel tank. A equilibrium pressure defined in the control chamber 11 by the flow cross-sections of inlet throttle 10 and outlet throttle 12 is so small that the system pressure applied in the nozzle chamber 23 is able to open the nozzle needle 15 which is displaceable longitudinally in the nozzle body 24 so that the spray holes 25 are free be given and an injection takes place.
    Once the solenoid 17 is turned off, the armature 18 is pressed by the force of the solenoid valve spring 19 down and the valve needle 26 is pressed against the valve seat 13. In this way, the expiration of the 27/01/2012 16:42
    No .: R435 P.010 / 020 27/01 2012 17:32 FAX +4315339250 HAFFNER & KESCHMANN @ 011/020 fbi · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ft · ft · ftftftft · • «ft ft * ft * * 8
    Fuel locked by the outlet throttle 12. Via the inlet throttle 10 fuel pressure is again built up in the control chamber 11 and generates an additional closing force which reduces the hydraulic force to the pressure shoulder of the nozzle needle 15 and the nozzle spring 14 exceeds. The nozzle needle 15 closes the way to the injection openings 25, wherein the injection process is terminated.
    The embodiment of an injector shown in FIG. 1 is suitable in principle for low viscosity fuels. For highly viscous fuels, preheating is required, which requires heating temperatures of up to 150eC. Furthermore, highly viscous fuels usually also have a higher proportion of impurities, wherein in addition to the required heating of the fuel, heating of the solenoid valve by the control current 2U leads to excessive heating and possible destruction of the component. Fuel contaminants would lead after a short time to a pinching of the valve needle and excessive wear of the valve needle and the valve seat.
    The inventive design of the control valve 4 is now shown in Fig. 2. As far as components are concerned that have a functional equivalent in the basic structure of FIG. 1, the reference numerals used in FIG. 1 have been retained. Notwithstanding the embodiment according to FIG. 1, it can now be seen from the exemplary embodiment in FIG. 2 that the valve seat 13 is formed on a separate insertion component 27, which entirely consists of a wear-resistant material. The insert member 27 is in this case sleeve-shaped and has a for 27/01/2012 16:43
    No .: R435 P.011 / 020 27/01 2012 17:33 FAX +4315339250 HAFFNER & KESCHMANN @ 012/020 * · mm m * mm m mm mm m mm mm mm m m ··· * mm mm m · mm mmmm mmmm ··························
    Valve seat 13 leading high-pressure bore 28 on. The separate insert component is inserted into the valve plate 29, which may be made of a conventional material such as steel in particular. The insert component 27 is pressed into a bore 30 of the valve plate 29.
    In order to prevent the pressed-insert component 27 is moved in the direction of the valve needle 26 due to the upcoming high-pressure medium, the bore 30 in the valve body 5 facing portion a taper.
    The caused by the tapered reduced diameter of the bore 30 forms a particular conical stop surface for the insert member 27, wherein the insert member 27 has a correspondingly tapered outer sheath. Thus, the axial position of the insert member 27 is securely fixed, so that a defined distance between the valve seat 13 and the valve designed as a ball valve member 31 can be maintained even at pending high pressure. Alternatively, however, the abutment surface may also be made planar, so that no tapered outer sheath of the insert component 27 is required, as already mentioned, the insert component 27 may be made of a particularly wear-resistant carbide, and if excessive wear on the valve seat 13 is found to be cost-effective Replacement of the insert member 27, if necessary together with the valve needle 26 is possible.
    In the modified embodiment according to FIG. 3, the insert component 27 is not accommodated in a separate valve plate 29 but in a bore of the valve body 5. 27/01/2012 16:43
    No.: R435 P.012 / 020 27/01 2012 17:33 FAX +4315339250 HAFFNER 8 KESCHMANN ®013 / 020 t · · «« «99 9 ··» · • * 9 9 9 9 9 9 9 9 9 · • 999999 9 999999 9 9 9 10
    Apart from this difference, the construction corresponds to the embodiment of FIG. 2.
    3 that the valve seat 13 facing away from the end face 32 of the insert member 27 is flush with the end face 33 of the valve body 5. The flush termination can be achieved, in particular, by removing a possibly protruding region of the insert component 27 after the insert component 27 has been pressed into the bore of the valve body 5, and the end face 32 and the end face 33 are machined together. After assembly of the injector, the valve body 5 is supported with its end face 33 and 32 area on the throttle plate 3, which prevents the insert member 27 moves away from the valve needle 26. 27/01/2012 16:43
    No .: R435 P.013 / 020
    权利要求:
    Claims (11)
    [1]
    27/01 2012 17:33 FAX +4315339250 HAFFNER 8 KESCHMANN gj 014/020 ». • 1. Control valve for an injection nozzle for injecting fuel into the combustion chamber of an internal combustion engine with a nozzle needle axially displaceable in the injection nozzle, which dips into a fuel-pressurized control chamber whose pressure on the at least one inlet or outlet channel for fuel opening or closing control valve is controllable, wherein the control valve comprises a guided in a valve body valve needle having a sealing surface which can be pressed against a valve seat, characterized in that the valve seat (13) is formed on a separate insert member (27) made of wear-resistant material, the one to the valve seat (13) leading high pressure bore (Θ) and by positive engagement against a caused by the applied high pressure axi all moving is secured.
    [2]
    Second control valve (4) according to claim 1, characterized in that the separate Einsat2bauteil (27) in the valve body (5) is accommodated.
    [3]
    3. Control valve (4) according to claim 1, characterized in that the separate insert member (27) is received in a separate from the valve body (5) valve plate (29).
    [4]
    4. control valve (4) according to claim 1, 2 or 3, characterized in that the insert member (27) and the valve body (5) or the valve plate (29) non-positively, for example, by means of a press fit, are interconnected, wherein the Insert component (27) extends to the valve seat (13) 27/01/2012 16:44 No .: R435 P.014 / 020 27/01 2012 17:34 FAX +4315339250 HAFFNER & KESCHMANN®015 / 020 ···· Has a tapered conical outer jacket, which cooperates with a conical abutment surface of the valve body (5) or the valve plate (29).
    [5]
    5. Control valve (4) according to one of claims 1 to 4, characterized in that the control valve (4) is designed as a non-pressure compensated valve.
    [6]
    6. control valve (4) according to one of claims 1 to 5, characterized in that the valve seat (13) surrounds the edge of the in the insert member (27) formed high-pressure bore (8) annularly.
    [7]
    7. control valve (4) according to one of claims 1 to 6, characterized in that the valve seat (13) separates a high pressure region from a low pressure region, wherein the valve needle (26) opens to the low pressure region.
    [8]
    8. Control valve (4) according to one of claims 1 to 7, characterized in that the valve needle (26) has a valve closure member (31) with a spherical sealing surface, in particular with a valve ball.
    [9]
    9. control valve (4) according to one of claims 1 to 8, characterized in that the insert member (27) on the valve seat (13) opposite side flush with the valve body (5) or the valve plate (29) and against an adjacent Plate, such as a throttle plate (3) is supported.
    [10]
    10. Control valve (4) according to one of claims 1 to 9, characterized in that the insert component (27) from 27/01/2012 16:44 No .: R435 P.015 / 020 27/01 2012 17:34 FAX + 4315339250 HAFFNER S KESCHMANN 0013/020 • · + • *



    13 hard metal, ceramic or a special material, and preferably has a wear-resistant coating.
    [11]
    11. An apparatus for injecting fuel into the combustion chamber of a Brennkraftmasehine with a in an injection nozzle (2) axially displaceable nozzle needle < 155, which dips into a fuel-pressurized control chamber (11) whose pressure on at least one or Drainage channel for fuel opening or closing control valve (4) according to one of claims 1 to 10 is controllable. Vienna, 27 January 2012 Applicant to: Haffner and Kesehmann Patentanwälte OG | 27/01/2012 16:44

    No .: R435 . 016/020
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    同族专利:
    公开号 | 公开日
    WO2013111011A1|2013-08-01|
    AT512296B1|2013-07-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19955703A1|1998-11-19|2000-07-27|Cummins Engine Co Inc|Electromagnetically operated valve assembly|
    US20030010845A1|2001-07-13|2003-01-16|Carroll John T.|Rate shaping fuel injector with limited throttling|
    WO2010116221A1|2009-03-24|2010-10-14|Robert Bosch Gmbh|Device for injecting fuel into the combustion chamber of an internal combustion engine|
    DE102010003790A1|2010-04-09|2011-10-13|Robert Bosch Gmbh|Fuel injector for diesel engine, has actuator module controlling ball seat valve, where valve seat of ball seat valve arranged at valve plate is inserted into socket, which is inserted into valve plate and made of hard metal|DE202016103457U1|2016-06-29|2016-08-02|Samson Ag|Control valve|AT501668B1|2004-08-24|2007-03-15|Bosch Gmbh Robert|CONTROL VALVE FOR AN INJECTION NOZZLE|
    DE102006047294A1|2006-10-06|2008-04-24|Man Diesel Se|Fuel supply installation, particularly common-rail fuel supply installation of internal combustion engine, particularly ship diesel internal combustion engine, has low pressure area and pumping unit with high pressure pump|FR3064689B1|2017-03-31|2021-05-07|Delphi Int Operations Luxembourg Sarl|COMMON RAMP|
    法律状态:
    2017-09-15| MM01| Lapse because of not paying annual fees|Effective date: 20170127 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT1172012A|AT512296B1|2012-01-27|2012-01-27|VALVE PLATE / VALVE BODY WITH INPUT RESOLVED CONE OF CARBIDE|AT1172012A| AT512296B1|2012-01-27|2012-01-27|VALVE PLATE / VALVE BODY WITH INPUT RESOLVED CONE OF CARBIDE|
    PCT/IB2013/000317| WO2013111011A1|2012-01-27|2013-01-22|Valve plate/valve body with pressed-in conical sleeve composed of hard metal|
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