• 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 plug (5) for an injector of a modular common rail fuel injection system comprising at least one high pressure fuel high pressure port (20), a bolt-like portion (4) insertable into an opening (3) of the injector having a first, preferably tapered, sealing surface (6) for high pressure sealing closure of the opening (3), the bolt - like portion (4) having a high pressure port (20) in hydraulic communication, opening into the injector high pressure bore (11), and a flow restrictor (16) for limiting the in The amount of fuel delivered to the injector, the bolt-like portion (4) on an insert (24), in which the flow restrictor (16) is formed and which carries the first sealing surface (6).
    公开号:AT512162A4
    申请号:T548/2012
    申请日:2012-05-08
    公开日:2013-06-15
    发明作者:
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    ! ♦ »» ϊ
    The invention relates to a closure pin for an injector of a modular common rail fuel injection system.
    Modular common rail systems are characterized by the fact that part of the storage volume present in the system is present in the injector itself. Modular common-rail systems are used in particularly large engines, in which the individual injectors may be mounted at a considerable distance from each other. The sole use of a common rail for all injectors is not useful in such engines, as it would come to a massive slump in injection pressure due to the long lines during injection, so with prolonged injection duration, the injection rate would noticeably break. In such engines, it is therefore intended to arrange a high-pressure accumulator inside each injector. Such a design is referred to as a modular structure, since each injector has its own high-pressure accumulator and thus can be used as a stand-alone module. Under a high-pressure accumulator this is not a common line to understand, but it is a pressure-resistant vessel with an inlet and outlet whose diameter is significantly increased compared to the high pressure lines, so that from the high-pressure accumulator a certain amount of injection can be delivered without causing an immediate pressure drop.
    Injectors of modular common rail systems, high-pressure fuel from a high-pressure pump is supplied, wherein the supply mostly via an opening of the injector at the top of the high-pressure accumulator (so-called
    Topfeed). The connection of the high-pressure fuel-carrying high-pressure line to the injector takes place via a provided with a high-pressure port closure pin, which has an insertable into the opening of the injector portion having a preferably tapered sealing surface for high-pressure sealing closure of the opening. This seals the volume of the high-pressure accumulator. The closure bolt usually has the further function of passing the fuel for the adjacent injectors, for which purpose a second high-pressure port is provided.
    A flow restrictor is integrated in the plug to isolate the injector from high pressure fuel flow when the flow rate is too high.
    For manufacturing reasons, the closure pin in the embodiment according to the prior art has a high-pressure bore continuous in the axial direction into which the high-pressure connection opens radially and via which the high-pressure fuel is conducted into the high-pressure accumulator. To the outside, the axial high-pressure bore is sealed by means of a screw plug.
    A disadvantage of the described design of the locking bolt is that its inner contour geometriebedingt is acted upon over the entire length of the full pressure of the high-pressure fuel, so that in terms of geometric design and the roughness high quality is required, which is difficult to achieve in the production. In particular, the difficult-to-fabricate geometries for the ♦ * * ··························································································. »«
    Flow restrictors are a problem. This means that a permanent design at system pressures of more than 1600 bar is no longer possible.
    The present invention therefore aims to avoid the disadvantages described above. Furthermore, the invention has the object to provide a construction which is easier to manufacture and with which it is possible to adapt the closing amount of the flow restrictor in a simple manner to the respective needs.
    To achieve this object, the closure bolt of the type mentioned, comprising at least one high-pressure connection for high-pressure fuel, a bolt-like, insertable into an opening of the injector portion with a first, preferably tapered sealing surface for high-pressure sealing the opening, wherein the bolt-like portion with the high pressure port in hydraulic connection, opening into the injector high-pressure bore, and a flow restrictor for limiting the amount of fuel delivered to the injector, according to the invention essentially designed such that the bolt-like portion has an insert in which the flow restrictor is formed and which carries the first sealing surface , The bolt-like portion of the locking bolt is thus formed at least in two parts, wherein the insert faces the high pressure accumulator and ensures the sealing of the high pressure accumulator with the first sealing surface. The fact that the flow restrictor is now arranged in this insert, the difficult to manufacture geometries of the flow restrictor are limited to the use, so that the "···" «" ♦ ♦ · · ·
    Basic body of the locking bolt is much easier to produce. In particular, the high pressure applied geometries of the body can be performed without manufacturing difficulties with the appropriate radii and surfaces. Furthermore, the two-part design means that the high-pressure bore of the locking bolt no longer has to extend through the entire locking pin, so that it is possible to dispense with the use of a locking screw, thereby reducing the risk of manipulation by unauthorized persons. A further advantage is that the insert can be exchanged in a simple manner with a constant basic body, so that a simple adaptation of the closing amount of the flow restrictor succeeds by providing a plurality of inserts with a different design of the flow restrictor.
    The insert does not have to have its own connection means to be connected to the base body. Rather, a preferred embodiment provides that the screwing of the base body with the injector body simultaneously provides the required holding force for use. The formation is preferably made for this purpose such that the insert has a shoulder with a second, preferably conical sealing surface, which cooperates with a counter surface of the bolt-like portion. The screwing of the locking bolt then brings the required sealing force on both sealing surfaces at the same time, namely at the first, between the injector body and the insert reaching the effective sealing surface and the second, between the insert and the body of the
    Locking bolt or the bolt-like portion to the effect reaching sealing surface. Preferably, the first and / or the second sealing surface is conical or conical.
    Advantageously, a particular subsequent to the shoulder axial portion of the insert is received in a receiving bore of the bolt-like portion.
    In this axial section, the flow restrictor may particularly preferably be arranged at least partially, as a result of which high fatigue strength can be achieved. This in particular if, as corresponds to a preferred development, the axial portion of the insert is received in the receiving bore, that it can be acted upon from the outside and from the inside with the pressure of the high-pressure fuel. As a result, a pressure balanced area is created, which is subjected to pressure oscillations to a much lesser extent. In particular, the pressure surges acting on the flow restrictor are minimized. In the pressure balanced region, the difficult to fabricate geometries of the
    Flow restrictor can be realized without further adversely affecting the fatigue strength. To achieve a pressure-compensated area of the recorded in the receiving bore portion of the insert is formed at least in its front region with respect to the rear, the high-pressure accumulator facing region slightly reduced outer diameter. Furthermore, the insert is designed so that a gap remains between its end face and the bottom of the receiving bore, so that the insert in the pressure-compensated region can be acted upon from the outside by high-pressure fuel.
    A preferred development further provides that the receiving bore at the transition into the high pressure bore has an annular bearing surface for the closing member, in particular the ball of the flow restrictor.
    In order to enable a subsequent flow of fuel into the high-pressure accumulator during the injection of fuel into the combustion chamber of the internal combustion engine and to prevent mutual interference of the injection pressure or the injection quantity of the individual injectors, it is preferably provided that the high-pressure bore via a throttle formed in the insert opens into the injector. The arrangement of the throttle in use brings with it the advantage that an adaptation of the throttle cross section to the respective needs in a simple manner by replacing the insert succeeds without the entire closure bolt would have to be replaced.
    In use, a rod filter is preferably arranged which retains coarse particles from the fuel.
    The invention will be explained in more detail with reference to embodiments shown schematically in the drawing. 1 shows an embodiment of the locking bolt according to the prior art and FIG. 2 shows an embodiment according to the present invention.
    In Fig. 1, an end portion of an injector body 1 is shown, in which a high-pressure accumulator 2 is integrated. The high-pressure accumulator 2 accommodating part is sometimes referred to as a holding body. The injector or holding body 1 has a leading to the high-pressure accumulator 2 opening 3, in which a bolt-like portion 4 of a
    Locking pin 5 is inserted. The bolt-like portion 4 has at the high-pressure accumulator 2 facing end face on a conical sealing surface 6, which cooperates with a corresponding counter-surface at the edge of the opening 3. The required holding force is applied by means of a clamping nut 7, which cooperates with its internal thread with axially adjoining external threads of the injector body 2 and the locking pin 5. Between the shoulder 8 of the
    Locking pin 5 and the annular end face 9 of the injector body 1, a gap 10 is provided to avoid a double fit.
    Furthermore, a closure bolt 5 axially passing through the high-pressure bore 11 is provided, which is closed on one side by means of a screw plug 12 and is on the other side via a throttle 13 with the high-pressure accumulator 2 in combination. The closure screw 11 has a central extension 14, which supports a ball 15 of the flow restrictor 16. The ball 15 is acted upon by means of a coil spring 17 in the direction of the extension 14. The valve seat of the flow restrictor 16 is designated by 18. The function of the flow restrictor 16 is as follows: With common rail systems, under unfavorable circumstances leaks may occur, be it in the piping system or due to defective injectors. Injectors with jamming nozzle needles, which lead to continuous injections into the combustion chamber, can cause considerable damage. These damages can lead to the fire of the vehicle or to the destruction of the engine. Flow rate limiters with a closing function serve to avoid these dangers which, when a maximum withdrawal quantity is exceeded, are prevented from being exceeded. 4 ♦ · · A · φ -φ φ φ • * · »· * · 9« · · ···· {♦ · ·· · • · ·· 9 Φ 9 * «9 *
    High pressure accumulator close the inlet to the affected injector and thus decouple the injection pump side high pressure from the injection valve side.
    1, the ball 15 is pressed in the bore 11 on a stop (extension 14) and moves through the resulting during injection flow due to the pressure difference at Kugelumströmung in the direction of the sealing seat 18. When a maximum injection quantity is exceeded The ball 15 goes into the seat 18 and prevents further flow into the injector, whereby a continuous injection is prevented.
    In the high-pressure bore 11, a rod filter 19 is further arranged. In the high-pressure bore 11 opens a radial line, which is equipped with a high pressure port 20. To the high pressure port 20, a line not shown is connected, via which the supply of high-pressure fuel from a high-pressure pump, not shown, takes place. The closure pin 5 has a further high-pressure port 21, via which a connection to a subsequent injector can be made.
    In the embodiment according to FIG. 1, the high-pressure bore 11 is subjected to the pressure of the high-pressure fuel during operation, which leads to an impermissible dynamic load at system pressures of more than 1600 bar in the region of the radii and the like required for the formation of the flow restrictor.
    In the embodiment according to the invention according to FIG. 2, the same reference numerals as in FIG. 1 are used for the same parts. The bolt-like portion 4 of the locking bolt 5 has a receiving bore 22 into which an axial portion 23 of an insert 24 is received. The insert 24 accommodates in the high pressure bore 11 the flow restrictor 16, the rod filter 19 and the throttle 13. The insert 24 has a shoulder 25 on which a conical sealing surface 26 is formed, which cooperates with a conical counter surface of the bolt-like portion 4. This results in that the screwing of the locking bolt 5 by means of the clamping nut 7 simultaneously generates a sealing force on the sealing surface 6 and on the sealing surface 26.
    The end face of the axial portion 23 terminates at a distance from the provided at the transition of the receiving bore 22 in the high-pressure bore 11 annular bearing surface 28. Further, the recorded in the receiving bore 22 axial portion 23 is formed in its front portion 27 with a reduced outer diameter, so that in the Resulting annular gap between the outer periphery of the front portion 27 of the axial portion 23 and the receiving bore 22, the pressure of the high-pressure fuel from the outside on the flow restrictor 16 can be effective. This results in a pressure compensated region of the flow restrictor 16, so that the vibration load is reduced.
    权利要求:
    Claims (10)
    [1]
    Claims 1. A closure plug for an injector of a modular common rail fuel injection system, comprising at least one high pressure fuel high pressure port, a bolt-like portion insertable into an opening of the injector and having a first, preferably tapered, sealing surface for high pressure seal closure of the orifice, the bolt like portion characterized in that the bolt-like portion (4) has an insert (24), in which the flow restrictor (A) connected to the high pressure port in hydraulic connection, opening into the injector high pressure bore, and a flow restrictor for limiting the amount of fuel delivered into the injector 16) is formed and which carries the first sealing surface (6).
    [2]
    2. Closure bolt according to claim 1, characterized in that the insert (24) has a shoulder (25) with a second, preferably conical sealing surface (26) which cooperates with a mating surface of the bolt-like portion (4).
    [3]
    3. Closure bolt according to claim 1 or 2, characterized in that an in particular to the shoulder (25) subsequent axial portion (23) of the insert (24) in a receiving bore (22) of the bolt-like portion (4) is accommodated.
    [4]
    4. closure bolt according to claim 3, characterized in that the flow restrictor (16) at least partially in the receiving bore (22) received axial portion (23) of the insert (24) is arranged.
    [5]
    5. closure bolt according to claim 3 or 4, characterized in that the axial portion (23) of the insert (24) is received in the receiving bore (22) that it can be acted upon from the outside and from the inside with the pressure of the high-pressure fuel.
    [6]
    6. closure bolt according to claim 3, 4 or 5, characterized in that the receiving bore (22) at the transition into the high-pressure bore (11) has an annular bearing surface (28) for the closing member, in particular the ball (15) of the flow restrictor (16) ,
    [7]
    7. closure bolt according to one of claims 1 to 6, characterized in that the high-pressure bore (11) via a in the insert (24) formed throttle (13) opens into the injector.
    [8]
    8. closure bolt according to one of claims 1 to 7, characterized in that in the insert (24) a rod filter (19) is arranged.
    [9]
    9. Injector of a modular common rail fuel injection system comprising a high-pressure accumulator (2) integrated in the injector body (1), which is closed by a closure pin (5) according to one of claims 1 to 8.
    [10]
    10. An injector according to claim 9, characterized in that the closure pin (5) and the injector body {1) by means of a clamping nut (7) are interconnected. Vienna, May 8, 2012 Applicant by: Haff Pat
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    JP2013234661A|2013-11-21|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2006114644A1|2005-04-28|2006-11-02|Man B & W Diesel Ltd|Fuel injector|
    WO2007009279A1|2005-07-18|2007-01-25|Ganser-Hydromag Ag|Accumulator injection system for an internal combustion engine|DE102019121156A1|2019-08-06|2021-02-11|Woodward L'orange Gmbh|Use for a flow control valve|GB8820706D0|1988-09-01|1988-10-05|Lucas Ind Plc|Fuel injection systems|
    DE9206268U1|1992-05-09|1993-09-09|Bosch Gmbh Robert|Fuel supply device for an injection nozzle|
    EP0839275A4|1994-12-06|2002-04-10|Cummins Engine Co Inc|Fuel metering check valve arrangement for a time-pressure controlled unit fuel injector|
    EP0780569B1|1995-12-19|2002-03-20|Nippon Soken, Inc.|Accumulator fuel injection device|
    DE19860476A1|1998-12-28|2000-07-06|Bosch Gmbh Robert|Fuel injection system|
    DE10210282A1|2002-03-08|2003-09-25|Bosch Gmbh Robert|Device for injecting fuel into stationary internal combustion engines|
    US6840268B2|2002-05-23|2005-01-11|Detroit Diesel Corporation|High-pressure connector having an integrated flow limiter and filter|
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    DE102005010738B4|2005-03-09|2013-11-07|Man Truck & Bus Ag|Flow limiting device|
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    EP2188516B1|2007-09-13|2011-10-26|Ganser-Hydromag AG|Fuel injection device|
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    AT509332B1|2010-06-22|2011-08-15|Bosch Gmbh Robert|PRESSURE PIPE FITTING|
    US8622046B2|2010-06-25|2014-01-07|Caterpillar Inc.|Fuel system having accumulators and flow limiters|
    US8596247B2|2010-07-13|2013-12-03|Caterpillar Inc.|Fuel delivery assembly|
    US8726884B2|2011-05-19|2014-05-20|Caterpillar Inc.|Quill assembly for a dual fuel common rail fuel system|WO2014131497A1|2013-03-01|2014-09-04|Ganser-Hydromag Ag|Device for injecting fuel into the combustion chamber of an internal combustion engine|
    DE102015220028A1|2015-10-15|2017-04-20|Robert Bosch Gmbh|Flow restrictor for one injector|
    DE102016206996B3|2016-04-25|2017-08-31|Continental Automotive Gmbh|Switching valve for a fuel injection system and high-pressure fuel pump|
    US20220065208A1|2020-09-03|2022-03-03|Caterpillar Inc.|Fuel flow limiter assembly having integral fuel filter and fuel system using same|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA548/2012A|AT512162B1|2012-05-08|2012-05-08|Locking pin with flow limiter|ATA548/2012A| AT512162B1|2012-05-08|2012-05-08|Locking pin with flow limiter|
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    JP2013097363A| JP6366900B2|2012-05-08|2013-05-07|Closing bolt for injector|
    CN201310240200.XA| CN103388545B|2012-05-08|2013-05-07|Closure bolt for injector|
    KR1020130051101A| KR102078521B1|2012-05-08|2013-05-07|Closure bolt for an injector|
    US13/890,043| US9279403B2|2012-05-08|2013-05-08|Closure bolt for an injector|
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