• 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 method for gas nitriding a high-pressure accumulator (rail) for common-rail injection systems of internal combustion engines, in which an internal thread of the wall of the high-pressure accumulator passing through inlet or outlet opening is covered during fumigation, a cover screw is screwed into the thread to cover the thread ,
    公开号:AT510420A4
    申请号:T508/2011
    申请日:2011-04-08
    公开日:2012-04-15
    发明作者:
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    08/04 201 1 13 03 FAX + 431533S250. **. . ** l} Aff4 + € R. * KESCHERN @ 004/0 1 2 1
    The invention relates to a method for gas nitriding high-pressure components, in particular a high-pressure accumulator (rail) for common-rail injection systems of internal combustion engines, in which an internal thread of the inlet or outlet opening passing through the wall of the high-pressure component is covered during the fumigation.
    High pressure components such as e.g. High-pressure accumulators are used in common-rail injection systems for internal combustion engines. In such injection systems fuel is fed by means of a Vorförderpunpe optionally via a fuel filter and fuel lines at least one cooking pressure pump, where the fuel is compressed to system pressures of higher than 1400 bar, in particular up to 2200 bar. The compressed fuel passes via high-pressure lines ir. At least one high-pressure accumulator (rail). Starting from the high-pressure accumulator, the fuel reaches the individual Eir injection nozzles via a flow restrictor and via further high-pressure lines.
    In view of the high system pressure of up to 2200 bar, the high-pressure components and in particular the high-pressure accumulator are subject to extremely high mechanical loads.
    It is therefore necessary to subject certain high-pressure components to a hardening treatment, as a rule by gas nitriding. Gas nitriding is a thermochemical treatment in which the workpiece to be treated is heated and, during the heating time as well as during the treatment time, a nitrogen-containing gas, e.g. Is exposed to ammonia. The diffusion of nitrogen causes nitrides to form in the surface layer of the workpiece. Through the nitrogen: 08/04/2011 13:13
    No .: R474 P.004 / 012 t 08/04 2011 13:02 FAX -4315339250 WFIJEjl ** KE ££ HIMNN 0005/012 2 in the surface layer, the service properties, in particular the strength behavior under static and dynamic load, the wear behavior and improves the corrosion behavior. The advantage here is that at treatment temperatures of below 600 ° C can be worked so that a structural transformation of the material is avoided.
    However, nitriding also leads to an increase in the brittleness of the treated high-pressure component. This leads, in particular in the area of the threads, to a reduction in the fatigue strength of the thread and, as a consequence, to a deterioration in the strength of the corresponding threaded connection and in the tightness of the respective high-pressure connection. To remedy this situation, it has already become known to cover threads prior to nitriding in order to maintain the toughness of the material on the thread. For masking a masking paste is usually used. However, the use of a masking paste is cumbersome, especially because the masking paste must be removed again consuming after performing the nitriding.
    There are also methods known that auskontnen without covering the thread. Here, the high-pressure component is nitrided before the thread in the zu-or. Drain opening is cut. However, this requires an additional processing step, so basically the previously described methods with covering the thread before nitriding are to be preferred. 08/04/2011 13:13
    N °: R474 P.005 / 012 0 00G / 012 08/04 2011 13:03 FAX +4315339250 3
    The present invention therefore seeks to provide an alternative method of covering the thread, which is simple and inexpensive to perform.
    To solve this problem, the method of the type mentioned is inventively carried out such that for covering the thread a cover screw is screwed into the thread. This eliminates the costly loading and unloading of a masking paste. The cover screw is doing after deir. Nitriding again unscrewed and can be easily reused for nitriding other high pressure components.
    In order to seal the thread on the inside against the Niuriergas, it is preferred that the cover screw has a projecting sealing edge which is screwed against a radially outwardly of a sealing cone of the inlet and outlet opening arranged stop surface. The fact that the sealing cone of the cover screw rests radially outside of the sealing cone on the stop surface, it is achieved that the further inside than the stop surface lying sealing cone itself is not sealed against the nitriding gas and thus the nitriding treatment is subjected.
    In order to seal the thread at the same time outside against the nitriding, it is preferably provided that after screwing the cover screw, a further cover screw is used, which is screwed with its projecting sealing edge against a thread surrounding the flat surface of the high-pressure accumulator. 08/04/2011 13:14
    No .: R474 P.006 / 012 08/04 2011 13:04 FAX +4315338250. * . •• ÖAW ^ ER. * MÄCH ^ NN ® 007/01 2 4
    The use of two separate cover screws serves to avoid a double fit, wherein it is provided in particular that the cover screw and the further cover screw in the screwed state have an axial distance from each other.
    In order to use the cover screw (r.) Several times, a suitable choice of material is important. A preferred embodiment provides that the cover screw and possibly the further cover screw made of a temperature-resistant and elastic material, such. a copper beryllium alloy exists.
    The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. In this an end region of a high-pressure accumulator 1 is shown schematically. The Hcchdruckspeicher 1 has an inlet or Ablauföffr.ur.g 2, which opens via a sealing cone 3 in the inner 4 of the Hcchdruckspeichers 1. The sealing cone 3 in this case serves to bear a conical seat surface of a screwed into the inlet or outlet opening 2 high-pressure line, which is correspondingly designated thread 5. In order to prevent the thread 5 from being exposed to the nitriding gas during gas nitriding, a cover screw 6 is screwed into the thread 5 before the beginning of the nitriding treatment. The cover screw 6 has on its end face on an annular or circular sealing edge 7, which is pressed against the radial abutment surface 8 when screwed. The cover screw 6 is in this case screwed in with such a torque that results in a sufficient for the sealing of the thread 5 contact pressure of the sealing edge 7 against the stop surface 6. The radial stop surface fl closes out 08/04/2011 13:14
    No .: R474 P.007 / 01 2 08/04 2011 1304 FAX +4315339250
    @ 008/012
    UATTTJE ^ · «K £ ££ HUANN
    5 towards the sealing cone 3, so that in the sequence led into the interior 4 of the high-pressure accumulator 1 nitriding gas can also reach the sealing cone.
    After screwing in the cover screw 6, the further Abdeckchraube 9 is screwed into the thread 5, so that they formed with their on one edge of the inlet and outlet opening 2 cross-section formed sealing edge 10 against the edge of the inlet and outlet opening 2 surrounding lanfläche 11 is pressed. As a result, the thread 5 is sealed on the outside against the penetration of nitriding gas. The length of the cover screwdrivers. 6 and 9 is dimensioned so that the externally threaded portions of the respective screws are formed together shorter than the length of the internal thread 5. It arises in eir.geschraubten state of the cover screws £ and 9 som.it a distance a between the facing each other ,
    End faces of the cover screws.
    After the nitriding treatment, the cover screws 6 and 9 can be removed. 08/04/2011 13:14
    No .: R474 P.008 / 012
    权利要求:
    Claims (5)
    [1]
    08/04 2011 13 05 FAX +4315339250 © 009/012 < * e * &chäann::.;. * * * · :::: ·. 1. A method for gas nitriding high-pressure components, in particular a high-pressure accumulator (rail) for common-rail injection systems of internal combustion engines, in which an internal thread of the wall of the high pressure accumulator passing through inlet or outlet opening during the Gassing is covered, characterized in that for covering the thread a cover screw is screwed into the thread.
    [2]
    2. The method according to claim 1, characterized in that the cover screw has a projecting sealing edge which is screwed against a radially outwardly of a sealing cone of the inlet and outlet opening arranged stop surface.
    [3]
    3. The method of claim 1 or 2, characterized in that after screwing the cover screw, a further cover screw is used, which is screwed with its projecting sealing edge against a thread surrounding Plar.fiäche the high-pressure accumulator.
    [4]
    4. The method of claim 1, 2 or 3, characterized in that the cover screw and the further cover screw in the screwed state have an axial distance from each other.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the cover screw and possibly the further cover screw from a temperature-resistant and 08/04/2011 13:15 Nos .: R474 P. 009/012 08/04 2011 13: 05 FAX +4315339250, KiÄCHHiANN ** * .1 .. · * • · '* * ·· * •. , , ! * · @ 010/012 7 elastic material, e.g. a copper beryllium alloy exists. Vienna, 8 April 2011 Applicant by: Haffner and Keschmann Patentanwälte OG ui-.

    r.n 08/04/2011 13:15 No .: R474 P.010 / 012
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    同族专利:
    公开号 | 公开日
    US20140060705A1|2014-03-06|
    AT510420B1|2012-04-15|
    WO2012135884A1|2012-10-11|
    EP2694694A1|2014-02-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2014026846A1|2012-08-16|2014-02-20|Robert Bosch Gmbh|Thread connection for connecting components conducting high pressure medium|US4856954A|1988-05-18|1989-08-15|Buell Industries, Inc.|Method of thread masking and thread masked part|
    DE19948341A1|1999-10-07|2001-04-19|Bosch Gmbh Robert|High pressure fuel accumulator|
    DE10213661A1|2002-03-27|2003-10-16|Bosch Gmbh Robert|Process for producing a coating of a metallic substrate|
    DE10336745A1|2003-08-11|2005-03-10|Bosch Gmbh Robert|Carrier device for magnetizable substrates|
    US7021291B2|2003-12-24|2006-04-04|Cummins Inc.|Juncture for a high pressure fuel system|
    DE102005037549A1|2005-08-09|2007-02-15|Robert Bosch Gmbh|Coating for mechanically highly stressed components|
    US8006715B2|2007-09-20|2011-08-30|Caterpillar Inc.|Valve with thin-film coating|JP6392020B2|2014-07-31|2018-09-19|日産自動車株式会社|Bolt assembly and its carburizing method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA508/2011A|AT510420B1|2011-04-08|2011-04-08|METHOD FOR GASNITRATING HIGH-PRESSURE COMPONENTS|ATA508/2011A| AT510420B1|2011-04-08|2011-04-08|METHOD FOR GASNITRATING HIGH-PRESSURE COMPONENTS|
    US14/110,362| US20140060705A1|2011-04-08|2012-04-05|Method for gas-nitriding high-pressure components|
    PCT/AT2012/000095| WO2012135884A1|2011-04-08|2012-04-05|Method for gas nitriding high-pressure components|
    EP12716176.8A| EP2694694A1|2011-04-08|2012-04-05|Method for gas nitriding high-pressure components|
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