• 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 producing a threaded connection between a first (6) and a second (5), respectively for high pressure medium provided component of an injection device for internal combustion engines, wherein an internal thread (21) on a tubular end portion (20) of the first component ( 6), into which the second component (5) having an external thread (22) can be screwed in and clamped against a bearing surface (24) of the first component (6), characterized in that an outer ring (26) bears against the tubular end portion (6). 20) is pressed, which applies an elastic, acting in the radial direction bias, and the components (5.6) are then screwed.
    公开号:AT512297A4
    申请号:T161/2012
    申请日:2012-02-07
    公开日:2013-07-15
    发明作者:
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    The invention relates to a threaded connection of high-pressure medium-conducting components of an injection device for internal combustion engines, wherein a first component at a tubular end portion has an internal thread and a second component an external thread screwed into the internal thread, wherein the second component when tightening the threaded connection with an end face against a support surface the first component is tensionable.
    The invention further relates to a method for producing such a threaded connection and a first component for such a threaded connection.
    Large storage volumes are necessary for common rail systems for large diesel engines for hydraulic reasons. This results - also for production reasons - large
    Sealing diameter for sealing the high pressure loaded components. With regard to the thread loading, these large sealing diameters are disadvantageous in screwed connections. On the one hand high preload forces must be used and on the other hand, the dynamic load on the thread is increased by the pulsating internal pressure load.
    A relief of the thread can currently be practicable and effective only by increasing the root radius - to reduce the notch effect - and by increasing the thread diameter - in the
    Power transmission area is increased - be achieved. Furthermore, through improved material quality, increased thread pitch, in particular with highly tempered screw connections, heat treatment techniques, thread production (final tempered - finish rolled) and "* * *· * · ♦ · · · ·· ··· · · * ·» · ···································································································································································· Geometrically, the use of tension nuts as well as threads with flank angle differences and large screw-in depths for fatigue strength can be helpful.
    However, all mentioned, operational measures are limited in their effect, especially when high preload forces are needed.
    The invention therefore aims to improve the fatigue strength of the threaded connection of high pressure medium leading components of an injection device for internal combustion engines in a simple manner.
    To solve this problem, the invention provides in a method of the type mentioned above, that an outer ring is pressed onto the tubular end portion, which applies an elastic, acting in the radial direction bias, and the components are then screwed.
    To solve this problem, the invention further provides in a threaded connection of the type mentioned above, that the first component carries an outer ring fixed externally by means of press fit on the tubular end portion.
    With the invention, the thread load is reduced by a targeted bias of the internal thread is applied by pressing an oversized outer ring on the outer surface of the tubular end portion. In order to achieve a targeted introduction of residual stresses and a targeted load change, the
    Pressing area preferably limited to the free end of the tubular end portion. Thereby, the normally highly stressed first thread, i. the thread adjacent the bearing surface, relieved by the underlying, stiffer and biased thread. The residual stresses also have a positive effect on the first thread turn.
    The stiffness and resilience of the pressed outer ring and the possible oversize have a limiting effect.
    However, pressures of at least 150 N / mm 2, in particular of about 200 N / mm 2 already show very good effect and are readily achievable. At the same time, make sure that the last thread is not overloaded. Depending on these factors, a 50% reduction in stress is possible depending on the base geometry.
    As an alternative to a compression bandage, a clearance fit can also be applied. The supporting effect reduces the thread tension in the first thread.
    A particularly advantageous application of the invention relates to an embodiment in which the first component is an integrated high pressure accumulator of a modular common rail injector and the second component is a holding body of the modular common rail injector.
    The invention will be explained below with reference to an embodiment schematically illustrated in the drawing. 1 shows the basic structure of a modular common rail injector, and FIG. 2 shows a detailed representation of the threaded connection of the holding body with the high-pressure accumulator.
    In Fig. 1, an injector 1 is shown, which has an injection nozzle 2, a throttle plate 3, a valve plate 4, a holding body 5 and a high-pressure accumulator 6, wherein a bolted to the holding body 5 nozzle retaining nut 7, the injection nozzle 2, the throttle plate 3 and the Valve plate 4 cohesion. In the idle state, the solenoid valve 13 is closed, so that high-pressure fuel from the high-pressure accumulator 6 via the high pressure line 8, the cross-connection 9 and the inlet throttle 10 flows into the control chamber 11 of the injection nozzle 2, the outflow from the control chamber 11 via the outlet throttle 12 but at the valve seat of the solenoid valve 13 is blocked. 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 holes 17 are closed. If the solenoid valve 13 is actuated, it releases the flow through the solenoid valve seat, and fuel flows from the control chamber 11 through the outlet throttle 12, the solenoid valve armature chamber and the low-pressure bore 18 back into the fuel tank, not shown. 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 19 is able to open the nozzle needle 15, which is displaceable longitudinally in the nozzle body, so that the spray holes 17 are released and an injection takes place.
    As soon as the solenoid valve 13 is closed, the drainage path of the fuel is blocked by the outlet throttle 12. Fuel pressure is re-established in the control chamber 11 via the inlet throttle 10 and generates an additional closing force which reduces the hydraulic force on the pressure shoulder of the nozzle needle 15 and exceeds the force of the nozzle spring 14. The nozzle needle 15 closes the way to the injection openings 17, wherein the injection process is terminated.
    Injection injectors of this type are used in modular Coromon rail systems, which are characterized in that a part of the existing storage volume 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 is not to be understood an ordinary line, but it is in a high-pressure accumulator to a pressure-resistant vessel with a Zu- or. Discharge 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.
    2 shows an enlarged view of the detail II of FIG. 1. The high-pressure accumulator 6 has a tubular end portion 20 which is provided with an internal thread 21. The holding body 5 is provided with an external thread 22 which cooperates with the internal thread 21 in the screwed into the high-pressure accumulator 6 state of the holding body 5. When tightening the screw, the conical end face 23 of the holding body 5 is stretched against the conical bearing surface 24 of the high-pressure accumulator 6, whereby a seal between the high pressure accumulator 6 and 5 holding body is achieved. In the braced state, the first thread 25 is subjected to the highest loads in conventional designs of the threaded connection.
    According to the invention, an outer ring 26 is now attached by means of a press fit at the free end of the tubular end portion 20. The interference fit is obtained in a conventional manner, e.g. By warming the outer ring 26 and subsequent shrinking onto the tubular end portion 20. The outer ring 26 causes a resilient bias of the tubular end portion 20 and the internal thread 21 in the radial direction, which leads to a strain relief of the first thread 25 when bracing the thread. The screw force is better distributed, so that the more remote from the support surface 24 threads are charged higher. The outer ring 26 is mounted in particular in the region of the last threads of the internal thread 21. The free end of the tubular end portion 20 has in the region of the support of the outer ring 26, a material taper in the radial direction, which preferably corresponds to the radial thickness of the outer ring 26.
    权利要求:
    Claims (11)
    [1]
    1. A method for producing a threaded connection between a first and a second, respectively provided for guiding high-pressure medium component of an injection device for internal combustion engines, wherein an internal thread is formed on a tubular end portion of the first component, in which the external thread having a second component can be screwed and clamped against a bearing surface of the first component, characterized in that an outer ring (26) is pressed onto the tubular end portion (20) which applies an elastic, acting in the radial direction bias, and the components (5.6) thereafter be screwed.
    [2]
    2. The method according to claim 1, characterized in that the outer ring (26) is pressed onto the free end of the tubular end portion (20).
    [3]
    3. The method according to claim 1 or 2, characterized in that the pressure between the outer ring (26) and the tubular end portion (20) is at least 150 N / mm2, preferably 200-250 N / mm2.
    [4]
    4. The method of claim 1, 2 or 3, characterized in that the first component is an integrated high pressure accumulator (6) of a modular common rail injector and the second component is a holding body (5) of the modular common rail injector.
    [5]
    5. Threaded connection of high-pressure-medium-carrying components of an injection device for internal combustion engines, wherein a first component has an internal thread on a tubular end section and a second thread can be screwed into the internal thread, the second Component is tightened when tightening the threaded connection with an end face against a support surface of the first component, characterized in that the first component (6) carries an externally by means of press fit on the tubular end portion (20) attached to the outer ring (26).
    [6]
    6. threaded connection according to claim 5, characterized in that the outer ring (26) at the free end of the tubular end portion (20) is fixed.
    [7]
    7. threaded connection according to claim 5 or 6, characterized in that the pressure between the outer ring (26) and the tubular end portion (20) is at least 150 N / mm2, preferably 200-250 N / mm2.
    [8]
    8. Threaded connection according to claim 5, 6 or 7, characterized in that the first component is an integrated high pressure accumulator (6) of a modular common rail injector and the second component is a holding body (5) of the modular common rail injector.
    [9]
    9. The first component for a threaded connection according to one of claims 5 to 8, wherein an internal thread is formed on a tubular end portion of the first component, in which a male thread having a second component is screwed and clamped against a bearing surface of the first component, characterized in that the first component (6) carries an outer ring (26) fastened to the tubular end section (20) externally by means of press fit ψψ.
    [10]
    10. The first component according to claim 9, characterized in that the outer ring (26) at the free end of the tubular end portion (20) is fixed.
    [11]
    11. First component according to claim 9 or 10, characterized in that the pressure between the outer ring (26) and the tubular end portion (20) is at least 150 N / mm2, preferably 200-250 N / mm2. Vienna, 7 February 2012 Applicant by: Haffner and Keschmann Patentanwälte OG
    类似技术:
    公开号 | 公开日 | 专利标题
    EP2626545B1|2014-10-29|Method for influencing the thread geometry of an internal thread for internal combustion engines
    AT509877B1|2011-12-15|DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE
    EP1403509A2|2004-03-31|Pressure limiting device and fuel system with such a pressure limiting device
    EP1554487A1|2005-07-20|Fuel injection device for an internal combustion engine
    AT509332B1|2011-08-15|PRESSURE PIPE FITTING
    EP2626546B1|2018-03-21|Threaded connection of high pressure medium conducting components of an injection device for internal combustion engines
    AT512162B1|2013-06-15|Locking pin with flow limiter
    WO2005066487A1|2005-07-21|Method for tightening a nozzle tensioning nut of an injector for fuel injection, and injector and nozzle tensioning nut
    AT508050B1|2011-09-15|DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE
    DE102009028262A1|2011-02-10|High pressure loaded component i.e. fuel injector, pressure resistance increasing method for self-ignition internal combustion engine, involves producing autofrettage pressure of seven kilo bars inside assembly group
    EP1339977B1|2005-03-23|Fuel-injection system for internal combustion engines
    WO2018050881A1|2018-03-22|Check valve, high-pressure component and high-pressure fuel pump
    WO2014026846A1|2014-02-20|Thread connection for connecting components conducting high pressure medium
    DE10309311B4|2005-01-05|Fuel high pressure storage
    EP1797314A1|2007-06-20|Fuel injector on an internal combustion engine
    WO2011042296A1|2011-04-14|Fuel injection valve and production thereof
    EP2807367B1|2015-10-14|Device for injecting fuel into the combustion chamber of an internal combustion engine
    EP1597473A1|2005-11-23|Fuel-injection device, in particular for internal combustion engines with direct fuel-injection
    AT510420B1|2012-04-15|METHOD FOR GASNITRATING HIGH-PRESSURE COMPONENTS
    AT512277B1|2013-07-15|Injector of a modular common rail fuel injection system with flow restrictor
    EP1319128A1|2003-06-18|Fuel injection valve for internal combustion engines
    DE102012213535A1|2014-01-02|Fuel injector has outer contour whose diameter on case inner surface is smaller than diameter of outer contour on case outer surface
    DE10300177A1|2004-07-22|Fuel injection device for internal combustion engine has wall section of valve element opposite fuel outlet arranged at least approximately parallel to housing wall near fuel outlet
    EP1387948A1|2004-02-11|Yield point-controlled threaded joint
    DE102010030396A1|2011-12-29|Fuel injector for injecting fuel into combustion chamber of internal combustion engine, has support body, where diameter in region of support body is larger than diameter of hole in region of valve plate
    同族专利:
    公开号 | 公开日
    EP2626546B1|2018-03-21|
    AT512297B1|2013-07-15|
    EP2626546A1|2013-08-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2009033304A1|2007-09-13|2009-03-19|Ganser-Hydromag Ag|Fuel injection device|
    AT509877A4|2010-11-02|2011-12-15|Bosch Gmbh Robert|DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE|
    DE10210282A1|2002-03-08|2003-09-25|Bosch Gmbh Robert|Device for injecting fuel into stationary internal combustion engines|
    EP1860363B1|2006-05-26|2011-12-21|Uponor Innovation AB|Pipe fitting|
    US9243728B2|2009-12-31|2016-01-26|Bilfinger Water Technologies, Inc.|Pipe with reinforced female end|DE102013226569A1|2013-12-19|2015-06-25|Robert Bosch Gmbh|Fuel injector and method of manufacturing a fuel injector|
    DE102014222815A1|2014-11-07|2016-05-12|Robert Bosch Gmbh|Fuel injector and method of manufacturing a fuel injector|
    EP3502460A1|2017-12-19|2019-06-26|Continental Automotive GmbH|Fastening connector for securing two components together|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA161/2012A|AT512297B1|2012-02-07|2012-02-07|THREAD CONNECTION OF HIGH-PRESSURE MEDIUM LEADING COMPONENTS OF AN INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINES|ATA161/2012A| AT512297B1|2012-02-07|2012-02-07|THREAD CONNECTION OF HIGH-PRESSURE MEDIUM LEADING COMPONENTS OF AN INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINES|
    EP13450005.7A| EP2626546B1|2012-02-07|2013-01-29|Threaded connection of high pressure medium conducting components of an injection device for internal combustion engines|
    [返回顶部]