• 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 of influencing the thread geometry of an internal thread (21) of a first component (6) of an injection device for internal combustion engines provided for guiding high-pressure medium, wherein the internal thread (21) is formed on a tubular end section (20) of the first component (6) in which a second (5) component is screwed and clamped against a bearing surface (25) of the first component (6), the tubular end portion (20) on the outside with a plastic deformation permitting radial compressive force (27) is applied, whereby tubular end portion (20) is deformed such that the internal thread (21) receives a towards the free end continuously decreasing inner diameter (D).
    公开号:AT511801A4
    申请号:T162/2012
    申请日:2012-02-07
    公开日:2013-03-15
    发明作者:
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    The invention relates to a method for influencing the thread geometry of an internal thread of a first component of an injection device for internal combustion engines provided for guiding high-pressure medium, wherein the internal thread is formed on a tubular end portion of the first component, into which a second component can be screwed and against a bearing surface of the first Component is tensionable.
    The invention further relates to a threaded connection of high pressure medium leading components of an injection device for internal combustion engines, wherein a first component at a tubular end portion of an internal thread and a second component has a screwed into the internal thread external thread, wherein the second component when tightening the threaded connection with an end face against a Support surface of the first component is tensioned.
    Large storage volumes are necessary for common rail systems for large diesel engines for hydraulic reasons. This results - also for reasons of production - 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 have to 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 on the increase of the thread root radius - to reduce the notch effect - and by increasing the thread diameter - in which the «« * «* · · · · · t« · Μ • »# V · * · ♦ · * · · · · ·
    Power transmission area is increased - be achieved. Furthermore, through improved material quality, increased thread pitch, especially in highly annealed screw joints, heat treatment techniques, thread production (final tempered - finish rolled) and on the lubrication condition a positive influence on the load capacity of the screw can be achieved. 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 achieve this object, the invention provides in a method of the type mentioned above, that the tubular end portion is acted upon on the outside with a plastic deformation permitting radial compressive force, whereby the tubular end portion is deformed such that the internal thread towards the free end continuously decreasing inner diameter receives.
    To solve this problem, the invention further provides in a threaded connection of the type mentioned above, that the first component is processed by pressure deformation such that the internal thread is in
    Direction towards the free end continuously decreasing inside diameter.
    The invention thus relates to a preloaded preloaded and pre-formed thread geometry, which leads to a significant stress reduction and change in the stress distribution between the threads. The thread load is reduced by a targeted plastic deformation of the internal thread by pre-stamping with a high pressure force on the outside of the tubular end portion. As a result, on the one hand residual stresses in the thread root can be introduced and on the other hand there is a plastic deformation which leads to a thread pitch difference between the individual threads in the internal thread. These effects increase the load capacity of the thread and also change the force introduction in the thread. Both can have a very positive effect on the resilience of the thread.
    The thread pitch difference is achieved by the fact that the axial extent of the internal thread is reduced by the inward deformation with a constant number of threads. The internal thread thus receives a lower thread pitch than the external thread.
    The thread pitch difference leads to a homogenization of the force distribution in the internal thread. In conventional threaded connections, the distribution of the screw force on the individual internal threads is very uneven. The first load-bearing thread of the connection is subjected to the highest load. The homogenization of the force distribution relieves the critical, highly stressed point and, at the same time, loads the threads further away from the contact surface. This is achieved in that the internal thread has a smaller pitch than the external thread, whereby the screw force is first introduced into the side facing away from the support surface of the threads. As the biasing force increases, the threads closer to the bearing surface are increasingly involved in the transmission of force. This results in an overall more even load distribution of the paired threads.
    In order to facilitate the deformation of the tubular end portion, it is preferably provided that the first component at the transition to the tubular end portion on its outer side has a circumferentially extending material taper.
    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 holds together. 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. Via the inlet throttle 10, fuel pressure is again built up in the control chamber 11 and an additional closing force is generated 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 common 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.
    Fig. 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 a
    Internal thread 21 is provided. At the transition to the tubular end portion 20, the high pressure accumulator 6 has a circumferentially extending material taper 22, e.g. is formed as a circumferential groove. The holding body 5 is provided with an external thread 23 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 24 of the holding body 5 is clamped against the conical bearing surface 25 of the high-pressure accumulator 6, whereby a seal between the high pressure accumulator 6 and 5 holding body is achieved. In the tensioned state, the first thread 26 is subjected to the highest loads in conventional designs of the threaded connection.
    According to the invention, a radial pressing force 27 is now applied from the outside in the region of the internal thread 21, which leads to a plastic deformation of the tubular end portion 20. The result is a preloaded preloaded and pre-formed thread geometry. The radial pressing force 27 is applied, for example, by rolling. In particular, a linearly rising downward deformation of the thread is thereby observed, so that an inner diameter D of the internal thread 21, which in particular continuously decreases toward the free end, is generated. The thread pitch of the internal thread 21 is thereby reduced compared to the pitch of the external thread 23, so that when clamping the thread of the first supporting thread 26 is relieved.
    The deformation is shown in Fig. 2 10-fold increased.
    权利要求:
    Claims (5)
    [1]
    1. A method for influencing the thread geometry of an internal thread of a provided for guiding high-pressure medium first component of an injection device for internal combustion engines, wherein the internal thread is formed on a tubular end portion of the first component, in which a second component screwed and against a support surface of the first Component is clamped, characterized in that the tubular end portion is acted upon on the outside with a plastic deformation permitting radial compressive force, whereby the tubular end portion is deformed such that the internal thread (21) in a direction towards the free end continuously decreasing inner diameter (D) receives.
    [2]
    2. The method according to claim 1, characterized in that the first component (6) is an integrated high pressure accumulator of a modular common rail injector and the second component (5) is a holding body of the modular common rail injector.
    [3]
    3. 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 screwed into the internal thread external thread, the second component upon tightening of the threaded connection with an end face against a support surface of the first Can be clamped component, characterized in that the first component (6) is processed by pressure forming such that the internal thread (21) has a continuously decreasing towards the free end inside diameter (D).
    [4]
    4. threaded connection according to claim 3, characterized in that the first component (6} at the transition to the tubular end portion (20) on its outer side has a circumferentially extending material taper (22).
    [5]
    5. threaded connection according to claim 3 or 4, characterized in that the first component (6) is an integrated high pressure accumulator of a modular common rail injector and the second component (5) is a holding body of the modular common rail injector.

    February 2012

    Hafner and Keschmann Patentanwälte OG
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    DE102010001311A1|2010-01-28|2011-08-18|Robert Bosch GmbH, 70469|Method for high pressure-tight connection of at least one plate-shaped body with another body of a fuel injector and fuel injector|
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    AT513321A1|2012-08-16|2014-03-15|Bosch Gmbh Robert|Threaded connection for connecting components with high pressure medium|AT509877B1|2010-11-02|2011-12-15|Bosch Gmbh Robert|DEVICE FOR INJECTING FUEL IN THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE|
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