• 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 an injection nozzle for injecting media into a combustion chamber, in particular of fuel into the combustion chamber of an internal combustion engine, comprising a nozzle body (4), the nozzle tip (15) having the injection holes protruding into the combustion chamber (7), one in the combustion chamber end region of the nozzle body ( 4) arranged heat protection sleeve (2), which surrounds the nozzle body (4), wherein the injection nozzle (1) in a receiving bore (7) of a holding part, in particular cylinder head (3) is inserted, wherein the combustion chamber end portion of the nozzle body (4) with interposition the heat protection sleeve (2) cooperates with the receiving bore (7), the heat protection sleeve (2) has a first and a second region, which are axially spaced from one another, and each sealing surfaces (5,6,10,11), each sealing with a running in a radial plane, annular seat surface (8,9) or with a conical seat surface (12,13) of the Aufnahmeb (7) and the nozzle body (4) cooperate.
    公开号:AT512667A1
    申请号:T413/2012
    申请日:2012-04-05
    公开日:2013-10-15
    发明作者:
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    9 9 + · ** · «· '1
    The invention relates to an injection nozzle for injecting media into a combustion chamber, in particular of fuel into the combustion chamber of an internal combustion engine, comprising a nozzle body whose nozzle nozzle having the injection holes projects into the combustion chamber, a heat protection sleeve surrounding the nozzle body in the combustion chamber end region of the nozzle body. wherein the injection nozzle is inserted into a receiving bore of a holding part, in particular cylinder head, wherein the combustion chamber-side end region of the nozzle body interacts with the receiving bore with the interposition of the heat protection sleeve. Sleeves surrounding the nozzle body of fuel injectors, particularly gasoline direct injectors or diesel direct injectors, are already known. Their task is to surround the nozzle body as a cooling jacket. Furthermore, they also act as fastening means to fix the injection nozzle in the holding part, in particular in the cylinder head. For example, from DE 19743103 Al a heat protection sleeve is known which is inserted into a stepped receiving bore of a cylinder head of an internal combustion engine and encloses a discharge-side nozzle body of a fuel injection valve used in the receiving bore circumferentially. Heat-insulating sleeves are not only used in injection nozzles for internal combustion engines, but also in various injection systems in other areas, e.g. in the chemical industry, used. The thermal protection sleeve is usually made of copper or NiRo and covers the injection nozzle at the nozzle tip against heat input. * 2 I · «* *
    Further, it shrouds the injectors along the nozzle shaft to lower the temperature along the sleeves from the nozzle tip to a cooled region of the installation space, e.g. of the cylinder head, to transport. The thermal protection sleeve is occasionally made in one piece with the water sleeve, which separates the cooling channels formed in the cylinder head from Injektorbauraum.
    A disadvantage of the conventional constructions that they require a larger through hole in the holding part, since the through hole not only the nozzle body, but in addition also the nozzle body enclosing heat protection sleeve is to receive. From the larger through-hole in turn results in a larger force which is exerted on the basis of the combustion chamber pressure from the side of the combustion chamber to the injection nozzle, since said force increases quadratically with the diameter of the bore. In order to reduce the area exposed to the combustion chamber pressure, the injection nozzle can be formed at its tip with a chamfer, via which it rests on the holding part with the interposition of a sealing washer or the heat protection sleeve. However, this has the disadvantage that the clamping force with which the injection nozzle is clamped in the holding part is introduced on a relatively small diameter, which leads to disadvantageously high local stresses and deformations of the injection nozzle or the holding part.
    It is therefore the object of developing an injection nozzle of the type mentioned in that the Brennraudruck and the combustion chamber heat exposed surface of the nozzle body is minimized and the heat protection sleeve simultaneously ensures adequate sealing against the combustion chamber pressure. Furthermore, the clamping force with which the injection nozzle is clamped in the holding part, should not lead to local stresses, which leads to deformation of the injection nozzle or the holding part.
    To achieve this object, the invention provides that the thermal protection sleeve has a first and a second region, which are axially spaced from each other, wherein the second region is arranged closer to the nozzle tip than the first region, wherein in the first region on the outer shell, a first outer circumferential Sealing surface and the inner shell, a first inner circumferential sealing surface are formed and in the second region on the outer shell, a second outer circumferential sealing surface and the inner shell, a second inner circumferential sealing surface are formed, wherein the second sealing surfaces are smaller in diameter than the first sealing surfaces, wherein the first outer and the second outer sealing surface each sealingly cooperate with a running in a radial plane, annular seating surface or with a tapered seat surface of the receiving bore and the first inner and the second inner sealing surface each sealing with e iner in a radial plane extending, annular seat or with a conical seat of the nozzle body cooperate. The invention thus relates to designing a thermal protection sleeve in such a way that it preferably rests on the cylinder head both at the nozzle tip and at an upper sealing point on the cylinder head, wherein the thermal protection sleeve rests on the nozzle tip on a smaller diameter than on the upper one Sealing point, so that an installation of the side facing away from the combustion chamber is made possible. At the same time this results in a very small
    Surface of the nozzle, which is exposed to the combustion chamber heat and a seal against the combustion chamber pressure in a very small area, whereby the "blow by" inclination, i. the risk that combustion chamber pressure escapes between the injection nozzle and the cylinder head is considerably reduced. Another advantage is that when mounting on the nozzle tip, a surface pressure is produced, which is sufficient to seal against the combustion chamber pressure, wherein at the above-lying sealing point, the remaining clamping force of the injector voltage is added. The clamping force with which the injection nozzle is clamped in the cylinder head is thus at least partially introduced on a larger diameter, namely at the upper sealing point, so that the stresses and deflections arising in the nozzle body or in the cylinder head can be reduced.
    Preferably, the first sealing surfaces and the second sealing surfaces form a double fit, whereby a particularly effective fixing of the injection nozzle is achieved at two regions which are defined by the double fit.
    Since a deformation of the heat protection sleeve usually occurs when inserting the heat protection sleeve to compensate for component tolerances, the heat protection sleeve is according to a preferred development in the inserted state in the holding part of the injector under bias. This can be reduced by the fact that the heat protection sleeve is preferably made of a deformable material, so that the sealing surfaces are pressed when mounting on the seating surfaces, that the second sealing surfaces to form a surface pressure with the seating surfaces and that cooperates with the first
    Sealing surfaces and the corresponding seats the remaining clamping force of the nozzle voltage is added, whereby the heat protection sleeve with respect to the manufacturing costs and the corresponding costs can be made cheaper and the exact fit is achieved only when inserting by deformation of the selected material.
    If, as corresponds to a preferred embodiment of the present invention, at least one of the seats provided in the receiving bore is formed at a stage of the receiving bore, the receiving bore thus has a protruding from the axial direction of the bore shoulder, the axial component of the combustion chamber pressure of the Injector kept away and the "blow by" inclination is further reduced.
    Preferably, at least one of the seat surfaces provided on the nozzle body is formed on the nozzle retaining nut.
    According to a further preferred embodiment of the present invention, the second sealing surfaces are formed at the combustion chamber end of the heat protection sleeve, so that the area exposed to the combustion chamber is further minimized. In this case, the cooperation of the second sealing surfaces with the seating surfaces preferably produces the combustion chamber-side sealing of the nozzle body in the receiving bore.
    In order to ensure the surface pressure on the first and second sealing surfaces for realizing said double fit, the invention is preferably further developed such that the heat protection sleeve arranged in an axial portion between the first sealing surfaces and the second sealing surfaces at a radial distance from the nozzle body and the wall of the receiving bore is.
    In order to dissipate the heat prevailing in the combustion chamber as efficiently as possible from the nozzle tip, the invention is preferably further developed such that the heat protection sleeve consists of a material with high thermal conductivity, in particular a thermal conductivity of greater than 100 W / {mK), in particular of copper or a copper alloy ,
    In some cases, additional cooling takes place in the cylinder head, in which cooling water in the region of the nozzle body in the cylinder head is guided in a channel, this channel being limited in the prior art by a water sleeve. According to a preferred embodiment of the present invention, it is therefore provided that the heat protection sleeve is integrally formed with a water sleeve, which surrounds the nozzle body and limits a holding part arranged in the cooling channel with respect to the nozzle body.
    A particularly good sealing effect is achieved if, as corresponds to a preferred embodiment of the present invention, the second sealing surfaces have at least one protruding, circumferential edge, in particular Beißkanten.
    A further improvement of the sealing effect under the influence of the combustion chamber pressure is achieved if, according to a preferred embodiment, the present •. ·;
    Invention, the heat protection sleeve between the inner and the outer second sealing surface has an open towards the combustion chamber side end, extending in the circumferential direction groove or a slot.
    The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. 1 is a sectional view of a water-cooled cylinder head with inserted injection nozzle and heat protection sleeve, FIG. 2 is an exploded view of the embodiment of FIG. 1,
    3 shows an embodiment in which the heat protection sleeve is at the same time the water sleeve, FIG. 4 shows a preferred embodiment of the heat protection sleeve with biting edges and FIG. 5 shows a slotted embodiment of the heat protection sleeve.
    In Fig. 1, the injection nozzle according to the invention 1, wherein a heat protection sleeve 2 between the cylinder head 3 and the nozzle body 4 is arranged. As is apparent from the detailed illustration according to FIG. 2, the heat protection sleeve 2 has a first outer sealing surface 5 and a first inner sealing surface 6 in a first sealing region. In the state inserted into the receiving bore 7 of the cylinder head 3, the first outer sealing surface 5 sealingly cooperates with an annular seating surface 8 of the receiving bore 7 extending in a radial plane. The first inner sealing surface 6 sealingly cooperates with an annular seat surface 9 of the nozzle retaining nut 14 which extends in a radial plane. The heat protection sleeve 2 further has a second outer sealing surface 10 and a second inner sealing surface 11 in a second sealing region.
    In the state inserted into the receiving bore 7 of the cylinder head 3, the second outer sealing surface 10 sealingly cooperates with a conical seat surface 12 of the receiving bore 7. The second inner sealing surface 11 sealingly cooperates with a conical seat surface 13 of the nozzle body 4 or the nozzle tip 15.
    The first and second sealing surfaces, together with the corresponding seating surfaces of the receiving bore 7 and of the nozzle body 4, form a double fit. In the case of double fits, there is generally the problem that, depending on manufacturing tolerances, more or less pronounced stresses arise in the affected component, which can change with the slightest environmental change (for example thermal expansion), resulting in random and therefore unpredictable states. Due to these indeterminabilities in double fits, the extent of surface pressure is also, for example, in the second sealing area, i. at the nozzle tip, unmanageable, from which the risk of leakage arises.
    In order to avoid the problems described above caused by the double-fitting, the heat-insulating sleeve is preferably made of a soft metal, in particular a metal having a Mohs hardness of < 4, such as Copper or its alloys, so that deforms the heat protection sleeve when inserting the injection nozzle and thereby the component tolerances are compensated and a surface pressure is achieved especially in the second sealing area. The Injektorklemmkraft is hereby partly taken in the second sealing area and partly in the first sealing area. The combustion chamber pressure, which is symbolized by the arrow 16 is determined by the
    Injektorklemmkraft, symbolized by the arrow 17, more than balanced and the nozzle body 4 thus held in the cylinder head 3. Due to the inventive design of the heat protection sleeve 2, the largest area of the nozzle tip 15 of the nozzle body 4 is protected from the heat of the combustion chamber 17. 18, the injection jet of the injection nozzle 1 is shown schematically. A water sleeve 19 separates a water-filled cooling channel 20, which is arranged in the cylinder head 3, from the nozzle body 4.
    3, the heat protection sleeve 2 and the water protection sleeve are integrally formed, whereby the water in the cooling channel 20 and the heat protection sleeve 2 cools, whereby an improved dissipation of heat from the nozzle tip is achieved.
    In Fig. 4 it can be seen that the heat protection sleeve 2, which is arranged between the cylinder head 3 and the injection nozzle 1, in its second sealing region with a peripheral edge which acts as a biting edge 21 on the two parts 3 and 4 is formed. This design leads to an increased sealing effect. Furthermore, it can be seen that the heat protection sleeve 2 is formed in its cylindrical portion 22, which lies between the first sealing surfaces and the second sealing surfaces, at a radial distance from the nozzle body 4 and the wall of the receiving bore 7 in the cylinder head 3.
    In Fig. 5 it is now shown that the end portion 23 of the heat protection sleeve 2 is designed with a slot 24.
    If now the heat protection sleeve 2 is subjected to combustion chamber pressure, this leads to an expansion of the
    Biting edge 21 on the nozzle body 4 and the cylinder head 3, whereby an increased sealing effect is achieved.
    权利要求:
    Claims (13)
    [1]
    1. Injection nozzle for injecting media into a combustion chamber, in particular of fuel into the combustion chamber of an internal combustion engine, comprising a nozzle body whose nozzle holes having the injection holes project into the combustion chamber, a heat protection sleeve which surrounds the nozzle body in the combustion chamber end region of the nozzle body, wherein the injection nozzle is inserted into a receiving bore of a holding part, in particular cylinder head, wherein the combustion chamber end portion of the nozzle body with the interposition of the heat protection sleeve cooperates with the receiving bore, characterized in that the heat protection sleeve (2) has a first and a second region axially from each other are spaced apart, wherein the second region is arranged closer to the nozzle tip (15) than the first region, wherein in the first region on the outer jacket, a first outer circumferential sealing surface (5) and the inner jacket, a first inn ere outer sealing surface (6) are formed and formed in the second region on the outer jacket a second outer circumferential sealing surface (10) and the inner shell, a second inner circumferential sealing surface (11), wherein the second sealing surfaces (10,11) are smaller in diameter the first sealing surfaces (5, 6), wherein the first outer (5) and the second outer sealing surfaces (10) each sealingly with an annular seat surface (8) extending in a radial plane or with a tapered seat surface (12) of the receiving bore (10). 7) cooperation and the first inner (6) and the second inner sealing surface (11) each sealingly cooperate with a running in a radial plane, annular seat surface (9) or with a conical seat surface (13) of the nozzle body (4).
    [2]
    2. Injection nozzle according to claim 1, characterized in that the first sealing surfaces (5,6) and the second sealing surfaces (12,13) form a double fit.
    [3]
    3. Injection nozzle according to claim 1 or 2, characterized in that the heat protection sleeve (2) in the in the holding part (3) inserted state of the injection nozzle (1) is under bias.
    [4]
    4. Injection nozzle according to claim 1, 2 or 3, characterized in that the heat protection sleeve (2) consists of a deformable material, in particular copper and its alloys, so that the sealing surfaces (5,6,10,11) when mounting so on the Sitting surfaces (8,9,12,13) are pressed, that the second sealing surfaces (10,11) to form a surface pressure with the seating surfaces (12,13) Cooperation and that on the first sealing surfaces (5,6) and the corresponding seats (8.9) the remaining clamping force of the nozzle voltage is recorded.
    [5]
    5. Injection nozzle according to one of claims 1 to 4, characterized in that at least one of the receiving bore (7) provided seating surfaces (8,12) is formed at a stage of the receiving bore (7).
    [6]
    6. Injection nozzle according to one of claims 1 to 5, characterized in that at least one of the nozzle body (4) provided seating surfaces (9,13) on the nozzle retaining nut (14) is formed.
    [7]
    7. Injection nozzle according to one of claims 1 b.is 6, characterized in that the second sealing surfaces (10,11) are formed at the combustion chamber end of the heat protection sleeve (2).
    [8]
    8. Injection nozzle according to one of claims 1 to 7, characterized in that the interaction of the second sealing surfaces (10,11) with the seat surfaces (12,13) produces the combustion chamber-side sealing of the nozzle body (4) in the receiving bore (7).
    [9]
    9. Injection nozzle according to one of claims 1 to 8, characterized in that the heat protection sleeve (2) in an axial section between the first sealing surfaces (5,6) and the second sealing surfaces (10,11) at a radial distance from the nozzle body (4 ) and the wall of the receiving bore (7) is arranged.
    [10]
    10. Injection nozzle according to one of claims 1 to 9, characterized in that the heat protection sleeve (2) made of a material having high thermal conductivity, in particular a thermal conductivity of greater than 100 W / (m-K), in particular of copper or a copper alloy.
    [11]
    11. Injection nozzle according to one of claims 1 to 10, characterized in that the heat protection sleeve (2) is integrally formed with a water sleeve (19) surrounding the nozzle body (4) and a in the holding part (3) arranged cooling channel (20) opposite limited to the nozzle body (4).
    [12]
    12. Injection nozzle according to one of claims 1 to 11, characterized in that the second sealing surfaces (10,11) have at least one projecting, circumferential edge, in particular Beißkanten (21).
    [13]
    13. Injection nozzle according to one of claims 1 to 12, characterized in that the heat protection sleeve (2) between the inner and the outer second sealing surface (10,11) has an open towards the combustion chamber end open, circumferentially extending groove or slot (24) having. Vienna, on April 5, 2012 applicant by

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    同族专利:
    公开号 | 公开日
    AT512667B1|2014-03-15|
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    WO2013149954A1|2013-10-10|
    US20150034051A1|2015-02-05|
    EP2834511B1|2019-05-08|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE7827497U1|1978-09-15|1980-03-06|Robert Bosch Gmbh, 7000 Stuttgart|HEAT PROTECTION FOR NOZZLES OF INTERNAL COMBUSTION ENGINES|
    JPS5758770U|1980-09-25|1982-04-07|
    JPH1121679A|1997-07-03|1999-01-26|Sumitomo Electric Ind Ltd|Machine structural parts covered with ceramic heat insulation material|
    DE19743103A1|1997-09-30|1999-04-01|Bosch Gmbh Robert|Heat protection sleeve|DE102013021261A1|2013-12-14|2015-06-18|Daimler Ag|Fuel injection nozzle for an internal combustion engine|
    DE102019124234A1|2019-09-10|2021-03-11|Man Energy Solutions Se|Internal combustion engine|FR848063A|1938-01-11|1939-10-23|Saurer Ag Adolph|Nozzle device for fuel injection engines|
    DE974647C|1952-06-14|1961-03-16|Maschf Augsburg Nuernberg Ag|The nozzle holder for injection internal combustion engines is surrounded by the coolant and designed as a thin-walled jacket|
    US2887994A|1957-05-23|1959-05-26|Lister & Co Ltd R A|Fuel injector of air-cooled compression ignition engine|
    US5494220A|1994-08-08|1996-02-27|Caterpillar Inc.|Fuel injector assembly with pressure-equalized valve seat|
    JPH10252610A|1997-01-13|1998-09-22|Yamaha Motor Co Ltd|Cylinder injection cylinder|
    DE19838755B4|1998-08-26|2006-11-09|Daimlerchrysler Ag|On the combustion chamber of an internal combustion engine injecting fuel injection nozzle|AT517054B1|2015-04-14|2017-02-15|Ge Jenbacher Gmbh & Co Og|Arrangement of a cylinder head and a fuel injector|
    DE102015223605A1|2015-11-27|2017-06-01|Robert Bosch Gmbh|Injector arrangement with thermal protection sleeve|
    CA2950198A1|2015-12-02|2017-06-02|Aaron Di Pietro|Fuel injector insert|
    DE102015225055A1|2015-12-14|2017-06-14|Robert Bosch Gmbh|fuel injector|
    DE102016206796A1|2016-04-21|2017-10-26|Robert Bosch Gmbh|fuel injector|
    DE102018217768A1|2018-10-17|2020-04-23|Robert Bosch Gmbh|Injector arrangement|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA413/2012A|AT512667B1|2012-04-05|2012-04-05|Injection nozzle for injecting media into a combustion chamber|ATA413/2012A| AT512667B1|2012-04-05|2012-04-05|Injection nozzle for injecting media into a combustion chamber|
    US14/386,849| US9382888B2|2012-04-05|2013-03-28|Injection nozzle for injecting media into a combustion chamber|
    PCT/EP2013/056770| WO2013149954A1|2012-04-05|2013-03-28|Injection nozzle for injecting media into a combustion chamber|
    EP13715648.5A| EP2834511B1|2012-04-05|2013-03-28|Injection nozzle for injecting media into a combustion chamber|
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