• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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  • 优先权
    • 专利摘要:
    A gearbox injection unit (10), which comprises an injector (12) having an inlet (30) and an outlet (32), an actuator unit, comprising a pole piece (46), a frame (16), a coil and a spring (50), a valve assembly, the armature (16) comprises an armature pocket and the pole piece (46) comprises a pole piece pocket.
    公开号:FR3071012A1
    申请号:FR1871043
    申请日:2018-09-14
    公开日:2019-03-15
    发明作者:Douglas Edward Cosby；Stephen C. Bugos
    申请人:Continental Automotive Systems Inc；
    IPC主号:
    专利说明:

    PB FLUID REDUCTION INJECTOR
    Technical Field [0001] The present invention relates, in general, to a fluid injector of a reducer injection unit (UIR) and, in particular, to a robust fluid injector of the UIR for non-purge applications.
    Prior art [0002] Emission regulations in Europe and in
    North America is driving the implementation of new exhaust aftertreatment systems, especially for lean combustion technologies, such as compression ignition (diesel) engines and spark ignition spark ignition engines (usually direct injection), which operate in poor and ultra-poor conditions. Lean combustion engines have. nitrogen oxide (NOx) emission levels, which are difficult to deal with in oxygen-rich exhaust environments characteristic of lean combustion. Exhaust post-treatment technologies are commonly developed in order to treat NOx under these conditions.
    One of these technologies includes a catalyst, which on nitrogen (N 2 ) and water (H 2 0) technology called reduction (RCS).
    difficult to handle in its pure form in an automobile, this is why it is with these diesel luide systems (FED) and / or a urea solution, concentration at o O 0.
    AdBlue. The reducing solution is sent to d 1 exhaust.
    normally because 1 is in ammonia before entering the
    More specifically, the solution is sent to a hot exhaust stream and is transformed into ammonia in the exhaust, after having undergone thermolysis, or thermal decomposition, into ammonia and isocyanic acid (HNCO). The acid then undergoes hydrolysis by the water present in the exhaust, and transformed into ammonia and ammonia coming from thermolysis and from hydrolysis then undergoing a reaction [0004] AUS-32, or AdBlue, has a freezing point of
    -11 ° C and you can expect the system to freeze in cold climates. As these fluids are aqueous, an increase in volume occurs after the transition to the solid state during freezing. The expanding solid can apply significant forces to any enclosed volume, such as an injector. This expansion can damage the injection unit and that is why there are different RCS strategies to cope with the expansion of the reducer.
    There are two known strategies for an RCS system on the market: purge systems and systems without purge. In purge RCS systems, the reducing urea and / or an FED solution is purged from the UIR when the vehicle engine is stopped. In RCS systems without bleeding, the gear unit remains in the UIR for the life of the vehicle. During normal operation of an SCR system with purging, the injector of the UIR operates at temperatures, which are above the freezing point of the reducer, so that the reducer in the UIR remains at the liquid state. However, when the vehicle engine is stopped in the RCS system without bleeding, the UIR injector remains filled with reducer, making the UIR injector susceptible to damage by expansion of the reducer in freezing conditions.
    SUMMARY OF THE INVENTION Embodiments given by way of example overcome the drawbacks of the fluid injectors of the existing UIR and provide an improved fluid injector for RCS systems without bleeding in which the harmful effects of the UIR, being at temperatures which are lower than the freezing point of the reducer are decreased. According to an exemplary embodiment, a UIR comprises a fluid injector having a fluid inlet, disposed at a first end of the fluid injector for receiving a reducing agent, and a fluid outlet disposed at a second end of the fluid injector for discharging the reducer, the fluid injector defining a fluid path for the reducer going from the fluid inlet to the fluid outlet; an actuator unit, comprising a pole piece, disposed in a fixed position in the fluid injector, a movable frame, a coil, arranged near the pole piece and the movable frame, and a spring, an assembly valve comprising a valve seat disposed at or near the second end of the fluid injector and a seal member connected to the frame and operable with the valve seat;
    in which. the armature comprises an armature pocket, the armature pocket defining, at least in part, the fluid path of the fluid injector in the armature and the pole piece comprises a pole piece pocket defined in one end downstream of the pole piece and which defines, at least in part, the fluid path in the pole piece, the armature pocket receiving a first end of the spring and the pole piece pocket receiving a second end of the spring, the pocket of the frame and the pocket of the pole piece each comprising an end wall with which the first and. second ends of the spring respectively come into contact.
    In an exemplary embodiment, the pole piece comprises a bore defined in the pole piece, the bore of the pole piece comprising the pocket of the pole piece and defining the fluid path in the pole piece. The pole pocket has a diameter, which is larger than a diameter of the bore of the pole piece at locations along the pole piece other than along the pocket of the pole piece. The diameter of the pocket of the pole piece is at least twice as large as the diameter of the bore of the pole piece at locations along the pole piece other than along the pocket of the pole piece. The bore of the pole piece only defines the fluid path in or around the pole piece.
    In an exemplary embodiment, the fluid injector further comprises a volume reduction element, disposed upstream of the pole piece, in which, one end upstream of the pole piece is close to i
    The reduction element volume reduction can be defined. The bore of one end downstream of volume. The element of comprising a bore which the volume reduction element and the bore of the pole piece part of the fluid path of the injector making
    volume
    The bore of the reducing member forms the only part of the fluid path in or around the volume reducing member. A diameter of the bore of the volume reduction member is the same as a diameter of the bore of the pole piece along locations of the pole piece other than. along the pocket of the pole piece.
    0009] The piece polar can to be welded in 1'injecteur of fluid, so to be fixed there. The spring provides a strength from spring to
    the armature, which rests, at least in part, on a location of the pole piece in the injector, a depth of the pocket of the armature and a depth of the pocket of
    pole piece.
    In one embodiment given by way of example, the bore of the pole piece receives only the second end of the spring and of the reducer.
    In an exemplary embodiment, the fluid injector is arranged in the reducer injection unit and forms a part thereof.
    D®scx‘iptic> n succinct® of the drawings [0011] Facets of the invention will be explained in. detail below, referring to an embodiment given by way of example, in conjunction with the drawings in which:
    Figure 1 is a side sectional view of a UIR for an RCS system without bleeding according to an embodiment given as an example;
    Figure 2 is a side view in section of a fluid injector of the
    UIR of figure 8 1;
    Figure 3 is an enlarged sectional view of the inlet part of the fluid injector of the UIR of Figure 1 according to an embodiment given by way of example;
    Figure 4 is an exploded perspective view of elements of the fluid injector of the UIR of Figure 1 according to an embodiment given by way of example;
    Figure 5 is an enlarged sectional view of the outlet portion of the fluid injector of the UIR of Figure 1 according to an embodiment given by way of example;
    Is a sectional view on a larger scale of the inlet portion of the fluid injector injector of the UIR of Figure 1 according to an embodiment given by way of example;
    Figure 7 is an exploded perspective view of elements of the fluid injector of Figure 6;
    Figure 8 is a view sectional of the 10items from the j Figure 6;
    Description of the embodiments
    the description that goes follow fashions of production given to be d ! example East simply illustrative by nature and n ' East intended in no way to limit the inventi .we,
    its application or uses.
    The embodiments given by way of example are aimed, in general, at a UIR 20 for an RCS system without purging, in which the damaging effects of a reducing agent, an FDE and / or urea solution freezing in the UIR injector are decreased.
    FIG. 1 illustrates a UIR 10 of a 25 RCS system without purging according to an embodiment given by way of example. The UIR 10 includes an electromagnet fluid injector, indicated generally by 12, which provides a fluid metering function and provides the preparation for spraying the fluid into the exhaust path of a vehicle in an application of dosage. The fluid injector 12 is thus constructed and arranged to be associated with an exhaust gas flow path upstream of a catalytic converter (not shown) by selective catalytic reduction (RCS). The fluid injector 12 may be an electrically operated electromagnet fuel injector. As shown in Figures 1 and 2, the fluid injector 12 includes an actuator unit having a coil 14 and a movable frame 16. Elements of a from for a reducer, a
    FDE
    The FDE and / or the that the UIR is for injecting into the traj and exhaust of an ae engine, will be designated hereinafter by reducer "for the sake of simplicity.
    [0023]
    The fluid injector 12 is disposed in a support 18 inside the UIR 10, as shown in FIG. 1. An injector protection, indicated generally by 20, is formed by an upper protection 20A and of a lower protection 20B, which surround the injector 12 and are connected to the support 18 by folding tabs of a flange 22 of the lower protection 20B on the particularities of folding the support 18 and the upper protection 20A. It follows that the protection 20 and the support 18 are fixed relative to the injector 12.
    An inlet cup structure of the UIR
    10, generally indicated by 24 in FIG. 1, comprises a cup 26 and a fluid supply tube 28 formed in one piece with the cup 26. The fluid supply tube 28 communicates with a source of a reducer (not shown), which is sent into a fluid inlet 30 of the injector 12 for ejection from its fluid outlet 12 and into the exhaust stream of a vehicle engine (not shown ). The fluid inlet 30 of the injector 12 is in fluid communication with the fluid supply tube 28. The fluid outlet 32 communicates fluidly with an outlet 34 of an exhaust flange 36, which is directly coupled with one end of the lower protection 20B of the UIR 10.
    The injector 12 includes an injector body structure, in which the elements of the injector 12 are arranged. The injector body structure comprises a first part 38 of injector body, in which are arranged a coil 14 and a frame 16, and a part 40 of valve body, in which is disposed, at least in part, a injector valve assembly 12. The first part 38 of the injector body and the part 40 of the valve body are fixedly connected, directly or indirectly, to each other.
    Referring to Figures 1 to 3, a fluid injector 12 comprises a tube element 42, which is arranged, at least in part, in the first part 38 of the injector body. The outer surface of the tube member 42 is in contact with the inner surface of the first part of the injector body. An open end of the element 42 is disposed in the cup 26 is in fluid communication with the feed tube is disposed in between the surface and the of the tube element, the tube element 42. The .J
    C1 leaving the fluid supply tube 28, passes into the open end of the tube element 42 of the injector 12.
    The actuator unit of the fluid injector 12 further comprises a pole piece 46 which is fixedly disposed in the first part 38 of the body of the injector. The coil 14 surrounds, at least in part, the pole piece 46 and the frame 16. The pole piece 46 is disposed upstream of the frame 16 in the injector 12. The pole piece 46 includes a central bore defined axially in this one.
    The frame 16 comprises a U-shaped part, which defines a pocket, in which is arranged at least part of a spring 50. The spring 50, which is part of the actuator unit, repels the movable armature 16, so that the armature 16 is placed at a distance from the pole piece 46 when it does not pass current through the coil 14. The spring 50 extends partially in the central bore of the piece 46 polar. One end of the spring 50, which extends in the pole piece 46, is in contact with a tube 52 for adjusting the spring. Tube 52 of
    setting of spring is disposed, at least in part, in the central bore of the room 46 polar, in upstream (by report in the sense όθ 1'écoulement of the reducer in 1inj ector 12) of spring 50. The tube 52 adjustment * spring e
    includes a bore axially defined therein. The through bore of the spring adjustment tube 52 partially defines the fluid path for the reducer in the fluid injector 12 and defines the only fluid path for the reducer in the pole piece 46. Due to its cooperation with the spring 50, the spring adjustment tube 52 is used to calibrate
    Dynamic flow of reducer in the fluid injector 12.
    [0029]
    The frame 16 further comprises one or more channels 60 (Figures 1 and 2) defined in the frame 16 and going from an interior of the
    pocket to a part end upstream of a element 58 of spindle. The canals 60 can to be distributed also at tower of 1 ! frame 16. In
    an embodiment given by way of example, the frame 16 comprises a single channel, which is defined entirely around the base of the pocket formed by the wall 16A of the pocket. The channel or channels 60 allows the reducer to pass from the pocket of the frame 16 to the space around the upstream end of the pin element 58.
    The frame door 16 and the channel (s) 60
    define in party together the path of injector 12 reducer fluid defined .of and define the only part of path of flowing fluid in frame 16 or around Ο.Θ it.
    Referring to Figures 1, 2 and 5, the assembly of the injector 12 comprises a seal element 54 and a seat 56. The seal element 54 is connected to a frame 16 by the element 58 spindle, which is mounted between the seal element 54 and the downstream end of the frame 16.
    The seal element 54, the pin element 58 and the frame 16 can be combined to form a frame assembly. When the coil 14 is energized, the coil 14 produces an electromagnetic force acting on: the armature 16, which overcomes the force of the spring 50 and cause the armature 16 to move towards the pole piece 46, which, d 'Correspondingly, moves the element 58 of spindle, so as to lift the element. 54 seat seal 5 6 and to stop cooperation, moving the frame assembly to an open position and allowing passing through the outlet 32 34 flange and into the vehicle engine. When it is no longer under electromagnetic action, it acts on the armature, the armature 16 moves away from the reduction gear, to pass in fluid towards the exit of the exhaust path of the coil 14 is tension, the force dissipates and the spring 50
    16, so that the pole piece, which results in the fact that the element 54 of j anointed, cooperating sealingly with the seat
    56, returns the armature assembly to a closed position. The armature assembly being in the closed position, the reducer is prevented from passing through the seat 56 and into the flange outlet 34 and from going into the exhaust path of the vehicle engine.
    [0031]
    As mentioned above, the UIR 10 forms part of an exhaust aftertreatment system of a RCS without purge. It follows that the reducer remains in the fluid injector 12 after the vehicle engine has been stopped. In certain embodiments given by way of example, the fluid injector 12 is configured so as to reduce the quantity of reducing agent in the fluid injector 12. In other words, the total volume of the fluid path for the reducer in the fluid injector 12 is reduced. By having less space for reducer in the injector 12, the amount of reducer in the UIR 10, which can potentially freeze, is reduced, making the injector 12 less likely to be damaged by extension forces from the frozen reducer.
    In order to reduce the volume of the reducing fluid path in the fluid injector 12, the thickness of the part 40 of the valve body is increased. In. furthermore, the spindle element 58 is constructed as a solid element, so that reducer passes around the external surface of the spindle element 58 instead of passing through it. The distance between the outer surface of the pin 58 and the inner surface of the part 40 of the valve body, which partly defines the fluid path for the reducing agent in the injector 12, is reduced. This reduced portion of the fluid path is the only fluid path for the reducer between the frame 16 and the seat 56 in the fluid injector 12. The reduced fluid path between pin 58 and the portion 40 of the valve body provides sufficient reducer flow through the fluid injector 12 to inject reducer during normal operation of the UIR 10, while by maintaining a relatively small volume of reducer in the injector 12, so as to reduce the danger that the injector 12 is damaged by the fact that the reducer freezes there.
    In addition, the diameter of the pocket of the frame
    16, in which the spring 50 is arranged at least in part, is reduced, which makes it possible to increase the thickness of the pocket wall 16A of the frame 16. In an embodiment given by way of example, the thickness of the pocket wall 16A represents between 45% and 75% of the diameter of the. pocket, such as around 60%.
    The increase in the thickness of the wall 16A of the pocket as well as the increased thickness of the part 40 of the valve body and the fact that the pin element 50 is a solid pin means that the elements of the injector 12 are reinforced and thus more resistant to freezing forces of the reducer.
    In addition, the bore of the spring adjustment tube 52 is dimensioned to reduce the volume of the fluid path of the reducer in the injector 12. In an embodiment given by way of example, the diameter of the bore of the spring adjustment tube 52 represents between 12% and 22% of the external diameter of the pole piece 46 and, in particular, between 16% and 19% thereof.
    Figure 3 illustrates a part upstream of the injector 12. The element. 42 of tube extends at least partially in the injector. The fluid path of the reducer in the injector 12 passes through the tube element 42. The injector 12 comprises a filter 204 disposed in the tube element 42 near the open end thereof. Filter 204 is a structurally rigid, sintered metal filter, such as a stainless steel material, to better resist expansion forces from freezing of the reducer. The filter 204 may have an exterior support structure for adding resistance. As best seen in Figure 3, the filter 204 is disposed in a cap member 206. The cap element 206 is of largely cylindrical shape, having a lateral wall 206A extending circumferentially and defining an interior volume dimensioned to receive the filter 204. The cap element 206 is dimensioned to fit in the element. 42 of the tube and, in particular, so that the outer surface of the side wall 206A of the cap element 206 is in contact with the inner surface of the tube element 42. The cap element 206 further comprises annular 206B elements disposed along the axial ends of the cap element 206 and extending radially inward from the side wall 206A. The annular elements 206B serve to hold the filter 204 in the cap element 206 in a fixed position. The cap element 206 is made of metal or similar compositions.
    The injector 12 further comprises a ring
    207 retaining element, which is arranged in the tube element 42, upstream of the cap element 20 6 and in contact therewith, as shown in FIGS. 1 to 3. The retaining element 207 is fixed to tube element 42, along a surface
    indoor of this one. The ring 207 of reten eu being fixed in position along 1 'é'. Element 42tube, serves at maintain elements in downstream of .1 injector 1 2 in positions fixed in 1.
    first part 38 of the injector body. In an exemplary embodiment, the retaining ring 207 is welded along the interior surface of the tube member 42. This bond by welding is. formed along an entire circumference of the upper edge of the retaining ring 207. However, it goes without saying that other connecting mechanisms can be used to fix the retaining ring 207 to the tube element 42.
    Referring to Figures 1 to 4, the injector further comprises a volume reduction member 088 which serves to further reduce the volume of the reducing fluid path in the injector 12. The reduction element 208 and mainly cylindrical in shape, as shown in FIG. 4, having a top end (upstream) and a bottom end (downstream). In one embodiment, the volume reduction member 208 is made of a metal, such as stainless steel. It goes without saying, however, that the volume reduction element 208 can be made of other metals or other metallic compositions. The outer surface of the volume reduction member 208 is sized to come into contact with the inner surface of the tube member 42.
    The volume reduction element 208 further comprises a bore 208A (FIGS. 2 and 3) defined in the axial direction in the volume reduction element 208, going from an axial end (apex) to the other axial end (bottom). The bore 208A is placed along the longitudinal axis of the volume reduction element 208 and itself forms part of the fluid path for passing the reducer into the injector 12. The bore. 208A forms the only fluid path for passing reducer into or around the volume reduction element 208. In an embodiment given by way of example, the diameter of the bore 208A represents from 12% to 20% of the external diameter of the volume reduction element 208, such as about 16%. As the volume reduction element 208 extends radially towards the interior surface of the tube element 42 and as the diameter of the bore 208A is small compared to the outside diameter of the volume reduction element 208, the volume reduction element 208 reduces the space or volume in which the reducing agent can reside in the injector 12 thereby reducing the volume of the reducing fluid path therein. The volume reduction element 208 further facilitates holding the spring adjustment tube 52 in position in the injector 12, so that the spring adjustment tube 52 maintains a desired force on the spring 50, so prevent loss of calibration. More specifically, the retaining ring 207 maintains the position of the filter 204 and of the corresponding cap element 206, which maintains. the position of the volume reduction element 208, which maintains the position of the spring adjustment element 52.
    Referring to Figures 1 to 4, the fluid injector further comprises a volume compensation element 210, which is disposed between the bottom end (upstream) of the reduction element 208 volume and the top of the pole piece. The volume compensation element 210 is made of an elastic material and serves to occupy the space between the volume reduction element 208 and the pole piece 46, so as to further reduce the volume of the fluid path of the reducer in the injector 12. The volume compensation element 210 may be in the state
    compressed in injector 12when East assembled and be in contact with Ί 1 item 208 of wholesale discount volume n, the piece 4 6 polar, the area interior of the element 42 of tube and the area element exterior 52 adjustment of
    spring.
    Figure 5 illustrates part of the downstream end of the fluid injector 12. As can be seen, the seat 56 comprises a bore defined axially in the seat 56. In one embodiment by way of example, the length of the bore passing through the seat 56 is reduced, so as to further decrease the volume of the fluid path of the reducer in the seat 56 and, in particular, the bag volume below the sealing strip of the seat 56, which cooperates with the sealing element 54.
    According to an embodiment given by way of example, the fluid injector 12 comprises a plurality of discs 212 with orifice arranged in a stack. The orifice disc stack is disposed on the downstream end of the seat 56. In the exemplary embodiment, which is illustrated in FIG. 5, the disc stack comprises a first disc 212A having an orifice or more orifices, which are configured to provide the desired spray configuration of a reducer outlet injector 12. It goes without saying that the size and the locations of the orifices of the first disc 212A can vary and depend on the reducer dosage requirements of the passenger vehicle engine. The stack of discs further comprises a second disc 212B, which is arranged downstream of the first disc 212A and which passes through a reduction gear. The second is placed on the
    212A, so as to prevent disc
    212A, thinner, deforms under frozen forces upstream of the first disc [0042] As mentioned above, the fluid injector 12, and in particular its elements, are configured to reduce the volume of the fluid path of the reducer in The injector 12. In the exemplary embodiments, the ratio of the volume of the fluid path in the fluid injector 12 to a volume of the injector elements 12 (including but not necessarily limited to the coil 14, armature 16, pole piece 46, spring adjustment tube 52, volume reduction element 208, volume compensation element 210, filter 204, retaining ring 207, the spring 50, the element 58 of the spindle, the element 54 of the seal, the seat 56, the first part 20Ά of the body of the injector and the part 40 of the body of the valve) is between 0.08 and 0 , 30, and in particular between 0.12 and 0.20, such as around 0.15. These volume quantities are calculated between planes orthogonal to the longitudinal axis of the fluid injector 12 - from a first plane following the end of the tube element
    The entry of a second plane the surface of the disk 212B of fluid). It goes without saying that the particular volume ratio of the reducer to the volume of
    The inj ector
    1 fluid injector can vary according to number at cost and take it any value between approximately 0.08, 30. Providing a fluid injector with a reduced ratio of the volume of the reducer path to the volume advantageously results in less reducer in the injector 12, which makes the UIR 10 less likely to be damaged if the reducer in the injector 12 freezes.
    Figure 6 illustrates a fluid injector 12 according to another embodiment given by way of example. The elements of the fluid injector 12 in FIG. 6 include a number of the elements of the injector described above with reference to FIGS. 1 to 5, including the tube element 42, the filter 204, the element 206 cap, retaining ring 207, volume reduction element 208, coil 14, frame 16, spring 50, valve body part 40, pin element 58, element 54 of the seal and the seat 56. Elements of this kind are also represented in FIG. 7. Unlike the injector 12 of fluid of FIG. 2, the injector 12 of fluid of FIG. 6 does not include tube 52 for adjusting the spring, nor for element 210 for volume compensation. The fluid injector 12 of FIG. 6 also includes the pole piece 66, which is disposed between the volume reduction element 208 and the frame 16. The pole piece 66 includes a bore 66A, which is defined longitudinally. A downstream end of the pole piece 66 is widened to form a pocket 66B, which is dimensioned to receive part of the spring 50. As shown more clearly in FIG. 8, the pocket 66B is defined by a side wall 66C and by a 66D end wall. Each end wall 66D defines a rim against which comes the upstream end of the spring 50. In the embodiment given by way of example, the two ends of the spring 50 come into contact with the end walls of the pocket 16A of the frame 16 and pocket 66B of the pole piece 66.
    In one example, the approximately 2.8 given to
    title diameter of mm and diameter
    P oche 66B East the pocket 66B East of 1'alésage 66A .at poached 66B East
    locations other than 1 of about 1.1 mm.
    In one embodiment given by way of example, the diameter of the bore 66A adapts to the diameter of the bore 208A of the volume reduction element 208, with the exception of the diameter of l bore 66A in pocket 66B. The diameter of the pocket 66B is larger than the diameter of the bore 66A at parts, along the pole piece 66, outside of piece 66B. The bore 66A of the pole piece 66 defines at least part of the fluid path for the reducer in the injector 12 of FIG. 6 and is the only path for the reducer in or around the pole piece 66.
    In the embodiment given by way of example shown in Figures 6 to 8, the pole piece 66 is welded in place in the fluid injector 12. By having the pole piece (66) welded at a fixed location in the fluid injector 12 and by having the pole piece 66, having the pocket 66B with the spring 50, which is disposed therein, the pole piece 66 serves to provide a fixed calibration by compressing the spring 50 to a height determined in advance, based partly on the location of the pole piece 66 in the injector 12 and on the height of the side wall 66c. This reduces the danger of a calibration change, during temperatures of
    freezing when the reducer can freeze in Ί injector 12 fluid figure 6. In l. ! 'injector 12 of the figure 2, the f < rce d 1 'expansion from a freezing of
    reducer can possibly result in a displacement of the pin 52 for adjusting the spring, which would change the calibration of the fluid injector 12. By having no spring adjustment pin 52, and while the spring 50 is pushed onto the end wall 66D, the pushing force of the spring 50 will not change, due to the pole piece 66 because the piece 66 pole remains fixed and is in one. fixed position in the fluid injector 12, even if the gearbox freezes in the fluid injector 12. As a result, the need to recalibrate the fluid injector 12 of Figure 6 is significantly reduced.
    [47] The exemplary embodiments have been described here by way of illustration and it is understood that the terminology, which has been used, is intended to be of the type of description words, rather than limitation. It goes without saying that many modifications can be made and. variations of the invention in light of the above teachings. The above description is given simply by nature by way of example and modifications can be made without departing from the spirit and scope of the invention.
    权利要求:
    Claims (17)
    [1" id="c-fr-0001]
    REVEN DICATION S
    1. reducer injection unit (10), characterized in that it comprises:
    a fluid injector (12) having a fluid inlet (30) disposed at a first end of the fluid injector (12) for receiving a reducer, and a fluid outlet (32) disposed at a second end of the '' fluid injector (12)
    The path injector of the reducer going from the inlet (30) of the fluid to that of the actuator fluid, comprising (46) polar, disposed fixedly in the injector (12) a movable frame, a coil, arranged to (46) pole and the movable frame (16), and a spring (50);
    a valve assembly, comprising a valve seat, disposed at or near the second end of the fluid injector, and a seal member connected to the frame (16) and capable of cooperating with the valve seat the valve;
    in which the armature (16) comprises an armature pocket, the armature pocket defining, at least in part, the fluid path of the fluid injector in the armature (16) and the part (4 6 ) polar comprises a pole piece pocket defined in a downstream end of the polar piece (46) and which defines, at least in part, the fluid path in the polar piece (46), the armature pocket receiving a first end of the spring (50) and the pocket of the pole piece receiving a second end of the spring (50), the pocket of the frame and the pocket of the pole piece each comprising an end wall with which the first and second ends of the spring (50) respectively come into contact.
    [2" id="c-fr-0002]
    2.
    Gear unit injection unit (10) according to the
    X, in that in the pole piece, the pocket of the fleece.
    [3" id="c-fr-0003]
    3.
    re injection (claim 2, characterized in
    Unit (10) of the pole piece pocket has a diameter which is larger than a diameter of the bore of the polar piece at locations along the polar piece of the polar piece.
    [4" id="c-fr-0004]
    4. Gear unit injection unit (10) according to claim 3, characterized in that the diameter of the pocket of the pole piece is at least twice as large as the diameter of the bore of the pole piece at locations , along the pole piece, other than along the pocket of the pole piece.
    Reducer injection unit (10) according to claim 2, characterized in that the bore of the pole piece defines only the fluid path in or around the pole piece.
    in that following ra 'fluid injector volume reduction element, disposed upstream pole, in an upstream.
    of the pole piece from one end downstream of the volume reduction element
    [5" id="c-fr-0005]
    7. The unit of claim 6, characterized in that the volume reduction element comprises a bore defined therein, the bore of the volume reduction element and the bore of the pole piece forming part of the fluid path of the fluid injector, the bore of the volume reduction element forming the only part of the fluid path in and around the volume reduction element and a diameter of the bore of l The volume reduction element is equal to a diameter of the bore of the pole piece along locations of the pole piece other than along the pocket of the pole piece.
    [6" id="c-fr-0006]
    8. reducer injection unit (10) according to claim 1, characterized in that the pole piece is welded in the fluid injector, so as to be fixed therein, and the spring providing a spring force to the armature, which rests, at least in part, on a location of the pole piece in the injector, a depth of the pocket of the frame and a depth of the pocket of the pole piece.
    [7" id="c-fr-0007]
    9. Fluid injector (12) for a reducer injection unit (10), characterized in that it comprises:
    a fluid inlet (30), disposed at a first end and configured to receive a fluid, and a fluid outlet ((32), disposed at a second end of the fluid injector for discharging the fluid to the fluid injector fluid defining a path, fluid from the fluid inlet (30) to the fluid outlet (32);
    an actuator unit, comprising a pole piece (46), a spring (50) coupled to the pole piece (46) and the movable armature (16) and a coil, disposed near the pole piece (46) and of the movable frame (16), and a valve assembly comprising a valve seat disposed at or near the second end of the fluid injector, and a seal member connected to the frame and capable of cooperate with the valve seat;
    wherein the frame includes a frame pocket receiving a first end of the spring (40) and the pole piece (46) includes a pole piece pocket receiving a second end of the spring (40), each of the frame pocket and of the pole pocket includes an end wall, the end wall of the armature pocket being in contact with the first end of the spring and the end wall of the pole pocket being in contact with the second end of the spring.
    [8" id="c-fr-0008]
    10. Fluid injector (12) according to claim 9, characterized in that the pole piece (46) comprises a bore defined in the pole piece, the bore of the pole piece comprising the pocket of the pole piece and defining the path of fluid in the pole piece.
    [9" id="c-fr-0009]
    11. Fluid injector (12) according to claim
    10, characterized in that the pocket of the pole piece has a diameter which is larger than a diameter of the bore of the pole piece at locations along the pole piece other than along the pocket of the pole piece.
    [10" id="c-fr-0010]
    12. A fluid injector (12) according to claim
    11, characterized in that the diameter of the pocket of the pole piece is more than twice as much as the diameter of the bore of the pole piece at locations, along the pole piece, other than the pocket of the piece polar.
    [11" id="c-fr-0011]
    13. Fluid injector (12) according to claim
    10, characterized in that the fluid path in or around the pole piece is defined only by the bore of the pole piece.
    [12" id="c-fr-0012]
    14. Fluid injector (12) according to claim
    10, characterized in that it further comprises a volume reduction element disposed upstream of the pole piece, one end downstream of. the volume reduction element being arranged in the vicinity of an end upstream of the pole piece.
    [13" id="c-fr-0013]
    15. Fluid injector (12) according to claim
    14, characterized in that the volume reduction element comprises a bore, which is defined therein, and the path of fluid in or around the volume reduction element is defined only by the bore of the element volume reduction.
    [14" id="c-fr-0014]
    16. Fluid injector (12) according to claim
    15, wherein the bore of the volume reduction member is in fluid communication with
    1'alésage of the piece in. lai _re and one diameter of 1'alésage from 1 'element of reduction volume matches has a diameter of 1 bore of the room
    polar.
    [15" id="c-fr-0015]
    17. Fluid injector (12) according to claim
    10, characterized in that the bore of the pole piece receives only the second end of the spring and of the reducer.
    [16" id="c-fr-0016]
    18. Fluid injector (12) according to claim 9, characterized in that the pole piece is welded in the fluid injector, so as to be fixed there.
    [17" id="c-fr-0017]
    19.
    Fluid injector (12) according to Claim 9, characterized in that the fluid injector is arranged in the gear unit and forms part thereof.
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    同族专利:
    公开号 | 公开日
    US20190078482A1|2019-03-14|
    FR3071012B1|2021-04-30|
    DE102018215682A1|2019-05-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US7458530B2|2001-10-05|2008-12-02|Continental Automotive Systems Us, Inc.|Fuel injector sleeve armature|
    DE102008042987A1|2008-10-21|2010-04-22|Robert Bosch Gmbh|Dosing device for use in exhaust gas duct of e.g. diesel engine of passenger car, has valve stem with opening e.g. rectangular running slot, for discharging liquid into gap, where gap is limited by compressible wall|
    US8225602B2|2009-06-11|2012-07-24|Stanadyne Corporation|Integrated pump and injector for exhaust after treatment|
    DE102013201897A1|2013-02-06|2014-08-07|Robert Bosch Gmbh|Valve for metering fluid|DE102015217673A1|2015-09-15|2017-03-16|Continental Automotive Gmbh|Injection device for metering a fluid and motor vehicle with such an injection device|
    US10539057B2|2017-09-14|2020-01-21|Vitesco Technologies USA, LLC|Injector for reductant delivery unit having reduced fluid volume|
    US10502112B2|2017-09-14|2019-12-10|Vitesco Technologies USA, LLC|Injector for reductant delivery unit having fluid volume reduction assembly|
    US10947880B2|2018-02-01|2021-03-16|Continental Powertrain USA, LLC|Injector for reductant delivery unit having fluid volume reduction assembly|
    法律状态:
    2019-09-26| PLFP| Fee payment|Year of fee payment: 2 |
    2020-08-21| PLSC| Search report ready|Effective date: 20200821 |
    2020-09-14| PLFP| Fee payment|Year of fee payment: 3 |
    2021-09-21| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    US201762558458P| true| 2017-09-14|2017-09-14|
    US62558458|2017-09-14|
    US16/127,397|US20190078482A1|2017-09-14|2018-09-11|Injector for reductant delivery unit having reduced fluid volume|
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