Mounting device for an injection valve of an exhaust aftertreatment system of a motor vehicle

Abstract

Mounting device (1) for an injection valve (2) of an exhaust treatment system (3) of a motor vehicle, comprising at least one holding device (4) for attaching the injection valve (2) to a treatment unit (13) of the exhaust treatment system (3), wherein the holding device (4) has at least one valve receptacle (14) for inserting the injection valve (2) and at least one fastening section (24) for connecting to the treatment unit (13), characterized in that the holding device (4) comprises at least two positioning aids (5) for selectively aligning the injection valve (2) in one mounting position (15, 25), so that when inserted into the valve receptacle (14) the injection valve is aligned either in one mounting position (15) or in the other mounting position (25).

Description

[0001] The present invention relates to a mounting device for an injection valve of an exhaust gas treatment system of a motor vehicle according to the preamble of claim 1.

[0002] To reduce or eliminate the pollutants contained in the exhaust gases of a motor vehicle's internal combustion engine, exhaust aftertreatment is typically performed. This usually involves injecting a liquid treatment agent, such as fuel or a urea solution, into the exhaust gases using an injection valve.

[0003] When assembling an exhaust gas treatment system, the targeted installation of the injection valve generally represents a considerable effort. Therefore, holding devices are sometimes used to simplify the installation of the injection valve. A generic device for mounting an injection valve of an exhaust gas treatment system using a holding device is described, for example, in EP 2 653 685 A1.

[0004] DE 102 24 241 A1 discloses a fuel injection valve for internal combustion engines with an injection nozzle clamped to a nozzle holder or injector. The injection nozzle has a nozzle body and a nozzle needle. The nozzle needle is axially displaceable in a bore in the nozzle body. The nozzle body contains at least one marking or at least one key surface for aligning the nozzle body relative to the nozzle holder or injector.

[0005] DE 10 2005 016 865 A1 discloses a fuel injector for injecting fuel into an internal combustion engine, having a leakage outlet for discharging the uninjected fuel from the fuel injector. A leakage connection is attached to the leakage outlet using a connecting component. The connecting component is designed so that it can be attached to the leakage nipple in two mounting positions. In the first mounting position, the connecting component can be pre-assembled to the leakage nipple. By moving the connecting component to the second mounting position, the leakage nipple can be attached to the fuel injector.

[0006] In contrast, the object of the present invention is to improve the assembly of such injection valves. In particular, the handling of the holding device and the injection valve required during assembly should be simplified in order to save time and costs. At the same time, the holding device itself should be structurally simple and economical to manufacture.

[0007] This object is achieved by a mounting device having the features of claim 1. Preferred developments of the invention are the subject of the dependent claims. Further advantages of the present invention and features will become apparent from the general description and the description of the exemplary embodiment.

[0008] The mounting device according to the invention is provided for an injection valve of an exhaust gas treatment system of a motor vehicle. In particular, the mounting device serves for mounting such an injection valve on an exhaust gas treatment system. The mounting device comprises at least one holding device for attaching the injection valve to a treatment unit of the exhaust gas treatment system. The holding device comprises at least one valve receptacle for inserting the injection valve. In particular, the injection valve can be inserted into the valve receptacle. The holding device comprises at least one fastening section for connecting the holding device to the treatment unit. The holding device comprises at least two positioning aids for selectively aligning the injection valve in a respective mounting position.The holding device is suitable and designed to align the injection valve when inserted into the valve seat either (only) in one mounting position or (only) in the other mounting position (automatically).

[0009] The assembly device according to the invention offers many advantages. A significant advantage is the holding device with the two positioning aids for the optional alignment of the injection valve. This reduces effort and costs, as only a single holding device is required for the various assembly positions. Furthermore, only one holding device needs to be handled, even when assembling on different model series or on different vehicle sides. Another particularly advantageous feature is that the positioning aids simultaneously ensure automatic and secure alignment in the selected assembly position. In particular, the holding device and the injection valve can be used as identical parts for different vehicle sides or vehicle models.

[0010] Preferably, the positioning aids are arranged in different angular positions, in particular radially, on the valve seat. In particular, the positioning aids are arranged such that the injection valve can be inserted into the assembly positions rotated by a defined angle relative to an axis of symmetry of the holding device. This is particularly advantageous, for example, for use as a common part. In particular, the positioning aids are arranged at the defined angle to one another and / or at the defined angle to the axis of symmetry on the valve seat. The rotation occurs in particular about a rotation axis that is perpendicular to the axis of symmetry.

[0011] Preferably, the injection valve can be used in the mounting positions rotated by an angle between + / - 28° and + / - 48°, and particularly preferably by an angle of + / - 38° relative to the symmetry axis of the holding device. This is advantageous, for example, for use as a common part on the right and left sides of the vehicle. Other suitable angles are also possible. In particular, the angle is selected depending on the intended installation position of the holding device as a common part.

[0012] In a particularly preferred embodiment, the positioning aids each have at least one positive-locking element. In particular, at least two positive-locking elements are provided. In particular, the positive-locking elements are suitable and designed to positively secure the injection valve in the respective assembly position when inserted into the valve receptacle. This provides a particularly reliable positioning aid.

[0013] In an advantageous development, the at least one form-locking element comprises or is designed as at least one recess formed on the valve receptacle. The recess is in particular designed as a groove or comprises at least one such recess. Additionally or alternatively, the form-locking element can also comprise or be designed as at least one projection formed on the valve receptacle.

[0014] In particular, the at least one form-locking element is arranged on a radial wall of the valve receptacle. The valve receptacle is particularly sleeve-shaped. In particular, the valve receptacle surrounds the injection valve at least partially radially and / or at least partially with an axial end face.

[0015] In a particularly preferred and advantageous embodiment, the at least one form-locking element, in particular the recess, is designed as a groove extending in the axial direction of the holding device or comprises at least one such groove. In particular, the groove extends in the direction in which the injection valve is moved during insertion.

[0016] It is possible and advantageous for the valve receptacle to have at least one installation space allowance. In particular, at least one acoustic and / or thermal shielding element can be inserted into the installation space allowance. The shielding element serves, in particular, to reduce operating noise of the injection valve. The installation space allowance can be arranged radially in the valve receptacle and / or axially on the front side of the valve receptacle. In particular, the installation space allowance extends at least partially radially and / or axially around the injection valve used as intended. In particular, the installation space allowance is arranged in the region of a coil body of the injection valve. The mounting device can comprise at least one such shielding element.

[0017] The fastening section can preferably be mounted on at least one nozzle holder of the treatment unit. The nozzle holder and the valve receptacle preferably each enclose the injection valve at one axial end and in particular at opposite axial ends. In particular, the end of the injection valve which has a nozzle is at least partially enclosed by the nozzle holder. In particular, the end of the injection valve which has a connection element for a supply line for the treatment agent is at least partially enclosed by the valve receptacle. The mounting device can comprise at least one such nozzle holder. In particular, the holding device is mounted on the treatment unit 13 by means of the nozzle holder.

[0018] In all embodiments, it is particularly preferred that the holding device be formed in one piece. The holding device is particularly preferably manufactured as a cast part and / or a turned part and / or a milled part. Other suitable manufacturing methods are also possible.

[0019] In particular, the holding device comprises at least one connection element for connecting a supply line for a treatment agent to be injected. In particular, the connection element comprises at least one grooved socket and / or threaded socket or is designed as such. In particular, the connection element is designed as one piece with the rest of the holding device. It is also possible for the holding device to comprise at least one permanently attached supply line. For example, the supply line can be attached by soldering and / or gluing and / or pressing. It is also possible for the holding device to have at least one connection (e.g., bore), in particular in the form of at least one O-ring carrier, which serves to contact at least one supply line with the treatment agent to be metered in.

[0020] In all embodiments, it is particularly preferred that the positioning aids are each differently marked with at least one haptic and / or visually perceptible indication. This can reliably prevent delays or even errors during assembly of the holding device and the injection valve. The haptic indication is advantageous, for example, when the view of the indication is obscured. In particular, the indication is raised and / or recessed. In particular, the indication is incorporated into the holding device. For example, the indication can be lasered and / or pressed in. In particular, the indication comprises at least one symbol and / or a number and / or a letter or the like.

[0021] It is possible and advantageous for the valve receptacle to comprise at least one sealing surface for a sealing means for sealing the injection valve relative to the valve receptacle. In particular, the sealing surface is arranged on an axial end face and / or on a radial inner side of the valve receptacle. The sealing means, in particular, comprises at least one sealing ring or is designed as such.

[0022] In particular, the fastening section can be fastened to the treatment unit and preferably to the nozzle holder by means of at least one screw. This enables a durable yet inexpensive fastening of the holding device. In particular, the screw is provided by at least two radially outwardly projecting fastening eyes.

[0023] In all embodiments, it is possible for the mounting device to comprise at least one injection valve. The injection valve is used in particular for injecting a treatment agent into the treatment unit. In particular, the injection valve has at least one positioning counterpart for each positioning aid of the holding device. In particular, the positioning counterpart corresponds to the respective positioning aid when the injection valve is inserted into the valve receptacle. This allows the injection valve to be fixed particularly reliably during assembly. For example, the positioning counterpart is designed as an elevation, in particular when the positioning aid comprises a cutout and, for example, a groove. For example, the positioning counterpart is designed as a recess, in particular when the positioning aid is designed as a projection or the like.

[0024] The exhaust gas treatment system is particularly suitable and designed for a diesel engine and / or a gasoline engine. A fluid is provided as the treatment agent. Preferably, the treatment agent is liquid. A gaseous treatment agent, such as air, is also possible. Fuel or another suitable fuel is particularly preferably used as the treatment agent. A nitrogen-containing reducing agent, such as ammonia or urea, can also be used as the treatment agent.

[0025] The applicant reserves the right to claim a motor vehicle with a mounting device according to the invention. The mounting device is designed, in particular, as described above. In particular, the motor vehicle comprises at least one internal combustion engine, for example, a diesel engine or gasoline engine. In particular, the motor vehicle comprises at least one exhaust gas treatment system with at least one treatment unit.

[0026] Further advantages and features of the present invention will become apparent from the embodiments which are explained below with reference to the accompanying figures.

[0027] The figures show: Fig. 1 a highly schematic representation of an assembly device according to the invention in a sectional side view; Fig. 2 a schematic detailed representation of a holding device of an assembly device according to the invention in a perspective view; Fig. 3 the holding device of the Fig. 2 in a front view; and Fig. 4 the holding device of the Fig. 2 in a top view.

[0028] The Fig. Figure 1 shows a section of an exhaust gas treatment system 3 with a treatment unit 13 of a motor vehicle (not shown in detail here). The exhaust gas treatment system 3 can be used, for example, for a diesel engine or a gasoline engine. To reduce pollutants, a liquid treatment agent and, for example, fuel are selectively fed into the exhaust gases by means of an injection valve 2.

[0029] The injection valve 2 is attached to the treatment unit 13 using a mounting device 1 according to the invention. For this purpose, the mounting device 1 comprises a holding device 4 with a valve receptacle 14 for inserting the injection valve 2 and a fastening section 24 for connecting the holding device 4 to the treatment unit 13. The holding device 4 is attached to the treatment unit 3 by means of a nozzle holder 23.

[0030] To seal the injection valve 2 from the holding device 4, a sealing means 19 and, for example, a sealing ring are arranged on a sealing surface 9 of the valve receptacle 14. To connect a supply line for the treatment agent to be injected, the holding device 4 is designed here with a connecting element 8 and, for example, a grooved nozzle.

[0031] To simplify assembly and keep manufacturing, warehousing, and logistics costs low, the holding device 4 here accommodates the injection valve 2 in two different mounting positions 15, 25. In the exhaust gas treatment system 3 shown here, the injection valve 2 is inserted in the first mounting position 15. To ensure that the mounting positions 15, 25 can be adopted safely and quickly during assembly, the holding device 4 is equipped with two positioning aids 5. The positioning aids 5 will be described in more detail with reference to the following figures.

[0032] The injection valve 2 shown here can, in one embodiment, have positioning counterparts 12 that are matched to the positioning aids 5 of the holding device 4. For example, when inserting the injection valve 2, the positioning counterparts 12 each correspond to a positioning aid 5 in such a way that a positive fit is achieved.

[0033] With reference to the Fig. 2 to 4, the holding device 4 of the previously described assembly device 1 will now be described in more detail. The positioning aids 5 are each provided by a form-locking element 6. The form-locking elements are each designed, for example, as a recess 16. The recess 16 is here incorporated as a groove 26 in a radial extension 34 of the valve receptacle 14. The grooves 26 extend in the axial direction of the holding device 4.

[0034] To ensure quick and correct selection of the respective positioning aid 5 during assembly, the positioning aids 5 are each provided with a marking 55. The markings 55 are provided by the raised letters L and R. This allows both visual and tactile recognition of the groove 26 in which the injection valve 2 must be inserted in order to be correctly installed on the left side of the vehicle (L) or on the right side of the vehicle (R).

[0035] It is also clearly visible that the fastening section 24 is equipped with two screwing means 44 in order to be screwed to the nozzle holder 23. In addition, Fig. 2 the sealing surface 9 for the sealing agent 19 incorporated within the valve seat 14 can be clearly seen.

[0036] A spacer 7 is formed in the valve receptacle 14, which serves to accommodate an acoustic and / or thermal shielding element (not shown in detail here). The spacer 7 is arranged such that the shielding element and, for example, an acoustic and / or thermal cap can enclose an injector coil body of the installed injection valve 2.

[0037] In the Fig. 4, the radial alignment of the positioning aids 5 is particularly clearly visible. Here, the positioning aids 5 are arranged radially on the valve seat 14 at different angular positions. This allows the injection valve 2 to be rotated by a defined angle 35 relative to an axis of symmetry 45 of the holding device 4 and inserted into the desired mounting positions 15, 25.

[0038] For example, an angle of +38° is provided for the first mounting position 25 (L). For the other mounting position 15 (R), an angle of -38° is provided. Such angles are necessary, for example, to enable the use of the holding device 4 in combination with the exhaust gas treatment system 3 shown here on either the right or left side of the vehicle. List of reference symbols: 1 mounting device 2 injection valve 3 Exhaust gas treatment system 4 Holding device 5 Positioning aid 6 Form-locking element 7 Installation space reserve 8 connecting element 9 Sealing surface 12 Positioning counterpart 13 treatment units 14 Valve holder 15 Mounting position 16 recess 19 Sealant 23 nozzle holders 24 Fastening section 25 Mounting position 26 grooves 34 wall 35 angles 44 screw fasteners 45 axis of symmetry 55 Note

Claims

[1] Mounting device (1) for an injection valve (2) of an exhaust gas treatment system (3) of a motor vehicle, comprising at least one holding device (4) for attaching the injection valve (2) to a treatment unit (13) of the exhaust gas treatment system (3), wherein the holding device (4) has at least one valve receptacle (14) for inserting the injection valve (2) and at least one fastening section (24) for connection to the treatment unit (13), characterized by that the holding device (4) comprises at least two positioning aids (5) for selectively aligning the injection valve (2) in one mounting position each (15, 25), so that the injection valve is aligned either in one mounting position (15) or in the other mounting position (25) when inserted into the valve receptacle (14). [2] Mounting device (1) according to the preceding claim, wherein the positioning aids (5) are arranged in different angular positions radially on the valve receptacle (14), so that the injection valve (2) can be inserted into the mounting positions (15, 25) rotated by a defined angle (35) relative to an axis of symmetry (45) of the holding device (4). [3] Mounting device (1) according to the preceding claim, wherein the injection valve (2) can be inserted into the mounting positions (15, 25) rotated by an angle (35) between + / - 28° to + / - 48° and preferably by the angle (35) + / - 38° relative to the axis of symmetry (45) of the holding device (4). [4] Mounting device (1) according to one of the preceding claims, wherein the positioning aids (5) each have at least one positive locking element (6) and wherein the positive locking elements (6) fix the injection valve (2) in a positive locking manner in the respective mounting position (15, 25) when inserted into the valve receptacle (14). [5] Mounting device (1) according to the preceding claim, wherein the at least one form-locking element (6) comprises at least one recess (16) formed on the valve receptacle (14) or is designed as such. [6] Mounting device (1) according to one of the two preceding claims, wherein the at least one form-locking element (6) is arranged on a radial wall (34) of the valve receptacle (14). [7] Mounting device (1) according to one of the three preceding claims, wherein the at least one form-locking element (6) is designed as a groove (26) extending in the axial direction of the holding device (4). [8] Mounting device (1) according to one of the preceding claims, wherein the valve receptacle (14) has at least one installation space (7) into which at least one acoustic and / or thermal shielding element can be inserted. [9] Mounting device (1) according to one of the preceding claims, wherein the fastening section (24) can be mounted on a nozzle holder (23) of the treatment unit (3) and wherein the nozzle holder (23) and the valve receptacle (14) at least partially enclose the injection valve (2) at one axial end each. [10] Mounting device (1) according to one of the preceding claims, wherein the holding device (4) is formed in one piece and is preferably manufactured as a cast part or as a turned and / or milled part. [11] Mounting device (1) according to one of the preceding claims, wherein the holding device (4) comprises at least one connecting element (8), in particular grooved connector and / or threaded connector, for connecting a supply line for a treatment agent to be injected and / or wherein the holding device (4) comprises at least one fixedly attached supply line. [12] Mounting device (1) according to one of the preceding claims, wherein the positioning aids (5) are each differently marked with at least one haptically and / or optically perceptible indication (55). [13] Mounting device (1) according to one of the preceding claims, wherein the valve receptacle (14) comprises on an axial end face at least one sealing surface (9) for a sealing means (19) for sealing the injection valve (2) relative to the valve receptacle (14). [14] Mounting device (1) according to one of the preceding claims, wherein the fastening section (24) can be fastened to the treatment unit (13) by means of at least one screwing means (44). [15] Mounting device (1) according to one of the preceding claims, comprising the at least one injection valve (2) for injecting a treatment agent into the treatment unit (13), wherein the injection valve (2) has at least one positioning counterpart (12) for each positioning aid (5) of the holding device (4), which corresponds to the respective positioning aid (5) when the injection valve (2) is inserted into the valve receptacle (14).

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