DE102020126726A1 - Assembly device for an injection valve of an exhaust gas treatment system of a motor vehicle - Google Patents

Abstract

Mounting device (1) for an injection valve (2) of an exhaust gas treatment system (3) of a motor vehicle with a holding device (4) for attaching the injection valve (2) to a treatment unit (13) of the exhaust gas treatment system (3). The holding device (4) comprises a valve receptacle (14) for inserting the injection valve (2) and a fastening section (24) for connection to the treatment unit (13). The holding device (4) comprises two positioning aids (5) for selectively aligning the injection valve (2) in one mounting position (15, 25) each, so that the injection valve is either in one mounting position (15) or is aligned in the other mounting position (25).

Description

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.

In order to reduce or eliminate the pollutants contained in the exhaust gases of an internal combustion engine of a motor vehicle, exhaust gas aftertreatment is usually carried out. For this purpose, a liquid treatment agent, for example fuel or a urea solution, is usually injected in a targeted manner into the exhaust gases by means of an injection valve.

When assembling the exhaust gas treatment system, the targeted installation of the injection valve generally represents a not inconsiderable effort. Therefore, holding devices are sometimes used for easier assembly of the injection valve. A generic device for mounting an injection valve of an exhaust gas treatment system by means of a holding device is, for example, in EP 2 653 685 A1 described.

In contrast, it is the object of the present invention to improve the assembly of such injectors. In particular, the handling of the holding device and the injection valve that is necessary during assembly is to be simplified in order to save time and money. At the same time, the holding device itself should also be structurally uncomplicated and economical to produce.

This object is achieved by an assembly device having the features of claim 1. Preferred developments of the invention are the subject matter of the dependent claims. Further advantages of the present invention and features result from the general description and the description of the exemplary embodiment.

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

The assembly device according to the invention offers many advantages. The holding device with the two positioning aids for the optional alignment of the injection valve offers a considerable advantage. Effort and costs can be reduced as a result, since only a single holding device is required for the various assembly positions. In addition, only one holding device has to be handled, even if it is mounted on different series or on different sides of the vehicle. It is also particularly advantageous that the positioning aids also ensure automatic and reliable alignment in the selected mounting position. In particular, in the case of the invention, the holding device and the injection valve can be used as identical parts for different vehicle sides or vehicle models.

The positioning aids are preferably arranged in different angular positions, in particular radially, on the valve receptacle. In particular, the positioning aids are arranged in such a way that the injection valve can be used in the assembly positions rotated by a defined angle with respect to an axis of symmetry of the holding device. This is particularly advantageous for use as a common part, for example. In particular, the positioning aids are arranged at the defined angle to one another and/or arranged at the defined angle to the axis of symmetry on the valve receptacle. The rotation takes place in particular about an axis of rotation which is perpendicular to the axis of symmetry.

The injection valve can preferably be used in the assembly positions rotated by an angle of between +/-28° to +/-48° and particularly preferably by an angle of +/-38° with respect to the axis of symmetry of the holding device. This is advantageous, for example, when using the same part on the right and left side of the vehicle. Other suitable angles are also possible. In particular, the bracket is selected as an identical part depending on the intended installation position of the holding device.

In a particularly preferred embodiment, the positioning aids each have at least one positive-locking element. In particular, at least two form-fitting elements are provided. In particular, the positive-locking elements are suitable and designed to positively fix the injection valve in the respective assembly position when it is inserted into the valve receptacle. This offers a particularly reliable positioning aid.

In an advantageous development, the at least one positive-locking element in each case comprises at least one recess formed on the valve receptacle or is formed as such. The cutout is designed in particular as a groove or at least includes one. Additionally or alternatively, the positive-locking element can also include at least one projection formed on the valve receptacle or be formed as such.

In particular, the at least one form-fitting element is arranged on a radial wall of the valve receptacle. The valve receptacle is designed in particular in the manner of a sleeve. In particular, the valve receptacle encloses the injection valve radially at least in sections and/or at least in sections with an axial end face.

In a particularly preferred and advantageous embodiment, the at least one form-fitting element, in particular the recess, is designed as a groove running in the axial direction of the holding device or comprises at least one such groove. In particular, the groove runs in the direction in which the injection valve is moved when it is inserted.

It is possible and advantageous for the valve receptacle to have at least one reserve of installation space. In particular, at least one acoustic and/or thermal shielding element can be used in the available space. The shielding element serves in particular to reduce operating noise from the injection valve. The available space can be arranged radially in the valve receptacle and/or axially on the end face in the valve receptacle. In particular, the available space extends at least partially radially and/or axially around the injection valve used as intended. In particular, the available space is arranged in the area of a coil body of the injection valve. The mounting device can include at least one such shielding element.

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 enclose the injection valve at one axial end each and in particular at opposite axial ends. In particular, the end of the injection valve, which has a nozzle, is at least partially surrounded 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 include at least one such nozzle holder. In particular, the holding device is mounted on the treatment unit 13 by means of the nozzle holder.

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

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 connecting element comprises at least one grooved socket and/or threaded socket or is designed as such. In particular, the connection element is designed in one piece with the rest of the holding device. It is also possible that the holding device comprises 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 that the holding device has at least one connection (e.g. bore) in particular in the form of at least one O-ring carrier, which is used for contacting at least one supply line with the treatment agent to be dosed.

In all of the configurations, it is particularly preferred that the positioning aids are each marked differently with at least one haptically and/or visually perceptible indication. As a result, delays or even errors during assembly of the holding device and the injection valve can be reliably avoided. The haptic cue is advantageous, for example, when the view of the cue is obscured. In particular, the indication is raised and/or deepened. In particular, the notice is incorporated into the holding device. For example, the notice can be lasered and/or pressed. In particular, the reference includes at least one symbol and/or number and/or letter or the like.

It is possible and advantageous for the valve seat to include at least one sealing surface for a sealant to seal the injection valve from the valve seat. In particular, the sealing surface is arranged on an axial end face and/or on a radial inside of the valve receptacle. In particular, the sealing means comprises at least one sealing ring or is designed as such.

In particular, the fastening section can be fastened to the treatment unit and preferably to the nozzle holder by means of at least one screwing means. That allows you to stop bare and at the same time uncomplicated attachment of the holding device. In particular, the screwing means is provided by at least two fastening eyes protruding radially outwards.

In all of the configurations, it is possible for the assembly device to include the at least one injection valve. The injection valve serves in particular to inject 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. As a result, the injection valve can be fixed particularly reliably during assembly. For example, the positioning counterpart is designed as an elevation, particularly if the positioning aid includes a recess 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.

The exhaust gas treatment system is particularly suitable and designed for a diesel engine and/or for an Otto engine. In particular, a fluid is provided as the treatment agent. The treatment agent is preferably liquid. A gaseous treatment agent and for example air is also possible. Fuel or another suitable fuel is particularly preferably used as the treatment agent. A reducing agent containing nitrogen, such as ammonia or urea, can also be used as a treatment agent.

The applicant reserves the right to claim a motor vehicle with an assembly device according to the invention. In this case, the assembly device is designed in particular as described above. In particular, the motor vehicle includes at least one internal combustion engine and, for example, a diesel engine or Otto engine. In particular, the motor vehicle includes at least one exhaust gas treatment system with at least one treatment unit.

Further advantages of the present invention and features result from the exemplary embodiments which are explained below with reference to the enclosed figures.

• 1 eine stark schematisierte Darstellung einer erfindungsgemäßen Montagevorrichtung in einer geschnittenen Seitenansicht;
• 2 eine schematisierte Detaildarstellung einer Halteeinrichtung einer erfindungsgemäßen Montagevorrichtung in einer perspektivischen Ansicht;
• 3 die Halteeinrichtung der 2 in einer Vorderansicht; und
• 4 die Halteeinrichtung der 2 in einer Draufsicht.

In the figures show:

• 1 a highly schematic representation of a mounting device according to the invention in a sectional side view;
• 2 a schematic detailed representation of a holding device of a mounting device according to the invention in a perspective view;
• 3 the holding device 2 in a front view; and
• 4 the holding device 2 in a top view.

the 1 shows a detail 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 for an Otto engine. In order to reduce pollutants, a liquid treatment agent and, for example, fuel are supplied to the exhaust gases here in a targeted manner by means of an injection valve 2 .

The injection valve 2 is attached to the treatment unit 13 using an assembly device 1 according to the invention. The holding device 4 is fastened to the treatment unit 3 here by means of a nozzle holder 23 .

In order to seal off the injection valve 2 from the holding device 4 , a sealing means 19 and, for example, a sealing ring are arranged here 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 connection element 8 and, for example, a grooved connector.

In order to simplify assembly and to keep costs for production, warehousing and logistics low, the holding device 4 here offers the accommodation of the injection valve 2 in two different assembly positions 15, 25. In the exhaust gas treatment system 3 shown here, the injection valve 2 is in the first assembly position 15 deployed. So that the assembly positions 15, 25 can be assumed safely and quickly during assembly, the holding device 4 is equipped with two positioning aids 5 here. The positioning aids 5 are described in more detail with reference to the following figures.

In one embodiment, the injection valve 2 shown here can have positioning counterparts 12 which are matched to the positioning aids 5 of the holding device 4 . For example, the positioning counterparts 12 correspond at on set the injection valve 2 in such a way, each with a positioning aid 5, that there is a form fit.

Related to the 2 until 4 the holding device 4 of the assembly device 1 described above will now be described in more detail. The positioning aids 5 are each provided here by a form-fitting element 6 . The positive-locking elements are each designed as a recess 16, for example. The recess 16 is incorporated here as a groove 26 in a radial wall 34 of the valve receptacle 14 . The grooves 26 run in the axial direction of the holding device 4.

In order to ensure that the respective positioning aid 5 is selected quickly and correctly during assembly, the positioning aids 5 are each provided with a note 55 here. The indicia 55 are provided by the letters L and R raised. As a result, it can be recognized both optically and haptically in which groove 26 the injection valve 2 must be inserted in order to be installed correctly on a left-hand side of the vehicle (L) or on the right-hand side of the vehicle (R).

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

In the valve receptacle 14 a space provision 7 is formed here, which is used to accommodate an acoustic and / or thermal shielding element not shown here. The available space 7 is arranged in such a way 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 .

In the 4 the radial orientation of the positioning aids 5 can be seen particularly well. The positioning aids 5 are arranged radially on the valve receptacle 14 here in different angular positions. As a result, the injection valve 2 can be used in the respectively desired assembly positions 15, 25 rotated by a defined angle 35 with respect to an axis of symmetry 45 of the holding device 4.

An angle of +38° is provided here as an example for the angle of the first mounting position 25 (L). For the other mounting position 15 (R), an angle of -38° is provided here. Such angles are then necessary, for example, in order 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 the left side of the vehicle.

Reference List

1

assembly device

2

injector

3

exhaust treatment system

4

holding device

5

positioning aid

6

interlocking element

7

space available

8th

connection element

9

sealing surface

12

positioning counterpart

13

treatment unit

14

valve mount

15

mounting position

16

recess

19

sealant

23

nozzle holder

24

attachment section

25

mounting position

26

groove

34

wall

35

angle

44

bolting means

45

axis of symmetry

55

a notice

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 2653685 A1 [0003]

Claims (15)

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), 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 in that the holding device (4) has at least two positioning aids (5) for the optional alignment of the injection valve (2) in one mounting position (15, 25) so that the injection valve is aligned either in one mounting position (15) or in the other mounting position (25) when it is inserted into the valve receptacle (14). 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) rotates at a defined angle (35) with respect to an axis of symmetry (45) of the holding device ( 4) rotated in the assembly positions (15, 25) can be used. Mounting device (1) according to the preceding claim, in which the injector (2) rotates at an angle (35) of between +/- 28° to +/- 48° and preferably at an angle (35) of +/- 38° to that of the axis of symmetry (45) of the holding device (4) rotated in the assembly positions (15, 25) can be used. Assembly device (1) according to one of the preceding claims, wherein the positioning aids (5) each have at least one form-fitting element (6) and wherein the form-fitting elements (6) the injection valve (2) when inserted into the valve receptacle (14) in the respective assembly position ( 15, 25) in a form-fitting manner. Assembly device (1) according to the preceding claim, wherein the respective at least one positive-locking element (6) comprises at least one recess (16) formed on the valve receptacle (14) or is formed as such. Mounting device (1) according to one of the two preceding claims, wherein the respective at least one form-fitting element (6) is arranged on a radial wall (34) of the valve receptacle (14). Mounting device (1) according to one of the three preceding claims, wherein the respective at least one form-fitting element (6) is designed as a groove (26) running in the axial direction of the holding device (4). Mounting device (1) according to one of the preceding claims, in which the valve receptacle (14) has at least one installation space reserve (7) into which at least one acoustic and/or thermal shielding element can be inserted. 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) each have the injection valve (2) on one enclose the axial end at least partially. Mounting device (1) according to one of the preceding claims, wherein the holding device (4) is designed in one piece and is preferably manufactured as a cast part or as a turned and/or milled part. Mounting device (1) according to one of the preceding claims, wherein the holding device (4) comprises at least one connection element (8), in particular a grooved socket and/or threaded socket, for connecting a supply line for a treatment agent to be injected and/or wherein the holding device (4) comprises at least one permanently attached supply line included. Mounting device (1) according to one of the preceding claims, wherein the positioning aids (5) are each marked differently with at least one haptically and/or optically perceptible indication (55). Assembly device (1) according to one of the preceding claims, wherein the valve receptacle (14) on an axial end side comprises at least one sealing surface (9) for a sealing means (19) for sealing the injection valve (2) relative to the valve receptacle (14). Mounting device (1) according to one of the preceding claims, in which the fastening section (24) can be fastened to the treatment unit (13) by means of at least one screwing means (44). 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), the injection valve (2) having at least one positioning counterpart for each positioning aid (5) of the holding device (4). (12), which when inserting the injector (2) in the valve measurement (14) corresponds to the respective positioning aid (5).

Images