Cable connection

Abstract

A cable connection (16) for a dosing module (6) for exhaust gas reduction, with a dosing module end (16b), which is designed for connection to the dosing module (6), and an end (16a) distant from the dosing module, comprising at least one electrical cable (19a, 19b) having at least one electrical conductor (28a, 28b) and a cable insulation (15a, 15b) surrounding the at least one electrical conductor (28a, 28b). The cable connection (16) is crimped in one region (26a) at the dosing module end (16b) of the cable connection (16). In the crimped region, a space (36) between the at least one electrical conductor (28a, 28b) and the cable insulation (15a, 15b) surrounding the at least one electrical conductor (28a, 28b) is filled with a silicone material (17a, 17b).

Claims

1. A cable connection (16) for a dosing module (6) for exhaust gas reduction, the cable connection comprising a dosing module end (16b), which is configured to be connected to the dosing module (6), and an end (16a) distant from the dosing module, wherein the cable connection (16) also comprises at least one electrical cable (19a, 19b) having at least one electrical conductor (28a, 28b) and a cable insulation (15a, 15b) surrounding the at least one electrical conductor (28a, 28b); wherein the cable connection (16) is crimped in a crimped region (26a) at the dosing module end (16b) of the cable connection (16); and wherein in the crimped region, a space (36) between the at least one electrical conductor (28a, 28b) and the cable insulation (15a, 15b) surrounding the at least one electrical conductor (28a, 28b) is filled with a silicone material (17a, 17b).

2. The cable connection (16) according to claim 1, wherein the at least one electrical cable includes at least two electrical cables (19a, 19b), wherein the electrical conductor (28a, 28b) in each of the at least two electrical cables (19a, 19b) is enclosed by a silicone material (17a, 17b).

3. The cable connection (16) according to claim 1, wherein the at least one electrical cable (19a, 19b) comprises at least two electrical conductors (28a, 28b), and wherein a space (38) between the at least two electrical conductors (28a, 28b) is filled with the silicone material (17a, 17b).

4. The cable connection (16) according to claim 1, wherein the at least one electrical conductor (28a, 28b) is connected to a connecting module (22) at the dosing module end (16b) of the cable connection (16).

5. The cable connection (16) according to claim 1, wherein a plug connector (22) is provided at the end (16a) of the cable connection (16) distant from the dosing module.

6. The cable connection (16) according to claim 1, wherein the space (36) between the at least one electrical conductor (28a, 28b) and the surrounding cable insulation (15a, 15b) is filled with a silicone material (17a, 17b) also in a region (26b) at the end (16a) of the cable connection (16) distant from the dosing module.

7. A dosing module (6) configured to inject a reducing agent (10) into the exhaust gas line (2) of an internal combustion engine (4), the dosing module having a cable connection (16) according to claim 1.

8. The dosing module (6) according to claim 7, wherein the dosing module end (16b) of the cable connection (16) is electrically connected to the dosing module (6).

9. An exhaust gas line (2) of an internal combustion engine (4) having a dosing module (6) according to claim 7.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention shall now be explained with the aid of the enclosed figures.

(2) FIG. 1 shows an exhaust gas line of an internal combustion engine with a dosing module for the injecting of a reducing agent into the exhaust gas line in a schematic representation.

(3) FIG. 2 shows a perspective view of an electrical cable connection according to one exemplary embodiment of the invention.

(4) FIG. 3 shows a schematic sectional view of a dosing module end of a cable connection according to one exemplary embodiment of the invention.

(5) FIG. 4 shows a section through an electrical cable of a cable connection according to the invention orthogonally to the section shown in FIG. 3.

DETAILED DESCRIPTION

(6) FIG. 1 shows in a schematic representation an internal combustion engine 4 with an exhaust gas line 2 and a dosing module 6 for injecting a reducing agent 10, especially an aqueous solution of urea, into the exhaust gas line 2.

(7) The dosing module 6 is situated between the internal combustion engine 4 and an SCR catalyst 7, i.e., it is connected upstream from the SCR catalyst 7. The dosing module 6 comprises a dispensing valve 20, making it possible to inject, by suitable actuating of the dispensing valve 20, a desired quantity of reducing agent 10 into an exhaust gas duct 3 of the exhaust gas line 2. By a prefeed pump 8, the reducing agent 10 to be injected is withdrawn from a storage tank 12 and supplied to the dosing module 6, for example with a pressure of 2 to 3 bar. The dosing module 6 injects the reducing agent 10 with an elevated pressure into the exhaust gas duct 3 of the exhaust gas line 2. In the exhaust gas duct 3, the injected reducing agent 10 mixes with the exhaust gases 14 of the internal combustion engine 4 flowing through the exhaust gas duct 3 and reacts in the SCR catalyst 7, situated downstream from the dosing module 6, with the nitrogen oxides (NO.sub.x) contained in the exhaust gases 14, thereby reducing them to N.sub.2 and H.sub.2O.

(8) The dosing module 6 is connected across an electrical cable connection 16, having two electrical cables 19a, 19b, to a control device 18. The control device 18 is designed to actuate the dosing module 6 each time in accordance with the current operating state of the internal combustion engine 4.

(9) The electrical cables 19a, 19b are connected across a cable adapter 22 to the dosing module 6.

(10) FIG. 2 shows a perspective view of an electrical cable connection 16 according to one exemplary embodiment of the invention with a dosing module-side region 26a and a region 26b distant from the dosing module.

(11) The cable connection 16 comprises two electrical cables 19a, 19b. The two electrical cables 19a, 19b are at least partly surrounded by a common jacket 30.

(12) At a dosing module end 16b, the electrical cable connection 16 is provided with a connecting module 22, which is designed for the electrical connecting of the cable connection 16 to a dosing module 6, not shown in FIG. 2.

(13) At an opposite end 16a of the cable connection 16 facing away from the dosing module 6 (not shown), a plug connector 24 is provided, making it possible to connect the end 16a of the cable connection 16 distant from the dosing module electrically to a control device 18, for example, not shown in FIG. 2.

(14) FIG. 3 shows a schematic sectional view of a region 26a at the dosing module end 16b of a cable connection 16 according to one exemplary embodiment of the invention.

(15) In the exemplary embodiment shown in FIG. 3, the cable connection 16 comprises two electrical cables 19a, 19b. The skilled person understands that the cable connection 16 may also have more or fewer than two electrical cables 19a, 19b. Each of the two electrical cables 19a, 19b respectively contains multiple electrical conductors, such as stranded conductors, 28a, 28b.

(16) FIG. 4 shows a section through an electrical cable 19a of the cable connection 16 along the plane A-A (see FIG. 3), i.e., orthogonally to the section represented in FIG. 3.

(17) The electrical conductors 28a, 28b of the two electrical cables 19a, 19b are respectively enclosed by a cable insulation 15a, 15b made from an electrically insulating material, especially a suitable plastic material.

(18) The space between the electrical conductors 28a, 28b and the cable insulation 15a, 15b is filled respectively with a silicone material 17a, 17b. The silicone material 17a, 17b entirely encloses the electrical conductors 28a, 28b, so that the electrical conductors 28a, 28b are embedded in the silicone material 17a, 17b. The silicone material 17a, 17b in particular fills not only the outer space 36 between the electrical conductors 28a, 28b and the surrounding cable insulation 15a, but also all the hollow spaces, especially also the internal spaces 38 between the individual electrical conductors 28a, 28b (see FIG. 4).

(19) At least one partial region 26a of the cable connection 16 at the dosing module side is crimped by a crimp element 32, such as a hexagonal crimp element 32, which lies against a housing wall 34 of the dosing module 35.

(20) The silicone material 17a, 17b prevents media and/or moisture from being able to penetrate into the electrical conductors 28a, 28b, especially if the cable insulation 15a, 15b is damaged and has hairline cracks, for example, which may be caused e.g. by the crimping.

(21) The risk of failure or even damaging of the dosing module and/or corrosion of the electrical conductors 28a, 28b by the penetration of media, especially reducing agent or cooling water, rain water, and/or other moisture through (hairline) cracks in the cable insulation 15a, 15b may be significantly reduced in this way in an economical manner.