DE102011056780A1 - Electric device e.g. distance sensor, has case positioned in housing inner space and comprising case inner space by which cable is conducted, where case inner space is connected with cable and wall, which surrounds feedthrough space - Google Patents

Abstract

The device (10) has a cable (24) guided through a passage recess (22) of a housing (12) from an outside space into a housing inner space. A wall i.e. diagonally oriented seal lip, is arranged on the passage recess at the housing and points into the housing inner space. The wall surrounds a feedthrough space through which the cable is guided. A case i.e. annular element, is positioned in the housing inner space and comprises a case inner space by which the cable is conducted, where the case inner space is connected with the cable and the wall. An independent claim is also included for a method for manufacturing an electric device.

Description

The invention relates to an electrical device, comprising a housing which defines a housing interior, and at least one cable, which is guided through a through-passage in the housing from an external space into the housing interior.

The invention further relates to a method for producing an electrical device.

From the DE 10 2007 004 896 A1 an assembly of a housing body with passage for receiving a connection cable is known, comprising a provided on the front side of the housing body in the region of the implementation and surrounding, preferably annular adapter, in the interior of the housing body reaching into the ends of the connection cable and means for sealing the connection cable in Area of implementation and / or the adapter. The adapter is designed as a Stülpkonturadapter and integrally formed on the housing body or connected thereto. The connecting cable has an encapsulation with at least one sealing lamella, wherein the encapsulation extends over a cable longitudinal section, which is greater than the longitudinal extent of the Stülpkonturadapters. On the connection cable a cap is located, wherein after the introduction of the connection cable in the housing body on the implementation of a Stülpkonturadapter the cap with its housing-side end pressed onto the Stülpkonturadapter and after positioning of the connection cable crimping between the housing distant end of the cap and a portion of the encapsulation he follows.

From the US 4,712,296 For example, a method of making an electrical connector is known with a coaxial cable.

The invention has for its object to provide an electrical device of the type mentioned, in which can be achieved in a simple manufacturing manner, a tight connection of the cable.

This object is achieved with the above-mentioned electrical device according to the invention in that a wall is arranged on the housing at the at least one through-hole, which faces into the housing interior and surrounds the lead-through space through which the cable is guided, and a sleeve is provided, which is positioned in the housing interior, having an interior through which the cable is performed and connected to the cable and the wall.

By connecting the sleeve to the wall, the connection (such as jamming) of the sleeve to the cable is optimized. In particular, a clamping force can be increased.

In principle, the sleeve can be connected to the wall and to the cable via a press fit. It may also be provided a connection via a melting. As a result, a fluid-tight connection is obtained in a production-wise simple manner, it also being possible to produce compressive forces during a melting process which improve, for example, an interference fit of the cable on the sleeve. This in turn improves the fluid tightness.

By the solution according to the invention can be achieved in a very short way a secure connection to effect a strain relief of the cable. This allows the immersion height, which is required for fixing the cable to the housing, keep low.

It is advantageous if the sleeve is made of a plastic material. As a result, for example, a connection via ultrasonic welding or friction welding can be realized in a simple manner.

For the same reason, it is advantageous if the wall is made of a plastic material.

It is particularly advantageous if the sleeve is connected to the cable and / or the wall by melting. As a result, a connection with high fluid tightness can be achieved over a short distance. It can realize a high strain relief in a relatively short way. About the melting can be achieved an additional clamping force. For example, if there is a fusing connection between the sleeve and the wall, an increased clamping force between the sleeve and the cable can be realized.

In particular, the sleeve is connected to the cable and / or the wall by ultrasonic welding or friction welding. By ultrasonic welding or friction welding can be achieved a corresponding Anschmelzverbindung.

It is particularly advantageous if a cable sheath of the cable and the sleeve are made by the same base material. This allows an optimized merger to be achieved. The material for sleeve and cable sheath does not have to be identical. For example, the material for the cable sheath and the sleeve on the same plastic base such as TPU (thermoplastic PU), wherein the hardness of the corresponding material for cable sheath and sleeve is different.

For the same reason, it is favorable if the wall and the sleeve are made of the same base material. In particular, they are made of the same material.

It may alternatively or additionally be provided that the sleeve is connected to the cable and / or the wall at least partially by an interference fit. Such an interference fit can be produced in a simple and fast manner.

It is advantageous if the sleeve is designed as a ring element. As a result, an interior is provided in a simple manner, through which the cable is feasible. By training as a ring element in particular uniform clamping forces can exert on the cable to its fixation and strain relief.

Conveniently, the interior is limited by a sleeve wall.

In one embodiment, an interior of the sleeve wall facing the interior is connected to the wall. As a result, for example, the sleeve can be placed on the wall.

In an alternative embodiment, an outer side of the sleeve wall, which faces away from the interior, is connected to the wall. As a result, for example, the sleeve element can be inserted into an interior space defined by the wall.

In particular, a connection between the sleeve and the wall is fluid-tight. For example, if such a connection is a reflow connection, a secure fluid connection can be easily achieved. Even by a press fit with a correspondingly high press fit, a high fluid tightness can be achieved.

For the same reason, it is favorable if a connection between the sleeve and the cable is fluid-tight. As a result, high fluid tightnesses for the housing can be realized without further additional elements.

In one embodiment, at least one sealing element, in particular in the form of an O-ring between the sleeve and a contact surface of the housing is arranged on the at least one through-hole. This makes it possible to increase the tightness of the housing at the cable gland.

Advantageously, the wall has at least one region which is oriented at an acute angle to an opening direction of the through-hole. As a result, for example, in the case of a reflow connection, an additional pressing force can be generated to increase the tightness.

In one embodiment, the at least one region is formed by a chamfer on the wall.

In an alternative embodiment, the at least one region is formed by orientation of the wall as a whole. For example, a wall is formed as an obliquely oriented sealing lip.

Accordingly, the sleeve advantageously has at least one region which is oriented at an acute angle to the opening direction of the through-hole and is adapted to the corresponding region of the wall. As a result, a connection can also be achieved, for example, by melting, and corresponding pressing forces can be generated in order to achieve high fluid tightness.

In one embodiment, the sleeve has a web element which exerts a force on the wall which presses the wall against the cable. As a result, for example, a press fit with high pressing force and thus with high density can be realized.

In particular, the at least one web element is a ring element. It runs around to achieve a high tightness.

The electrical device is for example a sensor such as a proximity sensor or distance sensor or is a switch.

An apparatus according to the invention is produced by passing the cable through the associated feedthrough recess, bringing the sleeve, which is placed on or placed on the cable, in position to the wall and fusing it to the wall and / or to the cable becomes.

The method according to the invention has the advantages already explained in connection with the electrical device according to the invention.

In particular, the connection is made by fusing by ultrasonic welding or friction welding. It can thereby be the required temperatures for the partial melting of the plastic material of the wall and / or a cable sheath. By appropriate shaping, for example, a sonotrode during ultrasonic welding, the corresponding ultrasound energy can be introduced in spatially defined regions so as to achieve a connection to precisely predetermined regions.

In particular, the sleeve is adapted to the cable formed so that after the fusing the cable is clamped to the sleeve. In particular, can be achieved by the melting an increase in the clamping force.

It is advantageous if the sleeve is placed on the cable from a housing inside. This can simplify the production; The cable is passed through the through-hole, the sleeve is placed on and then positioning the sleeve, the cable and the sleeve is brought to the wall in position to make the connection can.

The following description of preferred embodiments is used in conjunction with the drawings for further explanation of the invention. Show it:

1 a partial perspective view of a first embodiment of an electrical device according to the invention;

2 a sectional view taken along the line 2-2 according to 1 ;

3 a sectional view taken along line 3-3 according to 1 ;

4 another partial perspective view of the electrical device according to 1 ;

5 a partial perspective view of a second embodiment of an electrical device according to the invention;

6 a sectional view taken along the line 6-6 according to 5 ;

7 an enlarged view of this area A according to 6 ;

8th another perspective view of the electrical device according to 6 ;

9 a partial perspective view of a third embodiment of an electrical device according to the invention;

10 a sectional view taken along the line 10-10 according to 9 ;

11 an enlarged view of the area B according to 10 ; and

12 another partial perspective view of the electrical device according to 9 ,

A first embodiment of an electrical device according to the invention, which in a partial view in the 1 to 4 shown and there with 10 is designated comprises a housing 12 of which a part is shown in the figures. This case 12 has corresponding housing walls 14 on which a housing interior 16 limit. The housing interior 16 is through the housing walls 14 from an outdoor space 18 separated. In the case 12 is in a housing wall 20 a through-hole 22 educated. The passage recess 22 runs between the outside space 18 and the interior 16 , Through the passage recess 22 is a cable 24 guided. In the housing interior 16 are corresponding strands or wires of the cable 24 with an electronic device, which is arranged in particular on one or more boards, the electrical device 10 connected (not shown in the drawings).

At the electrical device 10 is on the housing wall 20 with the passage recess 22 in particular in one piece, the outside space 18 facing, a ring element 26 arranged. This ring element 26 has an interior 28 with a circular diameter. The passage recess 22 , which on the housing wall 20 outside the ring element 26 is formed, is also circular. It has a larger diameter than the interior 28 , The interior 28 is designed so that the cable 24 through this is feasible. Accordingly, the cable 24 spaced to a wall 30 which the Durchgangsausnehmung 22 limited.

Between this wall 30 and the ring element 26 is on the ring element 26 a contact surface 32 formed, which is in particular annular. This contact surface 32 serves, as will be described in more detail below, for supporting a sealing element 34 especially in the form of an O-ring.

On the case 12 is at the through-hole 22 and in the interior of the housing 16 projecting a wall 36 educated. The wall 36 surrounds closed and in particular annular the through-hole 22 , The wall 36 forms a neck 38 ,

In one embodiment, the wall is 36 integral with the housing wall 20 in which the passage recess 22 is formed, connected.

The wall 36 defines an interior space (implementation space) 40 through which the cable 20 is performed. This interior 40 in particular has rotationally symmetrical to an opening direction 42 the through-hole 22 formed, that is he has circular cross sections.

The wall 36 has a front end 44 , which is the housing wall 20 turned away.

At the front end 44 has the wall 36 an area 46 which is at an acute angle to the opening direction 42 lies. In this area has the interior 40 the shape of a (hollow) cone section. The wall 36 is in this area 46 chamfered.

The housing 12 with the housing wall 20 and the wall 36 is made of a plastic material, such as PBT or polyamide.

A coat of cable 24 is also made of a plastic material such as PU.

The cable 24 is a sleeve 48 assigned. This sleeve 48 is in the housing interior 16 on the cable 24 positioned.

The sleeve 48 is made of a plastic material. For example, it is made of PBT or polyamide.

It is advantageous if the jacket of the cable 24 and the sleeve 48 are made of a material of the same plastic base as thermoplastic PU but with different hardness. Furthermore, it is favorable if the wall 36 and the sleeve 48 made of the same material.

As a result, as will be explained in more detail below, an optimized fusion can be achieved.

It is as a ring element 50 formed (see in particular 4 ). It has an interior 52 on, through which the cable 24 is performed. The interior 52 is in particular (at least approximately) hollow cylindrical. A sleeve wall 54 surrounds the interior 52 and defines this.

On an outside 56 the sleeve wall 54 are tab-shaped areas 58 formed, which in one part 60 at an acute angle to the opening direction 42 are oriented. This acute angle in turn is adapted to the acute angle of the area 46 ,

In the embodiment shown are two opposite tab-shaped areas 58 intended.

Furthermore, on one end face 62 the sleeve 48 , which is the through-hole 22 facing away, web elements 64 arranged. These web elements 64 serve for connection with the cable 24 ,

Between one of the front side 62 opposite end face 66 the sleeve 48 and the contact surface 32 sits the sealing element 34 ,

The sleeve 48 is with the wall 30 connected. An outside of the sleeve wall 54 is with an inside of the wall 36 connected. The compound is made by melting; it is the plastic materials of the wall 36 and the sleeve wall 54 connected in a melting area.

A typical thickness of such a melting range is about 0.5 mm.

The connection between the wall 36 and the sleeve 48 is fluid-tight; the stub 38 the wall 36 surrounds the sleeve wall 54 complete and the connection is fluid tight.

By the melting connection between the wall 36 and the sleeve 48 , where the sleeve 48 in the neck 38 is pressed, the sleeve exercises 48 on that in the interior 52 the sleeve 48 lying cables 24 a clamping force, which is the cable 24 on the housing 12 holds.

It can also be an ultrasonic weld or Reibschweißverbindung between the sleeve 48 and the cable 24 in particular via the web elements 64 be prepared.

The electrical device 10 is made as follows:
The cable 24 is through the through-hole 22 guided. In the housing interior 16 , which is then accessible in this manufacturing process, the sleeve 48 on the wall 36 (after positioning of the sealing element 34 ), with the cable 24 through the interior 52 the sleeve 48 pushed through. The sleeve 48 gets so far into the neck 38 shifted until it with suitable axial force the sealing element 34 contacted.

Subsequently, by ultrasonic welding or friction welding for the Anschmelzverbindung between the sleeve 48 and the wall 36 or the cable 24 (a jacket of the cable 24 ) taken care of.

For example, in ultrasonic welding, a U-shaped sonotrode is used in order to obtain the corresponding ultrasound application in the melt region to be produced.

Elements of the cable 24 are connected to electronic circuit elements.

When the housing interior 16 is filled with a filling medium (such as a foam or a resin material), this is on the wall 36 and the sleeve 48 at.

In the solution according to the invention, a fluid-tight connection (feedthrough) of the cable is produced in a simple manufacturing manner 24 through the housing 12 achieved without, for example, additional screw or the like must be provided. There is a strain relief for the cable in a relatively short way 24 achieved, so that the immersion depth of the cable sheath of the housing 12 can be kept low.

The Anschmelzverbindung between the sleeve 48 and the wall 36 or the cable 24 (the cable sheath) and the sleeve 48 may take place over the entire scope or only over a subset of its scope.

A second embodiment of an electrical device according to the invention, which in the 5 to 8th is shown in a partial view and there with 68 is designated comprises a housing 70 , being on a housing wall 72 a through-hole 74 is formed, through which a cable 24 (same reference numerals are used for the same elements).

At the through-hole 24 is in particular integrally connected to the housing wall 72 a wall 76 arranged, which in a housing interior 78 protrudes. The wall 76 surrounds the passage recess closed 74 at a foot area 80 , The wall 76 defines an interior 80 through which the cable 24 is performed.

The wall 76 is formed cone-shaped section; The interior 80 has the shape of a (hollow) cone section.

The wall 76 is in cross section at an acute angle to an opening direction 82 the through-hole 72 oriented. At one end of the forehead 84 , which is the through-hole 74 is facing away, is an inner cross section of the wall 76 (a cross section of the interior 80 ) smaller than a corresponding cross section of the through-hole 74 , The wall 76 presses in the area of this front end 84 to the corresponding jacket of the cable 24 , with a corresponding pressure area around the cable 24 is circulating. The wall 76 forms a sealing lip through which the cable 24 is performed.

The cable 24 is a sleeve 86 assigned. This sleeve 86 is designed as a ring element and has a sleeve wall 88 with an inside 90 and an outside 92 on. The sleeve 86 has an area 94 which is at an acute angle to the opening direction 82 and adapted to the corresponding orientation of the wall 76 is.

The sleeve 86 is by melting in particular via ultrasonic welding or friction welding on the inside 90 with an outside of the wall 96 connected and especially in the field 94 connected. You can also by melting with a cable sheath of the cable 24 be connected.

By connecting the sleeve 86 with the wall 76 the radial clamping force is amplified, which the wall 76 against the cable sheath of the cable 24 suppressed. Furthermore, a pressing force is generated by the corresponding welding treatment, which the sleeve wall 88 against the cable 24 pushes and keeps this fluid-tight (possibly in addition to this non-positive connection, the Anschmelzverbindung between the sleeve 86 and the cable 24 in front).

The electrical device 68 is basically made the same as above based on the electrical device 10 described. Through the passage recess 24 the cable is pushed and the sleeve 86 is inside the housing interior 78 put on and then by, for example, ultrasonic welding or friction welding is for the connection of the sleeve 86 the wall 76 and optionally also for the Anschmelzverbindung between the cable 24 taken care of.

In a third embodiment of an electrical device, which in the 9 to 12 shown and there with 96 is designated, the housing is basically the same design as in the electrical device 68 , The same reference numerals are used for the same elements.

It is a sleeve 98 provided, which is an area 100 has, which is adjusted in its orientation at an acute angle to the wall 76 , At this area 100 sits a circumferential ring element 102 which is on the wall 76 presses and this against the cable 24 suppressed.

The ring element 102 has a web which generates a corresponding pressure.

The sleeve 98 also has an area 104 on, which rests against the cable (the cable sheath). This area 104 can do this on the cable 24 be positioned by a Anschmelzverbindung or be connected by a press fit with this.

The electrical device 96 in turn is made so that the cable 24 through the passage recess 74 is guided and then the sleeve 98 is put on.

If this alone by press-fitting to the cable 24 sits and accordingly the cable 24 has an excess, the sleeve becomes pressurized 98 in position over the wall 76 brought.

As mentioned above, in addition, a melting connection between the sleeve 98 and the cable 24 be provided.

LIST OF REFERENCE NUMBERS

10

 Electrical device (first embodiment)

12

 casing

14

 housing walls

16

 Housing interior

18

 outer space

20

 housing wall

22

 through recess

24

 electric wire

26

 ring element

28

 inner space

30

 wall

32

 contact surface

34

 sealing element

36

 wall

38

 Support

40

 inner space

42

 opening direction

44

 front end

46

 Area

48

 shell

50

 ring element

52

 inner space

54

 sleeve wall

56

 outside

58

 Area

60

 part

62

 front

64

 web element

66

 front

68

 Electrical device (second embodiment)

70

 casing

72

 housing wall

74

 through recess

76

 wall

78

 Housing interior

80

 inner space

82

 opening direction

84

 front end

86

 shell

88

 sleeve wall

90

 inside

92

 outside

94

 Area

96

 Electrical device (third embodiment)

98

 shell

100

 Area

102

 ring element

104

 Area

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102007004896 A1 [0003]
• US 4712296 [0004]

Claims (27)

Electrical device comprising a housing ( 12 ; 70 ), which has a housing interior ( 16 ; 78 ) defines at least one cable ( 24 ), which through a Durchgangsausnehmung ( 22 ; 74 ) in the housing ( 12 ; 70 ) from an outdoor space ( 18 ) in the housing interior ( 16 ; 78 ) is guided, wherein on the housing ( 12 ; 70 ) at the at least one through-hole ( 22 ; 74 ) a wall ( 36 ; 76 ) is arranged, which in the housing interior ( 16 ; 78 ) and an execution space ( 40 ), through which the cable ( 24 ), and a sleeve ( 48 ; 86 ; 98 ), which in the housing interior ( 16 ; 78 ), an interior space ( 52 ; 80 ), through which the cable ( 24 ) and with the cable ( 24 ) and the wall ( 36 ; 76 ) connected is. Electrical device according to claim 1, characterized in that the sleeve ( 48 ; 86 ; 98 ) is made of a plastic material. Electrical device according to claim 1 or 2, characterized in that the wall ( 30 ; 76 ) is made of a plastic material. Electrical device according to one of the preceding claims, characterized in that the sleeve ( 48 ; 86 ; 98 ) with the cable ( 24 ) and / or the wall ( 36 ; 76 ) is connected by fusion. Electrical device according to claim 4, characterized in that the sleeve ( 48 ; 86 ; 98 ) with the cable ( 24 ) and / or the wall ( 36 ; 76 ) is connected by ultrasonic welding or friction welding. Electrical device according to claim 4 or 5, characterized in that a cable sheath of the cable ( 24 ) and the sleeve ( 48 ; 86 ; 98 ) are made by the same base material. Electrical device according to one of claims 4 to 6, characterized in that the wall ( 36 ; 76 ) and the sleeve ( 48 ; 86 ; 98 ) are made of the same base material. Electrical device according to one of the preceding claims, characterized in that the cable ( 24 ) with the sleeve ( 48 ; 86 ; 98 ) is connected by clamping. Electrical device according to one of the preceding claims, characterized in that the sleeve ( 48 ; 86 ; 98 ) with the cable ( 24 ) and / or the wall ( 76 ) is at least partially connected by an interference fit. Electrical device according to one of the preceding claims, characterized in that the sleeve ( 48 ; 86 ; 98 ) as a ring element ( 50 ) is trained. Electrical device according to claim 10, characterized in that the interior ( 52 ; 80 ) through a sleeve wall ( 54 ; 88 ) is limited. Electrical device according to claim 10 or 11, characterized in that a the interior ( 80 ) facing inside ( 90 ) of the sleeve wall ( 88 ) with the wall ( 76 ) connected is. Electrical device according to claim 10 or 11, characterized in that an outside ( 56 ) of the sleeve wall ( 54 ), which the interior ( 52 ) is turned away, with the wall ( 36 ) connected is. Electrical device according to one of the preceding claims, characterized in that a connection between the sleeve ( 48 ; 86 ; 98 ) and the wall ( 36 ; 76 ) is fluid-tight. Electrical device according to one of the preceding claims, characterized in that a connection between the sleeve ( 48 ; 86 ; 98 ) and the cable ( 24 ) is fluid-tight. Electrical device according to one of the preceding claims, characterized in that a sealing element ( 36 ), in particular an O-ring, between the sleeve ( 48 ) and a contact surface ( 32 ) of the housing ( 12 ) at the at least one through-hole ( 22 ) is arranged. Electrical device according to one of the preceding claims, characterized in that the wall ( 36 ; 76 ) at least one area ( 46 ; 76 ) which is at an acute angle to an opening direction ( 42 ; 82 ) of the through-hole ( 22 ; 74 ) is oriented. Electrical device according to claim 17, characterized in that the at least one area ( 46 ) is formed by a chamfer. Electrical device according to claim 17 or 18, characterized in that the at least one area ( 46 ) by orientation of the wall ( 76 ) is formed as a whole. Electrical device according to one of claims 17 to 19, characterized in that the sleeve ( 48 ; 86 ; 98 ) at least one area ( 58 ; 94 ; 100 ), which at an acute angle to the opening direction ( 42 ; 82 ) and to the appropriate area ( 46 ; 76 ) of the wall ( 36 ; 76 ) is adjusted. Electrical device according to one of the preceding claims, characterized in that the sleeve ( 98 ) a web element ( 102 ), which has a force on the wall ( 76 ) and the wall ( 76 ) against the cable ( 24 ) presses. Electrical device according to claim 21, characterized in that the at least one web element is a ring element ( 102 ). Electrical device according to one of the preceding claims, characterized in that the electrical device is a sensor or switch. A method of manufacturing an electrical appliance according to any one of the preceding claims, wherein a cable is passed through the associated through-hole, the sleeve placed on or seated on the cable is brought into position against the wall and the sleeve is connected to the wall and / or is connected to the cable by melting. A method according to claim 24, characterized in that the connection is carried out by fusion by ultrasonic welding or friction welding. A method according to claim 24 or 25, characterized in that the sleeve is adapted to the cable is formed so that after fusing the cable is clamped in the sleeve. Method according to one of claims 24 to 26, characterized in that the sleeve is placed from a housing inside on the cable.

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