EP0513263A1

EP0513263A1 - Device carrying a wire through the wall of a housing while maintaining a leaktight seal.

Info

Publication number: EP0513263A1
Application number: EP91919742A
Authority: EP
Inventors: Helmut Laufer; Wolfgang Fehlmann; Johannes Pflug; Hans-Peter Bauer; Wolfgang Braun; Ewald Eblen; Peter Nordhaus; Peter Zweigle; Elmar Huber; Roland Gronenberg; Joerg Wolke
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH; Carl Freudenberg KG
Priority date: 1990-12-01
Filing date: 1991-11-13
Publication date: 1992-11-19
Anticipated expiration: 2011-11-13
Also published as: JP3207422B2; JPH05503393A; ES2079683T5; DE4038394A1; KR100264195B1; EP0513263B1; ES2079683T3; WO1992010011A1; US6737579B1; DE59106736D1; KR920704381A; EP0513263B2

Abstract

Il est proposé un agencement pour le passage étanche d'un conducteur à travers la paroi d'un boîtier, où le conducteur passe entre la partie de fermeture d'une ouverture de boîtier et la paroi frontale dudit boîtier.An arrangement is provided for the sealed passage of a conductor through the wall of a housing, where the conductor passes between the closing portion of a housing opening and the front wall of said housing.

Description

Arrangement for tight passage: a conductor through the wall of a housing

State of the art

The invention is based on an arrangement according to the preamble of patent claim 1.

Such an arrangement is known from DE-OS 2845 139. There electrical actuators and angle and displacement sensors are provided within a fuel-filled interior of a fuel injection pump, the connections of which lead from the fuel-filled interior to a control unit. The connections of the electrical components are guided to an opening in the wall of the housing of the fuel injection pump, the opening being closed off by a closure plate which is pressed tightly onto an annular seal mounted in the housing. The connections of the components are led through holes in this closure plate to the outside of the pins of a plug contact. The bushing is sealed and fastened by soldering or embedding in sealing compound in the holes in the intermediate plate. This arrangement is quite complex and difficult to handle in assembly. While in the prior art the electrical components are housed stationary, there is also one Difficulty when a component is accommodated in a portable manner. Rigid conductor connections leading to the connection point on the closure plate can then no longer be used. A further disadvantage is that all contact points between the electrical component and the further conductor and the conductor of the connection to the external pins are exposed to the fuel.

Advantages of the invention

The arrangement according to the invention with the characterizing features of claim 1 has the advantage that only a part of the conductor connections is arranged in the fuel-filled space and the conductor (s) are led out in the simplest way through the separation point between the housing opening and the closure part. This eliminates the need for a separate liquid-tight connection between the conductor arranged on the inside and a conductor, a plug, or a connection of an electrical device, control device or circuit part that extends outside the housing. By using the seal of the closure part, this is tightly enclosed at the point where the conductor or the conductor passes through, and at the same time the housing is also tightly sealed.

An advantageous development according to claim 2 offers an improvement in the seal, it being possible, in particular advantageously, for the sealing element or the sealing compound to be applied to the conductor according to claim 4. In a particularly advantageous manner, the embodiment according to claim 11 contributes to solving the problem of a simple, tight passage of conductors through the wall of a housing. The conductor track carrier is advantageously clamped between the closure part and the housing and is not particularly bulky at the passage point due to the design of the conductor in the form of flat copper tracks, so that a high level of sealing security against larger pressure drops between a medium within the housing and one 3 -

Medium outside the housing is guaranteed. The media can be of different types such. B. be liquid on one side and gaseous on the other side or be of the same type, the one medium being in a physical state that deviates from that of the other medium. In the case of a stable design of the conductor track carrier or with a low application of force, the conductor track carrier itself can form the closure part. In this advantageous manner, however, the conductor track carrier is an elastic carrier film, preferably polyimide, which carries the conductor tracks, which in turn can be covered by an elastic cover film. The carrier film advantageously forms a movable connection to the portable electrical components within the housing.

The carrier film can either be advantageously arranged on a carrier plate which supports the carrier film or only the carrier film can be provided if it is not exposed to great mechanical forces. To improve the sealed implementation, the carrier film can be passed through a seal according to claim 7 or sealing materials can be applied to the carrier film according to claim 4 or 5. In this case, the carrier film can be used alone without a further carrier plate. With the applied sealing compound, it represents a uniformly manageable object that is easy to assemble. The embodiment according to claim 21 from which a z. B. with sealing material provided on both sides ring, which is inserted between the closure part and the housing wall and the otherwise provided between the closure part and the housing wall replaced molded seal. A carrier film strip or tail continues inwards into the interior of the pump for flexible contacting with a portable electrical component, and outwards the carrier film continues with an extension for contacting with other electrical components, such as. B. an electrical control unit. In the area of sealing between The closure part and housing are inserted with the coated carrier film, a component of the same thickness, which ensures optimal seals.

The refinements according to the invention are used particularly advantageously in fuel injection pumps. However, there are also many other possible uses, wherever it comes down to the simple and easy-to-assemble removal of conductors from sealed housings.

drawing

Eleven exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the description below. 1 shows a section through a distributor fuel injection pump, in which the arrangement according to the invention can be used, FIG. 2 shows a partial section through the fuel injection pump according to FIG. 1, with a first exemplary embodiment of the invention, FIG. 3 shows a section through the Section of Figure 2 along line III-III, Figure 4 shows a second embodiment of the invention with vulcanized on both sides of a carrier film vulcanized rubber seal, which continues as a rubber seal takes the form of the sealing surface between the closure plate and housing opening, Figure 5 shows a section through a third embodiment with flexible conductor film and sealing plate as a closure part of the housing in a first embodiment and FIG. 6 in a second embodiment with contacting deviating from FIG. 5, FIGS. 7a to 7g are the basic illustration of a fourth to ninth embodiment of the invention, FIGS. 8 and 9 are two further embodiments. guide examples with an elastic seal into which individual conductors are vulcanized. Description of the embodiments

FIG. 1 shows a fuel injection pump of the distributor type for diesel internal combustion engines. A drive shaft 11 is mounted in the housing 10 and is coupled to a lifting disk 12 arranged transversely to the axis of the drive shaft. This is held by a spring 18 on rollers 16, on which it runs when the drive shaft rotates and, in addition to the rotary movement, also executes a reciprocating movement. The rollers 16 are held in a roller ring 17 which is supported in the housing and which can additionally be rotated in the housing by a spray adjuster 33, but is held essentially stationary. A pump piston 21 is connected to the lifting disk 12 and, coupled with the direction of rotation with the lifting disk, executes a corresponding rotating and lifting movement. The pump piston slides tightly in a cylinder bore 20 and there encloses a pump working space 23 on the front side. This is connected via a fuel channel 27 to the pump chamber interior, the suction chamber 28, as long as a solenoid valve 22, not shown, controlled by a control unit 38, keeps the channel 27 open. The opening of the channel takes place during the suction stroke of the pump piston to fill the pump work space and in part of the pump piston delivery stroke to determine the fuel injection quantity and the injection time. The fuel displaced from the pump working chamber 23 by the pump piston 21 reaches a respective injection line 32 via a longitudinal channel 25 in the pump piston and a distributor groove 31 connected to it, which is connected via a pressure valve 40 to a fuel injection valve (not shown further). The injection lines 32 are distributed around the circumference of the cylinder bore 20 in accordance with the number of injection valves to be supplied per pump piston rotation, so that a different fuel injection line is supplied with fuel brought to high pressure for each pump piston delivery stroke. The pump interior is filled with fuel by a fuel feed pump 29 and kept at a pressure which is preferably dependent on the speed. Corresponding This speed-dependent pressure is used to adjust the roller ring 17, with which the angle of rotation is changed, with which the stroke of the cam disk 12 begins.

To control the solenoid valve 22, the control device 38 requires information about the relative position of the roller ring or about the start of the delivery stroke of the pump piston. For this purpose, on the one hand, a segment disk 34 is applied to the drive shaft 11, which rotates synchronously with the drive shaft, and on the other hand an angle sensor 37 is arranged on the roller ring 17 opposite the end face of the segment disk, which forms control signals corresponding to the segments passing it it passes on to the control device 38 via a connecting line 41. As can also be seen from the drawing, this sensor is arranged in the fuel-filled room.

FIG. 2 now shows a section through the adjoining, uncut housing part of the fuel injection pump according to FIG. 1. The angle sensor 37, which sits in the roller ring 17 and projects radially outward through an opening 42 into an adjacent space 43, can be seen there again. This space is separated from a neighboring space 45 by a side wall 44, which is under atmospheric air pressure and receives the circuit part 46 of the control device 38. A neighboring room 49 partitioned off by another side wall 48 of the room 43 can be fuel-filled, although this fuel can be under a different pressure than that in the room 43.

Figure 3 shows a section through Figure 2 along the line III-III. Both figures also show an intermediate plate 51 which comes to rest on the end faces 53 of the side walls 44 and 48 forming an opening 47 of the room 43 and on the other boundary walls of the rooms 45 and 49. Connected to each other in these end faces 53 are grooves 54, into which a molded seal 56 is inserted, which is the seal between the intermediate plate 51 and the end faces 53 serves. On the other side of the intermediate plate 51, a housing cover 58 comes into contact, which serves as a closure part of the injection pump housing and has corresponding end faces 60 opposite the end faces 53 of the side walls and housing walls. These end faces are also recessed 61, in which a molded seal 63 is located and the intermediate plate 51 seals from the other side.

The intermediate plate can have passages between the pump-side and the closure part-side part of the spaces 45, 43 and 49. These connection cross sections are not shown here. A conductor foil 65 is laminated onto the intermediate plate on the side of the injection pump housing 10. This film is a carrier film 64 made of polyimide, on which conductor tracks made of copper are applied, which are preferably in turn closed by a cover film, which in turn can also consist of polyimide, and are electrically insulated against contact with the housing part . The conductor film or carrier film is known under the trade name "Kapton" film. This conductor foil or carrier foil of conductor tracks extends over the entire intermediate plate closing spaces 43, 45 and 49. In space 43 leads from the foil from a foil tail 66, the z. B. can be formed by cutting free from the remaining film material and has not been laminated onto the intermediate plate. As the section in FIG. 3 shows, the film tail is bent over and contacted and fastened to the angle sensor 37 with the conductor tracks on it. The conductor foil 65 is very flexible and, due to these properties, the angle sensor can move from the solid position into the dashed position without hindrance and without impairing the electrical connection.

The connection between the angle sensor 37 and the conductors takes place in the fuel-filled space and the conductors from this fuel-filled space into the air-filled space 45 on the tight Carrier film guided through the housing joint between the end faces 60 and 53. In the air-filled space 45, the conductor tracks of the carrier film are contacted or soldered with plug-in sleeves 68 and with these in turn the connections 69 to the switching point 46, which is arranged in this air-filled space. The fact that the head between z. B. angle sensor and control unit are designed in the form of conductor tracks, these have a very small passage cross-section in height. This allows the connections to be made very easily and tightly through the housing wall 44 to the outside into the air-filled space 45. The molded seals 56, 63 lie flush against the conductor foil 65 and seal the space 43 tightly. The conductor film is supported by the intermediate plate 51, which in turn forms support points for the receptacles 68 in the outer region. This results in a very easy-to-assemble arrangement with good flexibility in the connection between the portable angle encoder part and the tight conductor leadthrough to the outside.

Instead of the embodiment according to FIGS. 2 and 3 with an intermediate plate 51, the arrangement can also be designed in such a way that, according to FIG. 4, a molded seal 157 is used which has the shape of the end face 53 bordering the fuel-carrying space 43 and now between the flat end faces 53 and 60 is placed or recesses fixing their position in the molded seal. This molded seal 157 consists of an annular base body made of carrier film in the same shape as that of the end face profile, and sealing material is applied to both sides of this carrier film. For stabilization, this base body has a transverse web 71, from which the conductor foil tail 166 with the conductor paths 70 leads within the enclosure of the part of the carrier foil 165 which carries the molded seal 157. A second carrier foil tail 72 carrying the conductor tracks leads to the outside to contacting points 73, at which, for. B. the connection with the receptacles 68. At the end of the conductive foil tail 166, contact is made with the Angle sensor 37. In the installed state, the carrier film tail 166 projecting beyond the molded seal 157 is bent inwards, in the manner shown in FIG. 3, and thus remains in the area of the cross-sectional area of the fuel-filled space 43 characterized by the top view of the molded seal 157 Instead of as described, however, the carrier film can also consist only of a transverse web 71 with the two conductor film tails 166 and 72. In this case, the molded seal 157 is ulcanized onto the ends of the crosspiece and continues outward to the conductor foil tail 72, as can be seen from the section IV-IV. This configuration offers a very easy to handle arrangement. The connecting lines of the electrical components in the fuel-filled space can now be assembled as a single object together with the molded seal that seals the fuel-filled space. This is made possible in particular by the use of carrier film with conductor tracks, which allow very little bulk between the housing wall and cover. The sealing material can be glued to the conductor foil, ulcanized or sprayed on, depending on the materials used. In the limit case where the pressure differences are not too high and between the two spaces to be connected, the conductor foil can also be used as a seal without coating with sealing material. Above all, the first-mentioned version is advantageous here, in which the carrier film covers the entire end face of the housing wall. This means that there are no large differences in thickness between the conductor feedthrough point and the other areas. There is also the possibility that the conductor track designed in this way is glued onto the end face of the housing wall.

A modification of the exemplary embodiments shown results from the fact that instead of the housing cover 58 shown in FIGS. 2 and 3, a closure part 158 in the form of an end plate is used, which now only closes the space 43 on the housing side. This end plate then takes over the function of the intermediate plate 51 in with respect to the support of the carrier film. In FIG. 5, part of the housing wall 44 is shown in partial section with a groove 55 on the end face and molded seal 56. The film tail shown merges into the conductive foil 65 which is led out between the cover plate and molded seal 56, which is folded over and glued to the back of the cover plate is. At this point, the conductor tracks on the carrier film can be soldered or welded to pins 75.

FIG. 6 shows a corresponding embodiment, only that contact is made there with the conductor tracks on the carrier film via contact springs 76. The contact springs 76 are connected to the printed circuit board of the control device or to a housing part of the control device or to a further part.

FIG. 7 shows various, in some cases already mentioned, options for conducting the conductor between the housing 10 and the closure part 58. FIG. 7 a shows how the carrier film with the conductor tracks is placed flat between the flat faces 53 and 60 without additional measures. If the pressure difference between the interior, e.g. B. fuel-filled space 43, and outside space, for. B. air-filled outer space 45, the inherent elasticity of the conductor track is sufficient to ensure tightness here. If the media are the same, this solution is particularly recommended.

FIG. 7b shows the additional use of a seal, preferably a molded seal inserted according to FIGS. 2, 5 or 6 in the front recesses of the housing, but with a simple, unsupported carrier film at the passage point. To particularly increase the tightness, the carrier film is enclosed on both sides according to FIG. 7c by seals which are inserted as molded seals in the corresponding end faces of the housing and the closure part. According to FIGS. 7d to f, it is also possible to apply sealing compound on one side either to the end face of the closure part to apply the front of the housing or on the conductor foil. Best results with somewhat more effort can be expected from the solution according to FIG. 7g, which corresponds to the solution mentioned in FIG. 4, with sealing compound applied to the carrier film on both sides. This solution can also be used when using an intermediate plate or support plate, in that on the one hand the intermediate plate and on the other hand the conductor foil applied pressure-tight to the other side of the intermediate plate is provided with sealing material.

Thanks to the conductive foil and intermediate plate according to FIGS. 2 and 3, it is also possible to use a combination of printed circuit board and conductive foil. In this case, the circuit board takes over the function of the intermediate plate 51 together with the conductor foil leading to the outside. In this case, a film tail is contacted with the circuit board in the area of the fuel-filled space 53. This film tail is used for flexible connection between z. B. a portable sensor, such as the sensor 37 of Figure 3 and the further conductor tracks on the circuit board. The circuit board is sealed in the area of the bushing between the housing and the closure part in an analogous manner to that described in the above exemplary embodiments. This solution also has the advantage that there is an almost uniformly thick intermediate plate between the two halves, the housing and the closure part and thus a good precondition for a secure sealing of the fuel-filled space 43 to the outside is ensured. Another embodiment is shown in FIG. There is shown part of a molded seal 77 which, in the manner of molded seal 56 from FIG. 2, is inserted into a recess 54 which is incorporated into one of the end faces 53 or 60. The molded seal projects beyond the end face, so that it can preferably also be immersed in a second recess which is arranged on the opposite end face. In a simple manner, however, this end face will be kept flat. Conductors 78 are now vulcanized into the seal transversely to the longitudinal direction thereof, which thus leads through the joint between the housing and the closure part are passed. In order to support the seal while keeping the seal thickness as small as possible, grooves 79 extending from the recess and extending transversely in the direction of the conductors branch off from the recess.

However, according to FIG. 9, the molded seal in the area of all the conductors lying next to one another, which are to be passed between the housing and the closure part, may have a widening 80 which receives them through a corresponding recess branching from the recess 54.

The exemplary embodiments shown are not only limited to use in the application example shown for a fuel injection pump, but can also be used in a wide variety of other applications, whenever it is a matter of carrying out conductors from interior spaces into other spaces without problems Light mounting bar, especially for large series assembly. Flexible guidance of the conductors over the carrier film tail shown is possible. The carrier films can also be provided in any shape in a simple manner in order to cover even complicated applications or housing openings.

Claims

Expectations

1. Arrangement for the tight passage of at least one conductor (70) through the wall of a housing (10), which includes a first medium, into an area which has a second medium and can be closed with a closure part (58, 158) Housing opening with a seal (56, 157, 165) arranged between the closure part and the housing wall surrounding the housing opening, to which the closure part is held by a closing force, characterized in that the conductor (70) between the closure part (58, 158) and the housing wall is carried out and at the latest in the closed position of the closure part in tight contact with the seal.

2. Arrangement according to claim 1, characterized in that between the housing wall (10) and the closure part (58, 158) two seals (56, 63) are arranged and the conductor (70) is carried out between these seals (Fig. 7c).

3. Arrangement according to one of the preceding claims, characterized gekenn¬ characterized in that the seal is a molded seal which can be inserted in Aus¬ recesses of the adjacent sides of the housing wall or closure part (Figures 2, 3, 5, 6, 7b, 7c) .

4. Arrangement according to one of claims 1 or 2, characterized gekenn¬ characterized in that the seal is a sealing compound which is applied to at least one of the adjacent parts, housing (10), conductor (70) or closure part (58, 158) (Figures 7a - 7g).

5. Arrangement according to one of the preceding claims, characterized in that the at least one seal with at least one of the parts, housing (10), conductor (70) or closure part (58, 158) is tightly and adhesively connected.

6. Arrangement according to claim 5, characterized in that the connection with the sealing material is carried out by a chemical and / or thermal / physical process, in particular by spraying, vulcanizing or gluing.

7. Arrangement according to one of the preceding claims 1 to 3, characterized in that the conductor through a single, arranged between the housing wall and the closure part, in at least on one of the adjacent sides of the housing wall or closure part arranged recess (54) inserted molded seal (77) is passed through and is tightly enclosed by the latter.

8. Arrangement according to claim 7, characterized in that the seal is pressure-tightly connected to the conductor by a chemical and / or thermal / physical process, in particular by spraying, vulcanizing or gluing.

9. Arrangement according to claim 7 or 8, characterized in that in the direction of passage of the conductor from the recess (54) also leads a recess leading the conductor (79).

10. The arrangement according to claim 9, characterized in that the molded seal (80) extends into the additional recess.

11. Arrangement according to one of the preceding claims, characterized in that the conductor is formed as a unit from a pressure-tightly connected to a conductor track carrier, outwardly insulated conductor track (70).

12. The arrangement according to claim 11, characterized in that the conductor track carrier forms the closure part (158).

13. The arrangement according to claim 11, characterized in that the conductor track carrier (65) with the conductor track (70) is passed between the housing and the closure part.

14. Arrangement according to claims 11 to 13, characterized in that the conductor track carrier is a flexurally rigid carrier (51) and is connected at least in the interior (43) of the housing to a flexible, in particular elastic carrier film which serves as a further carrier of a conductor track and which Conductor is connected and contacted with the end of the carrier film, in particular a portable electrical component.

15. The arrangement according to claim 14, characterized in that the carrier film consists of polyimide.

16. The arrangement according to claim 13, characterized in that the conductor track carrier consists of a flexible, in particular elastic carrier film carrying the conductor track and the conductor track (70) is in particular insulated, preferably by a cover film, and with the end of the carrier film with a particular portable electrical component (37) is connected and contacted.

17. The arrangement according to claim 16, characterized in that the carrier film consists of polyimide.

18. Arrangement according to claim 16 or 17, characterized in that the carrier film rests on a carrier plate, is preferably connected to this pressure-tight.

19. The arrangement according to claim 18, characterized in that the carrier plate (158) forms the closure part.

20. Arrangement according to one of the preceding claims 11, 13, 16 or 17, characterized in that the carrier film covers the housing opening.

21. Arrangement according to one of claims 11 to 13, 16 or 17, characterized in that the carrier film has a circumferential in the contact area of the closure part to the housing wall, in particular on both sides connected with a seal, one of which carries the conductor track (70) extension (166, 72) leads to the inside of the housing and to the outside.

22. Arrangement according to one of claims 11 to 13, characterized gekenn¬ characterized in that the carrier film has at least one at its end of a molded seal (157) enclosed web (71), of which a carrier foil tail leading through the seal to the outside provided with conductor tracks (72) and a carrier foil tail (166) leading into the interior of the housing.

23. The arrangement according to claim 1, characterized in that the conductor is formed as a unit from a pressure-resistant with a conductor carrier, consisting of a flexible, in particular elastic carrier film, preferably made of polyimide, connected to the outside insulated conductor track and the carrier film Has the form of a ring (165) running in the contact area of the fastener on the housing wall, from each of which a carrier foil tail (166, 72) carrying the conductor track leads away to the inside of the housing and to the outside.

24. Arrangement according to claim 18, 19 or 21, characterized in that the carrier film is connected to the conductor tracks after passing through the housing wall with the back of the carrier plate and there the conductor track is contacted with connections.

25. The arrangement according to claim 24, characterized in that the contacting is carried out by soldering or welding.

26. The arrangement according to claim 24, characterized in that the contact is made by pressing a contact spring onto the end of the conductor track.

27. Arrangement according to one of the preceding claims, characterized gekenn¬ characterized in that the housing is the housing of a fuel injection pump and inside is filled with pressurized fuel and the wall of the housing separates this from a housing part in which there is atmospheric air pressure and electronic circuit (46) is arranged, which is contacted there with the end of the conductor.