DE202019100073U1 - Umbrella socket for a shield of a high-voltage line and setting tool - Google Patents

Abstract

An umbrella socket (100) for a plug connection between a screen of a high-voltage line and a ground-carrying housing (510), wherein the screen bushing (100) is made of a metal material and substantially hollow cylindrical, wherein
an axial plug contour (104) for inserting a screen plug of the high-voltage line connected to the screen is arranged on at least one partial area of an inner side of the screen bushing (100);
a self-tapping spiral structure (106) for cutting into a wall surface of an unprocessed aperture (506) of the housing (510) is disposed on at least a portion of an outside of the screen bushing (100); and
a drive geometry (108) for transmitting a torque (204) from a setting tool (500) is disposed at an end portion of the shield bushing (100).

Description

Technical area

The present invention relates to a shielding bush for a plug connection between a screen of a high-voltage line and a ground-carrying housing, as well as a corresponding setting tool.

State of the art

A high-voltage cable can be shielded. To be effective, the shield needs a ground contact. The ground contact can be made via a shield socket. The shielding bush provides an electrically conductive connection between a grounded housing and the screen. The high-voltage line runs insulated inside the shielding bushing in the housing.

For the electrical contact between the shielding bush and the housing, the shielding bush is pressed axially into an opening in the housing. The aperture is previously machined to precisely set a size of the aperture, to create a smooth surface, and to remove oxides from the surface.

In order to avoid jamming during pressing, the shield bush is aligned coaxially with the breakthrough prior to pressing with high accuracy and moved exactly in the axial direction during pressing.

Description of the invention

An object of the invention is therefore to provide a screen bushing for a plug connection between a screen of a high-voltage line and a ground-carrying housing, and a corresponding setting tool using structurally simplest possible means.

The object is solved by the subject matters of the independent claims. Advantageous developments of the invention are specified in the dependent claims, the description and the accompanying figures.

It is presented a shield bushing for a connector between a shield of a high-voltage line and a ground-carrying housing, wherein the shield bushing is made of a metal material and substantially hollow cylindrical, wherein
an axial plug contour for inserting a shield plug connected to the shield of the high-voltage line is arranged on at least a portion of an inner side of the shield bushing;
a self-tapping spiral structure is arranged for cutting into a wall surface of an unprocessed opening of the housing on at least a portion of an outer side of the screen bushing; and
a drive geometry for transmitting a torque from a setting tool is disposed at an end portion of the shield bushing.

Under a screen can be understood to be an electrically conductive sheath around at least one electrical line or a cable. The screen may for example be a tubular metal mesh. The shield shields electromagnetic couplings in or out of the line. The shield needs a ground contact. The ground contact is made to an electrically conductive, ground-leading or grounded component. The component is here a housing for a component of a high-voltage system of a vehicle. For example, the housing may be a battery housing or a switch box of the high-voltage system. The contact is made via a plug connection through a shield connector and the shield socket. The shielding bush has an axially continuous channel for the line including insulation. Through the shielding bush and the matching shield connector on the line results in a pluggable connection. The shield connector slides when plugged into the plug contour.

The shielding bushing is screwed into an unprocessed hole in a wall of the housing by rotation about a longitudinal axis of the shielding bushing. The spiral structure is raised above an outer surface of the screen bushing. The spiral structure can be sharp-edged and cut or dig when screwed into a side surface of the hole. The spiral structure may have cutting edges to cut chips from the side surface. By cutting, digging or furrows any oxide layer on the side surface is at least partially broken and made an electrically conductive contact between the shield bushing and the housing. In addition, when screwing in the spiral structure can be deformed. For example, by an elastic deformation of the spiral structure, a contact force between the shield bushing and the housing can be generated.

The drive geometry can enable a positive connection between the setting tool and the shielding bushing. The torque required to screw in the shielding bushing can be transmitted via the positive locking.

The drive geometry can be designed as a screw head drive. One Screw head drive can be rotated using a suitable tool. Screw head drives can have different shapes and sizes or key widths. For example, the size of the screw head drive can be adapted to an inner diameter of the screen bushing. Then a so-called bit can be used to screw the shielding socket into the housing. Likewise, the wrench size can be adapted to an outer diameter of the shielding socket. then a so-called nut can be used to screw the shielding bushing into the housing.

The drive geometry can be designed as a polygon, in particular as a hexagon. By a polygon or hexagon, a ring shape of the end of the shield bushing can be approximated well. Matching setting tools are widely used.

The drive geometry can be designed as an annular tooth profile. The tooth profile may have at least two teeth. A tooth profile can take up a small space and still transmit a high torque. The teeth of the tooth profile can be uniformly distributed annularly around the end portion of the shield bushing. The more teeth the tooth profile has, the smaller the individual teeth can be made with the same torque.

The tooth profile may have asymmetric saw teeth. Asymmetrical saw teeth can be pointed and have two flanks. The two flanks of a tooth can be oriented differently obliquely. For example, one of the flanks can be aligned approximately in the axial direction of the screen bushing. As a result, the flank is oriented approximately perpendicular to a compressive force oriented in the screwing-in direction. The approximately perpendicular to the pressure force-oriented edge generated during rotation in the screwing approximately no transverse to the pressure force aligned ejection force. The second flank can be very flat. Essentially no torque can be transmitted against the screwing-in direction via the second flank. The setting tool can slide against the screwing over the second edge.

The shield bushing may have a depth stop surface protruding radially over a base surface of the spiral structure. The depth stop surface can be aligned transversely to the base. The depth stop surface may be arranged on a projecting over the base flange of the shield bushing. Due to the depth stop surface, a screw-in depth of the shield bushing can be limited. If the shielding bush is properly bolted in the housing, the depth stop surface rests on an outer side of the housing next to the opening. Over one of the depth stop surface oppositely oriented pressure surface of the collar can be exerted when screwing the shielding bushing by the setting tool, an axial compressive force on the shield bushing.

The spiral structure may be formed as a plurality of partially helical guide webs. The guide webs can have a very large slope. A guide bar can be raised. The guide bar can represent a portion of a spiral or helix. The guide webs may be distributed over a circumference of the outer surface of the shield bushing. By steep guide webs, a rotation angle of the shield bushing can be limited in the breakthrough and screwing be accelerated. The guide webs can be designed, for example, sharp-edged. An end facing away from the drive geometry of the guide webs can be made tapered to facilitate the beginning of screwing. The guide webs may have notches to furrow deeper furrows in the housing.

The spiral structure may be formed as a plurality of self-tapping threads. Threads can rotate more than one turn around the outside. The pitch of the threads can be low. A thread can in the axial direction substantially adjacent to the next thread. The threads may have a lower height on the end remote from the drive geometry than on the end facing the drive geometry. As a result, the threads may have an increasing outer diameter and compensate, for example, by an insertion depth before screwing tolerances of the unprocessed housing.

Furthermore, a setting tool for a shielding bush according to the approach presented here is presented, wherein the setting tool has a centering contour for centering the shielding bushing and a counterpart to the drive geometry of the shielding bushing. A centering contour can define a radial position of the screen socket, thus preventing lateral migration of the screen socket. The centering contour may have substantially tangential stop surfaces over which the screen bushing is centered.

The centering contour may have a receptacle for a centering mandrel for centering the setting tool on the opening of the housing. A centering pin can be inserted into the opening and lead the setting tool with the shield sleeve axially to the breakthrough. Through a centering pin The shielding sleeve can be manually attached, aligned and screwed.

list of figures

• 1 bis 4 Darstellungen von Schirmbuchsen gemäß Ausführungsbeispielen; und
• 5 eine Darstellung eines Setzwerkzeugs gemäß einem Ausführungsbeispiel.

Hereinafter, an advantageous embodiment of the invention will be explained with reference to the accompanying figures. Show it:

• 1 to 4 Illustrations of shield bushings according to embodiments; and
• 5 an illustration of a setting tool according to an embodiment.

The figures are merely schematic representations and serve only to illustrate the invention. Identical or equivalent elements are consistently provided with the same reference numerals.

Detailed description

For ease of understanding, reference numerals will be used in the following description 1-3 retained as a reference.

1 shows a representation of a screen socket 100 according to an embodiment. The shielding bush has a substantially hollow-cylindrical basic body and is made of an electrically conductive material, in particular a metal material. The screen socket 100 has an axially disposed to the main body through channel 102 on. A wall of the canal 102 is an inside of the body and has a plug contour 104 for inserting a shield connector. Together form the screen socket 100 and the shield connector mating counterparts of a connector for electrically conductive connection of a screen of a high voltage electrical line to a housing. The screen bushing is screwed into a breakthrough of the housing, while the shield connector is placed at the loose end of the screen.

On at least a portion of an outside of the body is a spiral structure 106 arranged. The spiral structure 106 is designed to furrow or cut a corresponding spiral structure into a wall surface of the opening. The wall surface can be unprocessed.

At one end of the body is a drive geometry 108 arranged. About the drive geometry 108 can be a torque for screwing in the spiral structure 106 from a setting tool to the screen socket 100 be transmitted.

In one embodiment, the screen jack 100 at the end area with the drive geometry 108 a covenant 110 on. The Bund 110 carries a depth stop surface 112 which is oriented substantially perpendicular to the outside of the body. The Bund 110 thus has a larger outer diameter than the main body. The depth stop surface 112 is circular. On one of the depth stop surface 112 opposite side of the waistband 110 is the drive geometry 108 arranged.

In one embodiment, the spiral structure is 106 designed as a self-tapping or self-tapping thread.

In one embodiment, the drive geometry is designed as n-Kant. In particular, the drive geometry 108 executed as a hexagon. This can be the screen jack 100 be set with a standard setting tool with a suitable wrench size or nut size.

2 shows a representation of a screen socket 100 according to an embodiment. Essentially, the screen socket corresponds 100 the representation in 1 , Here is the screen socket 100 running fretless and the drive geometry 108 is as a tooth profile 200 educated. The tooth profile 200 has two asymmetrical saw teeth 202 each with a steep flank and a flat flank. Over the steep flank can be very effective torque 204 for screwing in the spiral structure 106 be initiated.

3 shows a representation of a screen socket 100 according to an embodiment. The screen socket 100 is essentially the same as in 2 , In contrast, the tooth profile 200 here six saw teeth 202 on.

4 shows a representation of a screen socket 100 according to an embodiment. The screen socket 100 is essentially the same as in 1 , Here is the spiral structure 108 a plurality of part-helical guide webs 400 on. The guide bars 400 show a great slope. This is how the screen socket can be 100 be screwed into the breakthrough in less than a turn. The guide bars 400 are executed in the beginning tapering. Through the tip material of the side wall of the opening can be displaced laterally at the furrow, resulting in no loose chips, which would have to be removed after setting the shielding bushing.

5 a representation of a setting tool 500 according to an embodiment. In the setting tool 500 is a screen socket 100 according to the used here approach. The screen socket 100 is in a centering contour 502 of the setting tool 500 centered. A counterpart 504 to the drive contour 108 has a positive connection to the drive contour 108 on. Torque for screwing in the screen bushing can be achieved at least in the screwing direction due to the form fit 100 from the counterpart 504 on the drive contour 108 be transmitted.

The setting tool 500 and the screen socket 100 here are essentially coaxial with an unprocessed breakthrough 506 through a wall 508 a mass-leading housing 510 arranged. The housing 510 Here is, for example, a die-cast housing, which is why the breakthrough 506 here Aushebeschrägen 512 or Entformschrägen has. Additionally, the case also points inside the breakthrough 506 a casting surface 514 with any impurities and oxides.

Before pressing a conventional shielding bushing would be a machining of the breakthrough 506 required to the casting surface 514 as well as the Aushebeschrägen 512 to remove and maintain a constant diameter of the breakthrough 506 according to a desired interference fit between the shield bushing and the wall 508 to edit.

In the approach presented here, the screen socket 100 directly into the unprocessed breakthrough 506 be used. The self-winding spiral structure 106 penetrates the casting surface when screwing in 514 as well as the Aushebeschrägen 512 , The metal material of the housing 510 gets into interspaces of the spiral structure 106 repressed.

In one embodiment, the setting tool 500 a recording 516 for a centering mandrel 518 on. The centering pin 518 hurries the screen socket 100 ahead and centered in breakthrough 506 , When bringing the setting tool 500 to the breakthrough 506 can the centering pin 518 telescopic into the receptacle 516 retract. Alternatively, the centering mandrel 518 remain extended and pushed into a housing interior. The centering pin allows the setting tool 500 not tilted to the housing 510 be set. Setting the screen socket 100 can through the centering pin 518 be accelerated.

In one embodiment, the centering mandrel 518 a pull piece 520 on. The Zugstück 520 is on an inside of the wall 580 arranged and wider than the breakthrough 506 , The centering pin 518 is here from the inside of the case through the opening 506 in the recording 516 been stuck. In the recording 516 a pulling mechanism is arranged, which is the centering pin 518 in the recording 516 moves in. The pulling mechanism will set the shielding bushing 100 generates supporting traction. In addition, over the Zugstück 520 the torque for screwing in the screen socket 100 on the case 510 be supported.

In other words, an umbrella bushing for the tensionless production of a shield connection by means of torque is presented.

On high-voltage batteries, power cables are connected to the battery using high-voltage plug-in systems. Due to the strong emission of the cables, they can be shielded to prevent disturbances inside the vehicle. The plug-in system between the battery and the line therefore requires a screen transition to vehicle ground in order to prevent stray emissions in the plug area. This can be done by means of an annular bushing (screen bushing or header screen), which contacts the cable shield with the vehicle ground or with parts connected to the vehicle ground and thus produces a defined contact resistance.

So far, this bushing has been pressed into the mass-carrying component by means of a pressing operation in a correspondingly machined fit. In the approach presented here accounts for this pressing process and the required mechanical processing on the mass-leading component.

The bushing is designed in such a way that the bushing surface passing into contact with the mass-carrying component has a self-tapping contour (threads, grooves, guide webs, etc.) and is inserted into the mass-carrying component by applying torque to the bushing. As a result, the mass-leading component can be used directly falling tool.

Under tool falling can be understood that the component can be used directly after a primary molding process, such as casting or directly following a forming process, such as stamping without machining subsequent machining, so as the component falls from the tool for mass production or is removed.

So far screen bushings are used with a smooth outer surface, which are introduced by an axial pressing operation in the post-processed mass-leading component.

By the approach presented here can be dispensed with during the pressing process on the necessary for the pressing process preceding mechanical processing of the mass-leading component and the necessary axial guidance of the shield bushing. The chip formation during the pressing process is eliminated.

The axial compression can be replaced by the use of the plug-in system presented here in HV batteries and switch boxes. This results in a direct cost savings. Due to the elimination of mechanical processing, depending on the design, an estimated 2-5 € processing costs per header can be saved. The installation of the header in tool-falling parts is made possible.

This results in a reduction of the logistics and handling effort through the use of tool-falling parts. The insertion of the shield bushes can be done with standard tools, which apply torque (eg, hand-held screwdriver, etc.). The technical cleanliness is improved by the elimination of chip formation. In addition, risks are reduced and cleaning costs reduced.

The bushing has a torque-receiving contour, a contour limiting the screw-in depth, a surface for the self-tapping elements and a surface for demonstration by the tool.

During assembly, the self-tapping elements interact with the grounding component such that the self-tiling contours reshape the surface of the mass-conducting component thereby breaking up any existing oxide layers thereby ensuring a defined screen transition. Advantageous embodiments of the torque-receiving contour are hexagonal heads or two to multi-tooth profiles. Advantageous embodiments of the self-tapping elements are self-tapping threads or guide webs.

When setting the shielding bush is inserted into a drill head so that this fixed the shielding bushing. The torque-transmitting contour on the drill head is a counterpart to the torque-receiving contour and allows torque transmission. The drill head can be used with standard screwdrivers. The setting can be assisted by a centering mandrel which dips into the drill head from below.

Since the devices described in detail above are embodiments, they can be modified in the usual way by those skilled in the art to a large extent without departing from the scope of the invention. In particular, the mechanical arrangements and the size ratios of the individual elements are selected by way of example only.

LIST OF REFERENCE NUMBERS

100

screen jack

102

channel

104

male profile

106

spiral structure

108

drive geometry

110

Federation

112

Depth stop surface

200

tooth profile

202

sawtooth

204

torque

400

guide web

500

setting tool

502

centering contour

504

counterpart

506

breakthrough

508

wall

510

casing

512

Aushebeschräge

514

casting surface

516

admission

518

centering

520

pull piece

Claims (10)

An umbrella socket (100) for a plug connection between a screen of a high-voltage line and a ground-carrying housing (510), wherein the screen bushing (100) is made of a metal material and substantially hollow cylindrical, wherein an axial plug contour (104) for inserting a screen plug of the high-voltage line connected to the screen is arranged on at least one partial area of an inner side of the screen bushing (100); a self-tapping spiral structure (106) for cutting into a wall surface of an unprocessed aperture (506) of the housing (510) is disposed on at least a portion of an outside of the screen bushing (100); and a drive geometry (108) for transmitting a torque (204) from a setting tool (500) is disposed at an end portion of the shield bushing (100). Screen bushing (100) according to Claim 1 , in which the drive geometry (108) is designed as a screw head drive. Umbrella bush (100) according to one of the preceding claims, wherein the drive geometry (108) is formed as a polygon, in particular as a hexagon. Screen bushing (100) according to Claim 1 in which the drive geometry (108) is designed as an annular tooth profile (200). Screen bushing (100) according to Claim 4 in that the tooth profile (200) has asymmetrical saw teeth (202). Umbrella bush (100) according to one of the preceding claims, with a radially over a base surface of the spiral structure (106) projecting depth stop surface (112). Umbrella bushing (100) according to one of the preceding claims, in which the spiral structure (106) is formed as a plurality of partially helical guide webs (400). An umbrella bush (100) according to any one of the preceding claims, wherein the spiral structure (106) is formed as a plurality of self-tapping threads. Setting tool (500) for a screen bushing (100) according to one of Claims 1 to 8th wherein the setting tool (500) has a centering contour (502) for centering the screen bushing (100) and a counterpart (504) to a drive geometry (108) of the screen bushing (100). Setting tool (500) according to Claim 9 in that the centering contour (502) has a centering pin receptacle (516) for centering the setting tool (500) on the opening (506) of the housing (510).

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