DE102007033647A1 - Sliding bearing for use in motor vehicle, has bearing bush partially and slidably enclosing bearing bolt, where bush has electrically conductive contact spring guide, which connects bearing bolt with bearing bush in low-impedance manner - Google Patents

Abstract

The bearing (1) has a bearing bush (5) i.e. single-piece element, partially and slidably enclosing a bearing bolt (4) using a cylindrical section (7) of the bush. The bearing bush comprises an electrically conductive contact spring guide (6), which connects the bearing bolt with the bearing bush in low-impedance manner. The contact spring guide is arranged in the cylindrical section, where the contact spring guide is aligned in the cylindrical section. The bush has a lubricating layer (13) consisting of PTFE material. Independent claims are also included for the following: (1) a method for transmission of measurement current over a sliding bearing of a kinetics hinge support (2) a method for manufacturing an electrically conductive sliding bearing.

Description

The The invention relates to a slide bearing and method of transmission a measuring current. In particular, the invention relates to a plain bearing a moveable roof area, over which measuring currents a metrological monitoring system of entrapment hazard areas of the movable roof area are transmitted low impedance can.

such Plain bearings are usually used for mechanical transmission of forces and moments of hinge joints. Your electrical conductivity is correspondingly unreliable and is exposed to contact resistance fluctuations of several ohms. This unreliability mechanical plain bearing results arising from the bearing tolerances, the undefined contact pressure have between bearing pin and bearing bush of the sliding bearing. This is associated with the possibility that, for example accidentally occurring air gaps the line and thus also the conductivity deteriorate. Thus, such provide Plain bearing no process reliability, especially for plain bearings a movable roof area of a vehicle, the measuring currents in the microampere range for metrological monitoring of Containment hazard areas of folding and folding roofs a low-impedance transmission of a vehicle.

From the publication DE 10 2005 006 095 A1 For example, an electrically conductive, self-lubricating bearing system and method of using the system is known. For this purpose, the storage system has an electrically conductive carrier, wherein the carrier surface has electrically conductive ribs with recesses or valleys arranged therebetween. These recesses are filled with a self lubricating lubrication material, so that the electrically conductive ribs together with the lubrication material, which consists for example of a plastic compound, the bearing gap to form a bearing bush or a bearing pin. As already stated above, such bearing gaps have tolerances which allow a high variation of the contact resistance of a derarti conditions electrically conductive self-lubricating bearing system and provide no process reliability in the transmission of measuring currents.

task The invention is a plain bearing and a method of transmission a measuring current to create, regardless of the gap tolerances a sliding bearing a reliable and low-impedance Contact resistance ensured and the mechanical properties of the plain bearing despite wear on bearing pin and bearing bushing maintains

These The object is achieved with the subject matter of the independent claims solved. Advantageous developments of the invention result from the dependent claims.

According to the invention created a sliding bearing, in particular a plain bearing of a mobile Roof area of a vehicle, and a method of transmission a measuring current via the sliding bearing. The plain bearing points to a bearing pin and a sliding the bearing pin at least partially enclosing bearing bush. The Bearing bush has at least one electrically conductive contact spring tongue on, which contacted the bearing pin low impedance.

This Slide bearing has the advantage that the contact spring tongue a Permanent high conductivity is ensured even then is when with bearing wear of the bearing itself changed the sliding bearing gap. By the spring force of Contact spring tongue, which rests on the bearing pin, becomes permanent a metallic and thus electrically conductive connection low resistance maintained.

In An embodiment of the invention has the bearing bush a cylindrical portion which lubricates the bearing bolt at least partially enclosing, wherein the contact spring tongue is arranged in the cylindrical portion of the bearing bush. Thereby takes place in an advantageous manner, the contact inside the Storage location, so that subsequent processing steps for the hinge does not affect the function of the contact spring tongue. Even high temperatures of almost 180 ° C, as at a subsequent corrosion coating process occur, can function on the inside of the bearing point on the cylindrical portion of the bearing bush arranged contact spring tongue do not interfere. The bearing bush forms with the contact spring tongue in a further embodiment the invention is a one-piece component. That means, the contact spring tongue has the material of the bearing bush and has been worked out of the bushing material.

In a further embodiment of the invention, the cylindrical portion of the bearing bush on a parting line which is arranged parallel to an axis of a joint, wherein a free-resilient contact end of the contact spring tongue ends at this parting line. This has a manufacturing advantage, since exactly the contact spring tongue end coincides with the parting line and consequently facilitates the production. Alternatively, the contact spring tongue can also be arranged opposite to the parting line, which can improve the stability of the bearing bush, since the contact spring tongue does not contact the weakened location of the parting line of the bearing bush is ordered.

there For example, the contact spring tongue in the cylindrical portion may be radial be aligned. In an alternative embodiment the contact spring tongue is aligned axially parallel in the cylindrical portion. In the radial alignment of the contact spring tongue corresponds to Form of the contact spring tongue of the cylindrical shape of the cylindrical Section of the sliding bearing. With an axis-parallel alignment however, the contact spring tongue is aligned in a straight line like the axis. Only a pre-embossed contact area, the bearing pin should contact. protrudes from the cylindrical section springy inside out.

By This arrangement and shape, the slide bearing can be an electrical Contact resistance in ohms of less than 1 Ω and preferably smaller than 100 mΩ. The decisive factor is not only the magnitude of the contact resistance, but Also, the constancy of contact resistance, the metrological monitoring of Clamping areas in kinematics of sliding roof areas a vehicle is crucial.

Around the self-lubrication of the sliding bearing and the dimensional stability to ensure its components, has the bearing bush a carrier layer and a sliding layer, wherein the Carrier layer a solid metal and the sliding layer have a porous sintered metal with Gleitstoffeinlagerungen. This will ensure that the self-lubricating effect is ensured by the Gleitstoffeinlagerungen and through the porous sintered metal layer, a mechanical strength is reached, which the permissible gap widths of the sliding gap of the plain bearing guaranteed. The can Lubricant deposits Solid lubricants based on polytetrafluoroethylene (PTFE) exhibit.

The Contact spring tongue can in a further embodiment the invention only the material of the carrier layer have the bearing bush. In this case, the sliding layer becomes in the area of the future contact spring tongue of the multilayered Bearing material removed. Experiments have shown that at a correspondingly high contact pressure of the contact spring tongue this both the carrier layer and the sliding layer of Can have bearing bush without significant contact resistance fluctuations occur. This has the advantage that the contact spring tongue on the bearing pin slip through the support of the sliding layer, without the bearing pin or the contact area of the contact spring tongue to wear out. These measurements have revealed that the contact resistance by maintaining the sliding layer is not significantly different from a contact resistance, in which a Sliding zone provided by carrier layer material of the bearing bush is.

About that In addition, it is also possible for the contact spring tongue to realize a wear-resistant spring bronze. By doing Case, if not coincidentally, also the carrier material the bearing bush consists of a spring bronze, then is the contact spring tongue made of spring bronze with the cylindrical portion of the bearing bush electrically conductive and materially connected. The cohesive connection can by spot welding, diffusion soldering, brazing or by gluing. When gluing is on it though to ensure that a conductive adhesive is used.

Further has such a bearing bush at least on one end face of the cylindrical portion a disc-shaped collar on which a fixation on an articulated arm of the rotary joint joint allows. Such a slide bearing described above is preferably for linkage of a kinematics a folding or folding roof of a vehicle with metrological monitoring of Clamp hazard areas used.

One Method for transmitting a measuring current via a plain bearing of a kinematic joint, in particular a kinematic joint a movable roof area of a vehicle, has the following Procedural steps on. First, a bushing with a contact spring tongue in a cylindrical section of the Bushing equipped. Subsequently, an assembly takes place of the plain bearing with the introduction of a bearing pin in the Bearing bush, wherein the contact spring tongue lowers the bearing pin contacted. Subsequently, measuring currents can of a metrological monitoring system of anti-pinch areas over the slide bearing from the bearing pin to the bearing bush over the contact spring tongue and / or transferred in the reverse direction become.

This Method has the advantage that during insertion of the bearing pin in the bearing bush, a contact pressure of the contact spring tongue on the Coat of the bearing pin is exercised. This contact pressure ensures that the contact resistance remains low, or the electrical conductivity of such a sliding bearing constant, independent of the angle of rotation and over the Life of the plain bearing is consistent. It can during the Insertion of the bearing pin in the bearing bush a contact resistance through the contact spring tongue less than 1 Ω, preferably even less than 100 mΩ can be achieved.

A method for producing an electrically conductive sliding bearing, in particular a Plain bearing of a movable roof area of a vehicle, for transmitting a measuring current, has the following method steps. First, a metal strip is provided which has a carrier layer and a sintered metallic sliding layer with Gleitmitteleinlagerungen for a bearing bush. Subsequently, a cutting punching a contact spring tongue with pre-embossing of a contact region of the contact spring tongue in the metal strip in areas to be formed to a cylindrical portion of the bearing bush. Thereafter, the metal strip is separated into sections for bearing bushes.

After all the deformation of the sections to bushings with contact spring tongue and with a one-sided collar. In this condition, the bearing bush with its unilateral collar on one of two components of a Swivel joint to be mounted to a bearing point. After that is the bearing with the molding of an opposite Federal and the manufacture of tolerances and / or fits the Bearing point to the bearing pin by means of a calibration mandrel or a calibration tool calibrated.

After all there is a positive and non-positive connection of the bearing pin in a second component of the hinge joint under manufacture an electrically conductive connection. Finally then can still apply a nationwide corrosion protection done on the finished hinge joint. In this application is already the contact spring tongue by their location in the interior of the Depository from impairment by such Protected coating. Because such a coating at about 180 ° C, for example in a powder coating, can take place, the contact point or the contact spring tongue survive such a temperature without damage.

in the Interior of the bearings at the arranged the contact spring tongue is, there is good protection against corrosion. At the shown here Production of the contact spring tongue from the material of the bearing bush the area of the contact spring tongue only has to be made of the material the bushing is notched and then bent or be embossed. These processing steps can be a manufacturing process for rolled bushings provided become. It is also conceivable during the manufacturing process the area of the spring contact, for example with a laser beam to harden. But here for the transformation process the rest of the bush, to a cylindrical section with a collar and for the calibration during assembly the required to maintain softer properties.

One The second collar can be calibrated by calibrating the bearing bush on an opposite end face of the cylindrical Section of the bearing bush to be molded. The Anformung has the Advantage that the inner area of the bearing bush with the contact spring tongue is not affected and the function of the contact spring tongue during the calibration of the bearing bush and the molding of the second Federal is preserved.

About that In addition, it is provided that the positive and non-positive Connecting the bearing pin in the second component of the hinge connection done by wobble rivets. After assembling such a Plain bearing can be the application of a nationwide Corrosion protection by means of a powder coating on the finished Assembly are performed. It is preferred a cathodic dip coating used. This can be the cathodic Dipcoating done on a hood frame, whose Einklemmgefährdungsbereiche metrologically by means of the smallest Measuring currents are monitored in the microampere range should.

The The invention will now be more apparent from the accompanying drawings explained.

1 shows a schematic perspective view of a sliding bearing of a first embodiment of the invention;

2 shows different schematic views A, B and C of the bearing bush of the sliding bearing according to 1 ;

3 shows different schematic views A, B and C of a bearing bush of a sliding bearing of a second embodiment of the invention;

4 shows different schematic views A and B of a bearing bush of a sliding bearing of a third embodiment of the invention.

1 shows a schematic perspective view of a sliding bearing 1 a first embodiment of the invention. This slide bearing 1 has a plain bearing bush 5 and a bearing pin 4 on, with bearing bush 5 and the bearing pin 4 coaxial with an axis 10 a rotary joint connection are arranged. The bearing bush 5 slides with a cylindrical section 7 made of a backing layer 12 and a sliding layer 13 exists on the mantle surface 18 of the bearing bolt 4 , At the front ends 14 and 15 is each a covenant 16 and 17 arranged, which fix the bearing bush in an articulated arm, not shown.

The bearing bolt 4 cooperates with a second articulated arm of a rotary joint joint menwirkt. In this first embodiment of the invention is a contact spring tongue 6 radially aligned from the material of the cylindrical portion 7 the bearing bush 5 elaborated. The contact tongue 6 has a free-spring contact spring end 11 on, in which a contact spring area 19 the contact spring tongue 6 is impressed and a contact pressure on the lateral surface 18 of the bearing bolt 4 exercises.

Such a depository 20 has the advantage that not only mechanical forces can be transmitted through the rotary joint connection, but also that low impedance minimum measuring currents in the microampere range from a first articulated arm not shown here to a second articulated arm not shown here via the bearing pin 4 , the contact spring tongue 6 and the bearing bush 5 can be transmitted.

2 shows different schematic views A, B and C of the bearing bush 5 of the plain bearing 1 according to 1 , The view A is a side view, in which a parting line 9 can be seen, which results from the rolling production of the plain bearing bush made of a strip material. The contact spring tongue became preparatory from the strip material by means of cutting punches 6 with her contact spring area 19 produced. Here is the contact spring tongue 6 opposite to the parting line 9 arranged and forms with the bearing bush 5 a one-piece component 8th ,

The view B of the 2 shows a plan view of the bearing bush shown in view A. 5 , where clearly the free spring end 11 the contact spring tongue 6 you can see.

The view C of 2 is a left side view of the view A and shows the contact spring 6 in its almost complete length with the contact area 19 , With the contact spring tongue 6 a pressure can be exerted on a lateral surface of a bearing pin.

3 shows different schematic views A, B and C of a bearing bush 5 a plain bearing 2 a second embodiment of the invention. For this purpose, the view A shows a side view of the parting line 9 , In this embodiment of the invention, the free-resilient contact end 11 at the parting line 9 is arranged, which is economically feasible in terms of manufacturing technology.

The view B of the 3 shows a perspective view of the bearing bush 5 , which is made here of two materials, namely a carrier layer 12 and a sliding layer 13 , wherein the sliding layer 13 consists of a porous sintered metal, while the carrier layer 12 has a solid metal. In the cylindrical section 7 the bearing bush 5 For example, the pores of the sliding layer or of the sintered metal are filled with a solid lubricant based on a polytetrafluoroethylene, which ensures self-lubrication of the sliding bearing 2 provides.

The view C of 3 is a plan view of the bearing bush 5 as shown in view A. In the cylindrical section 7 the bearing bush 5 is in turn the contact area 19 the contact spring tongue 6 clearly visible, extending from the inner surface of the cylindrical section 7 takes off.

4 shows different schematic views A and B of a bearing bush 5 a plain bearing 3 a third embodiment of the invention. Components having the same functions as in the previous figures are identified by the same reference numerals and will not be discussed separately.

Both the view A and the view B are arranged in perspective and allow a view of an axially parallel arranged contact spring tongue 6 , in contrast to the radially symmetrically arranged contact spring tongues of the embodiments according to 1 to 3 , Such an axially parallel aligned contact spring tongue 6 assumes that they are not adjacent to the parting line 9 is provided. In this third embodiment of the invention, the contact spring tongue 6 opposite to the parting line 9 arranged, but this is not absolutely necessary, as long as the first fret 16 the bearing bush 5 holds together.

1

bearings (1st embodiment)

2

bearings (2nd embodiment)

3

bearings (3rd embodiment)

4

bearing bolt

5

bearing bush

6

Contact spring tongue

7

cylindrical Section of the bearing bush

8th

one-piece module

9

parting line

10

axis of a joint

11

free resilient contact spring end

12

backing the bearing bush

13

Overlay

14

front

15

front

16

Federation

17

Federation

18

coat of the bearing bolt

19

contact area the contact spring tongue

20

depository

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102005006095 A1 [0003]

Claims (26)

Plain bearings, in particular plain bearings ( 1 ) of a movable roof area of a vehicle, for transmitting a measuring current, wherein the plain bearing ( 1 ) a bearing pin ( 4 ) and a bearing pin ( 4 ) sliding at least partially enclosing bearing bush ( 5 ) and wherein the bearing bush ( 5 ) at least one electrically conductive contact spring tongue ( 6 ), which the bearing pin ( 5 ) low impedance with the bearing bush ( 5 ) connects. Sliding bearing according to claim 1, characterized in that the bearing bush ( 5 ) a cylindrical section ( 7 ), the bearing bolt ( 4 ) at least partially encloses, and wherein the contact spring tongue ( 6 ) in the cylindrical section ( 7 ) is arranged. Plain bearing according to claim 1 or claim 2, characterized in that the bearing bush ( 5 ) with the contact spring tongue ( 6 ) an integral component ( 8th ). Slide bearing according to one of the preceding claims, characterized in that the contact spring tongue ( 6 ) the material of the bearing bush ( 5 ) having. Slide bearing according to claim 2, characterized in that the cylindrical portion ( 6 ) a parting line ( 9 ) parallel to an axis ( 10 ) of a joint, and a free-springing contact end ( 11 ) of the contact spring tongue ( 6 ) ends at this parting line. Slide bearing according to claim 2, characterized in that the cylindrical portion ( 7 ) a parting line ( 9 ), which is arranged axially parallel, and the contact spring tongue ( 6 ) opposite to the parting line ( 9 ) is arranged. Slide bearing according to claim 2, characterized in that the contact spring tongue ( 6 ) in the cylindrical section ( 7 ) is radially aligned. Slide bearing according to claim 2, characterized in that the contact spring tongue ( 6 ) in the cylindrical section ( 7 ) is aligned parallel to the axis. Plain bearing according to one of the preceding claims, characterized in that the plain bearing ( 1 ) has an electrical contact resistance in ohms less than 1 Ω, preferably less than 100 mΩ. Sliding bearing according to one of the preceding claims, characterized in that the bearing bush ( 5 ) a carrier layer ( 12 ) and a sliding layer ( 13 ), wherein the carrier layer ( 12 ) a massive metal and the sliding layer ( 13 ) has a porous sintered metal with Gleitstoffeinlagerungen. Slide bearing according to claim 10, characterized that the lubricant deposits are solid lubricants based on PTFE exhibit. Slide bearing according to claim 10 or claim 11, characterized in that the contact spring tongue ( 6 ) the material of the carrier layer ( 12 ) of the bearing bush ( 5 ) having. Slide bearing according to one of claims 10 to 12, characterized in that the contact spring tongue ( 6 ) the carrier layer ( 12 ) and the sliding layer ( 13 ) of the bearing bush ( 5 ) having. Slide bearing according to one of the preceding claims, characterized in that the contact spring tongue ( 6 ) has a wear-resistant spring bronze and with the cylindrical portion ( 7 ) of the bearing bush ( 5 ) is electrically conductively and materially connected. Sliding bearing according to one of the preceding claims, characterized in that the bearing bush ( 5 ) on end faces ( 14 . 15 ) of the cylindrical section ( 7 ) at least one disc-shaped collar ( 16 ) having. Use of plain bearing ( 1 ) according to one of the preceding claims for linkage kinematics of a folding or folding roof of a vehicle with metrological monitoring of Einklemmgefährdungsbereichen. Method for transmitting a measuring current via a plain bearing ( 1 ) of a kinematic joint, in particular a kinematic joint of a movable roof area of a vehicle, the method comprising the following method steps, - equipping a bearing bush ( 5 ) with a contact spring tongue ( 6 ) in a cylindrical section ( 7 ) of the bearing bush ( 5 ); - Assembly of the sliding bearing ( 1 ) while inserting a bearing bolt ( 49 into the bearing bush ( 5 ), wherein the contact spring tongue ( 6 ) the bearing pin ( 4 ) contacted with low resistance; - Transmission of measurement currents of a metrological monitoring system of Einklemmgefährdungsbereichen on the slide bearing ( 1 ) from the bearing pin ( 4 ) to the bushing ( 5 ) via the contact spring tongue ( 6 ) and / or in the opposite direction. A method according to claim 17, characterized in that the contact spring tongue ( 5 ) during insertion of the bearing pin ( 4 ) in the bearing bush ( 5 ) a contact pressure on the jacket ( 18 ) of the bearing pin ( 4 ) exercises. A method according to claim 17 or claim 18, characterized in that during insertion of the bearing pin ( 4 ) in the bushing ( 5 ) sets a contact resistance in ohms smaller than 1 Ω, preferably smaller than 100 mΩ. Method for producing an electrically conductive plain bearing ( 1 ), in particular a sliding bearing of a movable roof area of a vehicle, for transmitting a measuring current, the method comprising the following method steps, - providing a metal strip from a carrier layer ( 12 ) and a sintered metallic sliding layer ( 13 ) with lubricant storage for a bearing bush ( 5 ); - Cutting punches of a contact spring tongue ( 6 ) with preprinting of a contact area ( 19 ) of the contact spring tongue ( 6 ) in the metal strip in areas that form a cylindrical section ( 7 ) of the bearing bush ( 5 ) are formed; - separating the metal strip into sections ( 7 ) for bushings ( 5 ); - deforming the sections ( 7 ) to bushings ( 5 ) with contact spring tongue ( 6 ) and unilateral collar ( 16 ); - mounting the bearing bush ( 5 ) in one of 2 components of a hinge connection to a storage location ( 20 ); - Calibrating the bearing ( 20 ) with molding of an opposite federal ( 17 ) and the tolerances and / or fits of the bearing ( 20 ) to the bearing pin ( 4 ) by means of a calibration mandrel or tool; - positive and non-positive connection of the bearing pin ( 4 ) in the second structural member of the hinge joint to form an electrically conductive connection; - Application of a comprehensive corrosion protection on the finished hinge joint. A method according to claim 20, characterized in that the deformation of the sections into cylindrical sections ( 7 ) of bushings ( 5 ) is achieved by means of a rolling process. Method according to claim 20 or 21, characterized in that the opposite collar ( 17 ) is positively formed Method according to one of claims 20 to 22, characterized in that the positive and non-positive connection of the bearing pin ( 4 ) takes place in the second component of the swivel joint by means of wobble rivets. Method according to one of claims 20 to 23, characterized in that the application of a nationwide Corrosion protection by means. a powder coating on the finished Assembly takes place. Method according to one of claims 20 to 24, characterized in that the application of a nationwide Corrosion protection by means of a cathodic dip coating (cathodic dip painting) the finished assembly takes place. Method according to one of claims 20 to 25, characterized in that the application of a nationwide Corrosion protection takes place on a hood frame, the Containment risk areas metrologically by means of smallest measuring currents be monitored in the microampere range.