DE202018105755U1 - Plastic sliding element with sensor function, especially with wear detection - Google Patents

Abstract

Plastic sliding element (10) for lubricant-free storage in a sliding bearing, whereby
- The sliding element (10) comprises a prefabricated, in particular prefabricated by injection molding, molded part (12) made of plastic, which has a sliding surface (14) for movably guiding two bearing parts relative to one another, and
- An electrical functional circuit (16) with a sensor function for detecting an operating parameter is arranged on the sliding element, characterized in that the functional circuit (16) is attached or printed on the molded part (12) made of plastic by an additive manufacturing method (AM method).

Description

The invention relates generally to a plastic sliding element with an integrated sensor function, which is suitable for use in plain bearings of any type. The invention relates in particular to a plastic sliding element for lubricant-free storage in a sliding bearing, which comprises a prefabricated molded part made of plastic, in particular an injection molded molded part, wherein an electrical functional circuit with a sensor function is arranged on the sliding element. This function circuit is used to detect an operating parameter, in particular the sliding element itself, such as the detection of excessive wear for the purpose of predictive maintenance. The sliding element has a sliding surface for sliding bearing and movable guidance or storage of two parts of a sliding bearing relative to each other.

Such a sliding element is already from the patent application WO 2017/182662 A1 previously known to the applicant. Here, the sliding element has a functional circuit with a detector, which changes its electrical properties in a critical area when there is a predetermined amount of wear, for example due to an open circuit. The functional circuit makes it possible to detect the change due to wear, in particular wirelessly using a transponder.

In terms of manufacturing technology, in WO 2017/182662 A1 proposed to arrange the detector element in a recess on the sliding surface. For example, an existing or adapted component of a film-like RFID transponder is proposed as the detector. Furthermore, a separate component is proposed as a detector element, which is connected to a commercially available RFID transponder, for example a shunt conductor. In both cases, the detector can be embedded or encapsulated in an additional process step. Exactly how the functional circuit, in particular the detector, is to be produced can be WO 2017/182662 A1 however open.

However, the combination of plastic components in complex geometries with integrated sensors creates difficulties in practice. For example, sensors printed on film cannot be combined with any component geometries because they cannot be deformed in any way. In many cases, integrating sensor functions into plastic sliding elements of various geometries is difficult.

A first object of the present invention is therefore to propose a plastic sliding element that can be equipped inexpensively and reliably even in large quantities with an electrical function circuit for sensory detection of an operating parameter.

This object is achieved by a plastic sliding element with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

According to the invention, in the case of a plastic sliding element according to the preamble of claim 1, it is proposed that the functional circuit be attached, applied or printed onto the prefabricated molded part made of plastic by means of an additive manufacturing method or AM method.

The functional circuit is thus preferably printed directly or immediately on the prefabricated plastic part of the sliding element. The functional circuit can be attached by suitable AM methods known per se, in particular by one in the sense of VDI 3405 standard or DIN EN ISO 17296-2 (Part II) called additive manufacturing process. Such AM processes allow inherently automated, computer-aided manufacture of complex, virtually any geometries, typically based on a layered construction. As an AM process, direct printing with automatic hardening of the printing compound or 3D printing by polymerization, 3D printing by gluing and 3D printing by sintering / fusing can be considered.

The functional circuit can be produced completely or integrally, in particular without any other discrete electrical components, in a coherent additive manufacturing process. Extrusion-based processes (English: extrusion-based: EB) are particularly suitable, either with chemical curing or with physical hardening of heated thermoplastic materials. For example, it seems suitable the FDM procedure (English: fused deposition modeling). MJ processes (English: material jetting) are also conceivable, e.g. with photopolymers that solidify through exposure to light. So-called BJ processes (English: binder jetting) are also suitable, sometimes also referred to as 3DP processes.

Basically, all so-called 3D printing techniques come into consideration. Due to their suitability for relatively viscous, conductive pastes, EB processes are preferred. In particular, an FLM or an FFF method for additive manufacturing is preferred.

In particular, the functional circuit can only fulfill its actual function by connection to a further circuit and must do so on its own in particular do not form a circuit. The functional circuit can, for example, form an electrical two-pole system, the electrical properties of which depend on the operating parameter to be detected.

In a preferred embodiment, the molded part, which defines the sliding surface in a predetermined or known geometry, is prefabricated from a tribopolymer, in particular prefabricated in one piece. The molded part can serve directly as a substrate or circuit carrier for the additively attached or printed functional circuit. It is also conceivable to provide an intermediate layer between the molded part and the additively printed or applied functional circuit, for example for imparting liability or for the purpose of additional electrical insulation. Typical tribopolymers naturally have relatively unfavorable adhesion properties in order to reduce the static and / or sliding friction.

In a preferred further development, the functional circuit additionally produced on the prefabricated molded part comprises at least one detector which is sensitive to the operating parameter to be monitored for the purpose of sensor function, and at least two contact areas for the releasable contacting of the functional circuit, in particular the detector, with a separately implemented circuit for evaluating an electrical signal of the detector. As a result, the sliding element can be exchanged easily and, despite the sensor function, has very low manufacturing costs. An advantage of AM methods is that pronounced contact areas for electrical connection in one process step together with other components, e.g. Conductor tracks can be produced.

In principle, any detector component or detector structure can be considered as the detector, which is preferably produced integrally during the additive manufacturing of the functional circuit. In particular, it can be a resistive detector for wear detection, for example due to an open circuit. However, other detector concepts are also conceivable, for example for temperature measurement or for deformation or force measurement. The detector, in particular, is the sensor in the sense of measurement technology (cf. DIN 1319-1), i.e. which is the part of the device that responds directly to the desired measured variable or variable to be recorded.

The additive manufacturing of the functional circuit can be simplified if the sliding element has a prefabricated recess structure on an outer surface, in which the finished functional circuit is at least partially or preferably completely inserted or embedded. By using a recess structure that can be produced, for example, by injection molding with low tolerances, inaccuracies in additive manufacturing, e.g. can be reduced or compensated for by flowing the not yet hardened conductor material. The recess structure is particularly preferably provided opposite the actual sliding surface in the prefabricated molded part, in order not to impair existing requirements or specifications of known sliding elements. Access for additive manufacturing is simplified if the recess structure for the functional circuit is provided on a convex outer surface of the sliding element.

The preferably complete inclusion of the functional circuit in an outside recess structure offers, among other things. the advantage that a sliding element expanded with a sensor function remains downward compatible with the component geometry of an existing or already mass-produced sliding element.

The recess structure can remain open to the outside after additive manufacturing of the functional circuit, or can subsequently be encapsulated for better protection against environmental influences, if necessary as part of additive manufacturing.

In an embodiment which is particularly suitable for wear detection, the recess structure comprises a depression which is arranged at least in regions at a distance from the actual sliding surface in such a way that the course of the depression corresponds to a wear limit to be detected. For the largest possible detection on the sliding element, it can be additionally or alternatively provided that the functional circuit, in particular the detector, extends over at least a predominant proportion of the circumferential angle or the axial length of the sliding surface of the sliding element, depending on whether it is an axial and / or or radial bearing. Even with a corresponding detection area, the functional circuit, in particular the detector structure, is preferably arranged at least partially within a recess on the outer surface.

Various materials are already known for producing electrically conductive structures by means of additive manufacturing. For example, printable pastes, liquids or thermoplastics with a silver content, copper content and / or carbon content (for example graphite or carbon black or CB = "carbon black") can be used. Preferably, a silver-based, conductive paste is used, such as a liquid resin with silver powder, such as type 5064H from DuPont® from (see data sheet MCM5064H / 2011). Other mixtures of a polymer matrix with conductive particles, in particular cheaper carbon particles (Graphite or CB) come into consideration if the finished material of the conductor tracks of the functional circuit has a significantly higher conductivity than the plastic or tribopolymer of the prefabricated molded part.

In a preferred embodiment, the functional circuit comprises at least conductor tracks and special contact areas, the conductor tracks and contact areas being printed or applied to the prefabricated plastic molded part in the same additive manufacturing process. The conductor tracks preferably have a layer thickness of 100 100 μm, for example in the range of approximately 5-50 μm, whereas the contact areas have a significantly greater layer thickness, in particular 200 200 μm, for example in the range of 250-500 μm.

The additively manufactured functional circuit is preferably purely passive, i.e. executed without its own energy source. In particular, it can be designed as a two-pole connection, which is to be connected to a separate evaluation circuit via the contact areas. In particular, the functional circuit can consist exclusively of conductor tracks and the contact areas or can be designed without discrete electrical or electronic components. This particularly simple design also allows e.g. resistive wear detection, in particular by resistive monitoring of an interruption in the conductor track structure in the functional circuit.

In the context of additive manufacturing, however, other types of detectors or sensors can also be manufactured in the sense of measurement variable pickups. For example, a capacitive or temperature-sensitive sensor structure can also be applied additively. Piezo-resistive structures have also been described in the more recent AM literature. A piezo-resistive detector that can be produced using the AM method has been described, for example, by Leigh SJ, Bradley RJ, et al. ("A Simple, Low-Cost Conductive Composite Material for 3D Printing of Electronic Sensors"; PLoS ONE 7 (11); 2012).

The combination of plain bearing parts produced in a known manner, in particular injection molded parts, with additive manufacturing or direct printing of electrical circuits is particularly advantageous if the molded part is prefabricated from a tribopolymer. Tribopolymers for lubricant-free storage are known per se and typically comprise a base polymer and microscopic solid lubricants. Furthermore, the tribopolymer can have reinforcing fibers and / or reinforcing fillers or other fillers. A suitable material is e.g. a tribopolymer from the iglidur® product range from igus GmbH, D-51147 Cologne. As intended, this type of sliding element is exposed to a certain amount of wear on the base polymer, which is intended to release the solid lubricant particles for solid lubrication with the bearing partner. Accordingly, wear detection is particularly advantageous here, which can be implemented inexpensively in the additive manufacturing process.

A plastic sliding element with sensor function according to one of the above exemplary embodiments is particularly suitable for sliding bearings for lubricant-free storage.

The plain bearing can have at least one such sliding element on a first bearing part. This serves for movable guidance relative to a second bearing part in a construction known per se for plain bearings. The bearing part with the sliding element or elements can represent either the bearing part or the bearing part (mechanical frame). This is not important for the invention. The proposed sliding elements can also be used for any type of bearing in the mechanical sense, for example radial bearings, axial bearings or combined axial / radial bearings etc.

A preferred further development of the plain bearing as a whole is provided on the first bearing part, spatially separated from the plain bearing, with an evaluation circuit to which the functional circuit of the sliding element is detachably or interchangeably connected for signal transmission via a line. For this purpose, for example, a special contact interface can be provided between the evaluation circuit and the functional circuit.

A corresponding contact device, which is connected to the evaluation circuit via a line, can be provided, for example, on a housing part of the first bearing part which holds the at least one sliding element. The contact device can in particular have spring contact pins for releasable contacting between the evaluation circuit and the functional circuit, in particular their contact areas, in order to facilitate an exchange of the sliding element. An interface for detachable contacting with the sliding element (s) makes it possible to separate the components, which are more complex or more expensive to manufacture, from the sliding elements, on a part of the sliding bearing that is not susceptible to wear.

The contact device can also be designed to secure the position of the sliding element, for example to secure the sliding element axially and / or radially. This can be achieved in particular by suitable housing design, so that a mechanical locking takes place at the same time as the electrical contact.

Depending on the plain bearing application, the first bearing part can be designed, for example, as a bearing housing or bearing slide. However, the first bearing part can also e.g. be a bearing holder for a sliding element designed as a bearing bush.

A module can be attached to the first bearing part, which module includes the evaluation circuit and a power supply, for example a battery for the evaluation circuit.

In a further development, in particular for linear guides, it is provided that the first bearing part with the evaluation circuit comprises a plurality of sliding elements with a respective functional circuit. Each of the sliding elements can be connected to the evaluation circuit in an exchangeable or detachable manner, so that several sliding elements are monitored with the same evaluation circuit. The evaluation circuit evaluates at least one operating parameter, for example the state or electrical resistance of a simple conductor loop as a functional circuit. According to WO 2017/182662 A1 For example, by monitoring conductor interruption caused by wear, valuable information about the operating state of the plain bearing or sliding element can be obtained.

The evaluation circuit can further comprise a communication module, in particular a radio communication module, which is set up to transmit an evaluation result to a higher-level monitoring system. Any wired or wireless technologies for data transmission can be used for this.

The proposed slide element or slide bearing is particularly suitable for use in a lubricant-free linear slide guide, but also for a large number of other slide bearings, e.g. for simple, inexpensive plain bearing bushes for lubrication-free radial bearings.

• 1A-1B: perspektivische Ansichten eines Kunststoff-Gleitelements mit einer elektrische Funktionsschaltung mit Sensorfunktion zur Erfassung eines Betriebsparameters;
• 2A-2B: perspektivische Ansichten einer Kontaktvorrichtung zur lösbaren Kontaktierung der Funktionsschaltung am Gleitelement nach 1A-1B; und
• 3: eine perspektivische Ansicht eines Lagerschlittens für eine Linearführung mit mehreren Gleitelementen nach 1A-1B und Kontaktvorrichtungen nach 2A-2B, sowie einem Modul mit einer Auswerteschaltung und einer Energieversorgung, in z.T. explodierter Darstellung.

Further details, features and advantages of the invention result - without restricting the generality of the above teaching - from the following, detailed description of a preferred exemplary embodiment with reference to the attached figures. Here show:

• 1A-1B : Perspective views of a plastic sliding element with an electrical function circuit with sensor function for detecting an operating parameter;
• 2A-2B : Perspective views of a contact device for releasable contacting of the functional circuit on the sliding element according to 1A-1B ; and
• 3 : A perspective view of a bearing carriage for a linear guide with several sliding elements according to 1A-1B and contact devices according to 2A-2B , as well as a module with an evaluation circuit and a power supply, partly exploded.

The purely exemplary in 1A-1B shown sliding element, generally with 10 referred to, comprises a molded part as the main component 12 which is prefabricated in an injection molding process from a tribopolymer, for example from a tribopolymer of the iglidur® type from igus GmbH, D-51147 Cologne. The molding 12 forms an internal sliding surface 14 for flexible guidance and sliding relative positioning of two bearing parts. The concave sliding surface 14 is in 1A-1B designed essentially cylindrical, for example, for linear sliding guidance on a profile rail with a guide profile that is round in cross section, for example on a double rail made of metal (not shown) of the type drylin® W from igus GmbH. Other profile cross sections of the molded part 12 are within the scope of the invention. The geometry and design of the sliding element relevant for the guidance 10 can, for example, from teaching WO 97/40281 A1 who are teaching US 7,217,034 B2 respectively. DE 20 2004 016 094 U1 or also from DE 20 2016 101 698 U1 correspond to, whose teachings on shortening are included here.

On the sliding surface 14 opposite outer surface 13 of the sliding element 10 is a recess structure in the injection molding process 15 prefabricated. The cut-out structure 15 forms a coherent depression opposite the outer surface 13 with a constant depth here in relation to the contour or envelope of the outer surface 13 , The base or bottom of the cutout structure 15 lies at a constant distance from the opposite sliding surface 14 , The predetermined depth corresponds to a nominal wear limit in relation to the wearing sliding surface 14 when they reach the sliding element 10 should be replaced. The desired depth can be precisely set in the injection molding process. With regard to the wear limit, for example, the teaching WO 2017/182662 A1 directed. The cross section of the recess structure 15 can be rectangular or square, for example, with a side length of approx. 0.5-1mm.

In the recess structure 15 on the convex outer surface 13 is an electrical functional circuit 16 introduced which the bottom of the recess structure 15 completely filled out or documented here. The recess structure 15 and thus the functional circuit 16 expires in the example 1A-1B in several meandering or U-shaped loops and over a predominant part of the effective circumferential angle and also the effective axial length of the sliding surface 13 with in particular two end ring sections 16A . 16B which, apart from an edge area, the total circumference of the sliding surface 13 correspond. The selected topology of the cutout structure 15 or function circuit 16 should provide the best possible coverage of experience-critical parts of the sliding surface 13 achieve for all installation positions, which is typical of the type of sliding element 10 and its application depends.

In the embodiment according to 1-3 should the functional circuit 16 as the operating parameter the progressive wear, which is the useful wall thickness of the sliding element 10 reduced, capture. The function circuit exists for this 16 here only from the meandering conductor loop, which acts as a wear-sensitive detector 17 serves to detect a wear-related interruption of the conductor loop, as well as two contact areas 18A . 18B at the open ends of this conductor loop. The contact areas 18A . 18B are used for interchangeable contacting, such as 2A-2B explained below. The functional circuit 16 is therefore purely passive, has no pronounced electrical components (resistors, capacitors, coils) and can be produced at low manufacturing costs.

According to the functional circuit 16 in a suitable technique directly within the recess structure 15 on the molding 12 printed, in particular by direct printing or a suitable AM process, for example an EB process. The functional circuit 16 , ie here the conductor loop or the detector 17 and the contact areas 18A . 18B can be applied directly and integrally in one process step. The conductive structures of the functional circuit 16 can be made, for example, from a suitable printable silver paste or a thermoplastic with a suitable carbon content. After curing, the detector structure should 17 have a multiple times higher conductivity than the tribopolymer of the molded part 12 , If necessary, an adhesion promoter, also in appropriate printing or AM technology, can be placed on the bottom of the recess structure 15 be applied.

For reliable contacting, the contact areas 18A . 18B a larger layer thickness, for example in the range of 250-400 µm, compared to approximately 5-50 µm for the other conductor topology of the detector 17 exhibit. The conductor width corresponds to the predefined width of the recess structure 15 , for example about 500µm up to a few millimeters, depending on the dimensions of the sliding element 10 ,

2A-2B show a contact device 20 which is the replacement of the sliding element 10 simplified. The contact device 20 comprises two spring contact pins or pressure spring contacts 22 for electrical contacting of the end contact areas 18A . 18B the functional circuit 16 on the sliding element 10 (by arrows in 2 B illustrated). The spring contact pins 22 are with additional connector pins 23 on a circuit board 24 attached and conductively connected to these. The connector pins 23 are used for the plug connection with connecting lines of an evaluation circuit 42 ( 3 ). The circuit board 24 is on a lid-like holder 25 attached, which is made as an injection molded part and two holding arms 26 for attachment. The keeper 25 also includes a safety pin 27 the one in a locking groove 19 on the sliding element 10 (see. 1B and 2 B) for axial securing of the sliding element 10 intervenes.

3 shows a guide carriage 30 as a stored bearing part of a linear slide guide with, for example, four identical slide elements 10 to 1A-1B for plain bearings on a double profile rail. If necessary, it can also be only a sliding element serving as an indicator 10 to 1A-1B can be used with three conventional sliding elements. The sliding elements 10 are each in a separate housing bearing 32 added, the corner on a sled plate 37 of the carriage 30 is appropriate. The sled plate 37 is used for mounting on the machine part to be guided. At least one or more sliding elements 10 have a functional circuit 16 ( 1A-1B) based on an associated contact device 20 ( 2A-2B) is electrically contacted. The contact devices 20 are in corresponding recordings 33 arranged and based on the holding arms 26 with locking openings on the front 35 of the respective housing bearing 32 can be locked without tools. In the sled plate 37 are with every recording 33 ducts 34 incorporated or provided with sockets in which a respective connection line for the corresponding functional circuit 16 to be led. The contacting of the pressure spring contacts 22 and connector pins 23 takes place when the contact device is locked 20 ,

At the bottom of the slide 30 is a recording 38 provided in which an electronic module 40 for connecting the functional circuits 16 via the respective contact devices 20 is provided. The module 40 includes a common evaluation circuit 42 , for example with a microprocessor, and a battery 44 for energy supply. Using the contact devices 20 can the sliding elements 10 can be easily replaced when the service life is reached, especially without any intervention on the module 40 ,

The evaluation circuit 42 monitors at least the state of wear of the sliding elements 10 via the connected function circuits 16 , Reaches the abrasion of a sliding element 10 the predetermined wear limit becomes the detector structure 17 severed or their resistance increased. The evaluation circuit 42 detects whether the one with the functional circuits 16 formed circuit is interrupted or the electrical resistance increases sharply and thereby recognizes the reaching of the wear limit.

The evaluation circuit 42 can also record other operating parameters of the plain bearing, such as acceleration, temperature and humidity values. The evaluation circuit 42 comprises a communication module (not shown separately) for data transmission of sensor data or evaluation results to a higher-level monitoring system, for example via a suitable protocol for radio communication. With regard to suitable communication technology, the teaching is shortened, for example WO 2018/115528 A1 , especially the ones there 8-9 directed.

As intended, the invention enables the condition monitoring of sliding elements or plain bearings equipped therewith and allows, inter alia, Avoid unplanned failures, make optimal use of the life of the sliding elements and reduce maintenance costs.

LIST OF REFERENCE NUMBERS

• 1A-1B

  10

  Slide

  12

  molding

  13

  outer surface

  14

  sliding surface

  15

  recess structure

  16

  function circuit

  16A, 16B

  ring section

  17

  detector

  18A, 18B

  contact areas

  19

  securing groove

• 2A-2B

  10

  Slide

  12

  molding

  13

  outer surface

  14

  sliding surface

  16

  function circuit

  20

  contact device

  22

  Spring contact pin / spring contact

  23

  pin

  24

  circuit board

  25

  holder

  26

  holding arms

  27

  Security bolt

• 3

  10

  Slide

  16

  function circuit

  20

  contact device

  30

  guide carriage

  32

  Housing bearing (for sliding element)

  33

  Holder (for contact device)

  34

  duct

  36

  latching opening

  37

  carriage plate

  38

  Recording (for module 40 )

  40

  module

  42

  evaluation

  44

  battery

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Patent literature cited

• WO 2017/182662 A1 [0002, 0003, 0031, 0036]
• WO 9740281 A1 [0035]
• US 7217034 B2 [0035]
• DE 202004016094 U1 [0035]
• DE 202016101698 U1 [0035]
• WO 2018/115528 A1 [0045]

Non-patent literature cited

• Standard VDI 3405 [0008]
• DIN EN ISO 17296-2 [0008]

Claims (17)

Plastic sliding element (10) for lubricant-free storage in a sliding bearing, the sliding element (10) comprising a prefabricated, in particular injection molding, molded part (12) made of plastic, which has a sliding surface (14) for the movable guidance of two bearing parts relative to one another, and - an electrical functional circuit (16) with a sensor function for detecting an operating parameter is arranged on the sliding element, characterized in that the functional circuit (16) is attached or printed on the molded part (12) made of plastic by means of an additive manufacturing method (AM method) is. Sliding element after Claim 1 , characterized in that the molded part (12) is prefabricated from a tribopolymer and serves as a circuit carrier for the functional circuit (16). Sliding element after Claim 1 or 2 , characterized in that the functional circuit (16) comprises a detector (17) sensitive to the operating parameter and contact areas (18A, 18B) for detachable contacting. Sliding element after Claim 1 . 2 or 3 characterized in that the sliding element (10) has a prefabricated recess structure (15) on an outer surface (13), in particular opposite the sliding surface (14), in which the functional circuit (16) lies at least partially or completely, the outer surface ( 13) is preferably convex. Sliding element after Claim 4 , characterized in that the recess structure (15) comprises a recess which extends at least in regions at a distance from the sliding surface (14) which corresponds to a wear limit to be recognized and / or extends over at least a predominant proportion of the circumferential angle or the axial length of the sliding surface , Sliding element according to one of the preceding claims, characterized in that the functional circuit (16) is applied directly and / or integrally to the prefabricated plastic part (12), preferably by an EB method. Sliding element according to one of the preceding claims, characterized in that the functional circuit (16) is made of a material with a silver, copper and / or carbon content, the material having a significantly higher conductivity than the plastic of the prefabricated molded part ( 12). Sliding element according to one of the preceding claims, characterized in that the functional circuit (16) comprises conductor tracks which are additively applied by the AM method and preferably have a layer thickness of ≤100 µm, in particular in the range of 5-50 µm, and contact areas (18A, 18B), which are applied additively by the same AM process and preferably have a layer thickness of 200 200 μm, in particular in the range of 250-500 μm. Sliding element according to one of the preceding claims, characterized in that the functional circuit (16) is passive and in particular consists of conductor tracks and contact areas (18A, 18B) and is used for resistive wear detection, in particular by conductor interruption. Sliding element according to one of the preceding claims, characterized in that the molded part (12) is prefabricated from a tribopolymer which has a base polymer and solid lubricants and preferably reinforcing fibers and / or fillers. Slide bearing for lubricant-free storage, with a first bearing part (30) and a second bearing part, the first bearing part (30) having at least one sliding element (10) according to one of the Claims 1 to 10 comprises, which serves to move the second bearing part relative to the first bearing part, characterized in that an evaluation circuit (42) is provided on the first bearing part (30), which is detachably connected to the functional circuit on the at least one sliding element. Plain bearing after Claim 11 , characterized in that the first bearing part (30) on a housing part (32) holding the at least one sliding element has a contact device (20) connected to the evaluation circuit (42), in particular with spring contact pins (22), for releasably contacting the evaluation circuit (42) with the functional circuit (16). Plain bearing after Claim 12 , characterized in that the contact device (20) is designed with a holder (25) for securing the position, in particular axial and / or radial securing of the sliding element (10). Plain bearing after Claim 11 . 12 or 13 , characterized in that the first bearing part is designed as a bearing housing or slide (30) and comprises an attached module (40) with the evaluation circuit (42) and with a power supply (44). Plain bearing according to one of the Claims 11 to 14 , characterized in that the first bearing part (30) has a first sliding element (10) according to one of the Claims 1 to 10 comprises and a second sliding element (10) according to one of the Claims 1 to 10 The respective functional circuit (16) of the first and second sliding elements are detachably connected to the evaluation circuit (42) for signal transmission. Plain bearing according to one of the Claims 11 to 15 , characterized in that the evaluation circuit (42) evaluates at least one operating parameter on the basis of the functional circuit (s) (16) and comprises a communication module which is set up to transmit an evaluation result to a superordinate monitoring system. Use of a plain bearing according to one of the Claims 11 to 16 , in a lubricant-free linear slide guide.

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