STATICALLY OPTIMIZED HYBRID ROLLER BEARING

Description

[0001] The invention relates to a bearing according to the preamble of claim 1 as well as a bearing arrangement with such a bearing and the use of such a bearing.

[0002] Bearings of this type are used for longitudinally sliding mounting, particularly lubricant-free mounting, of work devices on a rail. These bearings are based on a hybrid principle, in which the mounting is based on both rollers and sliding elements. Such a bearing has a housing in which a receiving channel is provided that extends longitudinally through the housing. Furthermore, such a bearing has at least one roller and at least one sliding element. The roller is rotatably mounted in the housing with respect to a roller axis that runs perpendicular to the longitudinal direction.When the bearing is used as intended, a guide section of a rail, designed in the manner of a cylinder, is received in the receiving channel and rests against a running surface of the roller, and the at least one sliding element encloses the guide section over an angular range of more than 200°, in particular more than 220°. When used as intended, a working device is arranged on the bearing such that the roller transfers the main load to the guide section and rolls along the guide section when the bearing is displaced relative to the guide section in the longitudinal direction, whereas the sliding element is provided offset in the longitudinal direction to the roller, so that in the event of a transverse load, iea load perpendicular to the main load direction and perpendicular to the longitudinal direction, on the bearing relative to the guide section of the rail, the sliding element slides along the guide section when the bearing is longitudinally displaced relative to the guide section by this transverse load, pressed against the guide section.Bearings of this type are particularly suitable for work devices that are moved manually in the longitudinal direction, for example in camera technology, machine tool doors or panels, since such bearings, thanks to the hybrid technology used, can carry large loads along a rail with very little friction and, on the other hand, when the work device and thus the bearing are moved manually, any transverse forces that occur are absorbed by the sliding element used, meaning that the work device attached to the bearing can be moved along the rail without significant noise and without significant friction.

[0003] In bearings of this type, the roller and sliding element are arranged in the housing passage in such a way that they are coordinated with one another that when the bearing is loaded along the main load direction, i.e. when the load is perpendicular to the roller axis, the sliding element rests against the guide section with the smallest possible contact area. However, such a bearing is limited when loaded in the main load direction, on the one hand by the material of the housing and the roller and, if a separate roller axis is provided which is attached to the housing and on which the roller is rotatably mounted, by the material of the roller axis. If the load in the main load direction is too great, considerable wear and tear and, in particular, increased friction occur.Accordingly, such bearings are only intended for use up to a static load capacity specified by the manufacturer, based on a load in the main load direction, and a dynamic load capacity based on a load in the main load direction, whereby the dynamic load capacity is specified as a function of the intended total travel distance. When supporting work equipment sliding in the longitudinal direction using such bearings, the load of which is so great that the static load capacity is exceeded, it is necessary to provide a large number of bearings arranged one behind the other along the longitudinal direction and thus connected in parallel with respect to the main load direction, thus jointly supporting the load applied by the work equipment.However, it has proven problematic that such a large number of bearings requires a complicated installation to prevent unwanted friction between the guide section of the rail and the bearings, or excessive wear on the bearings, especially their rollers. This is because the bearings must be precisely aligned with the longitudinal axes of their bushings, as each bearing uniquely determines the position of the guide section perpendicular to the longitudinal direction. Any deviation in the alignment of the longitudinal axes of the various bearings leads to an overdetermined positioning of the guide section due to the bearing arrangement resulting from the bearings, and is accompanied by corresponding friction losses and loads.

[0004] A bearing according to the preamble of claim 1 is known from US 4 714 354 A. Further prior art is known from the publications JP H05 149334 A, US 2015 / 176643 A1, US 5 281 029 A and DE 32 24 282 A1.

[0005] The present invention is based on the object of providing a bearing and / or a bearing arrangement and / or a use of a bearing by which at least one disadvantage of generic bearings is at least partially eliminated.

[0006] As a solution to the problem underlying the present invention, the invention proposes a bearing with the features according to claim 1. The bearing according to the invention is suitable for supporting a cylindrical guide section of a rail, the cylindrical guide section extending in the longitudinal direction with its cylinder axis, in a displaceable manner in the longitudinal direction. The bearing is based on rollers and sliding elements, so that the bearing is carried out on at least one roller and at least one sliding element. The bearing comprises a housing which has a passage which runs through the housing along a longitudinal axis which extends in the longitudinal direction. A receiving channel for receiving the guide section of the rail is formed in the passage. When the bearing is used as intended, the guide section is arranged with its cylinder axis aligned along the longitudinal axis of the passage in the receiving channel.The receiving channel is at least partially closed perpendicular to the longitudinal direction, in particular over an angular range of at least 200°, in particular at least 220°, in particular at least 240°, in particular at least 260°, preferably continuously closed. This enclosure preferably occurs over at least 50%, in particular at least 80% of the extension length of the feedthrough along its longitudinal axis. The receiving channel lies completely within the feedthrough. The receiving channel can, for example, be delimited in sections by the feedthrough itself in its extension perpendicular to the longitudinal direction, in some embodiments by elements of the bearing arranged in the feedthrough, i.e. at least extending into the feedthrough, for example by sliding elements and rollers arranged in the feedthrough.By the bushing extending longitudinally through the housing, the cylindrical guide section of the rail can be arranged in the receiving channel arranged in the bushing and with such an arrangement of such a guide section, the extension length of which in the longitudinal direction is at least five times, in particular at least ten times the extension length of the housing in the longitudinal direction, the bearing can be displaced longitudinally along the guide section while it is arranged in the receiving channel.

[0007] According to the proposed solution, the bearing has two rollers spaced apart in the longitudinal direction, each of which is rotatably mounted in the housing about a roller axis running perpendicular to the longitudinal direction and with its running surfaces delimiting the receiving channel in a transverse direction running perpendicular to its roller axis. Each roller is thus mounted in the housing in such a way that it can rotate about a roller axis assigned to it. This can be achieved, for example, by a bearing attached to the circumference of the respective roller and thus by a bearing on its running surface outside the receiving channel. Preferably, however, this is achieved via a roller axis that is firmly connected to the housing or integrated into the housing, which runs through the center of the roller and on which the roller is rotatably mounted so that its running surface circumferentially encloses the roller axis. Each roller extends with its running surface, i.e.with its radial end, at least partially into the passage, so that it delimits the receiving channel provided in the passage perpendicular to the longitudinal direction. When the bearing is used as intended, the cylindrical guide section lies in the receiving channel and thereby against the running surfaces of the rollers. Accordingly, each roller delimits the receiving channel in a transverse direction that runs perpendicular to its respective roller axis and to the longitudinal direction. Each roller is thus clearly assigned a transverse direction. Preferably, all rollers are assigned the same transverse direction so that the roller axes run parallel.In some embodiments, the bearing can also have more than two rollers, for example a first pair of rollers at a first position in the longitudinal direction and a second pair of rollers at a second position in the longitudinal direction, wherein the roller axes of the rollers of each pair are tilted relative to one another by an angle about the longitudinal direction, so that when used as intended they bear against two circumferential sections of the guide section that are offset from one another by a corresponding angle about the longitudinal axis. In such an embodiment, the roller axes of one roller in each pair are preferably aligned parallel to one another. The roller axes of the rollers of a pair preferably have an angle about the longitudinal axis of less than 120°, in particular less than 90°.Preferably, only one roller or a pair of rollers is provided in the bearing at each of two longitudinal positions, wherein these longitudinal positions are spaced apart from one another in the longitudinal direction, as explained. The housing further has, in the longitudinal direction between the rollers or between the said positions of the rollers in the longitudinal direction, a mounting channel running through the housing perpendicular to the longitudinal direction along a mounting axis. The mounting axis thus runs in a transverse direction perpendicular to the longitudinal direction. The mounting channel is suitable for receiving a preferably cylindrical mounting bolt in such a way that the mounting bolt is arranged in the mounting channel, extends through the housing along the mounting axis and is rotatable in the receptacle about the mounting axis, but is fixed in its longitudinal position by the mounting channel.Of course, instead of a mounting bolt, a mounting bushing can also be arranged in the mounting channel, or a mounting bushing can be arranged in the mounting channel, in which a mounting bolt is arranged. The mounting bushing is accordingly received in the mounting channel, extends along the mounting axis through the housing and is rotatably mounted about the mounting axis, but its position is fixed in the longitudinal direction by the mounting channel. Furthermore, a plurality of sliding elements are arranged in the feedthrough, spaced apart from one another in the longitudinal direction and offset longitudinally relative to the rollers, each of which delimits the receiving channel with one of its sides perpendicular to the longitudinal direction.By providing a plurality of sliding elements which are offset in the longitudinal direction relative to the rollers and which delimit the receiving channel, the guide section can come into contact with at least one of the sliding elements when the bearing is used as intended if the guide section experiences a force perpendicular to the longitudinal direction relative to the bearing, which force has a force component perpendicular to the transverse directions of the rollers, so that even in such a case a low-noise and low-friction, longitudinally displaceable mounting of the guide section in the receiving channel is ensured, since even then the housing only rests on the guide section via at least one roller and at least one sliding element, which is generally advantageous according to the invention.

[0008] The bearing according to the invention offers a number of advantages. The combination of two rollers spaced apart in the longitudinal direction and several sliding elements spaced apart in the longitudinal direction and offset from the rollers ensures that the guide section always contacts the bearing with as little friction as possible, even when forces are applied with a component perpendicular to the longitudinal direction and perpendicular to the transverse direction. This prevents excessive wear, thus achieving a long bearing service life. By providing two rollers spaced apart in the longitudinal direction, both rollers can absorb a load from a work device attached to the bearing in the main load direction.The main load direction is preferably parallel to the transverse directions of the two rollers spaced apart from one another in the longitudinal direction or parallel to the angle bisector of the transverse directions of the rollers of a respective pair of rollers, provided that a pair of rollers is provided at each longitudinal position. As a result, the bearing is also suitable for use with large loads, in particular with a static load-bearing capacity of more than 400 N, in particular more than 700 N, and with a dynamic load-bearing capacity of more than 400 N, in particular more than 700 N, for a total running distance of 10 km, wherein the load-bearing capacity is based on a load along the main load direction. According to the invention, the mounting channel is further provided in the longitudinal direction between the rollers, in which a mounting bolt and / or a mounting bushing is rotatably received, the bearing can be mounted via such a mounting bolt orSuch a mounting bushing can be attached to a component and, when a force acts between the guide section of the rail and the bearing, can be rotated around the bolt or the bushing with a force component perpendicular to the main load direction and perpendicular to the longitudinal direction, while the guide section rests against at least one roller and at least one sliding element. Jamming of the guide section in the bearing can thus be prevented. This is particularly advantageous when using two bearings spaced apart from one another in the longitudinal direction, since these bearings can rotate relative to one another even if the longitudinal axes of their bushings are not completely aligned with one another by rotating around their respective mounting bolt or mounting bushing, so that jamming of the guide section relative to the bearings is prevented even when used in this way.The invention therefore particularly also relates to the use of two bearings spaced apart from one another in the longitudinal direction as a bearing arrangement via which a force in the main load direction of preferably at least 800 N, in particular at least 1000 N, in particular at least 1500 N can be carried in the intended manner in a sliding manner in the longitudinal direction on a rail. Generally speaking, the running surfaces of the two rollers spaced apart from one another in the longitudinal direction each bear against the same straight line which runs parallel to the longitudinal axis of the bushing and delimits the receiving channel in a direction perpendicular to the longitudinal direction. The sliding elements preferably extend with their cross section perpendicular to the longitudinal direction in the manner of a circular arc section, through the center of which the longitudinal axis of the bushing runs.The circular arc section is preferably continuously closed over an angular range of at least 200°, in particular at least 220°, in particular at least 240°, in particular at least 260° around the longitudinal axis.

[0009] Generally, the bearing preferably has a mounting bushing rotatably mounted in the mounting channel. The mounting bushing is preferably cylindrical and extends with its cylindrical axis along the mounting axis. The mounting bushing is preferably arranged in the mounting channel such that it has a play of less than 0.5 mm, in particular less than 0.2 mm, in the longitudinal direction. The mounting bushing preferably projects beyond the housing along the mounting axis on at least one side. This makes it possible for the mounting bushing to be fixed in a fixed position to a component at its ends without restricting the rotatability of the housing relative to the mounting bushing.

[0010] The housing preferably has a first and a second housing part, which are arranged next to one another along the mounting axis and are releasably fixed to one another. Both housing parts together form the mounting channel and / or the passage. The provision of two releasably connected housing parts particularly simplifies the manufacture and assembly of a bearing according to the invention.

[0011] Particularly preferably, the mounting channel is equidistant in the longitudinal direction from both rollers or both longitudinal positions of the rollers or pairs of rollers arranged offset from one another in the longitudinal direction. This has the particular advantage that, under any force load perpendicular to the longitudinal direction and perpendicular to the transverse direction of the rollers, the bearing can be rotated uniformly by rotating about a mounting bushing arranged in the mounting channel or a mounting bolt arranged in the mounting channel. Preferably, the mounting axis and roller axes all run perpendicular to the longitudinal axis, with the mounting axis being equidistant in the longitudinal direction from both roller axes. Particularly preferably, the mounting channel is arranged on the same side of the receiving channel as the roller axes.The roller axes and the mounting channel are of course arranged outside the receiving channel with respect to a direction perpendicular to the longitudinal direction, preferably on the same side of the receiving channel with respect to this direction. Preferably, at least one sliding element is arranged in each longitudinal end section of the feedthrough. The feedthrough has two longitudinal end sections opposite each other in the longitudinal direction. Each longitudinal end section extends from the absolute longitudinal end of the feedthrough assigned to it over a maximum of 30%, in particular a maximum of 20%, in particular a maximum of 10% of the extension length of the feedthrough in the longitudinal direction. Preferably, one sliding element is arranged exclusively within the respective longitudinal end section. Preferably, the mounting channel or the mounting axis is equidistant along the longitudinal direction from the two sliding elements arranged in the two longitudinal end sections of the feedthrough.Preferably, the respective sliding element arranged in the respective longitudinal end section is arranged closer to the absolute longitudinal end of the housing assigned to it than the roller closest to it in the longitudinal direction. Preferably, the sliding elements arranged in the longitudinal end sections are each spaced by the same distance in the longitudinal direction from the roller closest to them in the longitudinal direction.

[0012] Particularly preferably, the running surfaces of the rollers have a concave contour facing the receiving channel. Due to the concave contour, the rollers can bear particularly advantageously against the guide section and, in particular, contribute to further guiding the guide section. Particularly preferably, the contours have a cross-section shaped like a spherical section perpendicular to the longitudinal direction. This is particularly advantageous when the guide section is designed like a cylinder with a round or oval cross-section.

[0013] In one embodiment, the mounting bushing has a radial projection on its outer side, in particular designed as a flange. The projection extends radially and thus perpendicular to the mounting axis. The projection is arranged in a radial extension of the mounting channel, which is delimited on both sides within the housing along the mounting axis. The mounting channel is preferably designed in the manner of a cylinder which has the radial extension. By delimiting the radial extension on both sides, the radial extension forms stops for the projection, which determine a position of the projection along the mounting axis. The position of the mounting bushing relative to the housing along the mounting axis is thus determined by the arrangement of the projection in the radial extension of the mounting channel.Particularly preferably, the radial expansion of the mounting channel is formed by transverse ends of the two housing parts facing each other along the mounting axis. The radial expansion is thus formed jointly by both housing parts. The transverse ends refer to the ends of the housing parts with which they face each other along the mounting axis and, in particular, abut one another. The formation of the radial expansion by the two housing parts particularly facilitates the manufacturability of the bearing. Particularly preferably, a first sliding part, in particular a hollow cylindrical part, is provided in the mounting channel between the housing and the mounting bushing. The sliding part ensures low-friction rotatability of the mounting bushing relative to the housing.The first sliding part preferably has a first sliding part projection, with which it is arranged in a first section of the radial extension of the mounting channel for determining a position of the first sliding part relative to the housing along the mounting axis. A second sliding part is preferably provided in the mounting channel along the mounting axis, offset from the first sliding part, which second sliding part preferably has a second sliding part projection, with which it is arranged in a second section of the radial extension of the mounting channel for determining a position of the second sliding part relative to the housing along the mounting axis. The projection of the mounting bushing preferably bears against the first sliding part projection with a first side along the mounting axis and against the second sliding part projection with a second side facing away from the first side.The radial extension is preferably a continuous radial extension along the mounting axis, wherein the two sliding part projections and the projection of the mounting bushing are arranged in the radial extension. The mounting bushing preferably lies exclusively via the at least one sliding part and thus not directly on the housing. The first sliding part is particularly preferably arranged, in particular exclusively, in a first section of the mounting channel formed by the first housing part. The second sliding part is particularly preferably arranged, in particular exclusively, in a second section of the mounting channel formed by the second housing part. The mounting channel preferably consists of the two sections.

[0014] Generally, the sliding elements preferably enclose the longitudinal axis of the feedthrough with an enclosing angle of at least 220°, in particular at least 240°, in particular at least 260°. Generally, the feedthrough preferably completely encloses the longitudinal axis perpendicular to the longitudinal direction over an angular range of at least 220°, in particular at least 240°, in particular at least 260°. Particularly preferably, the feedthrough has a longitudinally continuous opening on a side facing perpendicular to the longitudinal direction. The sliding elements preferably have a longitudinally continuous opening aligned with the opening of the feedthrough.The opening provided in the bushing and in particular the sliding elements serves to allow a web, via which the cylindrical guide section of the rail is connected to a rail body of the rail, to slide through the opening, while the bearing is slidably displaced along the longitudinal direction on the guide section of the rail.

[0015] Generally, the sliding elements preferably have grooves running in the longitudinal direction. This can prevent increased friction due to contamination, and the contact surface over which the sliding elements rest against the guide section can thus advantageously be kept small. Generally, the roller axes preferably run parallel to the mounting axis. Generally, the sliding elements are preferably made of a tribological polymer. The sliding parts are preferably made of a tribological polymer. Such a tribological polymer is a polymer optimized with regard to wear reduction and friction reduction. Such a tribological polymer usually has a base polymer, for example the thermoplastics polyethylene, polypropylene, polyacetal, polycarbonate, polyamide, polyvinyl chloride, polytetrafluoroethylene, and, in the case of thermosets, phenolic resins.Fine-particle solid lubricants, for example molybdenum disulfide or graphite, and / or fillers, for example plastic or textile fibers or particles, are added to this base polymer. The housing is preferably made of a metal or a metal alloy, in particular by die casting. The housing and thus the feedthrough preferably has a longitudinal extension of at least 6 cm, in particular between 6 cm and 15 cm. The rollers preferably have a diameter of 10 mm to 30 mm, in particular between 15 mm and 25 mm. The rollers are preferably made of a plastic. The roller axles are preferably made as a separate pin element fixed in the housing, particularly preferably from metal or a metal alloy. The housing is generally preferably made of aluminum.

[0016] The invention further relates to a bearing arrangement with a bearing according to the invention and with a rail which has a guide section designed in the manner of a cylinder. In the bearing arrangement according to the invention, the guide section is arranged so as to be displaceable in the longitudinal direction in the passage of the bearing, in particular in the receiving channel of the bearing located in the passage, and rests perpendicular to the longitudinal direction on both rollers. The guide section is preferably spaced from the sliding elements perpendicular to the longitudinal direction by less than 1 mm, in particular less than 0.5 mm, in particular less than 0.2 mm. Particularly preferably, the rail has a rail body and a web connected to the rail body, which is connected to the guide section and thus connects the guide section to the rail body. The web preferably runs continuously in the longitudinal direction over the longitudinal extent of the rail.The guide section is preferably designed in the manner of a cylinder with a circular or oval cross-section, on one side of which the web is attached, which connects the guide section to the rail body. The rail, comprising the rail body, web, and guide section, is preferably manufactured in one piece, in particular from aluminum, in particular by extrusion. Particularly preferably, the bearing arrangement comprises a further bearing according to the invention, so that it comprises two bearings according to the invention, in particular exactly two bearings according to the invention. The bearings are arranged side by side in the longitudinal direction and preferably spaced apart from one another in the longitudinal direction.The guide section of the rail is arranged in the passages, in particular in the receiving channels, of the two bearings, and the bearings are each fastened to a structural element by means of a mounting bolt arranged in their respective mounting channel and / or a mounting bushing arranged in their respective mounting channel. The structural element can be, for example, a machine part, such as the supporting frame of a machine, or a part of a building, such as a wall.

[0017] The invention further relates to the use of a bearing according to the invention, wherein a mounting bolt and / or a mounting bushing is guided through the channel and is fixed in a fixed position relative to the housing of the bearing, in particular with respect to the longitudinal direction and / or the transverse direction running parallel to the mounting axis and / or a direction running perpendicular to the mounting axis and the longitudinal axis, and at the same time is fixed so as to be rotatable about the mounting axis. The fixed position thus prevents translation relative to the housing, but not rotation. Preferably, a mounting bushing is arranged in the mounting channel, into which a mounting bolt is inserted and fastened to the mounting bushing at both ends thereof, such that the mounting bolt and mounting bushing are connected to one another in a fixed position and in a rotationally fixed manner, while the housing is mounted so as to be rotatable about the mounting bushing.When used according to the invention, a guide section of a rail, designed in the manner of a cylinder, is inserted along the longitudinal direction into the receiving channel so as to bear against the rollers, while the rollers rotate about their roller axes. Particularly preferably, the bearing is then displaced relative to the rail along the longitudinal direction, a force being applied between the bearing and the rail, by means of which force the bearing is rotated about the mounting bolt and / or the mounting bushing and the guide section is pressed against at least one of the sliding elements and slides along it in the longitudinal direction while being pressed against it, while at the same time it bears against at least one of the rollers and this one roller rotates about its roller axis. The force preferably has a force component in the longitudinal direction and a force component perpendicular to the transverse direction of this roller.

[0018] The invention is explained in more detail below with reference to three figures using an exemplary embodiment.

[0019] They show: Figure 1: in various schematic principle representations, various views of an embodiment of a bearing arrangement according to the invention; Figure 2: in various schematic principle representations, various views of components of the bearing arrangement according to the invention according to Figure 1 ; Figure 3: in a schematic exploded view the bearing of the bearing arrangement according to the invention according to Figure 1 .

[0020] In Figure 1 comprehensively the Figures 1a, 1b and 1cVarious views of an embodiment of a bearing arrangement according to the invention are shown in various schematic principle representations. The bearing arrangement comprises a bearing 1 and a rail 6. The bearing 1 comprises a first housing part 2 and a second housing part 3. The first and second housing parts 2, 3 together form the housing of the bearing 1. The housing has a passage extending through the housing along a longitudinal axis X. In the passage, a guide section 61 of the rail 6, designed in the manner of a cylinder, is arranged, which is connected to a rail body 62 of the rail 6 via a web. The passage with the guide section 61 received therein is shown in plan view along the longitudinal direction according to Figure 1b and from the sectional drawing perpendicular to the longitudinal direction according to Figure 1ccan be seen. The feedthrough encloses the longitudinal axis X perpendicular to the longitudinal direction over an angular range of approximately 260° without interruption. On a side facing perpendicular to the longitudinal direction, the feedthrough has a longitudinally continuous opening through which the web extends, via which the guide section 61 is connected to the rail body 62. This opening corresponds to the angular range in which the feedthrough does not enclose the longitudinal axis X. The housing parts 2, 3 further form a mounting channel which extends in the manner of a cylinder along a mounting axis Y. A mounting bushing 4 is arranged in this mounting channel, which is fixed in a fixed position relative to the housing parts 2, 3 with respect to the longitudinal direction due to its arrangement in the mounting channel, but is rotatable about the mounting axis Y relative to the housing parts 2, 3.The mounting bushing 4 has a hollow cylindrical casing part 42, on the radial outer side of which a circumferentially extending projection 41 in the form of a flange is formed, which is generally advantageous according to the invention. The mounting channel has a radial extension delimited on both sides along the mounting axis Y, in which the projection 41 of the mounting bushing 4 is arranged, so that the mounting bushing 4 is fixed in its position along the mounting axis Y relative to the housing parts 2, 3. Furthermore, a first sliding part 24 and a second sliding part 34 are provided, each having a sliding part projection with which they engage in the radial extension of the mounting channel, so that the sliding parts 24, 34 are also held in a fixed position relative to the housing parts 2, 3 with respect to the mounting axis Y.The radial extension of the mounting channel is a continuous radial extension along the mounting axis Y, in which both the projection 41 of the mounting bushing 4 and the sliding part projections of the sliding parts 24, 34 are arranged. The two housing parts 2, 3 each form a section of the mounting channel and, at their transverse ends facing each other along the mounting axis Y, each form a section of the radial extension of the mounting channel. The housing parts 2, 3 are arranged next to each other along the mounting axis Y and are releasably fixed to each other by screws 5 with their transverse ends facing each other. Due to this design of the bearing 1, the bearing 1 can be assembled particularly easily and, in particular, can also be maintained, for example to replace sliding parts 24, 34 or to replace a sliding element 7 located in the feedthrough, which slides against both the guide section 61 and the feedthrough.

[0021] In Figure 2comprehensively the Figures 2a and 2b are different views of components of the bearing arrangement according to Figure 1 shown schematically in various principle diagrams. Figure 2a shows the bearing arrangement according to Figure 1 without the second housing part 3. Figure 2b shows a view of a section BB perpendicular to the assembly axis Y of the Figure 2a shown assembly. Furthermore, Figure 3 Bearing 1 of the bearing arrangement according to Figure 1 shown schematically in an exploded view. The design and function of the bearing 1 is particularly evident from the overview of the Figures 2a , 2b and 3visible. The bearing 1 has two rollers 8, each of which is mounted in the housing so as to be rotatable about a roller axis 9. The roller axis 9 of both rollers 8 runs parallel to the mounting axis Y and is received in a blind hole in both housing parts 2, 3. In the described embodiment, the roller axes 9 are designed as separate pin elements fixed in the housing. Both roller axes 9 and thus also both rollers 8 are spaced from the mounting channel by the same distance along the longitudinal axis X and, with respect to the longitudinal direction, lie on two different sides of the mounting channel and thus also of the mounting bushing 4. In each longitudinal end section of the bushing, a sliding element 7 is provided, which encloses the longitudinal axis X with an enclosing angle of approximately 260°. In the Figure 2bIn the intended use shown, the cylindrical guide section 61 of the rail 6 rests against the running surfaces of both rollers 8 as well as against the sliding elements 7. This is generally advantageous according to the invention. The sliding elements 7 and the rollers 8 delimit the receiving channel formed in the passage, in which the guide section 61 is received, in a transverse direction that is perpendicular to the longitudinal axis X and the mounting axis Y. This transverse direction corresponds to the main load direction of the bearing 1, wherein the transverse direction is perpendicular to the roller axes 9 and the mounting axis Y, which run parallel to one another and perpendicular to the longitudinal axis X, which is generally advantageous according to the invention.

[0022] From a view of the figures together, it can also be seen that the mounting bushing 4 is in contact exclusively with the housing parts 2, 3 via sliding parts 24, 34 and thus not directly with the housing parts 2, 3. This ensures that the mounting bushing 4 can be rotated with as little friction as possible relative to the housing parts 2, 3. The provision of the sliding elements 7 and the rollers 8 also ensures a particularly resilient and low-friction mounting of the guide section 61 of the rail in the bearing 1, which can be displaced along the longitudinal axis X. The sliding parts 24, 34 and the sliding elements 7 are each made of tribological polymer. Figures 2b and 3It is further apparent that the two housing parts 2, 3 together form a roller cavity for each of the rollers 8, in which the respective roller 8 is received. Each of the housing parts 2, 3 forms a boundary of the respective roller cavity along the mounting axis Y, so that the roller 8 is fixed in its position relative to the housing with respect to the mounting axis Y in the respective roller cavity. Particularly preferably, and realized in the present exemplary embodiment, the rollers 8 are received with more than 50%, preferably more than 70% of their running surfaces in the respective roller cavity and extend with their running surfaces out of the respective roller cavity into the passage of the housing. The provision of corresponding roller cavities is generally advantageous according to the invention. List of reference symbols

[0023] 1 Bearing 2 First housing part 3 Second housing part 4 Mounting bush 5 Screw 6 Rail 7 Sliding element 8 Roller 9 Roller axis 24 First sliding part 34 Second sliding part 41 Projection 61 Guide section 62 Rail body XLongitudinal axis YMounting axis

Claims

1. Bearing (1) for a longitudinally movably guided roller-based and sliding element-based support of a cylindrical guide section (61) of a rail (6) which extends with its cylinder axis in the longitudinal direction, the bearing (1) comprising a housing which has a passage extending through the housing along a longitudinal axis (X) running in the longitudinal direction in which a receiving channel is formed for receiving the guide section (61) of the rail (6), wherein i) the bearing (1) has two rollers (8) spaced apart from each other in the longitudinal direction which are each rotatably mounted in the housing about a roller axis (9) extending perpendicularly to the longitudinal direction and each delimit with their running surfaces the receiving channel in a transverse direction extending perpendicular to their roller axis (9), characterized in that ii) the housing has a mounting channel in the longitudinal direction between the rollers (8), which channel extends perpendicularly to the longitudinal direction along a mounting axis (Y) and through the housing for receiving a mounting bolt and / or a mounting bushing rotatable about the mounting axis (Y), and iii) several sliding elements (7) are arranged in the passage at a distance from one another in the longitudinal direction and offset relative to the rollers (8), each of which delimits the receiving channel with one of its sides perpendicular to the longitudinal direction.

2. Bearing (1) according to claim 1, characterized in that the bearing (1) has a mounting bushing (4) rotatably mounted in the mounting channel, which mounting bushing protrudes beyond the housing on at least one side, in particular along the mounting axis (Y).

3. Bearing (1) according to any one of the preceding claims, characterized in that the housing comprises a first and a second housing part (2, 3) which are arranged next to each other along the mounting axis (Y) and are detachably fixed to each other.

4. Bearing (1) according to any one of the preceding claims, characterized in that the mounting channel is equidistant from both rollers (8) in the longitudinal direction and, in particular, is arranged on the same side of the receiving channel as the roller axes (9).

5. Bearing (1) according to any one of the preceding claims, characterized in that at least one sliding element (7) is arranged in a longitudinal end section of the passage and, in particular, is arranged closer to an absolute longitudinal end of the housing assigned to it than the roller (8) closest to it in the longitudinal direction.

6. Bearing (1) according to any one of the preceding claims, characterized in that the running surfaces of the rollers (8) have a concave contour facing the receiving channel, in particular a cross-section perpendicular to the longitudinal direction which is designed in the manner of a spherical section.

7. Bearing (1) according to any one of claims 2 to 6, characterized in that the mounting bushing (4) has a radial projection (41) on its outer side, which projection is designed in particular as a flange that is arranged in a radial expansion which is bounded within the housing on both sides along the mounting axis (Y), for fixing a position of the mounting bushing (4) relative to the housing, wherein, in particular, the expansion of the mounting channel is formed by transverse ends of the two housing parts (2, 3) facing each other along the mounting axis (Y).

8. Bearing (1) according to any one of claims 2 to 7, characterized in that a first, in particular hollow-cylindrical sliding part (24) is provided in the mounting channel between the housing and the mounting bushing (4), wherein, in particular, the first sliding part (24) has a first sliding part projection with which it is arranged in a first section of the extension of the mounting channel to define a position of the first sliding part (24) relative to the housing along the mounting axis (Y), wherein, in particular, a second sliding part (34) is provided in the mounting channel along the mounting axis (Y) offset from the first sliding part (24), which in particular has a second sliding part projection with which it is arranged in a second section of the extension of the mounting channel to define a position of the second sliding part (34) relative to the housing along the mounting axis (Y).

9. Bearing (1) according to claims 3 and 8, characterized in that the first sliding part (24) is arranged in a first section of the mounting channel formed by the first housing part (2) and the second sliding part (34) is arranged in a second section of the mounting channel formed by the second housing part (3).

10. Bearing (1) according to any one of the preceding claims, characterized in that the sliding elements (7) enclose the longitudinal axis of the passage at an enclosing angle of at least 220°, in particular at least 240°.

11. Bearing (1) according to any one of the preceding claims, characterized in that the passage completely encloses the longitudinal axis (X) perpendicular to the longitudinal direction over an angle range of at least 220°, in particular at least 240°, and has a continuous opening extending in the longitudinal direction on a side facing perpendicular to the longitudinal direction.

12. Bearing (1) according to any one of the preceding claims, characterized in that the sliding elements (7) have grooves extending in the longitudinal direction.

13. Bearing (1) according to any one of the preceding claims, characterized in that the roller axes (9) run parallel to the mounting axis (Y).

14. Bearing according to any one of the preceding claims, characterized in that the sliding elements (7) are made of a tribological polymer and / or the housing is made of a metal or a metal alloy, in particular by die casting.

15. Bearing arrangement comprising a bearing (1) according to one of the preceding claims and a rail with a guide section (61) designed in the manner of a cylinder, wherein the guide section (61) is arranged in the passage of the bearing (1) so as to be displaceable in the longitudinal direction and abuts against both rollers (8) perpendicular to the longitudinal direction and is spaced apart from the sliding elements (7) perpendicular to the longitudinal direction by less than 0.5 mm, in particular less than 0.2 mm.

16. Bearing arrangement according to claim 15, comprising a further bearing (1) according to one of claims 1 to 14, wherein the bearings (1) are arranged next to one another in the longitudinal direction and the guide section (61) is arranged in the passages of the two bearings (1) and the bearings (1) are each fastened to a component by means of a mounting bolt arranged in their respective mounting channel and / or a mounting bushing (4) arranged in their respective mounting channel.

17. Use of a bearing (1) according to any one of claims 1 to 14, wherein a mounting bolt and / or a mounting bushing (4) is guided through the mounting channel and is fixed in position relative to the housing of the bearing (1) and rotatable about the mounting axis, wherein a guide section (61) of a rail, which is designed in the manner of a cylinder, is inserted along the longitudinal direction into the receiving channel while resting against the rollers (8) while the rollers (8) are rotated about the roller axes (9).

18. Use according to claim 17, wherein the bearing (1) is then displaced relative to the rail along the longitudinal direction, thereby applying a force between the bearing (1) and the rail which causes the bearing (1) to rotate about the mounting bolt and / or the mounting bushing (4) and the guide section (61) to be pressed against at least one of the sliding elements (7) and to slide along the latter in the longitudinal direction while pressed against it, while at the same time bearing against at least one of the rollers (8) and this at least one roller (8) rotating about its roller axis (9).