DE3527886A1 - Rolling-contact bearing for linear movements - Google Patents

Abstract

The invention proposes a rolling-contact bearing for linear movements in which two cage halves with end plates are inserted in the main body of the bearing. The end plates have ball redirection surfaces. The holding webs emanating from the end plates abut in a plane normal to the axis. The redirection of the balls takes place at redirection surfaces within the end plates. The holding webs are designed in such a way that in each case two mutually aligned holding webs emanating from mutually opposite end plates are sufficient to hold the load-transmitting ball rows of two sets of recirculating balls in a position of engagement with the respectively associated ball tracks in the main body of the bearing.

Description

The invention relates to a rolling bearing for linear movements, including one on a rail in its Bearing main body slidably guided in the axial direction with two spaced in the axial direction of the rail, in essential end faces normal to the axis and at least a pair of recirculating balls, each recirculating ball of the pair a straight, load-transferring row of balls in engagement with an axially parallel, load-bearing Groove of the bearing main body and with an axis parallel, load-bearing groove of the rail, one returning row of balls and two rows of arches points, further through the returning rows of balls approximately axially parallel return holes in the bearing  main body are guided, being further on the end faces End plates are attached, which deflection surfaces for have the rows of arches, with the end plates with one another in alignment and on theirs Ends of colliding axially parallel retaining webs are guided and with these holding bars the load load-bearing rows of balls in engagement with the load Secure the receiving grooves of the main bearing body.

Such rolling bearings with plastic cages (end plates + Half ridges) are known. In DE-OS 32 27 902 and DE-OS 31 48 331 describes a linear guide, their plastic, which is divided into two parts perpendicular to the axial plane cage each from an end plate with incorporated ball return recesses and five molded stops web exists. The disadvantage is the high number of Holding bars for guiding the four loaded balls rows that are a complicated and therefore uneconomical Lich injection mold and require a larger Draw material consumption. In addition, for the Ball deflection at the outlet or entry into the be ball races were burdened with larger fillets or ab bevels attached to the bearing main body, what a he considerable machining post-processing. Happens if not, then there is a sudden loading and Relief of the load-bearing balls with enormous edges pressing at the transition to the end plate. So that's the process impaired and the lifespan significantly reduced puts. In spite of rounding, the execution of DE-OS 32 27 902 the process is not satisfactory be, since the inner and outer turning radius no con form centric semicircles, causing discontinuities and different ball play in the deflection leads.  

In DE-OS 31 48 333, this defect is largely eliminated. Here, however, the problem remains, the external one Radius at the transition to the return hole in the main bearing continue body. This is manufacturing technology, though at all, very difficult to do. The return holes cannot be made by drilling. Around to enable lubrication of the linear bearing also machining by drilling a lubrication hole and several connecting channels in the main bearing body necessary (DE-OS 32 27 902). This causes additional costs and an increased expenditure of time in the manufacture of the bearing element. A seal is not scheduled. This can cause the lubricant very easy to escape and dirt in the bearing element penetrate so that the life is reduced.

With another linear bearing version in DE-OS 32 24 282 come with four molded cage stops there are three additional ones in the warehouse for two rows of balls main body to be screwed to add what a further complication of the storage unit results. in the the rest applies to what has been said for DE-OS 32 27 902.

From DE-OS 33 03 831 a ball bearing is knows with two plastic cage halves, whereby also post-processing on the main bearing body for the deflection as well as a complicated injection mold are and no relubrication and sealing possible are. The load capacity of this bearing element is also limited because the shaft does not support continuously can be. Furthermore, this version is not Can be screwed directly onto a flat contact surface  Base block, but a sleeve-like Ele ment that is received by a housing bore.

French publication 25 23 669 describes a cage for an open rail guide with two rows of balls. It can be made of metal or plastic and has features like the cages described above. End plate and ball guide for both tracks of the two cage halves are in one piece according to FIGS . 4 and 5. The ball deflection takes place in the end plate. A post-processing in order to achieve a good transition at the ball inlet or outlet and thus a low wear and quiet operation is necessary, whereby, as already described in DE-OS 32 27 902 and DE-OS 31 48 333, nevertheless, no satisfactory process can be achieved or the manufacture of the Endbe area "outer turning radius" in connection with the return hole brings considerable problems. Relubrication options and seals are also missing here.

However, there are also bearing elements for longitudinal guides known in which a major post-processing of the be no longer loaded raceway ends of the bearing main body is required and still a good ball transition and smooth ball running is achieved. In the DE-OSes 30 05 579, 14 25 966, 33 13 129, 33 04 895 and 33 13 575 this is achieved by means of semi-cylindrical deflection pieces, whose radius corresponds to half the ball diameter. The Deflection pieces are between the end plate and the end face of the Main bearing body inserted into recesses and guide so that the balls from the inside. The outer ball guide will from the well-known U-shaped recesses in the sides  plate taken over. All of these solutions have in their Embodiments of one thing in common: end plate with ball deflection and retaining bars are manufactured and assembled separately. There with increases the number of parts and thus the number of parts effort and assembly effort as well as the number of bumps transitions and sources of error.

The invention has for its object a rolling bearing Specify generic type, which is easily manufactured can be, the demand for lighter ferti supply, in particular with regard to the bearing main body and of the cage consisting of end plates and retaining bars consists.

To solve this problem, the invention provides hit that the two load transferring rows of balls both ball revolutions of the pair by a single one, them common group of two aligned, each Weil associated with an end plate and between the load transferring rows of balls arranged in webs Position of engagement with the respective groove of the bearing main body are secured.

In the embodiment according to the invention, which each have an end plate and a retaining web for cage parts each consisting of two recirculating balls easiest way by pouring or spraying in particular manufacture from plastic, whereby machining Bear processing either completely avoided or to a minimum is reduced.

Particularly advantageous for simple shapes and for one fold manufacture of the bearing main body and the cage  parts is when the load transferring rows of balls of the pair of ball revolutions on one side of one the axes of the two load-bearing rows of balls of the pair containing plane on the grooves of the Bear main body and on the other side this level with circumferential areas facing each other rest on the holding bars and with each other circumferential areas on the grooves of the rail.

To the balls on the bearing main body before closing Assemble the main bearing body with the rail To give good hold, it is suggested that the hold Web retaining grooves for the load transferring rows of balls exhibit.

To the holding bars in their position with respect to the camp main body clearly and immovably, it is proposed that the retaining webs be Spring connection, especially with dovetail profile, or a similar connection on the bearing main body are supported.

Around the holding bars, the opposite end plates belong to each other at the joints connect and the exact profile alignment of the holding bars ensure that it is mutually exclusive the ends of the retaining webs that are aligned with one another Plug connections or the like connected to each other are.

To in the bearing main body with only straight lines against grooves and return holes that can be easily manufactured, it is proposed that  the end faces of the bearing main body at the point the transition from the straight, load-bearing Rows of balls are arranged to the rows of arches and that the rows of arches each by a in a contact surface of the end plate recessed outer um steering surface and an inner deflection surface are guided, the latter being formed on a deflection piece can, which in a crossing the outer deflection surface Deflection piece receiving channel in the contact surface of the end plate is included. This type of design is also with a view to the simple manufacture of each because part consisting of end plate and retaining webs cages advantageous.

The balls are then running smoothly, when the rows of arcs follow a semicircle. This means that then the outer and inner order steering surfaces must have a concentric circular shape.

It is for simple and inexpensive manufacture with parallelism of the ball revolutions of a pair advantageous when the adjacent rows of arches of the Ball runs of the pair a common, semi-cylindrical Get redirection piece assigned, which by a common seed semicylindrical deflector receiving groove opened is taken.

Reliable lubrication of the rolling bearing, the same probably particularly small additional measures during production required, can be gained in that in the system area of at least one end plate of a lubricant care channel is provided, which to a lubricant middle inflow of the end plate is connected to the order  Steering piece receiving channel and through a lubricant teldistribution system within the deflector receptacle run one or two ball circulations with lubricant provided. If it is assumed that the end plate is cast or injected from plastic, so lets the lubricant supply channel at the casting or injection molding process, without you be special machining needs. It can the lubricant distribution system within the deflection piece receiving channel from a longitudinal distribution channel in one back surface remote from the inner deflection surface the deflection piece and a transverse bore are formed, which this longitudinal distribution channel with the inner deflection area of the respective row of arches connects. In order to the lubricant distribution system into the redirect piece, which is sprayed independently of the end plate pour can be made without rework.

The rolling bearing concept according to the invention can in particular use especially in rolling bearings where the bearing main body two opposite pairs of Orbits encompassing the rail between them record, tape. This results in a rail profile shape of approximately rectangular cross-section, with two in two depressions on the opposite side surfaces are arranged on the edges of the grooves of the Rail are attached, being between these Laufril len find the footbridges.

In terms of ease of manufacture, the Kugelum runs in the U-legs of the bearing main body with fore partly parallel to the U-web of the main bearing body  arranges.

In addition to the regular one-piece design of the Bearing main body is based on a new concept also conceivable that the opposite pairs of ball revolutions in parts of the bearing main body are housed, the mutual distance vari abel is. In this way, parts of bearings Manufacture main bodies as standard parts that are used for ver different rail widths at different distances can be arranged, either by corresponding connectors connected together be or directly individually on each leading machine parts can be attached. This out education is fundamentally independent of the invention appropriate design of the cage parts.

The track can also consist of two profile parts load-bearing grooves and with at least one Intermediate piece to be assembled; this results in the possibility of running rails of different widths to assemble from standard parts, in large pieces numbers can be manufactured accordingly cheap.

To prevent dirt from entering the sphere prevent circulation, for example of metal chips, if the bearing for guiding a carriage on a Machine tool is used, it is suggested that on the end plates on their from the main bearing End faces facing away from the body are brought, which one the profile of the rail at least on part of its scope little have at least approximately the following sealing edge. The  Sealing edge is of course designed so that they are as close as possible to the circumference of the profile Can nestle rail. To the sealing plate one to protect on the one hand and the pleasing on the other Appearance of the bearing main body and the end plates not to interfere with the sealing plates essentially in recesses in the end faces liche flush to the end faces.

With regard to easy assembly, the sealing can plates on the end plates by snap connections attach; the snap connections be designed like a push button and for example of interlocking C-profiles and bead profiles be educated.

In order to further seal the ball bearings tailoring, especially with regard to any Dirt penetration through mounting holes in the Rail, you can on the main body and given also on the end plates on both sides of the load bearing rows of balls of a pair of ball revolutions sealing strips parallel to the load-transferring rows of balls attach which slide against the rail.

If the bearing main body is U-shaped in cross section is educated and you face a stressful situation before, in which the web of the U cross-section of the Rail seems to stand out, this means Be load situation a spreading effect on the U-legs. The stability of the U-section against such spread effect can be improved by the fact that the U-web of the bearing main body a contact surface remote from the rail  for planting on a machine part and that U-bridge with the machine part through bolt connections or the like, which is both close to the U-legs as well as approximately in the middle between the U legs are arranged. For such an arrangement of bolt connections between the U-legs is the Design according to the invention particularly suitable because Cage parts in the area of the U-bridge are missing.

According to the invention, a linear guide is therefore included easy to manufacture bearing main body and an art fabric cage created that a clean ball deflection with smooth operation and low wear and at the same time the task of lubricant distribution and perceives the bearing seal. The ge Entire bearing element can be economically made from a few Build manufacturable parts without rework on Bearing main body for the ball deflection are necessary.

The invention is intended to be described in more detail with reference to the attached figures to be discribed. Show it:

Figure 1 is an overall view of the rolling bearing.

Figure 2a is an end view in half-section of the guide rail with integrated retaining webs.

FIG. 2b shows a side view of the rail guide;

. Fig. 2c shows the end view of FIG 2a of another embodiment;

Fig. 2d is a side view according to Figure 2b of the other embodiments.

Fig. 2e the load-transferring rows of balls in Ver enlargement;

Figure 3 is a view of the end plates, seen from the inside.

FIG. 4 shows the section IV-IV according to FIG. 3;

Fig. 5 is a view of the end plates, seen from the outside;

Fig. 6 is an enlargement of the retaining web according to VI in FIG. 3;

Fig. 7 is the magnification of the snap-in connection according to VII in Fig. 4;

Fig. 8 shows the section VIII-VIII of FIG. 3;

Fig. 9 the deflection piece in the installed state;

FIG. 9a is a section along line IX-IX a a of FIG. 9;

FIG. 10 is a side view of the flat side of the semi-cylindrical deflection piece;

FIG. 10a is a section X a -X a of FIG. 10;

FIG. 11 shows the top view of the deflection piece according to FIG. 10;

FIG. 12 is an external view of the sealing plate;

FIG. 13 is the section XIII-XIII of FIG. 12;

Fig. 14 shows a variant of the bearing element.

In Fig. 1, Fig. 2a and Fig. 2b, the inventive rail guide is shown as a storage unit. A main bearing body 1 with four ball revolutions A, B, C, D and thus axially extending, load-bearing rows of balls A 1 , B 1 ,. . . allows in conjunction with four grooves A 12 , B 12 , C 12 , D 12 incorporated into a rail 2 , the longitudinal movement of mutually displaceable parts, even with simultaneous action on the bearing main body 1 or the rail 2 with a torque. The returning rows of balls A 2 , B 2 are inside the bearing main body 1 in return bores A 21 , B 21,. . . guided so that four ball revolutions A, B, C, D with the load-transferring rows of balls A 1 , B 1 etc. and the returning rows of balls A 2 , B 2 etc. connect the rows of arches A 3 , B 3 etc. Two ball revolutions A, B; C, D lie on a plane that is perpendicular to the plane of symmetry SS of the bearing unit.

The mounting of the bearing main body 1 is carried out by bolt connections with through holes 15 , which are located in relation to the plane of symmetry SS in the outer region of the bearing main body 1 and in its symmetry plane SS , namely at 15 a . In another embodiment ( Fig. 2c, Fig. 2d) instead of the through holes 15 a threaded holes 16 , 16 a can be provided. The additional central fastening possibility of the main bearing body prevents its deflection with lateral and lifting loads and thus increases the rigidity of the bearing unit. The rail 2 is screwed through central holes 17 to the underground.

Fig. 3 and Fig. 4 show a half of the two-part in achsnor painter level plastic cage in the inner view and in section, consisting of the end plate 18 with contact surface 19 and two axially extending retaining webs 20 a , 20 b , together with the end plate 18 are integrally formed and have the task of the load-transmitting rows of balls A 1 , B 1 ,. . . to guide in the bearing main body 1 during the course of movement, ie by means of the retaining grooves A 14 , B 14 ,. . . to keep the bearing main body 1, namely before the assembly of the bearing main body 1 with the rail 2, in which then the load-transmitting rows of balls into engagement with the load-bearing raceway grooves A 12, B 12,. . . the rail 2 come; for this, reference is made to Fig. 2e, where the grooves on the running and holding A 11 , B 11 ,. . . ; A 12 , B 12,. . .; A 14 , B 14,. . . adjacent peripheral areas of the load-transferring rows of balls A 1 , B 1 ,. . . are designated by α , γ and β respectively. The angle sum α + β is greater than 180 °. This ensures that the balls are held securely in the bearing main body even outside of the rail. To avoid "drilling friction" in the area α 1 the contact of the balls with the main bearing body is interrupted by a slight recess. Friction of the balls on the retaining web 20 a , 20 b is prevented after assembly with the rail by corresponding play in the area β .

Four U-shaped recesses 22 in the end plate 18 form outer deflecting surfaces 22 a for the rows of arches A 3 , B 3 ,. . . The end plate 18 is housed within a recess which forms an end face 1 d of the bearing main body. In the end plate there are also semicylindrical deflecting piece receptacles 25 into which corresponding semicylindrical deflecting pieces 36 are placed during assembly. In continuation of the Umlenkstückaufnahme gutters 25 extends a lubricant supply channel 26 with a semi-cylindrical cross-section to the plane of symmetry SS of the end plate 18 , where a lubricating bore 27 with threaded connection ensures the supply of the four ball umlauts A, B, C, D with lubricant. The plastic cage halves 18 , 20 a , 20 b are attached to the bearing main body 1 of the bearing element via two bores 27 a in the end plate 18 of the cage. A recess 28 enables the integration of a sealing plate. The anchoring of the sealing plate 29 ge happens via a plurality of snap connections 30 , 39 ( Fig. 4, 7, 12, 13).

The integrated in the plastic cage sealing plate 29 ver prevents with its the profile of the rail 2 sealing edge 29 a leakage of lubricant and the ingress of dirt. Additionally inserted sealing strips 40 , 41 , which are attached directly above ( 40 ) or below ( 41 ) the load-transmitting rows of balls A 1 , B 1 in the bearing main body 1 , ensure that no dirt, which may be on the rail holes 17 in the bearing element 1 has entered, the balls or the contact zone with the rail 2 is reached. This enables an almost hermetic sealing of the Abwälzbe rich.

In Fig. 5, the recess 28 for receiving the sealing plate 29 and in Fig. 5, 7, 12 and 13, the position of the snap elements 30 , 39 is clear.

Fig. 6 shows the enlargement of a holding web 20 b ge according to FIG. 3. To guide the load-transmitting ball rows A 1 , B 1 , two holding grooves A 14 , B 14 are formed on the holding web 20 b . The retaining web 20 is secured against bending over its entire length by a spring 32 b , which engages in a corresponding groove 32 a in the main bearing body. In addition, the retaining webs 20 a , 20 b of the two cage halves are connected to one another by pins 33 a inserted into the bore 33 b .

Fig. 7 shows the structure of the C-profile 30 of the snap connection 39 with which the sealing plate 29 is fixed in the end plate 18 . Two arcuately curved tongues 34 together with a recess 35 form a C-profile. A correspondingly shaped bead profile 39 ( Fig. 13) on the sealing plate 29 is snapped into the C-profile by the elastic tongues 34 are bent wegge.

In Fig. 8 the section VIII-VIII according to FIG. 3 is provided. The course U-shaped, symmetrical lubricant supply channel 26 (see Fig. 3) has a semicircular cross section.

The shown in Fig. 9, 9a, 10, 10a and 11 semi-cylindrical deflector 36 has on its planar rear side 36 b a longitudinal distribution channel 26 a as a continuation of said lubricant supply channel 26 with the same semicircular cross section. Two transverse bores 37 in the deflection piece 36 connect the longitudinal distribution channel 26 a to the rows of arches A 3 , B 3 ,. . .; these cross bores 37 penetrate the formed on the deflection pieces 36 inner deflection surfaces 36 a . The inner deflection surface 36 a takes over the inner guidance of the arc rows of balls A 3 , B 3 ,. . . and ensures a smooth ball run.

In Fig. 9 it can be seen that the center of the holes of the transverse bores 37 of the inner deflection piece 36 according to Fig. 10, 10a and 11 are not on the center distance of the two recesses 22 , but are closer together. This is because the transverse bores 37 should not interfere with the ball flow in the area of the inner deflection surface 36 a . In order to achieve the same effect, they could of course also be placed far apart.

Fig. 12 and Fig. 13 show the outer and inner contour of the sealing plate 29 and the shape of the sealing lip 29 a . The fastening of the sealing plate 29 takes place via the snap connections, which integrate the sealing plate 29 into the plastic cage half 18 , 20 a , 20 b .

In Fig. 14 an expansion of the possible uses of the bearing element is shown. For special A construction cases, it may be advantageous to divide the bearing main body 1 to z. B. to allow the installation of a wider rail 2 . Due to the location of the ball revolutions and the resulting cage construction with only one group of aligned retaining webs 20 a , 20 b for two load-transferring rows of balls, it is possible to divide the bearing main body and the cage with relatively little effort along the plane of symmetry SS . The seal remains intact. Only the lubricant supply must be changed so that both parts 40 a , 40 b of the main bearing body 1 created by the cut can be lubricated individually. If the rail 2 is also divided, namely into two profile parts 42 a and 42 b and an intermediate piece 42 c , then the area of use of the bearing increases still further. In principle, longitudinal guides of any width can be realized. The intermediate piece 42 c is dimensioned accordingly.

Claims (24)

1. Rolling bearing for linear movements, comprising a on a rail ( 2 ) displaceably guided in the axial direction of the bearing main body ( 1 ) with two in the axial direction of the rail ( 2 ) spaced, in union union normal end faces ( 1 d) and at least one pair of ball revolutions (A, B) ,
wherein each ball circulation (A, B) of the pair a straight-line, load-transmitting row of balls ( A 1 , B 1 ) in a handle with an axially parallel, load-bearing groove ( A 11 , B 11 ) of the bearing main body ( 1 ) and with an axially parallel, load-bearing Has groove ( A 12 , B 12 ) of the rail ( 2 ), a returning row of balls ( A 2 , B 2 ) and two rows of curved balls ( A 3 , B 3 ),
wherein the returning rows of balls ( A 2 , B 2 ) are guided through return bores ( A 21 , B 21 ) in the bearing main body ( 1 ) which are approximately axially parallel,
end plates ( 18 ), which have deflection surfaces ( 22 a) for the rows of arches ( A 3 , B 3 ), are further attached to the end faces ( 1 d) ,
wherein the end plates ( 18 ) are designed with axially parallel holding webs ( 20 a , 20 b ) lying in alignment with one another and colliding at their ends and
these retaining webs ( 20 a , 20 b ) the load-transferring rows of balls (A 1 , B 1 ) in the engagement position to the load-bearing grooves ( A 11 , B 11 ) of the bearing main body ( 1 ), characterized in that the two load-transmitting rows of balls ( A 1 , B 1 ) both ball revolutions (A, B) of the pair by a single, common group of two aligned, each one end plate ( 18 ) associated and arranged between the load-transmitting rows of balls retaining webs ( 20 a , 20 b ) are secured in the engaged position to the respective groove ( A 11 , B 11 ) of the bearing main body ( 1 ). 2. Rolling bearing according to claim 1, characterized in that the load-transmitting rows of balls ( A 1 , B 1 ) of the pair of ball revolutions (A, B) on one side (peripheral region α ) one of the axes ( A 13 , B 13 ) of the two load-transmitting rows of balls ( A 1 , B 1 ) of the pair (A, B) containing plane (PP) on the running grooves ( A 11 , B 11 ) of the bearing main body ( 1 ) and on the other side of this plane (PP) with each other facing circumferential areas ( β ) bear against the retaining webs ( 20 a , 20 b ) and bear against the grooves ( A 12 , B 12 ) of the rail ( 2 ) with circumferential areas ( γ ) remote from one another. 3. Rolling bearing according to claim 2, characterized in that the retaining webs ( 20 a , 20 b ) retaining grooves ( A 14 , B 14 ) for the load-transmitting rows of balls ( A 1 , B 1 ). 4. Rolling bearing according to one of claims 1 to 3, characterized in that the retaining webs ( 20 a , 20 b ) by a tongue and groove connection ( 32 a , 32 b ), in particular with a dovetail profile, or the like in the bearing main body ( 1 ) are. 5. Rolling bearing according to one of claims 1 to 4, characterized in that the mutually facing ends of mutually aligned holding webs ( 20 a , 20 b ) are connected to one another by plug connections ( 33 a , 33 b ) or the like. 6. Rolling bearing according to one of claims 1 to 5, characterized in that the end faces ( 1 d) at the point of transition from the straight, load-transferring rows of balls ( A 1 , B 1 ) to the arc ball rows ( A 3 , B 3rd ) are arranged and that the arc rows of balls ( A 3 , B 3 ) each through an in a bearing surface ( 19 ) of the end plate ( 18 ) recessed outer deflecting surface ( 22 a) and an inner deflecting surface ( 36 a) are guided, wherein the latter ( 36 a) is formed on a deflecting piece ( 36 ) which is received in an outer deflecting surface ( 22 a) crossing the steering piece receiving groove ( 25 ) in the contact surface ( 19 ) of the end plate ( 18 ). 7. Rolling bearing according to claim 6, characterized in that the row of curved balls ( A 3 , B 3 ) follows a semicircle. 8. Rolling bearing according to one of claims 1 to 7, characterized in that the ball revolutions (A, B) of the pair are arranged in two mutually parallel planes on the bearing main body ( 1 ). 9. Rolling bearing according to claim 8, characterized in that adjacent rows of balls ( A 3 , B 3 ) of the ball revolutions ( A , B) of the pair is assigned a common semi-cylindrical deflection piece ( 36 ) which is received by a common semi-cylindrical deflection piece receiving channel ( 25 ) is. 10. Rolling bearing in particular according to one of claims 6 to 9, characterized in that in the system surface ( 19 ) at least one end plate ( 18 ) a lubricant supply channel ( 26 ) is provided which on a lubricant inflow ( 27 ) of the end plate ( 18 ) is connected to the deflection piece receiver channel (25) leads and through a telverteilungssystem Schmiermit (26 a, 37) at least provided within the order deflection piece receiver trough (25), a ball screw (a, B) with lubricant. 11. Rolling bearing according to claim 10, characterized in that the lubricant distribution system ( 26 a , 37 ) comprises a longitudinal distribution channel ( 26 a) in a remote from the inner deflection surface back surface ( 36 b) of the deflection piece ( 36 ) and a transverse bore ( 37 ) which connects this longitudinal distribution channel ( 26 a) with the inner deflection surface ( 36 a) of the respective arc ball row ( A 3 , B 3 ). 12. Rolling bearing according to one of claims 1 to 11, characterized in that the bearing main body ( 1 ) comprises two opposing pairs (A, B; C, D) of ball revolutions (A, B, C, D) , which between them Take up the rail ( 2 ). 13. Rolling bearing according to claim 12, characterized in that the bearing main body ( 1 ) engages around the rail ( 2 ) in a U-shaped manner, the ball circulations (A, B, C, D) in the U-legs ( 1 a) of the bearing main body ( 1 ) are brought under. 14. Rolling bearing according to claim 13, characterized in that the ball revolutions (A, B, C, D) in the U-legs ( 1 a) of the bearing main body ( 1 ) parallel to the U-web ( 1 b) of the bearing main body ( 1 ) are arranged. 15. Rolling bearing according to one of claims 12 to 14, characterized in that the opposing pairs (A, B; C, D) of ball revolutions (A, B, C, D) in parts ( 40 a , 40 b ) of Main bearing body ( 1 ) are housed and their mutual distance is variable. 16. Rolling bearing according to one of claims 12 to 15, characterized in that the running rail ( 2 ) from two profile parts ( 42 a , 42 b ), with load-bearing grooves and at least one intermediate piece ( 42 c) is composed. 17. Rolling bearing according to one of claims 1 to 16, characterized in that on the end plates ( 18 ) on which of the bearing main body ( 1 ) from facing end faces ( 19 a) sealing plates ( 29 ) are brought, which one the profile of the rail ( 2 ) have at least part of its circumference at least approximately the following sealing edge ( 29 a) . 18. Rolling bearing according to claim 17, characterized in that the sealing plates ( 29 ) in recesses ( 28 ) of the end faces ( 19 a) are received substantially flush with them. 19. Rolling bearing according to claim 17 or 18, characterized in that the sealing plates ( 29 ) on the end plates ( 18 ) by snap connections ( 30 , 39 ) are fastened. 20. Rolling bearing according to claim 19, characterized in that the snap connections ( 30 , 39 ) are designed like a push button. 21. Rolling bearing according to claim 20, characterized in that the push-button-like snap connections of interlocking C-profiles ( 30 ) and Wulstpro files ( 39 ) are formed. 22. Rolling bearing according to one of claims 1 to 21, characterized in that on the main bearing body by ( 1 ) and optionally also on the end plates ( 18 ) on both sides of the load-transmitting rows of balls ( A 1 , B 1 ) of a pair of ball revolutions (A, B ) to the load-transmitting rows of balls ( A 1 , B 1 ) parallel sealing strips ( 40 , 41 ) are attached, which rest on the rail ( 2 ). 23. Rolling bearing according to one of claims 13 and 14, characterized in that the U-web ( 1 b) of the bearing main body ( 1 ) has a rail-remote contact surface ( 1 c) for bearing on a machine part and that the U-web ( 1 b) with the machine part is connected by bolt connections ( 15 , 15 a ) or the same, which are arranged near the U-legs ( 1 a) and also approximately centrally between them. 24. Rolling bearing according to one of claims 11 to 23, characterized in that the mouth of the transverse bore ( 37 ) in the inner deflection surface ( 36 a) is offset relative to a plane containing the ball centers of the respective arc row of balls.