DE10118873A1 - Linear guide has guide rails fixed to machine frame, bearing blocks, roller bodies, continuous tracks, and one-piece bearing block - Google Patents

Abstract

The carriage (6) is supported on rectangular sectioned guide rails (3) which are fixed to the machine-frame (5) by means of prismatic bearing blocks (4) fixed to the carriage, and by means of roller bodies (8,10,13). The roller bodies positioned between the bearing blocks and the guide-rails form continuous tracks each with a row of supporting roller bodies, a row of returning roller bodies, and two deflector rows joining the two previous rows. Each guide rail is partly enclosed on several of its four rectangular lengthwise sides by a one-piece bearing block.

Description

Field of the Invention

The invention relates to a linear guide with a carriage, which is along one Machine frame is movably arranged, wherein it is on the carriage fixed prismatic bearing blocks and rolling elements on in cross section in is supported essentially rectangular guide rails which on the Ma machine frame are attached, and being between the bearing blocks and Rolling elements arranged in a rollable manner on the guide rails are endless Rolling element revolutions, each with a row of load-bearing rolling elements, one row return rolling elements and two connecting these rows together Form deflection rows.

Background of the Invention

Such a linear guide, if it contains cylindrical rollers as rolling elements, also called roller circulation unit. It is used in the machine tool sector used. A problem with such known linear guides is as follows dem: If the guide rails with screws on the machine frame are attached, can move along the bearing blocks on the guide rails  and thus when driving over the edges of the guide rails drilled screw holes sealing strips of the bearing blocks who damaged the. To prevent this, it is known to attach the guide rails to the To provide sides of the screw holes with masking tapes, but this ei means additional effort.

For the majority of machine tools, it is desirable that a Linear guide to be installed has a large load rating with the smallest possible construction space and high rigidity. Your assembly should be simple and economical be inexpensive and it should enable high travel speeds. she should not have rail irregularities that are not due to a suitable one Assembly can be eliminated. The entire linear system should be featured can be delivered under tension. Its parts, such as guide rails, sledges and bearing blocks, but should also be able to be delivered separately without Having to accept disadvantages.

From Fig. 11 of German Offenlegungsschrift 21 29 024 a linear leadership tion of the type mentioned is known, in which a screwed to the machine alternate guide rail three horizontally arranged raceways for rolling elements of an upper bearing block and a vertically arranged raceway for rolling elements of a side Bearing blocks. The rolling elements are held on the bearing blocks in housings on which an opening in the direction of travel is formed for each row of supporting rolling elements. Through this, the rolling elements partially project outwards in order to be able to roll on the raceways of the guide rail. In this way, there is a large number of longitudinal slots between the housing and the guide rail, through which lubricant can escape from the bearing area and dirt particles can reach the bearing area from the outside.

Summary of the invention

The invention is based on the object of creating a linear guide which for many kilometers of sledge to be driven along the respective guide only a single amount of service life lubricant is required and where the entry of dirt into the storage area is difficult, so that the linear guide is insensitive to dirt.

This object is achieved in that each guide rail on several of their four rectangle long sides of a one-piece Bearing block is partially surrounded. Because the bearing block in one piece there are gaps between the adjacent bearings block parts avoided, over which the corresponding storage area of the line guide could be open to the outside or accessible from the outside. A Particularly favorable design results when each guide rail is surrounded on three long sides by the one-piece bearing block. In this Two longitudinal sealing strips are already sufficient for the lateral sealing. In order to close any gaps in the area of the returning rolling elements to the outside avoid which lubricant could leak out of the bearing block, can be used for the returning rolling elements of a rolling element circulation Return channel to be incorporated into the bearing block on its long sides is enclosed by the material of the bearing block. You can do it in one Return channel also arranged several rows of returning rolling elements his.

Brief description of the drawing

Embodiments of the invention are shown in the drawing and who described in more detail below. Show it

Figure 1 is a linear guide with a carriage, which is slidably mounted along two guide rails of a machine frame, in cross section.

FIG. 2 shows a linear guide with guide rails arranged rotated by 90 degrees with respect to FIG. 1, in a perspective view with a cross section.

Detailed description of the drawing

A linear guide according to the invention shown in Fig. 1 consists of egg nem machine frame 1 , a carriage 2 , two parallel, to the machine frame 1 screwed guide rails 3 and two bearing blocks 4 which are screwed to the carriage 2 . Correspondingly, the linear guide shown in FIG. 2 contains a machine frame 5 , a slide 6 , the two parallel guide rails 3 and the two bearing blocks 4 assigned to them.

The guide rails 3 contain screw holes 7 in the areas of their systems on the machine frame 1 or 5 . Screws, not shown, are used here, which are screwed into the machine frame 1 or 5 , as a result of which the guide rails 3 are fastened to the respective machine frame 1 or 5 . The bearing blocks 4 also contain Anschraubbohrun gene, in which screws, not shown, are inserted and screwed into the adjacent carriage 2 or 6 .

Each guide rail 3 is approximately rectangular in cross section. It protrudes from the machine frame 1 or 5 , to which it is screwed, three free long sides of the guide rail 3 being surrounded by the associated bearing block 4 in an approximately U-shape. The bearing block 4 has a corre sponding one-piece shape and contains a plurality of endless rolling element revolutions, whereby it is supported with rolling elements on the guide rail and can be displaced along the water. Each on the shorter corner of the guide rail 3 , the bearing block 4 is supported with rolling elements 8 , which are arranged in two par allelic endless rotations. For the return row of these rolling elements 8 , the bearing block 4 contains a return channel 9 . In Fig. 1, the rolling elements 8 are assigned to the free, shorter side of the rectangle of the guide rail 3 which is approximately rectangular in cross section. In relation to the approximately U-shaped bearing block 4 in cross section, the rolling bodies 8 are located on its web side. On the upper, longer rectangular side of the guide rail 3 , the rolling elements 10 of the bearing block 4 are supported and are located in the bearing block 4 in two parallel endless rotations, for which the bearing block 4 has a return channel 11 in its upper leg. On the underside, the guide rail 3 has a raceway 12 inclined relative to the rectangle side by an angle a. Here Wälzkör are supported by 13 of the bearing block 4 , which are arranged in an endless rolling element circulation on the lower leg of the bearing block 4 , for which purpose a return channel 14 is incorporated.

Fig. 2 shows an embodiment in which the two guide rails 3 with their large rectangular sides not horizontally, as on the machine frame 1 , son perpendicular to the machine frame 5 are screwed. Here, the guide rails 3 and the bearing blocks 4 surrounding them are arranged around the longitudinal direction of the guide rails 3 by 90 degrees. In a corresponding manner, the rolling elements 8 , 10 and 13 and the return channels 9 , 11 and 14 also assume a position rotated by 90 degrees.

The geometry of the guide rail 3 is designed such that its screw hole 7 lies outside the raceways for the rolling elements 8 , 10 and 13 . With this arrangement of the screw hole 7 , a secure and rigid connection to the machine frame 1 or 5 is created. The rolling bodies 8 and 10 are each arranged in pairs of rolling elements, while the rolling elements 13 each form only one revolution. The illustrated Wälzkör by 13 serve as a grip and as elements with which the necessary pretension for a prestressed system can be set. Accordingly, the size of the angle α of the raceway 12 for the rolling elements 13 , the bias between individual groups of rolling elements can be selected differently.

With the designs according to the invention the advantage is achieved that from cover tapes for screw holes in the guide rails or other closing of the screw holes is not necessary because the area of the guide rails 3 , in which the screw holes 7 be found, parts of the bearing block 4 not is touched.

LIST OF REFERENCE NUMBERS

1

machine frame

2

carriage

3

guide rail

4

bearing block

5

machine frame

6

carriage

7

screw-on

8th

rolling elements

9

Return channel

10

rolling elements

11

Return channel

12

career

13

rolling elements

14

Return channel

Claims (4)

1. Linear guide with a carriage ( 2 , 6 ) which is arranged to be movable along a machine frame ( 1 , 5 ), wherein it is prismatic bearing blocks ( 4 ) on the carriage ( 2 , 6 ) and via rolling elements ( 8 , 10 , 13 ) is supported on guide rails ( 3 ) which are essentially rectangular in cross section and are fastened to the machine frame ( 1 , 5 ), and the rolling elements ( 8 ) arranged between the bearing blocks ( 4 ) and the guide rails ( 3 ) can be rolled off , 10 , 13 ) form a plurality of endless rolling element revolutions, each with a row of load-bearing rolling elements ( 8 , 10 , 13 ), a row of returning rolling elements ( 8 , 10 , 13 ) and two deflecting rows connecting these rows, characterized in that each Füh tion rail ( 3 ) is partially surrounded on several of its four long sides by a one-piece bearing block ( 4 ). 2. Linear guide according to claim 1, characterized in that each Füh guide rail ( 3 ) on three of its four rectangular longitudinal sides of a one-piece bearing block ( 4 ) is partially surrounded. 3. Linear guide according to claim 1, characterized in that for the returning rolling elements ( 8 , 10 , 13 ) of a rolling element circulation in each case a return channel ( 9 , 11 , 14 ) is incorporated in the bearing block ( 4 ), which on al len its long sides of the material of the bearing block ( 4 ) is enclosed. 4. Linear guide according to claim 3, characterized in that in the bearing block ( 4 ) in a return channel ( 9 , 11 ) return several rows of the rolling elements ( 8 , 10 ) are arranged.