DE102005054516B3 - Linear bearing for a rolling body has bearing parts sliding relative to each other in a translational direction with grooves each to receive a slide-way plate with slide-ways for rolling bodies - Google Patents

Abstract

A slide-way plate (6) consists of a section of a profiled rod. Translational travel in a rolling body (10) on the slide-way plate is limited by an end impact point (11) located on an axial end of the slide-way plate. The end impact point consists of a further cut-off piece of the profiled rod inserted into a groove (4) so that travel in the rolling body is limited.

Description

The The invention relates to a linear bearing, the two relative to each other has translationally displaceable bearing parts, wherein each bearing part has at least one groove into which a track plate with at least a career for Rolling used is, wherein the race plate of a section of a profile bar and wherein the translational displacement at least a rolling element on at least a raceway plate through at least one at the axial end the raceway located end stop is limited.

linear bearings This type are well known in the art. Often exist the relatively displaceable bearing parts made of light metal, which do not have high strength. Thus for the start of the rolling elements, mostly Balls, a durable contact surface available is, are incorporated in the bearing parts grooves in the raceway plates or track rails made of steel. The track plate has a shape corresponding to the rolling element Career on. So that the track plate is firmly seated in the bearing part, are the width of the groove and that of the raceway plate with press fit tolerated to each other. After pressing in the raceway plate in the groove is fixed relative to the bearing part.

It is also known to provide a stop at the axial ends of the raceway plate, so that the rolling elements and the bearing parts or raceway plates are not disengaged. Without a stop, there is a risk that in this type of linear bearings - in contrast to linear bearings with recirculating ball elements (see, for example, the DE 40 15 124 A1 ) - The one bearing part expires at too large translational displacement of the other bearing part and the bearing components fall apart.

From the EP 0 665 383 A1 is a linear bearing with a telescopic rail made of extruded aluminum sections known in which an outer part and an inner part via interposed balls are mutually displaceable. It is intended to use as raceways for the balls per row of balls four extending in the direction of displacement rods circular cross-section in the aluminum profiles. To limit the translational travel of the linear bearing two stop pins are arranged with circular cross-section in each ball track at a distance from each other.

From the EP 1 188 941 A1 and from US 2004/0234179 A1 solutions are known in which the linear guide are provided with guided in a cage balls, wherein the linear guide comprises a linear movement limiting stop plate. This stop plate forms a stop for the cage, so that the maximum relative displacement is limited.

The previously known solutions suffer from the disadvantage that the travel limit of the translational displacement of the linear bearing is relatively complicated to accomplish. Both the stop pins according to the EP 0 665 383 A1 as well as the stop plates according to the EP 1 188 941 A1 or US 2004/0234179 A1 require a relatively high manufacturing and assembly costs, which can be the cost of a generic linear bearing correspondingly high.

Of the Invention is therefore based on the object, a linear bearing of the above-mentioned type so that it becomes possible to to achieve a limitation of the translatory displacement, without it costly measures to take. In particular, the assembly of the linear bearing should make it very easy.

The solution this object by the invention is characterized in that the at least one end stop from another cut off Piece of the Profilstabes consists of which also consists of the raceway plate, wherein this part is inserted into the groove so that the displaceability of the Limited rolling elements is.

Prefers is provided that at least in both axial end portions a raceway plate each an end stop is arranged. Further the end stop is preferred relative to the track plate in the longitudinal direction of the profile bar rotated by 180 ° arranged.

According to the invention is thus provided that short pieces the profile bar, which also makes the raceway plate used be a stop for at least one rolling element to create. This piece is "wrong around "into the groove pressed, so that the rolling elements at most can run up to this stop on the track plate, causing the linear bearing cover only a defined maximum displacement can.

Advantageously, the raceway plate has a rectangular shape in cross-section. This is to be understood that the raceway plate - apart from the usually ground raceway for the rolling elements - has a substantially rectangular cross-section, the corners are preferably rounded. The width of the raceway plate is preferably at least twice as large like the (maximum) thickness of the plate.

The Width of the raceway plate is preferably slightly larger than the width of the groove, so that the race plate is press-fitted in the groove and so that it can be easily mounted by pressing and after assembly safely seated in the bearing part.

A others and in some cases preferred approach to the arrangement of the raceway plates in the for They provided groove is that clearance between the Width of the raceway plate and the groove is provided and the raceway plate first is loosely placed in the groove. Subsequently, by material displacement - for example by caulking at single points or on the entire length of the Track plate by rolling - a Fixing the raceway plate in the groove.

Of the Profile bar is preferably made of steel, in particular of an extruded Material. The surfaces the profile bar are preferably hardened.

Especially are preferred as rolling elements balls used. The rolling elements can of a cage guided become. A special embodiment provides that a number of balls in the longitudinal direction of the profile bar next to each other in the cage is arranged.

With the invention proposal is a very cost-effective way created a linear bearing with an end stop for to create the rolling elements.

Especially economical does it affect that no additional parts are needed for the end stop, something regularly too corresponding tooling costs. Furthermore, the constructive Reduced effort for the design of the warehouse is required. Furthermore, the logistics and disposition of part handling for the linear bearing improved, because fewer different parts are required to the linear bearing and in particular to realize its attack.

The Mounting is also greatly simplified as an additional Operation for the installation of the stop is saving. The manufacture and insertion the limiting pieces according to the invention in a very simple way possible.

In the drawing is an embodiment of Invention shown. Show it:

1 in three-dimensional view, a linear bearing with taken away second bearing part and

2 the view of the linear bearing viewed in the direction of displacement.

In the figures is a linear bearing 1 to see, the two relative to each other translationally displaceable bearing parts 2 . 3 having. The translatory displacement direction is indicated by L. The bearing parts 2 . 3 consist of light metal, for example aluminum or magnesium. This material is not suitable, a permanently stable contact surface for the rolling elements designed here as balls 10 to form, between the two bearing parts 2 . 3 ensure a low-friction storage. Therefore, grooves are 4 respectively. 5 in the bearing parts 2 . 3 milled. In the grooves 4 . 5 are track plates 6 . 7 used in steel. The groove width B is slightly smaller than the width b of the raceway plates 6 . 7 so the plates 6 . 7 into the grooves 4 . 5 must be pressed during assembly. After pressing, they sit with press fit in the grooves 4 . 5 and thus reliable.

In the raceway plates 6 . 7 are circular arc runways 8th . 9 ground in, which is the contact surface for the balls 10 form. To ensure a long life are the surfaces of the raceway plates 6 . 7 hardened.

The track plates 6 . 7 consist of cut or cut parts of a profile bar having the illustrated cross-sectional shape. This is an extruded profile that can be produced inexpensively. The profile bar in this case has a longitudinal direction L, which is the direction of displacement of the linear bearing 1 equivalent.

To the translational displacement of the linear bearing 1 to limit are in the axial end regions, as in 1 for the one end of the track plate 6 to see, end stops 11 arranged. These end stops are short parts of the profile bar of the raceway plates 6 . 7 sawed off. This can be done quickly and inexpensively.

The short tails 11 are then - relative to the race plate in the longitudinal direction rotated by 180 ° - in the grooves 4 . 5 pressed in, causing for the balls 10 an end stop is defined.

In the illustrated solution are several balls 10 next to each other in a cage 12 arranged, ie at the relative displacement of the two bearing parts 2 . 3 the cage moves 12 including balls 10 at half the displacement speed along the raceway plate of a bearing part. Reaches the foremost ball in the direction of displacement 10 the end stop 11 , is the maximum displacement of the linear bearing 1 reached.

The Track profile is so executed that it is also at the same time can be used as an end stop or used as an end stop. The determination of the end stop takes place in the same cost-effective Way, as well as the raceway plates are fixed in the grooves.

1

linear bearings

2

bearing part

3

bearing part

4

groove

5

groove

6

Race plate

7

Race plate

8th

career

9

career

10

rolling elements

11

end stop

12

Cage

b

width the raceway plate

B

width the groove

L

longitudinal direction

Claims (10)

Linear bearings ( 1 ), the two relatively translationally displaceable bearing parts ( 2 . 3 ), each bearing part ( 2 . 3 ) at least one groove ( 4 . 5 ) into which a track plate ( 6 . 7 ) with at least one career ( 8th . 9 ) for rolling elements ( 10 ), wherein the raceway plate ( 6 . 7 ) consists of a section of a profile bar and wherein the translational displacement of at least one rolling element ( 10 ) on at least one track plate ( 6 . 7 ) by at least one at the axial end of the raceway plate ( 6 . 7 ) end stop ( 11 ) is limited, characterized in that the at least one end stop ( 11 ) consists of a further cut piece of the profile bar, which in the groove ( 4 . 5 ) is inserted, that the displaceability of the rolling elements ( 10 ) is limited. Linear bearing according to claim 1, characterized in that in both axial end portions of at least one raceway plate ( 6 . 7 ) one end stop each ( 11 ) is arranged. Linear bearing according to claim 1 or 2, characterized in that the end stop ( 11 ) relative to the raceway plate ( 6 . 7 ) is arranged rotated in the longitudinal direction (L) of the profile bar by 180 °. Linear bearing according to one of claims 1 to 3, characterized in that the raceway plate ( 6 . 7 ) has a rectangular basic shape in cross-section. Linear bearing according to one of claims 1 to 4, characterized in that the width (b) of the raceway plate ( 6 . 7 ) is slightly larger than the width (B) of the groove ( 4 . 5 ), so that the raceway plate ( 6 . 7 ) with interference fit in the groove ( 4 . 5 ) sits. Linear bearing according to one of claims 1 to 5, characterized that the profile bar is made of steel. Linear bearing according to claim 6, characterized that the surfaces the profile bar hardened are. Linear bearing according to one of claims 1 to 7, characterized that the rolling elements balls are. Linear bearing according to one of claims 1 to 8, characterized in that the rolling elements of a cage ( 12 ). Linear bearing according to claim 8 and 9, characterized in that a number of balls in the longitudinal direction (L) of the profile bar side by side in the cage ( 12 ) is arranged.