DE202015105280U1 - Rolling bearings for linear guidance - Google Patents

Abstract

Roller bearing for linear guidance, comprising: - an inner ring (1) comprising: - cages (4, 5) in which balls (7) move, each cage (4, 5) having a line of contact (4) and a return line (5), the contact line (4) having an inclination angle (α) with respect to a central longitudinal axis (9); and - an inner ring (2) which constitutes the outer casing of an inner ring (1); and characterized in that: - the cages (4, 5) are arranged in pairs so that the contact lines (4) are between the return lines (5); and - that it further comprises lubricants (6) for lubricating the balls (7) as they travel along the return lines (5); so that the balls (7) are lubricated on their way along the contact lines (4).

Description

FIELD OF THE INVENTION

The subject of the present invention is a rolling bearing for linear guidance, which increases the capacity for carrying large - static and dynamic - loads and thereby reduces maintenance.

BACKGROUND OF THE INVENTION

Currently known are rolling bearings for linear guidance of large loads in their movement, such. B. in the utility model with the publication number ES1013613U described. These bearings are characterized by a series of contact lines and consequently also by a series of return lines, which extend at a certain angle with respect to a movement axis.

This arrangement of the contact lines and the return lines increases the contact area between the rolling bearing and the movement axis, d. H. between the surface of balls moving along the lines of contact and said axis of motion. Due to this arrangement, the load capacity of the rolling bearings used increases.

In addition, there is no contact between the balls and the relevant axis by matching running paths due to the aforementioned angular arrangement with a view to the axis of movement. This results in a reduction of the wear of the balls and thus also of the rolling bearing. Another consequence of the described configuration is the fact that it also reduces the heating that occurs when moving large loads in the rolling bearings - more precisely, in the balls.

A problem of the known solution is that the load capacity of the bearings still has room for improvement and even further reductions are possible in view of the wear and heat development to be determined here. Since these are components installed in complex structures where large loads must be moved to perform replacement or maintenance operations, increasing the load capacity is not only important in terms of increasing the service life, but also , because this is accompanied by a reduction in the maintenance effort.

SUMMARY OF THE INVENTION

For the purpose of achieving these objects and to solve the various hitherto noted technical problems, to which are added, which are set out below, the present invention discloses a rolling bearing for linear guidance, which has an inner ring, which in turn comprises two cages, in which balls move, each cage having a line of contact and a return line, the line of contact forming an angle of inclination to a central longitudinal axis; In addition, an outer ring is present, which surrounds the inner ring from the outside.

An important feature of the present invention is that the cages are arranged in pairs so that the lines of contact are between the return lines; In addition, this bearing also contains lubricant which serves to lubricate the balls on their way along the return lines.

In this way, the balls are lubricated on their way along the contact lines.

Another important feature of the present invention is that the lubricant can be introduced so that it transfers to the balls by direct contact between balls and lubricant. Additionally or alternatively, the lubricant may be a solid amalgam of molybdenum bisulfide and graphite particles. Additionally or alternatively, the lubricant may be present at point concentrations or distributed in the form of microdots. Likewise, d. H. In addition to or as an alternative to the technical properties described above, the lubricant may be distributed in the rolling bearing by means of a sintering process.

An additional or alternative characteristic to the above-mentioned technical features of the present invention is that this rolling bearing comprises a holder configured to hermetically seal between the inside and the outside of the bearing when in contact with the axis of movement inserted into the rolling bearing Rolling produced. The holder can be a flexible rubber disc.

Another important feature of the present invention is that it may further comprise a rolling bearing retainer axially disposed with respect to a slidable block.

Additionally or alternatively to the properties described above, the angle of inclination preferably has an angle between 0.5 ° and 5 °, but preferably a value between 1 ° and 3 °; even better, however, would be a value of 2 °.

DESCRIPTION OF THE DRAWINGS

The description is supplemented for ease of understanding by a series of drawings that are intended to illustrate the embodiments, but are not exhaustive; the following views are shown:

1 shows a front view (cross section) of a rolling bearing according to the invention for linear guidance and a detailed view of one end of the respective rolling bearing.

The 2a . 2 B and 2c show an elevation of the rolling bearing according to the invention for linear guidance in various preferred embodiments as well as comparisons to a rolling bearing, which reflects the state of the art.

Below is a listing of the various components shown in the figures which describe the invention:

LIST OF REFERENCE NUMBERS

α

tilt angle

1

inner ring

2

outer ring

2 '

axial restraint device

3

holder

4

contact line

5

Recirculation line

6

lubricant

7

roll

8th

motion axis

9

middle longitudinal axis

10

movable block

11

clamp

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION

As previously mentioned and in 1 and 2 to see, the present invention comprises a roller bearing for linear guidance, which has an outer ring ( 2 ), an inner ring ( 1 ) and lubricants ( 6 ). The present rolling bearing is preferably made of metal, thereby forming a compact whole. 1 shows this rolling bearing in a state in which it for reasons of clarity not in a movement axis ( 8th ) is introduced; the relevant movement axis ( 8th ) is present in the presentation. The detail view in 1 also includes the movement axis inserted into the rolling bearing ( 8th ).

The inner ring ( 1 ) is axially inside the outer ring ( 2 ) blocked; as a result, both are in contact with each other, as in 1 shown. This will cause the inner ring ( 1 ) fixed in the outer ring ( 2 ) attached. At the one elongated end the outer ring surrounds ( 2 ) at least partially the inner ring ( 1 ) and thus prevents the passage of the inner ring ( 1 ) through this end. At the other elongated end, however, surrounds a clamping piece ( 11 ) such. B. a metal disc partially in the outer ring ( 2 ), at least partially the inner ring ( 1 ) and thus prevents its passage through said other end.

Inside the outer ring ( 2 ) is located directly in contact with this inner ring ( 1 ), wherein the inner ring ( 1 ) by a clamping piece ( 11 ) is blocked, for. As a metal plate preferably made of metal. This outer ring ( 2 ) comprises an axially arranged retaining device ( 2 ' ) bearing the rolling bearing facing a sliding block ( 10 ) should lock. The illustrated in the figures, axial restraint device ( 2 ' ) is an annular protrusion on the outer side of the outer ring ( 2 ); but in other preferred embodiments, this device may also be designed in the form of punctiform elevations along the outer edge, as a combination of one or more annular and punctiform elevations, etc.

The movable block ( 10 ) is the support on which machines or machine parts rest, which are moved linearly into positions in which these machines are used. To perform this linear movement, the movable blocks ( 10 ) at the axes of motion ( 8th ) along; this takes place via rolling bearings for linear guidance, which are used as connecting pieces between displaceable blocks ( 10 ) and axes of motion ( 8th ) act.

For this reason, it is very important to have rolling bearings that allow such movements while having the highest possible load capacity for both static and dynamic loads; In addition, the lowest possible maintenance is required in this way to ensure proper functioning. Since they are difficult to repair or replace parts, extending their service life from a logistical and economic point of view is very important. In addition, it should be considered that, at least in some cases, the speed of movement of large loads is high, which further increases the load on the rolling bearings.

The inner ring ( 1 ) includes cages ( 4 . 5 ), into the balls ( 7 ) are used, which move there as rotating elements of the bearing. Every cage ( 4 . 5 ) includes both a contact line ( 4 ) as well as a return line ( 5 ), creating a closed circuit for the balls ( 7 ) one and the same cage ( 4 . 5 ) arises.

Are the balls lying ( 7 ) in the contact line ( 4 ) and is the axis of motion ( 8th ) are inserted into the interior of the rolling bearing, the balls ( 7 ) in contact with the relevant movement axis ( 8th ) and the friction is reduced, whereby the movable blocks ( 10 ) at the axes of motion ( 8th ) can move along. The return line ( 5 ) is the way the balls ( 7 ) to return to the contact line ( 4 ) after they get along the line of contact ( 4 ) have moved.

The contact lines ( 4 ) run straight, overlooking a central longitudinal axis ( 9 ) but still in a slight inclination or a slight angle to a central longitudinal axis ( 9 ), the inner cavity of the rolling bearing, more precisely, the inner ring ( 1 ). This inclination, deviation or deviation is expressed by an angle of inclination (α), which can be seen from the figures. Preferably, but not necessarily, the return lines ( 5 ) also straight and parallel to the contact lines ( 4 ).

The angle of inclination (α) is preferably between 0.5 ° and 5 °, but preferably between 1 ° and 3 °; even better, however, would be a value of 2 °. According to this configuration, the balls are ( 7 ) of a cage ( 4 . 5 ) not in contact with the movement axis at the same time ( 8th ) on converging paths. This increases the contact surface between the movement axis ( 8th ) and rolling bearings. And it leads to a reduction in heating and wear of the bearing and to increase the load capacity of the bearing.

The cages ( 4 . 5 ) are arranged in pairs. These groupings are done in such a way that the two contact lines ( 4 ) in a central zone of the grouping are close to each other, whereas the two return lines ( 5 ) are on the outside, ie on both sides of the two contact lines in question ( 4 ); This is clear from the figures.

This configuration comprises a series of larger contact areas between the rolling bearing and the movement axis ( 8th ), which in turn leads to a considerable increase in the static and dynamic load capacity, when compared with the rolling bearings, which reflect the state of the art.

The configuration described leads to a number of designs, some of which are incorporated in the 2a . 2 B and 2c are shown; these always have an even number of cages ( 4 . 5 ) on. 2a shows a comparison between the rolling bearing of the invention and the prior art; both include 6 enclosures or cages ( 4 . 5 ). 2 B shows the same comparison of rolling bearings containing 8 cages ( 4 . 5 ); in 2c the comparison is made for roller bearings with 10 cages ( 4 . 5 ). The figures in question clearly show that the present rolling bearing provides a more stable and efficient support for absorbing stresses or loads; the direction of action of the relevant stresses or loads is represented by an arrow on the respective rolling bearing.

This is the result of combining pairs of contact lines ( 4 ), since it is possible to use these ( 4 ) in pairs at an inclined angle to each other, since the present configuration, a closer approximation between the two contact lines ( 4 ). This arrangement of the contact lines ( 4 ) improves the properties of rolling bearings with regard to loads and stresses. In addition, this arrangement comprises a lubricating medium as described below.

The rolling bearing for linear guidance according to the invention comprises the lubricant ( 6 ), externally and after cage pairs ( 4 . 5 ) is attached to the respective groupings. In this way, the interior of the inner ring ( 1 ) with lubricant ( 6 ) Mistake.

Two feedback lines ( 5 ), which belong to different groups - arranged in pairs according to cages ( 4 . 5 ) - the lubricant belonging to a specific point ( 6 ) if the return lines in question ( 5 ) are close to each other. This arrangement is the 2 B and 2c refer to. Out 1a however, it is clear how each pair of cages ( 4 . 5 ) outside and near each return line ( 5 ) with lubricant ( 6 ) is provided.

When the balls ( 7 ) along the return lines ( 5 ), they come into direct contact with the lubricant ( 6 ). When the balls ( 7 ) the contact lines ( 4 ), these will ( 7 ) lubricated by it. This fact leads to the fact that the rotating elements of the present bearing are lubricated at all times, without the additional use of maintenance personnel would be required.

The lubricant ( 6 ) is a solid amalgam of molybdenum bisulfide and graphite particles. This lubricant ( 6 ) is a solid lubricant ( 6 ) caused by the gradually occurring wear caused by the friction between the balls ( 7 ) and the solid lubricant ( 6 ), ensures that the rotatably mounted components are wetted with the solid mixture of the respective particles, which consist of various materials. These particles reduce friction, improve gliding or movement between them Elements inside the inner ring ( 1 ) are exposed to friction, namely the balls ( 7 ) and the axes of motion ( 8th ).

The lubricant ( 6 ) is present either in punctual concentrations or in the form of microdots on the return lines ( 5 ). The lubricant ( 6 ), which comprises the present invention, is in the rolling bearing - more precisely, in the inner ring ( 1 ) - distributed by means of a sintering process.

The present invention further comprises a holder ( 3 ) in a region located near the elongated end of each rolling bearing, as is clear 1 evident. In these areas, which are close to the elongated ends of the rolling bearings, the inner rings ( 1 ) annular grooves into which the holder ( 3 ) are inserted and fixed. With these holders ( 3 ) may be rubber discs that are so flexible that at least they can bend to insert into the ring openings. The holders ( 3 ) protrude in part beyond the annular grooves and exercise by direct contact thus pressure on the axes of motion ( 8th ) out. 1 and the detail view in 1 show a comparison between the condition of the holder ( 3 ) - once with inserted into the rolling bearing, once with not inserted movement axis.

Purpose of the holder ( 3 ) is, when used in the interior of the rolling bearing movement axis ( 8th ) to create a hermetic seal between the inside and the outside of the rolling bearing. The aim is therefore to prevent the penetration of solid particles, which could have a detrimental effect on the operation and the life of the rolling bearing, into the bearing interior and the lubricant ( 6 ) inside the bearing - more precisely, inside the inner ring ( 1 ) - to keep. The combination of the present solid lubricant ( 6 ) and the built-in holder ( 3 ) allows a considerable reduction or a complete redundancy of a lubrication maintenance.

By the properties of all described components and configurations of the rolling bearing according to the invention (the paired cages ( 4 . 5 ), for which a certain angle of inclination (α) is to be selected, the type of lubricant ( 6 ) and its distribution in contact with the balls ( 7 ), the holders ( 3 ), etc.), said rolling bearing can be used in larger temperature spectra than previously known bearings. The range of working temperatures at which full warranty is given lies for the rolling bearing according to the invention between -20 ° and 190 ° C.

After a description of the nature of the invention, the advantages thereof are enumerated, giving not only details, but also details of the changes which in the opinion of experts are deemed necessary, provided that the essential properties are not subjected to any change. The scope of the invention is, therefore, defined by the following claims.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• ES 1013613 U [0002]

Claims (11)

Roller bearing for linear guidance, comprising: - an inner ring ( 1 ), comprising: - Cages ( 4 . 5 ), in which balls ( 7 ), each cage ( 4 . 5 ) a contact line ( 4 ) and a return line ( 5 ), wherein the contact line ( 4 ) an inclination angle (α) with respect to a central longitudinal axis ( 9 ) having; and - an inner ring ( 2 ), the outer casing of an inner ring ( 1 ); and characterized in that: - the cages ( 4 . 5 ) are arranged in pairs so that the contact lines ( 4 ) between the return lines ( 5 ) are located; and - that he also lubricants ( 6 ) for the lubrication of the balls ( 7 ) as they travel along the return lines ( 5 ); so that the balls ( 7 ) on their way along the contact lines ( 4 ) are lubricated. Rolling bearing according to claim 1, characterized in that the lubricant ( 6 ) is introduced so that it is via a direct contact between balls ( 7 ) and lubricants ( 6 ) on the balls ( 7 ) transmits. Rolling bearing according to claim 2 or 3, characterized in that the lubricant ( 6 ) is a solid amalgam of molybdenum bisulfide and graphite particles. Rolling bearing according to one of the preceding claims, characterized in that the lubricant ( 6 ) is either present in punctual concentrations or distributed in the form of microdots. Rolling bearing according to one of the preceding claims, characterized in that the lubricant ( 6 ) is distributed with a sintering process in the rolling bearing. Rolling bearing according to one of the preceding claims, characterized in that it has a holder ( 3 ) which is configured to be in contact with the axis of movement (FIG. 8th ) inserted in the rolling bearing creates a hermetic seal between the inside and the outside of the rolling bearing. Rolling bearing according to claim 6, characterized in that the holder ( 3 ) is a flexible rubber disc. Rolling bearing according to one of the preceding claims, characterized in that it has a view of a displaceable block ( 10 ) axially arranged retention device ( 2 ' ) of the rolling bearing. Rolling bearing according to one of the preceding claims, characterized in that the inclination angle (α) has a value between 0.5 ° and 5 °. Rolling bearing according to claim 9, characterized in that the inclination angle (α) has a value between 1 ° and 3 °. Rolling bearing according to claim 9 or 10, characterized in that the inclination angle (α) has a value of 2 °.

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