DE102018114509A1 - Sealing arrangement and rolling bearing with this - Google Patents

Abstract

The invention relates to a seal arrangement (21) for a roller bearing (01), comprising a bearing cage (06) and a seal (26), which have a common axis and opposite side surfaces.
According to the invention, the bearing cage (06) has on its side surface (09) facing the seal (26) all around a plurality of projections (11) extending axially in the direction of the seal (26). The seal (26) comprises an elastomeric sealing disk (13) and a disk-shaped sealing plate (12) arranged axially on the sealing disk (13). The sealing plate (12) lies directly against the bearing cage (06). Furthermore, the sealing plate (12) has a plurality of bulges (16) extending axially in the direction of the bearing cage (06). In operation, the bulges (16) come to rest against the projections (11) of the bearing cage (06) when dirt particles accumulate axially on the seal (26). The invention further relates to a roller bearing (01) with the sealing arrangement (21).

Description

Field of the Invention

The present invention relates to a sealing arrangement. Furthermore, the invention relates to a rolling bearing with such a sealing arrangement, which is particularly suitable for use on agricultural machines.

Background of the Invention

The DE 11 2010 006 035 T5 describes a comb cage for ball bearings. The cage has a body which consists of an annular end piece and an axial part. The cage includes protrusions that extend radially outward. The projections of the cage are used to hold and hold the rolling balls and to self-center the cage.

Various sealing systems are known which are intended to protect against the ingress of dirt into the bearing and which comprise elastomer seals and reinforcements. For example, when operating agricultural machinery, dirt particles and water regularly enter roller bearings. The dirt particles collect in the area of the seal of the rolling bearing, so that the dirt particles accumulate and compress. The gasket that is contaminated as a result is no longer fully functional, which can lead to the penetration of the dirt particles into the other bearing components and thus causes a functional restriction and premature aging of the gasket and the rolling bearing.

Object of the invention

Starting from the prior art, the object of the present invention is to provide an improved and simple sealing arrangement for a roller bearing, by means of which the accumulation and penetration of dirt particles into the sealing system is effectively prevented without requiring a large amount of installation space.

Description of the invention

The stated object is achieved by a sealing arrangement according to the present claim 1 and by a roller bearing with a sealing arrangement according to the present independent claim 8.

The sealing arrangement according to the invention for a rolling bearing comprises a bearing cage and a seal which have a common axis. The bearing cage and the seal are arranged parallel to one another, so that one of their side surfaces is arranged opposite each other. The bearing cage has a plurality of projections or elevations all around on its side surface facing the seal. The projections extend in the axial direction, i. H. they rise above the main plane of the side surface. The seal comprises an elastomeric sealing washer and a disk-shaped sealing plate. The sealing plate is arranged axially on the sealing washer. The sealing plate is directly opposite the bearing cage. On the side surface facing the bearing cage, the sealing plate has a plurality of curvatures which extend axially in the direction of the bearing cage, i. H. rise above the main level. During operation, the curvatures of the sealing plate come into contact with the projections of the bearing cage if there is an accumulation of dirt on the seal. If there are no or only a few dirt particles on the seal, especially the sealing washer, a gap remains between the sealing plate and the bearing cage, both in the idle state and in operation, also in the area of the bulges, so that excessive wear due to friction cannot occur.

On the seal of the seal assembly that can be installed in a rolling bearing, it can be in operation, i. H. during the rotation of the rolling bearing and the parts of the sealing arrangement, dirt particles accumulate and accumulate. The dirt particles can condense over time. Due to the accumulation of dirt particles, the seal changes its position at least in sections, so that the curvatures of the sealing plate come to rest on the projections of the bearing cage. Due to the extensive arrangement of the projections on the bearing cage and the curvatures on the sealing plate, a vibrating movement of the elastically designed sealing washer is produced when the sealing plate contacts the bearing cage and when the two components rotate relative to one another. The vibrating movement causes the dirt particles lying against the sealing disk to be thrown away and / or ejected. If there is no contact of the sealing plate with the bearing cage, so the two components are spaced apart from one another by a gap because no or only a small amount of dirt particles have accumulated, there is no vibrating movement of the sealing disk. During the idle state and with a small accumulation of dirt particles, there is preferably a gap, which is at a small distance, between the curvatures of the sealing plate and the projections of the bearing cage.

If dirt particles accumulate on the seal, in particular on the sealing washer, then a force acting radially outwards acts upon rotation.

In one embodiment, the seal has a machine element which delimits a free space with the sealing disk. The machine element is preferably inelastic. During operation, dirt particles can accumulate in the free space, so that an axial force acts on the sealing washer and the sealing plate lying thereon, as a result of which the curvatures of the sealing plate come to rest on the projections of the bearing cage.

The vibrating movement generated when the sealing plate comes into contact with the bearing cage and when the two components rotate relative to one another is periodic. The vibrating movement is preferably wave-shaped or oscillatory.

The bearing cage is preferably made of a plastic. It is preferably produced by means of an injection molding process. The bearing cage is preferably annular. The bearing cage preferably has at least two projections on its side surface. The bearing cage particularly preferably has at least four projections on its side surface.

The projections can also be called noses. The projections of the bearing cage are preferably wedge-shaped, the profile initially slowly rising all the way round and falling sharply or vertically after the maximum elevation. Alternatively, the projections of the bearing cage are preferably conical. Other alternative forms of the projections are conceivable. The projections are arranged circumferentially on the side surface of the bearing cage, preferably evenly spaced from one another.

Furthermore, the bearing cage preferably has a plurality of rolling element receptacles on its side surface which lies opposite the side surface which has the projections. Alternatively, the rolling element receptacles are formed on a circumferential surface of the bearing cage. Rolling elements can be positioned in the rolling element receptacles.

The disc-shaped sealing plate is preferably made of a metal. The sealing plate is preferably stamped from a metal, the curvatures being embossed. The curvatures are preferably arranged evenly all around on the side surface of the sealing plate. The curvatures are preferably arranged radially on the inside of the sealing plate.

The curvatures are preferably spherical, in the form of a hemisphere. The curvatures preferably form depressions which are axially concave in the direction of the bearing cage and accordingly have a cavity. Alternatively, the curvatures are preferably formed on one side surface of the sealing plate and the sealing plate has no depressions or cavities on the opposite side surface and is designed in a straight line.

A sealing lip is preferably formed on the inner circumference of the sealing disk. Particularly preferably, two sealing lips are formed on the inner circumference of the sealing washer, which are oriented axially in opposite directions. The sealing washer has an enlargement of material on its outer circumference which forms a bead which forms a sealing seat in the installed state. In one embodiment, the sealing washer is axially profiled.

An advantage of the sealing arrangement for a rolling bearing according to the invention is that accumulations of dirt particles are automatically ejected and thus excessive wear of the seal and other rolling bearing components is prevented. For example, the excessive abrasion of the sealing lips or the sealing washer in the contact area to the bearing rings is prevented. Another advantage of the sealing arrangement is that it can be easily manufactured using known means. It is also advantageous that the installation of the sealing arrangement in a rolling bearing is simple.

In addition to dirt, dirt particles can also be understood to mean water, in particular dirty water. Dirt particles are preferably to be understood to mean all, in particular undesirable, deposits that occur in the environment.

The rolling bearing according to the invention comprises two bearing rings which can be rotated relative to one another and are arranged coaxially. Furthermore, the rolling bearing has rolling elements which are arranged between the bearing rings. Furthermore, the roller bearing comprises a sealing arrangement which corresponds to the sealing arrangement according to the invention described above with all of its embodiments. The bearing cage and the seal are preferably arranged radially between the bearing rings. The seal is arranged on the outer bearing ring in a rotationally fixed manner and lies against the inner bearing ring. The rolling elements are arranged in the rolling element receptacles of the bearing cage that guides them. The bearing cage rotates with the rolling elements during operation. The seal rotates during operation with the outer bearing ring, so that the bearing cage and the seal preferably have different speeds of rotation.

The outer bearing ring preferably has a circumferential groove formed on its inner circumference. The seal is in the groove preferably arranged radially with their sealing seat. The sealing plate can also act as reinforcement.

The roller bearing with the sealing arrangement can particularly preferably be used in agricultural machines.

list of figures

• 1 eine Explosionsansicht eines erfindungsgemäßen Wälzlagers;
• 2 eine Seitenansicht und einen Längsschnitt des Wälzlagers;
• 3 einen Ausschnitt des in 2 gezeigten Wälzlagers im Ruhezustand;
• 4 einen Ausschnitt des in 2 gezeigten Wälzlagers im Betriebszustand;
• 5 zwei Ansichten eines Lagerkäfigs für eine erfindungsgemäße Dichtungsanordnung;
• 6 zwei Ansichten einer Dichtplatte für die Dichtungsanordnung;
• 7 eine Draufsicht auf eine erfindungsgemäße Dichtung.

Further details, advantages and further developments result from the following description of preferred embodiments of the invention with reference to the attached drawings. Show:

• 1 an exploded view of a rolling bearing according to the invention;
• 2 a side view and a longitudinal section of the rolling bearing;
• 3 a section of the in 2 roller bearing shown in the rest state;
• 4 a section of the in 2 Rolling bearing shown in the operating state;
• 5 two views of a bearing cage for a sealing arrangement according to the invention;
• 6 two views of a sealing plate for the sealing arrangement;
• 7 a plan view of a seal according to the invention.

Detailed description of the drawings

1 shows an exploded view of a rolling bearing according to the invention 01 , The roller bearing 01 includes a bottom bracket ring 02 and an outer bearing ring 03 which are arranged coaxially to each other. The bearing rings 02 . 03 are rotatable to each other. Between the bearing rings 02 . 03 are spherical rolling elements 04 arranged on which the bearing rings 02 . 03 roll. The rolling bearing also includes 01 an annular bearing cage 06 , The rolling elements 04 are from the storage cage 06 held or guided, the bearing cage 06 on one of the rolling elements 04 facing first side surface 07 several rolling element holders 08 having. The rolling element receptacles 08 serve to accommodate and guide the rolling elements 04 , The number of rolling element receptacles 08 corresponds to that in the rolling bearing 01 number of rolling elements located 04 , The rolling element receptacles 08 are evenly circumferential on the first side surface 07 of the bearing cage 06 distributed. On one of the rolling element receptacles 08 opposite second side surface 09 of the bearing cage 06 this has several protrusions 11 on. There are four tabs 11 evenly distributed on the second side surface 09 of the bearing cage 06 arranged. The tabs 11 are wedge-shaped, rising all the way in the same direction and reaching the same maximum height. The bearing cage 06 consists of a plastic. The rolling bearing also includes 01 a sealing plate 12 and a sealing washer 13 , The sealing plate 12 and the sealing washer 13 are arranged axially next to each other. The sealing plate 12 is axially adjacent to the bearing cage 06 arranged. The sealing plate 12 is disc-shaped and has a side surface 14 several arches 16 on. The bulges 16 are all around, evenly distributed on the side surface 14 formed radially inside. The bulges 16 are spherical and extend axially in the direction of the bearing cage 06 , Between the ledges 11 of the bearing cage 06 and the arches 16 the sealing plate 12 a gap remains in the assembled state. The sealing plate 12 is made of a metal, preferably stamped. The sealing washer 13 consists of an elastomer and has a bulge on its outer circumference 17 on, which is formed by a thickening of material and serves the tight seal seat. The sealing washer 13 sits rotatably with the bead 17 in one on the inner circumference of the outer bearing ring 03 trained groove 18 , The sealing washer also includes 13 at least one sealing lip 19 which on the bottom bracket ring 02 comes to the concern. The sealing washer 13 serves to seal the rolling bearing 01 , The bearing cage 06 , the sealing plate 12 and the sealing washer 13 together form a sealing arrangement according to the invention 21 ,

The two bearing rings rotate during operation 02 . 03 to each other. Particularly when used in the agricultural sector, dirt can accumulate on the sealing arrangement 21 come. The dirt particles collect on the axially outer side surface of the sealing washer 13 on which the sealing plate 12 is not arranged. The elastomeric sealing washer 13 moves from a certain amount of dirt particles together with the sealing plate arranged on it 12 axially in the direction of the bearing cage 06 , Due to the small spacing of the bearing cage 06 opposite the sealing plate 12 come the bulges 16 the sealing plate 12 on the ledges 11 of the bearing cage 06 to concern. There are only a few or no dirt particles on the sealing washer 13 on, there is a gap between the bulges both in the idle state and in operation 16 the sealing plate 12 and the ledges 11 of the bearing cage 06 , Due to the extensive arrangement of the projections 11 on the bearing cage 06 and the bulges 16 on the sealing plate 12 is in contact with the sealing plate 12 with the bearing cage 06 and with relative rotation of the two components 06 . 12 to each other a vibrating movement of the elastic sealing washer 13 generated. Due to the vibrating movement, the sealing washer 13 adjacent dirt particles are repelled and ejected.

2 shows two views of the in 1 roller bearing shown 01 , wherein a top view and a sectional view of the rolling bearing 01 is shown. The section view is along the section axis AA the top view of the rolling bearing 01 shown. This in 2 Rolling bearings shown 01 resembles that in 1 roller bearings shown 01 , This in 2 Rolling bearings shown 01 has two rolling element raceways 22 on that are spaced parallel to both the inner circumference of the outer bearing ring 03 as well as on the outer circumference of the bottom bracket ring 02 are trained. In the rolling element tracks 22 are the rolling elements 04 , Deviating from that in 1 roller bearings shown 01 indicates that in 2 Rolling bearings shown 01 the bearing cage 06 and another rolling element cage 23 on. The further rolling element cage 23 also has rolling element receptacles (not shown). In contrast to the bearing cage 06 has the other rolling element cage 23 no ledges 11 , The sealing washer 13 has two sealing lips 19 on, which are angled axially opposite.

3 shows a section X of the in 2 roller bearing shown 01 at rest. Between the sealing washer 13 with the sealing plate arranged on it 12 and the bearing cage 06 is a crack 24 educated. I.e. the bulges 16 the sealing plate 12 and the ledges 11 of the bearing cage 06 do not touch each other, there is a gap 24 , This state also exists in the operating state when there are no or only a few dirt particles on the sealing washer 13 have collected.

In 4 is a section X of the in 2 roller bearing shown 01 shown in the operating state. The section X is the same as in 3 shown section X. Deviating from 3 consists in the 4 shown operating state no gap between the sealing plate 12 and the bearing cage 06 , The bulges 16 the sealing plate 12 and the ledges 11 of the bearing cage 06 lie against each other.

5 shows two views of the bearing cage 06 for the sealing arrangement 21 , A perspective view and a top view are shown. The in 5 bearing cage shown 06 resembles that in 1 shown bearing cage 06 ,

6 shows two views of the sealing plate 12 for the sealing arrangement 21 , In the 6 shown sealing plate 12 resembles the in 1 shown sealing plate 12 ,

In 7 is a top view of a seal 26 shown which the sealing washer 13 and the sealing plate 12 includes. The sealing plate 12 is on the sealing washer 13 arranged. In the 7 shown sealing washer 13 resembles the in 1 shown sealing washer 13 and the in 7 shown sealing plate 12 corresponds to that in 1 as in 6 shown sealing plate 12 ,

LIST OF REFERENCE NUMBERS

01

roller bearing

02

Inner bearing ring

03

Outer bearing ring

04

rolling elements

05

-

06

bearing cage

07

first side surface of the bearing cage 06

08

rolling body

09

second side surface of the bearing cage 06

10

-

11

head Start

12

sealing plate

13

sealing washer

14

Side surface of the sealing plate 12

15

-

16

bulge

17

bead

18

groove

19

sealing lip

20

-

21

sealing arrangement

22

rolling body

23

Rolling Element

24

gap

25

-

26

poetry

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Patent literature cited

• DE 112010006035 T5 [0002]

Claims (10)

Sealing arrangement (21) for a rolling bearing (01), which has a bearing cage (06) and a seal (26) with a common axis and opposite side surfaces, characterized in that the bearing cage (06) on its side surface facing the seal (26) (09) has a plurality of projections (11) which extend axially in the direction of the seal (26), and that the seal (26) has an elastomeric sealing disk (13) and a disk-shaped sealing plate (12) arranged axially on the sealing disk (13). The sealing plate (12) is directly opposite the bearing cage (06) and has a plurality of bulges (16) extending axially in the direction of the bearing cage (06), the bulges in any case during operation when dirt particles accumulate on the seal (26) (16) on the projections (11) of the bearing cage (06) come to rest. Sealing arrangement (21) after Claim 1 , characterized in that the sealing washer (13) has at least one sealing lip (19) on its inner circumference. Sealing arrangement (21) after Claim 1 or 2 , characterized in that the sealing washer (13) has on its outer periphery a bead (17) which forms a sealing seat. Sealing arrangement (21) according to one of the Claims 1 to 3 , characterized in that the sealing plate (12) consists of a stamped metal. Sealing arrangement (21) according to one of the Claims 1 to 4 , characterized in that the bearing cage (06) includes receptacles (08) for rolling elements (04). Sealing arrangement (21) according to one of the Claims 1 to 5 , characterized in that the bearing cage (06) consists of a plastic. Sealing arrangement (21) according to one of the Claims 1 to 6 , characterized in that the bearing cage (06) has at least four projections (11). Sealing arrangement (21) according to one of the Claims 1 to 7 , characterized in that the curvatures (16) of the sealing plate (12) have a position on the side surface which is evenly spaced radially to the axis. Rolling bearing (01), comprising two bearing rings (02, 03) rotatable relative to one another about a common axis, rolling elements (04) arranged between them and a sealing arrangement (21) according to one of the Claims 1 to 8th , Rolling bearing (01), after Claim 9 , characterized in that the seal (26) is arranged on the outer bearing ring (03).

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