DE102019132951A1 - Sealing unit, method of assembling a sealing unit and sliding bearing with a sealing unit - Google Patents

Abstract

The invention relates to a sealing unit (1) for a bearing (2), in particular a pivot bearing. The sealing unit (1) comprises an annular carrier element (3) and an elastic sealing body (4), the sealing body (4) being connected to the carrier element (3) and the sealing body (4) at least one radially inward in the area of its inner diameter has pointing sealing lip (5). In the area of its outer diameter, the sealing body (4) has a radially outwardly pointing fastening projection (6) for clamping fastening in an annular groove (7) of an outer ring (8) of the bearing (2), the sealing body (4) being designed in such a way that that the fastening projection (6) in the assembled state of the sealing unit (1) rests against a first area (10) of the wall of the annular groove (7) with a first fastening projection part (9) pointing outward in the axial direction and with a second fastening projection part (11) , facing inward in the axial direction, lies opposite in the annular groove (7) on a second area (12) of the wall of the annular groove (7) such that the fastening projection (6) with its first fastening projection part (9) against the first area (10) the outer side wall of the annular groove (7) is pressed. According to the invention, the first fastening projection part (9) is designed as a resilient, annular, circumferential nose (13), the nose (13) seen in cross section with its longitudinal axis (14) at an angle (15) deviating from the radially extending groove center axis (16) is formed directed obliquely outward.

Description

Field of invention

• - ein ringförmiges Trägerelement und- einen elastischen Dichtungskörper,
• - wobei der Dichtungskörper mit dem Trägerelement fest verbunden ist,
• - wobei der Dichtungskörper im Bereich seines Innendurchmessers zumindest eine Mehrzahl von radial nach innen weisenden Dichtlippen aufweist,
• - wobei der Dichtungskörper im Bereich seines Außendurchmessers einen radial nach außen weisenden Befestigungsvorsprung zur klemmenden Befestigung in einer Ringnut eines Außenrings des Lagers aufweist, und
• - wobei der Dichtungskörper derart ausgebildet ist, dass der Befestigungsvorsprung im montierten Zustand der Dichtungseinheit mit einem ersten Befestigungsvorsprungsteil in axialer Richtung nach außen weisend an einem ersten Bereich der Wandung der Ringnut anliegt und mit einem zweiten Befestigungsvorsprungsteil, in axialer Richtung nach innen weisend, gegenüberliegend in der Ringnut an einem zweiten Bereich der Wandung der Ringnut anliegt, derart, dass der Befestigungsvorsprung mit seinem ersten Befestigungsvorsprungsteil gegen den ersten Bereich der äußeren Seitenwandung der Ringnut gepresst wird. Darüber hinaus betrifft die Erfindung ein Gleitlager, welches bevorzugt als Gelenklager ausgebildet ist und eine erfindungsgemäße Dichtungseinheit umfasst, sowie ein Verfahren zur Montage einer erfindungsgemäßen Dichtungseinheit in einen Außenring eines Lagers.

The present invention relates to a sealing unit for a bearing, in particular comprising a spherical plain bearing

• - an annular support element and - an elastic sealing body,
• - wherein the sealing body is firmly connected to the carrier element,
• - wherein the sealing body has at least a plurality of radially inwardly pointing sealing lips in the region of its inner diameter,
• - wherein the sealing body in the area of its outer diameter has a radially outwardly facing fastening projection for clamping fastening in an annular groove of an outer ring of the bearing, and
• - wherein the sealing body is designed such that the fastening projection in the assembled state of the sealing unit rests with a first fastening projection part facing outward in the axial direction on a first area of the wall of the annular groove and with a second fastening projection part facing inward in the axial direction, opposite in of the annular groove rests against a second region of the wall of the annular groove in such a way that the fastening projection with its first fastening projection part is pressed against the first region of the outer side wall of the annular groove. In addition, the invention relates to a sliding bearing, which is preferably designed as a spherical bearing and comprises a sealing unit according to the invention, and a method for mounting a sealing unit according to the invention in an outer ring of a bearing.

Background of the invention

Such a spherical plain bearing with an associated sealing unit is already from the DE 299 00 907 U1 previously known. As can be seen from the figures and the associated description, a sealing unit is arranged in a groove in the outer ring of a spherical plain bearing and is in contact with the spherically curved outer surface of the inner ring. The sealing unit consists of an angular support which is connected to the elastic sealing body, which in turn is in contact with the outer surface of the inner ring. The sealing body is received at the outer end with a projection from the circumferential groove in the outer ring and has a sealing lip pointing in the direction of the inner ring, which rests on the inner ring with two rubbing sealing edges.

Another spherical plain bearing together with a sealing unit, of a similar design, is from the DE 10 2005 029 979 A1 known.

Furthermore, for example, radial spherical plain bearings with the structure described above are known from the applicant's offer, which guarantee freedom from maintenance and a long service life. This is of great importance for the selection of spherical plain bearings (especially so-called ELGES spherical plain bearings), for example in modern rail vehicles. Smaller-dimensioned spherical plain bearings are used, for example, in door systems, while the medium-sized ones for tilting technology or bearings with large dimensions can preferably be used in couplings. For example, in the main tilt mechanism, maintenance-free, so-called Elgoglide® (Elgoglide is a PTFE fabric consisting of Teflon and support fibers) coated standard spherical bearings are used.

Object of the invention

The invention is based on the object of providing a sealing unit which enables the sealing unit to be installed more easily in an outer ring of a bearing, in particular a spherical bearing. It is advantageous to provide a sealing unit which is further optimized with regard to a secure fit of the seal in the bearing outer ring.

Description of the invention

This object is achieved by a sealing unit with the features of patent claim 1, by a slide bearing with the features of the patent claim 9 and by a method for assembling such a sealing unit in the outer ring of a bearing according to claim 10.

A sealing unit according to the invention for a bearing, in particular a pivot bearing, comprises an annular carrier element and an elastic sealing body. The sealing body is firmly connected to the carrier element and has at least one radially inwardly pointing sealing lip in the region of its inner diameter and a radially outwardly pointing fastening projection in the region of its outer diameter for clamping fastening in an annular groove of an outer ring of the bearing. In addition, the sealing body is designed in such a way that, in the assembled state of the sealing unit, the fastening projection has a first fastening projection part facing outwards in the axial direction on a first Area of the wall of the annular groove and with a second fastening projection part, facing inward in the axial direction, lies opposite in the annular groove on a second area of the wall of the annular groove, in such a way that the fastening projection with its first fastening projection part against the first area of the outer side wall of the Ring groove is pressed. According to the invention, the first fastening projection part is designed as an elastic or resiliently ring-shaped circumferential nose, the nose being designed in cross section with its longitudinal axis directed obliquely outward at an angle deviating from the radially extending groove center axis. In this way, a sealing unit for a bearing, in particular a sealing unit for a slide or joint bearing, is provided, which allows a considerably simplified assembly. The seal according to the invention can simply be placed from the outside onto the bearing outer ring and axially pressed into it. During the press-in process, the flexible, resilient nose (also referred to as a snap-in nose) can fold over until it snaps into the annular groove of the bearing outer ring due to its spring-elastic flexible design and thus keeps the seal securely positioned in the annular groove. Even when assembling the mutual seal and possibly pressing them over, the already assembled seal cannot be pressed out of the recess or the annular groove of the bearing outer ring due to the flexibility and resilience of the nose. The annular groove is preferably designed in such a way that the inner wall of the same, viewed in cross section, does not run orthogonally to the central axis of the bearing, but rather obliquely inwards towards the interior of the bearing, which in turn supports both the assembly and the secure fit of the sealing device in the annular groove.

First, the essential elements of the claimed subject matter of the invention are explained in the order in which they are named in the set of claims and particularly preferred embodiments of the subject matter of the invention are described below.

Plain or spherical bearings in the sense of the invention are bearings with an inner ring and with an outer ring, whereby no rolling elements are arranged between the inner and outer ring, but the rotational mobility between the inner and outer ring is ensured by the fact that between the running surfaces of the inner and outer rings and outer ring the occurring sliding friction is minimized. This is done, for example, by lubricating the bearing surfaces by supplying lubricant to the sliding surface through corresponding feed bores in the outer ring. In addition, the inner ring can also be provided with a corresponding feed bore so that a shaft received by the inner ring can also be lubricated.

In the case of a spherical plain bearing with an outer ring fixedly arranged in a housing, the inner ring can, for example, be moved in a rotating manner about its bearing axis, with pivoting about the bearing center point also being possible.

These sliding or joint bearings can be protected against soiling by means of sealing units, such a bearing preferably accommodating corresponding sealing units arranged at both outer axial ends between the inner and outer rings. These sealing units advantageously include a carrier ring, in particular a metallic carrier ring, which is vulcanized into a sealing body made of elastomer, the sealing body having at least one sealing lip directed radially inward and having a circumferential fastening projection on its outer circumference for mounting in an inner annular groove of the bearing outer ring.

The lubrication of the sliding surfaces located between the inner and outer ring, which are formed by a partial circumferential outer surface of the inner ring and a partial circumferential inner surface of the outer ring, can be done either by lubricants such as oils or greases or in so-called maintenance-free bearings by between the Coated mat-like sliding inserts arranged on sliding surfaces.

According to an advantageous embodiment of the invention it can be provided that the first fastening projection part is designed in such a way that the nose during an assembly process of the sealing unit in the annular groove of the outer ring of the bearing by an angle deviating from the radially extending groove center axis in a range between 90 degrees and 0 Angular degrees, particularly preferably in a range between 90 degrees and 30 degrees, is pivotable. Such an elasticity of the circumferential snap-in nose can ensure very simple assembly and secure positioning of the sealing unit in the annular groove of the bearing outer ring.

According to a further preferred further development of the invention, it can also be provided that the first fastening projection part, designed as a nose, has an annular circumferential undercut, whereby the snap-in nose can be pressed over during the assembly process and can insert into the undercut and fold out again when the annular groove is reached . This further simplifies assembly and increases the flexibility of the fastening projection of the Sealing element and thus the secure positioning in the annular groove further improved.

Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the second fastening projection part has two support projections formed coaxially around an axial central axis of the sealing unit. The seal can be pressed over further in the direction of the inside of the bearing during assembly through the recess of the elastomer body formed between the shoulder projections, in order to allow the flexible snap-in lug to slide into the annular groove of the outer bearing ring.

Furthermore, the two shoulder projections resulting from the recess and designed as elastomer rings serve to permanently support the seal during operation.

According to a further particularly preferred embodiment of the invention, it can be provided that the carrier element is L-shaped as seen in cross section, wherein in the assembled state of the sealing unit a first carrier element leg is directed axially inward and a second carrier element leg is directed radially inward, the two support projections, of the second fastening projection part are arranged on different sides of the longitudinal axis of the first support element leg. As a result, an optimized distribution of force on the two shoulder projections is generated and the seating of the fastening projection in the annular groove is further improved.

Furthermore, the invention can also be further developed in such a way that a third fastening projection part is provided which, in an assembled state of the sealing unit, is supported radially outward against the outer ring outside the annular groove. It is particularly preferable for the third fastening projection part to have at least one support projection extending in a ring-shaped manner. In a further development, two ring-shaped circumferential support projections arranged coaxially to one another can also be provided. In this way, additional axial support of the sealing unit and improved sealing of the sealing seat can be achieved.

It can also be advantageous to further develop the invention in such a way that the third fastening projection part, viewed in the radial direction, is arranged below the first fastening projection part and above the second fastening projection part. The advantage that can be realized in this way is a further improved distribution of forces on the contact points of the sealing unit in the assembled state and a further improved sealing seat in the annular groove of the bearing outer ring as a result.

• - Bereitstellen eines eine Ringnut aufweisenden Außenrings eines Lagers,
• - Bereitstellen einer Dichtungseinheit gemäß einem der vorstehenden Ansprüche,
• - Einpressen der Dichtungseinheit durch eine axial gerichtete Kraft auf die Dichtungseinheit und oder den Außenring.

A method according to the invention for mounting a sealing unit described above in the annular groove of a bearing outer ring comprises the method steps:

• - Provision of an outer ring of a bearing having an annular groove,
• - Providing a sealing unit according to one of the preceding claims,
• - Pressing in the sealing unit by an axially directed force on the sealing unit and / or the outer ring.

The special design of the sealing unit according to the invention enables assembly in a closed - that is, not spread and not divided - bearing outer ring.

Finally, the invention comprises a plain bearing, in particular designed as a spherical plain bearing, with a sealing unit, as described above. This creates a sliding bearing in which the bearing or sliding surfaces are efficiently protected against the ingress of dirt. Furthermore, a plain bearing with such a sealing unit is also secured against leakage of any lubricant that may be used.

Figure list

• 1 ein herkömmliches Gelenklager mit in Ringnuten des Lageraußenrings eingesetzten Dichtungseinheiten in einem Teil-Axialschnitt,
• 2 eine erfindungsgemäße Dichtungseinheit eingesetzt in einer Ringnut eines Lageraußenrings eines in einem vergrößerten Teilausschnitt dargestellten Gelenklagers in einem Axialschnitt in Prinzipdarstellung, und
• 3 eine erfindungsgemäße Dichtungseinheit eingesetzt in einer Ringnut eines Lageraußenrings eines in einem vergrößerten Teilausschnitt dargestellten Gelenklagers in einem weiteren Axialschnitt in Prinzipdarstellung.

A preferred embodiment of the sealing unit designed according to the invention is explained in more detail below with reference to the accompanying drawings without restricting the general inventive concept. Show:

• 1 a conventional spherical plain bearing with sealing units inserted in the annular grooves of the bearing outer ring in a partial axial section,
• 2 a sealing unit according to the invention inserted in an annular groove of a bearing outer ring of a spherical plain bearing shown in an enlarged partial section in an axial section in a schematic illustration, and
• 3rd a sealing unit according to the invention inserted in an annular groove of a bearing outer ring of a spherical bearing shown in an enlarged partial section in a further axial section in a schematic illustration.

Detailed description of the drawings

1 shows a sectional view of a bearing designed as a spherical plain bearing 2 According to the state of the art. This camp 2 has an inner ring, which is spherically curved over its Outer surface is received by the opposite spherically curved inner surface of the outer ring. To the camp 2 another poetry belongs 1 that in the in the outer ring 8th of the camp 2 circumferential ring groove 7th is attached. At the other end is the seal 1 with their sealing lips 5 rubbing against the spherically curved outer surface of the inner ring, so that the two curved surfaces of the bearing rings are protected against dirt penetrating from the outside. The 1 further shows that in the present example the camp 2 Can be relubricated, in which case both the inner ring and the outer ring 8th are provided with lubricant through-holes. As can also be seen, in the case of an outer ring that is fixedly arranged in the housing 8th the inner ring can be moved in a rotating manner about its bearing axis, whereby pivoting about the bearing center point is also possible.

The 2 and 3rd show a sealing unit according to the invention 1 used in an annular groove 7th of a bearing outer ring 8th a bearing designed as a spherical plain bearing, shown in a partial section 2 . The 2 and 3rd each show in a radial section through the sealing unit 1 in a schematic diagram. The sealing unit shown 1 for a warehouse 2 comprises an annular support element 3rd and an elastic seal body formed from an elastomeric material 4th , the seal body 4th with the carrier element 3rd , for example by vulcanization, is firmly connected. The seal body 4th has two sealing lips pointing radially inward in the area of its inner diameter 5 on, the outwardly directed or outwardly arranged sealing lip 5 has a first and a second sealing edge, the second sealing edge in a not yet run-in state of the first edge of the seal 5 does not yet come to rest on the inner ring. In the area of its outer diameter, the sealing body 4th a radially outwardly facing fastening projection 6th for clamping the sealing unit 1 in an annular groove 7th an outer ring 8th of the camp 2 on. The seal body 4th is also designed such that the fastening projection 6th in the assembled state of the sealing unit 1 with a first fastening protrusion part 9 facing outward in the axial direction at a first area 10 the wall of the annular groove 7th rests and with a second fastening projection part 11 , facing inward in the axial direction, opposite in the annular groove 7th on a second area 12th the wall of the annular groove 7th rests in such a way that the fastening projection 6th with its first fastening projection part 9 against the first area 10 the outer side wall of the annular groove 7th is pressed. The first fastening protrusion part 9 is according to the invention as a resilient ring-shaped circumferential nose 13th trained with the nose 13th seen in cross section with its longitudinal axis 14th at an angle 15th deviating from the radial groove center axis 16 is formed directed obliquely outward. From the 2 and 3rd it can also be seen that the first fastening projection part 9 is designed such that the nose 13th during an assembly process of the sealing unit 1 into the ring groove 7th of the outer ring 8th of the camp 2 at an angle 15th deviating from the radial groove center axis 16 is pivotable. In the present embodiment, the angle is approximately 45 degrees. The one as a nose 12th formed first fastening projection part 9 has, according to the embodiment shown, an annular circumferential undercut 17th on, in the nose 13th while pressing in the sealing unit 1 into the ring groove 7th of the outer ring 8th can fold into it. That of the first fastening projection part 9 second fastening projection part formed at an angle opposite one another 11 has two coaxially about a central axial axis of the sealing unit 1 support projections formed around 18th , 19th on ( 3rd ) over the nose 13th starting from the second area 11 (or the inner area) of the wall of the annular groove 7th against the first area 10 (or the outer area) of the wall of the annular groove 7th is pressed. That in the seal body 4th the sealing unit 1 vulcanized carrier element 3rd is L-shaped when viewed in cross section, with the sealing unit in the assembled state 1 a first support element leg 20th is directed axially inward and a second support element leg 21 is directed radially inward. The carrier element 3rd is arranged in such a way that the two support projections 18th , 19th of the second fastening protrusion part 11 on different sides of the extended longitudinal axis 22nd of the first axially inwardly extending support element leg 20th are arranged. Via the second support element leg 21 can the sealing unit 1 into the annular groove by means of a punch tool acting in the axial direction 7th be pressed. The seal body 4th the sealing unit 1 has a third attachment protrusion portion 23 onto. 3rd ), which is in an assembled state of the sealing unit 1 outside the ring groove 7th radially outwards against the outer ring 8th is supported and the sealing unit 1 against axial migration out of the annular groove 7th further safeguards. The third fastening protrusion part 23 has two annular circumferential support projections arranged coaxially to one another 24 on, which include an annular recess between them, which in turn increases the flexibility of the sealing body 4th further improved. As shown, the third attachment protrusion is 23 seen in the radial direction below the first fastening projection part 9 and above the second fastening protrusion part 11 arranged.

The invention is not limited to the embodiments shown in the figures. The above description is therefore not to be regarded as restrictive, but rather as explanatory. The following patent claims are to be understood in such a way that a named feature is present in at least one embodiment of the invention. This does not exclude the presence of further features. If the patent claims and the above description define “first” and “second” features, this designation serves to distinguish between two features of the same type without defining an order of precedence.

List of reference symbols

1

Sealing unit

2

warehouse

3

Support element

4th

Seal body

5

Sealing lip

6th

Fastening protrusion

7th

Ring groove

8th

Outer ring

9

Fastening protrusion

10

Area

11

Fastening protrusion

12th

Area

13th

nose

14th

Longitudinal axis

15th

angle

16

Groove center axis

17th

Undercut

18th

Support projection

19th

Support projection

20th

Support element leg

21

Support element leg

22nd

Longitudinal axis

23

Fastening protrusion

24

Support projection

25th

Inner ring

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 29900907 U1 [0002]
• DE 102005029979 A1 [0003]

Claims (10)

Sealing unit (1) for a bearing (2), in particular sealing unit (1) for a pivot bearing, comprising - an annular carrier element (3) and - an elastic sealing body (4), - wherein the sealing body (4) with the carrier element (3) is firmly connected, - wherein the sealing body (4) has at least one radially inwardly pointing sealing lip (5) in the area of its inner diameter, - wherein the sealing body (4) in the area of its outer diameter has a radially outwardly pointing fastening projection (6) for clamping fastening in an annular groove (7) of an outer ring (8) of the bearing (2), and - wherein the sealing body (4) is designed such that the fastening projection (6) in the assembled state of the sealing unit (1) with a first fastening projection part (9 ) rests against a first region (10) of the wall of the annular groove (7) pointing outward in the axial direction and inward in the axial direction with a second fastening projection part (11) n facing, lies opposite in the annular groove (7) on a second area (12) of the wall of the annular groove (7), such that the fastening projection (6) with its first fastening projection part (9) against the first area (10) of the outer Side wall of the annular groove (7) is pressed, characterized in that the first fastening projection part (9) is designed as an elastically annular circumferential nose (13), the nose (13) seen in cross section with its longitudinal axis (14) at an angle (15 ) deviating from the radially extending groove center axis (16) is formed obliquely outward. Sealing unit (1) Claim 1 , characterized in that the first fastening projection part (9) is designed such that the nose (13) during an assembly process of the sealing unit (1) in the annular groove (7) of the outer ring (8) of the bearing (2) at an angle (15 ) deviating from the radially extending groove center axis (16) in a range between 90 degrees and 0 degrees, particularly preferably between 90 degrees and 30 degrees, is pivotable. Sealing unit (1) according to one of the preceding claims, characterized in that the first fastening projection part (9) designed as a nose (12) has an annular circumferential undercut (17). Sealing unit (1) according to one of the preceding claims, characterized in that the second fastening projection part (11) has two support projections (18, 19) formed coaxially around an axial central axis of the sealing unit (1). Sealing unit (1) Claim 4 , characterized in that the carrier element (3) is L-shaped when viewed in cross section, with a first carrier element leg (20) directed axially inward and a second carrier element leg (21) directed radially inward in the assembled state of the sealing unit (1) , wherein the two support projections (18, 19) of the second fastening projection part (11) are arranged on different sides of the longitudinal axis (22) of the first support element leg (20). Sealing unit (1) according to one of the preceding claims, characterized by a third fastening projection part (23) which, in an assembled state of the sealing unit (1), is supported outside the annular groove (7) radially outward against the outer ring (8). Sealing unit (1) Claim 6 , characterized in that the third fastening projection part (23) has at least one annular circumferential support projection (24), preferably two annular circumferential support projections (24) arranged coaxially to one another. Sealing unit (1) according to one of the preceding Claims 6 or 7th , characterized in that the third fastening projection part (23), viewed in the radial direction, is arranged below the first fastening projection part (9) and above the second fastening projection part (11). Plain bearing with an outer ring (8) and an inner ring (25) and comprising a sealing unit (1) according to one of the preceding claims. Method for assembling a sealing unit (1) designed according to one of the preceding claims in the outer ring (8) of a bearing (2), characterized by the following steps: - providing an outer ring (8) of a bearing (2) having an annular groove (7), - Providing a sealing unit (1) according to one of the preceding claims, - pressing in the sealing unit (1) by an axially directed force on the sealing unit (1) and / or the outer ring (8).

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