DE102011121281A1 - Mouth or claw-shaped gap seal - Google Patents

Abstract

The invention relates to a gap seal (16) for sealing a bearing gap (2) present between mutually rotatable bodies (1; 3), in particular for sealing the bearing gap (2) against mutually rotatable rings of a rolling bearing or a rotary joint, for example a roller, barrel , Cylinder, needle, cone or ball slewing or even a combination bearing or even a four-point bearing, with at least two a second body (3) at least pointwise, but preferably flat, touching sealing lips (6; 7; 21) each at least one sealing mouth side or at least one sealing claw finger (12; 13; 22) each, the at least two sealing lips (6; 7; 21) and their sealing jaw sides or sealing claw fingers (12; 13; 22) starting from the sealing center point (14) in the direction of the second body extend and is characterized by the fact that there is also: a) at least one in a first body (1) na for example, completely insertable mounting lug (8) for fixing the gap seal (16) on the first body (1), in particular for at least positive fastening by insertion into an elongated recess or groove (4) in the first body (1), for example along along the groove (4) introduced cross-sectional widenings (5) or barbs (5), b) at least one on the first body (1) surface conformable sealing extension (19), in particular which is slightly inclined relative to the first body (1) surface, in particular which is resilient c) a seal center (14) at the intersection of two main axes (17; 18).

Description

The invention relates to a gap seal for sealing a present between mutually rotatable bodies bearing gap, in particular for sealing the bearing gap against each other rotatable rings of a rolling bearing or a rotary connection, such as a roller, barrel, cylinder, needle, cone or ball slewing or even one Combination bearing or even a four-point bearing according to the claims.

In-use seals for slewing rings, rolling bearings, slewing bearings and slewing drives are very different in their shape and design, although the application is often very similar. The task of encircling sealing devices for rotary joints and bearings is safe to protect the rotary joint or the slew drive against external influences, such as moisture, drift sand or contaminants or dirt, foreign bodies, et cetera. At the same time, the seal must provide support that the lubricant remains in the bearing or only comes from the overall arrangement in small and defined quantities. So it must be able to withstand the internal pressure of the bearing, caused by the lubricant, to a reasonable extent. In both cases, the expert speaks of the sealing effect of the seal.

According to the prior art commercially available and in-use seals for rotary joints and bearings are vulcanizable and made of elastic rubber-like materials, such as FPM, NBR, ECO, HNBR. It can be used in addition to the seal and reinforcing stiffening elements, such as tension spring strands.

The usual sealing arrangements according to the prior art has in common that they are usually carried out either one-piece or multi-part, which means consist of at least one sealing component. Very often, different annular sealing strands are introduced into the rotary joint or fastened in one or more recesses or grooves in the solid material of the rotary joint or on the swivel drive, so that a fixation takes place. The fixation is done by introducing the elastic sealing material in an existing in the (metallic) solid material of the sealed assembly groove. This groove is sometimes referred to as Einichnut or shape recess and is a material recess or recess corresponding to a groove-shaped Ausnehmungsprofiles in the body / solid material. In most cases, this groove is produced by machining as a result of the so-called puncture rotation during the production of the rotary joint or the swivel drive.

For example, describes the EP 1920176 , based on the DE 10 2005 041 720 an arrangement for sealing a rotating connection, wherein the sealing arrangement consists of approximately a total of more than four individual components, each extending annularly and in which the sealing ring is fixed to one of the rotating parts in the above-mentioned manner.

The DE 20203372 on the other hand describes inter alia a seal assembly for a pivot bearing, which achieves a good sealing effect due to their strong asymmetric geometry in conjunction with an additional ring element made of a different material. Again, the strong asymmetric geometry of the sealing profile is fixed to one of the rotating parts in the above-mentioned manner. The DE 10 2006 053 832 deals with the use of an arrangement for sealing two mutually rotatable parts, which uses a spring or a Zugfederband as an additional component, and in which the sealing ring is fixed to one of the rotating parts in the above-mentioned manner.

Common to these conventional seal geometries is that the type of fixation has a great influence on the sealing effect of the seal. It is frequently observed that seals slip out of the fixation during operation, in particular after a longer period of operation, and thus no longer fulfill their purpose. The better the fixation of the seal or seal assembly would be, the less chance of unwanted loss of the seal.

For this problem mentioned, the object initiating the invention to provide a seal geometry for gap seal with the simplest possible profile, which can be very well fixed, but at the same time easy to attach to Wälzlager- or rotary joint product or sealing gap, and still achieved good Abdichtwirkung. The gap seal should also be ideally suited as a retrofit seal. The solution succeeds in particular with the inventive gap seal according to the further description and according to the claims described below.

According to the invention, the gap seal on relatively simple geometry and is in one piece, as in the retrofit case consuming, especially multi-part, sealing complexes can be mounted only with increased assembly costs. A two-lip gap seal is sufficient for this purpose, a three- or mehrlippige gap seal brings more advantages. In a further advantageous Embodiment of the invention can therefore find more than two sealing lips application.

The gap seal according to the invention for sealing a present between mutually rotatable bodies bearing gap, in particular for sealing the bearing gap against each other rotatable rings of a rolling bearing or a rotary connection, for example, a roller, barrel, cylinder, needle, cone or ball slewing or even a combination bearing or even a four-point bearing, has at least two a second body at least pointwise, but preferably flat, touching sealing lips, which in turn each have at least one sealing jaw side or at least one sealing jaw fingers. In this case, the at least two sealing lips and their Dichtungsmaulseiten or Dichtungsklauenfinger extending from the seal center in the direction of the second body.

Characteristic of this gap seal according to the invention is that at least one fastening attachment for fixing the gap seal to the first body is provided, at least one attachment in an elongated recess or recess groove in the first body, for example, along at least Groove groove introduced cross-sectional extensions or barbs. Furthermore, given is at least one of the first body surface conformable sealing extension, in particular which is slightly inclined relative to the first body surface, in particular which resiliently conforms to this surface. Likewise, given by the invention, lying in the profile of the gap seal seal center at the intersection of two extending through the seal major axes.

As particularly advantageous turns out, when the seal assembly has a balanced geometry, which allows a tight fit and thus good fixation as close to the (rotary) body. As a result, the location of this seal center is of particular importance.

The gap seal according to the invention has a fastening lug, which can be inserted almost completely into a first body, for fixing the gap seal to this first body, in particular a rotary body.

By squeezing the gap seal and pressing or pressing into the groove or in the groove or in the Materialausnehmung / recess in the first body, the seal is fixed there. With cross-sectional spacers or barbs inserted along the recess profile or puncture, the gap seal is secured against easy re-extraction.

Furthermore, the gap seal according to the invention has a sealable on the first body surface sealing extension, which is for example slightly inclined relative to the first body surface, and which resiliently clings to the surface of this first body or can create.

This first body is, for example, the inner ring or the outer ring of a slewing bearing or a rotary joint - or even a swivel drive. A second body is to each bearing against rolling bearing ring.

Furthermore, the invention has at least two sealing lips touching this second body. These sealing lips touch, at least pointwise, but preferably flat, with at least one sealing jaw side or at least one sealing jaw finger each of these second body, in each case on its surface. It is advantageous in the context of the invention, if at least one sealing jaw side or at least one sealing claw finger of a sealing lip projects, at least partially, into the sealing gap, while the at least one other sealing lip surrounds the joint region from the other side.

Thus, at least two, possibly also three or more, sealing jaw sides or sealing claw fingers extend from the first body in the direction of the second body, starting from the direction of the center of the seal.

This seal center is located at the nearly right-angled crossing point of both imaginary axes, which divides the attachment approach in the horizontal extent, preferably approximately half, for example symmetrically, and on the other the sealing extension in the vertical extent divides, preferably also about half.

The gap seal according to the invention for sealing one against one another is characterized, among other things, by sealing lips starting from the foot or throat of the sealing jaw, in particular approximately maw-like or claw-like, against at least two corresponding surfaces of the second body or snugly, in particular in each case resiliently or elastically create or nestle on these surfaces.

The embrace of the shock is thus in the way in which a mouth comprises the male part of another body. Alternatively, one can imagine that the two sealing lips, in particular their tips or fingers / claws, embrace the male part of a corresponding body.

Comparing the original state, ie the seal according to the invention when not installed, and installation situation, for example as a retrofit seal in the system to be overhauled, ie the seal according to the invention in the installed state, it is disclosed that the direct distance between the tips of the fingers / Claws, ie the points of contact of the sealing jaw or sealing claw fingers on the second body, have a different amount and also different directions: In the installed situation, this distance will take a higher amount and a more clockwise direction than in the unassembled / unmounted (original) )Status.

Also characteristic of the invention is that the throat of the sealing jaw or the sealing claw is arranged starting from the center of sealing at an angle between 0 ° and 90 ° relative to the horizontal axis. Particularly advantageous are angles of preferably between 40 ° and 60 °, or more precisely, between about 45 ° and 50 °.

With regard to the balanced geometry and the tight fit of the gap seal according to the invention, a close and good fixation on the body turns out to be advantageous. For example, this is ensured if the imaginary extension of the axis from the center of sealing point and through the throat of the sealing jaw / the sealing claw hits the joint of the two corresponding surfaces of the second body directly.

In a further embodiment, three or more sealing lips are used with three or more sealing jaw fingers, whereby the ideal sealing effect by means of interaction of all participating sealing lips and their Dichtungsklauenfinger comes about.

Further advantages and design possibilities result in inventive developments of the invention and from the exemplary attached drawings. All drawings show the cut sealing profile as:

1 an embodiment of a gap seal according to the invention with two sealing lips in the original state, ie in unassembled / non-assembled position, with a non-stretched sealing mouth.

2 the same embodiment as 1 a gap seal according to the invention with two sealing lips, but in the installed state, ie in the mounted position, with an elongated sealing mouth or an open sealing claw.

3 a further embodiment of a gap seal according to the invention with three sealing lips in unassembled / non-installed position, with a non-stretched sealing jaw.

4 the same embodiment as 3 with three sealing lips in the installed state, ie in the mounted position, with a stretched sealing mouth or an open sealing claw.

1 such as 2 each have the same gap seal ( 16 ) on vertically upwardly oriented sealing extension ( 19 ), as well with horizontally oriented to the right mounting approach ( 8th ). The sealing effect or sealing effect is achieved by an upper sealing lip ( 6 ), for example, the outlet sealing lip ( 6 ) in conjunction with a lower sealing lip ( 7 ) which as a blocking sealing lip ( 7 ), produced. The purpose of the arrangement is the sealing of a bearing gap ( 2 ). During operation, both sealing lips ( 6 ; 7 ) to the second body ( 3 ), such as the inner ring of a rolling bearing, created or nestled. The points of contact of the sealing lips ( 6 ; 7 ) with this second body are their tips, called upper and lower seal mouth sides ( 12 ; 13 ) or upper and lower sealing claw fingers ( 12 ; 13 ).

These sealing jaw sides ( 12 ; 13 ) or sealing claw fingers ( 12 ; 13 ) to 1 such as 2 lie on the one hand on the first surface ( 9 ), and on the second surface of the second body ( 10 ). The two surfaces of the second body meet in the joint area ( 20 ) of both surfaces to each other. The impact area ( 20 ) is usually in or near the sealing gap ( 2 ), so that the two sealing claw fingers ( 12 ; 13 ) also in the vicinity of the sealing gap in each case the second body ( 3 ) or touch it. The gap seal ( 16 ) is further characterized in the exemplary embodiment in that the sealing jaw throat or sealing claw foot ( 15 ) of this seal ( 16 ) on an imaginary straight line between the joint area ( 20 ) and the seal center ( 14 ) lies. This closes this seal claw foot ( 15 ) with the seal center ( 14 ) and the horizontal axis ( 17 ) enter an angle (α). In the present illustration about 55 °.

The gap seal can be fixed ( 16 ) to 1 such as 2 on the first body ( 1 ), for example, the outer ring of a rolling bearing, by inserting the attachment lug ( 8th ) in a groove / recess shape as a material recess ( 4 ) or in a corresponding recess or Ausnehmungsprofil ( 4 ). The advantage in the fixation mode is provided by additional cross-sectional widening or barbs ( 5 ) in the sealing material, which are provided in recesses provided in groove / recess ( 4 ), which are to be understood as a barb approach or barb abutment in the rotating body, are fitted. Through these cross-sectional widening or barbs ( 5 ), the gap seal ( 16 ) additionally secured against being pulled back in such a way that the cross-sectional widening of the sealing material in the recess ( 4 ) when pulling against the barb approach ( 11 ) in the body (rotary body) are pressed. The sealing material is therefore at the beginning ( 11 ) Direction of the horizontal compressed. Thus, the barb approach counteracts pulling out in the horizontal direction.

Further in 1 such as 2 it can be seen that the seal ( 16 ) has a middle point ( 14 ), in which horizontal axis ( 17 ) and vertical axis ( 18 ) roughly cut. These axes lie in each case in the middle of the attachment approach ( 8th ) or in the sealing extension ( 19 ).

3 and 4 show the embodiment of a gap seal according to the invention ( 16 ) with three sealing lips ( 6 ; 7 ; 21 ). Basically, the same functionality as in 1 and 2 , As an example, the same gap seal ( 16 ) on vertically upwardly oriented sealing extension ( 19 ), as well as with horizontal left-oriented attachment approach ( 8th ). The sealing effect or sealing effect is achieved by a central sealing lip ( 6 ), for example, also an outlet sealing lip ( 6 ) in conjunction with a lower sealing lip ( 7 ) which as a blocking sealing lip ( 7 ), produced. The purpose of the arrangement is the sealing of a bearing gap ( 2 ). During operation, all three sealing lips ( 6 ; 7 ; 21 ) to the second body ( 3 ) or nestled. The points of contact of the sealing lips ( 6 ; 7 ; 21 ) with this second body ( 3 ) are their tips, referred to as seal mouth sides ( 12 ; 13 ; 22 ) or as sealing claw fingers ( 12 ; 13 ; 22 ).

These sealing jaw sides ( 12 ; 13 ; 22 ) or sealing claw fingers ( 12 ; 13 ; 21 ) to 3 such as 4 lie on the one hand on the first surface ( 9 ), and on the second surface of the second body ( 10 ). The two surfaces ( 9 ; 10 ) of the second body meet in the joint area ( 20 ) of both surfaces to each other. The impact area ( 20 ) is also in or near the sealing gap ( 2 ). The gap seal ( 16 ) is also characterized in these figures by the fact that the throat ( 15 ) on an imaginary straight line between the joint area ( 20 ) and the seal center ( 14 ) lies. This closes this seal claw foot ( 15 ) with the seal center ( 14 ) and the horizontal axis ( 17 ) enter an angle (α). Because three sealing lips ( 6 ; 7 ; 21 ), a seal mouth or seal claw foot results ( 23 ), which the sink between the two the gap ( 2 ) at the most distant sealing lips ( 6 ; 21 ).

LIST OF REFERENCE NUMBERS

1

First rotatable body (rotating body), z. B .: rolling bearing ring

2

bearing gap

3

Second rotatable body (rotating body), z. B .: rolling bearing ring

4

Groove groove / recess as material recess or recess or recess profile

5

Cross-section widening or barbs

6

Sealing lip, z. B .: as an outlet sealing lip

7

Sealing lip, z. B .: as a blocking sealing lip

8th

mounting boss

9

First surface of the second body

10

Second surface of the second body

11

Barb approach in the body (rotating body)

12

Seal mouth side or seal claw finger

13

Seal mouth side or seal claw finger

14

Sealant point

15

Seal mouth or seal claw throat

16

gap seals

17

horizontal axis

18

vertical axis

19

Seal extension

20

shock

21

sealing lip

22

another gasket side or seal claw fingers

23

Seal mouth or seal claw foot

24

rounded outer contour

e

extension

A

direct distance

α

angle

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

• EP 1920176 [0005]
• DE 102005041720 [0005]
• DE 20203372 [0006]
• DE 102006053832 [0006]

Claims (14)

Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ), in particular for sealing the bearing gap ( 2 ) against each other rotatable rings of a rolling bearing or a rotary joint, for example, a roller, barrel, cylinder, needle, cone or ball slewing or even a combination bearing or even a four-point bearing, with at least two a second body ( 3 ) at least pointwise, but preferably flat, touching sealing lips ( 6 ; 7 ; 21 ) Which ever at least one sealing jaw side or at least one sealing claw finger ( 12 ; 13 ; 22 ), wherein the at least two sealing lips ( 6 ; 7 ; 21 ) and their sealing mouth sides or sealing claw fingers ( 12 ; 13 ; 22 ) starting from the seal center ( 14 ) extend in the direction of the second body, characterized by: a) at least one into a first body ( 1 ) almost completely insertable fastening lug ( 8th ) for fixing the gap seal ( 16 ) on the first body ( 1 ), in particular for at least positive fastening by insertion into an elongated recess or groove ( 4 ) in the first body ( 1 ), for example with along the groove ( 4 ) introduced cross-sectional enlargements ( 5 ) or barbs ( 5 ), B) at least one on the first body ( 1 ) Surface conformable gasket extension ( 19 ), in particular which is slightly inclined relative to the first body ( 1 ) Surface, in particular which resiliently conforms to this surface, - c) a seal center ( 14 ) at the intersection of two (main) axes extending through the seal ( 17 ; 18 ). Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to claim 1, characterized in that the seal center ( 14 ) in the nearly right-angled crossing point of both (main) axes ( 17 ; 18 ), wherein one of these axes, the attachment lug ( 8th ) in its horizontal extent divides, preferably about half, for example symmetrically, and the other of these axes the sealing extension ( 19 ) in its vertical extent divides, preferably about halfway. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that sealing lips ( 6 ; 7 ) of throat ( 15 ) of the sealing jaw starting, in particular approximately maw or claw-like, at least two corresponding surfaces ( 9 ; 10 ) of the second body or nestle, in particular in each case resiliently or elastically to these surfaces ( 9 ; 10 ) or nestle. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that the direct distance (A) between the points of contact of the sealing jaw or sealing claw fingers ( 12 ; 13 ) on the second body ( 2 ), comparing the installation situation to the original state, different amount and different direction. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that the throat ( 15 ) or the foot ( 23 ) of the sealing mouth, in particular the throat ( 15 ) the gap ( 2 ) at the closest sealing lip ( 6 ; 7 ; 21 ), starting from the seal center ( 14 ) at an angle (α) between 0 ° and 90 ° with respect to the horizontal axis ( 17 ) is arranged, preferably at an angle between 40 ° and 60 °, in particular between about 45 ° and 50 °. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that foot ( 23 ) or the throat ( 15 ) between exhausting sealing lip ( 6 ; 7 . 21 ) is located. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims characterized in that the at least one blocking sealing lip ( 6 ; 7 ; 21 ) in the gap ( 2 ) and / or protrudes into this Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that the at least one outlet sealing lip ( 6 ; 7 ; 21 ) the second body ( 3 ) on its first surface ( 9 ), in particular the horizontal surface, touches or abuts against this surface or conforms to this surface. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that the extension of the axis of seal center ( 14 ) through the throat ( 15 ) of Seal mouth on the push ( 20 ) of the two corresponding surfaces ( 9 ; 10 ) of the second body. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that the cross-sectional enlargements ( 5 ) or barbs ( 5 ) of the gap seal corresponding barb approaches ( 11 ) in the body ( 1 ; 3 ), the barbs ( 5 ) and the barb approaches ( 11 ) fit form-fitting to each other. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that the rounded outer contour ( 24 ) of the entire sealing maw or the entire sealing pawl in the original state has a radius of less than 15 mm, preferably between 4 mm and 10 mm. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims characterized in that the extension (E) of the gap seal ( 16 ) assumes in the original state in horizontal and vertical directions in approximately the same amount, and preferably each smaller than 25 mm, for example, in the horizontal direction about 20 mm and in the vertical direction has about 15 mm. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that the fixing lug ( 8th ) has a smaller dimension than 10 mm, in particular has about 6 mm. Gap seal ( 16 ) for sealing a body rotatable between mutually ( 1 ; 3 ) existing bearing gap ( 2 ) according to at least one of the preceding claims, characterized in that the sealing extension ( 19 ) has a smaller dimension than 10 mm, in particular has about 3 mm.

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