DE102008017409A1 - Sealing arrangement for bearing, particularly roller bearing, has two sealing sections, which are arranged or formed to rotate or pivot relative to each other around common rotation axis - Google Patents

Abstract

The sealing arrangement has two sealing sections (10,11), which are arranged or formed to rotate or pivot relative to each other around a common rotation axis. The sealing elements together form a contact free labyrinth sealing section (12), where the sealing elements are aligned in an axial direction. Lip sections (13,14,15) rotate around a rotation axis, which are arranged to overlap in radial direction. An independent claim is included for a wheel bearing for a vehicle.

Description

Field of the invention

The Invention relates to a seal assembly z. For example Bearing, in particular a rolling bearing, with a first sealing portion and with a second sealing portion which is relative to each other a common axis of rotation rotatable and / or arranged pivotably and / or formed, wherein the first and the second sealing portion together a non-contact labyrinth seal section form, wherein first and second sealing portion respectively at least a projecting in the axial direction and the axis of rotation encircling Have lip portion which overlaps in the radial direction are arranged. The invention also relates to a wheel bearing with this Seal assembly.

The Sealing of rolling bearings against environmental influences is necessary in many applications to ensure adequate life of the rolling bearing. For example, it is in wheel bearings indispensable for vehicles that are in the wheel fasteners arranged rolling bearings against splashing water and other contaminants in daily use.

Usually Become contact seals for this purpose used, which for example in the design of cassette seals are known, which are used in the bearings as a seal set can be. In the cassette seals are usually one to two in the axial direction and one to two in the radial direction Positioning touching sealing lips positioned.

From the publication DE 1 008 061 a shaft seal is known in connection with a rolling bearing, which serves as a sealing element for preventing oil leakage. One of the exemplary embodiments shows a sealing arrangement for a radial rolling bearing, wherein the sealing arrangement has an inner and an outer sealing section which each have a jagged cross-section in the radial direction projecting projections, which mesh and thus form a non-contact labyrinth seal.

Probably the closest prior art is the document DE 10 358 876 A1 , which relates to a seal with non-contact arranged Abweisringen. This seal is equipped with two mutually concentric about a common axis of rotation and thereby contactless arranged Abweisringen. At least two axially adjacent radial ribs are formed on a first deflecting ring, wherein the radial ribs are arranged contactlessly with respect to the second deflecting ring. At least one annular first cavity is formed between the two axially adjacent radial ribs and the second deflecting ring. In the embodiment according to the 3 Radialrip pen of the first and the second Abweisrings are shown nested in the radial direction.

Of the Invention is based on the object, a seal assembly as well to propose a wheel bearing with the seal order, which is a high integration capability and / or low production costs allows.

These Task is performed by a seal assembly with the characteristics of Claim 1 and with a wheel bearing with the features of the claim 17 solved. Preferred or advantageous embodiments The invention will become apparent from the dependent claims, the following description and the attached figures.

in the Under the invention, a seal assembly z. For example a bearing or rolling bearing, preferably for a Radial bearing, in particular for a ball bearing and / or tapered roller bearing, in particular for a wheel bearing of a vehicle, with a first sealing portion and with a second sealing portion, the relative to each other about a rotation axis rotatable and / or pivotable arranged and / or trained, proposed. In general the seal assembly according to the invention can be everywhere be used where an exposure to liquids is to be expected, especially in agriculture or forestry Machines, e.g. B. at sorting machines, plowing, stationary Machines, etc., in construction, z. Mixers, in particular concrete mixers, Silo, conveyor systems, etc., in hydraulic engineering, such. B. weirs, hydraulic engineering etc. In further embodiments, the sealing portions not or not directly through a warehouse with each other coupled, but stored independently. The Sealing portions are made of a sealing material, in particular Plastic optionally with reinforcements, manufactured and preferably each disposed on a support, wherein a first support with a first ring of the rolling bearing and a second carrier connected to a second ring of the rolling bearing and / or are connectable, the rings of the rolling bearing over Roll rolling elements against each other.

The first and the second sealing portion together form a non-contact labyrinth seal portion, which in particular completely surrounds the axis of rotation so as to form a fluidically open channel in or against the sealing direction. The sealing effect of the labyrinth seal portion is thus not through a touching sealing area, but over the Geomet Reach the sealing sections or the flow resistance.

Of the each of the first and second sealing portions is at least a projecting in the axial direction, in particular directed and the rotation axis circumferential lip portion, which in radial Direction overlapping and preferably immediately adjacent are arranged to each other, so that these together an annular Form cavity or space. Preferably, the lip sections in a lying in an axial plane longitudinal section in Circulation direction on a constant profile and / or are annular or ring-like design. In particular, the Lip portions of the first and second seal portion preferably interleaved in cross-section in an interleaved manner.

in the Under the invention, it is proposed that the lip sections formed in longitudinal section as finger-like projections are. The longitudinal section is preferably in a plane placed, in which also lies the axis of rotation. Under a finger-like extension is preferably understood an extension, which in the longitudinal section on the radially oriented top and the bottom in the same direction is curved. Preferably, the curvature at the top and / or the bottom a maximum of one turning point on. Preferably, each finger-like extension is single-ended and / or unbranched and / or with exactly one pointing in a radial direction end educated.

It is a consideration of the invention, a seal assembly to create which is compact and easy to manufacture. Preferably, as also substantiated by the subclaim is, the lip sections are formed that the sprayed Sealing sections in a Entformrichtung, which parallel to Orientation of the axis of rotation is arranged, from a one-piece Tool half can be removed. By the simplified shape of the lip sections makes it possible a production of multi-part mold halves to avoid and in this way on the one hand tool costs and to minimize other manufacturing costs. Furthermore, the seal arrangement due to the non-contact labyrinth seal section with alternating troughs a low friction in the dynamic Operation with good sealing properties both in static and in dynamic operation.

Out On the same grounds, it is preferable that the Lip sections in cross section a maximum Entformwinkel of less than 80 °, preferably less than 45 °. The Entformwinkel is defined so that this surface, which parallel to the axis of rotation and / or to the Entformrichtung arranged are 0 °.

From From a functional point of view it is preferred that the labyrinth seal portion is formed so that at a stationary, ie non-rotating or non-pivoting sealing arrangement penetrating in an overhead region of the seal assembly Liquid collected from the lip sections and / or is derived in the direction of rotation. In particular, the lip sections the two sealing sections arranged so nested to each other, that penetrating liquid from a first lip portion the first seal assembly at overflow to a first Lip portion of the second seal assembly and - optionally - of the first section of the second sealing arrangement at overflow to a second lip portion of the first seal portion is continued. At least one, preferably a few, In particular, all of the lip sections has or have a collecting possibility on which a further flow of the liquid prevented or at least slowed down to the next section. Preferably, the labyrinth seal portion is configured to that the liquid from the lip sections in the circumferential direction is derived. The shaping of at least one of the lip sections preferably has means for collecting or storing and / or for draining off the liquid.

Around not only a penetration of the liquid into the seal arrangement, but also a discharge of the liquid from the seal assembly to facilitate or support is preferred provided that the seal arrangement is formed in one down-lying area of the seal assembly - also in a static state of the seal assembly - penetrated Discharge liquid in the radial direction. It is it is particularly preferred if the formed in the underlying area Derivative a monotone, especially strictly monotone decreasing History has.

at A preferred embodiment of the invention is provided that in a dynamic state of the seal assembly, so if at least one of the seal sections rotates, liquid penetrated in the radial direction, in particular without collecting areas through the Centrifugal force is derived.

Preferably, it is thus provided that the lip portions are arranged and / or formed such that their walls on the one hand have a slope, which preferably makes penetration to a maximum difficult, but preferably maximally facilitates the outflow. In particular, at no point should a "water bag" be created which retains the liquid when it flows out of the warehouse. In the static case - the bearing does not turn - only the described static effect is effective. In the dynamic case - the bearing rotates - additionally a centrifugal effect of the rotating part acts whereby a squat liquid is conveyed to the outside.

at a preferred constructive realization of the invention has at least one, preferably some, in particular all lip sections one, preferably at most one, radially outwardly open, circumferential gutter on. The gutter serves for a Stagnation of the penetrating liquid and the other as a drainage device for penetrated liquid from an overhead area to a lower area the seal arrangement.

at A preferred embodiment of the invention are the collection volumes the gutters of different lip sections and / or the extension angle the lip sections in longitudinal section opposite the axis of rotation in the radial direction to the axis of rotation becoming smaller educated. This training reflects the desire to to realize the seal arrangement as small as possible, and second, the realization that the amount of invaded Liquid in the radial direction, ie in the sealing direction, steadily getting smaller.

considered one, some or any lip portion of the one Sealing section in longitudinal section, so this is with its free end immediately adjacent to a metal or Sealing arranged, which the opposite Seal section is assigned.

there It has proven to be advantageous if the shortest open distance between the free end and the metal or sealing area at least 0.1 mm and / or at most 1 mm. This magnitude allows on the one hand only a small penetration of liquid in the seal assembly and on the other a sufficient leakage with static or dynamic load. In particular, will ensured by the distance that the free end and the Do not touch the sealing area as this - im Case of a plastic sealing area and a plastic sealing lip - too unpleasant acoustic emissions during operation.

at a possible structural design of the invention the lip portions are tapered in cross-section towards the free end educated. This training facilitates demolding on the one hand from the tool, on the other hand are areas with the gutter stronger than the tip of the lip section.

at a development and / or a new object of the invention, which relates to the previously described sealing arrangement or the preamble of claim 1 in combination of any or any combination of those previously described or in the subclaims listed features is formed, the seal assembly is as a cassette seal realized.

The Cassette gasket is preferably characterized in that this as an assembly in or on the protected Warehouse can be inserted or used. Preferably, the cassette seal an outer and an inner angled ring, in particular in each case an angle ring on which the first or the second sealing portion is fixed. Optionally be arranged in one of the angle rings further functional elements such as an ABS sensor disk or a centrifugal disk.

at an advantageous embodiment of the invention, the seal assembly in addition to a radial seal, which preferably the labyrinth seal section fluidly serially is downstream and on one of the angle rings and / or on one Axis or shaft touches touching. These also static sealing radial seal increases the wading ability the seal assembly, which, for example, in the use of the seal assembly in conjunction with wheel bearings on vehicles often times as necessary is considered.

at A next development of the invention will be the free Ends of the lip portions bevelled so that the open gap between the free end and the metal or sealing area the opposite sealing portion from radially outside extended radially inward. This funnel-shaped configuration on the one hand hinders the penetration of liquid, for others, the flow of liquid is facilitated. Together with gravity and / or centrifugal force is the penetrated liquid reinforced to the outside dissipated.

When Further optional training can be provided that the surface the sealing portions provided with a structure or coating which is the outflow of fluid radially outward supports the influence of fluid radially inside but obstructed and / or trained directionally selective. The structure preferably has a period of less than 0.1 mm. For example, the structure as a circumferential minirillen or Grooved portions may be formed.

Other features, benefits and effects The invention will become apparent from preferred embodiments of the invention and the accompanying drawings. Showing:

1a , b is a schematic longitudinal section of a cartridge seal as a first embodiment of the invention;

2a , b is a schematic longitudinal section of a cartridge seal as a second embodiment of the invention;

3a , b is a schematic longitudinal section of the cassette seal in the 1a in the static or dynamic state to illustrate the sealing effect;

4a , b is a schematic longitudinal section of a cassette seal as a fourth embodiment of the invention in the static or dynamic state for illustrating the sealing effect.

5 a detail of a cassette seal according to any one of the preceding figures.

each other corresponding or equal parts are each corresponding to each other or the same reference numerals.

The 1a shows a first embodiment of the invention in the form of a cassette seal 1 , Such a cassette seal is used as a sealing arrangement, for example in wheel bearings, in particular ball bearings or tapered roller bearings. The axial width d of the cassette seal 1 is for example between 3 and 5 mm, preferably between 4 and 4.7 mm. In the 1 is the cassette seal 1 in a longitudinal sectional view in a plane coplanar with an axis of rotation of the cartridge seal, not shown 1 shown.

The cassette seal 1 has an outer angle ring 2 and an inner angle ring 3 each of metal, which is concentric and / or coaxial with the outer angle ring 2 is arranged. In this example, the outer angle ring 2 as a stationary or stationary angle ring and the inner angle ring 3 designed as a rotating angle ring. In general, it is preferable that the angle ring rotates with the larger number of lip portions and the angle ring with the smaller number of lip portions is stationary.

The outer angle ring 2 lies with a radially outer cylindrical surface 4 to a receiving geometry, which is formed by an outer ring of a bearing, not shown, or a connecting structure to this outer ring. The inner angle ring 3 lies with an inner cylindrical surface 5 indirectly or directly on an inner ring of the bearing. Inner ring and outer ring are mounted to each other via rolling elements, which roll on the rings. For sealing the outer angle ring 2 opposite the outer ring, not shown, is a circumferential corner seal 6 intended.

To the outer angle ring 2 is a first sealing body 7 arranged, for example, sprayed, and connected to this form-fitting. At the inner angle ring 3 is a second sealing body 8th arranged, which optionally with a disk body 9 , which is formed for example as an ABS disc, is integrally connected.

The first seal body 7 has a first sealing portion 10 on, which with a second sealing portion 11 cooperates contactlessly, wherein the sealing portions 10 . 11 together a labyrinth seal section 12 form. The labyrinth seal section 12 forms a radially open in the radial direction and / or uninterrupted area, which the sealing effect by the geometry of the sealing portions 10 . 11 or through the seal sections 10 . 11 realized columns formed.

The first sealing section 10 has two lip portions projecting in the axial direction 13 . 14 in which a third lip section 15 of the second seal portion 11 intervenes. The lip sections 13 . 14 . 15 are arranged overlapping and / or interleaved in the radial direction, in particular such that they engage in a fir-tree-like manner. Each of the lip sections 13 . 14 . 15 forms a circumferential gutter 16 . 17 respectively. 18 out, which is open radially outward. The lip sections 13 . 14 . 15 are each formed finger-like in the illustrated longitudinal section and extend approximately at a 45 ° angle to the axis of rotation, not shown. The lip sections 13 . 14 . 15 are tapered in cross-section towards the free end. Between the free end of the first lip section 13 and the sealing portion 11 becomes an annular gap with a shortest width of d1, between the third lip portion 15 and the first sealing portion 10 an annular gap with a shortest distance d2 and between the second lip portion 14 and the second sealing portion 11 a third annular gap is formed with the shortest distance d3. The widths d1, d2 and d3 are greater than 0.1 mm and / or less than 1 mm formed. In particular, it is pointed out in this and the following exemplary embodiments that the free ends of the lip sections 13 . 14 and 15 each adjacent to the opposite seal body 7 respectively. 8th are arranged and thus plastic is directed against plastic.

The free ends of the lip sections 13 . 14 and 15 are beveled such that the gap d1, d2 and d3 expands from radially outward to inside, so that there is a funnel-shaped opening in the longitudinal section shown.

On the first seal body 7 is radially in addition a radial sealing lip ring 19 molded, which on the inner angle ring 3 touchingly and sealingly rests. The radial seal lip ring 19 serves to seal penetrating fluid from radially outside.

The 1b shows a second embodiment of the invention in a similar representation. Compared to the first embodiment in the 1a are in the embodiment in the 1b the lip sections 13 . 14 . 15 arranged opposite. So are the lip sections 13 . 15 the second sealing portion 11 and the lip section 14 the first sealing portion 10 assigned.

The 2a shows another cassette seal 1 as a third embodiment of the invention, wherein in comparison to the first embodiment in the 1a the first sealing body 7 is formed deviating in the radially outer region. In the mentioned direction closes to the first sealing portion 10 an interior lining 20 in one piece, which the outer angle ring 2 completely lined inside. The first sealing section 10 facing surface of the interior trim 20 is curved in the longitudinal section shown. Likewise, the radially outwardly facing top 21 of the second seal body 8th formed curved. The bends are arranged so that, as will be explained later, a slanted spout for liquid results.

The 2 B shows in the same representation as the preceding figures, a fourth embodiment of the invention in the form of a cassette seal 1 Which essentially the embodiment in the 1b corresponds, but in addition an interior lining 20 has analogously to the third embodiment.

The 3a illustrates in a schematic longitudinal sectional view of the operation of the cassette seal 1 of the 1a in a static state, so non-rotating. The cassette seal 1 is shown standing, so that in the longitudinal section is shown an upper lying and a lower lying area. Liquid, which via an inlet ring gap 22 in the overhead area of the cassette seal 1 enters, is in the first trough 16 collected. If the liquid continues to increase, it may overflow the first channel 16 come, so that the overflowing liquid in the gutter 17 or after another overflow in the gutter 18 collects. The gutters 16 . 17 respectively. 18 are formed circumferentially, so that due to gravity, the liquid penetrated flows radially around the circumference and over the undersides of the lip portions 13 . 14 respectively. 15 through the inlet ring gap 22 is discharged again. It should be noted that the geometry or structure of the seal assembly is formed so that in the overhead area, as in the 3a shown above, penetrating liquid is retained and in an underlying area, as in the 3a down, is discharged without storage space. In particular, it should be pointed out that the derivative takes place via a path which is monotone or even strictly monotonically decreasing. Complemented in the embodiment in the 3a in addition the inner lining 20 from the 2a , so even the outlet is in the region of the inlet ring gap 22 realized in a monotonically decreasing manner. To maximize this effect are the annular gaps between the lip sections 13 . 14 . 15 and the opposite sealing body in the illustrated cross-section funnel-shaped, wherein the funnel is open radially inward, so that inflow difficult and outflow is facilitated.

The 3b shows the embodiment in the 3a schematized in a dynamic state, with the inner angle ring 3 rotates, so with a rotating shaft. The penetrating liquid gets in the gutter 16 captured. As soon as she breaks the gap at the edge of gutter 16 reaches, it gets to the rotating part of the second seal section 11 and is thrown outwards. Liquid already in gutter 17 is supported by the centrifugal force to the outside. Liquid in the gutter 18 is either sucked along or runs over the surrounding gutter 18 into the gutter 17 and then thrown out. The two in the 3a and 3b shown effects are superimposed in the dynamic case.

The 4a and 4b show a further embodiment of the invention, wherein through the radial seal 19 another channel 23 is formed. In this example, the cartridge seal points 1 with rotating inner ring thus two static 17 . 23 and two dynamic 16 . 18 Gutters up. The 4a shows the cassette seal 1 with standing wave. Like in the 3a The penetrating liquid is at the top of the seal from the gutters 16 . 17 . 18 . 23 collected and flows down over the side edges down. Again, the walls are designed so that an unobstructed outflow is guaranteed. In the 4b is the cassette seal 1 of the 4a shown rotating shaft. The penetrating liquid gets in the gutter 16 immediately thrown off again and passes over the outer angle ring 2 for the most part to the outside. A small part gets into the gutter 17 and flows down there, where the process is analogous to the static case. The gutters 18 and 23 are connected to catch the case of high loading of the seal assembly further penetrated into the seal chamber liquid.

The 5 shows a detail of any of the preceding embodiments of the invention in the region of the free end of a lip portion 13 . 14 . 15 , To further support the retention or recirculation of liquid infiltrated is a fine structure - in the example shown as mini grooves 24 - With directivity on the free surfaces, such. B. against the free ends of the lip portions 13 . 14 . 15 or on the top 21 applied to complicate the ingress of liquids and to facilitate leakage.

1

cassette seal

2

outer angle ring

3

internal angle ring

4

outer Cylinder surface

5

inner Cylinder surface

6

corner seal

7

1. seal body

8th

Second seal body

9

washer body

10

1. sealing section

11

Second sealing section

12

Labyrinth seal part

13 14

1., 2nd lip section

15

Third lip portion

16 17, 18

collecting channel

19

Radial sealing lip

20

interior panelling

21

top

22

Admission annular gap

23

Further gutter

24

Mini groove

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 1008061 [0004]
• - DE 10358876 A1 [0005]

Claims (17)

Sealing arrangement ( 1 ) z. B. for a bearing, in particular a roller bearing, with a first sealing portion ( 10 ) and with a second sealing section ( 11 ) which are rotatable and / or pivotable relative to each other about a common axis of rotation and / or are arranged and / or formed, wherein the first and the second sealing portion ( 10 . 11 ) together a non-contact labyrinth seal section ( 12 ), wherein first and second sealing portion ( 10 . 11 ) each have at least one axially directed in the axial direction and the rotation axis circumferential lip portion ( 13 . 14 . 15 ), which are arranged overlapping in the radial direction, characterized in that the lip sections ( 13 . 14 . 15 ) are formed in longitudinal section as finger-like projections. Sealing arrangement ( 1 ) according to claim 1, characterized in that the lip sections ( 13 . 14 . 15 ) are formed such that the sealing sections ( 10 . 11 ) can be removed in a Entformrichtung in alignment of the axis of rotation of a one-piece mold half. Sealing arrangement ( 1 ) according to claim 2, characterized in that the lip sections in cross section have a maximum Entformwinkel of less than 80 °, preferably less than 45 °. Sealing arrangement ( 1 ) according to one of the preceding claims, characterized in that the labyrinth seal section ( 12 ) is designed such that in a static state of the sealing arrangement in an overhead region of the sealing arrangement ( 1 ) penetrating liquid from the lip sections ( 13 . 14 . 15 ) is collected and / or derived in the direction of circulation. Sealing arrangement ( 1 ) according to one of the preceding claims, characterized in that in a static state of the sealing arrangement in a lower region of the sealing arrangement ( 1 ) liquid is discharged in the radial direction. Sealing arrangement ( 1 ) according to claim 5, characterized in that the derivative formed by the labyrinth seal portion in the underlying region has a monotonous, in particular strictly monotonous sloping slope. Sealing arrangement ( 1 ) according to any one of the preceding claims, characterized in that in a dynamic state of the sealing arrangement penetrated liquid is discharged in the radial direction without collecting areas. Sealing arrangement ( 1 ) according to one of the preceding claims, characterized in that the lip portions each have one, preferably a maximum, a radially outwardly open circumferential collecting gutter (US Pat. 16 . 17 . 18 . 23 ) form. Sealing arrangement ( 1 ) according to claim 8, characterized in that the collecting volumes of the collecting channels ( 16 . 17 . 18 . 23 ) of different lip sections ( 13 . 14 . 15 ) become smaller in the radial direction to the axis of rotation. Sealing arrangement ( 1 ) according to one of the preceding claims, characterized in that in cross-section the free end of the lip sections ( 13 . 14 . 15 ) is arranged immediately adjacent to an opposite metal or sealing area. Sealing arrangement ( 1 ) according to claim 10, characterized in that in longitudinal section the shortest open distance between the free end and the metal or sealing region is at least 0.1 mm and / or at most 1 mm. Sealing arrangement ( 1 ) according to one of the preceding claims, characterized in that the lip portions are formed in a longitudinal section to the free end tapering. Sealing arrangement according to one of the preceding claims or according to the preamble of claim 1, characterized in that the sealing arrangement as a cartridge seal ( 1 ) is trained. Sealing arrangement ( 1 ) according to claim 13, characterized in that the cassette seal ( 1 ) an outer and an inner angled ring ( 2 . 3 ), in particular an angle ring, on which the first or the second sealing portion ( 10 . 11 ). Sealing arrangement ( 1 ) according to one of the preceding claims, characterized by a contacting radial seal ( 19 ), which preferably the labyrinth seal section ( 12 ) is fluidly connected in series. Sealing arrangement ( 1 ) according to one of the preceding claims, characterized in that free surfaces of the sealing sections ( 10 . 11 ) have a macrostructure which impedes the penetration of liquid and / or supports a discharge of liquid. Wheel bearing for a vehicle, characterized by a seal assembly according to any one of the preceding claims.