RU2574481C2 - Sealing system for roiling bearing - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to sealing system to seal the rolling bearing, in particular wheel bearing, between the first (30, 32) and second elements (31). Both bearing elements (30, 31, 32) are made with possibility of rotation relatively to each other, and create both axial intermediate space (61), and radial intermediate space (60) relatively to the common axis of rotation. The sealing system includes installation element (14, 24) with fastening part (37, 40) having shape of hollow cylinder to secure element (14, 24) on second element (31), and ring part (41, 43) to position the element (14, 24) on second element (31), secured on the first element (30, 32) of bearing the carrying attachment (39, 45) with elastic element (13, 23), creating the first axial sealing edge (17, 29) and/or radial sealing edge (19, 36). Element (14, 24) is provided to create the first catching groove (12, 22) with the going radially element of the second element (31). End part (34, 44) of element (14, 24) partially limits the hole (50, 51) exiting to the first catching groove (12, 22). Hole (51) is partially limited by continuation (26) of the elastic element (23).

EFFECT: increased service life and efficiency of sealing of the sealing system based on sealing edges, without loss of known properties of existing sealing systems.

9 cl, 2 dwg

Description

FIELD OF THE INVENTION

The invention relates to a sealing system for a rolling bearing, in particular a wheel bearing, between the first and second bearing element, both bearing elements can rotate relative to each other and with respect to the common axis of rotation and form both an axial intermediate space and a radial intermediate space, The sealing system includes the following:

- an installation element with a predominantly hollow cylinder-shaped fastener for fastening and an annular support part for positioning the installation element on the second bearing element,

- a supporting device fixed to the first bearing element with an elastic element forming the first axial sealing lip and / or radial sealing edge, bevel.

State of the art

Sealing systems with abrasive sealing contacts of axial and radial sealing lips are traditionally used to seal a rolling bearing, and both bearing elements to be sealed can be opposite both radially and axially. A similar situation arises in many places in mechanical engineering, for example, in metalworking machines, shafts, and also in the wheel bearings of cars or trucks.

JP 2003-56577 refers to a wheel bearing in which the outer ring, as the first bearing element, must be sealed with respect to the wheel flange. For this purpose, an installation sheet is provided, which both axially and radially abuts the wheel hub, respectively, of the wheel flange and on the abrasive sealing contact, an axial sealing edge and a radial sealing edge are provided, the sealing edges being located on a support device that is mounted on the radial inner side outer ring.

The sealing system of the prior art has the disadvantage in that it is possible for the environment to directly act on the sealing lip from the outside, and the sealing lip material, for the most part elastomer, wears out very quickly. If, for example, a foreign body, such as sand or water, enters, a grinding effect occurs that wears the sealing lip, creates grooves in the mating surface and thereby reduces the pre-tension of the sealing lip.

Disclosure invention

The objective of the invention is to offer an economical solution, which should increase the service life and efficiency of the sealing of the sealing system based on the sealing edges, without losing the known properties of existing sealing systems.

The problem is solved in the sealing system by the fact that a mounting element is provided for forming, with a radially extending element, a second bearing element of the first catching groove, the end part of the mounting element partially restricting the opening extending into the first catching groove.

The hole extends into the first pickup groove to ensure that no foreign particles or the water itself enters the sealing system during the centrifugal skidding process or during the swelling of the water. For these reasons, the hole is mainly oriented in the axial direction and is located opposite the second bearing element, such as, for example, the wheel flange, and also along the axis. The mouth of the hole is radially remote from the bottom of the pressure groove so far that water and dirt particles can be collected in the catch groove and diverted towards the perimeter.

The hole is the beginning of the labyrinth seal, which is made in the form of a preliminary seal, and the labyrinth seal protects the subsequent sealing lips from environmental influences. In this case, the labyrinth seal extends from the opening to the first wearing seal contact and is formed by the various components of the sealing system, inter alia, by the mounting element.

Both bearing elements rotating relative to each other can be, for example, a stationary outer ring and a rotating wheel hub lying inside, or an outer ring provided in the form of a wheel hub, which is mounted on an axial neck. In both cases, a radial and axial intermediate space is formed between the bearing elements.

Advantageously, the mounting member has a hollow cylinder-shaped fastener for mounting and an annular supporting member for positioning the mounting member on the second bearing member. Thus, the mounting element can be mounted easier due to the fact that it, with the hollow cylinder-shaped fastener, is worn on the second bearing element until it abuts against the radially extending element of the second bearing element. The fastener must be fitted with a press fit so that the axial position does not change later. This was harmful in this respect, since the support part would no longer have contact with the second bearing element and thus it would be possible to advance the contaminants to the fastener. Corrosion under the mounting member of the mounting element would thus become more likely.

The support device mounted on the first bearing element has an elastic element forming a first axial sealing lip and / or a radial sealing lip. The radial and / or at least axial sealing lip abut against the mounting element and form a correspondingly wearing sealing contact there. Preferably, the mounting element may then consist of a material which is also a resistant material in the sealing contact, such as stainless materials, alternatively, two axial ones may be provided instead of the radial sealing edge.

The first catching groove is formed by a radially extending element of the second bearing element and an element of the mounting element lying radially outside. To this end, the element lying on the outside can have a cylindrical section and an end piece joining to it, and the end piece should extend mainly radially so that no water penetrates into the hole bounded by the end piece.

Preferably, it forms at least a partial detail of the mounting element forming the first catch groove, a labyrinth seal. The lateral end piece of the mounting element is such a partial part, however, it should not be the only one. In this case, with the help of the installation element, a double function that saves the material is realized.

In a preferred embodiment, the fastener of the mounting element is connected via a predominantly conically formed connecting part to the supporting part of the mounting element. The connecting part may have various shapes, which are preferred on occasion. In any case, the installation of the connecting part is not preferable, since it would be necessary to accurately copy the shape of the second bearing element in terms of its curvature. In this case, the conical shape is leading to the goal. If more space is to be obtained for the sealing system, somewhere for a different contact surface of the sealing lip, a rounded shape of the connecting piece is proposed. In order to increase the seal of the mounting element with respect to the second bearing element, the intermediate space between the connecting part and the second bearing element can be filled with a sealing compound to prevent moisture from entering the rolling bearing at this point.

In a preferred embodiment, a mounting element is provided for radially enclosing the first bearing element, the first bearing element partially forming a labyrinth seal. Thus, the first bearing element also takes on a share in the seal, with which material can be saved. In addition, this embodiment in rolling bearings is preferred with a particularly small axial intermediate space.

In a preferred embodiment, the protective element fixed to the first bearing element forms an opening together with the end part of the mounting element. Ideally, the hole in its radial dimensions is as small as possible to prevent the ingress of water and dirt. In this case, the annular shape of the hole is preferred, for example, in the form of an annular gap, since it requires the lowest manufacturing costs.

In a preferred embodiment, the hole is partially limited by the extension of the elastic element and in another part by the end piece of the mounting element, which both together form the hole. This gives an advantage due to the reduction of structural elements. Like cassette seals, a two-element sealing system with a mounting element and a seal can be realized, since a protective sheet is not needed on the outside of the first bearing element to form an opening, respectively a labyrinth. Instead, an elastic element, such as an elastomer, takes over this function.

In a preferred embodiment, an o-ring is formed on the elastic member. In this case, the sealing ring forms a non-wearing seal of the fastener of the supporting device. In the simplest case, the o-ring could be made in the form of a rubber ring of circular cross-section. The rubber ring of circular cross section can be made in the form of a separate element or firmly connected to the elastic element with the help of material.

The sealing ring in the elastic element forms a so-called static seal, since the fastener of the supporting device and the first bearing element do not rotate relative to each other. This does not exclude that the o-ring can rotate together with the first bearing element and the fastener, as this, in particular, is represented by the application in trucks, as well as in cars, in which the first bearing element is formed by the rotating outer ring of the wheel hub.

In a preferred embodiment, the elastic element, together with at least a partial detail of the mounting element forming the first catch groove, forms at least partially a labyrinth seal. The labyrinth seal is a gap seal, while the seal gap repeatedly changes its own direction of travel. In other words, the labyrinth seal consists of several slots, which although they are connected to each other, however, are oriented in different directions. The shape of the elastic element and the shape of the mounting element are consistent in appearance with each other, so that a labyrinth seal is formed in case of various intercepting elements, such as, for example, a catching groove.

Preferably, the elastic element forms a second catching groove located radially inward with respect to the first pickup groove. In this case, it is preferable that dirt or water entering the labyrinth seal can be intercepted in the second capture groove and at the same time due to the volumetric discharge in the capture groove of the labyrinth seal through the annular gap located in front of the second capture groove and through the hole next to it can exit the labyrinth seals. It is also preferable that the mounting element, which partially forms the first catching groove, also partially forms the said annular gap and, if necessary, radially protects the second catching groove.

Advantageously, the extension partially radially protects the second pickup groove. The extension is formed mainly in the axial direction, so that radial protection of the annular gap or the second catching groove is provided. It is likewise preferable if the extension also partially or completely radially protects the end piece 34. It is ensured that the hole is generally oriented along the axis.

Advantageously, the extension has a tapered or similarly shaped inner surface at the radially outer end of the annular gap so that the penetrated water can easily come out of the labyrinth seal again.

If necessary, the continuation can also form an element of the sealing system lying radially farthest from the outside, so that water on this extension can drip downward, respectively, water falling on top of the sealing system can be held by the first catching groove.

Other preferred embodiments and preferred embodiments of the invention may be taken from the description of the drawings and / or dependent claims.

Brief Description of the Drawings

Below the invention is described in more detail and explained using the embodiments presented in the drawings, which show:

figure 1 - consisting of three elements of the sealing system with a protective element; and

figure 2 - consisting of two elements of the sealing system with a multifunctional elastic element.

The implementation of the invention

Figure 1 shows a three-element sealing system with a protective element 10. The sealing system has a friction-free pre-seal, which is made in the form of a labyrinth seal and is formed by the mounting element 14, the first bearing element 30 and the protective element 10. The protective element 10 made in the form of a sheet treated by pressure in the cold state, and at the end of the hollow cylinder-shaped section 52 there is an annular hole 50, which goes into the first th groove of mounting member 14. Alternatively the security element 10 may also consist of synthetic material or may be made in the form of turned parts. The protective element 10 further has a fastener 47, which by means of a press fit is fixed on the outer surface of the first bearing element 30, made in the form of an outer ring.

The outer ring forms at least an element of the wheel hub 30, with which the protective element 10 becomes a kind of sheet that is discarded by centrifugal force, from which, during rotation, the water radially departs and is kept at a distance from the opening 50. Water and dirt particles, which fall into the fixed first catching groove 12, are transported further in the direction of the perimeter and, under the action of gravity, drip in the vertical direction in the direction of the road surface.

Further, the first catching groove 12 protects the axial intermediate space 61, which, in comparison with existing sealing systems, has become less accessible to water and dirt due to pre-compaction.

In the axial intermediate space 61 is also located at least an element of the support part 41, which is watertight closed by the second bearing element 31. The second bearing member 31 in this embodiment is formed as a fixed axial journal.

A conical connecting part 18 connects the supporting part 41 to the hollow cylinder-shaped fastener 40, which, by means of a press fit, is in particular locked in its axial position so as not to jeopardize the waterproof installation of the supporting part 41. Further, the connecting part 18 forms together with the axial the sealing lips 16, 17 are two wearing sealing contacts that protect the working space of the wheel bearing. All sealing lips 16, 17, 19 are formed in the elastic element 13 and, depending on the sealing effect to be achieved, can be used alone or in any arbitrary combination with each other, respectively. The less sealing lips are used, the lower the coefficient of friction of the sealing system.

The carrier device 45 is anchored 48 by the elastic member 13 in the inner groove of the first bearing member 30. As an alternative, the carrier device 45 itself can be mounted on the inner surface of the first bearing element 30 by means of a cylindrical press fit. The support device 45 and the elastic element 13 together form a sealing ring 11, which can be pressed into the first bearing element 30 in a simple manner. The outer radius of the anchor 46, although larger than the inner radius of the first bearing element 30, can be pressed in without difficulty due to the elastic property of the anchor 46.

The lying radially axial sealing lip 16 forms the first catch groove 15. Water and dirt particles can also exit the first catch groove 15 again due to gravity. This can be supported by the fact that the hollow-cylinder-shaped portions 52 of the protective element 10 and the mounting element 14 on the inner side are at least insignificantly conical, with which a simpler outflow is possible.

Figure 2 shows a two-element sealing system with a multifunctional elastic element 23. The elastic element 23 assumes the function of the protective element 10 in figure 1. For these reasons, the support device 39 of the elastic member 23 is mounted by means of a press fit on the outer surface of the first bearing member 32. In order to prevent corrosion under the fastener 48 of the carrier 39, a so-called static seal is formed using the formed wear-free seal 25 because it has a substantially annular shape and fits radially or well into the outer groove of the first bearing member 32.

If the sealing system is to be used in trucks, the first bearing element 32 corresponds to a fixed outer ring, with which the non-wearing seal 25 is also a fixed seal. In this case, the second bearing member 31 represents the wheel hub with a radially extending member which is formed by the wheel flange.

The protective element 24 is fixed in the same way on the second bearing element 31, as well as the bearing element 41 in figure 1, and, however, the protective element 24 is provided for rotation during operation. In this way, the end part 34 is intended to be a function of the ejector due to centrifugal force, and this centrifugal effect ensures that dirt and water cannot penetrate the opening 51. Preferably, the end part 34 forms a sharp edge, which, due to the slight inclination, moves to end piece 34.

Due to the fact that the hole 51 is oriented along the axis in the direction of the wheel flange, it can preferably be prevented that the radially flowing water enters the labyrinth seal. Advantageously, the extension 26 is formed so that it has a larger outer radius of the sealing system, and dirty water can drip down it. Further, it also protects the annular gap that extends into the second catch groove 27. The annular shape of the gap ensures that penetrated dirt, respectively water, can again exit the labyrinth seal through the opening 51 without difficulty. The second catch groove 27 may form with a non-contacting axial sealing lip , the end of which in the radial direction is directed outward and together with the radially lying inside the bottom of the first catching groove 22 forms another sealing element labir an intrinsic seal in the form of a second annular through hole.

So that the elastic element 23 can take on many functions, it extends from the axial end of the fastening element 48 to the support device 39 lying radially inside the end, and it protects the support device 39 radially outward and is axially located between the mounting element 43 and the support device 39. B Alternatively, the respective functions can also be carried out by separately installed elastic elements, however, this leads to too much manufacturing costs.

The sealing system has an axial sealing lip 29 and a radial sealing lip 36, which together with the mounting element 24, or respectively with the connecting part 38 and the fastener 37 form a wearing sealing contact.

The sealing system of FIG. 2 is located outside the radial intermediate space 60, which is secured by the first bearing member 32 and the second bearing member 31. Advantageously, certain measures are to be taken on the first bearing member 32 that allow the use of a sealing system. These preferably include only the outer groove for the non-wearing seal 25, but not necessarily. In addition, due to the presence of two elements, there are advantages when installing a sealing system, since a separate protective element disappears.

O-ring 21, which includes an elastic element 23 and a bearing device 39, along with the usual sealing functions, takes on the task of at least partially forming a preliminary seal in the form of a labyrinth seal, as well as performing an external static seal with respect to the first bearing element 32 . Also, the mounting element 24, which, just like the supporting device 39, is preferably made of a sheet in a preferred way, takes on other functions to seal over the already known functions of the installation sheet by the fact that it forms a first catch groove in the axial intermediate space 61.

The embodiments in both figures can be applied both to the rotating first bearing element 30, 32 and to the fixed first bearing element 30, 32, that is, the sealing systems proposed in accordance with the invention can equally be used in wheel bearings for trucks, as well as and cars, regardless of whether the corresponding wheel bearing is made for external rotation or internal rotation.

Summarizing, the invention relates to a sealing system for sealing a rolling bearing, in particular a wheel bearing, between the first and second bearing elements, both bearing elements can rotate relative to each other and form both an axial intermediate space and a radial intermediate space with respect to the common axis rotation, and the sealing system includes the following: an installation element with a predominantly hollow cylinder-shaped fastener for fastening and with an annular a supporting part for positioning the mounting element on the second bearing element, and a supporting device fixed to the first bearing element with an elastic element forming the first axial sealing lip and / or radial sealing lip. The technical solution proposed in accordance with the invention shows how the service life and efficiency of a seal can be economically improved. It is proposed that a mounting member with a radially extending member of the second bearing member forms a first pickup groove, the end piece of the mounting member partially defining an opening extending into the first pickup groove. Thus, it is possible to create a labyrinth seal as a pre-seal, which, without additional friction losses, contributes to the seal.

List of items

10 security element

11 O-ring

12 First catch groove

13 elastic element

14 Installation element

15 Second catch groove

16 Axial sealing lip

17 Axial sealing lip

18 Connection piece

19 Radial sealing lip

21 O-ring

22 First catch groove

23 elastic element

24 Security Element

25 Non-wearing seal

26 Continued

27 Second catch groove

28 Radial end piece

29 Axial sealing lip

30 The first bearing element

31 Second bearing element

32 The first bearing element

34 End piece

35 Ring-shaped intermediate piece

36 Radial sealing lip

37 Fastener

38 Connection piece

39 Carrier

40 Fastener

41 Support part

43 Installation part

44 End piece

45 Carrier

46 Anchoring

47 Fastener

48 Fastener

50 hole

51 hole

52 Hollow Cylinder Section

60 Radial intermediate space

61 Axial intermediate space

Claims (9)

1. The sealing system of the rolling bearing, in particular the wheel bearing, between the first (30, 32) and the second bearing element (31), both bearing elements (30, 31, 32) are rotatable relative to each other and form as an axial intermediate the space (61) and the radial intermediate space (60) with respect to the common axis of rotation, while the sealing system contains:
- a mounting element (14, 24) with a hollow cylinder-shaped fastener (37.40) for mounting the mounting element (14, 24) on the second bearing element (31) and an annular part (41, 43) for positioning the ring-shaped mounting element ( 14, 24) on the second bearing element (31),
- a supporting device (39, 45) fixed to the first bearing element (30, 32) with an elastic element (13, 23) forming the first axial sealing lip (17, 29) and / or a radial sealing edge (19, 36), when this
a mounting element (14, 24) is provided for forming, with a radially extending element, a second bearing element (31) of the bearing of the first pickup groove (12, 22), the end part (34, 44) of the mounting element (14, 24) partially defining the opening (50, 51) extending into the first catching groove (12, 22), characterized in that the hole (51) is partially limited by the extension (26) of the elastic element (23). 2. The sealing system according to claim 1, characterized in that at least a partial detail of the mounting element (14, 24) forming the first catching groove (12, 22) forms a labyrinth seal. 3. The sealing system according to claim 1, characterized in that the fastener (37, 40) of the mounting element (14, 24) is connected to the mounting part (41, 43) of the mounting element (14, 24) using a predominantly conically formed connecting part (18, 38). 4. A sealing system according to claim 1, characterized in that the mounting element (14) is made with the possibility of radial coverage of the first bearing element (30), the first bearing element (30) partially forming a labyrinth seal. 5. Sealing system according to one of paragraphs. 1-3, characterized in that the protective element (10) fixed to the first bearing element (30) together with the end piece (44) forms an opening (50, 51). 6. A sealing system according to claim 1, characterized in that a sealing ring (25) is formed on the elastic element (23), which forms a non-wearing seal of the fastener (48) of the supporting device (39). 7. A sealing system according to claim 1, characterized in that the elastic element (23) together with at least one partial part of the mounting element (22) forming the first catching groove (61) at least partially forms a labyrinth seal. 8. A sealing system according to claim 6 or 7, characterized in that the elastic element (23) forms a second catching groove (27) located radially inward with respect to the first catching groove (61). 9. A sealing system according to claim 8, characterized in that the continuation (26) partially radially protects the second catching groove (27).

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