EP2524158A1

EP2524158A1 - Device for fixing elastic elements

Info

Publication number: EP2524158A1
Application number: EP11703376A
Authority: EP
Inventors: Hubertus Frank; Henrik Albertsen
Original assignee: IMO Holding GmbH
Current assignee: IMO Holding GmbH
Priority date: 2010-01-14
Filing date: 2011-01-11
Publication date: 2012-11-21
Also published as: DE102010013742A1; WO2011085955A1; CN102725567A; US20130062833A1

Abstract

The invention relates to a device for sealing a gap (6) between at least two parts (2,3) that are moved with respect to each other, namely a fixing part for fixing at least one elastic sealing element (12) at an edge (15) thereof and a stop part (3,2) on which another edge (16) of at least one elastic sealing element runs. The fixing part has at least one groove (18) running along the gap. One or preferably more anchoring parts (21) are inserted in said groove, said anchoring parts engaging through or around the sealing element and/or a retaining element (24) that retains same.

Description

Device for fixing elastic elements

The invention is directed to a device for sealing a gap between at least two mutually moving parts, namely a fastening part, to which at least one elastic sealing element is fixed with one of its edges, and a starting part, whereupon another edge of at least one elastic sealing element runs along. For the sealing of the gap of mutually moving parts usually linear or annular elastic sealing elements are used, preferably with a substantially approximately flat cross-section, that is, with a band-shaped structure which is bounded by two longitudinal edges. For fixing the same sealing elements with a, preferably widened longitudinal edge in a groove parallel to the gap of one of the two parts to be sealed, hereinafter referred to as fastening part used and thereby fixed, while their opposite longitudinal edge on the other of the two parts, hereinafter referred to as Designated start part, along stretches and thereby closes the gap.

Often, the gap to be sealed between the mutually moving parts is filled with a lubricant, in particular with lubricating grease, which is to be retained by the elastic sealing element. This can usually afford to be used in a groove inserted sealing element. U.U. This lubricant can also be pressurized, which improves the lubrication effect. However, it succeeds as described in a groove anchored by insertion sealing elements rarely to defy the resulting pressure difference; they are literally lifted out of their anvil groove until they yield and release lubricant so that pressure is reduced.

CONFIRMATION COPY From the disadvantages of the described prior art, the problem initiating the invention results in designing a device for fixing elastic elements in such a way that they can withstand a pressure difference of the order of one or more bars without leaking. In addition, the technical complexity of such anchoring should be as low as possible.

The solution of this problem is achieved in that in a generic seal, the fastening part has at least one groove running along the gap, wherein one or preferably a plurality of anchoring parts are used, which pass through the sealing element and / or a holding element holding the same.

With such an arrangement, the invention achieves the actually competing goals of a particularly strong anchoring on the one hand and the lowest possible technical effort on the other hand. In the attachment part is still to provide only one groove; However, it is not necessary to drill individual anchoring holes or even cut threads. The anchoring elements can be prefabricated standardized and hold the elastic sealing element positively.

It has proved to be favorable that the extent of a groove-engaging portion of an anchoring part in the longitudinal direction of the groove is equal to or smaller than twice the maximum width of the groove, preferably equal to or less than one and a half times the maximum width of the groove, whereby in particular the weight such an anchoring part can be minimized.

Such anchoring parts are preferably not placed close to each other, but placed at a mutual distance, for example, with a distance which is greater than their extension in the groove direction, which is preferably twice as large or larger than their extension in Nutrichtung, and in particular at least three or four or even five times as large or larger.

It has been proven that the extension of the core of a groove engaging portion of an anchoring part in the longitudinal direction of the groove corresponds approximately to the groove width. In this case, core means in particular a mathematical body, for example a cylinder, which is inscribed within a surface structure such as a thread, that is to say the anchored body "reduced" around the surface structure.

The invention further provides that an anchoring part is designed as a threaded bolt or screw, preferably as a machine screw, in particular as a machine screw with a self-tapping thread. Such a machine screw can be screwed into the anchoring groove according to the invention transversely to its longitudinal direction, wherein the screw thread cuts the required internal thread sections in the groove flanks automatically. The then intermeshing threaded portions ensure a reliable anchoring of the screw within the groove.

An alternative embodiment is characterized in that an anchoring part is designed as a rivet, in particular as a blind rivet, whose inner head is located in an undercut, that is, with respect to the groove opening widened groove area. The inner rivet head provides a positive anchoring of the rivet within the anchoring groove, while the upper or outer rivet head also engages over the elastic sealing element or a fastening element holding the same form-fitting manner.

An anchoring part may also be formed as a sleeve which is pushed onto a core or pushed. The core stabilizes the sleeve and / or deforms them appropriately during insertion for the purpose of stable anchoring.

The invention can be further developed such that the core expands towards the groove bottom in order to expand a slotted sleeve in the region of the groove base and thereby anchor.

It is within the scope of the invention that a portion of an anchoring part for engagement in the groove has a rotationally symmetrical cross section, possibly with the exception of a thread arranged thereon. Such a structure facilitates the insertion of the anchoring part, since this does not have to be aligned parallel to the Nutlängsrichtung before insertion.

In a particular embodiment, a portion of an anchoring member for engaging the groove has an elongated cross-section which allows insertion upon rotation in the longitudinal direction of the groove and anchoring to an undercut of the groove when rotated transversely to the longitudinal direction of the groove. On the other hand, although the anchoring takes place with a rotary movement, a reliable anchoring with a very high holding force nevertheless results.

An elastic sealing element may be clamped to a surface of the fastening part. This means, for example, that it rests flat with a region of its surface on the surface of the fastening part and frictionally pressed by the anchoring parts against the same and thereby fixed.

On the other hand, it is also possible that an elastic sealing element is clamped in a groove of the fastening part. As a result, the position of the sealing element is additionally predetermined, since it can not detach itself from the groove automatically. In another embodiment of the invention can be provided that an elastic sealing element engages in a groove-shaped recess of the fastening part and is preferably clamped therein. This may in particular be the same groove in which one or more anchoring parts, for example, screw (s) or rivet (s) engage and are anchored. The sealing element is then excluded or interrupted only at the position of these anchoring parts. Such a recess may, for example, have the shape of a hole and be introduced by means of a simple tool, for example a perforated iron or a knife, preferably manually. When using an anchoring part with an integrally formed tip on the groove bottom facing end face, it is also possible to dispense with such a recess. In that case, instead of this, the rubber material of the gasket can be pierced and / or displaced by screwing in a screw or by piercing or piercing a rivet. In such a case, when replacing the gasket, a new screw or a new blind rivet can be placed anywhere in the groove; it is not necessary to introduce such a screw or blind rivet in the "old" position.

A - for example, flat - fastener can be clamped on an outer side of an elastic sealing element. This it is then responsible to press the actual sealing element frictionally against the fastening part. In this case, the sealing element itself must not be penetrated by the anchoring parts.

Another anchoring option for a fastener is to clamp it in a groove of the fastener. As a result, the desired position of the fastening element can be precisely predetermined and maintained. According to the invention, an elastic sealing element and / or a fastening element may consist of several, mutually separated segments. These need not be connected to each other, but if necessary, they are fixed one behind the other only in a row, in particular by means of the anchoring parts according to the invention. In such segments of a fastener may, for example. To a flat metal part, in particular from a sheet, laser cut strips or punched hole tape strip act.

The anchoring groove according to the invention can run within a plane. It may follow a straight stretch or - as will be explained below - also a curved, in particular circular course. Preferably, the relative movement of the two parts to be sealed takes place within this plane, that is, the respective plane is not left during a movement.

A special case of sealing is when the fastening part and the starting part are rotatable about an axis of rotation against each other. Rotational motions are not subject to any limitation, can therefore last almost infinitely long and therefore make special demands on a reliable seal.

The invention is also suitable for situations where the axis of rotation of the mutually rotatable parts obliquely and / or perpendicular to the groove plane. The anchoring of a sealing element according to the invention defines the same both parallel to its longitudinal or circumferential direction as well as transversely thereto. For this reason, the orientation of the axis of rotation between the mutually rotatable parts is not a restriction for the sealing system according to the invention. The invention recommends a generic sealing device especially when the fastening part and / or the starting part is designed as a rotary part / are. In this case, the sealing element may be formed as a self-contained, two-connected element, which runs along the annular gap. Such an endless sealing element is also reliably anchored with the technique according to the invention.

Another design rule provides that the fastening part and / or the starting part is designed as a ring / are, in particular with an annular course, corresponding to a sealing element with an annular structure.

Finally, it corresponds to the teaching of the invention, which are located in the gap between the starting and fixing part one or more rows of rolling elements. The same is up to keep the width of the gap constant and / or align the ground planes of the two parts to each other, in particular parallel to each other.

Further features, details, advantages and effects on the basis of the invention will become apparent from the following description of a preferred embodiment of the invention and from the drawing. Hereby shows:

1 shows a section through a pivot bearing with a sealing element attached according to the invention.

Fig. 2 shows another embodiment of the invention, also in section;

Fig. 3 is a representation corresponding to Figure 2 of a further modified embodiment of the invention.

FIG. 4 shows a modified embodiment of the invention, also in a representation corresponding to FIG. 2; FIG. such as Fig. 5 shows a further modified embodiment of the invention in a representation similar to Fig. 2. The rotary joint 1 of Fig. 1 comprises an outer ring 2 (in Fig. 1, for example, left) and a concentrically arranged within the same inner ring 3 (in Fig. 1 shown on the right). Both rings 2, 3 each have an approximately rectangular cross-section. The inner circumferential surface 4 of the outer ring 2 has a slightly larger diameter than the outer circumferential surface 5 of the inner ring 3, so that there is an all-around gap 6 therebetween. In the opposite lateral surfaces 4, 5 is ever a running around recess 7, 8 with constant, preferably approximately kreisbogenförmigem cross-section available, in particular incorporated. In it, a number of rolling elements, for example. Rolling balls 9, to allow a relative rotation between the two rings 2, 3. In this case, the axis of rotation about which the rings 2, 3 rotate against each other, relative to the drawing sheet with Fig. 1 moved far to the right and therefore not visible. In order to be able to connect these rings 2, 3 with one connecting construction (machine, plant or vehicle part, chassis or foundation), each ring 2, 3 has a row of fastening bores 10, 11 which are parallel to this axis of rotation and are distributed in a ring around this axis of rotation on. These can be formed as a through hole or as a threaded blind hole. In order to facilitate a screw connection of the two rings 2, 3 with different system parts, the two rings 2, 3 in the axial direction of the axis of rotation are slightly offset from each other, so that, for example. At the top in Fig. 1 end face of the rotary joint 1 of a ring - in the example shown, the inner ring 3 - the other ring - here the outer ring 2 - surmounted and thus at the gap 6 results in a kind gradation, ie an area where the outer circumferential surface 5 of the inner ring 3 against the inner circumferential surface 4 of the outer ring 2 via the gap 6 protrudes upward. Preferably, the gap 6 is filled with a lubricant, in particular lubricating grease. So that this is retained in the gap and protected from penetrating particles, the gap 6 is sealed at one or preferably both end faces. This function takes over in the embodiment of FIG. 1, a flexible sealing element 12 in the form of a self-contained ring of a flexible and elastic material, for example. Of vulcanized, natural or synthetic rubber. The circumference of this sealing element 12 corresponds approximately to the length of the gap 6. The sealing element 2 preferably has a band-like shape with an oblong cross section, as can be seen in Fig. 1, with two Fiachseiten 13, 14 and two same interconnecting narrow sides 15, 16th , which can also be formed as a longitudinal edge (s). In particular, the cross section can taper towards a narrow side 16, so that a sealing lip is formed there. Furthermore, the sealing element 12 is penetrated by a plurality of apertures 17, in particular from one flat side 13 to the other flat side 14.

To fix this sealing element 12 on one of the two rings 2, 3, in the example shown on the inner ring 3, in the over the gap 6 upwardly projecting portion of the outer circumferential surface 5 of the inner ring 3, a circumferential groove 18 is provided, preferably with a rectangular cross-section The width of this groove 8 corresponds approximately to the diameter of the openings 17 in the sealing element 12. The distance of the lower groove edge 19 to the gap 6 is smaller than the distance of the openings 7 of the sealing element 12 to the lower narrow side 16 and sealing lip.

To fix the sealing element 12 to the inner ring 3 are screws 21, in particular machine screws, which are inserted through a respective opening 17 of the sealing element 12 and then are screwed into the groove 18. Preferably, the screws 21 are with a provided screwing thread 22, ie, when screwing the screws 21 into the groove 18, the screw inside the groove 18 itself produces suitable internal thread sections in the local groove flanks 19, which permanently interact with the screw thread 22 and the screws 21 permanently in the groove Hold on to 18. For this purpose, it is advantageous that the core of the screws 21 is equal to or smaller than the groove width or the distance between the two groove flanks 19, while the outer circumference of the threaded portion 22 should be greater than the distance between the two groove flanks 19. In addition the material of the screws 21 should be at least as hard as the material of the respective ring 3, preferably harder than that. For this reason, it has been proven to cure the relevant ring 3 at most in the region of the local career 8 surface, but not durchzuhärten. While as a result of this attachment, a flat side 14 of the sealing element, at least in the vicinity of the openings 17 to the surface of the ring 3, for example, to the protruding portion of a lateral surface, in particular the outer circumferential surface 5 of the inner ring 3, pressed, the screw heads 23 overlap the relevant To prevent these screw heads 23 from slipping through the elastic material of the sealing element 12, a bottom ring 24 can be arranged between the outside flat side 13 of the sealing element 12 and the screw heads 23 embracing it a solid material such as metal; Under certain circumstances, this Unterlegring 24 may consist of several segments that do not need to be connected. This washer 24 preferably has the same circumference as the annular sealing element 12 and, like the latter, also has a band-shaped structure with an oblong cross-section. However, the width of the flat sides 25 of the band-shaped lower ring 24 is slightly narrower than the width of the flat sides 13, 14 of the band-shaped sealing element 12. Also, the lower ring 24 has openings 26, which preferably correspond in their dimensions and in their position with an opening 17 of the sealing element 12 so that they can be penetrated together with those of a screw 21. As a result of this Unterlegrings 24, the contact pressure of the screw heads 23 5 distributed over a large area, namely on the entire flat side 25 of the Unterlegrings 24, whereby damage to the sealing element 12 as well as the slippage of the screws 21 through the openings 17 is safely excluded. The screw heads 23 may be surrounded on their circumference with a conventional hexagon and / or be provided at its free io end face with a slot or Phillips. If screws 21 are used with a very large diameter of the screw head 23, the lower ring 24 may possibly be omitted.

In the arrangement of FIG. 1 is used in the illustrated variant of the inner ring 3 as a fastening part in the context of the invention, during the

Outer ring 2 is used as a stop ring. It would also be possible, of course, to fix a sealing element on the outer ring 2 and to let the sealing lip on the inner ring 3 along when, for example, in the region of the underside of the rotary joint 1 of the outer ring 2 is 20 compared to the inner ring 3 raised. Generally it is for the determination of the

Sealing element in the context of this application is not decisive whether the

Inner ring or an outer ring serves as a fastening part.

Fig. 2 shows a contrast modified embodiment of the seal.

25 The local pivot bearing 1 'differs from the previously described only in the manner of fixing the annular sealing element 12'. However, in contrast to the embodiment described above, this is not due to the lateral surface of the ring facing the gap at the end facing the gap, but rather to the end face 27

30 of the set-back in the axial direction of the ring, in the case of FIG. 2, ie on the end face 27 of the inner ring 2 'shown on the left. There, a circumferential groove 28 is present, in which the screws 21 'as in the previously described embodiment are screwed. The relative dimensions of groove 28 and screws 21 'are the same as in the embodiment of FIG. 1. Also, here again a Unterlegring 24' may be provided, the cross section of which may correspond to the Unterlegrings 24 of FIG. In all cases, the curvature axis about which the sealing ring 1.2, 12 'as well as the lower ring 24, 24' are curved, the axis of rotation of the pivot bearing 1, 1 '. It should be noted, however, that in the lower ring 24 according to FIG. 1, this curvature axis is oriented parallel to the respective ring cross-section, while it is oriented approximately perpendicular to the ring cross-sections in the lower ring 24 'from FIG. While this hardly plays a role in the flexible sealing element 12, 12 ', it should be noted in the more rigid or lower washer 24, 24' that in the case of FIG. 1 it is bent from a straight stretched band and then into a ring 24 can be welded or soldered; the ring 24 ', however, should be punched out of a sheet metal ring.

The arrangement of a pivot bearing 1 "according to FIG. 3 represents a modification of the arrangement of FIG. 2. The annular sealing element 12" is received here in a groove 29, which in the region of the edge between the recessed front side 27 "and the gap. 6 "facing lateral surface 4" of the ring in question - here the outer ring 2 "- is incorporated and in turn may have an approximately rectangular to almost square cross-section. The lower ring 24 "here has a greater width and extends from the groove 28", which is arranged laterally next to the groove 29, to just above this groove 29 and covers them - except for a narrow gap 30 with respect to the lateral surface 5 "of the opposite ring - here of the inner ring 3 "- from.

The annular sealing member 12 "in this embodiment 1" has a cross-section with two legs 31, 32 which enclose an acute angle with each other. A leg 32 carries on its side facing away from the other leg 31 a preferably obtuse angle Sealing lip 33, which runs along a lateral surface 5 "of the non-grooved ring 3". This sealing lip 33 can be pressed against the lateral surface 5 "serving as a contact surface by means of a circumferential tensioning wire 34, which clamps around this leg on the side of the leg 32 opposite the sealing lip 33. The other leg 31, on the other hand, serves primarily to fix the position The axis-parallel length of this leg cross-section corresponds approximately to the axis-parallel height of the groove 29. Also, this leg 31 may be formed solid than the sealing lip 33 supporting leg 32nd

The embodiment 1 ⁽³⁾ according to FIG. 4 can be regarded as a combination of the sealing arrangements according to FIGS. 2 and 3. It comprises two sealing elements 12 ⁽³⁾ , 35, which are arranged one above the other in the axial direction and both on the same ring - in the present example the inner ring 2 ⁽³⁾ - are fixed and both on the other ring - in the present example, the outer ring ⁽³⁾ - walk along. The upper sealing element 12 ⁽³⁾ is identical to the sealing element 12 of FIG. 2; Also, the lower ring 24 ⁽³⁾ and the screws 21 ⁽³⁾ correspond to the arrangement of Fig. 2. As there, the groove 28 ⁽³⁾ in the end face 27 ^{(3) of} the set back in the axial direction ring 2 ^{(3 )} incorporated.

Similar to the embodiment of FIG. 3 is here also a grooved

Region 29 ^{(3) is} present in the region between the set-back end face 27 ⁽³⁾ and the adjacent lateral surface 4 ⁽³⁾ . However, this variant is not a groove with a rectangular

Cross-section, but with a stepped cross section, similar to a staircase with two stages 36, 37, wherein the upper stage 36 the gap 6 ^{(3) is} further than the lower stage 37. The groove 28 ⁽³⁾ is not adjacent to the in this embodiment Groove 29 ⁽³⁾ , but passes through the upper step 36 of the groove 2 ₉ (3). On the lower step 37 of the channel 29 ⁽ FIG. ^{3) there} is a sealing ring 35, which has an elongate, possibly rectangular cross-section. Since this sealing ring 35 is installed with a lying cross-section, the sealing ring 35 may be referred to as a circular disk. The arrangement can be made such that the lateral surface 5 ^{(3) of} the opposing ring 3 ⁽³⁾ serving as the contact surface has a circumferential groove 38 at the level of this sealing ring 35, for example of rectangular cross section. In this groove 38, the region of the sealing ring 35 can engage near its free longitudinal edge or narrow side 39, so that not only a frictional, but virtually even a positive contact results.

This sealing ring 35, the height of which corresponds almost exactly to the height of the lower step 37, is covered by an upper ring 36 placed on the intermediate ring 40 and thereby held in position. The intermediate ring 40 is penetrated by the screws 21 ⁽³⁾ together with the upper sealing element 12 ⁽³⁾ and the lower washer 24 ⁽³⁾ resting thereon, which screw their threads into the groove 28 ⁽³⁾ . The intermediate ring 40 may also consist of several segments that do not need to be connected.

Since the lower sealing ring 35 is positively fixed in the circumferential, groove-shaped recess 38, this seal can also permanently withstand greater pressure differences between the gap 6 ⁽ FIG. ³⁾ and the outer space.

The arrangement according to FIG. 5 represents a modification of the arrangement according to FIG. 2. The arrangement of the stepped rings 2 ⁽⁴⁾ , 3 ^{(4) together} with the intervening gap 6 ^{) , furthermore the sealing element 12 ⁽⁴⁾ and the lower ring 24 ⁽⁴⁾ are completely identical to the arrangement of Fig. 2. The position of the all-round groove 28 ⁽⁴⁾ corresponds to the arrangement of Fig. 2. However, the flanks 41 of the groove 28 ⁽⁴⁾ in this case are not straight but expand towards the groove bottom 20 ⁽⁴⁾ , in particular stepped, so that there is an undercut.

In this groove 28 ⁽⁾ , the sealing element 12 ^{(4) together} with bottom ring 24 ^{() is} not fixed by means of screws, but by blind rivets 42. Each blind rivet 42 consists of a sleeve 43 and a mandrel 44. The mandrel 44 has at its in the groove 28 ⁽⁾ inserted end a thickening 45. This can be pulled after plugging and positioning of the sleeve 43 on the mandrel 44 in the sleeve 43 in and expands the latter thereby, so that it in the undercut portion of the groove 28 ⁽⁴⁾ into it expands and thus positively anchored in the groove 28 ⁽⁴⁾ . The thereby pulled out of the sleeve 43 portion of the mandrel 44 eventually breaks off, and the free end of the sleeve 43 is tapped as usual wide and thereby surrounds the sealing member 12 ⁽⁴⁾ and the lower washer 24 lying on it ⁽⁴⁾ .

Such blind rivets 42 can be used in all the embodiments described above as well as in other applications of the invention instead of the screws 21 described above. Finally, it should be pointed out that the invention can of course be used not only in rotary bearings, but also in other, against each other moving parts, regardless of whether they are rotated against each other or linearly against each other.

*** List of numbers rotary connection 26 opening outer ring 27 front side

Inner ring 28 groove

Inner lateral surface 29 Groove Outer lateral surface 30 Gap

Gap 31 thighs

Deepening G-l Cnci irvci

Recess 33 sealing lip

Ball 34 Tension wire Mounting hole 35 Seal element Mounting hole 36 Step

Seal element 37 step

Flat side 38 groove

Flat side 39 longitudinal edge narrow side 40 intermediate ring narrow side 41 flank

Opening 42 Blind rivet

Groove 43 sleeve

Flank 44 thorn

Groove bottom 45 thickening screw

screw thread

screw head

washer

flat side

Claims

claims

Device for sealing a gap (6) between at least two mutually moving parts (2, 3), namely a fastening part (2, 3), to which at least one elastic sealing element (12, 35) is fixed in the region of one of its longitudinal edges (15), and a starting part (3; 2) on which another edge (16, 39) of at least one elastic sealing element (12, 35) runs, characterized in that the fastening part (2; 3) has at least one along the gap (6) Groove (18; 28), wherein one or preferably a plurality of anchoring parts (21; 42) engage, which engage through (s) the sealing element (12) and / or at least one retaining element (24) holding same.

Device according to claim 1, characterized in that the extent of a section of an anchoring part (21; 42) engaging in the groove (18; 28) in the longitudinal direction of the groove (18; 28) is equal to or smaller than twice the maximum width of the groove (18; 18, 28), preferably equal to or less than one and a half times the maximum width of the groove (18, 28).

Device according to claim 1 or 2, characterized in that the extension of the core of a section of an anchoring part (21; 42) engaging in the groove (18; 28) in the longitudinal direction of the groove (18; 28) corresponds approximately to the groove width.

Device according to one of claims 1 to 3, characterized in that an anchoring part is designed as a screw (21), preferably as a machine screw, in particular as a machine screw with a self-tapping thread (22).

5. Device according to one of the preceding claims, characterized in that an anchoring part is formed as a rivet, in particular as a blind rivet (42), the inner, widened end in an undercut, ie, widened relative to the groove opening portion of the groove (18; ) is located.

6. Device according to one of the preceding claims, characterized in that an anchoring part (42) comprises a sleeve (43) which is pushed or pushed onto a core or dome (44).

7. The device according to claim 6, characterized in that the core or mandrel (44) in the region of the groove bottom an enlargement or thickening (45) to expand a deferred sleeve (43) in the region of the groove bottom.

8. Device according to one of the preceding claims, characterized in that a portion of an anchoring part (21; 42) for engagement in the groove (18; 28) has a rotationally symmetrical cross section, optionally with the exception of a thread arranged thereon (22).

9. Device according to one of the preceding claims, characterized in that a portion of an anchoring part for engaging in the groove (18,28) has an elongated cross-section which allows for insertion upon rotation in the longitudinal direction of the groove (18; 28) and upon rotation transverse to the longitudinal direction of the groove (18; 28) the anchoring to an undercut of the groove (18; 28).

10. Device according to one of the preceding claims, characterized in that an elastic sealing element (12,35) on a surface (4; 5; 27) of the fastening part (2; 3) is clamped.

11. Device according to one of the preceding claims, characterized in that an elastic sealing element (12,35) in a groove (29; 36,37) of the fastening part (2; 3) is clamped.

12. Device according to one of the preceding claims, characterized in that an elastic sealing element (12,35) in a groove-shaped recess (18; 28) of the fastening part (2; 3) engages and is preferably clamped therein.

13. Device according to one of the preceding claims, characterized in that a fastening element (24) on an outer side (3) of an elastic sealing element (12) is clamped.

14. Device according to one of the preceding claims, characterized in that a fastening element (40) in a groove (29) of the fastening part (2, 3) is clamped.

15. Device according to one of the preceding claims, characterized in that an elastic sealing element (12,35) and / or a fastening element (24; 40) consists of a plurality of mutually separated segments.

16. Device according to one of the preceding claims, characterized in that the groove (18; 28) extends within a plane.

17. Device according to one of the preceding claims, characterized in that the fastening part (2, 3) and the starting part (3, 2) about an axis of rotation against each other are rotatable.

18. Device according to claim 16 in conjunction with claim 17, characterized in that the axis of rotation is perpendicular and / or oblique to the plane of the groove (18, 28).

19. Device according to one of the preceding claims, characterized in that the fastening part (2; 3) and / or the starting part (3; 2) is designed as a rotary part / are.

20. Device according to one of the preceding claims, characterized in that the fastening part (2; 3) and / or the starting part (3; 2) is designed as a ring / are.

21. Device according to one of the preceding claims, characterized in that in the gap (6) between start-up and fastening part (2,3) one or more rows of rolling elements (9) are located.