DE10309383A1 - Two-part all-weather seal for wind turbine blade root and bearing - Google Patents

Abstract

A wind turbine has three variable-pitch blades mounted on a hub at the top of a mast. Each propeller blade has roller bearings. The interface between the blade root and bearing within the hub is surrounded by a first protective shell ring of non-corroding material. The interface between the shell and the adjoining components is protected by an overlapping elastic shell seal.

Description

The invention is directed to a pivot bearing for exposure to moisture Plants, for example for the sheet storage of a wind energy plant, for ship's winches or the like, with two mutually rotatable connection elements, with at least one between the same arranged, single or multi-row rolling bearings in particular for Absorption of axial and / or radial loads and / or tilting moments, as well as with at least one seal to protect the rolling bearing (s) from moisture and Corrosion, it is irrelevant whether it is pure axial or radial roller bearings is a combination warehouse.

Man has always sailed the sea by ship; since using Iron for ship's hull and superstructure was the aggressive sea air because of her corrosive properties permanent cause of rust formation on all iron parts, For example on windlasses, etc. However, all defects caused by this can mostly in the next port with comparatively moderate effort. The same applies, for example, to drilling rigs, where repairs are carried out with the existing one Tool can be carried out on site.

On the other hand, there has recently been a realization that use alternative energy sources is becoming increasingly economical. In addition to hydropower plants wind turbines in particular have already proven their economic viability posed. Due to problems with the purchase of land, with negative Residents and especially with irregular blowing wind in the inland the transition to the region beyond the coast is reinforced by construction to use so-called off-shore wind turbines. Cheap plots, no residents, steady, strong wind are the advantages - the aggressive sea air and the difficult Maintenance is an added disadvantage. If you don't have this disadvantage at first attached too great importance, so now shows after several years of operation many wind turbines in the coastal area that the rust development stronger is feared, and most importantly, that the long-term effects for a Wind turbines can be catastrophic. The leaf bearings are particularly affected, which serve to make the blades of the wind turbine less or stronger depending on the wind strength to hire. These rotary bearings usually have a diameter of 1 to 3 meters or more and, due to this size, cannot economically be made of stainless steel Material. Instead, corrosion protection is used Galvanizing layer on the one hand and one or more seals on the other. This However, the galvanizing layer is rubbed through by the relevant sealing ring, it Rust scars form, which wear the seal, causing moisture in the Reaches the inside of the bearing, causing corrosion and thus blocking the bearing leads. For the then necessary replacement of the relevant blade bearing, a Floating crane to be driven to the wind turbine in question, the sheet lift off and reassemble after replacing the blade bearing. The cost of this is enormous and burden the profitability of the wind turbine in question quite considerably.

This results from the disadvantages of the prior art described Problem initiating invention to find a way such as the formation of rust at least in the area of the treads or rolling elements of an aggressive one Environmental conditions, for example at sea, but also at coastal and inland locations exposed pivot bearings can be avoided in the long term.

The solution to this problem is achieved by using a seal a first connection element concentric with its axis of symmetry surrounding ring-shaped element made of a non-corrosive material (Corrosion-free ring) is fixed, and at least on the second connection element a ring-shaped, elastic sealing element is also attached (elastic ring), wherein at least one sealing lip of the elastic ring on the corrosion-free ring is applied (main sealing lip).

The invention dispenses with a direct one in the context of the main seal Contact between a sealing ring fixed to a connection element on the one hand and the galvanizing layer of the other, in contrast, rotating Connection element on the other hand. This also means that due to the investment pressure Seal inevitably occurring abrasion of the galvanizing layer avoided consequently the exposure of the bare metal in the area of the main seal, which the Formation of rust under the main seal and thus the penetration of moisture would result. Rather, a ring is made of a corrosion-free material used, which does not require galvanizing or other rust protection and still never subject to corrosion. The main seal therefore remains intact in the long term and can therefore the sensitive parts of the pivot bearing in question before Protect moisture ingress.

The invention makes it possible for the mutually rotatable connection elements to use a non-corrosion-free - and therefore cheaper - material without that due to such a necessary rust protection coating, e.g. a Zinc coating that would limit the sealing effect.

The corrosion-free ring should consist of a dimensionally stable or rigid material, so that on the one hand it can shape itself independently of the speed and possibly resulting centrifugal forces and also keeps the elastic ring can lead or support.

The elastic sealing ring must be some with the large dimensions mentioned above Rotary bearings have a comparatively hard consistency in order to be reliable To be held in place and to keep its shape. Therefore, that of this caused abrasion effect on the corrosion-free ring be ignored; to prevent premature wear of the The invention therefore provides a corrosion-free ring for this material a high hardness that should be higher than the hardness of the used Seal. The use has proven particularly useful in this context a metal ring, especially made of brass.

In order to exclude periodic deformations of the elastic ring, which ones could lead to accelerated wear of the same, is also an over Ring circumference completely constant cross-section important. This cross section itself again you can choose almost anything; at least the contact area should however, be designed as a flat or only moderately curved surface, so that the elastic Sealing ring has no problems to achieve a complete seal. proven therefore has, for example, an approximately polygonal, in particular rectangular, cross section of the corrosion-free ring.

Because the corrosion-free ring is made of a high quality and therefore possibly expensive material to manufacture, there is a desire to cross-section to be chosen comparatively small and thus to save material. To still be one To obtain maximum strength, the invention recommends the edge course of the Ring cross-section only follows straight or convexly curved curve sections to let. As a result, there is neither a reduction in cross section nor a radial view Notches causing kinks or other bends.

It is also important that the ring is completely closed. Because on the one hand, this ensures that the main seal does not leak Has positions, and on the other hand there is no tendency to join expand higher speeds due to the associated centrifugal forces.

After all, the ring should not consist of several lamellae, spirally wound Layers or the like. Be built up because the contact surfaces or the like Capillary action could attract moisture.

Furthermore, the invention provides that the corrosion-free ring neither in the gap still protrudes between the mutually rotatable connection elements overlaps. As a result, the assembly of the invention Rotary bearing facilitated, on the other hand, this gap can then be used to fix the elastic ring can be used, as will be explained below.

It has proven to be advantageous that the corrosion-free ring in a region of the relevant connection element is arranged, the opposite of the corresponding Front of the other connection element is set back in the axial direction. This makes it possible to attach the sealing ring that comes into contact with one To define the jacket area of the axially projecting connection element and such to train that it encompasses the corrosion-free ring in the shortest possible way.

To fix it, the corrosion-free ring can be located in an axis of symmetry relevant connecting element circumferential groove or groove. This enables a mechanically very stable form fit to be formed; also can thus any gap between the corrosion-free ring and the relevant one Connection element can be avoided, so that the sealing effect impairing bypass effect for penetrating moisture completely is excluded. Alternatively or cumulatively to the reception of the ring in a groove it can also be attached using rivets or screws. Also a Caulking (making a joint fit, inserting the ring into the relevant one Groove and deformation of the groove edges), gluing or soldering is conceivable.

In a first embodiment, the corrosion-free ring is in the groove or Groove pressed or caulked. For this purpose, the cross sections the interlocking parts of the ring and groove in the manner of an interference fit be measured. A joint fit is sufficient for caulking because the fixation then brought about by deformation of the groove or fillet edges becomes. On the other hand, this connection technology is the simplest option and leads to a complete centering of the ring on the connection element. Since the corrosion-free ring during the operation of external forces especially in Axial direction of the pivot bearing is almost free, you get a stable in this way and permanent connection.

Another method for fixing the corrosion-free ring in the groove or Grooving involves gluing these parts together. Such a connection leaves produce without the use of a press; In addition, an adhesive, for example resin based with electrical insulating properties can be used to a corrosion-free metal ring opposite the groove and thus also opposite to electrically isolate the body of the relevant connection element, so that none electrochemical elements can arise.

On the other hand, it is also possible to pour the corrosion-free ring into the groove, so that there is a particularly intimate connection of the ring with the connecting element results.

If the corrosion-free ring is completely sunk into a groove or groove and with their edges is approximately flush, the elastic sealing ring on one not encompassed side of the corrosion-free element.

The stabilization of the corrosion-free ring is further promoted by the fact that the elastic sealing ring rests on the corrosion-free ring in such a way that the resulting, pressing force acting on the corrosion-free ring to the bottom of the groove or Grooving is directed if it cannot be neglected. Since the corrosion-free ring preferably in an axial groove or notch in one end face a connector is used, it is mainly fixed by friction. A - even if only moderate - contact pressure therefore ensures that it remains in place provided annular recess.

In one possible embodiment, the part of the corrosion-free ring exclusively its fixation, while another part of the Corrosion-free ring extends beyond the end face of the connecting element in question to provide the actual sealing contact area there. Although the corrosion-free ring also arranged on a lateral surface of a connecting element could be, but is the insertion of a closed ring in an end Groove of the connecting element significantly easier and therefore i. a. preferable.

If the height of the raised area of the corrosion-free ring is smaller or is at most equal to the depth of the groove receiving this, so there is a balanced ratio between the size and the volume of the ring on the one hand the positive or non-positive connection serving to stabilize it.

A particularly good sealing effect is obtained when the elastic sealing ring is attached to two opposite sides of the raised area of the corrosion free Rings around. This allows the corrosion-free ring with its two, each other opposite sides a centering effect of the elastic sealing ring take over and thus contributes to a stable fit of the elastic sealing ring and thus to a permanent, optimal sealing effect.

In a modified embodiment of the invention, the corrosion-free closes Ring flush with the face or shell side of the connection element in question or is deepened in it. In this case, the remaining top or Outside of the corrosion-free ring as a contact surface for the elastic ring. Care should be taken to ensure that the corrosion-free ring is flush is that the elastic ring or a sealing lip of the same precisely on the Corrosion-free ring rests because, for example, an eccentric shift to one rapid wear of the elastic ring and thus leakage of the main Could lead seal forms a ring recessed in the relevant connector additionally a guide track for the elastic ring.

According to yet another embodiment, when the corrosion-free ring in a groove of the connecting element concerned two Adjacent areas of the corrosion-free ring, each with one of two The outer surfaces of this connection element are aligned, which are in the area of the groove lie. The resulting smooth surface transition makes unnecessary Avoid edges that cause injuries to the elastic sealing ring could, and therefore allow a further development of the invention, the elastic Sealing ring on one or both of these jacket sides of the corrosion-free ring fits tightly.

By the contact area (s) of the elastic ring with the corrosion-free ring (each) is (are) designed as a sealing lip, can be made use of Material properties of the elastic sealing ring and the sealing contact Realize supportive, elastic contact pressure in such a way that the sealing lips due to a bias of the elastic sealing ring with its end areas on the corrosion-free ring are pressed.

The invention can be further developed in that on the elastic ring - from seen from the corrosion-free ring - beyond one (the two) main Sealing lip (s) (in each case) at least one further, annular sealing lip is provided, which rests on the first connection element (secondary sealing lip). Such secondary Sealing lips keep external influences such as dust or abrasion particles from the bearing away from the main sealing lip (s), thereby ensuring that the main Seal remains functional in the long term even without regular inspection.

The secondary sealing lip facing away from the rolling bearing area to be sealed can elastic on the galvanized or provided with another rust protection coating Area of the connection element in question are pressed. Even if that Sealing effect of the secondary sealing lip over time due to abrasion subsides, this has no negative impact on the main seal.

The secondary part facing the rolling bearing area to be sealed preferably projects Sealing lip into the air gap between the two connection elements. There it takes on a function similar to that of the outer secondary sealing lip opposite Abrasion particles from the pivot bearing itself, but at the same time it is in front of external ones Influences protected.

The secondary sealing lip protruding into the air gap can be barb-shaped Have cross-section and by elastic spreading to each other lie opposite surfaces of the two connection elements in a sealing manner. This secondary sealing lip therefore automatically generates the required contact pressure. On the other hand, it also takes over due to the barb cross-section a valve function for the grease by putting pressure in the pivot bearing injected grease can pass through this secondary sealing lip, but then is retained and can therefore lubricate the main sealing lips.

It is within the scope of the invention that at the part of the elastic sealing ring, especially beyond that protruding into the air gap Secondary sealing lip, one running along this sealing ring in the circumferential direction Extension is formed with a bead or spring-like cross section, which for Attachment of the elastic sealing ring in a groove-shaped recess in the relevant Connection element can be inserted. During the corrosion-free ring a guide of the elastic sealing ring in the area of the relevant connection element and accomplished preferably in the axial direction of the pivot bearing, it is the responsibility of (Front) extension of the elastic sealing ring, this also in the area of the other Stabilize connecting element.

In order by elastic spreading forces of the extension with bead or spring-like Cross section within the groove receiving this high anchoring force cause, this can be provided with profiles, for example have sawtooth-shaped cross section, the elevations of these profiles are pressed together by the narrower groove cross section.

According to a further feature of the invention, the depth of the groove-shaped recess for receiving the extension of the elastic sealing ring approximately perpendicular to the air gap between the two connection elements, so that the elastic sealing ring due to its engaging extension in this groove Stabilization and anchoring experienced in the radial direction and therefore, for example an internal overpressure caused by pressing in grease can expand or loosen from its anchoring.

A relocation of the groove-shaped recess for the lateral extension of the elastic Sealing ring in an area outside the air gap makes it easier to insert the ring Extension into the designated groove.

To protect against corrosion, one or both connection elements outside the sealed area galvanized or provided with another rust protection layer his. The main seal remains due to the ring made of corrosion-free material intact, even if part of the external influences, friction, etc. Rust protection layer would be removed and consequently corrosion. The main Sealing forms a barrier that cannot be overcome by corrosion.

If the groove-shaped recess (es) for receiving the corrosion-free ring and / or an extension of the elastic sealing ring from an anti-rust treatment of the connecting element in question, in particular galvanizing, is not affected (are), the roughness of the groove boundary walls can be reduced to a minimum become, which facilitates the attachment of the corrosion-free ring.

Finally, it is the teaching of the invention that the entire range between The main and / or secondary sealing lips are filled with grease. That grease On the one hand, it is the responsibility of the main sealing lips to slide with as little friction as possible to ensure the corrosion-free ring. In addition, it serves the additional Protection of the main sealing lips from dust, abrasion or rust particles by the same be embedded in the grease and therefore not up to the main sealing lips can reach.

Other features, details, advantages and effects based on the invention result from the following description of preferred embodiments of the Invention and with reference to the drawing. Here shows:

Fig. 1 shows the hub region of the trifoliate rotor of a wind energy plant;

FIG. 2 shows a rotary bearing which can be used as a blade bearing in the context of the wind energy installation from FIG. 1;

Fig. 3 is a section through the pivot bearing of Figure 2 taken along the line II-II.

FIG. 4 shows detail IV from FIG. 3 on an enlarged scale;

FIG. 5 shows another embodiment of the invention in a representation corresponding to a detail from FIG. 4;

FIG. 6 shows a further modified embodiment of the invention in a representation corresponding to FIG. 4; and FIG. 7 shows a further modified embodiment of the invention in a representation corresponding to FIG. 4.

In Fig. 1 the upper region of the tower 1 of a wind turbine 2 can be seen. The machine house 3 , which can be pivoted about a vertical axis, carries a hub 4 which can be rotated about a horizontal axis and to which three rotor blades 5 which extend in the radial direction are attached in order to collect wind energy. In order to be able to adapt the wind pressure to be picked up by the rotor blades 5 to the respective wind speed, these can be rotated relative to the hub 4 about axes parallel to their longitudinal axis. This possibility of movement is accomplished in each case by a rotary bearing 6 , as is shown in FIG. 2 on its own.

One can see two ring-shaped connecting elements 7 , 8 which can be rotated relative to one another and are fixed on the hub 4 on the one hand and on the rear end face of the rotor blade 5 in question on the other hand. For this purpose, the two connection elements 7 , 8 , which are arranged concentrically to one another, are each provided with a multiplicity of rings arranged between the two end faces 9 , 10 ; 11 , 12 through mounting holes 13 , 14 provided.

From Fig. 3 it can also be seen that the connection elements 7 , 8 each have an approximately rectangular cross section with approximately the same height. The connecting elements 7 , 8 are largely arranged one inside the other, but the inner diameter of the outer connecting element 7 is larger than the outer diameter of the inner connecting element 8 , so that there is an air gap 15 of approximately constant width therebetween. In the two facing surface areas 16 , 17 of the two connection elements 7 , 8 , a circumferential groove 18 , 19 with the cross section of a circular segment is incorporated, so that a toroidal raceway for spherical rolling elements 20 results overall. In the context of other embodiments, however, rolling elements with a different shape can also be used, for example cylindrical or needle-shaped rolling elements. Several rows of rolling elements can also be provided.

The connecting elements 7 , 8 preferably consist of a heat-treatable steel suitable for such applications, but which is not corrosion-free. Therefore, outside of the air gap 15, they are covered with a zinc layer 21 that protects against corrosion.

Since the two connection elements 7 , 8 are offset from one another in the axial direction of the rotary bearing 6 , in the region of the front ends of the air gap 15 there is in each case one end face 10 , 11 of a connection element 7 , 8 opposite the relevant end face 12 , 9 of the other connection element 8 , 7 about. A seal 22 , 23 is provided in each of these areas. In the illustrated embodiment of a rotary bearing 6 , the construction of both seals 22 , 23 is identical, but this is not mandatory.

A seal 22 , 23 comprises two components, namely a ring 24 made of a corrosion-free material on the one hand and a ring 25 made of a (limited) elastic material on the other hand.

The corrosion-free ring 24 can, for example, consist of brass or some other rustproof metal or metal alloy. But it can also be made of a plastic, provided that it has a sufficiently abrasion-resistant surface texture. Possibly. The surface of the ring 24 can also be hardened or provided with a wear-resistant coating.

In the embodiment shown, the corrosion-free ring 24 has a rectangular cross section, its width in the axial direction of the rotary bearing 6 being approximately 1.5 to 5 times, in particular approximately 3 times as large as its thickness in the radial direction of the rotary bearing 6 . Other cross-sectional shapes are possible.

This ring 24 is accommodated in approximately half of its cross section in a groove 26 which is arranged concentrically to the axis of rotation of the rotary bearing 6 in the end face 9 of a connecting element 7 set back from the other connecting element 8 . The cross section of this groove 26 corresponds in terms of its width to the radial thickness of the ring 24 , while the groove depth corresponds to approximately half the ring width. In the embodiment according to FIG. 4, the corrosion-free ring 24 is fixed in the groove 26 by caulking.

On the other hand, as FIG. 5 shows, it is also possible to glue the corrosion-free ring 24 into the groove 26, for example. If an electrically non-conductive adhesive 27 , for example made of epoxy resin or the like, is used for this purpose, then electrical insulation between the corrosion-free ring 24 and the relevant connection element 7 can be produced at the same time, which results in the formation of an electrochemical element by the meeting of two different metals prevented.

From Fig. 4 It is also apparent that the Nutvertiefungen 26 and the rings is used in each of the two seals 22, 23, the surface of the respective connecting element 7 in an outer, galvanized area 21 on the one hand and the air gap 15 is divided 24 on the other hand, the outwardly is sealed and therefore does not have to be galvanized.

The elastic sealing ring 26 forms the counterpart to the corrosion-free ring 24 and is therefore largely non-rotatably fixed on the other connecting element 8 . For this purpose, a circumferential groove 29 is incorporated in the section 28 of the lateral surface 17 of the other connection element 8 projecting over the end face 9 of the connection element 7 with the corrosion-free ring 24 , into which an end extension 30 of the elastic sealing ring 25 engages. This extension 30 has a cross section with sawtooth-shaped elevations, which press together when pressed into the groove 29 and thereby ensure a firm frictional engagement in the groove 29 .

Since no undercuts are thus provided within the air gap 15 , the seal 22 , 23 can be replaced without dismantling the connection elements 7 , 8 . This is particularly important in the event of damage or in the event of long-term degeneration, for example due to the action of ozone or solar radiation or due to material fatigue that cannot be ruled out.

This extension 30 is located on an end face 31 of the elastic ring 25 , which abuts the outer surface 17 of the connection element 8 in question. From here, the outer cross-sectional edge of the elastic ring 25 extends over the air gap 15 and the corrosion-free ring 24 in a wide arc 32 to the galvanized end face 9 of the other connection element 7 . A secondary sealing lip 33 is provided there, which bears against the connecting element 7 along a narrow area.

The inner or lower region 34 of the sealing ring 25 roughly follows its outer, curved course 32 , so that the corrosion-free ring 24 is also overlapped thereby. On both sides of this ring 24 , a sealing lip 35 , 36 (main sealing lips) extends downward from the lower region 34 of the elastic sealing ring 25 . These two sealing lips 35 , 36 are spaced apart in their upper region which is greater than the (radial) thickness of the corrosion-free ring 24 , but approach each other in their lower region and are therefore deformed radially on the outside and inside, respectively lying side 37 , 38 of the ring 24 pressed. In addition to the actual sealing, this has the further effect that the elastic ring 25 is guided in the radial direction.

Because the outer secondary sealing lip 33 is supported on the connection element 7 , it carries the elastic sealing ring 25 together with the extension 30 and thereby keeps the main sealing lips at a distance above the end face 9 of the connection element 7 concerned . The main sealing lips 35 , 36 therefore slide only on the corrosion-free ring 24 , and an optimal wear resistance can be ensured by a suitable material pairing.

Finally, a further secondary sealing lip 39 is formed on the underside 34 of the elastic sealing ring 25, approximately in the extension of its end face 31 , which protrudes into the air gap 15 . This secondary sealing lip 39 is given a barb-like cross section by an extension 41 attached to its inner end 40 and extending obliquely outwards. As a result, the secondary sealing lip 39 is elastically deformed when it is introduced into the air gap 15 and generates an expansion force which ensures a high contact pressure with respect to both lateral surfaces 16 , 17 of the connecting elements 7 , 8 . This protects the main seal 35 , 36 from abrasion particles from the rolling bearing area 15-20 .

On the other hand, the extension 41 can be pressed aside when the grease pressed into the rotary bearing 6 is overpressured, so that the grease can reach the area of the main seal 35 , 36 , where it is then held in place after the extension 41 springs back. It is thereby achieved that all cavities within the seal 22 , 23 up to its outermost secondary sealing lip 33 are always completely filled with grease and remain. In addition, reaching around the edge 42 (cf. FIG. 4) through the outer secondary sealing lip 33 on the one hand and the extension 41 of the inner secondary sealing lip 39 on the other hand leads to particularly high dimensional stability (good stability) and thus to long-term security of the sealing effect.

The same applies to the seal 43 from FIG. 6. This differs from the seal 22 from FIG. 4 above all in that the corrosion-free ring 44 is not inserted here in a groove 26 of a connecting element 7 , but in a groove 45 with approximately rectangular or even square cross-section, which is located in the region of the edge between the end face 9 of the connecting element 7 in question and its outer surface 16 on the air gap side. The cross section of the corrosion-free ring 44 is approximately adapted to the fillet cross section, so that its jacket sides 46 , 47 are flush with the surfaces 9 , 16 of the connecting element 7 in question . The corrosion-free ring 44 can be fixed, for example, with adhesive as in the embodiment according to FIG. 5.

In accordance with the changed geometry of the corrosion-free ring 44 and its jacket sides 46 , 47 , which are not encompassed by the connecting element 7 , the elastic ring 48 is also modified compared to the elastic ring 25 : the main sealing lips 49 , 50 become elastic against one of the two jacket sides 46 , 47 of the corrosion-free ring 44 pressed. The projecting, free edge 51 of the corrosion-free ring 44 has a stabilizing and anchoring effect similar to that of the raised area of the corrosion-free ring 24 from FIG. 4.

Yet another seal 52 is shown in FIG. 7. This forms a combination of design features from the above-described embodiments, insofar as a corrosion-free ring 53 with an approximately square cross section is used here, but is inserted into a circumferential groove 54 in the end face 9 of a connecting element 7 , in contrast to the embodiment However, in such a way that its upper surface 55 flush according to Fig. 4 with the end face 9.

As with all other designs, the elastic ring 56 is also fixed to the respective other connecting element 8 , specifically with an extension 30 of barb-shaped cross section inserted into a groove 29 running around the jacket side 17 . This ring 56 has only one main sealing lip 57, which bears against the upper side 55 of the corrosion-free ring 53 . Their geometry corresponds approximately to the outer main sealing lip 49 according to FIG. 6, but may additionally have a slight kink 58 , preferably in the direction of the corrosion-free ring 53 , in order to optimize the contact pressure. An outer secondary sealing lip 59 roughly corresponds in cross section to the geometry of the relevant elements 33 of the previously described sealing embodiments 22 , 43 .

In contrast, in this seal 52 , the area 60 of the elastic sealing ring 56 protruding into the gap 15 is fundamentally different. Starting from the extension 30 accommodated in the groove 29 , this extends initially approximately parallel to the relevant shell side 17 along this and into the gap 15 . There it detaches from this jacket side 17 and forks into a main arm 61 and a secondary arm 62 .

The stronger main arm 61 crosses the gap 15 at an angle which is strongly inclined to the central plane of the rotary bearing, for example by approximately 30 ° relative to the planes of the lateral surfaces 16 , 17 until it bears on the opposite lateral side 16 . By being supported on this lateral surface 16 , the main arm 61 supplies a radial force which presses the extension 30 firmly into the groove 29 in the opposite lateral surface 17 and thus counteracts a loosening of the elastic ring 56 . This also ensures that the main sealing lip 57 is located radially exactly above the corrosion-free ring 53 , since the latter does not experience any centering force on the latter.

In order to tolerate smaller deformations or displacements of the elastic ring 56 , the free upper side 55 of the corrosion-free ring 53 is wider than in the embodiment according to FIG. 4, for example approximately as wide as the depth of the groove 54 , for example just as wide as the gap 15 or wider than that.

The second, cross-sectionally smaller arm 62 of the elastic ring 56 bulges back to the jacket side 17 in the connecting part 8 with the fastening groove 29 for the extension 30 of the elastic ring 56 and is supported there. As a result of this support, the main arm 61 , the cross-sectional shape of which is originally slightly arched with a curvature in the direction of the connecting element 8 carrying the fastening groove 29 , is elastically straightened somewhat against this curvature. As a result, the contact force of the main arm 61 against the lateral surface 16 is increased.

If the top 55 of the corrosion-free ring 53 is recessed into the end face 9 of the connecting element 7 in question, for example by the height of the corrosion-free ring 53 only corresponding to approximately half the groove depth, the main sealing lip 57 can additionally be located on the lateral edges of the groove 54 support, in particular on the radially outer edge, and thus generate a strong radial force, for example, to press the fixing extension 30 into the groove 29 provided therefor.

Claims (34)

1. rotary bearing ( 6 ) for systems exposed to moisture, for example for the blade mounting of a wind turbine ( 2 ), for ship's winches or the like, with two connecting elements ( 7 , 8 ) which can be rotated relative to one another, with at least one arranged between them, one or multi-row roller bearings ( 18-20 ) in particular for absorbing axial and / or radial loads and / or tilting moments, and with at least one seal ( 22 , 23 ; 43 ; 52 ) for protecting the roller bearing (s) ( 18-20 ) against moisture and corrosion, characterized in that a) in the context of a seal ( 22 , 23 ; 43 ; 52 ) on a first connection element ( 7 ) whose symmetry axis concentrically surrounding annular element ( 24 ; 44 ; 53 ) is fixed from a non-corrosive material (corrosion-free ring), and b) at least one likewise ring-shaped, elastic sealing element ( 25 ; 48 ; 56 ) is fastened to the second connection element ( 8 ) (elastic ring), a sealing lip of the elastic ring being in contact with the corrosion-free ring (main sealing lip). 2. pivot bearing according to claim 1, characterized in that the mutually rotatable connecting elements ( 7 , 8 ) consist of a non-corrosion-free material. 3. pivot bearing according to claim 1 or 2, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) consists of a dimensionally stable material. 4. pivot bearing according to one of the preceding claims, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) has a higher hardness than the elastic sealing ring ( 25 ; 48 ; 56 ). 5. Pivot bearing according to one of the preceding claims, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) consists of a metallic material, in particular a metal alloy, for example made of brass. 6. pivot bearing according to one of the preceding claims, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) has an approximately polygonal, in particular rectangular cross-section. 7. pivot bearing according to one of the preceding claims, characterized in that the cross section of the corrosion-free ring ( 24 ; 44 ; 53 ) is bordered only by straight or convex sections. 8. pivot bearing according to one of the preceding claims, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) neither projects into the gap ( 15 ) between the mutually rotatable connecting elements ( 7 , 8 ) nor engages over them. 9. pivot bearing according to one of the preceding claims, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) is arranged in an area ( 9 ) of the relevant connecting element ( 7 ), which is opposite the corresponding end face ( 11 ) of the other connecting element ( 8 ) is set back in the axial direction. 10. Rotary bearing according to one of the preceding claims, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) is inserted in a groove ( 26 ) or groove ( 45 ) encircling the axis of symmetry of the connecting element ( 7 ) in question. 11. A pivot bearing according to claim 10, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) is pressed or caulked into the groove ( 26 ; 54 ) or groove ( 45 ). 12. pivot bearing according to claim 10 or 11, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) in the groove ( 26 ; 54 ) or groove ( 45 ) is glued ( 27 ). 13. Pivot bearing according to claim 10, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) is cast into the groove ( 26 ; 54 ) or groove ( 45 ). 14. Rotary bearing according to one of claims 10 to 13, characterized in that the elastic sealing ring ( 25 ; 48 ; 56 ) on at least one side ( 37 , 38 ; 46 , 47 ; 55 ) which is not (completely) encompassed by the connecting element ( 7 ) ) of the corrosion-free ring ( 24 ; 44 ; 53 ). 15. pivot bearing according to one of claims 10 to 14, characterized in that the elastic sealing ring ( 25 ; 48 ; 56 ) rests on the corrosion-free ring ( 24 ; 44 ; 53 ) such that the resulting, on the corrosion-free ring ( 24 ; 44 ; 53 ) acting contact force is directed to the bottom of the groove ( 26 ) or groove ( 45 ) if it cannot be neglected. 16. Pivot bearing according to one of claims 10 to 15, characterized in that the corrosion-free ring ( 24 ; 44 ; 53 ) at least partially protrudes beyond the relevant face or casing side ( 9 , 16 ) of the relevant connecting element ( 7 ). 17. Pivot bearing according to claim 16, characterized in that the height of the raised area of the corrosion-free ring ( 24 ) is less than or at most equal to the depth of the groove ( 26 ) receiving it. 18. Pivot bearing according to claim 16 or 17, characterized in that the elastic sealing ring ( 25 ) bears on one or preferably both of the opposite side flanks ( 37 , 38 ) of the raised area of the corrosion-free ring ( 24 ). 19. Rotary bearing according to one of claims 10 to 15, characterized in that the corrosion-free ring ( 53 ) with the end or shell side ( 9 ) of the connecting element ( 7 ) in question is flush or recessed therein. 20. Pivot bearing according to one of claims 10 to 15, characterized in that two adjacent casing regions ( 46 , 47 ) of the corrosion-free ring ( 44 ) each approximately flush with one of two surfaces ( 9 , 16 ), which in the region of the ring ( 44 ) receiving groove ( 45 ). 21. Rotary bearing according to claim 20, characterized in that the elastic sealing ring ( 48 ) bears on one or two adjacent jacket regions ( 46 , 47 ) of the corrosion-free ring ( 44 ). 22. Rotary bearing according to one of the preceding claims, characterized in that the contact area (s) of the elastic ring ( 25 ; 48 ; 56 ) with the corrosion-free ring ( 24 ; 44 ; 53 ) (in each case) as a sealing lip ( 35 , 36 ; 49 , 50 ; 57 ) are formed. 23. Rotary bearing according to claim 22, characterized in that the sealing lip (s) ( 35 , 36 ; 49 , 50 ; 57 ) due to a pretensioning of the elastic sealing ring ( 25 ; 48 ; 56 ) with its end region (s) is (are) pressed against the corrosion-free ring ( 24 ; 44 ; 53 ). 24. Rotary bearing according to one of the preceding claims, characterized in that on the elastic sealing ring ( 25 ; 48 ; 56 ) at least one further, annular sealing lip ( 33 , 39 ; 56 , 61 , 62 ) beyond the main sealing lip ( 35 , 36 ; 49 , 50 ; 57 ; seen from the corrosion-free ring) and / or beyond the corrosion-free ring ( 24 ; 44 ; 53 ; seen from the fastening-side connection element 7 ), which bears against the first connection element ( 8 ) ( In addition to sealing lip). 25. Rotary bearing according to claim 24, characterized in that an auxiliary sealing lip ( 33 ; 56 ) facing away from the rolling bearing area ( 15-20 ) to be sealed resiliently on the galvanized area or with another anti-rust coating area ( 9 , 21 ) of the relevant connecting element ( 7 ) is pressed. 26. Rotary bearing according to claim 24 or 25, characterized in that the side sealing lip ( 39 ; 61 , 62 ) facing the roller bearing region ( 15-20 ) to be sealed projects into the air gap ( 15 ) between the two connection elements ( 7 , 8 ). 27. Rotary bearing according to claim 26, characterized in that the secondary sealing lip ( 39 ) projecting into the air gap ( 15 ) has a barb-shaped cross-section ( 40 , 41 ) and the elastic spreading on the opposite surfaces ( 16 , 17 ) of the two connecting elements ( 7 , 8 ) sealingly abuts. 28. Rotary bearing according to one of the preceding claims, characterized in that on the part ( 31 ) of the elastic sealing ring ( 25 ; 48 ; 56 ) overlapping the air gap ( 15 ), in particular beyond the secondary sealing lip projecting into the air gap ( 15 ) ( 39 ), an extension ( 30 ) with a bead-like or spring-like cross-section is integrally formed on this sealing ring ( 25 ; 48 ; 56 ) in the circumferential direction, around the elastic sealing ring ( 25 ; 48 ; 56 ) in a groove-shaped recess ( 29 ) to attach this connecting element ( 8 ). 29. Rotary bearing according to claim 28, characterized in that the extension ( 30 ) with a bead-like or spring-like cross-section has profiles, for example. With a sawtooth-shaped cross-section, in order to bring about a high anchoring force in the groove-shaped depression ( 29 ) by elastic spreading forces. 30. Pivot bearing according to claim 28 or 29, characterized in that the depth of the groove-shaped recess ( 29 ) for receiving the extension ( 30 ) of the elastic sealing ring ( 25 ; 48 ; 56 ) approximately perpendicular to the air gap ( 15 ) between the two connection elements ( 7 , 8 ) runs. 31. Rotary bearing according to one of claims 28 to 30, characterized in that the groove-shaped recess ( 29 ) for receiving the extension ( 30 ) of the elastic sealing ring ( 25 ; 48 ; 56 ) is located outside the air gap ( 15 ). 32. Rotary bearing according to one of the preceding claims, characterized in that one or both connection elements ( 7 , 8 ) outside the sealed area ( 15-20 ) are provided with a galvanizing or other rust protection layer ( 21 ). 33. Rotary bearing according to claim 32, characterized in that the groove-shaped (s) or groove-like recess (s) ( 26 , 29 ; 45 ; 54 ) for receiving the corrosion-free ring ( 24 ; 44 ; 53 ) and / or an extension ( 30 ) of the elastic sealing ring ( 25 ; 48 ; 56 ) is not (are) affected by a rust protection treatment of the connecting element in question, in particular a galvanizing. 34. Rotary bearing according to one of the preceding claims, characterized in that all cavities in the entire sealing area ( 22 , 23 ; 43 ; 52 ), in particular also the area between the main and / or secondary sealing lips ( 33 , 35 , 36 , 39 ; 49 , 50 ; 56 , 57 , 61 , 62 ), is filled with grease.