rolling bearing arrangement

Abstract

A rolling bearing arrangement comprising a rolling bearing (2) with an inner ring (3), an outer ring (4) and several rolling elements (5) received between them, a cylindrical first support component (9) on which the inner ring (3) sits, and a second support component (22) on which the outer ring (4) sits, characterized in that the rolling bearing (2) is a spherical roller bearing (8), and the first support component (9) consists of two axially adjacent sleeves (10, 11), wherein the sleeves (10, 11) each have at least one slot (14, 15) in an area covered by the pressed-on inner ring (3).

Description

Field of invention

[0001] The invention relates to a rolling bearing arrangement comprising a rolling bearing with an inner ring, an outer ring and several rolling elements received between them, a cylindrical first support component on which the inner ring sits, and a second support component on which the outer ring sits. Background of the invention

[0002] Such a rolling bearing arrangement is suitable for various applications, one example being agricultural applications where such a bearing arrangement is frequently subjected to high and highly fluctuating loads. The rolling bearing of such an arrangement, particularly suitable for agricultural applications, is designed as a four-point bearing unit based on a ball bearing. The inner ring and the first support component can be formed as a single piece, meaning that the inner ring is integrally formed with the cylindrical support component. A second support component, in the form of a centrifugal disc, is arranged on the outer ring, which is usually spherical on its radial outer surface.

[0003] A generic rolling bearing is shown in publication CH 192 640 A.

[0004] However, as has been shown in practice, such a rolling bearing arrangement is subject to massive stresses as a result of the dynamic pendulum movements, which it cannot satisfactorily absorb, which is why damage to the rolling bearing arrangement or in particular to the four-point bearing unit, i.e. the rolling bearing, occurs in operation, up to and including failures. Object of the invention

[0005] Based on the disadvantages of the known prior art outlined above, the invention therefore aims to provide an improved rolling bearing arrangement. Description of the invention

[0006] To solve this problem, in a rolling bearing arrangement of the type mentioned above, it is provided according to the invention that the rolling bearing is a spherical roller bearing, and the first support component consists of two axially adjacent sleeves, wherein the sleeves each have at least one slot in an area covered by the pressed-on inner ring.

[0007] The rolling bearing arrangement according to the invention is characterized, firstly, by a spherical roller bearing with an inner ring having two slightly angled, spherical inner ring raceways and an outer ring with a spherical outer ring raceway, wherein corresponding spherical rollers run in two rows on the two inner ring raceways and the outer ring raceway. The design as a spherical roller bearing, or rather the spherical outer ring raceway, allows a relative tilting of the inner ring to the outer ring of at least ±2°, meaning that the spherical roller bearing can easily accommodate such tilting.

[0008] The spherical roller bearing is pressed onto the first support component with its inner ring. Typically, such press fits are achieved thermally by strongly cooling or heating one component, after which the two components—in this case, the inner ring and the first support component—are pushed together and, once room temperature has been reached, are firmly pressed together. Alternatively, mechanical pressing is also conceivable. These press-fit or shrink-fit methods are problematic insofar as the inner ring can be damaged. To remedy this in such a rolling bearing arrangement, the first support component is, according to the invention, in two parts. It consists of two axially adjacent, hollow cylindrical sleeves, each having at least one slot formed in the area overlapped by the inner ring.This slot, extending inwards from the adjoining end faces, creates a defined, reduced elasticity of the respective sleeve in the overlapping area, significantly facilitating the pressing process. This means that high mechanical pressing forces are not required, and shrinking through thermal treatment is unnecessary.

[0009] This makes the rolling bearing arrangement according to the invention easier to manufacture, resulting from the simple press-fit arrangement of the rolling bearing together with the second support component onto the first support component. Furthermore, compensation for tilting is also possible without the risk of damaging the rolling bearing.

[0010] The rolling bearing assembly, with its hollow cylindrical inner component (i.e., the two axially adjacent sleeves), is usually placed on a support pin or shaft and fixed there, for example, by means of an axial screw connection or similar.

[0011] The slots are preferably designed as axially extending longitudinal slots that run axially from an end face of the respective sleeve towards the center of the sleeve. However, they are only as long as they can be overlapped by the inner ring.

[0012] The inner ring itself is preferably received in a receiving groove on the first support member, i.e., in an area where the wall thickness of the first support member is reduced. To achieve this, according to the invention, radially outwardly open ring folds are provided on the sleeves, which together form a receiving groove in which the ring is received. The slots are also provided in this fold area, ensuring sufficient elasticity in this region while still maintaining sufficient stability in the first support member. Since the first support member is mounted on a pin, shaft, or the like, this pin or shaft provides the necessary stability in any case.

[0013] Preferably, the inner ring is axially sealed by a sealing ring in each ring groove. This ensures that dust and moisture are prevented from penetrating the bearing interior in this area and that any lubricant present inside the bearing is retained.

[0014] According to a practical embodiment of the invention, the second support component can project axially beyond the outer ring on both sides, with two annular sealing elements provided axially upstream of the rolling bearing. These sealing elements are arranged in the overlap area of ​​the second support component over the outer ring. They also serve to prevent the ingress of moisture and dust into the bearing interior and to retain the lubricant located inside the bearing.

[0015] One sealing element can be positioned directly between the second and first support components, while the other sealing element is positioned between a ring cover axially attached to the second support component and the first support component. If no such ring cover is used, the sealing element can also be positioned directly between the second and first support components on the second side.

[0016] When using such a ring cover, it is advantageous to provide an axially sealing sealing ring between the ring cover and the second support component, which also prevents the ingress of dirt and moisture into the interior of the bearing.

[0017] The sealing elements themselves are preferably designed as cassette seals, which allow a sufficiently large radial distance to be bridged or sealed, while at the same time being sufficiently stable.

[0018] Each cassette seal can have a U-shaped ring in cross-section with two side legs and a connecting transverse leg, one side leg of which is attached to the first support component. Furthermore, the cassette seal can have an annular sealing lip component with an outer retaining ring and an integrally formed sealing lip section, which is attached to the second support component or the ring cover. The sealing lip section preferably extends axially outwards with its sealing lips, meaning that the sealing lips are oriented in opposite directions, so that the ring with its vertically oriented transverse leg forms the axial end of the cassette seal.

[0019] Preferably, the side leg and / or the retaining ring is received in a radially open annular groove on the first support component and / or on the second support component and / or on the cover component. This annular groove, which is axially limited in each case, forms a corresponding stop with its axial shoulder, corresponding to the grooves on the first support component for receiving the inner ring, which defines the respective position; in the case of the annular grooves, this is the position of the cassette seal, and in the case of the grooves on the first support component, it is the position of the inner ring. Brief description of the drawings

[0020] The invention is explained below with reference to exemplary embodiments and the drawings. The drawings are schematic representations and show: Fig. 1 a schematic representation of a rolling bearing arrangement according to the invention, Fig. 2 a perspective view of a first sleeve of the support component, and Fig. 3 a perspective view of the second sleeve of the support component. Detailed description of the drawings

[0021] Fig. Figure 1 shows a rolling bearing arrangement 1 according to the invention, comprising a rolling bearing 2 with an inner ring 3 and an outer ring 4, and rolling elements 5 in the form of spherical rollers arranged in two rows between these, which roll on two spherical running surfaces 6 on the inner ring 3 and one spherical running surface 7 on the outer ring 4. It is therefore a spherical roller bearing 8, which is capable of accommodating or compensating for a tilting of at least + / -2° without sustaining damage.

[0022] Furthermore, a first support component 9 is provided, to which the inner ring 3 is attached. The first support component 9 consists of two sleeves 10, 11, which are hollow cylindrical and abut axially or, at most, are axially spaced apart from each other by a narrow outer gap. Each sleeve 10, 11 has a radially outwardly open fold 12, 13 in the area where the inner ring 3 overlaps the respective sleeve 10, 11. The two folds 12, 13 together form an annular groove. The overlap area of ​​sleeve 10 is longer than the overlap area of ​​sleeve 11. Each sleeve 10, 11 has, as shown in the perspective view according to the Fig. 2 and Fig. 3, each with a longitudinally extending slot 14, 15, which gives the respective sleeve section a certain elasticity that makes it easier to press the inner ring 3 onto the first support component 9 or the two sleeves 10, 11 respectively.

[0023] The folds 12, 13 each have axial shoulders 16, 17, which on the one hand serve as a stop for the inner ring 3. On the other hand, grooves 18, 19 are formed on the shoulders 16, 17, in which a sealing ring 20, 21 is received, which seals axially towards the inner ring 3.

[0024] Furthermore, a second support component 22, e.g., a housing component or the like, is provided, which projects axially beyond the rolling bearing 2 or the spherical roller bearing 8 on both sides. A stop shoulder 23 is formed on one side, against which the outer ring 4 rests. On the other side, a ring cover 24 is axially screwed onto the second support component 22 via several screw connections 25, with this ring cover 24 serving as a holder for a sealing element, which will be discussed below. A further axial sealing ring 26 is arranged between the ring cover 24 and the second support component 22, serving for axial sealing in this area.

[0025] On both sides axially adjacent to the spherical roller bearing 8, a sealing element 27, 28, each in the form of a cassette seal 29, 30, is arranged. Each cassette seal 29, 30 has a ring 31, 32 with a U-shaped cross-section, comprising two side legs 33, 34 and a transverse leg 35, 36 connecting them. The two rings 31, 32 are received by the radially inner side leg 33, 34 in a radially open annular groove 37, 38 on the sleeves 10, 11, with the shoulder 39, 40 there serving as a stop shoulder for the respective side leg 33, 34.

[0026] How Fig. Figure 1 shows that corresponding ring shoulders 58, 59 are formed on the two sleeves 10, 11 to form the corresponding shoulders 16, 17 and 39, 40.

[0027] Furthermore, the cassette seal 29, 30 comprises a sealing lip component 41, 42 with an outer retaining ring 43, 44 and a sealing lip component 45, 46 integrally formed thereon, each with laterally projecting sealing lips 47, 48 that bear against the respective transverse legs 35, 36 of the rings 31, 32. The retaining rings 43, 44 are received in corresponding ring folds 49, 50, which are formed on the second support component 22 and the ring cover 24 respectively, with the shoulders 51, 52 therein serving as stop shoulders.

[0028] Each of the sealing elements, i.e. the sealing rings 20, 21 and 26 as well as the cassette seals 29, 30, provides a seal for the bearing interior, so that dirt and moisture are retained, but at the same time a lubricant located inside the bearing is retained.

[0029] In the example shown, the rolling bearing arrangement 1 is pushed onto a pin 53 with the first support component 9 and axially supported there on a stop shoulder 54. A cover plate 55 is attached to the other side and fixed by means of a screw 56, which is screwed into a corresponding internal threaded bore 57 in the pin 53, with the cover plate 55 of the first support component 9 overlapping at its end face.

[0030] The characters, in particular Fig. Figure 1 merely shows a basic application and embodiment of the rolling bearing arrangement according to the invention. Of course, it is conceivable to design the sealing elements 27, 28 differently, for example, not as cassette seals or to implement the cassette seals with a different geometry. Likewise, it is conceivable to arrange the rolling bearing arrangement 1 on a component other than a journal, as shown, and similar configurations. Reference symbol list 1 Rolling bearing arrangement 2 rolling bearings 3 inner ring 4 outer ring 5 rolling elements 6 Running surface 7 Running surface 8 spherical roller bearings 9 Support component 10 sleeve 11 Sleeve 12 folds 13 folds 14 longitudinal slots 15 longitudinal slots 16 Shoulder 17 Shoulder 18 Nut 19 Nut 20 sealing rings 21 Sealing ring 22 Housing component 23. Shoulder stop 24 ring lids 25 screw connection 26 sealing ring 27 Sealing element 28 Sealing element 29 Cassette seal 30 cassette seals 31 Ring 32 Ring 33 Side thigh 34 Side thigh 35 transverse legs 36 transverse legs 37 ring fold 38 ring fold 39 Shoulder 40 Shoulder 41 Sealing lip component 42 Sealing lip component 43 retaining ring 44 retaining ring 45 Sealing lip component 46 Sealing lip component 47 Sealing lip 48 Sealing lip 49 ring fold 50 ring fold 51 Shoulder 52 Shoulder 53 cones 54 Shoulder stop 55 Cover plate 56 screw 57 Internal threaded hole 58 Ring shoulder 59 Ring shoulder

Claims

A rolling bearing arrangement comprising a rolling bearing (2) with an inner ring (3), an outer ring (4) and several rolling elements (5) received between them, a cylindrical first support component (9) on which the inner ring (3) sits, and a second support component (22) on which the outer ring (4) sits, characterized in that the rolling bearing (2) is a spherical roller bearing (8), and the first support component (9) consists of two axially adjacent sleeves (10, 11), wherein the sleeves (10, 11) each have at least one slot (14, 15) in an area covered by the pressed-on inner ring (3). Rolling bearing arrangement according to claim 1, characterized in that the slots are designed as axially extending longitudinal slots (14, 15). Rolling bearing arrangement according to claim 1 or 2, characterized in that radially outwardly open annular folds (12, 13) are provided on the sleeves, which together form a receiving groove in which the inner ring (3) is received. Rolling bearing arrangement according to claim 3, characterized in that the inner ring is axially sealed via a sealing ring (20, 21) in each ring flange (12, 13). Rolling bearing arrangement according to one of the preceding claims, characterized in that the second support component (22) projects axially beyond the outer ring (4) on both sides, and that two annular sealing elements (27, 28) are provided axially upstream of the rolling bearing (2). Rolling bearing arrangement according to claim 5, characterized in that a sealing element (27) is arranged between the second support component (22) and the first support component (9), and the other sealing element (28) is arranged between a ring cover (24) axially attached to the second support component (22) and the first support component (9). Rolling bearing arrangement according to claim 6, characterized in that an axially sealing sealing ring (26) is arranged between the ring cover (24) and the second support component (22). Rolling bearing arrangement according to one of claims 5 to 7, characterized in that the sealing elements (27, 28) are cassette seals (29, 30). Rolling bearing arrangement according to claim 8, characterized in that each cassette seal (29, 30) has a U-shaped ring (31, 32) in cross-section with two side legs (33, 34) and a transverse leg (35, 36) connecting them, which is arranged with one side leg (33, 34) on the first support component (9), and has an annular sealing lip component (41, 42) with an outer retaining ring (43, 44) and a sealing lip section (45, 46) formed thereon, which is arranged on the second support component (22) or on the ring cover (24). Rolling bearing arrangement according to claim 9, characterized in that the side leg (33, 34) and / or the retaining ring (43, 44) is received in a radially open ring groove (37, 38, 49, 50) on the first support component (9) and / or on the second support component (22) and / or on the cover component (24).

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