DE102016210319A1 - Cage segment of a tapered roller bearing - Google Patents

Abstract

The invention relates to a cage segment (1) of a tapered roller bearing (16) which has two side plates (2, 3) arranged parallel to one another and two webs (4, 5) which form a pocket (8) for receiving a rolling body (7b). in which the two side plates (2, 3) each have two legs (10, 11, 12, 13) which with their respective free end in the circumferential direction (9) of the raceways (19, 20) of the tapered roller bearing (16) away from the pocket (8). In order to optimally use such a cage segment (1) in a tapered roller bearing (16) and to produce inexpensively, it is provided that the two side plates (2, 3) unequal length and the two webs (4, 5) are the same length, that the Both side plates (2, 3) and the two webs (4, 5) in radial top view form a trapezoidal pocket (8) that the two webs (4, 5) parallel to the radial outer side (26) of one in the trapezoidal pocket (8 In each case, two legs (10, 12; 11, 13) together with one of the two webs (4; 5) have half a pocket (14; 15) for receiving a pocket immediately next to the trapezoidal pocket (8) arranged frustoconical rolling elements (7a, 7c) form, and that the legs (10, 11, 12, 13) with respect to the associated side plate (2, 3) at an angle of pivoting (α) are angled, which is greater than 0 ° and less than 90 °.

Description

The invention relates to a cage segment of a tapered roller bearing, which has two side plates arranged parallel to each other and two webs which are fixedly connected to form a pocket for receiving a rolling element, and in which the two side plates each have two legs, which with their respective free end point away from the pocket in the circumferential direction of the raceways of the tapered roller bearing.

Roller bearings usually consist of an inner ring, an outer ring and a plurality of arranged between these races rolling elements. In order to achieve a uniform load distribution, based on the circumference of the roller bearing uniformly distributed arrangement of the rolling elements and to prevent contact of the rolling elements with each other, the rolling elements are usually performed in a bearing cage. In large rolling bearings, which are used for example in rolling mills and in wind turbines, the bearing cages are often designed as a bolt cages or as window cages. A bolt cage comprises two complete side rings and a plurality of circumferentially equally distributed between the side rings arranged bolt. On the bolt each provided with a central bearing bore rolling elements is rotatably mounted. A window cage also has two complete side rings and a plurality of circumferentially equally distributed between the side rings arranged on axial webs. The side rings and the axial webs include several commonly referred to as windows or pockets spaces in each of which a cylindrical rolling element is guided.

Notwithstanding the full design, a window cage may also be formed of cage segments, which are either connected to each other or at least in the circumferential direction of the cage in contact with each other. In addition, cage segments are also known, which are arranged without being in contact with each other as separation and guide elements between the rolling elements.

With regard to the known segmented roller bearing cages, it can be stated that the fewer rolling bodies can be arranged in a cage segment, the greater the number of cage components which are necessary for constructing a complete rolling bearing cage. This has a detrimental effect on manufacturing costs, warehousing, transportation and cage assembly. Although in Mehrtaschenkäfigsegmenten, so for example a cage segment with four pockets, this disadvantage compared to a Eintaschenkäfig significantly reduced, but increases with increasing number of pockets, the tendency of the rolling elements and the cage segments in the rolling bearing. In addition, it must be noted that the more pockets a cage segment has, the higher is the impact energy with which such cage-filled cage segment can strike in operation against an immediately adjacent cage segment when overcoming a circumferential clearance. As a result, the cage wear in cage segments with many pockets is comparatively high. Finally, especially in large-diameter bearings, such as with a diameter of more than 0.5 meters, the respective cage segment the heavier and thus less easy to transport and assemble, the more pockets has such a cage segment.

To solve these technical problems was in the not previously published DE 10 2015 219 277 A1 already proposed a cage segment for a rolling bearing, which has two side plates and two webs which are fixedly connected to each other, wherein the two webs extend parallel to the axis of rotation of the rolling elements of the rolling bearing, and in which the two side plates and the webs a pocket for receiving a Forming rolling elements. In this cage segment is further provided that extend the two side plates on both sides of the pocket in the circumferential direction of the bearing so far that they together with one of the two webs each form a half pocket for receiving an immediately adjacent rolling element. The cage segment thus has a complete pocket and two half pockets, the latter being open in the circumferential direction of the rolling bearing. This cage segment can be used to form cages, which are used for example in cylindrical roller bearings, tapered roller bearings and spherical roller bearings. Since such, from DE 10 2015 219 277 A1 known cage segment more than just take up a rolling element and can lead, and it is also shorter in terms of its dimensions in the circumferential direction of the bearing than a generic cage segment with three and more complete pockets is to handle this comparatively easy, especially in the assembly of slewing bearings.

Compared to a segment cage, which is constructed of several cage segments, each with only one pocket for receiving each now a rolling element, the number of cage segments required in a rolling bearing can be halved with said cage segment. In addition, allows a built-up with these cage segments cage a rolling bearing for this a higher load rating, as compared to cage segments, which have only complete pockets, a higher number of rolling elements can be installed in such a bearing.

Moreover, by the construction of the known cage segment an axial and a in Circumference of the rolling bearing effective pocket game in each pocket and half pocket of the cage segment to be set in a simple manner. This ensures a pinch-free operation of a cage constructed with such cage segments in a roller bearing. This contributes not insignificantly that the rolling elements used in the two half-pockets of the cage segment are indeed axially guided at the end faces, but seen in the circumferential direction of the bearing only on one side. In addition, this can be from the DE 10 2015 219 277 A1 known cage segment move freely in all operating situations of the bearing in the range of the axial play and the radial clearance, so that a low friction development and therefore a low wear is to be expected on this and on the associated rolling elements.

The known cage segment can be made in one piece or composed of several individual parts. It can be made of a metal or plastic and produced for example by a steel casting process, by sintering, by a powder bed production, by means of an injection molding process or by means of a 3D printer. The respective advantages are known to the person skilled in the art.

The constructive structure of the DE 10 2015 219 277 A1 Known cage segment allows a very small endgame in the circumferential direction of a built-up of these cage segments rolling bearing, as compared to cage segments with only one pocket, the number of cage segments required to build a rolling bearing cage is significantly reduced, so that the summation of manufacturing tolerances is smaller.

Another advantage of this known cage segment is that although it accommodates more than one rolling element and leads, but still has a relatively low total mass. This is particularly advantageous because to a total cage composite cage segments to each other although a slight, but not negligible game in the circumferential direction of the bearing have. This game occurs between the end faces of each immediately adjacent cage segments. In the operation of such a rolling bearing, there are relative movements and shocks of two immediately adjacent cage segments, which have the more kinetic energy, the more pockets and the more rolling elements has such a cage segment. In this respect, said cage segment with its single complete pocket and its two half pockets represents an optimal compromise between cage segments with only one pocket and with two or more pockets.

Characterized in that the pointing in the circumferential direction of the bearing end faces of the cage segment are formed so that they form contact surfaces for application to the end faces of each immediately adjacent cage segments, it is ensured that the arranged in the cage segment rolling elements in all operating situations within the pocket game free can move and jamming of the same is avoided.

The constructive structure of the DE 10 2015 219 277 A1 known cage segment with its end two half pockets also leads to the fact that only one rolling element is taken in a complete bag, while two further rolling elements of half a bag each of this cage segment and a second half pocket of an immediately adjacent cage segment are embraced half. As a result, the cage segments of a rolling bearing by means of the rolling elements are also interlinked with each other, which is judged to be very advantageous compared to conventional cage segments with only one pocket or with several complete pockets.

Another cage segment of the type just mentioned is from the DE 10 2016 207 034 A1 known. The from the out of the DE 10 2015 219 277 A1 and the cage segments known from DE 10 2016 207 034 A1 are well suited for use in a cylindrical roller bearing, but for use in a tapered roller bearing these have no optimal structure. This is because the local pockets or half pockets have a rectangular geometry, so that in an arrangement of tapered rollers in these pockets on the inner edge of different protruding into the pockets start-up projections must be formed at which the frustoconical outer surface of the respective rolling element after overcoming a can start existing pocket game. The formation of such different start-up projections is associated with comparatively high production costs, which should be avoided.

Against this background, the invention is the object of the DE 10 2015 219 277 A1 and the DE 10 2016 207 034 A1 educate known cage segments so that they are optimally designed to accommodate frustoconical rolling elements and for installation in a tapered roller bearing.

This object is achieved by a cage segment with the features of claim 1. Advantageous developments are mentioned in the dependent claims.

The invention accordingly relates to a cage segment of a tapered roller bearing, which has two side plates arranged parallel to each other and two webs which are firmly connected to form a pocket for receiving a rolling element, and in which the two side plates each have two legs, which with their respective free Point away end of the pocket in the circumferential direction of the raceways of the tapered roller bearing.

In order to optimally use such a cage segment in a tapered roller bearing and to produce inexpensively, it is provided that the two side plates are unequal length and the two webs are the same length, that the two side plates and the two webs in a radial plan view form a trapezoidal pocket that the two webs are aligned parallel to the radial outer side of a trapezoidal pocket arranged frusto-conical rolling elements, that in each case two legs together with one of the two webs each form a half pocket for receiving a frustum-shaped roller body disposed immediately adjacent to the trapezoidal pocket, and that the legs with respect are aligned angled to the associated side plate at a Verschwenkungswinkel, which is greater than 0 ° and less than 90 °.

Due to the fact that the complete pocket and the two half pockets of this cage segment are optimally adapted to the truncated cone geometry of the rolling bodies of a tapered roller bearing by the said design and orientation of the walls delimiting the pockets, the pocket-side or half-pocket-side starting projections can also be produced cost-effectively, because they can all be made have the same length. In addition, the cage segment according to the invention is optimally adapted to the geometry of the raceways for the rolling elements on the inner ring and on the outer ring, which are known to be employed obliquely to the bearing longitudinal axis in a tapered roller bearing and thereby each have a large diameter and a small diameter raceway end.

According to an advantageous further feature, it is preferably provided that the legs of the cage segment are aligned in an angled manner in the direction of the pocket-distant axial side surface of the shorter side plate. As a result, the cage segment is optimally adapted to the frustoconical geometry of the rolling elements of a tapered roller bearing loaded axially essentially on one side.

Another feature of a cage segment formed according to the invention may be that the legs associated with the longer side plate are longer than the legs of the cage segment associated with the shorter side plate.

To form a cage for a tapered roller bearing with said cage segments is provided that several of these cage segments are arranged directly behind one another in the circumferential direction of the tapered roller bearing, wherein two legs of a first cage segment together with the two legs of the immediately adjacent cage segment each a complete, but divided pocket of Form cage for receiving a frusto-conical rolling element.

To further illustrate the invention, the description is accompanied by a drawing with exemplary embodiments. In this shows

1 a schematic radial plan view A on a features of the invention exhibiting cage segment for a tapered roller bearing,

2 a schematic radial plan view A on the cage segment according to 1 equipped with frustoconical rolling elements,

3 a schematic radial plan view A on two partially filled with rolling elements and end juxtaposed cage segments according to 2 , and

4 a schematic partial longitudinal section BB according to 3 by a tapered roller bearing with a cage segment according to the 1 to 3 ,

Accordingly, the show 1 to 4 a cage segment 1 a tapered roller bearing 16 comprising the features of the invention. The cage segment 1 consists of two parallel side plates 2 . 3 as well as two bars 4 . 5 forming a bag 8th for receiving a rolling element 7b are firmly connected. To the two side plates 2 . 3 close in the circumferential direction 9 of the raceways 19 . 20 tapered roller bearing 16 seen two legs each 10 . 11 ; 12 . 13 on, with their respective free end of the fully formed bag 8th of the cage segment 1 face away. To the cage segment 1 To produce cost-effective, are the thighs 10 . 11 ; 12 . 13 integral with the rest of the cage segment 1 manufactured, for example by means of an injection molding method or by means of a conventional Metallgießverfahrens.

According to the invention, this is for optimal use in a tapered roller bearing 16 trained cage segment 1 initially provided that the two side plates 2 . 3 are unevenly long while the two webs 4 . 5 are formed the same length. This is in 1 without too Length markings clearly visible. In this case, the larger the rolling element diameter of the frustoconical rolling element 7b associated side plate 2 Obviously longer than the smaller rolling element diameter associated side plate 3 ,

In 2 is illustrated by double arrows that also the lengths L1, L2 of the larger rolling element diameter of the frusto-conical rolling element 7a . 7c associated leg 10 . 11 are larger than the lengths L3, L4 of the smaller Wälzkörperdurchmesser associated leg 12 . 13 ,

It is also in 2 recognizable that the two webs 3 . 4 of the cage segment 1 each at a skew angle β to the longitudinal axis 25 or axis of rotation of the tapered roller bearing 16 are aligned, which is about 5 ° in the embodiment shown. The two side plates 2 . 3 and the two bridges 4 . 5 are thus connected to each other in such a way that they form a trapezoidal pocket in the radial plan view 8th form, in which a frustoconical rolling element 7b can be included. For this purpose, it is also provided that the two webs 4 . 5 parallel to the radial outside 26 one in the trapezoidal bag 8th arranged with little pocket clearance frustoconical rolling elements 7b are aligned.

Next show in particular the 1 and 2 that each two legs 10 . 12 ; 11 . 13 together with one of the two bars 4 ; 5 half a bag 14 . 15 each one immediately adjacent to the complete, trapezoidal bag 8th adjacent frusto-conical rolling elements 7a . 7c form. 2 clarifies that the thighs 10 . 11 ; 12 . 13 cage segment 1 in relation to the associated side plate 2 . 3 at a Verschwenkungswinkel α towards the pocket distal axial side surface 28 the shorter side plate 3 are aligned angled. This Verschwenkungswinkel α is greater than 0 ° and less than 90 °. In the illustrated embodiment, the Verschwenkungswinkel α on both sides in each case about 8 °.

To a cage 27 for the tapered roller bearing 16 to be formed according to 3 a plurality of cage segments designed according to the invention 1 . 1' in the circumferential direction of the tapered roller bearing 16 at the free ends of her thighs 10 . 12 ; 11 . 13 put together. As a result, each form two immediately adjacent half pockets 14 . 15 a complete but divided bag 14 / 15 , which also has a largely trapezoidal geometry. In the shared bag 14 / 15 then also becomes a frusto-conical rolling element 7c used.

The 1 and 2 also show that on the inside of the trapezoidal bag 8th as well as on the inside of the two half pockets 14 . 15 start-up projections 6 are formed, which run-up surfaces for tarnishing in the bag 8th or in the two half pockets 14 . 15 arranged rolling elements 7a . 7b . 7c exhibit. Because the full bags 8th and the two half pockets 14 . 15 formed shared bag 14 / 15 optimal to the geometry of the frustoconical rolling elements 7a . 7b . 7c are adjusted, all start-up projections 6 be geometrically identical and in particular the same length, whereby the production of such a cage segment 1 . 1' noticeably less expensive than when the full bags 8th as well as the two half pockets 14 . 15 as for a cylindrical roller bearing would have a rectangular geometry.

The cage segment 1 . 1' According to the invention may have on its axial outside and axial inside a polygonal Umfangssegmentgeometrie. Therefore, this points into the 1 to 4 shown cage segment 1 . 1' axially outside and axially in each case a first corner 23 . 23 ' as well as a second corner 24 . 24 ' on, by the angling of the thighs 10 . 11 . 12 . 13 were formed. The cage segment 1 . 1' However, without prejudice to the optimal pocket geometry or half-pocket geometry described, axially outside and axially inside can have a purely circular-segment-shaped geometry.

4 shows in a schematic sectional view BB according to 3 in that a cage segment according to the invention 1 . 1' formed cage 27 in a tapered roller bearing 16 can be arranged, which has an outer ring 18 with the already mentioned cordless outer career 20 as well as an inner ring 17 with an inner raceway 19 for frustoconical rolling elements 7c and two radially outwardly projecting ribs 21 . 22 having. The cage segments 1 . 1' are doing on the radial outer surface of the shelves 21 . 22 of the inner ring 17 guided.

LIST OF REFERENCE NUMBERS

1

cage segment

1'

Adjacent cage segment

2

Longer side plate

3

Shorter side plate

4

First walkway

5

Second pier

6

start-up projections

7a, 7b, 7c

Truncated conical rolling elements

8th

Full, frustoconical bag

9

Circumferential direction of the cylindrical roller bearing

10

First leg on the longer side plate 2

11

Second leg on the longer side plate 2

12

First leg on the shorter side plate 3

13

Second leg on the shorter side plate 3

14

First half bag of a cage segment

15

Second half pocket of a cage segment

14/15

Divided pocket made of two half pockets

16

Tapered roller bearings

17

Inner ring of tapered roller bearing

18

Outer ring of tapered roller bearing

19

Running track on the inner ring

20

Raceway on the outer ring

21

Small board on the inner ring

22

Large board on the inner ring

23

First axially outer corner on the cage segment

23 '

First axially inner corner on the cage segment

24

Second axial outer corner on the cage segment

24 '

Second axially inner corner on the cage segment

25

Rotary axis of the tapered roller bearing

26

Radial outside of a rolling element

27

Cage formed by several cage segments 1 . 1'

28

Pocket distal axial side surface of the shorter side plate 3

α

Swiveling angle of the legs

β

Incline angle of the webs

L1

Length of the thigh 10

L2

Length of the thigh 11

L3

Length of the thigh 12

L4

Length of the thigh 13

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102015219277 A1 [0005, 0007, 0009, 0012, 0013, 0014]
• DE 102016207034 A1 [0013, 0014]

Claims (4)

Cage segment ( 1 . 1' ) of a tapered roller bearing ( 16 ), which two parallel side plates ( 2 . 3 ) and two webs ( 4 . 5 ), which forms a bag ( 8th ) for receiving a rolling element ( 7b ) are firmly connected to each other, and in which the two side plates ( 2 . 3 ) two legs each ( 10 . 11 ; 12 . 13 ), which with their respective free end in the circumferential direction ( 9 ) of the careers ( 19 . 20 ) of the tapered roller bearing ( 16 ) from the bag ( 8th ), characterized in that the two side plates ( 2 . 3 ) unequal length and the two webs ( 4 . 5 ) are the same length that the two side plates ( 2 . 3 ) and the two bridges ( 4 . 5 ) in radial plan view a trapezoidal pocket ( 8th ) form that the two webs ( 4 . 5 ) parallel to the radial outside ( 26 ) one in the trapezoidal pocket ( 8th ) arranged frustoconical rolling elements ( 7b ) are aligned so that in each case two legs ( 10 . 12 ; 11 . 13 ) together with one of the two bars ( 4 ; 5 ) half a bag ( 14 ; 15 ) for receiving an immediately adjacent to the trapezoidal pocket ( 8th ) arranged frustoconical rolling elements ( 7a . 7c ), and that the legs ( 10 . 11 ; 12 . 13 ) in relation to the associated side plate ( 2 . 3 ) are angled at a Verschwenkungswinkel (α), which is greater than 0 ° and less than 90 °. Cage segment according to claim 1, characterized in that the legs ( 10 . 11 ; 12 . 13 ) towards the pocket distal axial side surface ( 28 ) of the shorter side plate ( 3 ) are directed angled towards. Cage segment according to claim 1 or 2, characterized in that the longer side plate ( 2 ) associated leg ( 10 . 11 ) are longer than the shorter side plate ( 3 ) associated leg ( 12 . 13 ). Cage segment according to one of claims 1 to 3, characterized in that a plurality of these cage segments ( 1 . 1' ) to form a cage ( 27 ) in the circumferential direction ( 9 ) of the tapered roller bearing ( 16 ) are arranged directly behind one another, wherein two legs ( 11 . 13 ) of a first cage segment ( 1 ) together with the two thighs ( 10 . 12 ) of the immediately adjacent cage segment ( 1' ) a complete but divided bag ( 14 / 15 ) of the cage ( 27 ) form.

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