WO2012098039A1

WO2012098039A1 - Double-row angular-contact roller bearing

Info

Publication number: WO2012098039A1
Application number: PCT/EP2012/050400
Authority: WO
Inventors: Jörg-Oliver Hestermann; Gerhard Nagengast
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2011-01-20
Filing date: 2012-01-12
Publication date: 2012-07-26
Also published as: DE102011002898A1

Abstract

The invention relates to an angular-contact roller bearing, having an outer bearing ring (1) and having an inner bearing ring (15) and having raceways (2, 6), which are inclined at an angle with respect to the bearing longitudinal axis so as to be set in an O-shaped arrangement, of the bearing rings (1, 15), on which raceways roll cylindrical rolling bodies (10) which are arranged in two rows adjacent to one another, wherein the outer bearing ring (1) is of non-split design and is formed without rims, wherein the inner bearing ring (15) is likewise of non-split design and is formed without radially outer rims, and in which the smallest inner diameter of the outer bearing ring (1) is larger than the largest outer diameter of the inner bearing ring (15). For simplification of assembly and to improve bearing strength, it is provided that, for radially outer lateral rim guidance of the rolling bodies (10), bandages (13) or rings (17) are arranged in an axially immovable manner at both sides of the raceways (6) of the inner bearing ring (15).

Description

Name of the invention

Double row tapered roller bearing Description

Field of the invention

The invention relates to a tapered roller bearing, with an outer bearing ring and an inner bearing ring and inclined at an angle to the longitudinal axis of the bearing in O arrangement employed raceways of the bearing rings on which roll in two rows juxtaposed cylindrical rolling elements, the outer bearing ring undivided and without Borde is formed, wherein the inner bearing ring is also formed undivided and without radially outer rims, and in which the smallest inner diameter of the outer bearing ring is greater than the largest outer diameter of the inner bearing ring.

Background of the invention

Such a double-row tapered roller bearing is described in DE 199 37 660 AI. Since this multi-row tapered roller bearing has no rims on the outer and inner rings, the cylindrical rolling elements are guided in a cage which is formed from two sections which are positively connected to each other at their ends facing each other. The sections of the cage are formed as a mirror image plane cage bands consisting of individual, pockets forming segments. The segments are connected to each other in the circumferential direction by intermediate parts and both cage bands have at their mutually facing ends first engagement parts, in which engages a cohesive connecting part in the form of a wire ring. In this way, a hinge-like composite cage is formed and the cage bands are associated with each other so that a segment of the one cage strip engages in a free space formed by two adjacent segments of the other cage strip. The cage bands have at their opposite ends second engagement parts, in each of which engages a further wire ring. For this known double row tapered roller bearing is in DE 10 2006 012 785 AI stated that the leadership of the cylindrical rolling elements only by the cage, ie without rims, takes place on the bearing rings. To avoid this, it is proposed in accordance with DE 10 2006 012 785 A1 to design the outer bearing ring undivided and to provide it with starting bores for the cylindrical rolling bodies. In addition, the inner ring is radially divided and has no thrust shelves. The leadership of the cylindrical rolling elements is formed by inner rims on a separately formed guide ring, which is centered at a radial end on its outer surface by the outer bearing ring and is encompassed at the other radially opposite end of the inner bearing ring. The two-part inner bearing ring is assembled by a clamp-like fastening element.

Against this background, the present invention seeks to propose a double-row tapered roller bearing, which consists of a few parts and is thus simple, easy to assemble, able to absorb large radial and axial loads, can be produced with high accuracy, with a predefinable Preloaded and is particularly suitable for Kippmomentlager- applications.

Summary of the invention Starting from this task is proposed in a double-row tapered roller bearing of the type mentioned above that the raceways of the inner bearing ring bandages or rings are arranged axially immovable to the radially outer lateral board guide the rolling elements, the rolling bodies facing side surfaces thrust shelves to the radially outer side Forming guide of the rolling elements.

A second solution of the aforementioned object is to provide the inner bearing ring with a board or paragraph, wherein the smallest inner diameter of the outer bearing ring is greater than the largest outer diameter of the region of the inner bearing ring without board or heel, and that for lateral boarding of the rolling elements at least on the side without board or paragraph a bandage or a ring next to the track is arranged axially immovable. According to a third solution to the object of the invention is proposed in a double-row tapered roller bearing of the type mentioned without radially outer rims or shoulders on the inner bearing ring, that each raceway is bounded by rims on the inner bearing ring to the radially inner lateral boarding of the rolling elements, and that are provided according to the radially outer lateral guide of the rolling elements according stiff segment cages, which are connected to each other via plug outer segments.

The three solutions of the above-mentioned object are characterized in that both the outer bearing ring and the inner bearing ring are executed undivided, which improves the rigidity of the bearing assembly in the assembled state and the application of an axial and radial bias by mounting with a sufficiently heated allows outer bearing ring, without filling plugs would be required. Fiierbei is provided that for the preparation of a preloaded tapered roller bearing, the gap between the two bearing rings with the rolling elements can be filled when a predetermined temperature difference between the two bearing rings is set.

The double-row tapered roller bearing according to the invention can be particularly advantageous as rotary axis storage in the tool, printing and textile machinery, for storage of wind turbines, robotic arms, rotary tables and tracking systems of solar systems and the like use when mounting holes are arranged in the outer and inner bearing ring to the double-row tapered roller bearings with the corresponding adjacent structures to connect positively and / or non-positively.

The bandages or rings are preferably fixed immovably by shrinking on the inner bearing ring.

If the bandages consist of spring plate rings or of cut-to-length endless bands with overlapping ends, they can advantageously be fastened by screwing, pinning or welding to the inner bearing ring. If the outer lateral Bordführung takes place by massive steel rings, these steel rings may have axial, circumferential projections, which are at a small distance from radial side As a result, the steel rings at the same time form an additional, gap-forming seal against unintentional leakage of grease to the outside.

According to another embodiment may be attached to the bandages plastic rings with axial circumferential projections, which are arranged at a small distance to or sliding on radial side surfaces of the outer bearing ring and thereby form a seal against inadvertent leakage to the outside. This can also increase the fat space in the bearing and increase the service life of the grease lubrication. According to another variant it can be provided that the rolling elements are guided by plastic cage segments which seal the tapered roller bearing to the outside.

Finally, the invention relates to the use of the tapered roller bearing according to at least some of said features with mounting holes in the outer and inner bearing ring as a rotary axis storage in tool, printing and textile machinery, for the storage of wind turbines, robot arms, as well as tracking systems of solar systems or other devices.

Short description of the drawing

The invention will be explained below with reference to several embodiments shown in the drawing. In the drawing shows

1 shows a first embodiment of a double-row oblique roller bearing according to the invention, in which the guidance of the rolling bodies takes place by means of a rigid segment cage,

2 shows a second embodiment of the double-row tapered roller bearing according to the invention, in which the guidance of the rolling elements takes place by means of bandages arranged on both sides of the rows of rolling bodies on the inner ring, 3 shows an embodiment of the double row tapered roller bearing according to the invention according to FIG. 2 with sealing rings made of plastic, FIG.

4 shows a further embodiment of the double-row oblique roller bearing according to the invention, in which the guidance of the rolling elements is effected by solid metal rings arranged on either side of the rows of rolling elements,

Fig. 5 shows an inventive double-row tapered roller bearing according to FIG. 2 with a seal by outer segments of the cage, and

Fig. 6 shows a further embodiment of the double-row tapered roller bearing according to the invention, in which the leadership of the rolling elements is effected by a board on the inner bearing ring and on the axially other side by a bandage. Detailed description of the drawing

Of the various embodiments of the double-row tapered roller bearing according to the invention only one half of the bearing is shown in longitudinal section, and there are in the figures 2 to 6 important only for understanding and the reference numerals differing from Fig. 1 entered reference numerals.

The embodiment of FIG. 1 has an outer bearing ring 1 with in the illustrated embodiment, at approximately 90 ° to each other inclined raceways 2 and end-side radial side surfaces 4 and with the outer bearing ring 1 traversing mounting holes 3. In addition, this tapered roller bearing an inner bearing ring 5 with complementary to the raceways 2 raceways 6, which are bounded radially inward by rims 7. On the raceways 2 and 6 cylindrical rolling elements 10 are arranged in two rows, which are guided by rigid segment cages 11. The segment cages 11 are connected to each other by pluggable outer segments 12.

The inner bearing ring 5 likewise has axial fastening bores 9 and has a shoulder web-shaped shoulder 8, which covers an end face of one of the pluggable outer segments 12, to protect it from external influences. The radially inner lateral on-board guidance of the rolling bodies 10 takes place through the radially inner ribs 7, while the radially outer lateral on-board guidance of the rolling bodies 10 takes place through the rigidly executed segment cages 11. Since the smallest inner diameter of the outer bearing ring 1 is greater than the largest outer diameter of the inner bearing ring 5, the double row tapered roller bearing can be mounted in such a way that first the rolling elements 10 are mounted with their segment cage 11 on the right side of the inner bearing ring 5 and the Outer segments 12 are attached to the segment cage 1 1, after which the outer bearing ring 1 is pushed axially from the left onto the inner bearing ring 5 until it rests against the rolling elements 10. Thereafter, the second segment cage 11 is inserted into the space between the raceways 2, 6 and then the rolling elements 10. Subsequently, this second segment cage 1 1 is closed by the plug outer segments 12 and the inventive double-row tapered roller bearing is mounted ready to install.

A desired preload and backlash of the double-row tapered roller bearing according to the invention can be achieved in that the outer bearing ring 1 is sufficiently heated prior to assembly. When the outer bearing ring 1 cools after completion of the assembly, it contracts and produces the desired preload and backlash.

The embodiment according to FIG. 2 differs from the embodiment according to FIG. 1 in that the radially outer lateral on-board guidance of the rolling elements 10 takes place by means of bandages 13 arranged on both sides of the raceways 6 of the inner bearing ring 5. The rolling elements 10 facing side surfaces of the bandages 13 are chamfered according to the angle of the rolling elements 10 and form the Anlaufborde for the rolling elements 10 for radially outer lateral boarding. The right bandage 13 abuts axially on the shoulder 8 of the inner bearing ring 5 and is thereby axially fixed. The left bandage 13 can be shrunk onto the outer peripheral surface of the inner bearing ring 5 if it is designed as a spring metal sheet ring and is axially fixed by the shrinkage stress. In this embodiment, a desired preload and backlash can be achieved as well as in the embodiment of FIG. The embodiment of FIG. 3 has over the embodiment of FIG. 2 on the bandages 13 arranged plastic rings 14 with axial, circumferential projections 24 which are arranged at a small distance to or sliding on the radial end-side side surfaces 4 of the outer bearing ring 1. The design of these plastic rings 14 results in an enlarged fat receiving space, resulting in a longer service life of the grease filling.

Another embodiment of the double row tapered roller bearing according to the invention is shown in FIG. This embodiment differs from the previous embodiments according to FIGS. 1 to 3 in that, instead of the bandages 13, solid hardened steel rings 17 are shrunk onto the inner bearing ring 5. These steel rings 17 are provided with thrust surfaces 18 for Axialbordwirkung and further have axial circumferential projections 25 which are arranged at a small distance from the radial side surfaces 4 of the outer bearing ring 1 and protect the bearing interior against fat loss. This embodiment is provided with Kammsegmentkäfigen 16, which are not connected radially outside, since the radially outer lateral boarding of the rolling elements 10 by the hardened steel rings 17 and their contact surfaces 18 takes place. The embodiment of FIG. 5 differs from the embodiment of FIG. 2 in that the inner bearing ring 15 has no shoulder on its radial outer surface, so that both bandages 13 are fixed either by shrink fit on the inner bearing ring 15, or if the Bandages 13 consist of cut to length endless bands with overlapping ends, are fastened by screwing, pinning or welding on the inner bearing ring. In this embodiment, plastic cage segments 19 are provided with sealing effect by plugged outer segments 20.

In the embodiment of FIG. 6, the inner bearing ring 21 on its right side in the figure on a starting board 22 for the rolling elements, so that a guide through a bandage 13 or a steel ring 17 is not required on this page. In this embodiment, a segment cage 23 is provided, the individual segments of which are interconnected by sealing outer segments 20, as shown in Fig. 5, or individually, eg with overlaps. The segment cage 23 is here made of a plastic or a sheet metal.

In the embodiments according to Figures 2 to 6, the segment cages 11, 16, 19, 23 can be replaced by spacers, not shown, between the rolling elements 10, which ensure a leadership of the rolling elements 10 without tilting.

All embodiments according to Figures 1 to 6 are shown with radially inner rims 7, which are advantageous in the embodiments according to Figures 2 to 6, but need not necessarily be present.

By moving the center circle diameter, the size of the rolling elements can be selected. The massive inner bearing ring 5, 15, 21 and the short lever on the outer periphery can be expected high rigidity and usually require no additional support by the shaft to be stored, but only a centering on the same. The double-row tapered roller bearing according to the invention is of course also usable without the mounting holes 3 and 9, if the installation conditions do not require such mounting holes. Particularly advantageous is the use of the double-row tapered roller bearing according to the invention with mounting holes 3, 9 in the outer and inner bearing ring 1, 5, 15, 21 as rotary axis storage in tool, printing and textile machinery, for storage of wind turbines, robot arms, rotary tables, tracking systems of solar systems and the like, if at the same time high demands are placed on the tilting rigidity and at the same time good speed stability. LIST OF REFERENCE NUMBERS

1 outer bearing ring

2 raceways

3 mounting holes

4 radial side surfaces

5 inner bearing ring

6 raceways

7 Radial inner starting rims

8 paragraph

9 mounting holes

10 cylindrical rolling elements

11 Rigid Segment Cage

12 plug-in outer segments

13 bandages

14 plastic rings or segments

15 inner bearing ring

16 comb segment cages

17 steel rings

18 contact surfaces

19 plastic cage segments

20 outer segments

21 Inner bearing ring

22 start board

23 sheet metal segment cage, plastic segment cage

24 projection on the plastic ring

25 projection on the steel ring

Claims

claims

Tapered roller bearing, with an outer bearing ring (1) and an inner bearing ring (15) and inclined at an angle to the bearing longitudinal axis in O arrangement employed raceways (2, 6) of the bearing rings (1, 15), on which in two rows next to each other unrolled cylindrical rolling elements (10) roll, wherein the outer bearing ring (1) is formed undivided and without shelves, wherein the inner bearing ring (15) is also formed undivided and without radially outer rims, and wherein the smallest inner diameter of the outer bearing ring (1 ) is larger than the largest outer diameter of the inner bearing ring (15), characterized in that the radially outer lateral board guide of the rolling elements (10) on both sides of the raceways (6) of the inner bearing ring (15) bandages (13) or rings (17) axially are arranged immovably.

Tapered roller bearing, with an outer bearing ring (1) and an inner bearing ring (5, 21) and inclined at an angle to a bearing longitudinal axis in O arrangement employed raceways (2, 6) of the bearing rings (5, 21) on which in two Rolling rows arranged next to each other cylindrical rolling elements (10), wherein the outer bearing ring (1) is formed undivided and without shelves, wherein the inner bearing ring (5, 21) is also formed undivided, and the smallest inner diameter of the outer bearing ring (1) greater than the largest outer diameter of the inner bearing ring (5, 21), characterized in that the inner bearing ring (5, 21) has a board (22) or shoulder (8), that the smallest inner diameter of the outer bearing ring (1) is greater than that largest outer diameter of the region of the inner bearing ring (5, 21) without board or paragraph, and that for lateral guidance of the rolling elements (10) at least on the side without paragraph a bandage (13) ode r a ring (17) next to the raceway (6) of the inner bearing ring (5, 21) is arranged axially immovable.

Tapered roller bearing, with an outer bearing ring (1) and an inner bearing ring (5) and inclined at an angle to the bearing longitudinal axis in O arrangement employed raceways (2, 6) of the bearing rings (1, 5), on which in two rows next to each other arranged cylindrical rolling elements (10) roll, the outer Bearing ring (1) undivided and without rims is formed, wherein the inner bearing ring (5) is also formed undivided and without radially outer rims, and in which the smallest inner diameter of the outer bearing ring (1) is greater than the largest outer diameter of the inner bearing ring ( 5), characterized in that each raceway (6) of the inner bearing ring (5) to the radially inner lateral board guide by rims (7) on the inner bearing ring (5) is limited, and that corresponding to the radially outer lateral guide of the rolling elements (10) rigidly executed segment cages (11) are provided, which are connected via pluggable outer segments (12).

4. tapered roller bearing according to claim 1 or 2, characterized in that the bandages (13) or rings (17) are fixed immovably by shrinking on the inner bearing ring (5, 15, 21).

5. tapered roller bearing according to claim 1 or 2, characterized in that the bandages (13) consist of spring bellows rings or cut to length from endless belts with overlapping ends and by screwing, pinning or welding to the inner bearing ring (5, 15, 21) are attached.

6. tapered roller bearing according to claim 1, 2 or 4, characterized in that the rings (17) have axially encircling projections which are arranged at a small axial distance from the radial end face side surfaces (4) of the outer bearing ring (1).

7. tapered roller bearing according to one of claims 1, 2, 4 or 5, characterized in that on the bandages (13) plastic rings (14) with axial circumferential protrusions (24) are attached, which at a small distance to or sliding at radial

Side surfaces (4) of the outer bearing ring (1) are arranged.

8. tapered roller bearing according to one of claims 1, 2, 4 or 5, characterized in that the rolling elements (10) through the tapered roller bearing outwardly sealing plastic cage segments (19, 20) are guided. Tapered roller bearing according to one of claims 1 to 8, characterized in that it can be filled with its rolling elements for the production of a preloaded tapered roller bearing without the use of filler, when a temperature difference between the two layer rings (1, 5) is set.

Use of the tapered roller bearing according to one of claims 1 to 9 with mounting holes (3, 9) in the outer and inner bearing ring (1, 5, 15, 21) as a rotary axis bearing in tool, printing and textile machinery, for the storage of wind turbines, robot arms, of Tracking systems of solar systems and the like.