DE102015218862A1 - bearing arrangement - Google Patents

Abstract

The invention relates to a bearing assembly (1), comprising two roller bearings (2) each having an inner ring (3) and an outer ring and arranged between the bearing rings rolling elements (4), wherein the two rolling bearings (2) by relative displacement of the inner rings (3). and / or the outer rings in the axial direction (a) can be biased, wherein on the inner rings (3) and / or on the outer rings shelves (5) are arranged, which form an axial stop for the rolling elements (4), wherein at least one the ribs (5) relative to the supporting this bearing ring (3) in the axial direction (a) adjustable on the bearing ring (4) is arranged, wherein the adjustable board (5) and the bearing ring (3) provided with a thread (6) are, so that the board (5) by rotation in the axial direction (a) relative to the bearing ring (3) is adjustable, and wherein the adjustable board (5) and this bearing bearing ring (3) means (7), with which the board (5) axially adjustable on the bearing ring (3) can be determined. In order to set the preload in the bearing assembly easier and more accurate, the invention provides that the means (7) for axially fixing the board on the bearing ring (3) comprise at least one oil feed hole (7 ') in the board (5) is incorporated and which is designed for supplying a pressurized fluid in the region of the threads of the thread (6).

Description

The invention relates to a bearing arrangement, comprising two roller bearings each having an inner ring and an outer ring and arranged between the bearing rings rolling elements, wherein the two bearings can be biased by relative displacement of the inner rings and / or the outer rings in the axial direction or provided with a desired clearance, wherein on the inner rings and / or on the outer rings shelves are arranged, which form an axial stop for the rolling elements, wherein at least one of the shelves relative to the supporting bearing ring is arranged in the axial direction adjustable on the bearing ring, wherein the adjustable board and the Bearing ring are provided with a thread, so that the board is adjustable relative to the bearing ring by rotation in the axial direction, and wherein the adjustable board and this bearing bearing ring having means with which the board axially fixed to the bearing ring can be set.

A generic location arrangement is from the DE 10 2012 221 297 A1 known. Such bearing assemblies are - as in the aforementioned prior art case - often designed as tapered roller bearing assemblies. In earlier solutions, two cooperating tapered roller bearings are preloaded axially against each other. The adjustment of the preload tapered roller bearings is a relatively complex and inaccurate process, especially in earlier solutions. Attempts are made to set the correct preload by sliding the two inner rings of a tapered roller bearing unit axially towards each other (in the case of an O bearing arrangement) or axially away from each other (in the case of an X bearing arrangement). The correct displacement is determined by consuming measuring the components and adjusted by shims so that the desired bias arises after tightening the shaft nut, with which the entire bearing assembly is set on a shaft part.

Since the securing of the nut is achieved by means of a corresponding clamping force, it must again be accepted that the bearing preload set elaborately via shims is influenced by the generally very large clamping force. An exactly desired preload can be achieved with difficulty.

The above DE 10 2012 221 297 A1 offers here already advantages, since the relevant for the bias position of the board on the bearing ring of the tapered roller bearing can be adjusted by means of a thread. Is achieved by screwing the board on this bearing bearing ring the correct axial relative position between the board and bearing ring, the board is fixed to the bearing ring. This can be done by the previously known possibility in that the thread is partially deformed, so that the board can not be rotated relative to the bearing ring, ie permanently fixed.

A disadvantage of this solution, however, a certain axial length of the board is required; A sufficient space is not always available, so that the previously known solution is then not applicable. It may also be disadvantageous in view of any necessary disassembly dismantling the bearing assembly that the board from the bearing ring is no longer solved, d. H. can be unscrewed.

The invention has the object of providing a bearing assembly of the type mentioned in such a way that it is possible to fix the board on the bearing ring in tight spaces in a simple manner, the bias or the bearing clearance in the bearing assembly then simple and accurate can be adjusted. The bias or bearing air in the bearing assembly should thus be easier and more accurate to set.

The solution of this object by the invention is characterized in that the means for axially fixing the shelf to the bearing ring comprise at least one Ölzuführbohrung which is incorporated in the board and which is adapted for supplying a pressurized fluid in the region of the threads of the thread.

The means for axially fixing the shelf to the bearing ring may further comprise at least one pressure oil line, which communicates with an oil pump or can be brought into connection.

Preferably, a plurality of oil supply holes are provided, in particular three oil supply holes; these can be arranged equidistantly around the circumference of the board.

The at least one oil supply hole preferably penetrates the board completely in the radial direction.

Preferably, further sealing means are provided with which the thread is sealed in the bearing ring against the thread in the board. The sealing means can be formed according to a first preferred embodiment of the invention by a tapered thread (tapered Withworth pipe thread). Alternatively it is possible according to another preferred embodiment of the invention that the sealing means are formed by an armored pipe thread.

The Whitworth pipe thread is well known as such and especially for the mutual screwing of pipes and matching connecting parts provided. This type of thread is known both in a conical and in a cylindrical design, in which case the tapered embodiment is preferably used. Such conical threads are in the Standard EN 10226 described. The nominal diameter of the conical thread corresponds after a few turns that of the cylindrical counter-thread. Upon further tightening, the threads jam together and act as a metallic sealing. Of course, it may nevertheless be provided that in order to achieve a high degree of tightness prior to bolting, additional sealants such as teflon or hemp may be used to fill the remaining gaps.

Steel armored pipe threads (also called tank threads or steel-armored-pipe threads) are a group of threads with a flank angle of 80 °. Since the steel armored pipes used are usually relatively thin-walled, the thread depth is not very large. Such threads are in the DIN standard DIN 40430 described.

The two rolling bearings are preferably tapered roller bearings.

The shelves are preferably arranged on the inner rings.

Said thread is preferably a fine thread, so that the board is sensitive adjustable or adjustable by rotation in the axial direction relative to the bearing ring.

The proposed embodiment of a bearing assembly thus allows easy adjustment of the bias of a bearing unit, in particular a tapered roller bearing unit, on the axial displacement of a guide board. Furthermore, the fixation of the board on the supporting bearing ring is possible in a simple manner.

The concept of the invention therefore aims to provide an adjustable guide board on at least one of the bearing rings, which is easily adjustable with a pressure oil thread in its axial position relative to the bearing ring.

A more accurate adjustability of the bias or the axial clearance in the bearing arrangement - regardless of the effective tolerances - is given and of great advantage to the proposed concept. In the implementation of the same simplicity of the required components is equally beneficial. There is a guide board, which allows a sensitive axial adjustment and locking its position in a simple manner.

The concept is therefore based on an application that is known as such in the bearing assembly, namely the oil pressure dressing; This principle is used here to achieve an axial locking of the guide board on the bearing ring. To implement the axial adjustability of the guide board is preferably carried out with a "sealing" or possibly slightly conical thread, as it is known as such at Wasserrohrgewinden and fittings.

When adjusting the preload or internal clearance, the guide board is then screwed onto the bearing ring up to a certain number of revolutions. The board can then one or more, z. B. three, holes and pressure oil lines are brought to float on its seat on the bearing ring and then completely screwed into the final axial relative position. If the oil pressure is now turned off, the guide board sits firmly in place.

In a later re-assembly or disassembly of the guide board can be made in turn with a corresponding oil pressure introduction and then adjusted by rotation to the desired game or the desired bias. It is advantageous here, the thread - unlike a standard thread - run without a free gap in the head and foot area, in order to have no pressure loss here. However, this is given in sealing pipe threads. Also, the non-conical thread at z. B. Panzerrohrgewinden allows this function; In this case, it may be necessary during initial assembly to work when attaching the rim ring with heating or in a similar manner.

Thus, via a functional integration, namely the separate, provided with oil holes and on the inside to the inner ring out with a sealing, preferably conical, threaded equipped Führungsbordring everything ready to unite the axial adjustability and secure locking into a component.

The exact adjustment of the bias leads advantageously to a reduced bearing friction.

If in the present case of the setting of a bias is mentioned, this is of course understood to mean that in the bearing assembly with the inventive design a defined game is set - and vice versa.

In the drawing, an embodiment of the invention is shown. Show it:

1 a sectional perspective view of a tapered roller bearing, which is part of a bearing assembly comprising two mutually braced tapered roller bearings,

2 an enlarged section of the bearing inner ring of the tapered roller bearing after 1 and

3 a further enlarged section of the bearing inner ring according to 2 ,

In 1 is a bearing arrangement 1 to see, which consists of two bearings, of which only one, namely the rolling bearing 2 , is shown. The rolling bearings are tapered roller bearings. The two rolling bearings 2 are biased against each other or they are provided with a defined bearing clearance. From the rolling bearing 2 is the inner ring 3 and the outer ring 8th shown, between the bearing rings rolling elements 4 are arranged.

For the purpose of adjusting the bearing clearance or preload, the inner ring 3 of the rolling bearing 2 with a thread 6 provided on a board 5 can be screwed on. If this happens, the axial position of the board changes 5 on the inner ring 3 (see axial direction a), so that for the contact surface of the rolling elements 4 a different position and in consequence a higher or lower degree of preload or bearing clearance results. The board 5 So it is designed as an adjustable board, ie it can in the axial direction a on the inner ring 3 be adjusted.

So after setting the desired axial position of the board 5 on the inner ring 3 this relative position between board 5 and inner ring 3 is fixed, are means 7 intended.

In the 2 and 3 you can see details about this.

The means 7 include first in the embodiment three oil supply hole 7 ' that the board 5 penetrate radially, allowing it from the outside in the area of the thread 6 Pressure oil is introduced. For this purpose (see 2 ) have the means 7 further pressure oil lines 7 '' and an oil pump 7 ''' on, making it possible in the area between the thread 6 ' in the bearing ring 3 (see this 3 ) and the thread 6 '' in the board 5 Apply pressure oil and thus to accomplish a radial expansion of the board.

In 3 It can also be seen that in the exemplary embodiment a conical thread is used, so that over the axial length of the thread 6 the radial distance between the thread 6 ' in the bearing ring and the thread 6 '' changed in the board.

Accordingly, there is the possibility of mounting the bearing assembly 1 the board 5 by screwing so far on the inner ring 3 to shift axially that results in the bearing assembly a desired preload or a desired bearing clearance. The production of the said oil pressure cushion between the threads 6 ' and 6 '' allows a sensitive adjustment of the bearing clearance or preload.

If then the oil pressure p (s. 2 ) taken away, the board sits 5 on the inner ring 3 firmly, so that the preload or the bearing clearance is fixed.

LIST OF REFERENCE NUMBERS

1

bearing arrangement

2

roller bearing

3

inner ring

4

rolling elements

5

shelf

6

thread

6 '

Thread in the bearing ring

6 ''

Thread in the board

7

Means for fixing the board

7 '

oil feed

7 ''

Pressure oil line

7 '' '

oil pump

8th

outer ring

a

axial direction

p

oil pressure

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 102012221297 A1 [0002, 0004]

Cited non-patent literature

• Standard EN 10226 [0012]
• DIN standard DIN 40430 [0013]

Claims (10)

Bearing arrangement ( 1 ), comprising two rolling bearings ( 2 ) each with an inner ring ( 3 ) and an outer ring and arranged between the bearing rings rolling elements ( 4 ), whereby the two rolling bearings ( 2 ) by relative displacement of the inner rings ( 3 ) and / or the outer rings in the axial direction (a) can be biased or provided with a desired clearance, wherein on the inner rings ( 3 ) and / or on the outer rings Borde ( 5 ) are arranged, which has an axial stop for the rolling elements ( 4 ), wherein at least one of the shelves ( 5 ) relative to the supporting this bearing ring ( 3 ) in the axial direction (a) adjustable on the bearing ring ( 4 ), wherein the adjustable board ( 5 ) as well as the bearing ring ( 3 ) with a thread ( 6 ), so that the board ( 5 ) by turning in the axial direction (a) relative to the bearing ring ( 3 ) is adjustable, and wherein the adjustable board ( 5 ) as well as the supporting bearing ring ( 3 ) Medium ( 7 ), with which the board ( 5 ) axially adjustable on the bearing ring ( 3 ), characterized in that the means ( 7 ) for axially fixing the board on the bearing ring ( 3 ) at least one oil feed hole ( 7 ' ) included in the board ( 5 ) is incorporated and for supplying a pressurized fluid in the region of the gears ( 6 ' . 6 '' ) of the thread ( 6 ) is trained. Bearing arrangement according to claim 1, characterized in that the means ( 7 ) for axially fixing the board on the bearing ring ( 3 ) at least one pressure oil line ( 7 '' ) provided with an oil pump ( 7 ''' ) or is communicable. Bearing arrangement according to claim 1 or 2, characterized in that a plurality of oil supply holes ( 7 ' ) are provided, in particular 3 Oil supply holes ( 7 ' ). Bearing arrangement according to claim 3, characterized in that the oil supply holes ( 7 ' ) equidistant around the circumference of the board ( 5 ) are arranged. Bearing arrangement according to one of claims 1 to 4, characterized in that the at least one Ölzuführbohrung ( 7 ' ) the board ( 5 ) completely penetrated radially. Bearing arrangement according to one of claims 1 to 5, characterized in that there are sealing means with which the thread ( 6 ' ) in the bearing ring ( 3 ) against the thread ( 6 '' ) in the board ( 5 ) is sealed. Bearing arrangement according to claim 6, characterized in that the sealing means are formed by a tapered thread (conical Whitworth pipe thread). Bearing arrangement according to claim 6, characterized in that the sealing means are formed by an armored pipe thread. Bearing arrangement according to one of claims 1 to 8, characterized in that the two rolling bearings ( 2 ) Are tapered roller bearings. Bearing arrangement according to one of claims 1 to 9, characterized in that the shelves ( 5 ) on the inner rings ( 3 ) are arranged.

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