DE102015218862B4 - bearing arrangement - Google Patents

Abstract

Bearing arrangement (1), comprising two roller bearings (2), each with an inner ring (3) and an outer ring, and roller bodies (4) arranged between the bearing rings, the two roller bearings (2) being displaced by relative displacement of the inner rings (3) and/or the Outer rings can be preloaded in the axial direction (a) or provided with a desired bearing clearance, flanges (5) being arranged on the inner rings (3) and/or on the outer rings, which form an axial stop for the rolling elements (4), whereby At least one of the rims (5) is arranged on the bearing ring (4) so that it can be adjusted relative to the bearing ring (3) that carries it in the axial direction (a), the adjustable rim (5) and the bearing ring (3) having a thread (6 ) are provided, so that the rim (5) can be adjusted relative to the bearing ring (3) by turning in the axial direction (a), and the adjustable rim (5) and the bearing ring (3) carrying it have means (7), with which the board (5) axially non-adjustable on La gerring (3), characterized in that the means (7) for axially fixing the rim on the bearing ring (3) comprise at least one oil feed bore (7') which is machined into the rim (5) and which is used to supply a Pressure fluid in the area of the gears (6 ', 6'') of the thread (6) is formed.

Description

The invention relates to a bearing arrangement, comprising two roller bearings, each with an inner ring and an outer ring, and roller bodies arranged between the bearing rings, the two roller bearings being preloaded by relative displacement of the inner rings and/or the outer rings in the axial direction or being provided with a desired internal clearance, with ribs being arranged on the inner rings and/or on the outer rings, which form an axial stop for the rolling elements, with at least one of the ribs being arranged on the bearing ring so that it can be adjusted in the axial direction relative to the bearing ring carrying it, with the adjustable rib and the Bearing rings are threaded so that the board can be adjusted relative to the bearing ring by turning in the axial direction, and the adjustable board and the bearing ring carrying it have means with which the board can be fixed axially non-adjustably on the bearing ring.

A generic location arrangement is from DE 10 2012 221 297 A1 known. As in the known case mentioned, such bearing arrangements are often designed as tapered roller bearing arrangements. In earlier solutions, two interacting tapered roller bearings are axially preloaded against one another. Adjusting the preload in tapered roller bearings is a relatively complex and imprecise process, especially in earlier solutions. An attempt is made to set the correct preload by shifting the two inner rings of a tapered roller bearing unit axially towards one another (in the case of an O bearing arrangement) or axially away from one another (in the case of an X bearing arrangement). The correct displacement path is determined by laboriously measuring the components and adjusted using shims in such a way that the desired preload is achieved after tightening the shaft nut, with which the entire bearing arrangement is fixed on a shaft part.

DE 10 2012 221 297 A1 describes a bearing arrangement with two roller bearings, each with an inner ring and an outer ring, and roller bodies arranged between the bearing rings, with the two roller bearings being able to be preloaded in the axial direction by relative displacement of the inner rings and/or the outer rings, with the inner rings and/or the Outer rings ribs are arranged, which form an axial stop for the rolling elements. In order to be able to set the preload in the bearing arrangement more easily and precisely, the invention provides that at least one of the rims is arranged on the bearing ring so that it can be adjusted in the axial direction relative to the bearing ring that carries it.

DE 20 2015 001 277 U1 describes a structural unit for the axial clamping of roller bearings on axles and shafts with at least one axially acting pressure chamber, which is formed by an annular body and which is acted upon by a pressure fluid through a number of connection bores, the pressure chamber being formed circumferentially around the central axis of the structural unit is, and the radially inner wall of the pressure chamber is formed by a portion of the axle or shaft, wherein the rolling bearing comprises at least one bearing inner ring, a number of rolling elements and a bearing outer ring.

EP 1 956 253 A1 describes a rolling bearing device that is used under a preload and has a preload holding unit in which, when a fluid pressure in a fluid supply channel is higher than a first set pressure, a fluid in the fluid supply channel is supplied to a pressure chamber via a check valve, and when the pressure is lower than becomes the first set pressure, the fluid is supplied from a hydraulic pump to the pressure chamber via the check valve. When the pressure becomes higher than a second target pressure, the fluid is discharged from the pressure chamber via a relief valve, and also when the pressure inside the pressure chamber becomes higher than a third target pressure but higher than the first target pressure is lower than the second set pressure is, the supply of the fluid is stopped. In this preload holding unit, the pressure in the pressure chamber is held at a level between the first and second set pressures.

Since the nut is secured by a corresponding clamping force, one has to accept that the bearing preload, which is laboriously set using shims, is influenced by the generally very high clamping force. An exactly desired preload can only be achieved with difficulty.

The above DE 10 2012 221 297 A1 already offers advantages here, since the position of the rim relevant for the preload on the bearing ring of the tapered roller bearing can be adjusted by means of a thread. If the correct axial relative position between the rim and the bearing ring is achieved by screwing the rim onto the bearing ring that carries it, the rim is fixed to the bearing ring. According to the previously known possibility, this can be done by partially deforming the thread so that the rim can no longer be twisted relative to the bearing ring, ie it is permanently fixed.

The disadvantage of this solution, however, is that the rim requires a certain axial length; sufficient installation space is not always available, so that the previously known solution then cannot be used. It can also be disadvantageous that the rim can no longer be detached from the bearing ring, ie unscrewed, in view of any dismantling of the bearing arrangement that may become necessary.

The object of the invention is to develop a bearing arrangement of the type mentioned at the outset in such a way that it is possible to fix the rim on the bearing ring in a simple manner even in tight spaces, with the preload or the bearing play in the bearing arrangement then being easily and precisely controlled can be adjusted. The preload or bearing clearance in the bearing arrangement should thus be able to be adjusted more easily and more precisely.

The solution to this problem by the invention is characterized in that the means for axially fixing the rim on the bearing ring comprise at least one oil feed hole which is machined into the rim and which is designed to feed a pressurized fluid into the area of the turns of the thread.

The means for axially fixing the flange on the bearing ring can also include at least one pressure oil line which is connected or can be connected to an oil pump.

A plurality of oil feed bores are preferably provided, in particular three oil feed bores; these may be equidistant around the perimeter of the shelf.

The at least one oil feed hole preferably penetrates the rim completely in the radial direction.

Sealing means are preferably also present, with which the thread in the bearing ring is sealed against the thread in the rim. According to a first preferred embodiment of the invention, the sealing means can be formed by a conical thread (conical Whitworth pipe thread). According to another preferred embodiment of the invention, it is alternatively possible for the sealing means to be formed by an armored pipe thread.

The Whitworth pipe thread is well known as such and is primarily intended for the mutual screwing of pipes and matching connecting parts. This type of thread is known in both a conical and a cylindrical design, with the conical embodiment being preferably used here. Such tapered threads are described in the EN 10226 standard. After a few turns, the nominal diameter of the conical thread corresponds to that of the cylindrical mating thread. If tightened further, the threads jam together and thus have a metallic sealing effect. Of course, it can still be provided that, in order to achieve a high degree of tightness, additional sealants such as Teflon or hemp are used before screwing to fill the remaining gaps.

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

The two roller bearings are preferably tapered roller bearings.

The rims are preferably arranged on the inner rings.

Said thread is preferably a fine thread, so that the rim can be sensitively adjusted or set by turning in the axial direction relative to the bearing ring.

The proposed configuration of a bearing arrangement thus allows a simple adjustment of the preload of a bearing unit, in particular a tapered roller bearing unit, via the axial displacement of a guide rim. Furthermore, the fixation of the rim on the bearing ring that carries it is possible in a simple manner.

The concept according to the invention is therefore based on providing an adjustable guide flange on at least one of the bearing rings, which can be easily adjusted in its axial position relative to the bearing ring with a pressure oil thread.

A more precise adjustability of the prestressing or the axial clearance in the position arrangement—regardless of the effective tolerances—is given and is a great advantage of the proposed concept. When implementing the same, the simplicity of the required components is equally advantageous.

There is a guide board that allows a sensitive axial adjustment and a locking of its position in a simple manner.

The concept is thus based on an application known as such in bearing assembly, namely the oil pressure union; this principle is used here to achieve an axial locking of the guide flange on the bearing ring. In order to implement the axial adjustability, the guide flange is preferably made with a "sealing" or possibly slightly conical thread out, as is known as such in water pipe threads and fittings.

When setting the preload or bearing clearance, the guide flange is then screwed onto the bearing ring up to a certain number of revolutions. The board can then have one or more, e.g. B. three, holes and pressure oil lines are brought to float on its seat on the bearing ring and then fully screwed into the final relative axial position. If the oil pressure is now shut off, the guide rib will sit firmly in place.

When reassembling or disassembling later, the guide rib can again be made movable with a corresponding oil pressure introduction and then adjusted to the desired play or the desired pretension by turning it. It is advantageous for the thread - in contrast to a standard thread - to be designed without a free gap in the head and foot area so that there is no pressure loss here. However, this is the case with sealing pipe threads. Even the non-conical thread design, e.g. B. Armored pipe threads allow this function; it may be necessary during initial assembly to work with heating or in a similar way when attaching the edge ring.

Thus, everything is provided via a functional integration, namely the separate guide rim ring provided with oil bores and equipped with a sealing, preferably conical, thread on the inside towards the inner ring, in order to combine the axial adjustability and secure locking in one component.

Precise adjustment of the preload advantageously leads to reduced bearing friction.

If the setting of a preload is discussed here, this should of course also be understood to mean that a defined play is set in the bearing arrangement with the configuration according to the invention—and vice versa.

• 1 in geschnittener perspektivischer Darstellung ein Kegelrollenlager, das Bestandteil einer Lageranordnung ist, die zwei gegeneinander verspannte Kegelrollenlager umfasst,
• 2 einen vergrößerten Ausschnitt des Lagerinnenrings des Kegelrollenlagers nach 1 und
• 3 einen weiter vergrößerten Ausschnitt des Lagerinnenrings gemäß 2.

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

• 1 a sectional perspective view of a tapered roller bearing that is part of a bearing assembly that includes two tapered roller bearings braced against each other,
• 2 shows an enlarged detail of the inner ring of the tapered roller bearing 1 and
• 3 a further enlarged detail of the bearing inner ring according to 2 .

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

For the purpose of setting the bearing play or the preload, the inner ring 3 of the roller bearing 2 is provided with a thread 6 onto which a rim 5 can be screwed. If this occurs, the axial position of the rim 5 changes on the inner ring 3 (see axial direction a), so that the contact surface of the rolling elements 4 has a different position and, as a result, a higher or lower degree of preload or bearing play results. The board 5 is designed as an adjustable board, i. H. it can be adjusted on the inner ring 3 in the axial direction a.

Means 7 are provided so that after the desired axial position of the rim 5 on the inner ring 3 has been set, this relative position between the rim 5 and the inner ring 3 is fixed.

In the 2 and 3 details can be found on this.

In the exemplary embodiment, the means 7 initially comprise three oil feed bores 7′, which penetrate the rim 5 radially and thus make it possible for pressure oil to be introduced from the outside into the area of the thread 6. For this (see 2 ) the means 7 also have pressure oil lines 7" and an oil pump 7"', which makes it possible to get into the area between the threads 6' in the bearing ring 3 (see 3 ) and the 6" thread in the rim 5 to introduce pressure oil and thus achieve a radial expansion of the rim.

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

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

If the oil pressure p (s. 2 ) removed, the rim 5 sits firmly on the inner ring 3, so that the preload or the bearing play is fixed.

Reference List

1

bearing arrangement

2

roller bearing

3

inner ring

4

rolling elements

5

board

6

thread

6'

thread in the bearing ring

6''

thread in the board

7

Means for fixing the board

7'

oil feed hole

7''

pressure oil line

7'''

oil pump

8th

outer ring

a

axial direction

p

oil pressure

Claims (10)

Bearing arrangement (1), comprising two roller bearings (2), each with an inner ring (3) and an outer ring, and roller bodies (4) arranged between the bearing rings, the two roller bearings (2) being displaced by relative displacement of the inner rings (3) and/or the Outer rings can be preloaded in the axial direction (a) or provided with a desired bearing clearance, flanges (5) being arranged on the inner rings (3) and/or on the outer rings, which form an axial stop for the rolling elements (4), whereby at least one of the rims (5) is arranged on the bearing ring (4) so that it can be adjusted in the axial direction (a) relative to the bearing ring (3) that carries it, the adjustable rim (5) and the bearing ring (3) having a thread (6 ) are provided, so that the rim (5) can be adjusted relative to the bearing ring (3) by turning in the axial direction (a), and the adjustable rim (5) and the bearing ring (3) carrying it have means (7), with which the board (5) axially non-adjustable on La gerring (3), characterized in that the means (7) for axially fixing the rim on the bearing ring (3) comprise at least one oil feed bore (7') which is machined into the rim (5) and which is used to supply a Pressure fluid in the area of the gears (6 ', 6'') of the thread (6) is formed. bearing arrangement claim 1 , characterized in that the means (7) for axially fixing the flange on the bearing ring (3) further comprise at least one pressure oil line (7'') which is or can be connected to an oil pump (7'''). bearing arrangement claim 1 or 2 , characterized in that several oil feed bores (7') are provided, in particular 3 oil feed bores (7'). bearing arrangement claim 3 , characterized in that the oil supply bores (7') are arranged equidistantly around the circumference of the rim (5). Bearing arrangement according to one of Claims 1 until 4 , characterized in that the at least one oil feed hole (7') penetrates the rim (5) completely radially. Bearing arrangement according to one of Claims 1 until 5 , characterized in that sealing means are present with which the thread (6') in the bearing ring (3) is sealed against the thread (6") in the rim (5). bearing arrangement claim 6 , characterized in that the sealing means are formed by a conical thread (conical Whitworth pipe thread). bearing arrangement claim 6 , characterized in that the sealing means are formed by an armored pipe thread. Bearing arrangement according to one of Claims 1 until 8th , characterized in that the two roller bearings (2) are tapered roller bearings. Bearing arrangement according to one of Claims 1 until 9 , characterized in that the rims (5) are arranged on the inner rings (3).

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