DE102010046451A1 - Bearing i.e. radial-axial roller bearing, for bearing rotary table on machine frame of machine tool, has U-shaped cross-sectional inner ring including rough outer wall cooperating with clamping element - Google Patents

Abstract

The bearing (1) has a U-shaped cross-sectional inner ring (4) including a rough outer wall (27) i.e. particle-radiated surface, cooperating with a clamping element (3) e.g. clamping body freewheel. An outer ring (5) engages in the inner ring. A row of radial roller bodies (6) and two rows of axial roller bodies (7) are arranged between the rings. The clamping element is rotational fixedly connected with the outer ring and engages at a shaft disk that is rotational fixedly connected with the inner ring. The wall includes a roughness ranging from 0.5 micrometer to 1.2 micrometers and is greased. An independent claim is also included for a method for manufacturing a bearing with a braking and/or clamping device.

Description

Field of the invention

The invention relates to a bearing, in particular rolling bearing, which comprises a brake and / or clamping device.

Background of the invention

The present patent application is an additional application to DE patent application No. 10 2009 022 206.5-17 ,

From the DE 10 2005 056 282 B4 is a brake and / or clamping device for waves known. This device comprises a rotationally fixed to a shaft mounted brake disc and arranged in a device housing, cooperating with a frusto-conical friction region of the brake disc brake cone.

Another clamping and / or braking device is for example from the EP 1 651 881 B1 known. In this case, an element which can be acted upon by a pressure medium has a curved wall which deforms as the pressure prevailing in the medium changes in the manner of a toggle lever.

Object of the invention

The invention has for its object to provide a comparison with the prior art further developed, reliable operable and compact design, especially suitable for machine tools, arrangement of a bearing and a brake and / or clamping device, wherein an area on which the brake and / or clamping device acts, can be greased.

Summary of the invention

This object is achieved by a braking and / or clamping device comprehensive storage with the features of claim 1 and by a storage with the features of claim 2. Likewise, the object is achieved by a method having the features of claim 7 and by a Method with the features of claim 8. Embodiments and advantages explained in the following in connection with the method apply mutatis mutandis to the bearings and vice versa.

• – einen im Querschnitt U-förmigen ersten Lagerring,
• – einen in den U-förmigen Lagerring eingreifenden zweiten Lagerring,
• – eine Reihe zwischen den Lagerringen angeordneter Radialwälzkörper,
• – zwei Reihen zwischen den Lagerringen angeordneter Axialwälzkörper,
• – ein mit dem zweiten Lagerring drehfest verbundenes, direkt am ersten Lagerring angreifendes Klemmelement, wobei eine mit dem Klemmelement zusammenwirkende Oberfläche des ersten Lagerings aufgerauht ist.

The storage according to claim 1 comprises

• A cross-sectionally U-shaped first bearing ring,
• A second bearing ring engaging in the U-shaped bearing ring,
• A series of radial rolling elements arranged between the bearing rings,
• - two rows between the bearing rings arranged Axialwälzkörper,
• - A non-rotatably connected to the second bearing ring, acting directly on the first bearing ring clamping element, wherein a co-operating with the clamping element surface of the first bearing ring is roughened.

As a braking and / or clamping device is understood a device which is suitable both for braking, at least from very low speed, as well as for clamping a rotatable part. The device according to claim 1 or 2 comprises a cross-sectionally U-shaped first bearing ring and engaging in the U-shaped bearing ring second bearing ring, wherein it is preferably in the first bearing ring to an inner ring and the second bearing ring is an outer ring. Between the bearing rings, a number Radialwälzkörper, that is, the radial bearing serving rolling elements arranged. Next are between the bearing rings two rows Axialwälzkörper, that is, the axial bearing serving rolling elements arranged. Both in the radial rolling elements and in the Axialwälzkörpern are, for example, cylindrical rollers. According to the invention, a clamping element is connected directly or indirectly to the second bearing ring and provided for direct or indirect attack on the first bearing ring. In the latter case, a cooperating with the clamping element wave washer is rotatably connected to the first bearing ring.

The clamping element has a total preferably an annular shape adapted to the geometry of the bearing rings. Alternatively, a plurality of segment-like, preferably symmetrically distributed around the circumference of the bearing clamping elements may be provided. In extreme cases, especially in the case of only slightly required braking torques and clamping forces, a single clamping segment acting between the bearing rings can be sufficient.

In any case, a surface of the wave washer or of the first bearing ring, on which the clamping element engages, roughened, preferably particle-blasted. For particle blasting, colloquially referred to as sandblasting, for example, corundum or hard cast gravel is used. The particle-blasted surface preferably has a roughness of 0.5 μm to 1.2 μm Ra and 0.6 μm to 1.2 μm Rpk. Such a roughened surface is particularly well suited to cooperate with the clamping element both in the greased and in the non-greased state. Compared to a non-roughened surface whose roughness values were somewhat below the ranges of values stated above, was added otherwise identical test setup an increase of the transferred torque with activated clamping by about 50% measured.

Regardless of the configuration of the annular clamping element or of the at least one clamping segment, the first bearing ring is preferably made of a first, in cross-section L-shaped, running surfaces for both the radial rolling and for a series Axialwälzkörper providing bearing part and another, running surfaces exclusively for the second row Axialwälzkörper providing bearing part assembled. The clamping element preferably acts on the latter bearing part, wherein a force applied by the clamping element on this bearing part force preferably acts in the radial direction.

According to a first embodiment, the brake and / or clamping device of the storage operates fluid-actuated, that is, hydraulically or pneumatically. In this case, walls of the clamping element defining a pressure space form a pillow-shaped, flat structure, whereby, as the volume of fluid in the pillow increases, it does not only thicken, but at the same time contracts such that the distance between opposite narrow sides of the pillow becomes smaller. In order to achieve or remove the clamping, the thickening of the pad, but the change in the distance between the narrow sides is preferably not directly used. The walls of the clamping element act as force-transmitting elements in the manner of a toggle lever. In principle, this type of fluid-operated clamping, for example, from the above-mentioned EP 1 651 881 B1 as well as from the EP 1 585 616 B1 known.

According to a second embodiment, the clamping element of the bearing is designed as a switchable frictional freewheel, namely as a clamping roller freewheel or as a sprag freewheel. A sprag freewheel is understood to mean a freewheel which, in contrast to a sprag roller freewheel, does not work with circular cross-section but with a profile deviating from the circular shape, in particular with a tapered profile.

Several embodiments of the invention will be explained in more detail with reference to a drawing. Herein show:

Short description of the drawing

1 in a simplified sectional view of a first embodiment of a radial-axial roller bearing with a fluid-operated brake and / or clamping device;

2 in a representation analog 1 A second embodiment of a radial-axial roller bearing with a fluid-operated brake and / or clamping device,

3 a detail Z out 2 .

4 in a representation analog 1 and 2 an alternative design of a radial-axial roller bearing with a brake and / or clamping device,

5 the device after 4 in a further sectional view,

6 a first variant of the device according to 4 suitable clamping device, and

7 a second variant of the device according to 4 suitable clamping device.

Detailed description of the drawing

Corresponding or equivalent parts are indicated in all figures with the same reference numerals.

An in 1 in total with the reference times 1 marked storage is as a radial-axial roller bearing 2 with a clamping element 3 educated.

Parts of the radial-axial rolling bearing 2 are a cross-sectionally U-shaped inner ring 4 and one in the U-profile of the inner ring 4 engaging second bearing ring, namely outer ring 5 , being between the bearing rings 4 . 5 a series of radial rolling elements 6 and two rows Axialwälzkörper 7 roll. The design of the radial-axial rolling bearing 2 is in principle for example from the DE 196 40 895 B4 known. In the manner not shown, the radial-axial roller bearing 2 as well as from the DE 196 40 895 B4 have known storage an integrated speed measuring device.

Warehousing 1 is in an only hinted machine tool 8th installed and used for storage of a turntable 9 on a machine frame 10 , where the inner ring 4 with the turntable 9 and the outer ring 5 with the machine frame 10 is screwed. The inner ring 4 is composed of a first, in cross-section L-shaped bearing part 11 and a second, rectangular in cross section bearing part 12 , A number each by both bearing parts 11 . 12 inserted screws 13 is for fixing the inner ring 4 on the turntable 9 intended. The bearing parts 11 . 12 lie on a cylinder jacket-shaped wall 14 of the turntable 9 at. The bearing part 12 is in addition to one annular surface 15 the turntable, which in a to the axis of rotation A of the storage 1 normal level and is thus relative to the turntable 9 exactly centered. The outer ring 5 contacted in the radial and axial direction an inner wall 16 or an annular surface 17 of the machine frame 10 on which he uses screws 18 is attached. The screws 18 are just like the screws 13 arranged parallel to the axis A. On three surfaces of the outer ring 5 are treads 19 for the rolling elements 6 . 7 educated. At the same time, the rolling elements roll 6 . 7 on treads 20 . 21 the bearing parts 11 . 12 from.

In addition to the outer ring 5 is on the machine frame 10 the clamping element 3 attached, which also has an annular shape. The clamping element 3 is in the same axial space as the bearing part 12 of the inner ring 4 arranged. A fluid actuated actuator 22 of the clamping element 3 is in the illustrated cross section pillow or lenticular, with an interior 23 of the actor 22 through flexible walls 24 is limited. The walls 24 are arranged substantially in a plane normal to the axis of rotation A. An actuator ring 25 of the clamping element 3 closes radially inside to the interior 23 of the actor 22 and describes a cylinder jacket-shaped contact surface 26 leading to the outer wall 27 of the storage part 12 is parallel. To the storage 1 to clamp, that is the inner ring 4 relative to the outer ring 5 To fix, is by fluid-operated deformation of the interior 3 the contact surface 26 directly to the outer wall 27 of the inner ring 4 pressed. The outer wall 27 is roughened by particle beams, wherein as blasting medium, for example, white corundum, type EKF 220, or hard cast gravel GH-KG 02 is used. The brake and / or clamping device of storage 1 is thus both compact and in the greased and in the non-greased state of the outer wall 27 of the inner ring 4 precisely effective. The outer wall 27 has roughness values of 0.8 μm Ra and 1.0 μm Rpk.

The embodiment according to 2 differs from the embodiment according to 1 essentially in that the clamping element 3 not directly on the inner ring 4 but at a separate, non-rotatable with the inner ring 4 connected wave washer 36 attacks. Analogous to the inner ring 4 In the first embodiment, in this case, the wave washer 36 a roughened outer wall 27 on. Although with the clamping element 3 cooperating surface, namely the outer wall 27 , not by a bearing ring, but by another component, namely the wave washer 36 , is due to the rough, generated by particle radiation surface structure of the outer wall 27 given a very good braking and clamping effect, which also in this case a compact construction of the storage 1 is feasible. The design of the outer wall 27 the wave washer 36 corresponds to the configuration of the outer wall 27 of the inner ring 4 in the exemplary embodiment 1 ,

In the embodiment of the 3 and 4 Instead of a fluid-operated clamping element is formed in the manner of a switchable freewheel clamping element 3 used. Also in this case, the clamping element engages 3 directly on the inner ring 4 at. Here contact clamping parts 28 on the one hand, at least indirectly, the outer ring 5 and on the other hand directly the outer wall 27 of the inner ring 4 , In the design according to the 3 . 4 are as clamping parts 28 clamping rollers 29 intended. Details of this design are in 5 recognizable. After that are on the outer ring 5 or a component connected to this clamping ramps 30 formed while the outer wall 27 of the inner ring 4 is completely cylindrical. The pinch rollers 29 are through a cage 31 guided and individually by springs 32 sprung. The circuit of the clamping element 3 takes place by a switching element, not shown, with the example of the geometry of an outer ring 5 held, the clamping ramps 30 forming sleeve 33 is changeable. Here are several such sleeves 33 or other, clamping ramps 30 be exhibiting components braced against each other. To the designed as a freewheel clamping element 3 to switch, the sleeve can 33 slotted. With regard to the basic structure of a working with pinch rollers in the manner of a roller freewheeling clutch is exemplified in the EP 1 038 117 B1 referring to a fully complementary, multidirectional coupling.

The operation, that is, the loosening or fixing of the clamping element 3 , For example, can be pneumatic or electromechanical. This also applies to the modified design of the clamping element 3 to 6 in which as clamping elements 28 waisted clamp body 34 be used. Unlike the pinch rollers 29 according to the variant 5 are the clamp bodies 34 not individually, but by a single spring band 35 sprung.

In each embodiment according to the 1 to 6 the clamping force in the radial direction is symmetrical on the turntable 9 applied. This is any change in the position of the turntable 9 excluded by the clamping due to the principle. In all cases, the clamping element 3 either be designed so that by energy supply storage 1 is fixed, or such that by supplying energy, such as electric power, compressed air or hydraulic oil, the clamping of the storage 1 will be annulled.

LIST OF REFERENCE NUMBERS

1

storage

2

Radial-axial roller bearing

3

clamping element

4

inner ring

5

outer ring

6

Radialwälzkörper

7

Axialwälzkörper

8th

machine tool

9

turntable

10

machine frame

11

first bearing part

12

second bearing part

13

screw

14

wall

15

surface

16

inner wall

17

surface

18

screw

19

tread

20

tread

21

tread

22

actuator

23

inner space

24

wall

25

Aktorring

26

contact area

27

outer wall

28

clamping part

29

pinch roller

30

clamping ramp

31

Cage

32

feather

33

shell

34

clamping bodies

35

spring band

36

wave washer

A

axis of rotation

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 102009022206 [0002]
• DE 102005056282 B4 [0003]
• EP 1651881 B1 [0004, 0012]
• EP 1585616 B1 [0012]
• DE 19640895 B4 [0024, 0024]
• EP 1038117 B1 [0028]

Claims (12)

Bearing according to claim 1 of the patent application DE 10 2009 022 206.5-17 , characterized in that the first bearing ring ( 5 ) one with the clamping element ( 3 ) cooperating, roughened outer wall ( 27 ) having. Bearing with a brake and / or clamping device, comprising - a U-shaped in cross-section first bearing ring ( 4 ), - one in the U-shaped bearing ring ( 4 ) engaging second bearing ring ( 5 ), - a row between the bearing rings ( 4 . 5 ) arranged radial rolling bodies ( 6 ), - two rows between the bearing rings ( 4 . 5 ) arranged Axialwälzkörper ( 7 ), - one with the second bearing rings ( 5 ) rotatably connected clamping element ( 3 ), which at one with the first bearing ring ( 4 ) rotatably connected wave washer ( 36 ), one for cooperation with the clamping element ( 3 ) provided roughened outer wall ( 27 ) having. Bearing according to claim 1 or 2, characterized in that the outer wall ( 27 ) is formed as a particle-blasted surface. Bearing according to one of claims 1 to 3, characterized in that the outer wall ( 27 ) has a roughness Ra of at least 0.5 μm and at most 1.2 μm. Bearing according to one of claims 1 to 4, characterized in that the outer wall ( 27 ) has a roughness Rpk of at least 0.6 μm and at most 1.2 μm. Bearing according to one of claims 1 to 5, characterized in that the outer wall ( 27 ) is greased. Method for producing a bearing with a brake and / or clamping device, comprising the following steps: - providing a bearing ( 1 ), which - a U-shaped in cross-section first bearing ring ( 4 ), - one in the U-shaped bearing ring ( 4 ) engaging second bearing ring ( 5 ), - a row between the bearing rings ( 4 . 5 ) arranged radial rolling bodies ( 6 ), - two rows between the bearing rings ( 4 . 5 ) arranged Axialwälzkörper ( 7 ), wherein an outer wall ( 27 ) of the first bearing ring ( 4 ) is roughened by particle beams, - fixing a clamping element ( 3 ) on the second bearing ring ( 5 ) such that this directly on the roughened outer wall ( 27 ) of the first bearing ring ( 4 ) attacks. Method for producing a bearing with a braking and / or clamping device, comprising the following steps: - providing a bearing ( 1 ), which - a U-shaped in cross-section first bearing ring ( 4 ), - one in the U-shaped bearing ring ( 4 ) engaging second bearing ring ( 5 ), - a row between the bearing rings ( 4 . 5 ) arranged radial rolling bodies ( 6 ), - two rows between the bearing rings ( 4 . 5 ) arranged Axialwälzkörper ( 7 ), - spreading of a wave washer ( 36 ) which has an outer wall roughened by particle radiation (US Pat. 27 ), - producing a non-rotatable connection between the wave washer ( 36 ) and the first bearing ring ( 4 ), - fixing a clamping element ( 3 ) on the second bearing ring ( 5 ) such that this at the roughened outer wall ( 27 ) of the wave washer ( 36 ) attacks. A method according to claim 7 or 8, characterized in that the particle blasting is done with fine corundum. A method according to claim 7 or 8, characterized in that the particle beam takes place with chilled gravel. Method according to one of claims 7 to 10, characterized in that by the particle blasting a roughness of the outer wall ( 27 ) is generated from 0.5 μm to 1.2 μm Ra and 0.6 μm to 1.2 μm Rpk. Method according to one of claims 7 to 11, characterized in that the outer wall ( 27 ) is greased.

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