DE102005060440A1 - Brake disk pot for heavy duty brake system with radial expansion e.g. for motor vehicle, has brake disk pot which is divided in two thermal ranges, whereby outer pot ring is thermally separated from inner pot ring - Google Patents

Abstract

Brake disk pot has brake disk pot (2) which is divided in two thermal ranges separated from each other and a outer pot ring (5), which is thermally separate from the inner pot ring (6). Thermal expansion able element is arranged in the gap between the inner and the outer pot ring, which has a radial expansion of the outer pot ring referring to the inner pot ring.

Description

object The invention is a brake disk hub of a high-performance brake system with radial expansion according to the preamble of claim 1.

High-performance brake systems be especially for High quality sports cars are usually used as and Brake disc a ceramic disc, which has a screw connection with the brake disc pot is connected.

Such a screw connection is, for example, the subject of the same applicant DE 202 21 132 U1 , The local disclosure is fully incorporated by reference.

The However, the present invention does not only relate to ceramic brake discs, but also on metallic brake discs and brake discs, consisting of composite materials suitable for high performance brake systems are suitable.

at High-performance brake systems have the problem that the brake disc ring heated to red hot and thus has a considerable thermal expansion clearance.

The mastery of this thermal expansion game was the subject of the older document DE 202 21 132 U1 ,

Now the problem was recognized that in the heat transfer of the highly heated Brake disc ring on the pot the pot itself high heat loads is exposed, which may lead to undesirable deformation. In the area of its screw connection with the brake disc ring he has usually a temperature between 600 to 800 degrees while he is only has a temperature of about 100 degrees in the hub area.

It was not possible until now this considerable Temperature differences in the pot and the associated heat distortion sufficient to master.

The mentioned temperature differences lead to a delay of the pot, because the outer area the pot stronger expands as the inner area. Therefore, there is an undesirable heat distortion, which warps the pot in the sense of a ripple and to a plan impact leads, on the outside flanged brake disc ring is transmitted. This leads to a "rubbing" of the brake disc ring. It is the so-called "warm scrubbing".

Thereby the ride comfort is impaired, the Wear of the Brake disc ring increased and the pot can even withstand the high temperatures permanently deform, resulting in the uselessness of the brake system leads.

Of the undesirable Delay of the pot can lead to an undesirable crowning (bulging) of the pot lead overall what an inadmissible Slip of the brake disc ring leads and the brake unusable power.

Of the The invention is therefore the object of the high-performance brake systems in the pot resulting thermal stresses to dominate so that there is no undue deformation of the pot when exposed to high temperatures from the side of the brake disc ring comes to the pot.

to solution the task is the invention by the technical teaching of claim 1.

Essential in the present invention is that the brake disk cup in dividing two separate thermal areas, in an outer pot ring, which is thermally separated from the inner pot ring and hereby arranged in the space between the inner and outer pot ring thermo-expandable elements which are related to a radial extent of the outer cup ring with respect to have the inner pot ring.

The said formation of separate thermal areas is only in the ideal case given. In reality, they are expansion elements which a radial extent of the outer pot ring with respect to take over the inner pot ring and which allow a certain amount of expansion play, wherein in a preferred Embodiment this Expansion elements in one piece from the pot of the material are formed.

It So is a middle ring area between two interconnected Topfrings (outer and inner pot ring), and this middle ring area becomes by thermally expansive Elements realized.

In order to There is the advantage that even at high temperatures and temperature differences within the brake disc hub a clean axial run of the brake disc ring guaranteed is.

The invention relates to all brake discs, both those which consist of one piece even those that consist of several parts.

The said thermal expansion elements consist in a preferred embodiment of webs consisting of the material worked out of the brake disc hub of the middle ring area are.

Such Stages can produced by various manufacturing processes.

In a first embodiment, it is provided that these webs through a wire EDM machine are made.

Of course, such Footbridges - the through surrounding breakthroughs are defined - too be prepared by other methods, such. By laser cutting, by milling, by drilling and non-cutting shaping.

Important is that the webs with corresponding adjacent breakthroughs in the Alternate middle ring area, so as to have a radially expansible, middle To create ring area in the pot.

In A preferred embodiment of the invention is intended that these webs are always sloping are formed to the circumferential line to a thermal Expansion game for to ensure these bars. Furthermore the embodiment relates Make sure the webs are level with the level of the top ring are. However, the invention is not limited thereto.

In a further development is provided that the webs from the Buckle out the top of the pan ring, So are three-dimensional deformed.

Such Stages can as on the circumference circumferential, out of the plane of the pan rings out arched ring bead be educated. The annular bead thus forms a single, circumferential jetty.

In However, a development of the invention, the annular bead but also by evenly on the circumference distributed breakthroughs be divided, which then turn out of the level of the pot rings domed Webs forms. The longitudinal axis of this breakthroughs can be in the direction of a radius jet or at an angle to the radius jet be formed inclined.

So far the proposed webs refer to an embodiment, in the webs are aligned in a plane to the level of the pot ring, it is preferred if their longitudinal axes at an angle to the circumferential line and therefore also at an angle to one of centrally inside out directed radius beam are arranged.

These oblique, disassembled arrangement has the advantage that the webs the required thermal expansion clearance and a delay of the pot can no longer take place.

Becomes now, for example, the defined by the invention outer pot ring to a temperature in the range of, for example, 300 to 700 degrees heated due to a braking process, this high temperature only delayed and in much less heat transfer over the said webs transmitted to the radially inwardly directed inner pot ring.

To the one are the webs yes by adjacent breakthroughs in the pot defines what causes that There is a significant ventilation through the breakthroughs takes place and thus a strong cooling takes place.

Further are the webs compared to through cross sections in this reduced middle ring area in their cross section - because they through adjacent breakthroughs are defined - and Due to these reduced cross sections also the heat transfer takes place to a lesser extent.

by virtue of the fact that the webs always arranged arcuately or obliquely are also results in comparison to one on a radius beam sitting bridge an enlarged heat transfer route from radially outside radially inward, which also leads to a delayed heat transfer. The temperature-induced growth in length the bridges leads no longer an unwanted bulge of the entire pot ring, but only to a slight twist between the inner and outer pot ring.

In order to There is the advantage that the inner part of the pot no is exposed to high temperature loads and that in the pot protruding hub only slightly heated will, what for the ball bearings arranged there and the lubrication extraordinarily it is gentle.

It So there is a very good in the defined middle ring area cooling effect through air and a wanted thermal expansion said webs, so that it is no longer the unwanted delay or the bulge the pot comes at temperature load on the outer pot ring.

In a further development of the present invention, it is provided that the heat-expandable region is formed as a circumferential annular bead, which is directed either in the axial direction outwards or in the axial direction inwards is.

This circumferential annular bead can be made by different manufacturing methods be won. In a first embodiment it is provided that this annular bead achieved by unscrewing the inner pot ring becomes what a machining requires.

In a second embodiment It can be provided that this annular bead by pulling, pressing, beading or any other cold or hot working is achieved.

It is self-evident provided that the torus also seen through its circumference radially outward directed recesses may be interrupted so that between the recesses radially outward directed webs result, which in the manner described above as annular bead are deformed.

These Stages can either directed straight (or at an angle) outwards, that is about spoke-like be; you can but also conically widening, curved or formed in another way be.

As well it can be provided that in the axial direction through the annular bead one or more holes go through, evenly around the circumference of the inner pot ring are arranged.

Further Can be combined or in isolation with the previously mentioned Holes also be provided that in the radial direction of the annular bead passing through holes are provided, it being provided can that for drilling only the upper or the lower wall penetrated by the annular bead or even aligned holes available which are both the upper and the lower wall of the annular bead push through.

For the rest, the Holes are not aligned, but they can also with respect to the upper and lower wall offset from each other.

The Invention is not, however, to the formation of a torus limited with the above properties, with the torus facing outward is. It is also provided that the torus is directed inward is or that several ring beads are arranged one behind the other in the radial direction.

As well it can be provided that material-weakening and thus expansion-promoting annular grooves are provided, which limit the annular bead above and below, so as to allow the bendability of the annular bead.

The Arrangement of a curved out of the plane of the two pan rings out annular bead has the advantage that a large heat-dissipating through this annular bead area is created, the instructional capacity still through the previously described Breakthroughs, ribs and / or holes can be improved.

Further there is the advantage that a heat-related linear growth takes place in both the radial and in the axial direction, which Total length growth reduced in the radial direction. The thus formed, three-dimensional Deformation zone (in the form of one or more annular beads) provides for one absolute parallelism the levels of inner and outer pot ring, and thus to an absolutely temperature-independent axial runout of the brake ring and the pot.

In A further embodiment of the invention provides that the heat-expandable elements formed as a toothing, between the inner and the outer pot ring is arranged.

It is a circumferential on the circumference toothing, which is a radial Expansion play between the inner and outer pot ring allows.

such Gears are in various embodiments realizable.

It come here splined or even simple Lappenverzahnungen in question, in which corresponding lobes are assigned to a part in gleichgeformte recesses in the other part and so intervene positive Allow circumferential engagement, however, allow a radial play.

For this Type of gearing there are a variety of ways that the expert are known.

to Realization of this interlocking, it is necessary to have an internal and outer support ring in the area To install the gearing, to ensure that the gearing not in the axial direction except Intervention comes. These support rings, the outside and support each inside the teeth, therefore, only allow a radial play of the teeth, but a play-free fit and entrainment in the circumferential direction.

Instead of the previously described face gears with lobes, so-called Hirth gears or keyways can also be used be used.

The Screwing this gearing is resiliently biased to also in this way, a radial expansion clearance and a backlash-free bias to allow in the circumferential direction.

In In a final embodiment of the invention, it is provided that the inner pot ring with radially outward and evenly distributed on the circumference equipped rag equipped is that in their upper, free ends the associated slots for recording allow the brake disk ring.

in the Area of this oblong-shaped Recesses is a radial game possible, so that in turn heat transfer from the inner colder Top ring on the outer hot pot ring through the spoke-shaped Training the lobe is difficult.

The Rags are in fact characterized in that they have relatively large recesses between them form, reducing the heat transfer from the outer, hot brake disk ring over the outer pot ring on the inner pot ring is difficult. In addition, this results excellent ventilation.

Of the Subject of the present invention does not arise only from the subject matter of the individual claims, but also from the combination the individual claims among themselves.

All in the documents, including Summary of information and features, in particular the spatial training shown in the drawings as claimed essential to the invention, as far as they individually or in Combination opposite the prior art are new.

in the Below, the invention will be described with reference to only one embodiment illustrative drawings closer explained. Here are more from the drawings and their description Essential to the invention features and advantages of the invention.

It demonstrate:

1 : Partial section through a high-performance brake system;

2 : Top view of the pot in a first embodiment;

2a a detail of a web in the embodiment according to 2 ;

2 B : one opposite 2a modified second embodiment;

2c : one opposite 2a and 2 B modified third embodiment;

2d : the thermal expansion play of a bridge after the 2 and 2a ;

3 : The top view of a second embodiment of a pot;

4 a detailed representation of a third embodiment of a pot with approximately circular or arcuate laid webs;

5 : Top view of a pot in another embodiment with a circumferential annular bead

6 : Cut through the arrangement after 5

6A Schematic representation of the thermal expansion of the annular bead

7 : the top view on one opposite 5 modified embodiment with representation of different webs

8th : one opposite 6 modified embodiment

9 : one opposite the 6 and 8th another modified embodiment

10 a further embodiment in a modification of 9

11 : An embodiment in section with representation of a radial toothing

12 : the front view of the arrangement after 11

13 A further embodiment of a radially acting toothing in section

14 a further embodiment of a heat-expandable connection between the inner and outer pot ring

15 : the front view of the arrangement after 14

The 1 shows a brake disc ring; which originated in the region of this brake disc ring high temperatures are in the area of the screw connection 4 on the outer area of the pot 2 transfer.

This outer area is an outer pot ring 5 shown, and this has a tendency to move in the radial direction in the arrow direction 7 expand.

However, because of the pot 2 in the inner area (inner pot ring 6 ) of the hub and rim remains relatively cold, the pot has 2 the tendency to distort, which has a negative effect on the braking behavior.

This is where the invention comes in by providing a novel form of heat transfer and thermal separation from the outer pot ring 5 to the inner pot ring 6 is proposed. This ensures that the hot area (outer pot ring 5 ) in the direction of the arrow 7 can expand without the rash 11 the brake disc ring 1 is impaired.

In known manner, the pot 2 still mounting holes 3 for the rim on and has moreover a middle breakthrough for reaching through the hub.

In the first embodiment according to 2 is thus the pot 2 in two separate ring areas 5 and 6 divided, by a middle ring area 22 made of a variety of uniform, approximately s-shaped webs 9 is defined.

The bridges 9 are made of the material of the pot in the middle ring area 22 by the attachment of appropriate breakthroughs 10 worked out.

So there is a material-integral connection with the material of the pot both in the outer pot ring 5 as well as in the inner pot ring 6 ,

In the absence of these bars 9 was found that - with inadmissibly high thermal expansion - and the slots 12 for the screw connection 4 constricted, causing the expansion clearance of the brake disc ring in the area of the screw 4 was impaired.

The brake disk ring then tended to jam because of the narrowing slot 12 , Thus, an inadmissibly high plan impact was 11 given.

This is avoided with the present invention because of the delayed heat transfer and the additional cooling in the middle ring area 22 it can no longer happen that the slots 12 inadmissibly narrow.

With the measures according to the invention it is ensured that the outer pot ring 5 expand in the radial direction, causing an impermissible narrowing of the slots 12 prevented.

A first embodiment of a web 9 is fragmentary in 2a shown.

Each bar is equipped with a radially outer bar approach 13 Material integral with the outer pot ring 5 connected and consists of an approximately straight at the perimeter 17 of the outer pot ring 5 starting approach 13 which is in an approximately circumferentially aligned central web approach 14 which, for its part, turns into a radial web shoulder lying on a radius line 15 passes.

This results in an S-shape of the web 9 Overall, it is clear that the approaches 13 . 15 on a sloping line 18 lie, which is an angle 16 towards the perimeter 17 forms.

Thus a sufficient thermal expansion play is produced, as it is based on the 2d is shown in more detail.

It can be seen that the approach 15 that attaches to the colder, inner pot ring 6 connects, remains practically fixed and that only the outer areas of the bridge 9 in the indicated direction of the arrow in the form of the web approaches 14 ' and 15 ' deform and thereby the desired play in the radial direction (arrow 21 ) for the outer pot ring 5 enable.

The 2 B and 2c show modified embodiments, from which it can be seen that it is a "lying" S for the web 9a or even a straight, but diagonally directed bridge 9b ,

The 4 shows, moreover, that also arched bars 9c can be provided by different sized breakthroughs 10 in the middle ring area 22 getting produced.

The 3 shows as a further embodiment approximately straight webs 9b as they are in 2c are shown.

These ridges are made by slanted slots 19 formed, which in larger recesses 20 in the middle ring area 22 pass.

The pot material in the middle ring area 22 is thus through this line 19 and the subsequent recesses 20 interspersed.

This results in turn material integral to the inner and outer pot ring 5 . 6 subsequent sloping footbridges 9b , which also the required expansion clearance for the outer pot ring 5 to reach.

Of course, the webs formed from it 9b not straight, but they can also be curved slightly arcuate.

Important in all embodiments is that the pot in a cold area (namely in an inner pot ring 6 with hub and rim separated by an outer, hot area (outer pot ring 5 ) and the hot area in the direction of the arrow 7 can expand without the rip of the brake disc ring 1 is impaired.

The Webs are designed to match the two temperature ranges elastically interconnects.

It So is concerned with temperature-conditionally resilient webs, a corresponding Allow temperature expansion, but when the temperature load decreases get back to their original ones State back deform.

Already in the general description has already been noted that through the additional arrangement of the breakthroughs 10 an additional ventilation effect and an even better thermal separation between the cup rings 5 . 6 he follows.

It was also noted that due to the s-shaped or the oblique arrangement of the webs 9 an enlarged heat transfer path with reduced heat transfer takes place because the webs the material cross-section in the middle ring area 22 limit.

This results in a better cooling for the outer pot ring 5 ,

At the same time a significant weight saving is ensured for the pot through the openings, and the webs should be about the material width of the outer and inner pot ring 5 . 6 have to allow for a certain lateral stability.

So they are in their material thickness about the material thickness of the outer and inner pot ring 5 . 6 customized.

The embodiments described above all refer to the fact that the central, heat-expansible region with the webs described is in a plane with the outer and inner pot rings. However, the invention is not limited thereto. It is provided in a further embodiment that this central, heat-expandable region bulges out of the plane of the two aligned cup rings. It is therefore a three-dimensionally deformed heat-expandable area. All previously described and all embodiments described below thus also relate to such an extended version. As an example of such an embodiment are hereinafter the 5 and 6 , such as 6a described in more detail.

In 5 and 6 It is shown that the heat-expansible elements specified in claim 1 also as annular bead 23 may be formed, the z. B. by unscrewing the inner pot ring 6 can be achieved.

This circumferential ring bead is in 5 shown, and there is an excellent thermal expansion, because due to the heat transfer in the annular bead 23 the bent lobe expands in the area of the annular bead and neither leads to a loss of the axial run nor to a change in the plan waviness.

The 6A schematically shows the thermal expansion of the outer pot ring 5 in the area of the annular bead 23 , It is essential that the through the brake disc ring 1 registered heat only the outer pot ring 5 loaded, which expands radially according to the dashed lines, wherein the upper leg of the annular bead also slightly radially expands and bends. Important here, however, is that the parallelism of the outer pot ring 5 is maintained absolutely with the vertical upward leg and the runout is affected by the thermal expansion in any way. This is a significant advantage over the prior art.

In the illustration after 6 is still shown that optionally through the annular bead axial holes 33 can be arranged distributed uniformly around the circumference or radially directed holes 32 ,

It may also be provided that at the radial bores 32 the one bore through the upper wall offset from the bore through the lower wall of the annular bead 23 is arranged.

These Drilling can also different sizes or be formed in different forms.

The 7 shows that the torus 23 also through the aforementioned breakthroughs 10 under may be broken, which are either designed as a spoke-shaped straight breakthroughs or can also take S-shape or even one or more holes 33 can carry.

In between, this results in radial web approaches 13 in the ring bulge 23 that have excellent thermal expansion.

Through the intended breakthroughs 10 or the holes 32 . 33 good ventilation is achieved.

In 8th is compared to 6 shown that to improve the bendability of the annular bead 23 in the radial direction cross-section weakening annular grooves 31 above and below the annular bead 23 are arranged so as to weaken the material in this area and to improve the flexibility.

The 9 shows that instead of a torus 23 also two oppositely directed ring beads 23 . 34 may be provided, these annular beads in turn by corresponding annular grooves 31 are separated from each other.

The invention is of course not on the one behind the other in the radial direction arrangement of two (oppositely directed) annular beads 23 . 34 limited. It can also be provided more than two.

Likewise, it is not necessary, the ring grooves shown here 31 to achieve by machining. The ring bulbs 23 . 34 can also be achieved by cold or hot forming.

In 10 is shown that the torus 23 may also be directed inward towards the axis. This is in contrast to the embodiment according to 6 where he is abroad.

The 11 and 12 show another way of radial expansion over heat-expandable elements. These heat-expandable elements are here by toothing elements of a toothing 27 shown.

The gearing 27 consists here, for example, by radially inwardly directed lobes 35 on the outer pot ring, which are arranged distributed uniformly around the circumference and in associated, radially outwardly open shots of the toothing 27 intervene in the inner pot ring. Thus, a radial expansion clearance is given, however, ensures a positive engagement in the circumferential direction.

The entire toothing is in the axial direction by inside and outside support rings 24 . 25 supported by means of one screw each 26 are held together.

Instead of the screw 26 can of course also another connecting means, such. As a rivet and the like can be used.

in the General description part has already been noted that instead of the lobe-shaped toothing shown here, other (radial expandable) Gear forms can be applied.

The 13 shows as a further embodiment, the use of a so-called Hirth toothing 37 , which is also shown as a keyway.

Here, the outer pot ring 5 Evenly distributed around the circumference arranged holes, which have an inwardly facing toothing, in an associated toothed collar screw 30 engages, with the collar screw 30 with its threaded bolt in an associated threaded hole 36 on the inner pot ring 6 intervenes.

The Hirth toothing shown here is still using a spring element 29 resiliently biased in the axial direction and thus allows a radial expansion clearance between the inner and the outer pot ring.

Instead of the spring loaded screwed collar screw 30 Also, a non-spring-loaded screw can be used instead of the threaded hole 36 also a screw-nut connection. Likewise, the collar screw 30 be replaced by a rivet. It is also possible to use the head of the collar screw 30 to arrange outside and not inside, as in 13 is shown.

The head of the collar screw 30 is with a pressure washer 28 opposite the gearing 37 supported.

in the Principle can between the inner and outer pot ring all known, rigid couplings are used, which is a thermal expansion clearance in the radial direction, however, a form-fitting Ensure driving in the circumferential direction. In addition to the previously mentioned Plank serration can Therefore, other rigid couplings are used.

In 14 and 15 is another example of a heat-expandable element shown in the embodiment shown from individual lobes evenly distributed around the circumference 38 that is the inner pot ring 6 form.

The lobes are by relatively large recesses 39 formed and carry at their outer area the respective slot 12 , which is a radial expansion clearance with respect to the brake disc ring 1 allows.

In this area of the long hole 12 So there is the radial expansion clearance between the inner and the outer pot ring. Inner and outer pot ring 5 . 6 Here are a part, because the radial expansion clearance in the region of the slot 12 of the outer pot ring 5 he follows.

This is a better cooling total of the brake disc hub 2 possible because of the large recesses 39 large-area cooling cross sections are present and the lobes 38 allow the said expansion game.

In 14 is still shown that the recesses 39 with their reason 40 down to the vicinity of the mounting hole 3 for the pot 2 can extend.

The said radial expansion clearance results from an earlier application the same applicant, the entire disclosure of which is covered by the Disclosure of the present invention.

1

brake disk ring

2

pot

3

mounting hole

4

screw

5

outer pot ring

6

internal pot ring

7

arrow

8th

detail section

9

web 9a . 9b . 9c

10

breakthrough

11

wobble

12

Long hole

13

radial web shoulder

14

middle bridge approach 14 '

15

radial web attachment 15 '

16

angle

17

peripheral line

18

Just

19

slot

20

recess

21

arrow

22

middle ring area

23

torus

24

support ring 1

25

support ring 2

26

Screw / rivet circulating

27

gearing circulating

28

thrust washer

29

spring element

30

Screw / shoulder screw

31

ring groove

32

radial drilling

33

axial drilling

34

torus

35

cloth

36

threaded hole

37

Hirth coupling (or keyway)

38

cloth

39

recess

40

Reason (recess 39 )

Claims (19)

Brake disk pot of a high-performance brake system with radial expansion, in particular for motor vehicles, with a brake disk ring ( 1 ) and a compensation of different temperature expansions associated brake disk pot ( 2 ), wherein on the circumference of the brake disc ring ( 1 ) distributed recesses are provided, and the brake disk pot end of a bolt by a respective recess in the brake disk chamber ( 2 ) engages and on this end a clamping disc under the spring load of a force accumulator the brake disc hub ( 2 ) against the brake disc ring ( 1 ) biases resiliently in the axial direction, wherein in each case a bolt of the brake disk ring ( 1 ) is clamped and the brake disc pot end of the bolt by a respective radially outwardly directed slot ( 12 ) in the brake disk pot ( 2 ) engages, characterized in that the brake disk pot ( 2 ) is subdivided into two separate thermal regions, namely into an outer pot ring ( 5 ) which is thermally separated from the inner pot ring ( 6 ) and in the space between the inner and outer pot ring ( 5 . 6 ) heat-expandable elements ( 9 . 13 - 15 . 22 . 23 . 27 . 37 . 38 . 39 ) are arranged, which a radial extension of the outer pot ring ( 5 ) in relation to the inner pot ring ( 6 ) exhibit. Brake disc cup according to claim 1, characterized in that the thermal regions comprise heat-expandable elements which allow a radial extension of the outer cup ring (10). 5 ) in relation to the inner pot ring ( 6 ) and which allow a certain expansion play, these expansion elements materialeinstückig from the pot ( 2 ) of the material are formed. Brake disc cup according to claims 1 to 2, characterized in that the brake discs material integral or from several Tei len formed formed. Brake disc cup according to claims 1 to 3, characterized in that the heat-expansible elements as webs ( 9 . 9a . 9b . 9c ) are formed and with a radially outer web approach ( 13 ) material integral with the outer pot ring ( 5 ) are connected and from one approximately straight at the peripheral line ( 17 ) of the outer pot ring ( 5 ) approach ( 13 ), which in an approximately circumferentially aligned central web approach ( 14 . 14 ' ), which in its turn turns into a radial ridge extension lying on a radius line ( 15 . 15 ' ), whereby the webs ( 9 . 9a . 9b . 9c ) from the material of the middle ring area ( 22 ) from the brake disk pot ( 2 ) are worked out. Disc brake disc according to claims 1 to 4, characterized in that the webs ( 9a . 9b . 9c ) surrounding breakthroughs ( 10 ) and / or recesses ( 20 ), which with adjacent breakthroughs ( 10 ) and / or recesses ( 20 ) in the middle ring area ( 22 ) alternate. Disc brake disc according to claims 1 to 5, characterized in that the webs ( 9 . 9a . 9b . 9c ) are formed obliquely to the circumferential radius line and have a thermal expansion clearance. Brake disc cup according to claims 1 to 6, characterized in that the webs ( 9 . 9a . 9b . 9c ) at an angle to the peripheral line ( 17 ) are formed and are arranged to a centrally directed radially outward radius jet and have the required thermal expansion clearance and a delay of the pot ( 2 ). Brake disc chamber according to claims 1 to 7, characterized in that the temperature of the heated due to a braking operation outer pot ring ( 5 ) delayed and in much lower heat transfer via the webs ( 9 . 9a . 9b . 9c ) on the radially inwardly directed inner pot ring ( 6 ) is transmitted. Brake disc chamber according to claims 1 to 8, characterized in that the adjacent openings ( 10 ) in the middle ring area ( 22 ) of the brake disc ring ( 1 ) form a substantial ventilation with subsequent delayed and substantially lower heat transfer. Brake disc chamber according to claims 1 to 9, characterized in that the webs ( 9 . 9a . 9b . 9c ) in the middle ring area ( 22 ) a reduced cross-section by means of the adjacent defined breakthroughs ( 10 ) exhibit. Brake disc cup according to claims 1 to 11, characterized in that the arcuate or obliquely arranged webs ( 9 . 9a . 9b . 9c ) have an enlarged heat transfer path and the inner part of the pot ( 2 ) and in the pot ( 2 ) projecting hub with the ball bearings arranged there and lubrication have a reduced heating. Brake disc cup according to one of claims 1 to 11, characterized in that the heat-expansible element of at least one annular bead ( 23 . 34 ) is formed, ( 6 - 10 ). Brake disc cup according to one of claims 1 to 12, characterized in that the annular bead ( 23 . 34 ) by axial and / or radial bores ( 32 . 33 ) is interspersed. Brake disc cup according to one of claims 1 to 13, characterized in that the annular bead ( 23 . 34 ) with breakthroughs ( 10 ) is interspersed. Brake disc cup according to one of claims 1 to 14, characterized in that to improve the bendability of the annular bead ( 23 . 34 ) in the radial direction cross-section-weakening annular grooves ( 31 ) above and / or below the annular bead ( 23 . 34 ) are arranged. Brake disc cup according to one of claims 1 to 15, characterized in that two mutually facing annular beads ( 23 . 34 ) are provided. Brake disc cup according to one of claims 1 to 16, characterized in that the heat-expandable element of a radially expandable, but circumferentially positive interlocking teeth ( 27 . 37 ) consists. Brake disc cup according to claim 17, characterized in that the toothing ( 27 . 37 ) is resiliently biased. Brake disc cup according to one of claims 1 to 16, characterized in that the heat-expansible element consists of individual, uniformly distributed on the circumference arranged radially outwardly extending tabs ( 38 ) that surrounds the inner pot ring ( 6 ), at whose outer, free ends long holes ( 12 ) are arranged, in which with radial thermal expansion clearance of the outer pot ring ( 5 ) is attached.