DE102019103801A1 - Assembled brake disc and method of making such a brake disc - Google Patents

Abstract

The invention relates to an internally ventilated brake disc which comprises a friction ring (2) which delimits an inner opening (3) with an inner circumferential surface (8), and a holding part (14) formed from a sheet metal material which has a side wall section (16) which extends parallel to an axis of rotation (X) around which the brake disc (1) rotates during operation, sits in the inner opening (3) of the friction ring (2), the friction ring (2) and the holding part (14) via a form fit are non-rotatably connected to each other and ventilation channels (6) are formed in the friction ring (2), each starting from an inlet opening (7) formed in the inner circumferential surface (8) of the friction ring (2) in the radial direction (R) up to one outer peripheral surface (12) of the friction ring (2) extend. With such a brake disk, not only is it easy to manufacture, but also optimal ventilation during use is ensured by having at least one of the inlet openings (7) of the ventilation channels (6) formed in the inner circumferential surface (8) of the friction ring (2) in the side wall section (16) of the holding part (14) is associated with molded through opening (17) and the positive fit between the holding part (14) and the friction ring (2) is established in that the edge region (18) of the through opening (17) at least in sections to an in the associated inlet opening (7) engaging collar (20) is formed, which rests positively and tightly against a wall surface (10) which delimits the inlet opening (7).

Description

The invention relates to a built-in, internally ventilated brake disc which has a friction ring which, with an inner peripheral surface, delimits an inner opening and a holding part formed from a sheet metal material. The holding part has a side wall section which extends parallel to an axis of rotation about which the brake disc rotates during operation. This side wall section sits in the inner opening of the friction ring. The friction ring and the holding part are non-rotatably connected to one another via a form fit, ventilation channels being formed in the friction ring, each of which extends in the radial direction from an inlet opening formed in the inner circumferential surface of the friction ring to an outer circumferential surface of the friction ring.

The invention also relates to a method for producing such a built-up brake disc.

Brake disks of the type in question are used in motor vehicles and, during a braking process, are used to convert the kinetic energy of the vehicle into friction and, consequently, into heat. During a braking process, the brake shoes of the brake system act against the face-side friction surfaces of the friction ring of the brake disc. Internally ventilated brake discs have been introduced in order to dissipate the heat generated during braking particularly effectively. These are typically formed by two friction disks, which are arranged axially spaced apart and connected to one another via webs which delimit ventilation channels between them. The air flowing into the ventilation channels during operation via the inlet openings arranged in the area of the inner circumferential surface of the friction ring causes intensive heat dissipation.

The holding part of a brake disc, on the other hand, serves to couple the friction ring to the wheel of the respective vehicle to be braked. For this purpose, the holding part can be provided with a receptacle for a pivot bearing, via which the brake disc and the wheel are rotatably mounted on the respective axle. Alternatively, the holding part can also be designed in such a way that it is fastened directly or indirectly via the rim of the wheel to be braked via a brake disc according to the invention to a bearing ring of the pivot bearing, which sits on the respective axle, by means of suitable fastening means.

With regard to the dynamic behavior of the vehicle when driving, there is a fundamental effort to minimize the weight of a brake disc. At the same time, brake disks should also be able to be manufactured inexpensively with a view to the fact that they represent a wear part.

The desired weight reduction could be achieved in that the friction ring and the holding part of the brake disks of the type in question are made of different materials that are optimally adapted to the loads acting on them during use. The friction ring of built-up brake disks is usually molded from a cast iron material. In this way, not only is their inexpensive mass production possible, but good braking and wear behavior is also ensured.

The holding part of built brake disks, on the other hand, usually consists of a sheet metal material that is not only easy to shape, but also ensures optimal transmission of the braking torques to the wheel to be braked during a braking process due to the material properties inherent in the respective sheet metal material.

An example of a built-up brake disk of the type specified at the beginning, also referred to in technical jargon as a “composite brake disk”, is from FIG EP 2 673 525 B1 known. This internally ventilated brake disk comprises a holding part, which is usually designed as a brake disk chamber, and at least one associated brake ring, the holding part and the brake ring being connected to one another by means of a joining process. For this purpose, the brake ring has a tooth profile on the circumference of its inner opening, which engages in a joint area in a tooth profile formed on the outer circumference of the holding part. The brake disk cup tooth flanks of the retaining part tooth profile and the brake ring tooth flanks of the brake ring tooth profile have different fits in the joining area. At the same time, the cup-shaped holding part has a conical basic shape before the joining process and a reference diameter of the toothing that increases towards its open end, so that the holding part is deformed when its circumferential tooth profile is pressed into the tooth profile of the brake ring. In this way, the elasticity, which increases axially in the direction of the opening of the cup-shaped holding part, is to be compensated and a uniform load-bearing proportion is also to be achieved in the axial direction. During the joining process, at least the holding part experiences elastic and elastic-plastic deformation in the joining area. The interlocking tooth profiles of the friction ring and the holding part thus form shaped elements that are positively connected to one another via the brake ring and holding parts, this form-fitting connection in the example of a known brake disc explained here as a result of the deformation of the holding part that occurred when the brake disc and the holding part were joined by a Friction is supported. In doing so, through this special way of fixing the brake ring on the holding part a higher and more efficient material utilization can be achieved than with a conventional elastic design.

Against the background of the state of the art, the task was to create a built-up brake disc of the type specified at the beginning, which is not only easy to manufacture, but also ensures optimum ventilation during use.

A method for producing such a built-up brake disk should also be mentioned.

The invention has achieved this object by a brake disc having the features specified in claim 1.

A brake disk designed in this way can be produced particularly easily in the manner according to the invention specified in claim 11.

Advantageous embodiments of the invention are specified in the dependent claims and are explained in detail below, like the general inventive concept.

An internally ventilated brake disc built according to the invention accordingly comprises, in accordance with the prior art explained at the beginning, a friction ring which delimits an inner opening with an inner circumferential surface, and a holding part formed from a sheet metal material, which with a side wall section which extends parallel to an axis of rotation around the the brake disc rotates during operation, sits in the inner opening of the friction ring, the friction ring and the holding part being connected to one another in a rotationally fixed manner via a form fit and ventilation channels being formed in the friction ring, each of which extends from its inlet opening formed into the inner circumferential surface of the friction ring extend in the radial direction to an outer peripheral surface of the friction ring,

According to the invention, at least one of the inlet openings of the ventilation channels molded into the inner circumferential surface of the friction ring is assigned a through-opening molded into the side wall section of the holding part. At the same time, according to the invention, the positive fit between the holding part and the friction ring is produced in that the edge area of the through opening is shaped at least in sections into a collar that engages in the associated inlet opening and rests positively and tightly on a wall surface surrounding the inlet opening.

In a brake disk according to the invention, the non-rotatable connection between the friction ring and the holding part is thus produced in that, after the holding part has been inserted with its side wall section into the inner opening of the friction ring, in a forming operation from the edge area, which is the respective intended for this purpose, one of the inlet openings in the inner circumferential surface of the friction ring associated with the passage opening of the side wall section, a collar is formed, which engages in the associated inlet opening and rests tightly against the wall surface which delimits the venting channel of the friction ring extending from the inlet opening. The collar formed in this way produces a positive fit that is effective both in the axial direction of the axis of rotation of the brake disk and in the circumferential direction of the brake disk, via which the friction ring and holding part are fixed to one another in a rotationally fixed manner and secured against any axial displacement.

The design of a brake disk according to the invention has the advantage, from a manufacturing point of view, that the form-locking element causing the positive connection between the holding part and the friction ring, as the collar of the holding part reaching into the inlet opening of the friction ring, is only produced when the friction ring and the holding part have already been joined. In this way, a precisely fitting, non-rotatable connection between the friction ring and the holding part is obtained without the need for complex pre-machining or alignment of the friction ring and the holding part.

The design of a brake disc according to the invention thus allows a significantly simplified production, the positive interlocking of the holding part and friction ring produced according to the invention ensuring an unchanged, operationally reliable, non-rotatable coupling of the components forming the brake disc.

1. a) Bereitstellen eines Reibrings, der mit einer Innenumfangsfläche eine Innenöffnung umgrenzt, wobei in dem Reibring Belüftungskanäle ausgebildet sind, die sich jeweils ausgehend von ihrer in die Innenumfangsfläche des Reibrings eingeformten Eintrittsöffnung in radialer Richtung bis zu einer äußeren Umfangsfläche des Reibrings erstrecken,
2. b) Bereitstellen eines aus einem Blechmaterial gefertigten Halteteils, das einen Seitenwandabschnitt aufweist, der sich parallel zu einer Drehachse erstreckt, um die sich die Bremsscheibe im Betrieb dreht, wobei in den Seitenwandabschnitt des Halteteils mindestens eine Durchgangsöffnung eingeformt ist,
3. c) Einfügen des Halteteils mit seinem Seitenwandabschnitt in die Innenöffnung des Reibrings, wobei das Halteteil derart ausgerichtet wird, dass die mindestens eine in seinem Seitenwandabschnitt eingeformte Durchgangsöffnung einer der in die Innenumfangsfläche des Reibrings eingeformten Eintrittsöffnungen zugeordnet ist, und
4. d) zumindest abschnittsweises Umformen eines Randbereichs, der die mindestens eine Durchgangsöffnung umgrenzt, welche einer der in die Innenumfangsflächen des Reibrings eingeformten Eintrittsöffnungen zugeordnet ist, zu einem Kragen, der formschlüssig und dicht an einer die Eintrittsöffnung umgrenzenden Wandfläche anliegt.

In accordance with the design of a brake disk according to the invention, the method according to the invention for producing a brake disk constructed in this way comprises the following work steps:

1. a) Providing a friction ring which, with an inner circumferential surface, delimits an inner opening, wherein ventilation channels are formed in the friction ring, each of which extends from its inlet opening formed in the inner circumferential surface of the friction ring in the radial direction to an outer circumferential surface of the friction ring,
2. b) providing a holding part made from a sheet metal material, which has a side wall section which extends parallel to an axis of rotation about which the The brake disk rotates during operation, with at least one through opening being formed in the side wall section of the holding part,
3. c) inserting the holding part with its side wall section into the inner opening of the friction ring, the holding part being aligned such that the at least one through opening formed in its side wall section is assigned to one of the inlet openings formed in the inner circumferential surface of the friction ring, and
4. d) at least partially reshaping of an edge region which delimits the at least one passage opening, which is assigned to one of the inlet openings formed in the inner circumferential surfaces of the friction ring, to form a collar which lies positively and tightly against a wall surface surrounding the inlet opening.

For the production of a brake disk according to the invention, a holding part and a friction ring are therefore prefabricated independently of one another and made available for assembly.

Friction rings for brake disks according to the invention can be produced particularly cost-effectively, for example, by molding them in a well-known manner from a cast iron material that has already proven itself in practice. Examples of cast iron materials suitable for this purpose are the cast materials mentioned under the standard designation EN-GJL 150, EN-GJL-200.

The holding part provided in a brake disc according to the invention can consist, at least in the area of its side wall section seated in the inner opening of the friction ring, from a metal sheet known from the prior art for the production of such holding parts, in particular a sheet made of a steel or an aluminum material, which is a has sufficient deformability for the purposes of the invention. Suitable materials for this are the steel materials designated as "SC 420 MC" and "SC 355 MC" in accordance with EN 10149. In this case, the holding part is advantageously formed in one piece, for example by deep-drawing a correspondingly made-up sheet metal blank.

With regard to the properties of use of a brake disk produced according to the invention, it is particularly advantageous if the holding element and / or the friction ring are provided with a protective coating before the brake disk is installed. This protective coating can serve in particular to protect against corrosion or other attacks by aggressive media occurring in the operational environment for which the brake disc is intended. The protective coating can be applied in the course of the prefabrication of the friction ring or holding part. Applying a protective coating to the holding part and / or the friction ring before joining to the brake disc has the advantage that the coating is also present in the area of the joining zone and can develop its protective effect there on the finished brake disc.

An optimal form-fitting connection of the friction ring to the holding part can be achieved in that the collar molded into the respective inlet opening of the friction ring is shaped completely around the assigned passage opening. In order to facilitate the molding of the collar, the inlet openings can be circular. The fact that the edge surrounding the inlet openings is rounded or provided with a phase so that in the area of the respective inlet opening a funnel-like, fuzzy transition from the inner circumferential surface of the friction ring to the ventilation channel of the friction ring extending from the inlet opening can also contribute to facilitating the shaping of the collar is created.

The collar formed according to the invention from the edge region surrounding the respective through opening of the side wall section of the holding part can have a sleeve-like shape which extends over a certain length into the ventilation channel of the friction ring extending from the respective inlet opening. With regard to the long-term load-bearing capacity of the connection between the friction ring and the holding part made according to the invention via the collar, it has proven to be advantageous if the collar formed from the edge area delimiting the passage opening extends from the associated inlet opening over a length of at least 2 mm into the extends with the inlet opening connected ventilation channel.

The sleeve-like shape of the collar, which extends over a sufficient length into the respective ventilation duct, ensures that the friction disc is securely coupled to the holding part even in the event that the friction ring moves during a braking process due to the heat introduced into it and its resultant due to thermal expansion in the radial direction. In particular, if the holding part and / or the friction ring are provided with a protective coating before the brake disc is installed, it is ensured that this expansion is not hindered by corrosion that could otherwise occur in the area in which the respective one formed on the holding part Collar engages in the relevant ventilation channel of the friction ring via the respectively assigned inlet opening.

A particularly noteworthy advantage of the design of a brake disk according to the invention is that a free air supply to the ventilation channels of the friction ring can be guaranteed during use via the through openings formed in the side wall section.

Depending on the loads to which the brake disk is exposed during use, not all of the edge regions delimiting the through openings have to be shaped in the manner according to the invention into collars, via which a form fit between the friction ring and the holding part is established. Rather, it can be sufficient if such a collar is formed only for a certain number of through openings, while this is not the case with other through openings. For example, it is possible that the number of those inlet openings formed in the inner circumferential surface of the friction ring, each of which is assigned a through opening of the side wall section of the holding part to produce the form fit, the edge area of which is shaped into a collar that engages in the respectively assigned inlet opening for the purpose of producing the form fit , is smaller than the total number of inlets. In this case, for example, only every second or third through opening is a collar producing the form fit.

However, if particularly large braking torques are to be absorbed and the braking torques to be absorbed by the holding part during braking are to be transmitted more evenly to the holding part, this can be achieved in that each inlet opening of the friction ring is assigned a passage opening, the edge area of which in the manner according to the invention leads to one in the respective inlet opening and the outgoing ventilation channel extending collar is formed.

The uniformity of the power transmission and the ventilation of the friction ring can also be contributed by the fact that the inlet openings of the ventilation channels on the one hand and the through openings, the edge area of which is formed into a collar engaging in the respectively assigned inlet opening, on the other hand, at regularly equal angular distances around the The axis of rotation of the brake disc are arranged distributed.

A brake disk of the type according to the invention has a certain number of inlet openings on the inner circumferential surface of its friction ring, to which an equal number of through openings are advantageously assigned in the side wall section of the holding part, with optimally each through opening of the holding part being aligned concentrically with respect to an assigned inlet opening of the friction ring, in order to achieve the best possible flow of air into the ventilation channels of the friction ring during use.

In the event that the number of through openings, the edge area of which is shaped into a collar in the manner according to the invention, is smaller than the number of available inlet openings, it has proven useful if the regular angular distance between the through openings of the side wall section of the holding part, their edge area for the purpose of Production of the form fit is formed into a collar engaging in the respectively assigned inlet opening, is an integral multiple of the regular angular distance between the inlet openings in the inner circumferential surface of the friction ring.

The deformation of the edge region which delimits the respective through opening in the side wall section of the holding part to form the collar is preferably carried out by cold deformation. Such a deformation can not only be carried out particularly easily, but also leads to a solidification of the deformed material, which supports the particularly resilient positive support of the friction ring on the holding part brought about according to the invention. Such cold deformation can take place, for example, in that the sheet metal material of the side wall section which forms the relevant edge area and delimits the respective passage opening is reshaped from the inside of the side wall section by pressing using a mandrel tool. The devices required for this are already known from the prior art.

wobei hier mit „Dv“ der maximale Durchmesser der in das bereitgestellte (Arbeitsschritt b)) Halteteil eingeformten, also vor dem Formen des Kragens vorhandenen Durchgangsöffnung und mit „De“ der maximale Durchmesser bezeichnet sind, den die betreffende Durchgangsöffnung nach dem Umformen (Arbeitsschritt c)) des Randbereichs zu dem Kragen aufweist.In order to enable the formation of a collar provided according to the invention on the respective through opening of the holding part, in a holding part provided for the production of the brake disc according to the invention (step b)) the through opening provided for the deformation according to the invention expediently has a smaller diameter than before the collar is formed with the finished brake disc. To this end, it has proven useful if for the diameter ratio Dv / De applies $$0.42\le \text{Dv}/\text{De}\le \mathrm{0.65,}$$

"Dv" denotes the maximum diameter of the through opening formed in the provided (work step b)) holding part, i.e. existing before the formation of the collar, and "De" denotes the maximum diameter that the relevant through opening after forming (work step c )) of the edge area to the collar.

To support a precise fit of the holding part in the inner opening of the friction ring, it can be advantageous if there is a press fit between the friction ring and the holding part in a brake disk according to the invention. For this purpose, the side wall section of the holding part provided, which is assigned to the inner opening of the friction ring, can be oversized in relation to the inner opening and, during the manufacture of the brake disc, the side wall section of the holding part can be pressed into the inner opening, so that after the projection has been pressed into the recess in addition to that made by the projection and the recess produced a positive connection between the friction ring and the holding part. For this purpose can for that from the outside diameter There of the side wall portion and the inner diameter Tuesday the ratio formed by the inner opening Da / Tu The following applies: 1.0 <Da / Di ≤ 1.2.

• 1 eine innenbelüftete Bremsscheibe in einer perspektivischen, teilweise aufgeschnittenen Ansicht;
• 2 ein Halteteil für die in 1 dargestellte Bremsscheibe im für die Montage bereitgestellten Zustand in einem Schnitt längs der in 1 eingezeichneten Schnittlinie A-A;
• 3 einen Reibring für die in 1 dargestellte Bremsscheibe im für die Montage bereitgestellten Zustand in einem Schnitt längs der in 1 eingezeichneten Schnittlinie A-A;
• 4 das Halteteil gemäß 2 und den Reibring gemäß 3 im für die Montage der in 1 dargestellten Bremsscheibe gefügten Zustand in einem Schnitt entlang der in 1 eingezeichneten Schnittlinie A-A;
• 5 die fertig montierte Bremsscheibe gemäß 1 in einem Schnitt entlang der in 1 eingezeichneten Schnittlinie A-A.

The invention is explained in more detail below with the aid of a drawing showing an exemplary embodiment. Their figures each show schematically:

• 1 an internally ventilated brake disc in a perspective, partially cut-away view;
• 2 a holding part for the in 1 Brake disc shown in the state made available for assembly in a section along the in 1 drawn section line AA;
• 3 a friction ring for the in 1 Brake disc shown in the state made available for assembly in a section along the in 1 drawn section line AA;
• 4th the holding part according to 2 and the friction ring according to 3 im for mounting the in 1 shown brake disc joined state in a section along the in 1 drawn section line AA;
• 5 the fully assembled brake disc according to 1 in a section along the in 1 drawn section line AA.

For mounting the in the 1 and 5 Brake disc constructed according to the invention shown in the fully assembled state 1 on the one hand is an internally ventilated friction ring 2 has been provided, which has been cast from a cast iron material known for this purpose and an inner opening 3 circumscribed.

The friction ring cast as one piece in a known manner 2 includes two friction discs 4a , 4b , which are arranged at a distance from one another in the axial direction AR of the axis of rotation X and via webs which extend in the radial direction R and which are shown by casting between them in a known manner 5 are interconnected. Adjacent webs 5 delimit a ventilation channel at the side 6th .

The ventilation channels 6th are in relation to the thickness of the friction ring measured axially parallel to the axis of rotation X. 2 in the middle between the friction disks 4a , 4b arranged and each open into an inlet opening 7th that are in the inner peripheral surface 8th is molded around the inner opening 3 of the friction ring 2 circulates. There are in the friction ring 2 for example 24 ventilation channels 6th with a corresponding number of inlet openings 7th formed at regular angular intervals ß distributed around the axis of rotation X in the inner opening 3 are arranged. The the inlets 7th surrounding edge 9 is rounded, so that a smooth, jump-free transition from the inner peripheral surface 8th to the inner wall surface 10 of the respective ventilation duct 6th is made. The outlet openings 11 the ventilation channels 6th are in a correspondingly even distribution on the outer circumferential surface 12 of the friction ring 2 educated.

The friction disks wear on their outer end faces 4a , 4b of the friction ring 2 each has an annular friction surface 13a , 13b , against which a brake lining of a brake system, not shown here, of the vehicle, also not shown here, acts in use, on which the brake disc 1 is mounted rotatable about an axis of rotation X for use.

As an additional component for assembling the brake disc 1 is a cup-shaped holding part formed in one piece by deep drawing from a sheet steel blank 14th provided. The sheet steel from which the holding part is made 14th is shaped, consisted of a steel already proven for the production of such holding parts in the prior art and has a bottom 15th on. In the ground 15th are formed at equal angular intervals around the axis of rotation X arranged assembly openings through which the wheel bolts or the like, not shown here, engage during assembly on the axle of the respective vehicle, through which the fastening of the brake disc and the one also mounted on the axle, over the brake disc 1 braked wheel takes place. In addition, the holding part 14th in its bottom 15th a central opening through which a brake disc mounted on the respective vehicle axle 1 For example, a wheel bearing or the like is accessible on the axle of the vehicle.

To the ground 15th of the holding part 14th runs an annular cylindrically shaped side wall section 16 around, starting from the ground 15th extends parallel to the axis of rotation X. The height measured axially parallel to the axis of rotation X. H of the side wall section 16 is greater than the thickness D. of the friction ring 2 .

At the same time is the outside diameter There of the side wall section 16 about 10% larger than the inner diameter Tuesday the circular inner opening 3 of the friction ring 2 so here for the ratio Da / Tu Da / Di = 1.1 applies.

In the side wall section 16 are 24 Through openings 17th at regular angular intervals ß molded in a distributed manner. The passage openings 17th have a diameter in the state ready for assembly Dv which is smaller than the diameter of the inlet openings 7th on the inner peripheral surface 8th of the friction ring 2 . The center of the through openings 17th is centered in relation to the height H of the side wall section 16 aligned.

The friction ring provided, as explained above 2 and the holding part provided, as also explained above 14th are each completely covered with a protective coating that covers the friction ring 2 and the holding part 14th protects against corrosion and has been produced by applying a corrosion protection agent known per se. For example, a conventional anti-corrosion coating, such as zinc dust paint, or a material diffused in via a nitriding process, which is applied to the holding part by dipping, spraying or, in the case of a nitriding process, by diffusion, can be used as the anti-corrosion agent for this purpose 14th and the friction ring 2 can be applied.

In the first step of assembling the brake disc 1 becomes the holding part 14th in the friction ring 2 inserted by the holding part 14th from one friction surface 13a of the friction ring 2 into the inner opening 3 of the friction ring 2 is pressed. The holding part is thereby 14th so aligned and so far into the inner opening 3 inserted that every through opening 17th of the holding part 14th in the assembled state, each concentric to an inlet opening assigned to it 7th that in the inner peripheral surface 3 of the friction ring 2 molded inlet openings 7th is aligned. Due to the fact that the original, in the state of the holding part made available for assembly 14th given diameter Dv the through openings 17th is smaller than the diameter of the inlet openings 7th , overlap after inserting the holding part 14th in the friction ring 2 the the through openings 17th bounding edge areas 18th of the side wall section 16 the respectively assigned inlet opening 7th .

These marginal areas 18th are in the following step using a mandrel tool 19th to one in the respective inlet opening 7th gripping collar 20th shaped. The mandrel tool contributes to this 19th a cone-shaped pointed mandrel 21st on, which in the radial direction R against the inside of the side wall portion 16 directed into the respective through opening 17th is pressed whose edge area 18th each to the collar 20th to be shaped. The pushing movement is continued until the through opening 17th surrounding edge area 18th into the assigned inlet opening 7th is molded in and close to the inner wall surface 10 of the ventilation duct 6th from the relevant inlet opening 7th going off. This cold deformation creates the through openings 17th expanded so that there is a diameter ratio Dv / De from 0.42 - 0.65 results. At the same time, the cold deformation of the edge area gives the 18th formed collar 20th a sleeve-like shape and extends over a length L. of typically ≥ 2 mm in the respective ventilation channel 6th inside.

In the manner explained above, at each of the 24 Through openings 17th of the side wall section 16 a collar 20th shaped over which the friction ring 2 each positively in the axial direction AR, in the radial direction R and in the circumferential direction U of the brake disc 1 on the holding part 14th is fixed. The non-rotatable connection created in this way between the friction ring 2 and the holding part 14th ensures reliable transmission of the braking torques that occur during braking from the friction ring 2 about the holding part 14th each with the brake disc 1 coupled vehicle wheel, not shown here.

The friction ring of the brake disc during braking 1 introduced heat is dissipated via the air currents, which in use through the widened passage openings 17th unhindered in the ventilation channels assigned to each 6th can flow in.

The before assembly on the friction ring 2 and the holding part 14th applied anti-corrosion coating prevents even after assembly in the area of the contact zones between the holding part 14th and the friction ring 2 , so in particular in the area in which the outer peripheral surface of the side wall section 16 of the holding part 14th on the inner peripheral surface 8th of the friction ring 2 rests and in the area where the collar 20th on the inner wall surface 10 of the respective ventilation duct 6th concern the formation of corrosion.

List of reference symbols

1

Brake disc

2

internally ventilated friction ring

3

Inner opening of the friction ring 2

4a, 4b

Friction discs of the friction ring 2

5

Bridges

6th

Ventilation channels

7th

Inlet opening of the ventilation channels 6th

8th

Inner peripheral surface of the friction ring 2

9

the inlet openings 7th each surrounding edge

10

Inner wall surface of the respective ventilation channel 6th

11

Outlet openings of the ventilation channels 6th

12

Outer peripheral surface of the friction ring 2

13a, 13b

Friction surface of the friction ring 2

14th

Holding part

15th

Bottom of the holding part 14th

16

Side wall portion of the holding part 14th

17th

Through openings in the side wall section 16

18th

the through openings 17th bounding edge areas

19th

Mandrel tool

20th

from the edge areas 18th shaped collar

21st

Mandrel of the mandrel tool 19th

AR

Axis direction of the axis of rotation X

ß

Angular distances between the inlet openings 7th and the through openings 17th

D.

Thickness of the friction ring 2

There

Outside diameter of the side wall section 16

Tuesday

Inner diameter of the inner opening 3

De, Dv

Diameter of the passage openings

H

Height of the side wall section 16

L.

Length of the collar 20th

R.

radial direction

U

Circumferential direction of the brake disc 1

X

Axis of rotation of the friction ring 2

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• EP 2673525 B1 [0008]

Claims (15)

Constructed internally ventilated brake disc, which comprises a friction ring (2) which delimits an inner opening (3) with an inner circumferential surface (8), and a holding part (14) formed from a sheet material, which has a side wall section (16) which extends parallel to a The axis of rotation (X) around which the brake disc (1) rotates during operation is seated in the inner opening (3) of the friction ring (2), the friction ring (2) and the holding part (14) being non-rotatably connected to one another via a form fit and wherein ventilation channels (6) are formed in the friction ring (2), each starting from an inlet opening (7) formed in the inner circumferential surface (8) of the friction ring (2) in the radial direction (R) up to an outer circumferential surface (12 ) of the friction ring (2), characterized in that at least one of the inlet openings (7) of the ventilation channels (6) formed in the inner peripheral surface (8) of the friction ring (2) is one in the side wall section (16) of the holding part (14) rammed through opening (17) is assigned and that the form fit between the holding part (14) and the friction ring (2) is produced in that the edge area (18) of the through opening (17) at least partially engages in the assigned inlet opening (7) Collar (20) is formed, which rests positively and tightly against a wall surface (10) which delimits the inlet opening (7). Brake disc after Claim 1 , characterized in that the collar (20) is formed completely circumferentially around the through opening (17). Brake disc according to one of the preceding claims, characterized in that the inlet openings (7) of the ventilation ducts (6) on the one hand and the through openings (17), their edge area (18) for producing the form fit to a collar reaching into the respectively assigned inlet opening (7) (20) are formed, on the other hand are arranged distributed at regularly equal angular intervals (ß) around the axis of rotation (X) of the brake disc (1). Brake disc according to one of the preceding claims, characterized in that each inlet opening (7) formed in the inner circumferential surface (8) of the friction ring (2) is assigned a through opening (17) of the side wall section (16) of the holding part (14), the edge region (18) of which ) is shaped into a collar (20) which engages in the respectively assigned inlet opening (7) for the purpose of producing the form fit. Brake disc after one of the Claims 1 to 3 , characterized in that the number of those in the inner circumferential surface (8) of the friction ring (2) molded entry openings (7), each of which is assigned a through opening (17) of the side wall section (16) of the holding part (14) to produce the form fit Edge region (18) is shaped into a collar (20) engaging in the respectively assigned inlet opening (7) for the purpose of producing the form fit, is smaller than the total number of inlet openings (7). Brake disc after Claim 3 and 5 , characterized in that the regular angular spacing (ß) between the through openings (17) of the side wall section (16) of the holding part (14), the edge area (18) of which for the purpose of producing the form fit to a collar which engages in the respectively assigned inlet opening (7) ( 20) is an integral multiple of the regular angular distance (ß) between the inlet openings (7) in the inner circumferential surface of the friction ring (2). Brake disc according to one of the preceding claims, characterized in that the collar (20) formed from the edge region (18) delimiting the through opening (17) extends from the associated inlet opening (7) over a length (L) of at least 2 mm into the with the inlet opening (7) connected ventilation channel (6) extends. Brake disc according to one of the preceding claims, characterized in that the sheet metal material of the holding part (14) consists of an aluminum material. Brake disc after one of the Claims 1 to 7th , characterized in that the sheet metal material of the holding part (14) consists of a steel material. Brake disc according to one of the preceding claims, characterized in that the friction ring (2) is produced by casting from a cast iron or aluminum material. A method for producing a brake disc (1) designed according to one of the preceding claims, comprising the following work steps: a) Providing a friction ring (2) which, with an inner circumferential surface (8), delimits an inner opening (3), with ventilation channels (2) in the friction ring (2). 6) are formed, each starting from an inlet opening (7) formed in the inner circumferential surface (8) of the friction ring (2) in the radial direction (R) to an outer circumferential surface (12) of the friction ring (2), b) Providing a holding part (14) made of a sheet metal material, which has a side wall section (16) which extends parallel to an axis of rotation (X) around which the brake disc (1) extends Operation rotates, wherein in the side wall section (16) of the holding part (14) at least one through opening (17) is formed, c) inserting the holding part (14) with its side wall section (16) in the inner opening (3) of the friction ring (2), wherein the holding part (14) is aligned such that the at least one through opening (17) formed in its side wall section (16) is associated with one of the inlet openings (7) formed in the inner circumferential surface (8) of the friction ring (2), and d) at least section-wise reshaping of an edge region (18) which delimits the at least one through opening (17), which is assigned to one of the inlet openings (7) formed in the inner circumferential surfaces (8) of the friction ring (2), to form a collar (20) which is positively and closely rests against a wall surface (10) bounding the inlet opening (7). Procedure according to Claim 11 , characterized in that the holding part (14) and / or the friction ring (2) are provided with a protective coating before the insertion (step c)). Method according to one of the Claims 11 or 12 , characterized in that the edge region (18) which delimits the at least one through opening (17) which is assigned to one of the inlet openings (7) formed in the inner circumferential surfaces (8) of the friction ring (2), by means of a mandrel tool (19), which is pressed against the inside of the side wall section (16) is deformed to form the collar (20). Method according to one of the Claims 11 to 13th , characterized in that for the through opening (17) formed from the maximum diameter Dv of the holding part (14) provided (work step b)) and the maximum diameter De of the through opening (17) after reshaping (work step c)) of the edge area (18) the resulting diameter ratio Dv / De applies: $$0.42\le \text{Dv}/\text{De}\le \mathrm{0.65,}$$

Method according to one of the Claims 11 to 14th , characterized in that the ratio Da / Di formed from the outside diameter Da of the side wall section (16) of the holding part (14) and the inside diameter Di of the inside opening (3) of the friction ring (2) applies: $$1.0\le \text{There}/\text{Tuesday}\le \mathrm{1.2.}$$

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