DE102018130489A1 - Brake disc with ventilation and brake system with brake disc - Google Patents

Abstract

The invention relates to a brake disc (1) for a brake system (2) of a motor vehicle, with an axial first contact surface (3) and an axial second contact surface (4) opposite the first contact surface (3) in the axial direction, which are used for frictional connection with a Brake disc element (5) are arranged and designed, and with an in the axial direction between the first contact surface (3) and the second contact surface (4) arranged inner section (6), in the inner section (6) to a radial outside (7) and to A radial inside (8) of the brake disc (1) has open recesses (9) for ventilation. The invention further relates to a brake system (2) with such a brake disc (1).

Description

The invention relates to a brake disc for a brake system of a motor vehicle, with an axial first contact surface and an axial second contact surface opposite the first contact surface in the axial direction, which are arranged and designed for frictional connection with a brake disc element, preferably with a toothing for rotationally fixed coupling with a the brake disc axially displaceably receiving support part, and with an inner portion arranged in the axial direction between the first contact surface and the second contact surface. Furthermore, the invention relates to a brake system with such a brake disc.

Brake disks with ventilation systems are already known from the prior art. For example, the DE 20 2004 005 284 U1 a brake disc for the disc brake of a motor vehicle with recesses serving for ventilation, the brake disc consisting of two outer discs and an inner disc arranged between them and integrally or positively connected to it, the discs being provided with aligned recesses and at least some of the recesses the inner disc are formed open to the periphery.

However, the prior art always has the disadvantage that in the case of a brake disc, there is often no internal ventilation for removing the frictional heat. With a full-surface brake in particular, it is difficult to integrate ventilation, since the braking surface of the brake disc must be as flat as possible and without recesses.

It is therefore the object of the invention to avoid or at least to reduce the disadvantages of the prior art. In particular, a brake disc and a brake system with such a brake disc are to be provided, in which ventilation is integrated in a particularly simple manner, without the braking function being impaired.

The object of the invention is achieved in a generic device according to the invention in that open recesses for ventilation are formed in the inner section to a radial outside and to a radial inside of the brake disc. This means that the recesses are not provided in the contact surfaces, but only between the contact surfaces. Air can flow through the cutouts radially from the inside to the outside and / or from the outside to the inside in order to remove the heat.

This has the advantage that the (friction) heat is absorbed via the outer surfaces / contact surfaces of the brake disc, on which the friction linings attach. On the one hand, the contact surfaces are not available as convection surfaces and, on the other hand, the contact surfaces must be as flat and free of recesses as possible so as not to impair the braking performance. The heat can therefore be emitted through the cutouts in the interior of the brake disc. On the one hand, this increases the convection area and, on the other hand, enables a flow of air to pass through.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

In addition, it is expedient if the brake disc has at least two inner plates designed as sheet metal components, each having first openings open to the radial outside and / or second openings opened to the radial inside, the first openings and the second openings of the inner plates adjacent in the axial direction are so partially aligned with each other in the axial direction that they form the recesses. The brake disc is therefore made up of several (sheet metal) discs / plates. Thanks to this disc-type / sandwich-type brake disc, the inner plates can be used for ventilation. The inner sheets / inner disks, which do not provide a contact surface for the friction linings, can be perforated and slotted in a wide variety of patterns.

Alternatively, it is possible to design the brake disc as a cast component. Due to the lack of separation within the brake disc, in contrast to the design in (sheet) lamella construction, the heat transfer is improved.

In a preferred embodiment, the brake disc can have two outer plates designed as sheet metal components, each of which constitutes the first contact surface or the second contact surface, the inner plates being arranged in the axial direction between the outer plates. According to an advantageous development, the outer slats and / or the inner slats can be designed as identical parts. This keeps the number of different required components as low as possible. So the brake disc can be manufactured inexpensively.

It is also advantageous if the first and / or second openings are inclined to the radial direction and / or the circumferential direction. This creates a slotted hole pattern, which enables a particularly high stiffness of the brake disc.

Furthermore, the invention relates to a brake system for a motor vehicle, in particular for an electric wheel drive unit, with a housing which can be fixedly attached to the vehicle frame, a first support part connected to the housing and a brake disk element connected non-rotatably to the first support part, and with a second support part which is rotatably mounted relative to the housing and a non-rotatably connected to the second supporting part, arranged and designed for frictional connection with the brake disc element - designed - brake disc. Furthermore, the brake system for frictionally connecting the brake disc and the brake disc element to one another has a hydraulic actuation system, in particular in the manner of a concentric actuation system, preferably in the manner of a concentric multi-piston system.

In other words, the invention relates to multi-piston systems, brake systems, in particular in the manner of a concentric brake cylinder (CBC). According to the invention, a brake disc is presented which has ventilation holes radially between the outer and inner regions. The brake disc is constructed through the axial nesting of various sheet metal discs. The sheet metal disks each have slots from the radially outside and / or inside. A hole pattern can be created in this way. In a first exemplary embodiment, ventilation is arranged on a brake disc with (external) toothing in the same rhythm as the toothing. By simply moving, in particular twisting, individual sheet metal disks, an (air) permeable structure for internal ventilation can be produced. The brake disk can be produced from four components, but only two different sheet metal disks are required. In a second exemplary embodiment, the slots in the sheet metal disks are arranged in an interlaced manner in that the sheet metal disks are placed on top of one another in a mirrored manner. In a third exemplary embodiment, the slots in adjacent sheet metal disks are connected via transverse geometries.

• 1 bis 4 verschiedene Darstellungen einer erfindungsgemäßen Bremsscheibe und ihrer Einzelteile in einer ersten Ausführungsform,
• 5 bis 7 verschiedene Darstellungen der Bremsscheibe und ihrer Einzelteile in einer zweiten Ausführungsform,
• 8 bis 12 verschiedene Darstellungen der Bremsscheibe und ihrer Einzelteile in einer dritten Ausführungsform, und
• 13 und 14 Längsschnittdarstellung eines erfindungsgemäßen Bremssystems mit der erfindungsgemäßen Bremsscheibe in zwei Ausführungsformen.

The invention is explained below with the aid of figures. Show it:

• 1 to 4th different representations of a brake disc according to the invention and its individual parts in a first embodiment,
• 5 to 7 different representations of the brake disc and its individual parts in a second embodiment,
• 8th to 12 different representations of the brake disc and its individual parts in a third embodiment, and
• 13 and 14 Longitudinal sectional view of a brake system according to the invention with the brake disc according to the invention in two embodiments.

The figures are only schematic in nature and serve only to understand the invention. The same elements are identified by the same reference symbols. Features of different exemplary embodiments can be interchanged as desired.

1 shows a brake disc according to the invention 1 in a first embodiment for an in 12 and 13 brake system shown in more detail 2nd a motor vehicle. The brake disc 1 has an axial first contact surface 3rd and an axial second contact surface 4th that of the first contact surface 3rd opposite in the axial direction. The first investment area 3rd and the second contact surface 4th are a frictional connection with an in 12 and 13 shown brake disc element 5 arranged and laid out. In the axial direction between the first contact surface 3rd and the second contact surface 4th is an interior section 6 arranged.

In the inner section 6 are to a radial outside 7 and to a radial inside 8th the brake disc 1 open recesses 9 trained for ventilation. The brake disc 1 has an essentially annular cross section. In the illustrated exemplary embodiments, the brake disc has 1 a circular inner circumference so that the radial inside 8th corresponds to the area of a cylinder jacket. In the exemplary embodiments shown, the radial outside faces 7 the brake disc 1 an external toothing 10th on its outer circumference. Alternatively, it is possible to use the brake disc 1 to be formed with an internal toothing and a circular outer circumference, even if this is not shown.

The brake disc 1 is built in lamellar or sandwich construction. The brake disc 1 has several slats 11 which are layered on top of one another in the axial direction / firmly connected to one another in the axial direction. The slats 11 are designed as sheet metal components. The brake disc 1 has two outer slats 12 on the the axial end faces of the brake disc 1 form. One outer slat 12 represents the axial first contact surface 3rd and the other outer slat 12 represents the axial second contact surface 4th . In the axial direction between the outer slats 12 are inner slats 13 arranged. The inner slats 13 form the inner section 6 the brake disc 1 . In the illustrated embodiments, there are two inner slats 13 available. But it is also possible to use the brake disc 1 with more than two inner slats 13 , for example three, four, five, six or more than six inner slats 13 to train.

In the first embodiment of the brake disc 1 are the outer slats 12 trained as identical parts. In the first embodiment, the inner fins are 13 trained as identical parts. The inner slat 13 is in 2nd shown in more detail. In the inner slat 13 are to the radial outside 7 opened first openings 14 educated. The first openings 14 extend (exactly) in the radial direction towards the radial inside 8th there. The first openings 14 are in the axial direction as a through hole through the inner lamella 13 and formed in the radial direction as a blind hole. The first openings 14 have the shape of a slit with a constant width. The first openings 14 are evenly distributed over the circumference of the inner lamella 13 arranged. In the illustrated embodiment, the first openings 14 in the circumferential direction centered on every second tooth of the external toothing 10th arranged. The first openings 14 extend in the radial direction over half a ring width of the inner lamella 13 .

In the inner slat 13 are to the radial inside 8th opened second openings 15 educated. The second openings 15 extend (exactly) in the radial direction towards the radial outside 7 there. The second openings 15 are in the axial direction as a through hole through the inner lamella 13 and formed in the radial direction as a blind hole. The second openings 15 have the shape of a slit with a constant width. The second openings 15 are evenly distributed over the circumference of the inner lamella 13 arranged. In the illustrated embodiment, the first openings 15 in the circumferential direction centered on every second tooth of the external toothing 10th arranged. The second openings 15 extend in the radial direction over half a ring width of the inner lamella 13 . The first openings 14 and the second openings 15 are arranged alternately in the circumferential direction.

In 3rd is the inner section 6 the brake disc 1 shown. The inside section 6 is made up of two inner lamellae which are arranged adjacent to one another in the axial direction 13 educated. The inner slats 13 are arranged rotated to each other in the circumferential direction. The inner slats 13 are by a pitch of the teeth of the external toothing 10th twisted to each other. As a result, the inner slats point 13 a common outer contour and a common inner contour. The inner slats 13 are so arranged that the first openings 14 an inner slat 13 circumferentially at the same height as the second openings 14 an inner lamella adjacent in the axial direction 13 are arranged. This means that a first opening overlaps 14 and a second opening 15 in the axial direction. Through the overlapping first and second openings 14 , 15 become the recesses 9 that go both to the radial inside 7 as well as to the radial outside 8th are open, formed.

In 4th it can be seen that the recesses 9 a central portion formed as a through hole in the axial direction 16 have, in which the first openings 14 and the second openings 15 overlap. An outer section 17th of the recesses 9 is through the part of the first openings 14 formed in the axial direction not with the second openings 15 overlap. The outer section 17th is to the radial outside 7 open towards. An inner section 18th of the recesses 9 is through the part of the second openings 15 formed in the axial direction not with the first openings 14 overlap. The inner section 18th is to the radial inside 8th open towards.

5 shows the brake disc 1 in a second embodiment, which corresponds to the first embodiment, apart from the formation of the recesses 9 , in particular the arrangement and design of the first openings 14 and the second openings 15 . The inner slats 13 are formed as identical parts in the second embodiment.

In 6 is an inner lamella 13 the brake disc 1 shown in the second embodiment. In the inner slat 13 are those to the radial outside 7 opened first openings 14 educated. The first openings 14 extend to the radial direction and the circumferential direction inclined toward the radial inside 8th there. The first openings 14 are in the axial direction as a through hole through the inner lamella 13 and formed in its longitudinal direction as a blind hole. The first openings 14 have the shape of a slit with a constant width. The first openings 14 are evenly distributed over the circumference of the inner lamella 13 arranged. The first openings 14 extend in the radial direction over half a ring width of the inner lamella 13 . In the second embodiment, the first openings open 14 in the circumferential direction in the middle between two teeth of the external toothing 10th to the radial outside 7 there.

In the inner slat 13 are those to the radial inside 8th opened second openings 15 educated. The second openings 15 extend inclined toward the radial direction and the circumferential direction toward the radial outside 7 there. The second openings 15 are in the axial direction as a through hole through the inner lamella 13 and formed in its longitudinal direction as a blind hole. The second openings 15 have the shape of a slit with a constant width. The second openings 15 are evenly distributed over the circumference of the inner lamella 13 arranged. The second openings 15 extend in the radial direction over half a ring width of the inner lamella 13 . The first openings 14 and the second openings 15 are arranged alternately in the circumferential direction.

In 7 is the inner section 6 the brake disc 1 shown in the second embodiment. The inside section 6 is made up of two inner lamellae which are arranged adjacent to one another in the axial direction 13 educated. The inner slats 13 are arranged mirrored in the axial direction. That is, the first axial side of an inner lamella 13 on the first axial side of the other inner lamella 13 abuts and the second axial sides of the two inner fins 13 are each arranged axially on the outside. The inner slats 13 are aligned with each other in the circumferential direction so that the inner slats 13 have a common outer contour and a common inner contour.

Due to the inclination of the inner slats 13 relative to the radial direction and the circumferential direction, a first opening each overlap 14 and a second opening 15 partly in the axial direction. The first and second openings 15 are interlaced, ie arranged in a grid. Through the overlapping first and second openings 14 , 15 become the recesses 9 that go both to the radial inside 7 as well as to the radial outside 8th are open, formed. The cutouts 9 the brake disc 1 in the second embodiment, the central section formed as a through hole in the axial direction 16 on where the first openings 14 and the second openings 15 overlap. The outer section 17th of the recesses 9 is through part of the first openings 14 formed in the axial direction not with the second openings 15 overlap. The outer section 17th is to the radial outside 7 open towards. The inner section 18th of the recesses 9 is through part of the second openings 15 formed in the axial direction not with the first openings 14 overlap. The inner section 18th is to the radial inside 8th open towards.

8th shows a third embodiment of the brake disc 1 , which corresponds to the first embodiment, except for the formation of the recesses 9 , in particular the arrangement and design of the first openings 14 and the second openings 15 . 9 shows a first inner lamella 19th . The first inner slat 19th points to the radial outside 7 open first openings 14 on. The first openings 14 have a radial section 20th which is (exactly) in the radial direction towards the radial inside 8th extends and a transverse section 21 on that is perpendicular to the radial section 20th extends. The first openings 14 have the shape of a T-slot with a constant width. The first openings 14 are evenly distributed over the circumference of the first inner lamella 19th and in the circumferential direction in the middle of every second tooth of the external toothing 10th arranged.

10th shows a second inner lamella 22 . The second inner slat 22 points to the radial inside 8th open second openings 15 on. The second openings 15 have a radial section 23 which is (exactly) in the radial direction towards the radial outside 7 extends and a transverse section 24th on that is perpendicular to the radial section 22 extends. The second openings 15 have the shape of a T-slot with a constant width. The second openings 15 are evenly distributed over the circumference of the second inner lamella 22 and in the circumferential direction in the middle of every second tooth of the external toothing 10th arranged.

11 shows the inner section 6 the brake disc 1 in the third embodiment. The first inner slat 19th is circumferential to the second inner lamella 22 arranged so that the first openings 14 and the second openings 15 are arranged alternately in the circumferential direction. The first openings overlap 14 and the second openings 15 in the axial direction in the area of the cross sections 21st , 24th . The first and second openings 14 , 15 form the recesses 9 . In 12 are the second openings 15 indicated by dashed lines, as in the view shown from the first inner lamella 19th are covered.

12 and 13 show the braking system 2nd with the brake disc 1 in two different embodiments. The braking system 2nd has a housing which can be fixed to the vehicle frame 25th , one with the housing 25th firmly connected first support part 26 as well as the rotationally fixed with the first supporting part 26 connected brake disc element 5 on. The braking system 2nd also has a relative to the housing 25th rotatably mounted second support part 27th and the non-rotatable with the second support part 27th connected to the frictional connection with the brake disc element 5 arranged and trained brake disc 1 on.

For actuating the brake system 2nd , ie for frictionally connecting the brake disc 1 and the brake disc element 5 with each other, is typically a hydraulic actuator 28 intended. This hydraulic actuator 28 has a cylinder housing 29 on that radially inside the brake disc 1 is arranged. Slidable in the axial direction in the cylinder housing 29 are several pressure pistons distributed in the circumferential direction 30th the actuator 28 slidably added. The pressure pistons 30th are non-displaceable with a sliding element 31 , coupled in the manner of a pressure pot, and act via this sliding element 31 adjusting to the relative position of the brake disc 1 and the brake disc element 5 a. The sliding element 31 thus serves to transmit a (braking) actuating force during operation. The sliding element 31 is shaped in such a way that it is operated by a hydraulic pressure on the pressure piston 30th generated braking force on the brake disc element 5 transmits. When actuating the actuating device 28 thus becomes a between the cylinder housing 29 and the pressure piston 30th trained pressure chamber with hydraulic pressure, so that the pressure piston 29 extend in the axial direction. This will make the sliding element 31 against the brake disc 1 and the brake disc element 5 pressed and they come into frictional contact with each other.

Reference symbol list

1

Brake disc

2nd

Braking system

3rd

first contact surface

4th

second contact surface

5

Brake disc element

6

Interior section

7

radial outside

8th

radial inside

9

Recess

10th

External teeth

11

Slat

12th

outer slat

13

inner slat

14

first opening

15

second opening

16

central section

17th

outer section

18th

inner section

19th

first inner slat

20th

Radial section

21st

Cross section

22

second inner slat

23

Radial section

24th

Cross section

25th

casing

26

first supporting part

27th

second supporting part

28

Actuator

29

Cylinder housing

30th

Pressure piston

31

Sliding element

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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

• DE 202004005284 U1 [0002]

Claims (4)

Brake disc (1) for a brake system (2) of a motor vehicle, with an axial first contact surface (3) and an axial second contact surface (4) opposite the first contact surface (3) in the axial direction, which is used for frictional connection with a brake disc element (5) are arranged and designed, and with an in the axial direction between the first contact surface (3) and the second contact surface (4) arranged inner section (6), characterized in that in the inner section (6) to a radial outside (7) and to one Radial inside (8) of the brake disc (1) open recesses (9) are formed for ventilation. Brake disc (1) after Claim 1 , characterized in that the brake disc (1) has at least two inner plates (13) designed as sheet metal components, the first openings (14) open to the radial outside (7) and / or second openings (15) open to the radial inside (8) ), the first openings (14) and the second openings (15) of the inner lamellae (13) arranged adjacent in the axial direction being so partially aligned with one another in the axial direction that they form the recesses (9). Brake disc (1) after Claim 2 , characterized in that the brake disc (1) has two outer plates (12) designed as a sheet metal component, each of which constitutes the first contact surface (3) or the second contact surface (4), the inner plates (13) being in the axial direction between the outer plates Slats (12) are arranged, and / or that the outer slats (12) and / or the inner slats (13) are designed as identical parts. Brake system (2) for a motor vehicle, with a housing (25), a first support part (26) connected to the housing (25) and a brake disc element (5) connected in a rotationally fixed manner to the first support part (27), and with one relative to the Housing (25) rotatably mounted second support part (27) and a rotatably connected to the second support part (27), arranged for frictional connection with the brake disc element (5) and designed brake disc (1) according to one of the preceding claims.

Images