Brake disc for a vehicle brake

Abstract

Internally ventilated brake disc for a disc brake, with two friction discs (5) arranged adjacent to one another and connected to one another by long webs (1, 2, 3), the spaces between which form cooling channels (6, 6', 6'', 6''a, 6''b) through which cooling air can flow, characterized in that radially extending long webs (2), with adjacent long webs (1, 3) running parallel to them, form a web group with at least three long webs (1, 2, 3) running parallel or substantially parallel to one another, and in that, over the circumference of the brake disc, between the individual web groups, in the respective V-shaped space which increases in size towards an outer circumference (8) of the friction disc (5), there is at least one radially extending short web (7) or at least one radially extending short fin.

Description

[0001] The invention relates to a brake disc, in particular for a motor vehicle brake, according to the preamble of the first claim.

[0002] Internally ventilated brake discs for disc brakes, in which several radially or curved webs of varying lengths define cooling channels between two axially spaced friction discs, are already known. The shape of the webs and their arrangement significantly determine the specific cooling air flow or the achievable cooling performance, as well as the required stiffness and strength of the brake disc.

[0003] This is described, among other things, in DE 43 23 782 C2, in which brake discs with radial or curved webs are shown.

[0004] Curved ribs provide good ventilation, but such brake discs are directional, meaning different brake discs must be manufactured for each side of the vehicle. Due to the variety of parts and the greater precision required for assembly, this leads to higher manufacturing costs.

[0005] DE 100 41 646 A1 proposes a brake disc for a motor vehicle, comprising two friction rings with friction surfaces and a ventilation channel between the friction rings, as well as ribs arranged in the ventilation channel. Circular or annular recesses are arranged between radially extending ribs on the friction rings in the area of ​​the ventilation channel.

[0006] With rib arrangements in which only long ribs run radially along the brake disc, the problem is that air cooling is reduced on the leeward side of the ribs due to the flow. Surface utilization is therefore not optimal.

[0007] Further brake disc systems are proposed in JP H08-61 403 A, US 2004 / 0 124 045 A1 and DE 10 2012 219 678 A1.

[0008] The object of the present invention is to provide a brake disc which does not have the above-mentioned disadvantages.

[0009] The problem is solved by the features of the first claim. A further embodiment of the invention is described in the dependent claim.

[0010] According to the invention, an internally ventilated brake disc for a disc brake, with two friction discs arranged adjacent to one another, which are connected to one another by long webs, the intermediate spaces of which form cooling channels through which cooling air can flow, is characterized in that radially extending long webs, with adjacent long webs running parallel to these, form a web group with at least three long webs running parallel or substantially parallel to one another, and in that, over the circumference of the brake disc, between the individual web groups, in the respective V-shaped intermediate space which increases in size towards an outer circumference of the friction disc, there is at least one radially extending short web or at least one radially extending short fin.

[0011] Such an arrangement of the fins or cooling channels allows for a larger number of fins and thus a higher fin density. A higher fin density increases the surface area and reduces the temperature difference. This prevents uneven temperatures in the tangential direction of the brake disc. Furthermore, flow separation on the leeward side of the fins can be reduced, thus increasing the surface area utilization of the airflow.

[0012] Furthermore, the brake disc can be installed in a vehicle regardless of the direction of rotation. This means that the same brake discs can be installed on both sides of the vehicle.

[0013] A preferred embodiment of the invention is characterized in that the web groups and short webs are arranged rotationally symmetrically.

[0014] According to the invention, a rotationally symmetrical cooling channel arrangement is proposed which enlarges the surface area for cooling a brake disc and thus increases the cooling performance. The cooling channel arrangement consists of three or more long, radially continuous webs. These are designed essentially parallel to one another, i.e. at a slight angle of less than 3 degrees, or as parallel air guide elements. Between each group of these long webs, at least one or more short webs or fins are arranged in the resulting conical gap. These can be inserted lengthwise or crosswise. The intermediate space or gap can be divided into two or more radial areas. The short webs or short fins do not project beyond the boundaries of the long webs in the radial direction. Furthermore, the short webs can end at different points in the radial direction.It should also be noted that, if the strength requirements are met, one or a pair of long fins can of course also be used instead of the long fins, for example alternating with the long fins.

[0015] According to the invention, the webs or fins run independently of the direction of rotation, which allows the brake disc to rotate both left and right.

[0016] The stepped arrangement of the short ribs allows for homogenization of the rib density, which leads to a reduction in the maximum temperature. The shape of the individual ribs can be a rounded rectangle, elliptical, stepped, convex, concave, or tapered inward / outward. Curving or bulging the ribs is also possible to optimize cooling performance when the brake disc is directional.

[0017] The webs parallel to the radial direction extend advantageously without any opening from near an outer peripheral edge to near an inner peripheral edge of the friction disc.

[0018] A preferred embodiment of the present invention of a brake disc is shown schematically in the accompanying drawing, limited to the essentials. The sole figure shows a partial cross-section of a brake disc according to the invention in the area of ​​the friction ring.

[0019] The figure shows, on the inside of a first friction disc 5, a web combination of webs 1, 2, 3, 7 of an internally ventilated brake disc for motor vehicles, which webs repeat geometrically regularly in the circumferential direction over its annular surface. The webs 1, 2, 3, 7 connect the first annular friction disc 5 to a second, axially adjacent friction disc (not visible in this cross-section). The two friction discs 5 of the brake disc are connected to one another via the webs 1, 2, 3, 7, which simultaneously delimit cooling channels 6, 6', 6'', 6''a, 6''b, which also repeat geometrically regularly in the circumferential direction over the annular surface of the friction disc 5. The cooling channels 6, 6', 6'', 6''a, 6''b each extend from the inner circumferential edge 4 to the outer circumferential edge 8 of the friction disc 5 of the brake disc.

[0020] What is not shown is that according to the prior art, the brake disc can ultimately be fixed via its inner peripheral edge 4 to a wheel flange of a wheel suspension of a motor vehicle, which is also not shown.

[0021] The friction discs 5 are connected by short webs 7 and long webs 1, 2, 3, each of the same length. Long webs 1, 2, 3 and short webs 7 extend straight from the outer peripheral edge 8 of the friction disc 5 towards its inner peripheral edge 4. The long webs 2 extend, as can be seen from the drawing, straight in the radial direction to the inner peripheral edge 4 of the friction disc 5. The long webs 1 and 3 also extend straight, parallel to the long webs 2 to the inner peripheral edge 4 of the friction disc 5. The short webs 7 end approximately in the middle of the friction disc 5. All webs 1, 2, 3, 7 have essentially the same web width.

[0022] The long webs 1, 2, 3, which run parallel to one another and run without any openings from near the outer circumferential edge 8 to near the inner circumferential edge 4 of the friction disc 5, create a truncated cone-shaped cooling channel 6'' between the web groups consisting of the long webs 1, 2, 3, which is formed by two adjacent long webs 3 and 1. In each of the truncated cone-shaped cooling channels 6'' there is then, viewed in the circumferential direction, a short web 7 in the center, which runs radially inwards without any openings from near the outer circumferential edge 8 of the friction disc 5. This short web partially divides the truncated cone-shaped cooling channel 6'' into two cooling channels 6''a and 6''b, which open into it approximately centrally between the inner 4 and outer circumferential edges 8.

Claims

[1] Internally ventilated brake disc for a disc brake, with two friction discs (5) arranged adjacent to one another, which are connected to one another by long webs (1, 2, 3), the spaces between which form cooling channels (6, 6', 6'', 6''a, 6''b) through which cooling air can flow, characterized by that radially extending long webs (2), with adjacent long webs (1, 3) running parallel to these, form a web group with at least three long webs (1, 2, 3) running parallel or substantially parallel to one another, and that, over the circumference of the brake disc, between the individual web groups, in the respective V-shaped intermediate space which increases in size towards an outer circumference (8) of the friction disc (5), there is at least one radially extending short web (7) or at least one radially extending short fin. [2] Brake disc according to claim 1, characterized by that the web groups and short webs (7) are arranged rotationally symmetrically.

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