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DE-102025112936-A1 - Friction braking system for a motor vehicle

DE102025112936A1DE 102025112936 A1DE102025112936 A1DE 102025112936A1DE-102025112936-A1

Abstract

The invention relates to a friction brake device (22) for a motor vehicle, comprising a housing (28), a friction disc (30) which is axially displaceable at least relative to the housing (28) and rotationally fixed to the housing (28), wherein at least two cooling cylinders (64) distributed around a circumference are integrally formed on an axial side (S1) of the friction disc (30) facing away from a braking surface (R1) of the friction disc (30), and these are arranged in openings (66) of a housing part (26) of the housing (28).

Inventors

  • Alexander von Gaisberg-Helfenberg
  • Jochen Haefner
  • Thomas Stolk

Assignees

  • Mercedes-Benz Group AG

Dates

Publication Date
20260513
Application Date
20250402
Priority Date
20241108

Claims (8)

  1. Friction brake device (22) for a motor vehicle, comprising a housing (28), comprising a friction disc (30) which is axially displaceable at least relative to the housing (28) and rotationally fixed to the housing (28), wherein at least two cooling cylinders (64) distributed around a circumference are integrally formed on the friction disc (30) on an axial side (S1) of the friction disc (30) facing away from a braking surface (R1) of the friction disc (30), which are arranged in openings (66) of a housing part (26) of the housing (28).
  2. Friction brake device (22) according to Claim 1 , characterized in that each cooling cylinder (64) has an annular groove (68) in which a respective sealing ring (70) is arranged.
  3. Friction brake device (22) according to Claim 2 , characterized in that the respective sealing ring (70) is designed in a disc shape.
  4. Friction brake device (22) according to Claim 2 , characterized in that the respective sealing ring (70) is designed as a four-round ring or as a quad ring.
  5. Friction disc brake device (22) according to Claim 1 , characterized in that each cooling cylinder (64) has a respective groove (68), wherein exactly one sealing ring (72) common to the cooling cylinders (64) is assigned to the cooling cylinders (64), which is arranged in the grooves (68).
  6. Friction brake device (22) according to Claim 5 , characterized in that the sealing ring (72) is designed as a four-round ring or as a quad ring.
  7. Friction brake device (22) according to Claim 5 , characterized in that the sealing ring (72) is designed in a disc shape.
  8. Friction brake device (22) according to one of the preceding claims, characterized in that the housing part (26) is designed as an end cover, wherein an actuating chamber (60) of a hydraulic actuating device (56) is arranged in the end cover (26), and wherein an actuating piston (54) for the friction disc (30) is arranged on an inner circumference of the end cover.

Description

The invention relates to a friction brake device for a motor vehicle. The state of the art includes the DE 34 19 241 C1 . The object of the present invention is to create a particularly advantageous friction braking device for a motor vehicle. This problem is solved by a friction braking device with the features of claim 1. Advantageous embodiments with appropriate further developments of the invention are specified in the remaining claims. The invention relates to a friction brake device, also referred to simply as a brake, braking system, or friction brake, for a motor vehicle, also referred to simply as a vehicle. In particular, the friction brake device is integrated into a housing assembly of the motor vehicle, especially an axle component of the motor vehicle. When the braking system is mentioned before and below, unless otherwise specified, this refers to the friction brake device according to the invention. For example, the axle component is an electric axle drive device, a differential gear (also referred to as a differential), or a chassis component such as an axle carrier. In particular, the friction brake device is or forms a service brake of the motor vehicle. The braking system has a housing, which may, for example, be part of the housing assembly. In particular, the friction brake device is, and in particular completely, surrounded by the housing assembly. The friction brake device has at least one friction disc, also referred to as a brake disc, or designed as a brake disc, which is axially displaceable relative to the housing and rotationally fixed to it. For example, the friction disc is at least partially arranged in the housing. It is conceivable that the friction brake device has at least one friction disc corresponding to the friction disc, which, for example, is rotatable about an axis of rotation relative to the housing and relative to the friction disc. The friction disc is also referred to as the first friction disc. Whenever the friction disc is mentioned before and after, this refers to the first friction disc unless otherwise specified. For example, the friction disc of the friction brake device, whose axial direction coincides with the axis of rotation, is axially displaceable, that is, in the axial direction of the friction brake device relative to the housing. The first friction disc is axially displaceable, that is, in the axial direction of the friction brake device and thus along the axis of rotation relative to the housing and, for example, also relative to the friction disc. Whenever the axial direction is mentioned before and after, this refers to the axial direction of the friction brake device unless otherwise specified. "Axial" refers to the axial direction of the friction brake device, whose radial direction is perpendicular to the axis of rotation and thus perpendicular to the axial direction. The term "radial" refers to the radial direction of the friction braking device. Whenever the radial direction is mentioned before or below, it refers, unless otherwise specified, to the radial direction of the friction braking device. For example, the friction disc has a first friction surface. The lining disc has, for example, a second friction surface. For example, the first friction surface and the second friction surface face each other, particularly in the axial direction. By actuating the brake device, particularly hydraulically, the friction disc can be displaced axially relative to the housing and, for example, also relative to the lining disc, such that the friction disc and the lining disc, and thus the first friction surface and the second friction surface, can be moved axially towards each other, thereby bringing the first friction surface and the second friction surface into mutual, particularly direct, frictional contact, which is also referred to as friction contact. This allows, for example, the lining disc to be braked with respect to a rotation about the axis of rotation and relative to the housing and relative to the friction disc, thus at least slowing it down, thereby braking, for example, a wheel of the motor vehicle and thus the motor vehicle as a whole. The aforementioned vehicle wheel, also simply referred to as a wheel, is a ground contact element by which the vehicle can be supported and stabilized against the ground in the vehicle's upward direction. It is conceivable that the friction disc is connected to the vehicle wheel in a torque-transmitting, and in particular rotationally fixed, manner. The vehicle wheel is rotatable about a wheel axis relative to the housing. Thus, for example, when the vehicle wheel rotates about its wheel axis relative to the housing, the friction disc can rotate with the vehicle wheel and is therefore rotatable about its axis relative to the housing and relative to the friction disc. By actuating the braking system, particularly hydraulically, the vehicle wheel can be rotated about its wheel axis. The rotation relative