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DE-102025112932-A1 - Dry-running friction disc brake system for a motor vehicle

DE102025112932A1DE 102025112932 A1DE102025112932 A1DE 102025112932A1DE-102025112932-A1

Abstract

The invention relates to a dry-running friction disc brake device (14) for a motor vehicle, comprising at least one first brake disc element (16) having at least one first friction surface (18), at least one second brake disc element (20) having at least one second friction surface (22), a pad disc element arranged between the brake disc elements (16, 20), a piston (34) designed as an annular piston which can be pressurized with hydraulic fluid and thereby hydraulically actuated, and an annular transmission element (54) arranged between the piston (34) and the first brake disc element (16), which has an axially directed projection (84) on its inner circumference, wherein the transmission element (54) and the first brake disc element (16) can be actuated by means of the piston (34) by hydraulic actuation of the piston (34), thereby causing the friction surfaces (18, 22) to flex in order to effect braking. can be brought into frictional contact with the coating disc element.

Inventors

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

Assignees

  • Mercedes-Benz Group AG

Dates

Publication Date
20260513
Application Date
20250402
Priority Date
20241108

Claims (6)

  1. Dry-running friction disc brake device (14) for a motor vehicle, comprising at least one first brake disc element (16) having at least one first friction surface (18), at least one second brake disc element (20) having at least one second friction surface (22), a pad disc element (17) arranged between the brake disc elements (16, 20), a piston (34) designed as an annular piston which can be pressurized with hydraulic fluid and thereby hydraulically actuated, and an annular transmission element (54) arranged between the piston (34) and the first brake disc element (16), which has an axially directed projection (84) on its inner circumference, wherein: - the transmission element (54) and the first brake disc element (16) can be actuated by means of the piston (34) by hydraulic actuation of the piston (34), thereby causing braking by pressing the friction surfaces (18, 22) in are able to be brought into frictional contact with the pad element, - the projection (84) is operatively connected to the piston (34) via an outer surface of the projection (84); and - the axial extent of the transmission element (54) increases from radially outside to radially inside on a side facing away from the first brake disc element (16).
  2. Friction disc brake device (14) according to Claim 1 , characterized in that the projection (84) has a groove (78) arranged on an outer circumference of the projection (84) in which an O-ring (82) is arranged, wherein the piston (34) radially surrounds the projection (84), wherein the piston (34) has a locking groove (80) on its inner circumferential surface, and wherein the transmission element (54) is connected to the piston (34) via the O-ring (82) arranged in the grooves (78, 80).
  3. Friction disc brake device (14) according to Claim 1 or 2 , characterized in that an outer diameter of the outer circumference of the projection (84) is smaller in each axial region than an inner circumference diameter of the piston (34).
  4. Friction disc brake device (14) according to one of the preceding claims, characterized in that the piston (34) has a chamfer (F) on the inner circumferential surface at a head side.
  5. Friction disc brake device (14) according to one of the preceding claims, characterized in that the transmission element (54) has a chamfer (94) on the outer circumference of the projection (84).
  6. Friction disc brake device (14) according to one of the preceding claims, characterized in that the transmission element (54) is connected to the first brake disc element (16) via a cooling structure (56) provided on a rear side (R) of the first brake disc element (16).

Description

The invention relates to a dry-running friction disc brake device for a motor vehicle. The DE 10 2019 118 503 A1 discloses a braking device for a wheel hub drive assembly. The object of the present invention is to create a particularly advantageous, dry-running friction disc brake device for a motor vehicle. This problem is solved by a friction disc brake device with the features of claim 1. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims. The invention relates to a dry-running friction disc brake system, in particular integrated into an axle component of a motor vehicle, for a motor vehicle simply referred to as a vehicle. The friction disc brake system is also simply referred to as a brake or brake system and comprises at least one first brake disc element, which has at least one first friction surface. The friction disc brake system also comprises at least one second brake disc element, which has at least one second friction surface. The brake disc elements are also simply referred to as friction elements or brake elements. The friction disc brake system also comprises a piston, which can be actuated, in particular directly, with a hydraulic fluid and thereby hydraulically actuated. This piston is also referred to as an actuating piston and is designed as an annular piston. An annular transmission element is provided, which is preferably designed separately from the first brake disc element and separately from the piston. Preferably, the first brake disc element is a brake disc. Preferably, the second brake disc element is also a brake disc. The transmission element is arranged at least partially between the piston and the first brake disc element, in particular in the axial direction of the friction disc brake system. The brake disc elements are rotatable relative to each other about an axis of rotation. The transmission element has an axial projection on its inner circumference, that is, a projection directed in the axial direction of the friction disc brake assembly. The axial direction of the friction disc brake assembly, whose radial direction is perpendicular to the axial direction of the friction disc brake assembly, coincides with the axis of rotation, so that the radial direction is perpendicular to the axis of rotation. The piston, by means of hydraulic actuation, actuates the transmission element and, via the transmission element, the first brake disc element. This allows the friction surfaces to be brought into frictional contact, particularly direct contact, with a pad element arranged axially between the brake disc elements, thus effecting braking. Braking, in this context, means that during or through braking, the pad element can be slowed down by means of frictional contact with the two brake disc elements. Furthermore, according to the invention, the projection is operatively connected to the piston via an outer surface of the projection, wherein an axial extension of the transmission element, i.e. in the axial direction of the friction disc brake device, increases from radially outside to radially inside when viewed on a side facing away from the first brake disc element, in particular axially. The motor vehicle, also referred to simply as a vehicle, in its fully manufactured state comprises a friction disc brake assembly, which can be referred to simply as a brake. For example, the motor vehicle in its fully manufactured state has at least one vehicle wheel, which is a ground contact element of the motor vehicle. The vehicle wheel is rotatable about a wheel axis relative to a reference element of the motor vehicle, in particular the two brake disc elements of the friction disc brake assembly. For example, the vehicle wheel can be braked, in particular slowed down, with respect to rotations about the wheel axis and relative to the reference element by means of the friction disc brake assembly, thereby, for example, braking the motor vehicle as a whole. The friction disc brake assembly is or forms a friction brake by means of which, for example, the vehicle wheel can be braked by friction. In particular, the friction disc brake assembly is or forms a service brake of the motor vehicle. The pad element is rotatable with the vehicle wheel when it rotates around the wheel axis relative to the reference element, and thus can rotate around the axis of rotation relative to the brake disc elements. For this purpose, the pad element is, for example, torque-transmitting, and in particular rotationally fixed, to the vehicle wheel. pelbar or coupled. By braking or decelerating the pad disc element, particularly relative to the brake disc elements, the vehicle wheel can be braked, i.e., slowed down, especially with regard to its rotations around the wheel axis and relative to the reference element. In an advantageous embodiment of the invention, it is provided that the projection has a groove arranged on an outer circumference of th