DE-102025112923-A1 - Friction braking system for a motor vehicle

Abstract

The invention relates to a friction brake device (14) for a drive device (10) of a motor vehicle, comprising a first brake disc (42), a second brake disc (16), a lining disc (26) arranged between the brake discs (16, 42), and a housing (12), wherein the first brake disc (42) is fixedly connected to the housing (12) and its rear side rests flat against a corresponding wall of the housing (12), and wherein a diameter of the first brake disc (42) is larger or smaller than a diameter of the second brake disc (16).

Inventors

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

Assignees

• Mercedes-Benz Group AG

Dates

Publication Date

20260513

Application Date

20250402

Priority Date

20241108

Claims (4)

1. Friction brake device (14) for a drive device (10) of a motor vehicle, comprising a first brake disc (42), a second brake disc (16), a lining disc (26) arranged between the brake discs (16, 42), and a housing (12), wherein the first brake disc (42) is fixedly connected to the housing (12) and its rear side rests flat against a corresponding wall of the housing (12), and wherein a diameter of the first brake disc (42) is larger or smaller than a diameter of the second brake disc (16).
2. Friction brake device (14) according to Claim 1 , characterized in that the first brake disc (42) is firmly connected to the housing (12) via several screws on a circumference.
3. Friction brake device (14) according to Claim 1 or 2 characterized in that a space (68) in which at least the lining disc (26) is arranged is closed by an end cover (74) of the housing (12), the end cover (74) being screwed to the housing (12) by several screws on a circumference, wherein the first brake disc (42) and/or the second brake disc (16) is arranged axially between the end cover (74) and the housing (12), and wherein the screws are passed through the first brake disc (42) and/or the second brake disc (42).
4. Friction brake device (14) according to one of the preceding claims, characterized in that an outer diameter of the first brake disc (42) and/or the second brake disc (16) corresponds to an outer diameter of the housing (12).

Description

The invention relates to a friction brake device for a drive unit of a motor vehicle. The DE 10 2018 212 120 A1 An e-axis module is known to have at least one e-machine integrated into it. 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 expedient 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 device, or friction brake, for a drive unit of a motor vehicle, also referred to simply as a vehicle. In particular, the friction brake device is integrated into a housing assembly of the drive unit. The drive unit is, for example, an axle drive of the motor vehicle, which can be driven by means of the drive unit. When the braking device is mentioned before and below, unless otherwise specified, this refers to the friction brake device according to the invention. In particular, the friction brake device is or forms a service brake of the motor vehicle. The braking device has a housing, which is, for example, a component of the housing assembly. The braking device has a first brake disc, a second brake disc, and a pad disc arranged axially between the brake discs of the friction brake device, wherein, in particular, at least the pad disc and, for example, also the second brake disc can be arranged in the housing. The first brake disc is fixedly connected to the housing so that relative movements between the housing and the first brake disc are prevented. The first brake disc, with its rear side facing away from the pad disc and the second brake disc, rests at least substantially flush against the housing, i.e., against a corresponding wall of the housing formed as a solid body. The second brake disc is, for example, rotationally fixed to the housing, and preferably the second brake disc is axially displaceable relative to the housing. In other words, the second brake disc is preferably axially displaceable, i.e., in the axial direction of the friction brake assembly relative to the housing and preferably also relative to the first brake disc. The pad disc is rotatable about an axis of rotation relative to the housing assembly and relative to the brake discs, with the axial direction of the friction brake assembly, whose radial direction is perpendicular to the axis of rotation and thus perpendicular to the axial direction of the friction brake assembly, coinciding with the axis of rotation. "Axial" refers to the axial direction of the friction brake device, and "radial" refers to the radial direction of the brake device, whose circumferential direction extends around the axis of rotation and lies in an imaginary plane perpendicular to the axial direction of the friction brake device and thus perpendicular to the axis of rotation. Where the axial direction is mentioned before and below, this refers, unless otherwise specified, to the axial direction of the friction brake device. Where the radial direction is mentioned before and below, this refers, unless otherwise specified, to the radial direction of the friction brake device. In particular, it is conceivable that the brake pad disc is axially displaceable relative to the housing and relative to the first brake disc, and preferably also relative to the second brake disc. For example, the first brake disc has a first friction surface, and the second brake disc has a second friction surface. The pad disc has, for example, a third friction surface and a fourth friction surface. The first and third friction surfaces are opposite each other, with the third and first friction surfaces facing axially towards each other. The second and fourth friction surfaces are axially opposite each other and facing axially towards each other. By actuating the friction brake device, particularly hydraulically, the second brake disc can be moved axially relative to the housing and relative to the first brake disc, and preferably also relative to the pad disc, in particular translationally, such that the second brake disc, and thus the second friction surface, can be moved towards the fourth friction surface, and thus the pad disc. This allows the second and fourth friction surfaces to be brought into direct, mutual, and friction-fit contact, and the pad disc is axially movable relative to the housing and relative to the first brake disc such that the second friction surface, and thus the pad disc, can be moved towards the first friction surface, and thus the first brake disc. This also allows the first and second friction surfaces to be brought into direct, mutual friction-fit contact. Through the respective friction-fit and mutual contact between the first and second friction surfaces and between the third and fourth friction surfaces, the pad can The disc is braked with respect to a ro