DE-102025112929-A1 - Braking system for a motor vehicle

Abstract

The invention relates to a braking device (14) for a motor vehicle, comprising a housing (62, 74) and a friction disc (20) arranged axially between a first counter-rotating disc (42) and a second counter-rotating disc (16) of the braking device (14), wherein the friction disc (20) is axially displaceable relative to the housing (62, 74) and relative to the counter-rotating discs (42, 16). The first counter-rotating disc (42) is rotationally fixed and axially fixed to the housing (62, 74). The second counter-rotating disc (16) is rotationally fixed to the housing (62, 74) and axially displaceable relative to the housing (62, 74), relative to the friction disc (20), and relative to the first counter-rotating disc (42). On a side (R) of the second counter-rotating disc (16) facing away axially from the friction disc (20) a housing cover (74) is arranged, through which at least two bolts (88) are passed.

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 (4)

1. A braking device (14) for a motor vehicle, comprising a housing (62, 74) and a friction disc (20) arranged axially between a first counter-rotating disc (42) and a second counter-rotating disc (16) of the braking device (14), wherein: - the friction disc (20) is axially displaceable relative to the housing (62, 74) and relative to the counter-rotating discs (42, 16); - the first counter-rotating disc (42) is rotationally fixed and axially fixed to the housing (62, 74); - the second counter-rotating disc (16) is rotationally fixed to the housing (62, 74) and axially displaceable relative to the housing (62, 74), relative to the friction disc (20), and relative to the first counter-rotating disc (42); - a housing cover (74) is arranged on a side (R) of the second counter-rotating disc (16) facing away axially from the friction disc (20), through which at least two bolts (88) are passed, which are axially fixed to the second counter-rotating disc (16); - a nut (90) is screwed axially onto each bolt (88) on an outer surface (AS) of the housing cover (74); and - a return spring (82) is arranged on each nut (90).
2. Braking device (14) after Claim 1 , characterized in that on the side (R) of the second counter-rotating disc (16) facing away axially from the friction disc (20) a cooling chamber (102) through which a coolant can flow is arranged between the housing cover (74) and the second counter-rotating disc (16), wherein the respective bolt (88) is designed to be hollow inside and thereby has a respective cavity (98) which is fluidically connected to the cooling chamber (102).
3. Braking device (14) after Claim 1 or 2 , characterized in that the respective return spring (92) is designed as a disc spring.
4. Brake device (14) according to one of the preceding claims, characterized in that the respective return spring (92) is in contact with the respective nut (92) on one side and with the housing cover (74) on the other, both in the actuated state and in the unactuated state of the brake device (14).

Description

The invention relates to a braking device for a motor vehicle. The DE 10 2022 113 216 A1 A braking device for a vehicle with two reset devices is known. The object of the present invention is to create a particularly advantageous braking device for a motor vehicle. This problem is solved by a 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 braking device, also referred to simply as a brake, for a motor vehicle, also referred to simply as a vehicle. In particular, the braking device is integrated into a housing of the motor vehicle, especially an axle drive unit of the motor vehicle. The braking device comprises a housing assembly, which is, for example, part of the housing. The braking device includes a friction disc, which is arranged axially between a first counter-rotating disc of the braking device and a second counter-rotating disc of the braking device. The friction disc is axially displaceable relative to the housing assembly and relative to the counter-rotating discs. For example, the friction disc is rotatable about an axis of rotation relative to the counter-rotating discs and relative to the housing assembly of the braking device, its axial direction coinciding with that of the axis of rotation. "Axial" refers to the axial direction of the braking device, the radial direction of which is perpendicular to the axial direction and thus perpendicular to the axis of rotation. "Radial" refers to the radial direction. The first counter-rotating disc is fixedly connected to the housing assembly and is therefore not rotatable about the axis of rotation relative to the housing assembly. Furthermore, the first counter-rotating disc is axially fixed to the housing assembly and therefore cannot be moved axially relative to the housing assembly. The second counter-rotating disc is rotationally fixed to the housing assembly and therefore cannot be rotated about the axis of rotation relative to the housing assembly. Furthermore, the second counter-rotating disc is axially displaceable relative to the housing assembly, relative to the friction disc, and relative to the first counter-rotating disc. The friction disc has, for example, a first friction surface and a second friction surface. The first counter-rotating disc has, for example, a third friction surface. The second counter-rotating disc has, for example, a fourth friction surface. For example, the first friction surface and the third friction surface face each other axially, and, for example, the second friction surface and the fourth friction surface face each other axially. For example, the second counter-rotating disc can be actuated, particularly hydraulically, by actuating the braking device, and thereby moved axially onto the friction disc and the first counter-rotating disc, allowing, for example, the first friction surface to be brought into mutual and, in particular, direct frictional contact with the third friction surface and the second friction surface with the fourth friction surface. This allows, for example, the friction disc to be braked with respect to a rotation about the axis of rotation and relative to the housing assembly and relative to the counter-rotating discs, thereby allowing, for example, the entire motor vehicle to be braked. For example, the motor vehicle in its fully manufactured state has at least one vehicle wheel, also simply referred to as a wheel, which is, for example, a ground contact element by means of which the motor vehicle can be supported or is supported downwards against a ground in the vehicle's vertical direction. It is conceivable that the friction disc is connected to the wheel in a torque-transmitting, and in particular rotationally fixed, manner. The vehicle wheel is rotatable about a wheel axis relative to the housing assembly. Thus, for example, when the vehicle wheel rotates around its axis of rotation relative to the housing, the friction disc rotates with the vehicle wheel and is therefore rotatable around its axis of rotation relative to the counter-rotating discs or relative to the housing. By actuating the brake, the friction disc can be used to brake the vehicle wheel with respect to its rotation around its axis of rotation relative to the housing, i.e., to slow it down, thereby at least slowing down the vehicle as a whole. On a side of the second counter-rotating disc facing away from the friction disc, a housing cover is arranged, which can also be called an end cover and can be designed as such. At least two bolts pass through the housing cover, with each bolt being axially fixed to the second counter-rotating disc and thus axially movable with the second counter-rotating disc relative to the housing assembly, relative to the friction disc, and relative to the first counter-rotating disc. A nut is screwed onto each bolt axially, specifically onto an outer