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DE-102025112925-A1 - Axle drive device for a motor vehicle as well as motor vehicle

DE102025112925A1DE 102025112925 A1DE102025112925 A1DE 102025112925A1DE-102025112925-A1

Abstract

The invention relates to an axle drive device (10) for a motor vehicle, with at least one integrated friction brake device (14), which is arranged in an inner area (68) of a cover (62) closing a drive compartment (70) and has at least one brake disc (16, 42) which has a first splined connection (47) on its outer circumference (AU1) which engages in a corresponding second splined connection (48) provided on an inner circumferential side (I) of the cover (62), whereby the brake disc (16, 42) is connected to the cover (62) in a rotationally fixed manner.

Inventors

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

Assignees

  • Mercedes-Benz Group AG

Dates

Publication Date
20260513
Application Date
20250402
Priority Date
20241108

Claims (7)

  1. Axle drive device (10) for a motor vehicle, with at least one integrated friction brake device (14) which is arranged in an inner area (68) of a cover (62) closing a drive compartment (70) and has at least one brake disc (16, 42) which has a first splined connection (47) on its outer circumference (AU1) which engages in a corresponding second splined connection (48) provided on an inner circumferential side (I) of the cover (62), whereby the brake disc (16, 42) is connected to the cover (62) in a rotationally fixed manner.
  2. Axle drive unit (10) according Claim 1 , characterized in that the friction brake device (16) has at least one brake disc (16, 42) as the first brake disc (16), a second brake disc (42) and a pad disc (20) arranged between the brake discs (16, 42), wherein the second brake disc (42) is axially fixed to the cover (62).
  3. Axle drive unit (10) according Claim 2 , characterized in that a cooling plate is integrated into the second brake disc (42) on a side (R2) facing away axially from the first brake disc (16) and the pad disc (20).
  4. Axle drive unit (10) according Claim 3 , characterized in that the cooling plate has a contact surface extending in a radial direction with the lid (62).
  5. Axle drive unit (10) according to one of the Claims 2 until 4 , characterized in that the first brake disc (16) is arranged axially displaceable in the cover (62) and is axially displaceable by a hydraulically actuated actuating element (34) arranged in a final cover (74).
  6. Axle drive device (10) according to one of the preceding claims, characterized in that the cover (62) forms a counter plate of the friction brake device (14).
  7. Motor vehicle, with an axle drive device (10) according to one of the preceding claims.

Description

The invention relates to an axle drive device for a motor vehicle, in particular for a car. Furthermore, the invention relates to a motor vehicle with at least one such axle drive device. The DE 10 2019 100 738 B3 Disclosing an electric axle drive unit for a motor vehicle, comprising an electric motor, wherein a stator of the electric motor is fixedly mounted in a housing and a rotor of the electric motor, rotatably mounted relative to the stator, is rotaryally coupled or rotatably coupled to a wheel hub. The object of the present invention is to create an axle drive device for a motor vehicle and a motor vehicle with at least one such axle drive device, so that a particularly advantageous braking system can be implemented in a particularly space-saving manner. This problem is solved by an axle drive device with the features of claim 1 and by a motor vehicle with the features of claim 7. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims. A first aspect of the invention relates to an axle drive device for a motor vehicle, also simply referred to as a vehicle. This means that the motor vehicle, preferably designed as a motor car, in particular as a passenger car, in its fully manufactured state, has the axle drive device and can be driven by means of the axle drive device, in particular electrically and, most especially, purely electrically. For example, the motor vehicle in its fully manufactured state has at least or exactly two axles arranged consecutively and thus one behind the other in the longitudinal direction of the motor vehicle, namely a first axle and a second axle. Each axle is also simply referred to as an axle and has at least or exactly two wheels. The wheels of each axle are also referred to as wheels. The wheels of each axle are arranged on opposite sides of the motor vehicle in the transverse direction. The wheels are ground contact elements by means of which the motor vehicle can be supported or is supported downwards against a ground. When a motor vehicle is driven along the ground while supported downwards by ground contact elements in the vehicle's vertical direction, these elements roll along the ground, particularly directly. The axle drive system can, for example, drive at least one or exactly one of the vehicle wheels on one of the vehicle axles. In particular, it is conceivable that the axle drive system can drive the vehicle wheels of the same axle, especially simultaneously. The vehicle wheel, or in particular each wheel, that can be driven by the axle drive system is also simply referred to as the drive wheel. For example, the axle drive system has a drive motor by which the vehicle wheel can be driven, in particular via an output shaft of the axle drive system. This means that the drive motor can drive the output shaft, and by driving the output shaft, the drive wheel can be driven. For example, the axle drive assembly has a housing, also referred to as a housing assembly, wherein the output shaft is rotatable about an output shaft axis of rotation relative to the housing assembly. Thus, for example, the drive motor can drive the output shaft, also simply referred to as the shaft, and thereby rotate it about the output shaft axis of rotation relative to the housing. By driving the output shaft, the drive wheel can be driven by means of the output shaft and thereby rotated about a wheel axis of rotation relative to the housing. It is conceivable that the wheel axis of rotation coincides with the axis of rotation. Furthermore, it is conceivable that the wheel axis of rotation is inclined to the axis of rotation, or that the wheel axis of rotation is parallel to the wheel axis of rotation and spaced apart from the axis of rotation. The characteristic that the output shaft is rotatable about its axis of rotation relative to the housing means that at least a portion of the output shaft is rotatable about its axis of rotation relative to the housing. This portion of the output shaft could, for example, be a first shaft section, which might include a second shaft section and a joint, also known simply as a universal joint. The shaft sections are articulated together via the universal joint. The axle drive unit has at least one integrated friction brake unit, i.e., one integrated into the axle drive unit. The friction brake unit is referred to as a brake unit, brake, or friction brake. In the case of For example, the friction brake system is or forms a service brake of the motor vehicle. Through friction braking, the output shaft can be slowed down by friction as it rotates around its axis of rotation relative to the housing. This, in turn, slows down the rotation of the vehicle wheel around its axis of rotation relative to the housing. In this way, the entire motor vehicle can be braked. For this purpose, the friction brake device has at least one brake disc, which is also referred to as the first brake disc. When the b