DE-102025112939-A1 - Axle drive device for a motor vehicle, in particular for a motor car

Abstract

The invention relates to an axle drive device (10) for a motor vehicle, comprising at least one integrated friction brake device (14) arranged in an interior space (68) of an intermediate cover (62) closing a transmission compartment (70), an output shaft (24), and an end cover (74) arranged coaxially to the output shaft (24) rotatable relative to the end cover (74) and closing the interior space (68) of the intermediate cover (62), and an actuating piston (34) which can be supplied with hydraulic fluid for hydraulic actuation of the friction brake device (14) and directly delimits an actuating chamber (52) provided in the end cover (74), into which the hydraulic fluid can be introduced for supplying the actuating piston (34), wherein the end cover (74) has a plate-shaped section (TS) in which a supply channel (50) is provided as the first channel and a vent channel as the second channel. are.

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 (5)

1. Axle drive device (10) for a motor vehicle, comprising at least one integrated friction brake device (14) arranged in an interior space (68) of an intermediate cover (62) closing a transmission compartment (70), comprising an output shaft (24), and an end cover (74) arranged coaxially to the output shaft (24) rotatable relative to the end cover (74) and closing the interior space (68) of the intermediate cover (62), and comprising an actuating piston (34) which can be supplied with hydraulic fluid for hydraulic actuation of the friction brake device (14) and directly delimits an actuating chamber (52) provided in the end cover (74), into which hydraulic fluid can be introduced for actuating the actuating piston (34), wherein: - the end cover (74) has a disc-shaped section (TS) in which a supply channel (50) is provided as the first channel and a vent channel as the second channel. are; and - both channels (50) each have a radially directed end section and each have an opening on an outer circumference of the end cap (74).
2. Axle drive unit (10) according Claim 1 , characterized in that the end cover (74) has stiffening ribs, namely first stiffening ribs arranged in angular regions of the vent channel and the supply channel (50) and second stiffening ribs arranged outside the angular regions of the vent channel and the supply channel (50), wherein the first stiffening ribs are at least twice as wide as the other, second stiffening ribs.
3. Axle drive unit (10) according Claim 1 or 2 characterized in that a venting device is incorporated into the opening of the venting channel.
4. Axle drive unit (10) according Claim 3 , characterized in that the opening of the vent channel and the venting device are arranged in an upper area in the installation position of the axle drive device (10) in the vehicle's vertical direction, wherein the opening of the supply channel (50) is located in an area of 5 o'clock or 7 o'clock and/or in a lower area in the installation position of the axle drive device (10) in the vehicle's vertical direction.
5. Axle drive device according to one of the preceding claims, characterized in that the supply channel (50) and the vent channel are each formed from two intersecting bores in the end cover (74) from different sides.

Description

The invention relates to an axle drive device for a motor vehicle, in particular for a motor car. The DE 10 2019 100 738 B3 An electric axle drive unit for a motor vehicle is known to exist, 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 provide a particularly advantageous axle drive device for a motor vehicle. This object is achieved by an axle drive 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 an axle drive device for a motor vehicle, also referred to simply as a vehicle. This means that the motor vehicle, preferably designed as a motor vehicle, 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. The axle drive device has an integrated friction brake device, which is also simply referred to as a brake device. The friction brake device is arranged in an interior space of an intermediate cover that closes off a transmission compartment of the axle drive device. For example, the axle drive device has a housing, which, for example, comprises a first housing part and a second housing part. For example, the intermediate cover is the second housing part. The first housing part and the second housing part are, for example, designed separately from one another and are connected to each other at least indirectly, in particular directly. For example, the transmission compartment is bounded, in particular directly, by the first housing part, in particular by an inner circumferential surface of the first housing part. For example, a transmission is arranged in the transmission compartment, which can, for example, be designed as a differential transmission. The axle drive assembly also includes an output shaft, which is also simply referred to as a shaft. The output shaft is rotatable about an output shaft axis relative to the housing. This means that at least part of the output shaft is rotatable about the output shaft axis relative to the housing. The output shaft is driveable and therefore rotatable about the output shaft axis relative to the housing. For example, the output shaft can be driven via the transmission. The axle drive assembly includes, for example, a drive motor by means of which the output shaft can be driven, particularly via the transmission. The drive motor is, for example, an electric motor. Considering only the first housing part, the first housing part has a first through-opening that opens, for example, at one end into the transmission compartment and at the other end into the surrounding area of the first housing part. The intermediate cover closes off the first through-opening and thus the transmission compartment, at least partially, particularly towards the surrounding area. The interior of the intermediate cover is, for example, bounded by the intermediate cover, in particular by an inner circumferential surface of the intermediate cover, and especially directly bounded. The friction brake device is arranged in this interior. Thus, for example, the friction brake device is arranged radially within the intermediate cover and axially overlapping the intermediate cover. The friction brake device is, for example, designed as a disc brake, and thus as a disc brake device. 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 a ground contact element of the motor vehicle. The vehicle wheel is rotatable about a wheel axis relative to the housing of the axle drive device. For example, the output shaft can be coupled to the vehicle wheel in a torque-transmitting manner, or is coupled to it, so that by driving the output shaft, the vehicle wheel can be driven by means of the output shaft and is thereby rotatable about the wheel axis relative to the housing. In particular, the output shaft is permanently coupled to the vehicle wheel in a torque-transmitting manner. The friction brake device can, for example, brake the output shaft with respect to rotations around the output shaft's axis of rotation and relative to the housing, thereby braking the vehicle wheel with respect to rotations around the wheel's axis of rotation and relative to the housing. This allows the vehicle as a whole to be braked. The friction brake device is, or constitutes, a friction brake by means of which the output shaft, and thus, for example, the vehicle wheel, can be braked by friction. In particular, the friction brake device is, or constitutes, a service brake of the vehicle. In particular, the friction brake device is integrated into, especially into, the axle drive device in such a way