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DE-102025112928-A1 - Axle drive device for a motor vehicle as well as motor vehicle

DE102025112928A1DE 102025112928 A1DE102025112928 A1DE 102025112928A1DE-102025112928-A1

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) with an outer circumferential conical ring shape at least in a partial area, which is arranged coaxially to the output shaft (24) rotatable relative to the end cover (74), extends along the output shaft (24) and closes the interior space (68) of the intermediate cover (62), and an actuating piston (34) which can be actuated with hydraulic fluid for hydraulic actuation of the friction brake device (14) and is thereby movable in a direction of movement, and directly defines an actuating chamber (52) into which the hydraulic fluid can be introduced for actuating the actuating piston (34), wherein the actuating chamber (52) and the actuating piston (34) are arranged on an inner circumference of the end cover (74). The actuating piston (34) is designed as an annular piston whose direction of movement is in the axial direction of the output shaft (24).

Inventors

  • Alexander von Gaisberg-Helfenberg
  • Jochen Haefner
  • Thomas Stolk
  • Cecile Jecker

Assignees

  • Mercedes-Benz Group AG

Dates

Publication Date
20260513
Application Date
20250402
Priority Date
20241108

Claims (6)

  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) with an outer circumferential conical ring shape at least in a partial area, which is arranged coaxially to the output shaft (24) rotatable relative to the end cover (74), extends along the output shaft (24) and closes the interior space (68) of the intermediate cover (62), and comprising an actuating piston (34) which can be actuated with hydraulic fluid for hydraulic actuation of the friction brake device (14) and is thereby movable in a direction of movement, and directly defines an actuating chamber (52) into which the hydraulic fluid can be introduced for actuating the actuating piston (34), wherein: - the actuating chamber (52) and the actuating piston (34) are arranged on an inner circumference of the end cover (74); and - the actuating piston (34) is designed as a ring piston whose direction of movement is in the axial direction of the output shaft (24).
  2. Axle drive unit (10) according Claim 1 , characterized in that the output shaft (24) has a tripod joint (40).
  3. Axle drive unit (10) according Claim 2 , characterized in that the tripod joint (40) is surrounded by the end cover (74) in the circumferential direction of the output shaft (24), such that a central axis of the end cover (74) coincides with a central axis of the output shaft (24).
  4. Axle drive unit (10) according Claim 2 or 3 , characterized in that a sealing element (90) is provided which is arranged in the radial direction of the output shaft (24) between a sleeve (92) which is rotatable with the output shaft (24) relative to the end cover (74) and which surrounds the tripod joint (40) in the circumferential direction of the output shaft (24) and the end cover (74), so that the end cover (74) is sealed against the sleeve (90) by means of the sealing element (90).
  5. Axle drive device (10) according to one of the preceding claims, characterized in that the actuating piston (34) has a step (94) which forms an effective surface (96) of the actuating piston (34).
  6. 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 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 create an axle drive device for a motor vehicle and a motor vehicle with at least one such axle drive device, so that the motor vehicle can be braked 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 6. 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 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 at least one integrated friction brake device, which can, for example, be designed as a disc brake device, i.e., as a disc brake. The friction brake device is arranged in an interior space of an intermediate cover that closes off a transmission compartment. The axle drive device has, for example, a housing comprising a first housing part and a second housing part. For example, the first housing part and the second housing part are designed separately from one another and are connected to each other at least indirectly, in particular directly, in such a way that relative movements between the first housing part and the second housing part are prevented. The transmission compartment is, for example, bounded by the first housing part, in particular by an inner circumferential surface of the first housing part, in particular directly bounded. The intermediate cover is, for example, the second housing part. When considering only the first housing part, the first housing part has a first through-opening which, for example, opens at one end into the gearbox compartment and at the other end into the surrounding area of the first housing part. The first through-opening, and thus the gearbox compartment, is at least partially, and in particular at least predominantly, and thus at least more than halfway, closed off by the intermediate cover, especially towards the surrounding area. The feature that the friction brake device is arranged in the interior of the intermediate cover means, in particular, that the friction brake device is arranged radially within the intermediate cover and axially overlapping it. The interior is bounded, for example, by the intermediate cover, in particular by an inner circumferential surface of the intermediate cover, and in particular directly bounded, especially in the radial direction of the axle drive device towards the outside. The axle drive unit also has an output shaft which is rotatable about an output shaft axis relative to the intermediate cover and also relative to the first housing part. This means, in particular, that at least a portion of the output shaft, whose axial direction coincides with the output shaft axis, is rotatable about the output shaft axis relative to the first housing part and relative to the intermediate cover. For example, a gearbox of the axle drive unit is arranged in the gearbox compartment, the axial direction of which coincides with the output shaft axis and thus with the axial direction of the output shaft. For example, the output shaft can be driven via the gearbox and is therefore rotatable about the output shaft axis relative to the first housing part and relative to the intermediate cover (second housing part). The axle drive assembly, whose radial direction is perpendicular to the output shaft's axis of rotation and thus perpendicular to the axial direction of the axle drive assembly, also has an end cover. For example, the end cover is a third housing part of the housing and thus also a sub-housing. The end cover is connected, for example, at least indirectly to the intermediate cover and to the first housing part, in particular in such a way that relative movements between the end cover and the intermediate cover and relative movements between the end cover and the first housing part are prevented. The intermediate cover and the end cover are also simply referred to as The inner cover is also called the side cover. For example, a motor vehicle in its fully manufactured state has at least one wheel, also simply referred to as a wheel. The wheel is a ground contact element by which the motor vehicle can be