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DE-102025112945-A1 - Integrated drive unit for a vehicle

DE102025112945A1DE 102025112945 A1DE102025112945 A1DE 102025112945A1DE-102025112945-A1

Abstract

The invention relates to an integrated drive unit (1) for a vehicle with a drive housing (2), wherein an electric machine (3) for generating a drive torque for the vehicle, a transmission unit (4) with at least one gear stage, and a differential unit (5) for outputting a translated drive torque to a first side shaft (6a) and a first wheel (7a) and to a second side shaft (6b) and a second wheel (7b) of a drive axle (8) of the vehicle are integrated into the drive housing (2), wherein the electric machine (3) is arranged coaxially to the drive axle (8), and wherein a first auxiliary housing (9a) is attached to the drive housing (2) on a first axial side of the drive housing (2), with a first braking device (10a) integrated in the first auxiliary housing (9a) and arranged coaxially to the electric machine (3) for generating a braking torque on the first wheel (7a), and a second auxiliary housing (9b) is attached to the drive housing on a second axial side of the drive housing (2). (2) is attached, with a second braking device (10b) integrated in the second auxiliary housing (9b) and arranged coaxially to the electric machine (3) for generating a braking torque on the second wheel (7b), and wherein the first braking device (10a) comprises exactly one first friction lining disc (11a) axially displaceable and rotationally fixed to the first side shaft (6a) and provided with a friction lining on both sides, which is arranged axially between two first friction-free counter-rotating discs (12a, 13a), and the second braking device (10b) comprises exactly one second friction lining disc (11b) axially displaceable and rotationally fixed to the second side shaft (6b) and provided with a friction lining on both sides, which is arranged axially between two second friction-free counter-rotating discs (12b, 13b), wherein one of the friction-free counter-rotating discs (12a, 12b) is fixedly connected to the drive housing (2), and the other friction-free The counter-rotating disc (13a, 13b) is connected to the respective first or second auxiliary housing (9a, 9b) in a rotationally fixed and axially displaceable manner.

Inventors

  • Alexander von Gaisberg-Helfenberg
  • Francesco Johannes Ventriglio
  • Jochen Haefner
  • Thomas Stolk

Assignees

  • Mercedes-Benz Group AG

Dates

Publication Date
20260513
Application Date
20250402
Priority Date
20241108

Claims (6)

  1. Integrated drive unit (1) for a vehicle with a drive housing (2), wherein an electric machine (3) for generating a drive torque for the vehicle, a transmission unit (4) with at least one gear stage, and a differential unit (5) for outputting a translated drive torque to a first side shaft (6a) and a first wheel (7a) and to a second side shaft (6b) and a second wheel (7b) of a drive axle (8) of the vehicle are integrated into the drive housing (2), wherein the electric machine (3) is arranged coaxially to the drive axle (8), and wherein a first auxiliary housing (9a) is attached to the drive housing (2) on a first axial side of the drive housing (2), with a first braking device (10a) integrated in the first auxiliary housing (9a) and arranged coaxially to the electric machine (3) for generating a braking torque on the first wheel (7a), and a second auxiliary housing (9b) is attached to the drive housing (2) on a second axial side of the drive housing (2). is, with a second braking device (10b) integrated in the second auxiliary housing (9b) and arranged coaxially to the electric machine (3) for generating a braking torque on the second wheel (7b), and wherein the first braking device (10a) comprises exactly one first friction lining disc (11a) axially displaceable and rotationally fixed to the first side shaft (6a) and provided with a friction lining on both sides, which is arranged axially between two first friction-free counter-rotating discs (12a, 13a), and the second braking device (10b) comprises exactly one second friction lining disc (11b) axially displaceable and rotationally fixed to the second side shaft (6b) and provided with a friction lining on both sides, which is arranged axially between two second friction-free counter-rotating discs (12b, 13b), wherein one of the friction-free counter-rotating discs (12a, 12b) is rigidly connected to the drive housing (2), and the other friction-free counter-rotating disc (13a, 13b) is connected to the respective first or second auxiliary housing (9a, 9b) in a rotationally fixed and axially displaceable manner.
  2. Integrative drive unit (1) according to Claim 1 characterized in that on each of the two counter-rotating discs (12a, 12b) A cooling disc (14a, 14b) is attached to the axial end face of the counter-rotating disc (12a, 12b) facing away from one of the friction lining discs (11a, 11b). The cooling disc is firmly connected to the respective counter-rotating disc (12a, 12b).
  3. Integrative drive unit (1) according to Claim 2 characterized in that the respective cooling disc (14a, 14b) is firmly connected to the additional housing (9a, 9b) and can be supplied with a cooling medium via the additional housing (9a, 9b).
  4. Integrative drive device (1) according to one of the preceding claims characterized in that the first and the second friction lining disc (11a, 11b) are each connected at least indirectly to a respective first or second tripod joint of the respective first or second side shaft (6a, 6b) via a plug-in toothing (15a, 15b) arranged on an inner circumference.
  5. Integrative drive device (1) according to one of the preceding claims characterized in that the first and the second brake device (10a, 10b) can be actuated by a respective hydraulic actuating device (16a, 16b), wherein a respective actuating piston (17a, 17b) and a respective corresponding piston chamber (18a, 18b) are each arranged in a cover (19a, 19b) which is rigidly connected to the respective first or second auxiliary housing (9a, 9b).
  6. Integrative drive device (1) according to one of the preceding claims characterized in that the first and the second additional housing (9a, 9b) each form a first and a second drive housing cover.

Description

The invention relates to an integrated drive device according to claim 1. The object of the invention is to provide a compact drive unit with an integrated braking system for a vehicle, which ensures the dissipation of heat generated during braking. The invention is defined by the features of independent claim 1. Advantageous further developments and embodiments are the subject of dependent claims. The problem is solved according to the features of claim 1 by an integrated drive device for a vehicle with a drive housing, wherein an electric machine for generating a drive torque for the vehicle, at least one gear stage and a differential unit for outputting a translated drive torque to a first side shaft and a first wheel and to a second side shaft and a second wheel of a drive axle of the vehicle is integrated into the drive housing. According to the invention, the electric machine is arranged coaxially to the drive shaft, wherein a first auxiliary housing is attached to the drive housing on a first axial side of the drive housing, with a first braking device integrated in the first auxiliary housing and arranged coaxially to the electric machine for generating a braking torque on the first wheel, and a second auxiliary housing is attached to the drive housing on a second axial side of the drive housing, with a second braking device integrated in the second auxiliary housing and arranged coaxially to the electric machine for generating a braking torque on the second wheel. Furthermore, according to the invention, the first braking device comprises exactly one first friction disc, axially displaceable and rotationally fixed to the first side shaft and provided with a friction lining on both sides, which is arranged axially between two first friction-free counter-rotating discs, and the second braking device comprises exactly one second friction disc, axially displaceable and rotationally fixed to the second side shaft and provided with a friction lining on both sides, which is arranged axially between two second friction-free counter-rotating discs, wherein one of the friction-free counter-rotating discs is fixedly connected to the drive housing, and the other The counter-rotating disc, free of lining, is connected to the respective first or second auxiliary housing in a rotationally fixed and axially displaceable manner. In one embodiment of the invention, a cooling disc is attached to one of the two counter-running discs on an axial end face of the counter-running disc facing away from the friction lining disc, and the cooling disc is firmly connected to the respective counter-running disc. In one embodiment of the invention, the respective cooling disc is firmly connected to the additional housing and can be supplied with a cooling medium via the additional housing. Advantageously, with the integrative drive unit according to the invention of this design, dry-running brake devices can be integrated into the drive housing of a drive unit, in particular an electric axle drive unit, and any waste heat generated during braking operations can be effectively dissipated via a coolant-cooled counter-rotating disc via the cooling system of the drive unit and/or the vehicle cooling system. In one embodiment of the invention, the first and the second friction lining disc are each connected at least indirectly to a respective first or second tripod joint of the respective first or second side shaft via a splined connection arranged on an inner circumference. In one embodiment of the invention, the first and second brake devices can be actuated by a respective hydraulic actuating device, wherein a respective actuating piston and a respective corresponding piston chamber are each arranged in a cover rigidly connected to the respective first or second auxiliary housing. In one embodiment of the invention, the first and second auxiliary housings each form a first and a second drive housing cover. It shows: 1 : an integrative drive device according to the invention 1 Figure 1 shows an integrated drive unit 1 for a vehicle with an electric machine 3 for generating drive torque for the vehicle. A rotor of the electric machine 3 is connected, or connectable, to a transmission unit 4 for torque transmission. The transmission unit 5 can be designed as a non-switchable transmission unit with a fixed gear ratio or as a switchable transmission unit. An output element of the transmission unit 4 is connected to a differential unit 5, which transmits a torque provided by the transmission unit 4 to a first side shaft 6a connected to a transmission shaft 20. The first wheel 7a is connected to a drive shaft 6b and the second wheel is connected to a second side shaft 6b. The electric machine 3 is arranged coaxially to the transmission shaft and to a drive axle 8. The integrated drive unit 1 is integrated in a drive housing. On a first axial side of the drive housing 1, a first auxiliary housing 9a is attached to the drive housing 2, wit