Integrative drive device for a vehicle

Abstract

The invention relates to an integrative drive device (1) for a vehicle, comprising a drive housing (2), wherein an electric machine (3) for generating a drive torque for the vehicle, a transmission device (4) having at least one transmission stage, and a differential unit (5) for outputting a gear-transmitted drive torque to a first axle shaft (6a) and a first wheel (7a) and to a second axle 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 with respect to the drive axle (8), and wherein a first additional housing (9a) is secured to the drive housing (2) on a first axial side of the drive housing (2), having a first braking device (10a), which is integrated in the first additional housing (9a) and is arranged coaxially with respect to the electric machine (3), for generating a braking torque on the first wheel (7a), and a second additional housing (9b) is secured to the drive housing (2) on a second axial side of the drive housing (2), having a second braking device (10b), which is integrated in the second additional housing (9b) and arranged coaxially with respect to the electric machine (3), for generating a braking torque on the second wheel (7b), and wherein the first braking device (10a) has precisely one first friction lining disc (11a) which is axially slidable and mounted for rotation with the first axle shaft (6a) and is axially provided on both sides with a friction lining and which is arranged axially between two first lining-free counter-running discs (12a, 13a), and the second braking device (10b) has precisely one second friction lining disc (11b) which is axially slidable and mounted for rotation with the second axle shaft (6b) and is axially provided on both sides with a friction lining and which is arranged axially between two second lining-free counter-running discs (12b, 13b), wherein a respective one of the lining-free counter-run

Description

[0001] Mercedes-Benz Group AG

[0002] Integrated drive unit for a vehicle

[0003] The invention relates to an integrated drive device according to claim 1.

[0004] 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.

[0005] The invention is defined by the features of independent claim 1. Advantageous further developments and embodiments are the subject of dependent claims.

[0006] 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 axis, wherein on a first axial side of the drive housing a first auxiliary housing is attached to 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 on a second axial side of the drive housing a second auxiliary housing is attached to 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, the first braking device according to the invention comprises exactly one first friction lining disc, which is axially displaceable and rotationally fixed to the first side shaft and provided with a friction lining on both sides, and which is arranged axially between two first friction-free counter-running discs, and the second braking device comprises exactly one second friction lining disc, which is axially displaceable and rotationally fixed to the second side shaft and provided with a friction lining on both sides, and which is arranged axially between two second friction-free counter-running discs, wherein one of the friction-free counter-running discs is fixedly connected to the drive housing, and the other friction-free counter-running disc is connected to the respective first or second auxiliary housing in a rotationally fixed and axially displaceable manner.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] In one embodiment of the invention, the first and second auxiliary housings each form a first and a second drive housing cover.

[0013] It shows:

[0014] Figure 1: An integrated drive unit according to the invention. 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 wheel 7a connected to a first side shaft 6a connected to a transmission shaft 20 and to a second wheel 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, 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 on a second axial side of the drive housing 2, a second auxiliary housing 9b is attached to the drive housing 2, 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.The first braking device 10a comprises exactly one first friction disc 11a, which is axially displaceable and non-rotatably connected to the first side shaft 6a and is provided with a friction lining on both sides. This first friction disc is arranged axially between two first friction discs 12a and 13a that are free of friction lining. The second braking device 10b comprises exactly one second friction disc 11b, which is axially displaceable and non-rotatably connected to the second side shaft 6b and is provided with a friction lining on both sides. This second friction disc is arranged axially between two second friction discs 12b and 13b that are free of friction lining. One of the free friction discs 12a and 12b is fixedly connected to the drive housing 2, and the other free friction disc 13a and 13b is connected to the respective first or second auxiliary housing 9a and 9b in a manner that is non-rotatably displaceable and axially displaceable.

[0015] Each of the two counter-rotating discs 12a and 12b has a cooling disc 14a, 14b fixedly connected to the respective counter-rotating disc 12a, 12b on an axial end face facing away from the respective friction lining disc 11a, 11b. A cooling medium can flow through these cooling discs. The cooling discs 14a, 14b are fixedly connected to the respective auxiliary housing 9a, 9b and can be supplied with a cooling medium via the respective auxiliary housing 9a, 9b.

[0016] The first and second friction lining discs 11a, 11b are each connected directly or at least indirectly to a respective first or second tripod joint of the respective first or second side shaft 6a, 6b via a splined connection 15a, 15b arranged on an inner circumference.

[0017] The first and second brake devices 10a, 10b can be actuated by a respective hydraulic actuating device 16a, 16b, wherein respective actuating pistons 17a, 17b and respective corresponding piston chambers 18a, 18b are arranged in covers 19a, 19b which are firmly connected to the respective first or second auxiliary housing 9a, 9b.

[0018] The first and second auxiliary housings 9a, 9b each form a first and a second drive housing cover.

Claims

Mercedes-Benz Group AG Patent claims 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 [missing information] integrated in the first auxiliary housing (9a) and coaxial to the electric [missing information]. a first braking device (10a) arranged in the first side shaft (6a) for generating a braking torque on the first wheel (7a) and a second auxiliary housing (9b) attached to the drive housing (2) on a second axial side of the drive housing (2), 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), 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 non-coated counter-rotating discs (12b, 13b), wherein one of the non-coated counter-rotating discs (12a, 12b) is rigidly connected to the drive housing (2), and the other, The lining-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 device (1) according to claim 1 characterized in that a cooling disc (14a, 14b) is attached to one of the two counter-running discs (12a, 12b) on an axial end face of the counter-running disc (12a, 12b) facing away from the friction lining disc (11a, 11b).

3. Integrative drive device (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.

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