IP Library › Granted Patent US 12680601

Granted Patent B2

US 12680601 · App. 18/880,311 · Granted Jul 14, 2026

Motor vehicle drive device

Inventors: Richard Baeumler (Munich, DE); Stefan Brachmeier (Landshut, DE); Georg Johann Meingassner (Taufkirchen, DE); Tobias Riesch (Lenggries, DE); Michael Staake (Munich, DE)

Assignee: Bayerische Motoren Werke Aktiengesellschaft

F16H57/021 F16H1/20 F16H57/031 F16H55/17 F16H2057/02034 F16H2057/02052

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Quick Facts

Patent No.: US 12680601
App. No.: 18/880,311
Granted: Jul 14, 2026
Kind: B2

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Abstract

A motor vehicle drive system having a traction transmission device. A traction transmission drive shaft is rotatably mounted in the transmission housing device. A traction transmission intermediate shaft is arranged axially parallel to and radially spaced apart from the traction transmission drive shaft. A traction transmission output shaft is arranged axially parallel to and radially spaced apart from the other two traction transmission shafts. The motor vehicle drive system is characterized in that the three traction transmission shafts are each mounted in the traction transmission housing device with a fixed/floating bearing; such a bearing has in each case at least one fixed bearing for absorbing axial forces; and at least two of these fixed bearings are mounted in the traction transmission cover.

Claims (77)

1 . A motor vehicle drive system, comprising:

an electromechanical energy converter as an electric drive machine;

a traction transmission apparatus for transmitting drive power to a motor vehicle axle drive, wherein the traction transmission apparatus comprises:

a traction transmission housing device, wherein a traction transmission drive shaft is rotatably mounted in the traction transmission housing device and is connected for conjoint rotation, or is selectively connectable for conjoint rotation, to the electric drive machine,

a traction transmission intermediate shaft, which is rotatably mounted in the traction transmission housing device and which is arranged axially parallel to and at a radial spacing from the traction transmission drive shaft,

a traction transmission output shaft, which is rotatably mounted in the traction transmission housing device and which is arranged axially parallel to and at a radial spacing from the two other traction transmission shafts,

a traction transmission drive gearwheel arranged on the traction transmission drive shaft and meshing with a first traction transmission intermediate gearwheel arranged on the traction transmission intermediate shaft, and

a second traction transmission intermediate gearwheel arranged on the traction transmission intermediate shaft and meshing with a traction transmission output gearwheel arranged on the traction transmission output shaft, and

wherein the traction transmission housing device has a traction transmission housing and a traction transmission cover,

wherein the traction transmission drive shaft is mounted in the traction transmission housing device via a first fixed/floating bearing arrangement having a first fixed bearing configured to accommodate axial forces on the traction drive shaft and a first floating bearing configured to accommodate radial forces on the traction drive shaft,

wherein the traction transmission intermediate shaft is mounted in the traction transmission housing device via a second fixed/floating bearing arrangement having a second fixed bearing configured to accommodate axial forces on the traction transmission intermediate shaft and a second floating bearing configured to accommodate radial forces on the traction transmission intermediate shaft,

wherein the traction transmission output shaft is mounted in the traction transmission housing device via a third fixed/floating bearing arrangement having a third fixed bearing configured to accommodate axial forces on the traction transmission output shaft and a third floating bearing configured to accommodate radial forces on the traction transmission output shaft,

wherein at least two of said first, second, and/or third fixed bearings are arranged in the traction transmission cover,

wherein the traction transmission drive gearwheel and the first traction transmission intermediate gearwheel form a first traction transmission gearwheel stage, and

wherein a transverse contact ratio of said first traction transmission gearwheel stage is greater than 1.70 and less than 1.90.

2 . The motor vehicle drive system according to claim 1 , wherein

all of the fixed bearings of the traction transmission shafts are arranged in said traction transmission cover.

3 . The motor vehicle drive system according to claim 1 , wherein

an overlap ratio of the first traction transmission gearwheel stage is greater than 3.10 and less than 3.30.

4 . The motor vehicle drive system according to claim 1 , wherein

the second traction transmission intermediate gearwheel and the traction transmission output gearwheel form a second traction transmission gearwheel stage,

the transverse contact ratio of said second traction transmission gearwheel stage is greater than 1.40 and less than 1.60, and

an overlap ratio of the second traction transmission gearwheel stage is greater than 2.40 and less than 2.60.

5 . The motor vehicle drive system according to claim 1 , wherein

the first traction transmission intermediate gearwheel has a first helical toothing with a first helix angle and the second traction transmission intermediate gearwheel has a second helical toothing with a second helix angle, and

the first and the second helix angles are directed in the same direction, such that axial forces occurring at the two traction transmission intermediate gearwheels during power transmission at least partially cancel out.

6 . The motor vehicle drive system according to claim 1 , wherein

both the first fixed bearing and the first floating bearing are formed as deep groove ball bearings,

said first fixed bearing is arranged in the traction transmission cover, and

the electric drive machine is arranged on or in the traction transmission housing.

7 . The motor vehicle drive system according to claim 1 , wherein

both said second fixed bearing and said second floating bearing are formed as deep groove ball bearings, and

the second fixed bearing is arranged in the traction transmission cover.

8 . The motor vehicle drive system according to claim 1 , wherein

the third fixed bearing includes a first roller bearing and the third floating bearing includes a second roller bearing, and the first and second cylindrical roller bearings are arranged in an axial direction on different sides of the traction transmission output gearwheel, and

the third fixed bearing also includes a deep groove ball bearing or a four-point bearing and is arranged in the traction transmission cover.

9 . A motor vehicle, comprising:

at least one motor vehicle drive system according to claim 1 ;

wherein the motor vehicle has a direction of forward travel in which the motor vehicle is drivable by said motor vehicle drive system.

10 . The motor vehicle according to claim 9 , wherein

in relation to the direction of forward travel in a plane and when the motor vehicle drive system is in a planned installation position, the traction transmission drive shaft is arranged upstream of the traction transmission intermediate shaft, and

the traction transmission output shaft is arranged downstream of the traction transmission intermediate shaft.

11 . The motor vehicle according to claim 10 , wherein

in relation to the direction of forward travel in the plane and when the motor vehicle drive system is in the planned installation position, the traction transmission intermediate shaft is arranged higher than the traction transmission drive shaft, and

the traction transmission output shaft is arranged lower than the traction transmission drive shaft.

12 . The motor vehicle according to claim 9 , wherein

in relation to the direction of forward travel in a plane and when the motor vehicle drive system is in a planned installation position, the traction transmission drive shaft is arranged downstream of the traction transmission intermediate shaft, and

the traction transmission output shaft is arranged upstream of the traction transmission intermediate shaft.

13 . The motor vehicle according to claim 12 , wherein

in relation to the direction of forward travel in the plane and when the motor vehicle drive system is in the planned installation position, the traction transmission intermediate shaft is arranged lower than the traction transmission output shaft, and

the traction transmission drive shaft is arranged higher than the traction transmission output shaft.

14 . The motor vehicle according to claim 12 , wherein

the traction transmission drive shaft is arranged higher than the traction transmission output shaft.

15 . The motor vehicle according to claim 9 , wherein

the traction transmission output gearwheel has an output helical toothing with an output helix angle, and

the output helix angle is selected such that axial forces of the traction transmission output gearwheel during driving of the motor vehicle in the direction of forward travel are directed in the axial direction of the traction transmission output shaft from the traction transmission cover to the traction transmission housing.

16 . A motor vehicle drive system, comprising:

an electromechanical energy converter as an electric drive machine;

a traction transmission apparatus for transmitting drive power to a motor vehicle axle drive, wherein the traction transmission apparatus comprises:

wherein the traction transmission housing device has a traction transmission housing and a traction transmission cover,

wherein at least two of said first, second, and/or third fixed bearings are arranged in the traction transmission cover,

wherein the second traction transmission intermediate gearwheel and the traction transmission output gearwheel form a second traction transmission gearwheel stage, and

wherein the transverse contact ratio of said second traction transmission gearwheel stage is greater than 1.40 and less than 1.60.

17 . The motor vehicle drive system according to claim 16 , wherein

an overlap ratio of the second traction transmission gearwheel stage is greater than 2.40 and less than 2.60.

18 . The motor vehicle drive system according to claim 16 , wherein

the second traction transmission intermediate gearwheel and the traction transmission output gearwheel form a second traction transmission gearwheel stage, and

the transverse contact ratio of said second traction transmission gearwheel stage is greater than 1.40 and less than 1.60.