DRIVE SYSTEM FOR A MOTOR VEHICLE

Abstract

A drive system for a motor vehicle includes a torque vectoring unit and a differential. The torque vectoring unit has an electrical machine for producing a torque. The differential has a common planet carrier, a first sun gear, a second sun gear, a first planetary gear set and a second planetary gear set. The first planetary gear set is rotatably mounted on the common planet carrier and in meshing engagement with the first sun gear. The second planetary gear set is rotatably mounted on the common planet carrier, in meshing engagement with the second sun gear and the first planetary gear set, connected to the torque vectoring unit, and arranged to redistribute the torque between the first sun gear and the second sun gear.

Claims

1.-10. (canceled)

11. A drive system for a motor vehicle comprising: a torque vectoring unit with an electrical machine for producing a torque; and, a differential comprising: a common planet carrier; a first sun gear; a second sun gear; a first planetary gear set, rotatably mounted on the common planet carrier and in meshing engagement with the first sun gear; a second planetary gear set: rotatably mounted on the common planet carrier; in meshing engagement with the second sun gear and the first planetary gear set; connected to the torque vectoring unit; and, arranged to redistribute the torque between the first sun gear and the second sun gear.

12. The drive system of claim 11 wherein the torque vectoring unit comprises a first planet carrier connected to the second sun gear.

13. The drive system of claim 12 wherein the torque vectoring unit comprises: a first planetary gear set rotatably mounted on the first planet carrier and radially meshed between a first ring gear and a first sun gear; and, a second planetary gear set, rotatably mounted on the common planet carrier and radially meshed between a second ring gear and a second sun gear.

14. The drive system of claim 13 wherein the first ring gear and the second ring gear are connected to one another for conjoint rotation.

15. The drive system as claimed in claim 11 wherein the common planet carrier is connected to the torque vectoring unit.

16. The drive system of claim 11 further comprising an electric drive motor connected to the common planet carrier.

17. The drive system claim 16 further comprising: a stepped planetary gear rotatably mounted on the common planet carrier and including a first toothing region and a second toothing region; an input sun gear; and, a stationary ring gear, wherein: the first toothing region is in meshing engagement with the input sun gear; and, the second toothing region is in meshing engagement with the stationary ring gear.

18. The drive system of claim 17 wherein the input sun gear is connected to the electric drive motor.

19. The drive system of claim 11 further comprising a first output shaft and a second output shaft, wherein the first sun gear is connected to the first output shaft and the second sun gear is connected to the second output shaft.

20. The drive system as claimed in claim 19 wherein the first sun gear is fixed stationary on a housing and the second sun gear is connected to the electrical machine.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Further measures that improve the present disclosure are explained in greater detail below together with the description of an illustrative embodiment of the present disclosure with reference to the single FIGURE. The single FIGURE shows a simplified schematic depiction intended to illustrate the construction of a drive system according to the present disclosure.

DETAILED DESCRIPTION

[0012] According to the single FIGURE, a drive system according to the present disclosure for a motor vehiclenot shown herehas a differential 2, a speed-transforming gear unit 17 and a torque vectoring unit 1 with an electrical machine 6. The differential 2 includes a first and a second planetary gear set 3a, 3b as well as a common planet carrier 4, on which the two planetary gear sets 3a, 3b are rotatably mounted. A stepped planetary gear set 8 of the speed-transforming gear unit 17 is furthermore rotatably mounted on the common planet carrier 4. The stepped planetary gear set 8 has a first and a second toothing region 8a, 8b. The first toothing region 8a meshes with an input sun gear 9 and the second toothing region 8b meshes with a ring gear 14, which is fixed so as to be stationary on a housing 13.

[0013] To introduce a torque into the differential 2, the input sun gear 9 is connected to the electric drive motor 15. In this case, the torque is passed from the input sun gear 9, via the stepped planetary gear set 8, to the common planet carrier 4. The torque introduced is distributed between the two planetary gear sets 3a, 3b by means of the common planet carrier 4. The first planetary gear set 3a meshes with a first sun gear 5a and the second planetary gear set 3b meshes with a second sun gear 5b. Furthermore, the two planetary gear sets 3a, 3b mesh with one another as a pair. Consequently, the two planetary gear sets 3a, 3b are designed as differential planetary gear sets.

[0014] The first sun gear 5a is connected to a first output shaft 16a, and the second sun gear 5b is connected to a second output shaft 16b. Furthermore, the second sun gear 5b is connected to the torque vectoring unit 1 for the purpose of redistributing the torque between the two planetary gear sets 3a, 3b and thus also of redistributing the torque between the first and the second sun gear 5a, 5b. Furthermore, the common planet carrier 4 is connected to the torque vectoring unit 1 for the purpose of redistributing the torque between the two planetary gear sets 3a, 3b and thus also of redistributing the torque between the first and the second sun gear 5a, 5b.

[0015] The torque vectoring unit 1 includes a first and a second planetary gear set 10a, 10b. The first planetary gear set 10a is rotatably mounted on a first planet carrier 7 and meshes radially between a first ring gear 11a and a first sun gear 12a. The second planetary gear set 10b is rotatably mounted on the common planet carrier 4 and meshes radially between a second ring gear 11b and a second sun gear 12b. Consequently, the stepped planetary gear set 8 of the speed-transforming gear unit 17, the two planetary gear sets 3a, 3b of the differential 2, and the second planetary gear set 10b of the torque vectoring unit 1 are rotatably mounted on the common planet carrier 4. The two ring gears 11a, 11b are connected to one another for conjoint rotation. Furthermore, the first sun gear 12a is fixed so as to be stationary on the housing 13, and the second sun gear 12b is connected to the electrical machine 6. The first planet carrier 7 of the torque vectoring unit 1 is connected to the second sun gear 5b of the differential 2.

LIST OF REFERENCE NUMERALS

[0016] 1 torque vectoring unit

[0017] 2 differential

[0018] 3a, 3b planetary gear set

[0019] 4 common planet carrier

[0020] 5a, 5b sun gear

[0021] 6 electrical machine

[0022] 7 planet carrier

[0023] 8 stepped planetary gear set

[0024] 8a, 8b toothing region

[0025] 9 input sun gear

[0026] 10a, 10b planetary gear set

[0027] 11a, 11b ring gear

[0028] 12a, 12b sun gear

[0029] 13 housing

[0030] 14 ring gear

[0031] 15 electrical drive motor

[0032] 16a, 16b output shaft

[0033] 17 speed-transforming gear unit