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EP-4735776-A1 - TORQUE VECTORING DEVICE

EP4735776A1EP 4735776 A1EP4735776 A1EP 4735776A1EP-4735776-A1

Abstract

Disclosed is a torque vectoring device (1) for a transmission line of a vehicle, comprising a differential (5), an electric machine (2), a torque superposition unit (4) and a speed reduction gear (3), the speed reduction gear (3) being a cycloidal reduction gear or an elliptical reduction gear.

Inventors

  • LEBAS, GILLES
  • GEFFROY, Elie
  • VIOLA, PAOLO
  • PAUL, MAXIME

Assignees

  • VALEO EMBRAYAGES

Dates

Publication Date
20260506
Application Date
20240624

Claims (15)

  1. 1. A torque vectoring device (1) for a transmission line of a vehicle, the torque vectoring device comprising: - a differential (5) comprising a first input element (51) receiving a main torque, the first input element being capable of kinematically driving in rotation a first lateral shaft (6) and a second lateral shaft (7), via a first set of gears (52); - an electric machine (2) capable of providing a secondary torque and comprising a first rotor shaft (21) capable of rotating around a first axis of rotation (XI); - a speed reducer (3) comprising a second input element (31) and a first output element (32); - a torque superposition unit (4) comprising a second set of gears (40) configured to cooperate kinematically in rotation with the differential in order to ensure the transmission of an additional torque to the first lateral shaft; characterized in that the speed reducer comprises: - a fixed support (33) comprising a first circular circumference on which a first toothing (330) is arranged; - a rotating support (35) comprising a second circumference on which a second set of teeth (350) is arranged, the second set of teeth having a rotating radial eccentric movement causing the meshing of at least one tooth of the second set of teeth on at least one tooth of the first set of teeth of the fixed support, the rotating support kinematically driving the first output element in rotation; and - an eccentric (37) exerting at least one radial support on the second toothing in order to generate the rotating radial eccentric movement of the second toothing, the eccentric being linked in rotation to the second input element.
  2. 2. Torque vectoring device (1) according to claim 1 wherein: - the second input element (31) of the speed reducer (3) is rotationally connected to the first rotor shaft (21) of the electric machine (2); and - the second set of gears (40) of the torque superposition unit (4) comprises a first input-output (41), a second input-output (42) and a third input-output (43), the first input-output, the second input-output and the third input-output being configured to kinematically cooperate in rotation with the first output element (32) of the speed reducer, the first input element (51) of the differential (5) and the first side shaft (6).
  3. 3. Torque vectoring device (1) according to claim 1 or 2, said torque vectoring device (1) constituting an independent module, in particular an independent pre-assembled module.
  4. 4. Torque vectoring device (1) according to any one of claims 1 to 3, the speed reducer (3) being a cycloidal reducer type reducer.
  5. 5. Torque vectoring device (1) according to any one of claims 1 to 3, the speed reducer (3) being a reducer of the elliptical reducer type.
  6. 6. Torque vectoring device (1) according to any one of the preceding claims wherein the reduction ratio of the speed reducer (3) is between 10:1 and 200:1, preferably the reduction ratio of the speed reducer (3) is between 20:1 and 50:1.
  7. 7. Torque vectoring device (1) according to any one of the preceding claims, in which the first set of gears (52) of the differential (5) comprises cylindrical gears, in particular straight-toothed gears, in particular gears arranged in the form of a planetary gear train.
  8. 8. Torque vectoring device (1) according to any one of the preceding claims wherein the second set of gears (40) of the torque superposition unit (4) comprises at least one planetary gear set.
  9. 9. A torque vectoring device (1) according to claim 8 wherein the second set of gears (40) of the torque superposition unit (4) comprises a first planetary gear set (44) and a second planetary gear set (45), the first planetary gear set comprising: - a first planetary pinion (440) rotatably connected to the first output element (32) of the speed reducer (3); - first satellite pinions (441); - a first planet carrier (442) rotatably connected to the first side shaft (6); the second planetary gear comprising: - a second fixed planetary pinion (450); - second satellite pinions (451); - a second planet carrier (452) linked in rotation with the first input element (51) of the differential (5); the first planet pinions and the second planet pinions cooperating kinematically in rotation with a planetary ring gear (443) common to the first and second planetary gears.
  10. 10. A torque vectoring device (1) according to any preceding claim wherein a disconnecting clutch (8) is further provided for transmitting or interrupting the transmission of torque within the torque vectoring device.
  11. 11. Torque vectoring device (1) according to claim 10 wherein the disconnecting clutch (8) is provided to transmit or interrupt the transmission of torque between the speed reducer (3) and the torque superposition unit (4).
  12. 12. Torque vectoring device (1) according to claim 10 in combination with claim 9 wherein the disconnecting clutch (8) is provided to transmit or interrupt the transmission of torque between the second fixed planetary gear (450) and a frame (9) on which said second fixed planetary gear is fixed.
  13. 13. Torque vectoring device (1) according to any one of the preceding claims, in which the speed reducer (3), the torque superposition unit (4), the first side shaft (6) and the differential (5) are coaxial with the first axis of rotation (XI) of the first rotor shaft (21) of the electric machine (2).
  14. 14. Powertrain (10) comprising a torque vectoring device (1) according to any one of the preceding claims and further comprising: - a traction motor (11) comprising a second rotor shaft (110) capable of rotating about a second axis of rotation (X2); - a third set of gears (12) cooperating kinematically in rotation with on the one hand the second rotor shaft of the traction motor and on the other hand with the first input element (51) of the differential (5) to form one or more speed reduction ratios.
  15. 15. Powertrain (10) according to claim 14 in which the first axis of rotation (XI) of the first rotor shaft (21) of the electric machine (2) is parallel to the second axis of rotation (X2) of the second rotor shaft (110) of the traction motor (11).

Description

Description Title of the invention: Torque vectoring device Technical field [1] The invention relates to the field of transmission systems for motor vehicles, particularly for hybrid or electric vehicles. The invention relates more specifically to a torque vectoring device intended to distribute torque to the wheels of a vehicle. Technological background [2] Document W02017072329 describes a torque adaptation device for a vehicle axle. This type of device is intended to correct the dynamic behavior of the vehicle, in particular allowing improved trajectory control when cornering. The torque adaptation device is capable of providing a torque vectoring function via an electric motor controlling the torque difference between two output shafts of a differential. [3] However, such a device is not satisfactory because its compactness, cost and efficiency require improvements to meet the increased specifications of recent vehicle applications. [4] Furthermore, document W02012066035 describes a torque vectoring device where a single gear set composed of two planetary gears connected to a propulsion motor provides both a differential function, a torque vectoring function and a reduction function of the output speed of said propulsion motor. Since these three functions are performed by a single gear set, it proves impossible to make the torque vectoring device simpler and more compact. Summary [5] In all that follows, ordinal numeral adjectives are used to differentiate features. They do not define the position of a feature. For Therefore, for example, a third characteristic of a product does not mean that the product has a first and/or a second characteristic. [6] An idea underlying the invention is a torque vectoring device which makes it possible to solve one or more technical problems of the prior art, for example the aforementioned problems. [7] The invention relates to a torque vectoring device for a transmission line of a vehicle, the torque vectoring device comprising: - a differential comprising a first input element receiving a main torque, the first input element being capable of kinematically driving in rotation a first lateral shaft and a second lateral shaft, via a first set of gears; - an electric machine capable of providing a secondary torque and comprising a first rotor shaft capable of rotating around a first axis of rotation; - a speed reducer comprising a second input element and a first output element, - a torque superposition unit comprising a second set of gears configured to kinematically cooperate in rotation with the differential in order to ensure the transmission of an additional torque to the first lateral shaft; in which the speed reducer comprises: - a fixed support comprising a first circular circumference on which a first toothing is arranged; - a rotating support comprising a second circumference on which a second set of teeth is arranged, the second set of teeth having a rotating radial eccentric movement causing at least one tooth of the second set of teeth to engage at least one tooth of the first set of teeth of the fixed support, the rotating support kinematically rotating the first output element; - an eccentric exerting at least one radial support on the second toothing in order to generate the rotating radial eccentric movement of the second toothing, the eccentric being linked in rotation to the second input element; [8] For the purposes of this application: “axially” means “parallel to the first axis of rotation”; “radially” means “along an axis belonging to a plane orthogonal to the first axis of rotation and intersecting this first axis of rotation”; "angularly" or "circumferentially" means "around the first axis of rotation"; the terms "external" and "internal" are used to define the relative position of one component with respect to another, by reference to the axis of rotation for which they are concentric, a component close to said axis is thus qualified as internal as opposed to an external component located radially on the periphery; "rotationally connected" means "assembled so as not to rotate relative to each other". In other words, it is a rotationally solid connection, possibly with very little play such as spline play; the term "rotor shaft" should be understood broadly as the output component connected to the rotor of a rotating machine. [9] According to an additional characteristic of the invention - the second input element of the speed reducer is rotationally connected to the first rotor shaft of the electric machine; and - the second gear set of the torque superposition unit comprises a first input-output, a second input-output and a third input-output, the first input-output, the second input-output and the third input-output being configured to kinematically cooperate in rotation with the first output element of the speed reducer, the first input element of the differential and the first side shaft. [10] Thanks to the characteristics of this architect