Device for torque vectoring
A torque vectoring apparatus may include a first planetary gear set including first to third rotation elements, wherein the first rotation element is gear-connected to receive power from the speed reduction device, the second rotation element is connected to be configured for transmitting power to the differential, and the third rotation element is selectively connectable to a housing through a coupling element; a second planetary gear set including fourth, fifth, and sixth rotation elements, wherein the fifth rotation element is fixedly connected to the third rotation element; and a third planetary gear set including seventh, eighth, and ninth rotation elements, wherein the seventh rotation element is fixedly connected to the fourth rotation element, the eighth rotation element is fixedly connected to one of the left and right output shafts while being fixedly connected to the sixth rotation element, and the ninth rotation element is fixedly connected to the housing.
1. A torque vectoring apparatus that utilizes a motor/generator as a power source and includes a speed reduction device reducing rotational power of the motor/generator, a differential that transmits rotational power transmitted from the speed reduction device while absorbing a rotation speed difference between first and second wheels, and a torque vectoring apparatus that adjust a torque ratio of torque distributed to the first wheel and the second wheel, and is disposed on first and second output shafts that connected to the differential,
wherein the torque vectoring apparatus comprises:
a first planetary gear set that includes a first rotation element, a second rotation element engaged to the first rotation element, and a third rotation element engaged to the second rotation element, wherein the first rotation element is engaged to the speed reduction device to receive power from the speed reduction device, the second rotation element is engaged to the differential for transmitting power to the differential, and the third rotation element is selectively connectable to a housing through a coupling element;
a second planetary gear set that includes a fourth rotation element, a fifth rotation element engaged to the fourth rotation element, and a sixth rotation element engaged to the fifth rotation element, wherein the fifth rotation element is fixedly connected to the third rotation element; and
a third planetary gear set that includes a seventh rotation element, an eighth rotation element engaged to the seventh rotation element, and a ninth rotation element engaged to the eighth rotation element, wherein the seventh rotation element is fixedly connected to the fourth rotation element, the eighth rotation element is fixedly connected to one of the first and second output shafts while being fixedly connected to the sixth rotation element, and the ninth rotation element is fixedly connected to the housing.
2. The torque vectoring apparatus of claim 1 , wherein the coupling element includes a brake which is mounted between the third rotation element and the housing and selectively connects the third rotation element to the housing.
3. The torque vectoring apparatus of claim 1 , wherein the first planetary gear set includes a single pinion planetary gear set and the first rotation element, the second rotation element, and the third rotation element are provided as a first linear gear, a first planet carrier, and a first ring gear, respectively,
the second planetary gear set includes a single pinion planetary gear set and the fourth rotation element, the fifth rotation element, and the sixth rotation element are provided as a second linear gear, a second planet carrier, and a second ring gear, respectively, and
the third planetary gear set includes a single pinion planetary gear set and the seventh rotation element, the eighth rotation element, and the ninth rotation element are provided as a third linear gear, a third planet carrier, and a third ring gear, respectively.
4. The torque vectoring apparatus of claim 1 , wherein the speed reduction device includes:
a driving gear which is connected to a rotor of the motor/generator through a hub;
a driven gear connected to the first rotation element of the torque vectoring apparatus; and
an idle gear device including an idle shaft and configured for transiting rotational power of the motor/generator through the idle shaft between the driving gear and the driven gear to reduce the rotational power of the motor/generator and to transmit the reduced rotational power to the torque vectoring apparatus.
5. The torque vectoring apparatus of claim 4 , wherein the idle gear device includes:
the idle shaft which is disposed parallel with the first and second output shafts;
an idle input gear which is rotatably mounted on the idle shaft and engaged to the driving gear; and
an idle output gear which is fixedly connected on the idle shaft and engaged to the driven gear.
6. The torque vectoring apparatus of claim 5 , wherein the idle gear device further includes a synchronizer which is mounted between the idle input gear and the idle shaft for selectively synchronizing of the idle input gear with the idle shaft.