Vehicle drive device with variable transmission

1. A vehicle drive device with a variable transmission, the vehicle drive device comprising:

a first driving module that provides a driving force;

a second driving module that controls a transmission ratio;

a housing in which the first driving module and the second driving module are accommodated;

a transmission part comprising a first rotor, a second rotor, and a third rotor provided inside the second driving module; and

an output part connected to one of the first rotor, the second rotor, and the third rotor,

wherein the first driving module is connected to another one of the first rotor, the second rotor, and the third rotor that is not connected to the output part,

wherein the second driving module is connected to yet another one of the first rotor, the second rotor, and the third rotor that is connected to neither the output part nor the first driving module,

wherein two or more first bearings are disposed between the housing and a shaft part that receives rotation of the first driving module and forms a rotational axis of the second driving module,

wherein two or more second bearings are provided on both sides of the shaft part on which the third rotor is coupled, and

wherein two or more third bearings are provided between the housing and the first rotor and between the first rotor and the second rotor.

2. The vehicle drive device of claim 1 ,

wherein the output part receives the rotation and outputs a rotational force changed in speed by the transmission part.

3. The vehicle drive device of claim 1 , wherein the housing comprises:

a first body part comprising a first body having one surface open in a first direction and a first cover configured to cover the first body; and

a second body part comprising a second body located on the other surface of the first body and opened in a second direction opposite to the first direction and a second cover.

4. The vehicle drive device of claim 3 , wherein the first driving module comprises:

a first stator comprising a first stator core fixed to the first body and a plurality of first coils placed along an inner circumference of the first stator core; and

an input rotor seated inside the first stator, coupled to the first stator to rotate around the shaft part, wherein a first magnet corresponding to the first coil is mounted in the input rotor.

5. The vehicle drive device of claim 4 , wherein the second driving module comprises:

a second stator comprising a second stator core fixed to the second body and a plurality of second coils placed along an inner circumference of the second stator core, and

wherein the first rotor is seated inside the second stator, coupled to the second stator to rotate around the shaft part, wherein a second magnet corresponding to the second coil is mounted in the first rotor.

6. The vehicle drive device of claim 3 , wherein the transmission part comprises:

the third rotor inserted into and coupled to the shaft part, configured to rotate along with the rotation of the shaft part, wherein a third magnet is mounted in the third rotor; and

a fourth magnet provided along an inner surface of the first rotor, and

wherein the second rotor comprises a harmonic modulator of a magnetic body rotating at a rate that changes depending on magnetic flux transferred between the first rotor and the third rotor.

7. The vehicle drive device of claim 5 , further comprising a control unit comprising a first inverter for controlling the first driving module and a second inverter for controlling the second driving module.

8. The vehicle drive device of claim 6 , wherein a first hole is formed in the other surface of the first body,

wherein a second hole connected to the first hole is formed in one surface of the second body, and

wherein a second exposure hole through which the output part is exposed is formed in a second cover.

9. The vehicle drive device of claim 1 , wherein the vehicle drive device operates:

in a first mode in which both of the first driving module and the second driving module are driven; or in a second mode in which one of the first driving module or the second driving module is driven and the other is fixed.

10. A vehicle drive device with a variable transmission, the vehicle drive device comprising:

a first driving module that provides a driving force;

a second driving module that controls a transmission ratio;

a transmission part comprising a first rotor, a second rotor, and a third rotor provided inside the second driving module; and

an output part comprising a first protrusion that protrudes from the first rotor and a second protrusion that protrudes from the second rotor,

wherein the third rotor is coupled to the first driving module to receive the driving force from the first driving module, and

wherein each of the first protrusion and the second protrusion of the output part provides a rotational output, the transmission ratio of which is controlled by the second driving module.