Hybrid driving module

A hybrid drive module, which is disposed between an engine and a transmission of a power system and includes a motor configured to provide power to the transmission, the hybrid drive module comprising:

• a rotor hub on which a rotor of the motor is installed, the rotor hub dividing an internal space of the hybrid drive module into a first accommodation space and a second accommodation space in an axial direction;
• a fluid clutch and a first clutch pack connected to the rotor hub respectfully and accommodated in the first accommodation space, the first accommodation space configured to allow a first fluid for operating the fluid clutch and cooling the first clutch pack to flow and fill the first accommodation space;
• a first piston plate installed in the first accommodation space and configured to press or release the first clutch pack;
• a first operation chamber installed in the first accommodation space and filled with a second fluid that generates pressure for moving the first piston plate toward the first clutch pack;
• and
• a first compensation chamber installed in the first accommodation space and filled with a third fluid in the second accommodation space with pressure lower than pressure of the first fluid in the first accommodation space through the rotor hub,
• wherein the first piston plate has a first surface directed toward the first clutch pack in the axial direction and facing the first compensation chamber, and a second surface opposite to the first surface in the axial direction and facing the first operation chamber,
• wherein the first piston plate is disposed between the rotor hub and the first operation chamber in the axial direction, and
• wherein the first operation chamber is defined by the second surface and a support cylinder disposed to face the second surface in the axial direction and connected to the rotor hub.