Power transmission device and rolling mill

A power transmission device comprising:

• a first power transmission path for transmitting a driving force of a motor to one driven shaft;
• and
• a second power transmission path for transmitting the driving force of the motor to the another driven shaft arranged to face the one driven shaft,
• wherein at least one of the first power transmission path or the second power transmission path includes:
• a first intermediate rotor which has an axial center position fixed to an output shaft of the motor and is rotated by the driving force of the motor;
• a second intermediate rotor rotated by the first intermediate rotor and moving along an outer circumference of the first intermediate rotor;
• and
• a driving shaft rotated by the second intermediate rotor and transmitting the driving force to the one driven shaft or the another driven shaft,
• wherein the driving shaft is configured to move in a direction perpendicular to an axial center direction of the driving shaft in accordance with movement of the second intermediate rotor around the first intermediate rotor, and
• wherein the power transmission device further includes:
• a link which maintains a constant axial-center distance between the first intermediate rotor and the second intermediate rotor rotated by the first intermediate rotor;
• and
• a first drive portion which is connected to a point of effort of the link holding the second intermediate rotor at a point of load with an axial center of the first intermediate rotor as a fulcrum, the first drive portion applying a swing force of moving the second intermediate rotor along the outer circumference of the first intermediate rotor such that a movement trajectory of an axial center of the second intermediate rotor makes a circular arc of a circle centered at the axial center of the first intermediate rotor.