Power transmission device

A power transmission device for distributing torque from a power source to an external device and an auxiliary device, comprising:

• a first bearing secured to a first stationary member;
• a second bearing secured to a second stationary member;
• a first sprocket rotatably supported by the first bearing;
• a second sprocket configured to be drivingly coupled with the auxiliary device;
• a chain coupling the first sprocket with the second sprocket;
• a rotary shaft rotatably supported by the second bearing, the rotary shaft being drivingly coupled with the power source and drivingly engageable with the external device to transmit a first part of the torque to the external device;
• a joint drivingly linking the rotary shaft with the first sprocket to transmit a second part of the torque to the first sprocket;
• and
• a coupling between the rotary shaft and the joint that mutually engages the rotary shaft and the joint such that torque transmitted from the power source to the first sprocket via the coupling causes the chain to run,
• wherein the first sprocket, the joint, the first bearing and the coupling are radially overlapped,
• wherein the first sprocket includes a notch configured to engage with the joint, and the joint includes a latch engageable with the notch such that the notch and the latch maintain a clearance in a radial direction of the rotary shaft.