Shift system and method for power transmission assembly

A power transmission method comprising:

• providing a first shaft, the first shaft rotatable at a variable rotation speed;
• providing a second shaft, the second shaft rotatable at a variable rotation speed;
• providing a gear assembly, the gear assembly includes at least a first gear ratio and a second gear ratio;
• providing a first one-way clutch associated with the first gear ratio, the first one-way clutch associated with the first gear ratio includes a torque transmitting locking element;
• providing a first one-way clutch associated with the second gear ratio, the first one-way clutch associated with the second gear ratio includes a torque transmitting locking element;
• deploying the torque transmitting locking element of the first one-way clutch associated with the first gear ratio and enabling torque from the first shaft to the second shaft in the first gear ratio;
• deploying the torque transmitting locking element of the first one-way clutch associated with the second gear ratio when the speed of the first shaft and the speed of the second gear ratio are not within a predetermined window of rotational speed;
• and
• changing the rotation speed of the first shaft to place the speed of the first shaft and the speed of the second gear ratio within the predetermined window of rotational speed, wherein the torque transmitting locking element of the first one-way clutch associated with the second gear ratio engages and enables torque from the first shaft to the second shaft in the second gear ratio.

A power transmission method comprising:

• providing a first shaft, the first shaft rotatable at a variable rotation speed;
• providing a second shaft, the second shaft rotatable at a variable rotation speed;
• providing a gear assembly, the gear assembly includes at least a first gear ratio and a second gear ratio;
• providing a first one-way clutch associated with the first gear ratio, the first one-way clutch associated with the first gear ratio includes a torque transmitting locking element, and a second one-way clutch associated with the first gear ratio, the second one-way clutch associated with the first gear ratio includes a torque transmitting element;
• providing a first one-way clutch associated with the second gear ratio, the first one-way clutch associated with the second gear ratio includes a torque transmitting locking element;
• enabling torque from the first shaft to the second shaft through the second gear ratio with the torque transmitting locking element of the first one-way clutch associated with the second gear ratio in a deployed position;
• deploying the torque transmitting locking element of the second one-way clutch associated with the first gear ratio before the speed of the first shaft and the speed of the first gear ratio are within a predetermined window of rotational speed;
• moving the torque transmitting locking element of the second one-way clutch associated with the second gear ratio to a nondeployed position;
• and
• after the torque transmitting locking element of the first one-way clutch associated with the second gear ratio is in a nondeployed position, changing the rotation speed of the first shaft to engage the torque transmitting locking element of the second one-way clutch associated with the first gear ratio wherein the torque transmitting element of the second one-way clutch associated with the first gear ratio transmits torque from the first gear ratio to the first shaft through the first gear ratio.