Power transmission device

A power transmission device, comprising:

• a torque converter including a lock-up device, an urging member, a cover, an impeller, a turbine, a first hydraulic chamber, and a second hydraulic chamber, the lock-up device including a clutch part and a piston, the urging member urging the piston toward the clutch part;
• a first oil pathway in communication with the first hydraulic chamber;
• a second oil pathway in communication with the second hydraulic chamber;
• a switch device configured to be switched between a first position and a second position, the switch device being switched to the first position to supply a hydraulic oil to the first hydraulic chamber through the first oil pathway, the switch device being switched to the second position to supply the hydraulic oil to the second hydraulic chamber through the second oil pathway, the piston being configured to press the clutch part when the hydraulic oil is supplied to an interior of the first hydraulic chamber, and the piston is configured to release pressing the clutch part when the hydraulic oil is supplied to an interior of the second hydraulic chamber;
• an oil pump configured to supply the hydraulic oil to the torque converter through either the first or the second oil pathway;
• a pump motor configured to drive the oil pump;
• and
• a control part configured to control the pump motor and the switch device, wherein
• the control part includes a first lock-up-applying mode, a second lock-up-applying mode, and a lock-up-releasing mode, the control part executing the first lock-up-applying mode to stop actuating the pump motor, the control part executing the second lock-up-applying mode to actuate the pump motor and control and cause the switch device to be switched to the first position, the control part executing the lock-up-releasing mode to actuate the pump motor and control and cause the switch device to be switched to the second position.

A power transmission device, comprising:

• a torque converter including a lock-up device, an urging member, a cover, an impeller, a turbine, a first hydraulic chamber, and a second hydraulic chamber, the lock-up device including a clutch part and a piston, the urging member urging the piston toward the clutch part;
• a first oil pathway in communication with the first hydraulic chamber;
• a second oil pathway in communication with the second hydraulic chamber;
• a switch device configured to be switched between a first position and a second position, the switch device being switched to the first position to supply a hydraulic oil to the first hydraulic chamber through the first oil pathway, the switch device being switched to the second position to supply the hydraulic oil to the second hydraulic chamber through the second oil pathway, the piston being configured to press the clutch part when the hydraulic oil is supplied to an interior of the first hydraulic chamber, and the piston is configured to release pressing the clutch part when the hydraulic oil is supplied to an interior of the second hydraulic chamber;
• a drive motor configured to output a torque to the torque converter;
• and
• a branched oil pathway branched off from the first oil pathway, the branched oil pathway configured to supply the hydraulic oil to the drive motor.