Rotary coupling for an all-wheel drive vehicle

A drivetrain (100) for an all-wheel drive vehicle, comprising:

• an engine (110);
• a transmission (112);
• at least a first wheel;
• and
• a rotary coupling (200) that is operable to selectively deliver driving power to the first wheel, the rotary coupling (200) including:
• a housing (210),
• an input part (212),
• an output part (214),
• a clutch (220) that is disposed within a clutch area (222) of the housing (210) and is movable between an engaged position and a disengaged position to change an amount of torque transferred from the input part (212) to the output part (214),
• a fluid reservoir (260) defined in the housing (210),
• a lubrication valve (250) that is movable between an open position and a closed position for controlling supply of a fluid from the fluid reservoir (260) to the clutch area (222) of the housing (210), and
• an actuator (238) that is connected to the clutch (220) to move the clutch (220) between the engaged position and the disengaged position and connected to the lubrication valve (250) to move the lubrication valve (250) between the open position and the closed position.