Fluid transmission device

A fluid transmission device comprising:

• a cover member coupled to a drive shaft;
• a converter mechanism constituted by a pump impeller coupled to said cover member, a turbine runner connected to a driven shaft, which opposes said pump impeller and is covered by said cover member, and a stator disposed between said pump impeller and said turbine runner, for effecting power transmission between said drive shaft and said driven shaft via a working fluid that flows through a converter chamber formed internally;
• a lockup mechanism having a clutch piston that is provided in a lockup chamber surrounded by said cover member and a back surface of said turbine runner, for activating said clutch piston using a control fluid that is supplied to a clutch oil chamber surrounded by said cover member and a back surface of said clutch piston, and effecting power transmission bypassing said converter mechanism by engaging and disengaging said drive shaft and said driven shaft;
• an inlet passage for leading said working fluid into said lockup chamber from the outside;
• a communicating passage for leading said working fluid into said converter chamber from said lockup chamber;
• and
• an outlet passage for leading said working fluid to the outside from said converter chamber.