Torque convertor

A power transmission device which can be mounted on a manual speed change gear in a vehicle, for transmitting power from an engine to said manual speed change gear, comprising:

• a torque convertor body which is supplied with hydraulic operating fluid for transmitting power and can be connected to an input-side rotation member on the side of said engine;
• a power disconnecting clutch for transmitting power from said torque convertor body;
• a fluid chamber encompassing said torque convertor body and said power disconnecting clutch;
• a housing containing said torque convertor body and said power disconnecting clutch;
• an oil storing part disposed at the bottom of said housing for storing hydraulic fluid to be supplied to said torque convertor body and said power disconnecting clutch;
• an oil pump fixed to said housing for pumping up the hydraulic fluid in said oil storing part;
• and
• a control valve provided in said housing for controlling the flow of the hydraulic fluid from said oil pump to supply the hydraulic fluid to said torque convertor body and said power disconnecting clutch.

A torque convertor comprising:

• a torque convertor body having a toroidal shape for transmitting power from an input-side rotation member to an output-side member through hydraulic fluid;
• a power disconnecting clutch disposed laterally of said torque convertor body for connecting and disconnecting said torque convertor body to and from said output-side member, said power disconnecting clutch including a torsion spring for absorbing a shock of clutch engagement;
• and
• a lock-up clutch disposed radially outward of said torque convertor body and in a space in an axial direction including said torque convertor body and said power disconnecting clutch for connecting and disconnecting said input-side rotation member to and from said power disconnecting clutch.