Toroidal heat exchanger having a hydraulic fan drive motor

In a vehicle having an engine means generating a plurality of heated fluids an apparatus for affecting the heat content of said fluids, said apparatus comprising:

• a toroidal heat exchanger having a plurality of annular ring sections, each section having an inlet header tank and an outlet header tank equipped with respective inlet and outlet ports and a plurality of core elements connecting respective inlet and outlet header tanks allowing fluid passage from the inlet header tanks to the outlet header tanks;
• conduit means connecting said inlet and outlet header tanks to fluid sources of said engine for allowing fluid communication between said engine and said toroidal heat exchanger;
• one of said fluid sources being an engine cooling fluid and at least one of hydraulic operating fluid and lubricating fluid;
• a support cone being truncated above the base thereof to form a conical frustrum located in the interior portion of the toroidal heat exchanger surrounded by said core elements thereof, the truncated portion of the support cone covered with a plate having a plurality of apertures therein;
• a hydraulic motor having an output shaft, said motor affixed to said plate of said support cone, said output shaft projecting through an aperture in said plate, the hydraulic motor located completely inside said support cone;
• a fan having multiple blades carried on said hydraulic motor shaft, said fan blades being positioned outboard of said annular ring sections of said toroidal heat exchanger;
• a source of pressurized hydraulic fluid for driving said hydraulic motor;
• hydraulic fluid conduit allowing fluid communication between said source of pressurized hydraulic fluid and said hydraulic motor;
• a normally closed temperature responsive spool valve for controlling hydraulic fluid flow to said hydraulic motor from said source of hydraulic fluid interposed between said hydraulic fluid source and said hydraulic motor;
• conduit means allowing communication of heat fluid from said engine to said temperature responsive spool valve whereby said temperature responsive spool valve is caused to open such that said hydraulic motor receives hydraulic fluid from said source of hydraulic fluid in response to the displacement of said spool valve.