Internal combustion engine driven hydraulic pump

A reciprocating rotating internal combustion engine for producing direct hydraulic work, comprising:

• A) a cylindrical combustion assembly housing having an outer housing radius;
• B) a combustion chamber disposed within the combustion housing;
• C) at least two pairs of free pistons disposed within the combustion chamber and dividing the combustion chamber into at least four combustion chamber portions that are disposed in a first ring that is concentric with the combustion housing and is disposed within the outer housing radius, the free pistons moveable between first piston positions and second piston positions;
• D) a pumping assembly housing;
• E) a pumping chamber disposed within the pumping housing;
• and
• F) at least two pairs of pump vanes;
• i) disposed within the pumping chamber;
• ii) dividing the pumping chamber into at least four pumping chamber portions that are disposed in a second ring;
• a) concentric with the combustion housing;
• and
• b) disposed within the first ring;
• iii) coupled to the free pistons such that each pair of pump vanes is coupled to one pair the free pistons to form combined piston pump pairs, each combined pair aligned along a common diameter of the combustion housing and rotatable with respect to an axis of common rotation;
• and
• iv) moveable between first pump positions and second pump positions corresponding to the first and second piston positions respectively;
• G) wherein:
• i) the at least four combustion chamber portions and pumping chamber portions are disposed between adjacent pistons and pump vanes respectively;
• ii) the pairs of pistons reciprocally rotate with respect to one another so as to sequentially compress and expand the combustion chamber portions in pairs disposed on either side of each piston under a combustion event force in two of the combustion chambers;
• and
• iii) the pump vanes reciprocally rotate with respect to one another so as to sequentially intake and pressurize the working fluid in pump chamber portions disposed on either side of each pump vane.