Axial piston pumps

In an axial piston pump which includes a shaft, at least a plurality of annularly distributed pistons housed in cylinders of a fixed block and in permanent contact with an inclined plate fixed to the pump shaft, an annular rotatable valve mounted on an eccentric fixed to said shaft, inlet and outlet means in the block for the cylinders and means for ensuring an axial hydrostatical compensation, the improvement wherein said means comprise, for each piston housing, a pocket provided in said block and an axially movable bobbin housed in said pocket;

• and additionally comprising a continuous annular flange carried by said shaft of the pump and forming with each said bobbin a respective balancing recess, said pockets and said bobbins facing said annular flange carried by said shaft of the pump with said bobbins when sliding being in contact with a continuous surface of said flange, said recesses being formed exclusively by said bobbins and said continuous annular flange.