Method of manufacturing segmented stators for helical gear pumps and motors

A process of making a stator for a helical gear expansible chamber device of the type having an elongated rotor with convex helically convoluted lobes, and an elongated stator having an elongated chamber for receiving said rotor, said chamber defining concave helically convoluted lobes, said chamber defining at least one more lobe than said rotor, said process comprising;

• forming a plurality of substantially identical metal disks, each of said disks defining in cross-section an opening defining radially extending lobes corresponding to the size and shape of said stator,
• placing the disks in aligned face-to-face stacked relationship with one another, with each disk rotated with respect to the next adjacent disks progressively along the length of the aligned disks in one direction of rotation to form the lobes of the disks into a concave helically convoluted chamber;
• inserting the stacked disks in a cylindrical housing, and
• metal brazing the disks to adjacent disks and to said housing.

A process of making a stator for a helical gear expansible chamber device of the type having an elongated rotor with convex helically convoluted lobes, and an elongated stator having an elongated chamber for receiving said rotor, said chamber defining concave helically convoluted lobes, said process comprising:

• forming a plurality of substantially identical disks, each of said disks defining a centrally positioned symmetrical rotor opening with lobes corresponding to the size and shape of the size and shape of said rotor, and a circular perimeter;
• placing the disks in a stacked relationship with respect to one another about a mandrel;
• passing the disks and the mandrel through a swaging tool to urge the circular perimeters of the disks in alignment with one another;
• inserting the disks into a housing;
• and
• bonding the disks to one another and to the housing.