Pneudraulic rotary pump and motor

An expansible chamber apparatus comprising:

• a stator housing;
• a shaft and bearings rotating within the stator housing and having a cylindrical rotor fixed to the shaft for concentric rotation about the shaft rotation axis;
• the cylindrical rotor having at least one axial end and having at least one continuous groove in the rotor axial end, with the groove having constant width and constant axial depth;
• the groove having a radially inward surface and a radially outward surface, having a plurality of constant radial distance sectors where the radial distance from the rotation axis to a groove center is constant and having a plurality of transitional radial distance sectors where the radial distance from the rotation axis to a groove center is variable;
• the rotor rotating with its axial end in close proximity to an axial stator face of the housing, and the stator having a land ring with an end face, where the land ring is axially concentric with the rotation axis and extends into the rotor groove to form a close proximity seal between the land ring end face and the axial end face of the groove, where the land ring divides the rotor groove into an inner groove chamber and an outer groove chamber and always forms tolerance seals at the constant radius sectors of the rotor groove on the radially inward surface and on the radially outward surface of the rotor groove;
• a selected number of abutments that each further divides the groove in an approximately circumferential direction by providing a radially oriented surface that fits the rotor groove cross section and that is allowed to move approximately radially to accommodate the position of the rotor groove as the groove rotates and as the radial distance from the groove center to the rotation axis moves inward or outward during the transitional radius sectors, the abutment being allowed to move on a projection from the axial stator face at a radial distance from the rotation axis that is approximately equal to the radial distance of a center of the land ring from the rotation axis and being free to be moved by a fluid that flows in the groove;
• one slot in the land ring for each abutment, with each abutment located in its own abutment slot;
• the rotor having a plurality of pairs of inner groove chambers and outer groove chambers, formed by the sectors of constant radial distance and by the sectors of transition radial distance in the rotor groove and by the land ring, where at least one pair of an inner groove chamber and an outer groove chamber includes an abutment, where the selected number of abutments is less than the plurality of pairs of chambers;
• and
• an intake port and a discharge port, located on opposite sides of the abutment, such that the port boundaries are defined by the abutment and such distance around the axis of rotation as allowed by the length of constant radius of the groove on either side such that the ports do not communicate with each other.

An expansible chamber apparatus comprising:

• a stator housing;
• a shaft and bearings rotating within the stator housing and having a cylindrical rotor fixed to the shaft for concentric rotation about the shaft rotation axis;
• the cylindrical rotor having at least one axial end and having at least one continuous groove in the rotor axial end, with the groove having constant width and constant-axial depth;
• the groove having a radially inward surface and a radially outward surface, having a plurality of constant radial distance sectors where the radial distance from the rotation axis to a groove center is constant and having a plurality of transitional radial distance sectors where the radial distance from the rotation axis to a groove center is variable;
• the rotor rotating with its axial end in close proximity to an axial stator face of the housing, and the stator having a land ring with an end face, where the land ring is axially concentric with the rotation axis and extends into the rotor groove to form a close proximity seal between the land ring end face and the axial end face of the groove, where the land ring divides the rotor groove into an inner groove chamber and an outer groove chamber and always forms tolerance seals at the constant radius sectors of the rotor groove on the radially inward surface and on the radially outward surface of the rotor groove;
• at least one abutment that further divides the groove in an approximately circumferential direction by providing a radially oriented surface that fits the rotor groove cross section and that is allowed to move approximately radially to accommodate the position of the rotor groove as the groove rotates and as the radial distance from the groove center to the rotation axis moves inward or outward during the transitional radius sectors, the abutment being allowed to move on a projection from the axial stator face at a radial distance from the rotation axis that is approximately equal to the radial distance of a center of the land ring from the rotation axis and being free to be moved by a fluid that flows in the groove, the abutment having a mass density that is approximately equal to the mass density of the fluid;
• and
• one slot in the land ring for each abutment, with each abutment located in its own abutment slot;
• an intake port and a discharge port, located on opposite sides of the abutment, such that the port boundaries are defined by the abutment and such distance around the axis of rotation as allowed by the length of constant radius of the groove on either side such that the ports do not communicate with each other.

An expansible chamber apparatus comprising:

• a stator housing;
• a shaft and bearings mounted for rotation within said stator housing and having a cylindrical rotor fixed to said shaft for concentric rotation;
• the cylindrical rotor having at least one planar axial end face which has at least one smooth continuous groove in said end face, said groove having constant width and constant axial depth and said groove being not concentric with said shaft axis,
• said rotor rotating with its axial end face in close contact with a planar axial stator end face;
• said stator face having a projecting land ring, said land ring being concentric with said axis of rotation and said land ring having a planar end face and said land ring extending into said rotor groove so that the land ring planar end face is in close proximity with the planar bottom of the rotor groove, said land ring having a depth equal to the depth of the rotor groove, and said land ring being in close contact for a tolerance seal with at least one tangent line on outward surface of said rotor groove and at least one tangent line on the inward rotor groove surface such that said land ring divides said rotor groove chamber into at least two chambers;
• said chambers totally enclosing the fluid momentarily at one position of rotation of the rotor for each chamber and for all other positions maintaining at least one tolerance seal between the suction side and discharge side so that the two never communicate;
• at least one abutment that further divides the rotor groove chamber in an approximately circumferential direction by providing a radially oriented surface that fits the rotor groove being the same width and depth as said rotor groove, said abutment being allowed to move approximately radially to follow the surface of the rotor groove as the rotor rotates, said abutment having a contoured shape to provide a fluid wedge between said abutment and said rotor groove inward and outward so that said fluid wedge causes said abutment to move radially inward and outward and said abutment being restrained from circumferential motion by a projection from said stator end face, said projection providing a surface upon which said abutment is balanced for a pivoting, rolling, or sliding motion and said abutment having a specific gravity approximately equal to that of the pumped fluid and intake and discharge ports located either side of the abutment through the stator end face and which are curved and triangular in shape with one leg of the shape being the boundary of the abutment and the other two legs being the shape of the rotor groove in its upper and lower position, both said intake port and said discharge ports having a teardrop shaped port opening located radially inward of the land ring and also radially outward of the land, said ports being joined in the ducting, and said ports extending circumferentially so as to allow fluid to be drawn in and out over a large angle of rotation for each port;
• and one slot in the land ring for each abutment, with each abutment located in its own abutment slot.