Abstract: A positive displacement fuel pump utilizing an in-line pump and armature with a flexible drive connection and spring-pressed backing plate for the pump and short cantilever mount shaft for the pump rotor.

Abstract: A multi-purpose flow apparatus of the type which operates on the principle of volumetric displacement, has an internally helicoidal chamber rotatable about its center of gravity and having one of a constant or variable pitch and z.sub.k thread starts and an externally helicoidal spindle rotatable about an axis disposed at its center of gravity. The spindle has z.sub.o =z.sub.k +1 thread starts, the thread division thereof is z.sub.o /z.sub.k times the pitch of the chamber and the angular velocity of rotation of the spindle is z.sub.k /z.sub.o times that of the chamber.

Abstract: There is disclosed an hydraulic drilling motor for well drilling. The motor is of the push-down axial flow type. It is of vibration-free rotary chamber-type construction functioning with high torque wherein the r.p.m. and capacity of the drilling tool are in proportion with the velocity and pressure of the flowing medium. The motor consists of an internally threaded chamber with an arch parallel with the flow direction of an externally threaded spindle of z.sub.o =z.sub.k (arch or thread)+1, or z.sub.o =z.sub.k -1 thread, of identical course with the chamber, arranged in the chamber. The cross section of the spindle or chamber is prolate, peaked or curate cycloid. When the spindle is cycloid cross sectional, the cross section of the chamber is in the same plane, and when the chamber is in cycloid cross sectional the cross section of the spindle is in the same plane. This is limited by the external or internal envelope curve of the surface touched by the cycloid during relative motion.

Abstract: A hydraulic motor is disclosed using the helical gear elements as taught by Moineau in his early patents, as for example, U.S. Pat. No. 1,892,217 of Dec. 27, 1932. In the present invention the internal element of the Moineau pair is held against gyration but is permitted to rotate freely. The outer member of the Moineau gear pair is caused to turn without gyration when fluid is pumped through the motor. Compared with conventional Moineau gear pair motors, the volume of liquid to be pumped through the motor is reduced by 50% and therefore the fluid may be pumped at a higher pressure than is available with current Moineau gear pair motors. If the pressure is doubled, then the torque put out by the motor is doubled. While the device is useful in various applications, it is of particular value in connection with well drilling down-hole motors.

Abstract: A gear pump for unidirectionally transporting a fluid such as oil has a stationary housing with an inlet port and an outlet port on opposite sides of the axis of a cylindrical chamber in which a ring with an eccentric inner periphery is rotatable through an arc of 180.degree. between two limiting positions. Freely rotatable within the inner ring periphery is an annular outer rotor with internal gear teeth entrainable by a driven inner rotor with external gear teeth, the latter numbering one less than the internal gear teeth of the outer rotor. A face of the ring has one or more shallow depressions open toward the outer rotor, each depression being spanned by a leaf spring which is anchored to the ring and defines with the outer periphery of that rotor a wedge-shaped gap diverging symmetrically toward its ends to form alternate lodgments for a rotary coupling member such as a ball or a roller.

Abstract: A screw rotor machine is disclosed which comprises a screw cam rotor provided with gudgeons and a screw thread rotor enclosing the screw cam rotor. The screw cam rotor is made as single-thread-screw which is generated in relation to an inner base cylinder. The profile of the single-thread-screw is such that it in each cross section encloses both the inner base cylinder and the cylindrical extensions of the gudgeons. Furthermore the single-thread-screw comprises two parts having different lead angles.