Abstract: A bi-directional internal/external gear pump with advanced porting includes inlet and outlet ports symmetrical about a line perpendicular to the port centerline. An internal/external gear set is rotatable on parallel axes establishing the hydraulic centerline, which is advanced relative to the port centerline by some predetermined angle. One axis may be revolved about the other to shift the hydraulic centerline by substantially 180.degree. minus twice the angle of advance.

Abstract: A control device for a positionable pump has a body with inner and outer diameters eccentric to each other mounted in the pump housing bore and is actuated by hydraulic pressure in one angular direction. An opposing spring force acts in the opposite direction for controlling the angular position of the body. A controlled member is nested in the inside diameter of the body and a power rotated control member is nested within and drivingly engages the controlled member and is eccentric thereto, being a pair of pumping elements. The pump elements being gerotor or vane type elements utilized to pump fluids and which depend upon the eccentric position of their relative components for a fixed delivery of fluids. The body is controlled in infinitely angular positions relative to the pump housing to regulate the eccentric position of such pumping elements and thereby controlling the volume output of said pump elements relative to the demand of the external system increasing and diminishing needs.

Abstract: A gear ring pump has a housing with an inner hollow and a suction and pressure side, a hollow gear arranged in the housing and provided with between eight and sixteen teeth, and a driven pinion provided with teeth having by one tooth less than the hollow gear and engaging with the hollow gear so as to form a region of deepest engagement and a region which is opposite to the latter. The teeth heads of the pinion slide over the teeth of the hollow gear in the opposite region whereas the driving teeth flanks of the pinion abut against the teeth of the hollow gear in the region of deepest engagement so as to provide sealing between the suction side and pressure side. The teeth are formed so that the teeth heads of the pinion are freely received into the teeth gaps of the hollow gear and the teeth of the pinion has a shape determined by rolling of the pinion over the hollow gear. The teeth of the hollow gear have an approximately trapezoidal shape with convexly curved flanks and heads.

Abstract: A liquid pump, in particular for liquids having a low viscosity, for example, water, alcohols or other chemical liquids is provided of the type which includes a gear unit or a gerotor mounted in a housing which has an inner gear driven by a shaft. The inner gear of the gear unit is mounted on a bushing, the width of which is determined by the required hydrostatic support forces in such a manner that the support faces lie directly in the plane of the hydraulic radial forces.

Abstract: An improved cartridge-type pump provides inlets on each side of the pump to increase capacity from a material source disposed at one end of the pump housing. Moving pump gears are removed from a pump body to a lower end thereof and wear plates and gear ring define, in combination with a surrounding pump housing, upper and lower inlets of high volume capacity, respectively communicating between the material source at one end of the pump and both inlets of the pump. Increased intake to the upper inlet is provided, without internal machining of inlet ports in the lower end plate or the gear plate, and even though the gear plate is partially disposed in the housing sleeve between the upper inlet and the material source.

Abstract: A rotary gas expansion and compression device having a pair of rotors provided respectively with external and internal flutes differing in number by one, the form of which provides a continuous vertical contact. The rotors are meshed so that they form closed chambers which during rotation continuously vary in volume providing expansion and compression chambers.

Abstract: A reversible gerotor pump having unidirectional fluid flow therefrom dictated by a movable eccentric ring member 30 for positioning the rotor 46 of the pump gear-set 44 in either one of two axially eccentric positions depending upon the direction of rotation of the drive shaft 20 to the pump. Movement of the eccentric ring member from one such position to the other position upon a reversal of direction of the drive shaft is caused by check valve means 70 associated with the pump inlet 68 so that, if reverse rotation of the drive shaft momentarily causes reverse flow of the pumped fluid (e.g., causes the fluid to exit through the inlet) the check valve closes and establishes a hydraulic lock between the gear-set and forces the eccentric ring member to move from the one position to the other eccentric position whereupon the fluid is once again caused to be discharged through the normal pump outlet 64 and enter through the inlet.

Abstract: A hydraulic motor of the Gerotor-type which is designed for rotation in both the clockwise and the counterclockwise direction and which includes a pair of relief valves arranged to protect the motor shaft seal, irrespective of the chosen direction of rotation. The Gerotor element also includes a pair of motoring grooves which cooperate with a feed channel formed in the surface of the motor end plate and with a corresponding shadow feed channel on the opposite motor front plate to equalize the forces on the rotor element of the Gerotor and thereby prevent distortion and binding of the rotor element due to thrust forces thereon.

Abstract: A reversing eccentric member for a gerotor pump is shown. The eccentric member comprises a ring having opposed generally planar surfaces. One surface defines an arcuate notch for limiting rotation of the member. The opposite surface defines a slightly-raised radially innermost marginal portion which is knurled to minimize the surface area that supports the member in facing engagement with a stationary plate of the pump and also define channels to prevent sticking between lubricated adjacent machined surfaces. This limits the frictional engagement between the stationary plate and the eccentric member and the adhesive tendency of the film of lubricant therebetween so the member is generally freely and easily rotated on the plate in response to a change in the direction of rotation of the pump rotor.

Abstract: A reversible gerotor pump is shown which delivers a lubricant in a predetermined manner regardless of direction of rotation. The reversibility is provided by an eccentric collar having a cylindrical opening encircling the pump rotor and which is rotatable through a 180.degree. arc by frictional engagement with the rotor. To ensure this frictional engagement is greater than the frictional engagement between the collar and an adjacent stationary face plate which opposes rotation of the eccentric collar, the surface of the collar in facing engagement with the plate defines slight protrusions projecting therefrom. The protrusions abut the plate for a limited surface engagement therebetween and therefore provide limited frictional engagement. In this manner the friction between the collar and the stationary plate is minimized and the eccentric collar is relatively free to be rotated to either of two extreme positions within the 180.degree. arc depending upon the direction of the rotation of the rotor.

Abstract: A gear-type lubrication pump for an internal combustion engine wherein the pump housing and oil porting are formed in the engine block and one pump gear is rotatably supported in a bushing mounted in the engine block. The other pump gear is rotatably mounted on a bearing supported in the pump housing on a fastener which also locates a cover plate and seal in position to abut the outside face of the one gear and prevent leakage from the pump housing.

Abstract: A heat pump unit comprising a compressor and an expansion machine for respectively compressing and re-expanding a medium which circulates in a heating or cooling circuit. The power used for compressing this medium is at least partly recovered in the expansion machine and is used for driving the compressor. The compressor and the expansion machine are inner axle, intermeshing rotary piston engines which are arranged directly adjacent to one another on a common shaft. The inner side walls of the rotary engines are adjacent to each other and have cavities and thermal insulating means interposed between them and, while being interconnected, are fixedly connected on the one hand to the shaft and on the other hand with outer rotors. The shaft is rotatably journalled in eccentrics of inner rotors, which eccentrics are rigidly connected with a stationary housing.

Abstract: Immersion vibrator of the type employed for consolidating poured concrete and employing an unbalanced rotor, characterized by a gerotor type motor, operated by hydraulic pressure, for rotating the rotor. It is of particular utility as an accessory to certain paving machines having an engine driven hydraulic circulating pump.

Abstract: Bearing equipped mounting members for mounting a rotor within a rotor chamber of a rotary fluid pressure displacement device. The rotor chamber has axially spaced end walls, and a peripheral wall including a pair of diametrically opposed arcuate walls and a pair of circumferentially spaced radially inwardly opening recesses intermediate the arcuate walls. The rotor has a cylindrical surface of a diameter less than the diameter of the arcuate walls to provide greater than normal running clearance therebetween, and the mounting members are disposed within the recesses for running engagement with the rotor.

Abstract: Fluid inlet and outlet porting for a rotary fluid displacement device including a housing defining a cylindrical chamber and a pair of cooperating respective internally and externally toothed ring and star members in the chamber, the ring member encompassing the star member and having teeth at least one more in number than the star member, the members rotating on spaced parallel axes with the teeth thereof moving into and out of intermeshing engagement to provide alternately expanding and contracting fluid compartments. Inlet and outlet ports opening respectively to the expanding and contracting chambers, extend generally circumferentially of the ring member, the inlet port having one end in the shape of portions of the teeth of the ring and star members, said one end of the inlet port being disposed adjacent an area wherein the teeth of the members are out of intermeshing engagement.

Abstract: A stator-rotor assembly wherein rollers are used to form the internal teeth of the stator. The rotor has one less tooth than the stator and cooperates in gear relationship with the internal teeth of the stator. The stator has a plurality of cylindrically shaped pockets each containing a cylindrical roller. Each pocket is covered with a crushable porous coating to a thickness of X units. The radius of the pocket is R units and the radius of the rollers is equal to or greater than R-X units and less than R units. Each roller crushes the coating at spaced locations to trap fluid between the rollers and the pocket. The rotor has an average diameter that interferes with the tangent circle of the stator-roller assembly.

Abstract: A fluid pressure device such as a hydraulic pump is provided having an improved inlet porting arrangement to permit a greater output flow rate for a given input speed. The pump is of the type including a housing defining an inlet chamber and an outlet chamber and inner and outer rotors having spaced apart axes of rotation defining a line of eccentricity. The teeth of the rotors interengage to define a plurality of expanding and contracting volume chambers. The housing includes an end face adjacent the rotors at which the inlet chamber defines an inlet port communicating with the expanding volume chambers. The inlet port is generally arcuate and extends circumferentially from approximately the line of eccentricity on one side of the device to the line of eccentricity on the opposite side of the device.

Abstract: Internal gear set comparable to a geroter gear set except that all teeth are provided by rollers positioned in slightly oversize pockets. The internal gear set may have two, three or more gear members to provide, respectively, one, two or more sets of expanding and collapsing chambers and may be used as a hydraulic motor, pump and/or speed reducer.