Abstract: In an internal gear pump or motor the insert control member between the inner and the outer gear is provided with balancing pockets, which receive fluid under pressure to counter-balance the pressure forces exerted onto the inner and outer gear of the device. Thereby it is obtained, that the radial forces of fluid onto the inner and outer gear are balancing each other by diametrically located oppositional directed fields of force of pressure in fluid. The inner and outer rotors such float freely between radial forces of fluid. Radial rest loads are prevented and the life of the rotors is extended. There may be a single insert or a plurality of inserts and there may be one or a plurality of suction chambers in the device. Additional outer guide means or pressure fields of fluid under pressure may be provided. The loading of the balancing pockets with pressure fluid may be done through respective passages from areas under pressure to said balancing pockets.

Abstract: A high-pressure rotary fluid-displacing machine is described which is suitable for use as a motor or pump. It comprises a housing, an internally toothed annular gear, an externally toothed pinion arranged eccentrically within said annular gear and intermeshing therewith, an engagement-free crescent-shaped gap being left between the addendum circles of the pinion and of the annular gear, respectively, on the side thereof opposite the contact point of the pitch circle of the pinion with the pitch circle of the annular gear, a shaft bearing the pinion and being adapted for transmitting torque, and a gap-filling member in the gap having an inner and an outer curved surface, the inner surface being sealingly contacted by the addendum surfaces of the teeth of the pinion, and the outer surface being sealingly contacted by the addendum surfaces of the teeth of the annular gear.

Abstract: An arrangement for mounting a gear on a drive shaft of a fuel pump includes a longitudinal slot dividing one end portion of the shaft into first and second cantilever sections. Shoulders formed in the slot on the cantilever sections abut a key extending transversly through the slot to protrude from the shaft and the key is received in keyways formed in the gear diametrically of each other and opening into a cylindrical aperture. The latter is sized to receive the inner end portion of the shaft with a press fit with end walls of the keyways abutting the protruding key to locate the shaft axially within the gear. The width of the slot separating the cantilever sections of the shaft is slightly greater than the diameter of the key thereby providing clearance between the key and the cantilever sections to allow deflection of the sections during press-fitting of the shaft in the gear.

Abstract: An internal-gear fluid-displacement machine, such as a fluid-displacing pump or a fluid-displaced motor includes an internal gear and a spur gear which meshes with the internal gear at a meshing region. A separating body fills a separating region between the gears which narrows toward the meshing region and separates the same from the remainder of the interspace between the gears. An actuating lever is mounted on the housing for pivoting and extends through the interspace, and a piston subjected to the pressure prevailing at the meshing region abuts against a free end of the actuating lever, pressing the same into abutment with that end of the separating body which faces into the remainder of the interspace. A strap connects the separating body to the actuating lever. The axial sides of the separating body have depressions therein which are bounded by narrow sealing projections which converge toward the meshing region.

Abstract: A hydrostatic gear machine is described which comprises a pair of gear wheels meshing with one another, one of the gear wheels being an internally toothed annular gear wheel and the other an externally toothed pinion, the tooth profile of at least one of said wheels being at least substantially trochoidal; the tooth profile of a first one of the two wheels being defined as being obtained by rolling the first wheel with meshing on the other wheel. The teeth of at least one of said wheels bear the thus defined profile only on a limited zone having a length just sufficient for the ratio of the angles of rotation of the two wheels to be constant throughout rotation of the wheels, and have their profile set back, outside the said limited zone, by a sufficient distance to eliminate contact, outside the limited zone, with the teeth of the other gear wheel.

Abstract: A gear pump or motor comprising a body having a cavity with high pressure and low pressure ports. A pinion, an internally toothed ring gear meshing together, a filling member interposed between pinion and ring gear and an arcuate bearing member are housed within the cavity. The pinion has a shaft which is journalled in the body. The arcuate bearing member is interposed between the periphery of the ring gear and the body wall near the low pressure port and yieldingly supports the ring gear such that the latter can shift in a direction of a plane of eccentricity containing the axis of rotation of the pinion and the ring gear. The arcuate bearing member defines, at its outer face, an area of low pressure, which is smaller than a further area of low pressure at its inner face which areas of low pressure are connected to one another.

Abstract: A high pressure hydraulic gear pump or motor of the internally geared type with a radially movable sealing plate arranged on one side of the filler member so as to form a seal against one gear, while the filler member forms a seal against the other gear, the sealing plate being arranged in a floating mode, with a sealing batten underneath it and springs biasing the plate and the batten radially outwardly. Pressure space delimiting control edges and tooth prefill passages are arranged on the sealing plate and on the filler member.

Abstract: An internal-external gear pump wherein the fluid displacement thereof is variable. The internal gear is rotatably driven by a drive shaft about a fixed axis and the external gear is rotatably driven by the internal gear about a controlled movable axis eccentric to the fixed axis. Movement of the external gear axis causes the eccentricity between the internal and external gear axes to vary, thereby resulting in a change in the depth of gear tooth mesh such that the volume of fluid displaced by the meshing teeth is varied. The position of the external gear axis is established by a control ring which rotatably supports the external gear, and is mounted in a stationary housing so as to be rotatably positionable within arcuate limits about a fixed axis eccentric to both the axes of the internal and external gears.

Abstract: An improved drive for the ignition distributor of an internal combustion engine of the type having a lubrication pump driven by its crankshaft. The pump has an internal gear driven by and coaxial with the crankshaft. An external gear has internal teeth and is driven, in planetary gear fashion, by the internal gear. A distributor shaft is rotatably mounted in the pump housing and has a helical tooth pinion gear that meshes with helical teeth on the external periphery of the external pump gear. Thus, the driven external gear drives the pinion gear and the distributor shaft. Preferably, the transmission ratio is 1 to 1.25 between the internal and external gears and 1 to 1.6 between the external and pinion gears, providing an overall ratio of 1 to 2 between crankshaft and distributor shaft.