Abstract: The roller-vane hydraulic machine comprises a hollow casing (1) having working fluid inlet and outlet passages (2, 3). The casing (1) is provided with hollows opening into the space of the casing (1), said hollows accommodating rollers (4) interacting with a rotor (5) located inside of the casing (1). The casing (1) is provided with vanes (6) which, together with the casing (1) form a working space (7) divided by the rollers (4) into larger and smaller inter-roller chambers (8, 9) intercommunicated in pairs by hydraulic relief passages (14, 15). The rollers (4) have slots for the passage of the vanes (6) of the rotor (5). The larger and smaller inter-roller chambers (8, 9) are intercommunicated in pairs by passages (14, 15, 16, 17) in the casing (1).

Abstract: A radial piston rotary device is disclosed having a gear drive mechanism to convert the varying speed of rotating piston shafts into uniform rotational motion of a power shaft. The rotary device has a pair of radial pistons, each having diametrically opposed piston portions and each connected to concentric piston shafts. Each of the pistons is mounted within a housing so as to rotate about the longitudinal axis of the piston shafts. The drive system to convert the motion of the piston shafts to uniform rotational motion includes irregular gear sets operatively connected to each of the piston shafts. Each of the irregular gear sets has gear wheels with gear teeth segments extending over only a portion of their peripheries and also having different pitch diameters. The gear wheels are connected so as to rotate together, along with one of the radial pistons, as a unit. The other radial piston is connected to a separate irregular gear set having an identical construction.

Abstract: Two essentially identical oval shaped blades each attached rotatably by axles within a cylindrically shaped main chamber of a housing. Each blade has a cross-sectional profile approximating opposing larger radius 90 degree arcs connected by opposing smaller radius 90 degree arcs. Each blade is attached to a rotatable carriage assembly within the housing, and 180 degrees apart in the same orbital path about the rotational axis of the carriage assembly. The rotational axis of the carriage assembly, and the orbital path of the blades about the carriage assembly axis are eccentric relative to the center of the main chamber. A transmission and timing arrangement communicates and coordinates rotational movement between the carriage assembly and blades. The blades are positioned with the length of one blade perpendicular to the other blade length while rotating and orbiting about the axis of the rotating carriage assembly.

Abstract: A vacuum pump includes a rotor and at least one bearing that is supplied with a lubricant and that is situated, during operation, in a negative-pressure environment. In order to extend the useful life of the bearing, it is proposed that the bearing is formed from a ceramic material.

Abstract: A unitized structure of a main bearing and a cylinder of a rotary compressor is disclosed. The cylinder is formed integrally with and directly in the main bearing. Further, the inner circumferential corner of the cylinder is shaped in a round form, and the corresponding circumferential corner of the roller is shaped also in a round form. According to the present invention, the fastidious adjusting procedure required in assembling the conventional compressor and the drop of the effciency due to the variation of the clearance between the cylinder and the main bearing are all eliminated, thereby improving the productivity and the product quality.

Abstract: A rotary device having an outer rotor having bearings on a first axis, an inner rotor mounted within the outer rotor having bearings on a second axis of rotation offset from the first axis, and in which both outer and inner rotors rotate together in unison and define a spacing between the rotors varying from a minimum to a maximum at respective positions on opposite sides of the rotors, an enclosure at least partially enclosing the rotors, defining an inlet port and an outlet port, an outer annular wall and a plurality of semi-cylindrical contact bodies on the outer rotor, and a like plurality of recesses of semi-cylindrical shape in section in the inner rotor, and there being partitions between the recesses, with head portions on the partitions having a radiussed outward surface, and two acute angle corners, one at each end of the head portion, respective recesses receiving respective abutments so that, upon rotation, any one body may move inwardly and outwardly of its respective recess as the spacing betwee

Abstract: A vane-type rotary hydraulic machine that comprises a housing, a rotor mounted within the housing and having a plurality of radially extending peripheral slots, and a plurality of vanes individually slidably mounted in the rotor slots. A cam ring within the housing surrounds the rotor and has a radially inwardly directed surface forming a track for sliding engagement with the vanes. Symmetrical diametrically opposed fluid pressure cavities are formed between the cam ring surface and the rotor, and fluid inlet and outlet passages in the housing are coupled to the fluid pressure cavities.

Abstract: A nonlubricated screw fluid machine comprising a pair of rotors including a male and a female screw rotors provided with a dual lead tooth profile on the basis of the difference in the temperature between the outlet side and the inlet side when forming a tapered rotors considering the temperature distribution within the rotors in which each of the shape of the male and female rotors after the thermal expansion is employed as a basic tooth profile.

Abstract: A compressed-air vane motor comprises a rotor which is mounted on anti-friction bearings and has, distributed over the periphery, location slots in which vanes are guided in a radially displaceable manner and whose outer sealing edges bear by centrifugal force against the inner surface of the cylindrical outer shell. To reduce wear and friction, and to achieve a long service life when operating with oil-free compressed air, the outer shell, which is displaced eccentrically relative to the rotor, is rotatably guided in a housing and is driven along by the friction between the vanes and the outer shell, and the cylindrical outer shell is rotatably mounted in the housing by at least one air bearing and to this end is accommodated with little radial clearance in an approximately circular-cylindrical guide bore of the housing. In order to further reduce wear, at least one air pocket is provided and is open toward the outer shell in the housing.

Abstract: A pump has a housing which is used as a foundation and comprises a working space for product-feeding units. The bearing axles of the units are arranged in bearing sleeves and introduced into the pump housing from the rear so that the axles extend, via front recesses in the pump housing, into the working space for interaction with the units. Sliding ring seals are arranged at the front recesses in order to seal off the working space from the rear of the pump. The pump housing is provided with a removably fitted front gable in order to permit access to the sliding ring seals from the front end of the pump housing. The pump housing is designed as a seat for the rotationally fixed part of each sliding ring seal and interacts with an element which fixes the axial displacement for the rotationally fixed part. The seat and the rotationally fixed part are arranged for simple introduction into and for removal from the seat of the rotationally fixed part.

Abstract: An outlet valve for rotary rolling piston compressor, the piston being assembled within a cylinder block having an attached end wall provided with gas discharge passage whose outlet end defines an annular valve seat placed in an oblong recess area circumscribing the valve seat within which a valve blade is located, the area between the bottom wall with the circumscribing side wall of the oblong recess and/or with the peripheral wall of the valve seat being curved to reduce the turbulence of gas leaving the outlet of the discharge passage.

Abstract: A fluid motor includes an inner gear member and an outer gear member. The gear members are rotatable and orbital relative to each other and define expandable and contractible fluid pockets. The gear members rotate and orbit relative to each other as the fluid pockets expand and contract. A commutator valve is movable with one of the gear members and defines a first region in communication with high pressure, a second region in communication with low pressure, and a third region which is defined by a modulation opening which selectively communicates with high pressure or low pressure. The modulation opening communicates with at least one fluid pocket. A spool valve includes a valve member having at least two positions for controlling the speed of relative movement between the gear members. When the valve member is in a first position, the modulation opening communicates with the low pressure in the second region.

Abstract: A rotary vane hydraulic motor wherein pressurized liquids are admitted to the working chambers through intake passages oriented tangentially to the rotor peripheral surface. Each intake passage has two flat parallel side surfaces spaced apart approximately the transverse width of the working chamber, such that the liquid readily fills the chamber width dimension as it enters the chamber, without excessive turbulence or flow disruptions.

Abstract: A vane-type rotary compressor having wear and seizure resistance is disclosed comprising a cam ring having a cylindrical interior, a rotor rotatably installed in said cam ring, a vane arranged on the circumference of said rotor for radial movement toward and left from inner periphery of said cylindrical interior of said cam ring, and a pair of plates secured to corresponding front and rear portions of said cam ring to cover it, said cam ring and said rotor being formed of silicon rich aluminium alloy containing 12 to 20 wt % of silicon, said pair of plates being formed of aluminium or aluminium alloy, and said vane being formed of ferric sintered materials containing 3 to 8 wt % of carbon.

Abstract: A mechanical pump having a pumping chamber within which is positioned a pair of intermeshing rotors, preferably of the claw type, with each rotor mounted for rotation on respective shafts and the first rotor being associated with an inlet to the pumping chamber and the second rotor being associated with an outlet from the pumping chamber, wherein the second rotor has a cavity in its surface immediately adjacent the outlet.

Abstract: A gear motor comprises two meshing gears and a pressure plate pressed against respective lateral surfaces of the gears by pressure in two substantially concentric separate pressure areas arranged on a side of the pressure plate remote from the gears. A control valve controls pressure in one of the pressure areas to adjust a contact pressure of the pressure plate on the gear in such a manner as to increase the contact pressure with an increase in working pressure.

Abstract: A rotary pump-flowmeter comprises a body including a cylindrical cavity and a rotor assembly including at least one flange disposed within the cylindrical cavity in a rotatable arrangement about an axis of rotation parallel to and offset from the central axis of the cylindrical cavity and a plurality of flaps having a round first edge and a crescent second edge disposed about the axis of rotation and supported by the flange, wherein each of the plurality of flaps is pivotable about an axis of pivot parallel to and offset from the axis of the rotation and coinciding with the center of the radius defining the round first edge of the flap. Each individual flap includes at least one cam roller anchored to one end face of the flap in a rotatable arrangement about an axis parallel to and offset from the axis of the pivot of the flap.

Abstract: The present invention is drawn to a screw compressor having a wide operating range with respect to flow rate and pressure ratio, wherein a discharge opening portion of a casing is provided with a generally tapered notch portion so that compressed gas is gradually discharged from a certain fixed point where a volume ratio of one groove defined by rotors and the casing is smaller than an inherent built-in volume ratio. Since the present invention is arranged in the above-mentioned manner, the flow of the gas at the discharge opening portion is reduced by the notch portion which is readily formed. Thereby the variation range of the pressure (the amplitude of pulsation of the pressure) is decreased and the noise level is lowered. Further, a loss of pressure resulting from the rapid flow of the gas is restricted to thereby widen a range of preferable performance of the compressor.

Abstract: A sealed case has first and second housing portions. A motor section is arranged in the first housing portion of the sealed case and has a rotating shaft extending in the second housing portion. A compression mechanism section is arranged in the second housing portion of the sealed case and has first and second cylinders stacked on each other and first and second crank portions which are formed on the rotating shaft in the first and second cylinders, respectively. An accumulator is arranged outside the sealed case so as to substantially oppose an arrangement position of the motor section. A first suction pipe connects the accumulator to the first cylinder of the compression mechanism section. A second suction pipe is arranged outwardly from the first suction pipe so as to connect the accumulator to the second cylinder of the compression mechanism section.

Abstract: The invention is directed to a method for the operation of a twin shaft vacuum pump (1) having two rotors (4, 5; 6, 7; 8, 9) that rotate synchronously and in non-contacting fashion in a pump chamber, each being provided with a respective projection (38) and a recess (39), the one of said rotors controlling an admission opening (32, 35) and the other controlling a discharge opening (33, 37, 42); the invention is also directed to a twin shaft vacuum pump suitable for the implementation of the method; in order to be able to admit flushing gas into a twin shaft vacuum of this species during operation as well, it is proposed that flushing gas be admitted into the respectively diminishing pump volume via an orifice (45) that is controlled such by the rotor at the discharge side that the respective pump volume is closed both toward the admission opening (35) as well as toward the discharge opening (42) at the moment the flushing gas is supplied.