Abstract: A two-speed gerotor motor is disclosed of the type including a rotary disc valve member (55) of the type including valve passages (71 and 69) communicating between the inlet and outlet ports (61 and 65), respectively, and the fluid passages (57) defined by the port plate (19). The valve (55) also defines control valve passages (73) which communicate with an annular groove (75). Adjacent the valve member (55) is a valve seating mechanism (83) including a balancing ring member (85) which defines a plurality of axial passages (89) providing communication between a control fluid port (77) and the annular groove (75). As a result, the control valve passages may be communicated selectively with either the expanding volume chambers (29E) or the contracting volume chambers (29C).

Abstract: A sliding-vane type oil free rotary compressor comprising a rotary sleeve rotatably mounted in a center housing, a rotor eccentrically contained in the rotary sleeve, and a plurality of vanes movably fitted in the rotor. The rotary sleeve and the center housing are arranged to define an annular pressure chamber between their inner and outer surfaces. A part of the compressed fluid is introduced to at least a high-pressure passage and then injected therefrom to the pressure chamber through a throttle to produce dynamic pressure for floatingly supporting the rotary sleeve.

Abstract: A capacity control arrangement for a rotary vane fluid displacement apparatus, such as a rotary vane compressor, having a vane retaining means that may be moved to engage and retain the vanes in their retracted or nonworking position within the rotor defined guide slits. The retaining means are actuated to the vane-engaged position by hydraulic control fluid which is communicated to the retaining means in response to an external parameter sensed by a control means.

Abstract: A positive displacement machine such as a hydraulic pump or motor comprises a screw with several threads rotatable inside a casing and meshing with at least one pinion, and at least one low pressure port and at least one high pressure port located in the casing on either side of the pinion. The portion of the casing comprised between a low pressure port and a high pressure port is in leaktight contact with the whole length of the top of at least one thread of the screw. When said portion is in contact with the tops of two threads, no pinion tooth is in mesh between them. The threads terminate on each side of the screw on substantially equal diameters and have in their central section a swollen portion with an external diameter larger than at the ends of the threads.

Abstract: In a pneumatically powered portable tool there is provided a speed governor and an overspeed safety device the purpose of which are to ensure a predetermined maximum speed by controlling the air inlet flow to the motor. A cup-shaped shell insert (28) is detachably mounted in the housing (10) to form with the latter an air supply passage (58) and to support the valve means (51,53) of the overspeed safety device. The top surface of the shell insert (28) is exposed through an aperture (57) in the housing (10) and carries the maximum speed marking of the tool.

Abstract: The rotary expander device combines a square working chamber with a three lobed sext-arcuate rotary working member which defines four expansible and contractible spandrel chambers in the corners of the square as the three lobed rotor revolves and its external surfaces make wiping contact with the interior surfaces of the square working chamber. Fluid flow from exterior intake and exhaust ports to four ports in the spandrel corners is controlled by a rotary valve coupled to the drive shaft, which is coupled to the center of the rotor. The ports and valving provide sequential spandrel chamber expansion and contraction with intake and exhaust of fluid as the sext-arcuate rotor revolves with its center describing a retrograde circular orbit around the center of the square chamber. The device may serve as either a motor when fluid driven or a pump when shaft driven.

Abstract: A planetary hydraulic motor comprises a housing (1) with a stator gear (2), the housing accommodating a shaft (3) having fixedly secured thereon a gear (4), a ring rotor (11) disposed eccentrically relative to the shaft (3) and two cover cups (5 and 6). The shaft (3) has a sealing assembly in the form of a thrust ring (7) secured in the cover cup (5) and a sleeve (8) having a cylindrical projection adjoining by the end face thereof the working surface of the thrust ring (7). Mounted on the outer surface of the cylindrical projection of the sleeve (8) is a ring element (20) fabricated from an elastic material. Provided in the sleeve (8) essentially under the ring (20) are passages (21) adapted to communicate a section of the inner surface of the ring (20) with the atmosphere.

Abstract: A horizontal hermetic type rotary compressor to be used in a refrigerator, air conditioner, or the like comprises an outer hermetic casing provided at both ends with suction and discharge pipes for a gaseous refrigerant, a compression device contained in the casing and a motor operatively connected to the compression device in the casing. The compression device has a cylinder body on both sides of which main and sub-bearings are attached and a silencer is provided for the cylinder body. The silencer comprises a plurality of silencer chambers formed in casting in the cylinder body at portions outside of the peripheries of the bearings and communicated with each other and a pair of cover plates secured to the cylinder body by tubular rivets so as to hermetically seal openings of the silencer chambers on both sides of the cylinder body.

Abstract: A vane-piston pump having a rotor supported eccentrically in a pump housing. The rotor is provided with slits for the passage through it of the vanes, and sealing strips are disposed at either side of the slits. The vanes slide along these sealing strips. Each sealing strip is subjected to the force of its own spring, and under the force of this spring, each sealing strip is pressed against the vanes.In this manner the spring forces can be kept smaller, so that friction is reduced. The vane-piston pump is preferably used in motor vehicles for generating compressed air in order to operate exhaust-gas treatment apparatus.

Abstract: A rotary valve for changing the connections of the fluid inlet passages and the fluid outlet passages of a Gerotor type fluid rotary machine in which the fluid is contracted and expanded by a plurality of cavities defined by the teeth formed on a stator and a rotor in response to the orbital rotation of the rotor formed with one less external tooth than the number of the internal teeth on the stator. The rotary valve selectively communicates the fluid passages with the Gerotor cavities by means of its rotary commutator which orbits with a phase difference of 90.degree. with respect to the Gerotor rotor, and the commutator is rotatably accommodated in a spacer disposed between an end cover and a port member having a plurality of fluid passages. The clearance at each side of the commutator is permanently determined by means of the width of the spacer.The commutator comprises spaced members that move in unison with a sealing ring interposed between the two members.

Abstract: A variable displacement vane pump has a ported casing (10), a rotor (28) and a first (32a) and second (32b) plurality of vanes. The ported casing (10) has a pair of relatively rotatable, complementary cams (18, 20). Each cam has a surface shaped to provide a curvilinear annular track (18a, 20a). The rotor (28) is rotatably mounted in the casing (10). The vanes (32a, 32b) are slidably mounted upon the rotor (28). Each of the vanes (32a, 32b) are sized and positioned to engage a corresponding one of the pair of cams (18, 20). The vanes of the first plurality (32a) of vanes engage one of the cams (18), the other cam (20) being engaged by the vanes of the second pluarlity (32b). Thus constructed, the vanes (32a, 32b) can move in pairs in a closed path within the casing (10). The vanes (32 a, 32b) of each pair can ride on different ones of the cams (18, 20). By rotating the cams (18, 20) with respect to each other, the phasing of the vanes (32a, 32b) in each pair can be altered.

Abstract: A control ring in sliding contact with the radially outer ends of fluid displacing vanes on a pump rotor, is angularly adjustable about a pivot formation in a pump housing on one radial side of the rotor opposite a limited sealing surface on the housing having a center of curvature on the rotor axis. A sealing element pivotally mounted on the control ring is biased into wiping contact with the sealing surface to divide the pump housing into inlet and outlet pressure chambers.

Abstract: A rotary pump including a circular case, and mating cover forming a cylindrical cavity, an outer ring sized for rotating within the case cavity, a partial inner ring sized for relative rotation within the outer ring, and a driven elongated blade pivotally interlocked at one end to the inner ring. The other end of the blade is held for pivotal and sliding movement to the outer ring by a mating knuckle which slidably receives the blade end while being pivotably locked into the ring. The axis of the drive shaft which rotates the blade is positioned off-center from that of the concentric sealing rings and case. Fluid entrance and exhaust ports may be provided in either or both the case and mating cover.

Abstract: A rotary machine, particularly a planetary gear motor, has a control plate 4, two annular channels (18, 19) which are arranged on the inner circumference of a cup-shaped housing section 7 and stationary commutators (8, 9) which are arranged side by side adjacent the annular channels. The control channels are coupled together when the transit channel 15 and when the plate and one of the annular channels are aligned with an open corner channel 16 and alternately with the annular channels. A simply shaped and simply manufactured commutator includes two like-formed disk-shaped commutators, which completely intersect alternately with each other. Transit channels 15 are provided and, with the plate cam and one of the annular channels, open into corner channels 16. Both commutators are arranged in such a way that at times a transit channel of a commutator adjoins a corner channel of the other commutator and vice versa.