Abstract: A vane pump includes a rotor chamber; a rotor eccentrically accommodated in the rotor chamber; a plurality of vanes attached to the rotor, each vane having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber. The vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor, and the vanes; an inlet port through which a working fluid is drawn into a working compartment; and an outlet port through which the working fluid is discharged from a working compartment. An engaging portion is formed in a peripheral end portion of a thrust surface of the rotor and an engaged portion with which the engaging portion engages in a non-contact state is formed in an inner surface region of the rotor chamber facing the thrust surface of the rotor in a non-contact state.

Abstract: A modular constructed surgical motor with an outer cylindrical case used as the handle, and a spaced inner motor case resiliently mounted thereto forms an air gap for reducing vibrations and heat, a separate module houses the chuck, a ball coupling made from an elastomeric material transmits rotary motion, undercuts in the spindle adjacent the vanes and in the peripheral edge enhance power, the inlet opening to the vanes are positioned to increase the volume of inlet air, the inner surface of the cylinder is contoured to define a crescent seal, the inlet and outlet to the spindle are positioned in the cylinder to increase the power stroke, the discharge holes in the cylinder are oriented for uniform contact surface, the flow passages in the cylinder cool the cylinder and bearing, and one seal cured in situ and another seal adjacent the bearing prevent leakage of oil into ambient and the surgical tool.

Abstract: Besides the conventional pump timing in rotary hydraulic devices, a series of constant and variable restrictions have been applied to condition the pressurized flow used to internally precompress the volume or volumes to be displaced. This multiple staged orifices feature reduces the outgassing associated with the pressurized flow passing through a single restriction, such as a metering groove. The pressurization of the outgassed fluid will cause noise and erosive wear of the pump internal containment surfaces.

Abstract: A static-fluid-pressure-driven rotary motor includes a casing, which defines a chamber having a fluid inlet and a fluid outlet, and at least one rotor assembly rotatably mounted within the casing. The rotor assembly includes a rotor, a plurality of barrier elements associated with, and extending outwards from, the rotor, and a resilient seal associated with at least an outer edge of each of the barrier elements. As the rotor turns about its axis of rotation, the outer edges of the barrier elements passing in proximity to a facing wall of the casing chamber against which the resilient seals for a sliding seal while accommodating variations in clearance between the outer edge of the barrier element and the facing wall of the casing.

Abstract: An impeller for a vane cell pump includes, but is not limited to vane receptacles for receiving an at least radially movable pump vane. A chamber wall is formed between two adjacent vane receptacles to form a conveying chamber. The chamber wall has an axially projecting web for delimiting a movement of a position ring with respect to the radial movement of the pump vane. The chamber wall includes, but is not limited to a first wall region for secure receiving of the respective pump vane in the vane receptacle. The chamber wall further includes, but is not limited to a second wall region for forming a web thickness d of the web for secure abutment of a sintering tool. In addition, the chamber wall has a third wall region for forming an enlarged conveying chamber volume. As a result, the impeller is easily manufactured and has an enlarged pump capacity for the same installation space.

Abstract: A magnetic rotary vane pump is disclosed which includes a rotor disposed within a casing that comprises a cavity having an inlet and an outlet. The rotor includes at least one radial slot and at least one vane carried by the radial slot. The vane includes an inner edge directed towards a central axis of the rotor and an outer edge directed towards the casing. The inner edge of the vane is connected to a first magnet. The slot in the rotor includes an inner wall that abuttingly engages or faces the inner edge of the vane when the vane is fully received within the slot. The inner wall of the slot is connected to a second magnet. The two magnets are arranged so that like pole of the magnets face each other thereby biasing the vane out of the slot and against the inner wall of the casing as the rotor rotates. Accordingly, no spring or pin is required to bias the vane outward against the casing or into recesses or slots disposed in the casing wall.

Abstract: A marine outdrive has a hydraulic vane motor with a spool shaped rotor eccentrically mounted in a fusiform shaped housing. The resulting increased vane area results in greater torque and speed.

Abstract: A vane pump includes a rotor accommodated in a rotor chamber; a plurality of vanes attached to the rotor, each of the vanes having a leading end adapted to make sliding make a contact with an inner peripheral surface of the rotor chamber. Further, the vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor and the vanes, the working compartments being adapted to undergo a volume change as the rotor is rotatably driven; an inlet port through which a working fluid is drawn into a working compartment whose volume is being increased; and an outlet port through which the working fluid is discharged from a working compartment whose volume is being decreased; and one or more blade base members protruded from portions on the outer peripheral surface of the rotor between the vanes adjacent to each other.

Abstract: A vane pump includes a rotor chamber; a rotor accommodated in the rotor chamber; a plurality of vanes attached to the rotor, each vane having a leading end adapted to make sliding contact with an inner peripheral surface of the rotor chamber. The vane pump includes working compartments surrounded by inner surfaces of the rotor chamber, an outer peripheral surface of the rotor and the vanes; an inlet port through which a working fluid is drawn into a working compartment; and an outlet port through which the working fluid is discharged from a working compartment. A cutout portion is formed in a leading end portion of each vane on each of at least one of a leading and a trailing side of the leading end portion, the leading end of each vane having a width smaller than that of a base end portion of each vane.

Abstract: A gas compressor includes a housing with suction and discharge ports, and a gas-compressing mechanism housed in the housing to compress a gas sucked through the suction port and discharge the compressed gas via the discharge port. The mechanism includes a cylinder defining a cylinder chamber with a circular or elliptical cross-sectional shape. The cylinder has a suction inlet and a discharge outlet. The suction inlet and the discharge outlet are opened in a peripheral wall of the cylinder chamber. A suction passage is formed along an outer periphery of the cylinder corresponding to a peripheral direction of the cylinder chamber. A discharge passage extends inside a thick portion of the cylinder along a center axis of the cylinder chamber. The suction inlet communicates with the suction port via the suction passage. The discharge outlet communicates with the discharge port via the discharge passage.

Abstract: A vane pump according to the present invention is characterized in that a position of a first suction port located in the forward rotation direction of a rotor is brought closer to a suction port than a position of a second suction port located in the backward rotation direction of the rotor with the suction port as reference by positioning a side plate in the state where the discharge port is brought close to a mounting portion.

Abstract: Disclosed is a fixed vane type hydraulic motor in which a steady output can be obtained and rotation speed of an output shaft can be varied. The hydraulic motor includes a main body having an actuating space provided therein, a fluid passing device to make the fluid flow toward the main body and a horizontal rotation body, a fluid compulsorily circulating device to compulsorily circulate the fluid through the respective fluid chambers, and an oblique rotation body having a rotation plate which is rotatably mounted to the opened opposite side of the main body and to the horizontal rotation body by a fixing device.

Abstract: The disclosure relates to a vane cell pump having an inner rotor (12) and a plurality of vanes (18) which are secured in a pivotable manner to the external rotor (28) and which are displacably mounted in a radial manner in the inner rotor, essentially in radial slots (16). The external rotor is formed on guide blocks (22). Said guide blocks are guided, with the axial front sides thereof, on the guiding path and are guided along the internal circumferential surface of a stator (26). The guiding path is arranged in a guide ring (36).

Abstract: A surgical pneumatic motor is designed to be used with or without an MRI machine without affecting or influencing the magnetic characteristic of the MRI machine. The motor includes an improved vane motor with undercuts in the spindle to increase the power faces of the vanes and spindle itself, the holes in the cylinder are modified to increase the sealing area between the spindle. The inlet cylindrical holes and the cylinder holes and grooves are arranged to enhance the life . Wear of the edge of the vanes is decreased by the judicious location of the discharge holes. The bearings are cooled by bypassing a portion of cylinder air before re-entering the air. The noise is attenuated by a cris-cross plug in the hose the temperature of the handle is reduced by a serrated sleeve. Slipping discs in the seal serves to enhance seal life.

Abstract: The present invention is directed to a peripherally pivoted oscillating vane machine (OVM). The OVM has been optimized for performance and efficiency. This has been accomplished by reducing loads on the drive mechanism and by employing de-phased motion of the peripherally pivoted vanes in conjunction with improved porting configurations as well as valve actuation and manufacture.

Abstract: Provide a vane compressor which starts the compression without delay, and which prevents the vanes from chattering under the start-up operation. To this end, the vane compressor 1 includes: a cylinder chamber 3; a rotor 5 rotatably arranged in the cylinder chamber 3; vane grooves 7 provided in the rotor 5 at equal intervals in the circumferential direction thereof; vanes 9 arranged in the vane grooves 7 in a way that the vanes 9 are capable of protruding to, and retracting from, the cylinder chamber 3; and the vane back-pressure chamber 11 communicating with the bottom portions of the vane grooves 7, and configured to apply the back pressure to the vanes 9; and a back-pressure supplying unit 13 configured to transmit the pressure to the vane back-pressure chamber 11, and to push up the vanes to the sliding surface of the cylinder chamber 3 once the activation mode for rotating the rotor 5 is selected.

Abstract: The invention relates to a vane-type machine. The housing has a largely cylindrical space for accommodating the vane cells and an inlet opening and an outlet opening. A shaft is eccentrically arranged in the housing. A first and a second guide plate arranged largely parallel to one another are provided on the shaft. Slides displaceable largely radially to the shaft in the direction of the inner wall of the housing are guided by the guide plates, wherein a vane cell is formed with the participation of two respective adjacent slides of the adjacent region of the inner wall of the housing and the volume of the vane cells in the region of the inlet opening differs from the volume of the vane cells in the region of the outlet opening.

Abstract: A vane-type fluid displacement unit having a housing, a drive shaft extending through the housing, a rotor secured to the drive shaft and disposed within the housing, the rotor having at least one non-smooth top or bottom surface, and at least one vane secured to the rotor.

Abstract: A pump, in particular a sliding-vane pump, a roller cell pump, or a gear pump includes a rotating assembly, with, amongst other things, a rotor with radially-sliding vanes, rollers or gears and a drive shaft is provided. The rotor or a gearwheel is connected to the drive shaft by a toothing on the drive shaft and on the rotor gearwheel for rotational drive.

Abstract: The invention relates to a vane pump comprising a rotor which is arranged therein, rotatably driven by a drive shaft. The rotor is provided with several grooves which are distributed through the circumference thereof and which extend substantially radially with respect to the axis of rotation of the rotor. In each groove a blade-shaped conveying element is slidingly guided. The end walls of the pump housing are adjacent to the rotor in the direction of the axis of rotation thereof. At least one ring-shaped groove surrounding the axis of rotation of the rotor is embodied in at least one front side of the rotor. The ring-shaped groove is connected to lower areas restricted by the blades in the grooves of the rotor, and to pressure areas. In a preferred embodiment, the ring-shaped groove is formed in the rotor by shaping.

Abstract: A pump assembly (100) having a pump housing (206 and 208) and a rotor (222) rotatingly disposed within the housing, the rotor having a plurality of slots (226). The pump assembly includes a plurality of vanes (224), each vane moveably disposed in one of the plurality of slots, and an input shaft (228) coupled to the rotor for applying a torque to the rotor. The pump assembly (100) also includes a prime mover (400) for generating a torque and a magnetic coupling unit (300) for magnetically transferring the torque generated by the prime mover to the input shaft. The vanes may have a leg (256) which extends radially inward from a blade (254). The rotor and input shaft may be integrally formed.

Abstract: A magnet drive rotary vane pump has a casing with a pump cavity. A rotor carrying a plurality of vanes is disposed within the pump cavity to be rotatable about an eccentric axis with respect to the pump cavity for drawing the fluid into the pump cavity and expelling it out of the pump cavity. The rotor is configured to have a rotor magnet which is magnetically coupled to a stator magnet mounted on the casing outwardly of the pump cavity for driving the rotor. The rotor magnet is configured to have its major portion disposed in an overlapping relation with the stator magnet. Thus, the rotor magnet can be mechanically isolated from the stator magnet disposed outside of the casing to establish a sealless coupling therebetween for realizing leakage free pump.

Abstract: A rotary vane pump (200) for pumping a fluid. The rotary vane pump includes a pump housing (206 and 208) and a rotor having a plurality of dividing members (232) and a plurality of slots (226) disposed between adjacent dividing members. The rotary vane pump also includes a plurality of strengthening members (240), each strengthening member disposed in one of the plurality of slots and coupled to adjacent dividing members. The rotary vane pump also includes a plurality of vanes (224), each vane moveably disposed in one of the plurality of slots.

Abstract: A rotor structure of pneumatic grinder, including a rotor main body and at least one reinforcing plate. The rotor main body is formed with a central shaft hole for a rotary shaft to pass through. Several radial projecting sections are formed on outer circumference of the rotor main body at equal intervals. Each projecting section has a depression for reducing the weight of the rotor structure. A split is defined between each two adjacent projecting sections. A vane is inserted in each split. The reinforcing plate is coaxially embedded in the rotor main body. The reinforcing plate outward radially expands from the axis of the rotor main body for increasing the strength of the rotor main body.

Abstract: The rotary machine can be used as a rotary internal combustion engine and as a pneumatic or hydraulic pump. The rotary machine comprises a housing in the form of two intersecting cylinder parts of different diameters having parallel axes. A rotor is received in the housing coaxially with the smaller-diameter cylinder and comprises at least two segmental rotor parts provided with annular rotor covers. At least two pairs of annular elements are provided engaging with the segmental rotor parts. Pivotal elements are interposed between the annular elements of each pair. A driving member is accommodated movably in the openings of the pivotal elements. The axis of rotation of the driving member is coincident with the axis of the larger-diameter inner cylindrical surface of the housing.

Abstract: A shaft-hub connection for transferring a torque between a shaft (1) and a hub (3) with the aid of at least one drive element (2). To enable a torque transfer which is practically resistant to wear, even under the effect of transversal forces, the contact surface between the shaft and the hub and/or between the shaft and the drive element and/or between the hub and the drive element is minimized in the axial direction thereof.

Abstract: A body bore 2 formed in a body 1 is closed with a cover 9, as well as a cam ring 4 is incorporated into the body bore 2, and a rotor 6 is arranged inside the cam ring 4. Vanes 7 move in and out along an inner surface of the cam ring 4 with rotation of the rotor 6. An iron reinforcing plate 8 is interposed inside the body bore 2 between the cam ring 4 and the cover 9.

Abstract: A high-efficiency vane rotary expander is provided, which prevents a loss due to incomplete expansion or overexpansion from occurring because the volume of an operating chamber may vary. This is done by forming a plurality of discharge ports (28, 29, 48, 49, 50) in an inner wall (21a, 41a) of a cylinder in the circumferential direction, placing, among these discharge ports, the discharge port (28, 48), to which the operating chamber (25, 45) connects at the initial stage of the discharging process, at a position of {180×(1+1/n)} degrees from a small clearance (22, 42) defined between the cylinder (21, 41) and the rotor (23, 43) in the direction where a shaft rotates, and providing a valve mechanism (30a, 30b, 51a, 51b, 52a, 52b).

Abstract: A rotary vane suction pump that includes a housing that defines a pump chamber. A shaft is rotatably mounted to the housing. A rotor is fixed to the front end of the shaft to rotate in unison with the vanes. The vanes that form the fluid cavities, into which the fluid is drawn into and discharged from, are seated in radially directed slots that extend longitudinally, end-to-end along the length of the rotor. Discs located at the opposed inboard and outboard ends of the rotor are mounted to the shaft and rotor to turn in unison with the rotor. The discs have diameters greater than that of the rotor and the pump chamber. The discs thus close the ends of the pump chamber and the ends of the slots in which the vanes are seated.

Abstract: In a vane pump disposed inside a transmission case of a continuously variable transmission, a pump case (20), a pump drive shaft (8) rotatably supported by a shaft bore (9) of the pump case (20) to rotate a rotor (5), and a drain port (17), one end thereof being opened to a shaft bore (9) of the pump drive shaft (8) and the other end being opened to an outside of the pump case (20) are provided. A leaked oil flown via the drain port (17) from a pump discharge side is discharged to an outside of the pump case (20).

Abstract: A vane pump includes a casing having a cylindrical inner bore and a rotor disposed in the inner bore with an eccentric relation thereto, forming a circular pump chamber between the rotor and the inner bore. The circular pump chamber is divided by vanes held in the rotor into pump chambers changing their capacities according to rotation of the rotor. A gravity center of the rotor is shifted from the rotational center of the rotor by removing or adding some weight, so that an imbalanced centrifugal force is applied to the rotor. The driving shaft and the rotor are tightly coupled to each other by the imbalanced centrifugal force even if there is a small gap or dimensional errors therebetween.

Abstract: A vane pump can effectively utilize the total quantity of a working fluid delivered from a vane section. The pump can be used for fluid pressure operated equipment requiring a high flow rate, does not create torque loss due to a throttle valve, and can prevent the occurrence of cavitation caused by a shortage of suction. The vane pump pressurizes and delivers a working fluid through a vane section. A returning working fluid flowing through a return port is throttled and accelerated by a throttle valve, and a working fluid sent from a suction port is attracted by the accelerated returning working fluid so that the returning working fluid and the working fluid sent from a tank are sent into the vane section.

Abstract: A vane-type hydraulic motor includes a rotor (30) having a main shaft (70) and a plurality of vanes (35), a cam casing (10) having a chamber (11) for rotatably housing the rotor (30), a first port (13) and a second port (15) for supplying a working fluid into the chamber (11) and discharging the working fluid from the chamber (11). A bypass path (80) is provided for allowing the working fluid to flow from bearing portions (51, 61) supporting the main shaft (70). A drain port (17) is provided for discharging the working fluid to the exterior.

Abstract: A cylinder to a vane motor is designed to include cylindrically shaped inlet and outlet holes, an axial passage that includes a blocked upstream portion that bypasses the upstream inlet holes, spaced circumferentially slots for leading a portion of the pressurized air into the inlet holes, discharging the portion of pressurized air from the axial passage into an annular cavity to bathe the bearing in the cooler pressurized air, and recirculating the portion of pressurized air through another axial passageway to flow into all of the inlet holes. The discharge holes are judiciously oriented in a particular pattern to assure that the edge of the vanes wear uniformly. The inlet holes are spaced from the pinch point of the spindle to cylinder to permit an increased volume of pressurized air to enter the vane motor and the outlet holes are spaced to maximize the power stroke of the vane motor.

Abstract: The spindle of a vane motor is designed to enhance the power, speed and torque by undercutting the spindle adjacent to the vanes on the power stroke side to increase the working area of the vanes and by adding slots intermediate the vane formed in said spindle and each slot has a working face for accepting pressurized air during the power stroke. The slots are located out of coincidence with the rotating axis of the spindle and the vanes include a contoured bottom edge fitted into the slots so as to enhance its ability to be retracted in opposition to centrifugal force created by the rotating cylinder.

Abstract: A rotor includes a plurality of vanes and is connected to a rotatable shaft of a motor arrangement. A casing includes a pump chamber and elongated holes. The pump chamber receives the rotor in such a manner that the rotor is eccentric to the pump chamber. Each elongated hole penetrates through the casing and has an elongated cross section. A major axis of the elongated cross section of each elongated hole extends in a direction of eccentricity of the rotor relative to the pump chamber. Each bolt is received through a corresponding elongated hole of the casing and is threadably engaged with a mount to connect the casing to the mount. The casing holds each bolt in a minor axial direction of the elongated cross section of the corresponding elongated hole to limit substantial movement of the male threaded screw member in the minor axial direction of the elongated hole.

Abstract: A vane pump includes a motor arrangement, a rotor, a casing and bolts. The motor arrangement includes a mount. The rotor includes vanes and is rotated by the motor arrangement. The casing has opposed first and second end surfaces and makes flat surface contact with the mount at the second end surface thereof. The casing includes a pump chamber, receiving through holes and second end side recesses. The pump chamber receives the rotor. The receiving through holes penetrate through the casing. The second end side recesses are recessed in the second end surface of the casing. The second end side recesses are spaced away from the receiving through holes. Each bolt is received through a corresponding one of the receiving through holes of the casing, and each bolt is threadably engaged with the mount to connect the casing to the mount.

Abstract: A rotary piston pump for fluids, wherein the ends of the housing are configured so as to provide reduced pressure differentials between opposite sides of the rotor end disks.

Abstract: A vane pump is composed of a casing having a cylindrical inner bore and a rotor disposed in the inner bore with an eccentric relation to the inner bore. A circular pump chamber formed between the rotor and the inner bore is divided by vanes disposed in the rotor into plural pump chambers each changing its capacity according to rotation of the rotor. The vane is slidably disposed in a groove formed in the rotor in a slanted relation with respect to a rotational axis of the rotor. When the rotor rotates, the vane is pushed backward of the rotational direction by fluid in the pump chamber. The pushing force includes a component for pushing the vane upward toward an upper plate closing an upper opening of the inner bore. The vane is pushed against the upper plate to thereby prevent hitting noises between the vane and the upper plate.

Abstract: A rotary vane compressor having features for reducing sound emitted from the compressor during operation. The sound reduction features include and relate to specific components of the compressor. Specifically the features relate to (1) the compressor motor; (2) a non-vented motor housing and back or closure; (3) the inlet ring; (4) the bearing system; (5) the rotor and vane positioning and vane weight or mass; (6) the mass of the body within which the rotor and vane rotate; and (7) a shroud which surrounds the body which is solid and non-vented solid and may be formed of a laminated material having a sound dampening core layer.

Abstract: The invention relates to a compressed air motor comprising a housing and a rotor rotatably mounted therein, the rotor being provided with substantially radial slots and plate-like vanes being mounted in the slots so as to be radially displaceable by the centrifugal force, and variable, all-round air chambers being formed between the housing and the outside of the rotor. The vanes are surrounded on the outside by a rotatable sleeve which is provided with at least one passage for the compressed air.

Abstract: A rotary vane suction pump that includes a housing that defines a pump chamber. A shaft is rotatably mounted to the housing. A rotor is fixed to the front end of the shaft to rotate in unison with the vanes. The vanes that form the fluid cavities, into which the fluid is drawn into and discharged from, are seated in radially directed slots that extend longitudinally, end-to-end along the length of the rotor. Discs located at the opposed inboard and outboard ends of the rotor are mounted to the shaft and rotor to turn in unison with the rotor. The discs have diameters greater than that of the rotor and the pump chamber. The discs thus close the ends of the pump chamber and the ends of the slots in which the vanes are seated.

Abstract: A vane motor is modified to increase the sealing effectiveness of the gap made at the interface of the spindle and cylinder by undercutting the cylinder a predetermined amount and distance so as to increase the effectiveness of the spindle to cylinder gap and to decrease the requirements for lubrication of the vane motor.

Abstract: A rotary pump includes a stator housing and a rotor. The stator housing preferably has an oblong inner surface. The rotor, which is disposed in the stator housing, preferably has a substantially circular outer surface within which a plurality of vane slots are defined. A first chamber is defined between a first half of the oblong inner surface and the outer surface of the rotor. Similarly, a second chamber is defined between a second half of the oblong inner surface, diametrically opposite the first half, and the outer surface of the rotor. Resting within each of the plurality of vane slots is a corresponding sliding vane. A first inlet port and a first outlet port each provide access to the first chamber. Similarly, a second inlet port and a second outlet port each provide access to the second chamber. At least one of the vanes separates each of the first inlet port, the first outlet port, the second inlet port and the second outlet port from one another.

Abstract: A rotary fluid machine is provided in which a rotating shaft (113) fixed to a rotor (41) is rotatably supported on a fixed shaft (102) fixed to a casing (11), sliding surfaces of the fixed shaft (102) and the rotating shaft (113) are lubricated by a first pressurized liquid-phase working medium, and sliding surfaces of the rotor (41) and a vane (48) are lubricated by a second pressurized liquid-phase working medium.

Abstract: The present invention relates to a vane-type rotary machine suitable for use in applications where a low-viscosity fluid such as water is used as a working fluid. According to the present invention, a vane-type rotary machine having a rotor (11) mounted with vanes and rotatably housed in a cam casing (10) includes a motor supply opening (or pump discharge opening) (30) for a working fluid, a motor return opening (or pump suction opening) (20) formed in the cam casing for a working fluid, and branch flow passages (23, 25, 33 and 35) branched from the motor supply opening (or pump discharge opening) and the motor return opening (or the pump suction opening) and communicating with vane chambers (22, 24, 32 and 34). The distances of the branch flow passages are identical to each other.

Abstract: In a vane pump, a rotor chamber is defined within a housing that includes a ring and first and second plates. An inlet is communicated with the rotor chamber through an intake groove, and an outlet is communicated with the rotor chamber through a discharge groove. A rotor, which has a plurality of radially reciprocable vanes, is rotatably received in the rotor chamber, and a plurality of volume variable pump chambers is defined by the vanes between an inner peripheral wall surface of the housing and an outer peripheral surface of the rotor. The discharge groove includes a first end and a second end, and the second end is positioned away from the first end in the rotational direction of the rotor. The outlet extends directly from the second end of the discharge groove.

Abstract: Devices and methods of use of such devices for pumping fluid and for use in surgical procedures preferably include vacuum-driven pumps for providing irrigation and suction functions to the surgical field. Such pumps may be freestanding, external to or integrated into handpieces of the surgical instruments.

Abstract: A gas compressor has a cylinder in which a refrigerant gas is compressed and a side block mounted to an end surface of the cylinder. The side block has suction holes each having a first end opening to an outer surface of the side block and a second end opening into the cylinder. A front head has a suction port, an inner surface, and a hollow portion disposed in the inner surface. The front head is disposed on an outer surface of the side block so that the hollow portion and the outer surface of the side block form suction passages extending from the suction port to respective suction holes of the side block. Each of the suction passages form a main flow passage along which refrigerant gas flows from the suction port to a corresponding one of the suction holes of the side block. The hollow portion has a generally flat wall surface at a region corresponding to each of the main flow passages.

Abstract: A vacuum vane pump for generating a vacuum condition for aircraft instruments includes a rotor having a peripheral surface eccentrically mounted in a housing having a confrontingly opposed inner surface so that the opposed surfaces define a crescent-shaped chamber. The rotor has a plurality of radial slots, each of which receives a vane which is slidably displaced radially outwardly along the slot as the rotor is rotatively driven so that the outer tips of the vanes are pressed in frictional abutment with the inner surface of the housing. Each slot has a radially inward facing shoulder and each vane has a corresponding radially outward facing shoulder for mutual contact engagement when the tip becomes worn to a predetermined degree.