Abstract: A vane of a compressor is made of solid phase sintering material of which a sintering density is not less than 7.2g/cm.sup.3 and a hollow rate is not more than 10%, and to which CrN phase is adhered through a PVD process. A roller of the compressor is made of hardened and tempered material having a hardness equal to cast iron FC300 (specified by JIS). The roller may be made of hardened and tempered material including at least one of Ni, Cr and Mo, and having a hardness equal to cast iron FC300. The vane and roller are combined, so that a sliding section having excellent abrasion-resistance can be constructed. As a result, a rotary compressor, which employs R134a or R22 coolant as well as HFC system or HC system coolant both of which are R22 substitutes, having extremely high reliability can be realized.

Abstract: A rotor 1 forming screw teeth is projectingly provided at its outer end 2 on the axis thereof with a center shaft 3. The center shaft 3 is provided at its outer end 4 with a smaller-diameter shaft 5 or a concaved fitting hole. A separate rotor shaft 6 which is to be fitted over the smaller-diameter shaft 5 or fitted into the concaved fitting hole is provided with another concaved fitting hole 7 or smaller-diameter shaft. A metal shaft around which synthetic resin is molded is formed at its peripheral surface with a spiral groove or corrugated groove in the opposite revolutional direction with respect to the revolutional direction of the screw rotor. The spiral groove is formed with smooth arc curved line connecting profiles of adjacent grooves. The shaft is provided with a step, and synthetic resin is molded around the shaft surface to form a screw rotor.

Abstract: A scroll-type fluid displacement apparatus comprises a housing having an inlet port and outlet port and is made of non-ferrous metal. The housing has a first casing and second casing that is connected to the first casing. A fixed scroll is fixedly disposed within the housing and has a first circular end plate from which a first spiral element entered into the housing. An orbiting scroll has a pair of parallel first grooves formed on a second circular end plate. A second spiral element extends from the second circular end plate such that the first spiral element interfits the second spiral element at an angular and radial offset to make a plurality of line contacts to define a pair of fluid pockets within the housing. A driving mechanism is connected to the orbiting scroll to effect orbital motion of the orbiting scroll. An Oldham ring is coupled to the orbiting scroll for preventing rotation of the orbiting scroll during orbital motion.

Abstract: A vane actuation mechanism for an axial vane rotary device includes a cylindrical outer housing that defines an internal cylindrical chamber. A rotor assembly having a drive shaft is rotatably mounted within the internal cylindrical chamber. A cylindrical guide slot is held in proper rotational position within the internal cylindrical chamber. A plurality of modified vanes are disposed on the rotor core. The modified vane has a recess in the top of the vane. A shear block having a general "T" shape is disposed in the recess of the vane and is secured to the vane. Part of the shear block is disposed within the guide slot to act as a guide member. The guide slot can be formed from a single cylindrical member. The single cylindrical member is cut to form two cylindrical guide slot members. The edges of the cylindrical guide slot members form the guide slot. The guide slot urges the shear block as the vanes rotate.

Abstract: A rotary vane motor adapted to operate at low rpm with a source of cryogenic pressurized gas. The rotary vane motor includes a housing having a cylindrical opening connected to a primary inlet assembly and an outlet assembly, a first and second end plate attached at opposite sides of the cylindrical opening, a rotor having a plurality of radially oriented, a plurality of vanes movable within the slots and a shaft for rotatably mounting the rotor in an eccentric position within the cylindrical opening. The first end plate includes a slot positioned for fluid communication with at least one of the rotor slots so as to direct pressurized fluid from a secondary inlet assembly. In the preferred embodiment, each of the plurality of vanes includes grooves for facilitating release of trapped fluid. During use, pressurized gas from the secondary inlet assembly forces the vanes radially outward relative to the rotor slots upon communication with first end plate slot such that any friction-causing problems are overcome.

Abstract: An aluminum alloy scroll machine component having improved lubricity.

Abstract: A member is disclosed which includes a hard carbon film provided through an interlayer or directly on a main body such as a vane. A mixed layer is formed within the main body or interlayer adjacent to an outer surface of the main body or interlayer. The mixed layer contains carbon and a constituent element of either the main body or the interlayer. The mixed layer has a carbon content gradient in its thickness direction so that a carbon content in a thickness portion thereof closer to an outer surface of the mixed layer is higher than in a thickness portion thereof remoter from the outer surface of the mixed layer.

Abstract: An internally or externally geared pump for conveying fluids lacking or only having insufficient lubricating ability, includes gearwheels moving in an operating chamber of the pump, conveying fluids and being mounted completely in parts formed of a carbon material. Supports are formed from accurately worked lateral walls and a jacket of the operating chamber formed of the carbon material. The jacket surrounds the gearwheels in the radial direction and is likewise constructed as a support. Chambers on the suction side and on the pressure side for fluid supply and fluid removal, which are necessary for the operation of the pump, are molded into side walls of the operating chamber which is formed of carbon.

Abstract: Vane for use in a rotary vane compressor or other rotary expansible chamber device and process for making the vane in which the vane comprises a vane body having a first tip, a second tip, and a vane body interconnecting the tips. At least one of the first and second tips comprises a metal alloy and a lubricating agent provided in admixture with the metal alloy. The vane body comprises a metal alloy and a plurality of inorganic particles provided in admixture with the metal alloy. The inorganic particles have a coefficient of thermal expansion which is less than the coefficient of thermal expansion of the metal alloy.

Abstract: A downhole submersible fluid pump having a progressive cavity motor section driving a rotary pump such as a centrifugal or axial pump. In the motor section an inner helical member is fixed relative to an outer rotatable member having helical threads. By forcing power fluid into the motor chamber between the inner and outer member causes the outer member to rotate relative to the fixed inner member. This rotary motion is transmitted to a rotary member of a centrifugal pump, for example, drawing fluids from the subterranean formation upwardly as produced fluids.

Abstract: A rotary vane motor for efficiently extracting mechanical energy from an expanding gas at low rotational speeds is provided. The motor includes a housing having a cylindrical enclosure, a rotor having a plurality of radially oriented slots, a plurality of vanes slidably movable in the slots, a shaft for rotatably mounting the rotor in an eccentric position within the housing enclosure, and a slidable connection between the rotor and the shaft for equilibrating close clearances between the rotor and the side edges of the vanes and the inner surfaces of the housing to minimize inefficiencies due to blow-by and friction. Additionally, the materials forming the rotor, the vanes, and the housing are all selected to have the same thermal coefficient of expansion so that the vanes tightly interfit within their respective slots and the sealing surfaces of the housing over a temperature range spanning the cryogenic temperatures associated with the prefeffed drive gas, and maximum ambient temperatures.

Abstract: A rotary compressor of the type provided with a screw (1) and pinion gear (4) is protected from liquid lock effects by disc spring (17) which applies on the pinion gear shaft (11) a pressure higher than the maximum thrust applied on the pinion gear during normal compressor operation.

Abstract: A rotary machine vane includes a body and an articulated tip pivotally joined thereto. The body is complementary with a slot of a rotor in which it is mountable for radial reciprocation therein. The body includes an arcuate cradle extending axially along a radially outer end thereof. The vane tip includes a pin and an integral plate extending along the pin for facing a casing surrounding the rotor to form a seal therewith. The pin is complementary to the cradle for defining a radial gap therebetween, and is radially outwardly retained by the cradle for rocking movement therein for self-alignment with the casing.

Abstract: A vacuum impregnated porous cylinder is utilized in a vane type air motor to provide a continuous source of lubrication for the vane tips rotating within the cylinder thereby eliminating the need for lubricant dispersion in the air supply.

Abstract: A compressor in accordance with the present invention includes a male rotor which is axially aligned with and in communication with two female rotors. The male rotor is driven by a motor, in other words the male rotor is the drive rotor. The male rotor has a plurality of lobes which intermesh with a plurality of flutes on each of the female rotors. The male rotor comprises an inner cylindrical metal shaft with an outer composite material ring mounted thereon. The ring includes the lobes of the male rotor integrally depending therefrom. The lobes of the male rotor being comprised of a composite material allows positioning of the female rotors at a small clearance from the male drive rotor. This clearance is small enough that the liquid refrigerant itself provides sufficient sealing, cooling and lubrication. The positioning of the female rotors on opposing sides of the male rotor balances the radial loading on the male rotor thereby minimizing radial bearing loads.

Abstract: An improved gear pump having members with different hardnesses includes a housing defining an internal bore with inlet and outlet passageways. A head member includes a wall between the inlet and outlet passageways and extends toward a toothed rotor. A toothed idler gear meshes with the rotor. The head member and idler gear are made of materials having a hardness greater than that of the rotor material. In one embodiment the idler gear is made of ceramic material whereas the head member and rotor are made of cast iron, with the head member treated to have a hardness greater than that of the rotor.

Abstract: An improved gear micropump (10) for delivering corrosive materials, particularly photographic materials, such as dyes and emulsions, has a pair of intermeshing gears (16,18) rotatably mounted on zirconia ceramic shafts (24,26). The ceramic shafts of the invention may be formed from zirconia and zirconia composite materials. The gear micropump (10) having the zirconia ceramic shafts (24,26) eliminates pulsation during fluid delivery and is resistant to wear and abrasion. Moreover the zirconia ceramic shafts (24,26) are strongly resistant to chemicals like photographic emulsions and dyes and, therefore, do not contaminate product with corrosive materials.

Abstract: The stator, rotor and/or flex shaft of a progressive cavity pump is made up of composite materials, e.g., fiberglass and resin, in a variety of combinations with and without bonded resilient elastomers. The composites are formulated to provide resiliency and non-resiliency where needed. The flex shaft between the rotary power source and the rotor is made of composite materials and designed to absorb the orbital and gyrational movement of the rotor.

Abstract: A sea water pump (130) for a marine propulsion system includes a housing (130) having a generally cylindrical pumping chamber (134) defined by a generally cylindrical sidewall (136) extending axially between opposite end walls (138 and 140). A multi-vaned rotary impeller (44) in the chamber is driven by an impeller shaft (28) extending axially into the chamber through one of the endwalls (40). An intake port (146) at the other endwall (140) has a first branch (148) providing radial flow (170, 172) into the chamber, and a second branch (154) providing axial flow (178) into the chamber. A discharge port (158) has a first branch (160) receiving radial flow (174, 176) out of the chamber, and a second branch (166) receiving axial flow (180) out of the chamber.

Abstract: A moderately high pressure, sliding vane pump is fabricated from low modulus plastic by routing high pressure fluid away from the central pump perimeter and into a bearing gland chamber for discharge porting. Port fittings are push socket connections that are sealed by O-rings and held in place against fluid pressure ejection by a saddle plate that cross-pins to the port boss.

Abstract: A compressor in accordance with the present invention includes a male rotor which is axially aligned with and in communication with two female rotors. The male rotor is driven by a motor, in other words the male rotor is the drive rotor. The male rotor has a plurality of lobes which intermesh with a plurality of flutes on each of the female rotors. The male rotor comprises an inner cylindrical metal shaft with an outer composite material ring mounted thereon. The ring includes the lobes of the male rotor integrally depending therefrom. The lobes of the male rotor being comprised of a composite material allows positioning of the female rotors at a small clearance from the male drive rotor. This clearance is small enough that the liquid refrigerant itself provides sufficient sealing, cooling and lubrication. The positioning of the female rotors on opposing sides of the male rotor balances the radial loading on the male rotor thereby minimizing radial bearing loads.

Abstract: Disclosed is a fluid delivery supply unit having an internal gear pump as a pump unit, with a bearing race in which a driven inner gear is arranged on a bearing journal and the inner gear rotates with it by way of toothing engagement with an outer gear arranged between the inner gear and the bearing race, and the inner gear has one tooth fewer than the outer gear so that a pumping action is produced. A low noise level, resistance to corrosion, and a reduced weight, are obtained by forming parts of the internal gear pump, such as the bearing race, inner gear or outer gear, of a ceramic material.

Abstract: A rotary compressor comprises an outer casing, a rotary type compression mechanism accommodated in the outer casing in a sealed manner, and an electric motor for driving the rotary type compression mechanism. The rotary type compression mechanism is provided with a cylinder having an inner peripheral surface to which a discharge port is formed, and the inner peripheral surface of the cylinder has a portion formed of a valve sheet to which said discharge port is formed.

Abstract: A rotary engine includes a cylindrical rotor having four spaced apart vanes therein mounted in a stator housing having an oblong perimeter casing which defines generally crescent shaped, diametrically opposite first and second working chambers in which the rotor vanes travel. Inlet and outlet ports are disposed at respective ends of the working chambers, and a flow chamber is joined to the casing between the working chambers. The vanes have tip apertures supplied with pressurized fluid to provide bearings with the casing.

Abstract: A fluid compressor having a rotational force transmitting mechanism. The mechanism comprises an Oldam portion, an Oldam ring and a second cylinder gearing. The Oldam portion is integral with a piston. The Oldam ring has a first pair of key grooves and a second pair of key grooves. The key grooves of the first pair extend at right angles to those of the second pair. The second cylinder bearing is fitted in the cylinder and has two projections fitted in the key grooves of the second pair. The Oldam ring is made of silicon nitride ceramic.

Abstract: An orbiting scroll is made with a ceramic particle reinforced aluminum metal matrix composite. The resultant part has increased wear resistance, closer thermal expansion matching with cast iron, can be used without tip seals and offers the advantages associated with a reduced mass. In manufacturing the part, the part is pressure cast to a near net shape and machined to the final shape.

Abstract: An internal combustion engine has a ring-shaped stator with a plurality of thin slits. A rotor, having a plurality of helicotoroidal troughs formed on its inner surface, encloses the stator. A planar vane wheel, having a plurality of radially extending vanes, is resident in each of the thin slits, with the vanes communicating with the respective helicotoroidal troughs. Rotation of the rotor imparts rotation to the vane wheels. The interaction of the stator, troughs, and vanes produces a plurality of sequential intake, compression, combustion, expansion, and exhaust chambers.

Abstract: A gerotor pump having reduced drag torque at low temperatures is disclosed. The pump includes a shaft journalled in the housing. Mounted on the shaft are a pair of axially space metallic port plates and disposed therebetween are metallic interior and exterior gears. A ceramic eccentric ring circumscribes the exterior gear to define a diametral clearance.

Abstract: A ceramic helical rotor expander using a double-ended or tandem herringbone type rotor arrangement with bearing and seal assemblies remote from the hot gas inlets and especially capable of operating at an inlet temperature of above 1100.degree. C. The rotors are solid or hollow and bonded to hollow metal shafts, and mounted in a composite or simple prismatic casing. The rotors, casing and shafts are constructed from low expansivity materials. In the preferred embodiment the rotors are constructed of silicon nitride and the shafts constructed of an molybdenum alloy, with the metal shafts being supported in bearings and secured to synchronizing gears. The rotors and casing may be provided with coolant channels therein, and are constructed to eliminate the problem of end leakages at inlet temperature and pressure, and the need for high temperature bearings and seals.

Abstract: This invention describes a fuel system for an internal combustion engine of the diesel type which is completely compatible with methanol and other low cetane liquid fuels. The fuel system is also capable of handling methanol liquid fuel, and other low cetane highly corrosive liquid fuels, of materials fully compatible with the fuel and adapted for long term durability use. Further, a fuel system is disclosed that is free of particulates of less than one micron in size thereby providing superior long term durability protection against scoring within the fuel pump and fuel delivery injectors. The invention also provides a fuel system comprising primary and secondary fuel filters, a fuel pump, and the fuel injectors designed to provide acceptable durability and reliability despite the lack of lubricity in methanol and similar fuels.

Abstract: A rotor for a rotary screw machine has helical lobes (12) and grooves (14). A shell structure (18) forming the external surface of the rotor is made of pressed metal power. The rotor is manufactured by cold isostatic pressing of a powder in a vessel having a surface shaping rotor. The pressure is applied radially by means of a cast bag in which high pressure liquids acts. After the pressing process, the rotor blank is sintered and attached to a shaft (16).

Abstract: A rotary compressor, such as a sliding vane compressor, comprises a housing having a bore, a rotor assembly operatively arranged to rotate within the bore, vanes operatively arranged at the rotor assembly to move linearly relative to the rotor assembly and to form, together with the housing and rotor assembly, variable chambers, and a valve assembly arranged in the housing. The bore has a configuration divided into a expansion region of elliptical shape, a circular transition region, a polynomial-shaped compression region and a circular sealing region. The lubricant seal is composed of an oil injection port and oil grooves for trapping and transporting the oil. The valve assembly is provided in a recess portion of the housing and is configured as a thin blade covering each discharge port which has been relieved to minimize undesirably large difference of the pressure forces between the two sides of the blade. Oil grooves are provided in the rotor assembly and in end cap assemblies.

Abstract: A gear pump for use in a metered liquid dispensing system utilizes a pair of carbon graphite wear plates to increase pump vacuum or suction lift capabilities. The wear plates are disposed on opposite sides of the pump spur gears and are biased against the sides of the gears to reduce internal pump clearances. The biasing force is provided by a resilient O-ring positioned between a surface of the pump housing and one of the wear plates. The gears are mounted for limited movement so the urging of the one wear plate is transferred through the gears to the other wear plate. The gear pump is driven through a gear reducer unit by a reversible electric motor. The use of a gear pump assures accurate metering of the amount of fluid delivered by the system.

Abstract: The invention proposes in gear ring pumps for reciprocating internal-combustion engines and/or automatic transmissions allowing the hollow gear to run in the hollow gear housing with a play which is large enough for the pronounced fluctuations of the radial position of the crankshaft or input shaft carrying the pinion of the gear ring pump to be taken up thereby and selecting a toothing for the pump such that the effective mounting of the hollow gear on the pinion is achieved. If a correspondingly largeplay is provided between the shaft and the pinion, the hollow gear is mounted with minimum play in the housing. The pinion is then mounted in the hollow gear.

Abstract: A screw-type compressor/expander including a housing having inlet and outlet ends and two matching profile rotors with male and female lobes helically wrapped to form endless screws is characterized by end plates having spaced ports arranged at each axial end of the rotors and valve gates slidable with respect to other end plates to select either compression mode ports or expansion mode parts. When the expansion mode ports are selected, the rotors and housing enclose spaces initially opening to the inlet end that have a volume that expands as the rotors are turned. When the compression mode ports are selected, the rotors and the housing enclose spaces initially opening at the inlet end and then closing such that the volume of the spaces contracts as the rotors are turned.

Abstract: A pivoting vane rotary compressor is disclosed including a housing having a generally cylindrical chamber. A generally cylindrical rotor is mounted eccentrically in the chamber to define about the rotor a main chamber region, which narrows to a constricted chamber region. An intake port is formed in the housing for introducing air into the main chamber region. An exhaust port is formed in the housing for discharging air from the constricted chamber region. At least one pair of vane elements are pivotably mounted to the rotor and extend therefrom into the chamber. The rotor is rotatably driven such that the vane elements engage the cylindrical wall of the chamber and each pair of vane elements defines a compartment that transmits air from the main chamber region to the constricted chamber region, whereby air is compressed and discharged through the exhaust port.

Abstract: A rotary sliding vane pump having vanes fabricated from a carbon/carbon based material that provides improved performance by inhibiting vane wear, chipping or fracture. The advantages provided by carbon/carbon based materials may be further enhanced by impregnating each carbon/carbon sliding vane with a teflon based coating.

Abstract: In a generator-receiver for power transmission, side plates are molded on an insert with a good coefficient of friction whose outer face is flush with the inner face of each side plate and which comprises two circular parts joined by a bi-concave joint, the insert comprising grooves in each of which the plastic material constituting the side plates penetrates to form a bead in which each cavity is formed.

Abstract: A rotary air motor has a stator with a cylindrical inner surface defining a chamber and a cylindrical rotor mounted by hub structure for eccentric rotation within the chamber and end plates closing the opposite ends of the chamber and spaced from the adjacent ends of the rotor by end clearance spaces. The rotor has a plurality of arcuate slots therein extending the length thereof and respectively slidably receiving arcuate vanes arranged so that when the rotor is rotated the outermost edges of the vanes are centrifugally urged into sliding engagement with the inner surface of the stator.

Abstract: A rotor for a screw rotor machine, which rotor comprises a metal shaft (3, 13) and a rotor body (1) of plastics material moulded on the shaft, which is provided with a number of radially extending projections (4) with equal distribution around the shaft, which projections (4) are provided with essentially peripherally extending wings (5) originating from the ridge of the projections (4).

Abstract: A compressor includes a cylinder, and a rotating body located in the cylinder, and a helical groove formed on the outer periphery of the rotating body. A helical blade is fitted in the groove and divides the space between the inner periphery of the cylinder and the outer periphery of the rotating body into operating chambers which have volumes gradually decreasing with distance from one end of the cylinder. The helical blade has dimensions satisfying the following formula:(1+.mu..sup.2) (.alpha./.beta.)<(L+.mu.B)in whichB: axial width, T: radial height, L: exposed height, and .mu.: frictional coefficient, and in which.alpha.=(B.sup.2 +2TL-L.sup.2)/2 +{-B.sup.2 (1-.mu..sup.2)+.mu.BT+.mu..sup.2 TL}/(1-.mu..sup.2).beta.=T-L+{.mu.B(1+.mu..sup.2)+(2.mu.(.mu.(.mu.T-B)}/(1-.mu..sup.2).

Abstract: Feed unit, in particular for the feeding of fuel, having an electric drive motor and a pump unit coupled to it, which comprises a base plate, an intermediate plate having a recess for rotating pump parts and a cover, at least the base plate and the cover consisting of a ceramic material and the end sides of the base plate and of the cover which face the intermediate plate having ground surfaces.

Abstract: A vacuum vane pump wherein one or more stages are installed in an annular extension of the casing for the pump motor. Each stage has a rotor which is driven by the motor shaft by way of an elastic key, and an annular housing which surrounds and is eccentric relative to the rotor. The housing is pivotable about a pintle which is installed in the end walls of the casing and is parallel to the motor shaft. The width of an annular clearance between the external surface of the housing and the internal surface of the extension can be varied by a radially disposed screw which is mounted in the extension diametrically opposite a spring-loaded abutment for the housing. The components of each stage are biased to predetermined axial positions by springs which react against the extension and bias one end wall of the casing against the adjacent housing and rotor, either directly or by way of a partition.

Abstract: A rotary compressor has a plate-like hollow vane disposed in sliding contact with a rotary piston. The vane has an internal cavity formed by a plurality of bores each having a substantially rectangular cross-section. The corners of each bore are each formed by a curved concave surface of a radius of curvature which is greater than the thicknesses of the outer walls of the vane. The major side surfaces of the vane are in slidable contact with opposing walls of a vane slot and have surface layers each formed of an oxide film consisting mainly of tri-iron tetraoxide (Fe.sub.3 O.sub.4). The film is finished by smoothing processing, thus attaining a smaller friction between the vane major side surfaces and the vane slot walls and suppressing local wear of the vane slot walls.

Abstract: A fluid powered vane motor for operation with a minimum of externally supplied lubrication has a motor chamber made up of a cylinder with an eccentric cylindrical bore and end plates abutting the ends of the cylinder. A rotor with a plurality of axially oriented radial slots on its circumferential surface is supported on bearing means within the chamber. Radially slidable vanes are disposed in the radial slots of the rotor so that they form a moving seal between the rotor surface and the cylinder wall. Pressurized fluid introduced to the motor chamber acts upon the vanes of the rotor and imparts rotary motion thereto. Operation with a limited amount of externally supplied lubrication is accomplished by making end plates of inherently lubricious material such as fiber-reinforced polymeric material, and by coating the innner bore of the cylinder with a soft coating having lubricious properties in contact with the selected vane material.

Abstract: Hydraulic generator-receiver with needle bearings (123) on the driving gear (9) and providing for play compensation between the end plates (21, 22) and the envelope (36), a leak return and a better supply of the pressure zone (34).

Abstract: A pneumatic tool has a one-piece metal tube forming an air motor cylinder and an associated air inlet plenum. Air passages are formed between an inner housing, molded in situ about the motor cylinder tube, and an outer housing separately molded. The inner and outer housings are both formed from a non-metal composite material which contributes to operator comfort by its light weight, thermal insulation, vibration damping, and noise suppressing properties. The tool may be assembled to provide forward exhaust, rearward exhaust, or combined forward and rearward exhaust.

Abstract: A rotor for a rotary screw machine having helical lobes and intermediate grooves, the rotor having a core including a shaft 1 of a first material and a rotor body 2 of a second material mounted on the shaft. The surface of the rotor is coated with a plastic layer 3.

Abstract: A vane pump in which a projection is provided on the end of a vane which radially slides as a rotor rotates, and an annular race concentric with an inner peripheral surface of a housing is provided in the inner surface of the end wall of the housing, the projection being brought into engagement with the annular race to control the slide of the vane.

Abstract: A starter arrangement for an engine includes a fluid actuated rotary vane motor which is adapted to engage an associated engine. The rotary motor has a plurality of blades or vanes with each of the blades being made from a fiber reinforced plastic material to reduce friction. A sleeve, in which the rotary motor is positioned, has on its inner surface a hard metallic coating to reduce friction. A relay valve member selectively provides a pressurized operating fluid to the rotary motor. The blade material and the sleeve inner surface coating cooperate to enable the vane motor, when it is actuated by the relay valve member, to rotate in the sleeve with a minimum of friction thereby obviating the need for a lubricating agent.