Abstract: An improved gear pump or motor includes seal plates (30, 32) having a lubrication channel (48, 50) communicating between the shaft bearings (18, 20, 22, 24) and the low pressure side of the zone (62) where the gear teeth (58, 60) intermesh. Lubricant flow is directed first through one bearing on one side of the pump and then back through a separate channel (54, 56) to the other bearing on the same side of the pump. Placement of the lubrication channels on the low pressure side of the pump where the volume between intermeshing teeth is increasing and the pressure between the teeth is below inlet pressure ensures that flow reversals in the bearings and lubricant aeration are avoided; and renders bearing flow rate less sensitive to pressure, so that relatively large flow channels may be used in the wear plate.

Abstract: A passage leads from a high pressure discharge zone of a vane pump to an interface defined between the surface of the rotor of the pump and an arcuate contact surface formed in the inner wall of the pump housing to supply fluid under pressure to the interface for lubricating same.

Abstract: A sliding vane compressor for use in refrigeration systems includes a rotatable hollow shaft, a cylindrical compressor rotor which surrounds the shaft, end covers enclosing the compressor rotor and a pair of vanes disposed within the rotor to compress a working medium entering the rotor. The compressor rotor and end covers have end faces in a contact area therebetween. At at least one of end faces of either rotor or end cover, a number of spirally-shaped grooves are formed curved in the direction of rotation of the rotor shaft. These grooves extend from the periphery of the respective end face toward the center thereof but short of said center to produce a flow preventing leakage of the working medium between the low pressure region and the high pressure region in the compressor.

Abstract: A vane type hydraulic motor which is operable with seawater as the hydraulic fluid for undersea diver use. The motor is compact, lightweight and is lubricated by the seawater working fluid. The motor uses corrosion resistant materials with the requisite flexibility, mechanical strength, friction characteristics and low swelling rate when immersed in seawater. The motor structure provides durable seal means and pressure balanced operation which minimizes wear. The vane structure permits easy sliding vane movement, and uses the seawater pressure to control vane movement and sliding seal capability.

Abstract: A rotary helical screw compressor for a refrigeration system employing a condensable refrigerant comprises intermeshed rotors mounted for rotation by way of anti-friction bearings, within a hermetic housing. A lubricating oil miscible in liquid refrigerant is supplied to the compressor in a mass ratio of between 0.25 and 12%, by weight of solution. Vaporized working fluid at discharge pressure and bearing oil mist is permitted to seep through the anti-friction bearings in closed loops, from the discharge side of the machine towards the suction side, for effective lubrication. Thus, the refrigeration system is oil pump free, oil sump free, and oil filter free. Liquid refrigerant oil solution may be bled from the condenser and injected into the compression chamber defined partially by the intermeshed rotors at a point in the compression process where the compression chamber is cut off from suction and discharge sides of the compressor, for cooling the rotors.

Abstract: A rotary fluid pressure device is disclosed of the type utilizing a gerotor gear set (13) and an output shaft assembly (45) including a spool valve (49). The device includes a housing (11) defining inlet and outlet ports (21 and 23). The spool valve and housing cooperate to define a lubrication fluid chamber (59). Torque is transmitted from the gerotor set to the output shaft by a dogbone shaft (61) having a rearward spline connection (65, 69) to the gerotor, and a forward spline connection (63, 67) to the output shaft. The spool valve defines a pair of annular grooves (71, 73) in communication with the ports and a pair of check valve assemblies (91, 93) to permit flow of lubrication fluid from the lubrication chamber into whichever of the annular grooves is in communication with the outlet port.

Abstract: A rotary compressor for compressing fluid. A housing having a cylindrical internal cavity is provided with vanes and delivery ports. A rotor is rotatably mounted in the housing. The rotor has a portion for making a sealing contact with the inner peripheral surface of the housing. The rotor has a suction chamber formed therein. The number of the vanes is greater by 1 (one) than the number of the sealing contacts between the rotor and the inner peripheral surface of the housing. At least one suction port is formed through the wall of the rotor, so that the fluid in the suction chamber may be sucked into the working chamber defined by the vanes, rotor and the housing. The suction port is so located that, when a working chamber has been expanded to its maximum volume, the suction port is positioned between the vane located at the leading side of the working chamber as viewed in the direction or rotation of the rotor and the sealing portion closer to the vane.

Abstract: A plastic extrusion apparatus is provided which includes a gear pump for accurately metering the plastic through a die. The apparatus is adapted to process highly viscous plastic material under high temperature and pressure conditions, and the gear pump includes a non-leaking and substantially frictionless seal for the drive shaft. The seal comprises a sleeve surrounding the shaft, and a shallow helical channel formed in the bore of the sleeve, with the helical channel being of a hand such that forward rotation of the shaft results in the plastic which enters the clearance between the shaft and sleeve to be effectively pumped back toward the interior of the housing.

Abstract: A gear pump suitable for pumping contaminated fuel has a lubrication passage in a pump bearing which receives fuel from the clearance volume between the bearing and the housing in the pump discharge arc. The clearance entrance between the bearing and the housing, which functions as a filter, is smaller than the passage so that contaminants traversing the clearance will not obstruct the passage. Since only contaminants smaller than the clearance entrance can enter the passage, the passage may be made sufficiently small so as not to adversely affect pump performance.

Abstract: At least one pair of intermeshing impeller gears are supported by bearings such as bushings or roller bearings. Liquid drawn through the suction port is forced first to flow perpendicular to the axes of the gears toward one ends of the shafts or trunions thereof and then through a low pressure passage extended in parallel with the axes of the gears and communicated with the pump chamber in opposed relationship with the zone where the teeth of the gears are disengaging. Each bearing is formed with a lubrication or oil groove or passage. One port or end remote from the side face of the gear of the lubrication or oil groove is communicated with the low pressure passage at the closed end thereof or at a position adjacent to the inlet thereof through a passage while the other port or end is communicated through a passage with the low pressure passage at a position between the inlet and closed end thereof.

Abstract: A fluid pressure operated wheel motor is disclosed of the type including a stationary housing assembly (11) and a rotatable housing assembly (13), which includes a gerotor displacement mechanism (29). The gerotor ring (47) is part of the rotatable housing assembly and rotates, while the gerotor star (49) is connected by a dogbone shaft (57) to the stationary housing assembly and only orbits. The dogbone shaft defines an axial bore (67), and the stationary housing defines a pair of main fluid passages (71 and 73) which cooperate with a plurality of fluid passages (91 and 93) defined by the rotatable housing assembly to form commutating valving. In either direction of operation, the system fluid flows through the chamber (19) in which the dogbone is disposed. The system fluid is divided into two portions, with one portion flowing through one spline connection (59 and 63), and the other portion flowing through the axial bore and the other spline connection (61 and 65).

Abstract: A hydraulic motor of the Gerotor-type which is designed for rotation in both the clockwise and the counterclockwise direction and which includes a pair of relief valves arranged to protect the motor shaft seal, irrespective of the chosen direction of rotation. The Gerotor element also includes a pair of motoring grooves which cooperate with a feed channel formed in the surface of the motor end plate and with a corresponding shadow feed channel on the opposite motor front plate to equalize the forces on the rotor element of the Gerotor and thereby prevent distortion and binding of the rotor element due to thrust forces thereon.

Abstract: An inertial filter is installed in the discharge of a pump which is used to transfer slurries, and the filtrate stream from the filter serves as the pump seal flush.

Abstract: An air motor includes an arrangement such that a part of an exhaust air from a cylinder of the air motor passes through a gear chamber containing a gear mechanism which links a gear fixed to a shaft directly connected to a rotor with a power output shaft and is discharged through a silencer.

Abstract: A hydraulic motor comprising a cylindrical rotor including a central bore, a cylindrical stator including selectively advanceable blade means, a stator having a central bore and first conduit means for directing pressurized fluid to the blade means, a drive shaft extending through the rotor central bore, the drive shaft including a full diameter portion secured to the rotor and a reduced diameter section extending from an axial location within the rotor member into the stator member central bore, a conical bearing secured to the drive shaft, a bearing track, a cylindrical sleeve member secured within the stator central bore and extending into the central bore to an axial location spaced from the full diameter drive shaft portion and establishing with the rotor central bore a first journal bearing, a segment of the reduced diameter drive shaft portion at the free end thereof establishing with a corresponding segment of the sleeve, a second journal bearing, the internal diameter of the remaining segment of the

Abstract: A fluid pressure operated motor is disclosed of the type utilizing a gerotor gear set and an internal output shaft and spool valve. The motor includes a housing defining a fluid inlet port and an endcap defining a fluid output port. The motor further includes a dogbone shaft defining an axial bore and having a spline connection to the output shaft at one end and a spline connection to the externally-toothed member of the gerotor at its other end. In one direction of operation of the motor, the fluid exhausted from the contracting volume chambers passes through a radial passage of the spool valve into the interior of the spool valve. A portion of this system fluid flows through the forward spline connection, then through the bore in the dogbone shaft toward the endcap, while the other portion of the system fluid flows through the rear spline connection. The two portions recombine and flow through the fluid port in the endcap.

Abstract: An improved gear pump includes seal plates having lubrication channels communicating between the low pressure side of the zone where the gear teeth intermesh and the shaft bearings. Lubricant flow is directed first through one bearing on one side of the pump and then back through the other bearing on that side to the pump inlet chamber. Placement of the lubrication channels on the low pressure side of the pump where the volume between intermeshing teeth is increasing ensures that flow reversals in the bearings and lubricant aeration are avoided; and renders bearing flow rate less sensitive to pressure so that relatively large flow channels may be used in the wear plate.

Abstract: Rotary pumps wherein the conveyed fluid, e.g. foodstuffs, entering around the rotor seats, is prevented from staying there statically, by circulating part of the fluid from the high-pressure side of the pump chamber to the low-pressure side through appropriate holes or apertures disposed around the rotor seats, and by making use of the fluid pressure itself. Washing can be carried out around the seats by circulating water that is fed to the pump, instead of the fluid, after the use of the pump has been stopped. The pumps feature a fluid circulating passage between the high-pressure side and a space in a cap portion, for purposes of cleaning that space.

Abstract: A lubrication arrangement for the blade chain of a felling saw utilizes the oil in the hydraulic system which operates the blade chain. Some of the oil flowing from a hydraulic motor to a lubricant tank is fed to the chain for lubrication purposes. The feed line includes a flow controller such as a resistance valve and a directional valve for preventing oil from flowing to the tank from the chain when the saw is not operating.

Abstract: A gear pump is disclosed wherein the shafts of at least a pair of intermeshing gears are rotatably supported in bushings each with an axially extended lubrication groove formed in the bore of the bushing, one end of the lubrication groove being communicated through a low pressure chamber defined in the inner end face of the bushing with a portion of a suction port located adjacent to the root or dedendum circle of the gear while the other end of the lubrication groove being communicated with the suction port through a hole extended through the bushing or casing or notch formed therein, whereby part of the liquid drawn through the suction port upon rotation of the intermeshing gears is forced into the pressure chamber because of the fact that the liquid drawn into each tooth space of the gear is imparted with the impact speed directed in the radial direction of the tooth space due to the difference between the speed with which the liquid is drawn into the gear pump and the rotational speed of the intermeshing

Abstract: A rotary pump for hot pitch, asphalt and like viscous solidifiable material, having a cylindrical outer extension on a packing gland to provide an elongated passage around a driving shaft, thereby allowing leaking material to solidify and be reduced into powder before falling from the outer end of the packing gland.

Abstract: A gear machine, such as a gear pump or gear motor, has a housing in a chamber of which there are journalled two gears which mesh with one another. The shafts of the gears are journalled for rotation in bearing sleeves. The housing has an intake for fluid at low pressure and an outlet for fluid at high pressure. The gaps between the teeth of the gears which receive fluid at low pressure communicate with the intake exclusively by way of passages which extend in part along the sleeves and shafts, so that the entire quantity of incoming fluid is compelled to travel in these passages and to cool and lubricate the sleeves and shafts.

Abstract: A rotary fluid pressure device of the type including agerotor gear set having an externally-toothed rotor orbiting and rotating within an internally-toothed stator. An intermediate shaft has one end in splined engagement with the rotor and the other end defining a large set of internal splines. The device includes an output shaft assembly, also defining a large set of internal splines. A large dogbone shaft having external splines at each end transmits torque between the intermediate shaft and the output shaft assembly. The intermediate shaft has an axial bore which communicates pressurized lubricant to the one end of the dogbone shaft, a portion of the pressurized lubricant flowing radially outward over the end of the dogbone and through the spline connection between the dogbone and the intermediate shaft.

Abstract: A reversible lubricant pump supplies oil to one of a pair of tandem drive axles. The pump includes a housing mounted on the axle helical gear cover to receive oil from an oil sump within the axle casing and to discharge oil to various components within the drive axle assembly. A drive gear and a driven gear are mounted within the housing for rotation in either direction to pump oil from a common inlet passage to a common outlet passage. The drive gear is mounted on a pump shaft which extends from within the housing to within the axle helical gear cover and has a pump gear fixedly mounted thereon. The pump gear is driven in response to movement of an input shaft of the axle assembly to cause the pump to operate in both the forward and reverse directions. A lubricating port within the housing extends from the pump discharge to the bearing of the pump shaft to provide the pump shaft with lubrication when the drive axle assembly is operated in the forward direction.

Abstract: A working member, i.e., an eccentric drive ring having internal teeth, orbits about a driven pinion having a lesser number of teeth to achieve gear reduction. Hydraulically expressed divider vanes on the orbiting drive ring engage the inner periphery of a surrounding fixed ring to define working chambers between the outer periphery of the drive ring and the inner periphery of the fixed ring. Port plates on opposite sides of the drive ring are respectively exposed to high and low pressure fluid. Valving occurs when slots on opposite sides of the drive ring are exposed to ports on the port plate as the result of the orbital movement of the drive ring, so as to establish fluid flow paths to and from the working chambers.

Abstract: An improved gear pump for pumping molten metals, such as molten lead or lead alloy, in which sealing means are provided to prevent loss of metal flowing axially along the pump drive shaft. A cooled annulus is provided about the pump drive shaft for solidifying molten metal therein which forms an effective seal and bearing.

Abstract: Dynamic shaft seal system for a screw compressor with water injection comprising a water separator, where pressurized gas from the water separator is supplied around the rotor shafts as a blocking medium.

Abstract: This invention relates to flow restrictors in fluid motors where the operating fluid also passes through the bearings of the motor.