Showing papers on "Gear pump published in 1994"

Lubrication system for a planetary gear train

Abstract: A lubrication system for a planetary gear train (6) includes oil spray bars (32) intermediate each pair of planet gears (10). Oil exits the meshes between the sun gear (8) and the planet gears (10) and between the planet gears (10) and the ring gear (18) with substantial tangential velocity. The expelled oil enters and oil discharge passage (62) in an oil collection channel (56) adjacent to an axially outboard of the ring gear (18). In the preferred embodiment, herringbone gears are used and rotate so that oil within the gear meshes is pumped axially outward toward the channels. Interplanet baffles (80) and collection troughts (82) may also be used and are especially beneficial in an alternative embodiment which uses bihelical gears whose direction of rotation pumps oil within the gear meshes axially inward.

Microfabricated fluidic devices

Abstract: Problems which have prevented the application of microfabrication techniques to fluidic devices are overcome, enabling the realization of a wide variety of devices, including vane pumps, centrifugal pumps, gear pumps, flow sensors, piston pumps, piston valves, hydraulic motors, nozzles, and connectors. Such devices are characterized by very steep walls (e.g. runout of 0.1 νm for a wall height of 100 νm) and very tight tolerances. The devices may be made of a variety of materials, including ceramic, plastic, metal and magnetic media. An x-ray lithographic technique, such as sacrificial LIGA, is used in a preferred embodiment.

Wide cut harvester having rotary cutter bed

Abstract: A harvester (10) which uses a rotary style cutter bed (30) has a series of rotary cutters (32a-32j) extending across the path of travel of the machine and rotatable about individual upright axis. Part of the cutter bed (30) is a flat gear case (34) containing a train of intermeshed spur gears (35) that serve to distribute power between the cutters above the gear train. Each end of the gear case (34) has a hollow, gearless extension welded thereto which supports at least one additional outboard cutter that receives its driving power exteriorally of the gear case (34). One embodiment uses a mechanical drive to bring power to the upright shaft of the cutter having the first spur gear so that the cutters with gears receive all their power from the driven cutter. The outboard cutters not having gears are driven by exterior, over-the-top drive mechanism coupled with the shafts of the first and last geared cutters, such drive mechanism alternatively taking the form of timing belts (120).

Hydrostatic-mechanical gear for driving a mixing drum

Abstract: The invention concerns a hydrostatic-mechanical gear for driving a mixed drum and, in particular, the drum of a concrete mixer vehicle. Cooling is provided for by the continuous removal of oil from a high pressure circuit, via a connecting pipe, and the constant feeding of the cooled oil, which has passed through an oil cooler, to the interior of a gear housing via a pipe. This pipe discharges into the interior of the gear housing immediately proximate a hydraulic motor. The oil then flows through the hydraulic motor, which is preferably a slow-speed radial piston motor, to reduce the noise generation of the hydraulic motor.

Multiple-chamber gear pump with hydraulically connected chambers

Abstract: Pump heads comprising at least two gear-pump chambers are disclosed Each chamber comprises a housing which defines a corresponding pump cavity Each cavity contains a driving gear and at least one driven gear and has a separate inlet and outlet The pump cavities are hydraulically interconnected by a fluid conduit allowing passage whenever the pump chambers are pumping a fluid so as to generate a higher pressure in one cavity relative to the other cavity, of the fluid from the higher-pressure cavity to the lower-pressure cavity sufficient to maintain hydraulic prime of both cavities

Gear change mechanism

Abstract: An improved gear change mechanism is provided for semi-automatically selecting a change up or change down gear change. The mechanism includes a shaft (31) which is movable in its axial direction and about its axis to make one such movement or a combination of such movements according to the gear to be selected. The shaft (31) is moved by pistons (36, 37) coaxial with the shaft for the axial movement and a piston (46) at a right angle to the shaft for the rotational movement. In practice the axial movement is a translating movement and the rotary movement is a movement into and out of engagement with the gears. Throttle and clutch control functions are also provided so that a gear change is initiated and brought about by switches (19A and 19B).

Gear mechanism for accumulator driven electric drill or electric screwdriver

Abstract: The preferably for use in an accumulator driven electric drill or electric screwdriver provided gear comprises an overload coupling for limiting torque for the adaptation to various torque loads. The overload coupling is comprised essentially of an annular gear which is formed of a plastic material and which circumscribes and is associated with a planetary gearing, which has an internal teeth which are in engagement with the planetary gear. A spring element presses against the annular gear, in order to press the annular gear axially against a detente wall, so that the annular gear is frictionally prevented from rotation, until a predetermined torque loading is exceeded and upon exceeding of the predetermined torque loading the annular gear is allowed to rotate. For this there is provided between the plastic annular gear and the spring element a metallic cam disk, which is non-rotatingly secured to the annular gear.

Cooling system for a motor

Abstract: Cooling system for an electric motor with a gear case, a liquid-, internally cooled or at least hollow rotary shaft and an externally cooled stator, particularly for a traction motor. In order to provide a cooling system, incorporating shaft cooling, which permits high utilisation of the machine and can also be employed for encapsulated and therefore low-noise motors, a system of passages 16, 17, 19 which connects the rotor shaft 6 and the gear case is provided to allow the introduction of gear oil from the oil space 18 of the gear case 15 into the rotor shaft 6 as a coolant and to allow the said gear oil to be returned from the rotor shaft 6 to the gear case 15.

Infinitely variable hydrostatic torque-routing transmission

Abstract: An infinitely variable hydrostatic torque-routing transmission with at least two operating ranges shiftable via switching elements includes a first, mechanical part, including a planetary differential gear, and a second, hydrostatic part, including two adjustable hydrounits. The hydrounits are coupled to each other energetically, are operable in both directions as pump or motor, and are coupled to the mechanical part. The ring gear is coupled, in the various operating ranges, for control of the direction of rotation and speed of rotation of the transmission output shaft, to a first hydrounit, and with the second hydrounit being in the first operating range in drive connection with the transmission output shaft via an alternating switching element, while the first hydrounit, connected to the ring gear, operates as a pump and the second hydrounit as a motor. The ring gear, by means of a second alternating switching element, can be selectively coupled by way of a first gear drive or a second gear drive to the input or output shaft of the first hydrounit. The first gear drive is structured such that the ring gear and the input or output shaft of the first hydrounit rotate in different directions when the ring gear is coupled to the first hydrounit via the first gear drive. The second gear drive is structured such that the ring gear and the input or output shaft of the hydrounit rotate equidirectionally when the ring gear is coupled to the first hydrounit via the second gear drive.

Axially ported variable volume gerotor pump technology

Abstract: A gear pump including a body, a port plate, a pair of gerotor-type rotors, one rotor being connected to a shaft, and a retaining assembly operative on the port plate to rotatably couple it to the body. The retaining assembly permits adjustment of axially oriented inlet and outlet ports disposed in the port plate to vary fluid flow from the pump. Both manually and automatically adjustable retaining assemblies are disclosed.

Manufacture of seamless capsule

Abstract: PURPOSE:To provide a seamless capsule filled with a water solution by jetting a water solution for a shell material, a lipophilic liquid and a water filling liquid respectively from a multiple nozzle of a three-layer structure to form a multiple liquid drop, forming a shell material hardened layer, and then breaking an intermediate layer of the multiple liquid drop. CONSTITUTION:A multiple nozzle 10 is formed into a triple cylinder structure with an inside nozzle 1, a middle nozzle 2 and an outside nozzle 3. A water filling liquid tank 11 is connected to the inside nozzle 1 through a pipeline 4 having a gear pump 7. A lipophilic liquid tank 12 is connected to the middle nozzle 2 through a pipeline 5 having a gear pump 8. Further, a capsule shell water solution tank 13 is connected to the outside nozzle 3 through a pipeline 6 having a gear pump 9. Three kinds of material liquids supplied to the multiple nozzle 10 are jetted into a hardening liquid in a cooling pipe 14 to form a jet of a three-layer structure. After that, a liquid drop formed from the jet is vibrated by a vibration generator 21 to form a seamless capsule SC.

Gear pump for feeding of fluids

Abstract: Gear pump or motor to deliver fluid medium or use fluid medium as power source, respectively. The pump or motor has at least two gears contained within a housing. At least one gear is in a fixed position while the other gear is in slidable engagement with the fixed gear. In the pump configuration, fluid is introduced into the housing on one side of the engaged gears and is drawn through decreasingly wide passages by the rotating gears. The fluid thereby passes to the other side of the gears and exits the pump at a greater pressure. A control medium is used to control the position of the slidable gear. The greater the overlap between the gears the greater the volume of pumped fluid.

Planetary gear with integral electric motor

Abstract: The planetary gear has an integral electromotor. The electromotor is an axial flux ring motor (5) with a stator (3) and a rotor (4) lying axially adjacent each other. The rotor (4) drives the gear. The planetary wheels (11,19) of the gear rotate essentially inside the stator (3). The gear is preferably a tungsten gear.Preferably, the rotor (4) is fixedly connected to a rotary carrier (27) of the gear. The drive shaft (26) may be a hollow shaft. The gear may be a slip-on gear mechanism.

Automatic emergency escape for tall structures

Abstract: A device for safely lowering persons from upright structures such as buildings during an emergency at a safe, predetermined speed of no more than about four feet per second irrespective of the weight of the person being lowered. The device has a drum about which a cable is wound, a gear pump driven by the drum via a reduction gear train, and a hydraulic circuit which includes the gear pump and a flow control valve which maintains a constant hydraulic fluid flow through the circuit irrespective of the weight of the person being lowered and, therefore, also irrespective of the fluid pressure generated by the pump during operation. The hydraulic circuit is in fluid communication with a hydraulic fluid tank having an exterior surface dimensioned to cool the hydraulic fluid and prevent its temperature from rising by more than about 200° F. above the ambient temperature during operation of the device. A handle can be used for manually rewinding the cable about the drum, and the hydraulic circuit includes a one-way branch line, controlled with a check valve, to permit countercurrent circulation of hydraulic fluid during the rewinding of the cable. The gear train causes the gear pump to rotate at a substantially higher rate of rotation than that of the drum to facilitate the control of the fluid flow in the hydraulic circuit. The increase in fluid volume results in improved flow control in the flow control valve.

Gear pump for oil for an internal-combustion engine, in particular for motor vehicles

Abstract: The invention relates to a gear pump for oil for an internal-combustion engine, in particular for motor vehicles, comprising a pump housing mounted on the motor and an outer rotor which is arranged in the pump housing, an inner rotor additionally being arranged within the outer rotor or within the pump housing and at least one suction and/or at least one pressure passage being provided in the pump housing, a drive further being present; the pump according to the invention is integrated in a drive wheel or guide pulley of the internal-combustion engine and the outer rotor or the outer rotors are driven by the drive wheel or the guide pulley.

Bearing for gear pump

Abstract: A floating bearing (148) having an oval body (72) located in a cavity (14) along with a fixed bearing (50) retains a pair of intermeshing gear members (40) in the cavity in a housing (12) of a pump. A spacer member (88) engages an axial rib (84) on the oval body to form a control chamber between the spacer member and the oval body. A resilient member (107) provides an initial force which urges the floating bearing into engagement with the pair of intermeshing gears and forms a gap between the spacer and the oval body. Entrance fluid pressure from an entrance chamber is communicated to the control chamber while discharge fluid pressure from a discharge chamber is communicated to the gap. The entrance and discharge fluid pressures act on the floating bearing to provide a secondary force which urges the floating bearing into engagement with the pair of intermeshing gears to seal the entrance chamber from the discharge chamber.

Load shift transmission with stepless hydrostatic gearing

Abstract: A load shift transmission with stepless hydrostatic gearing comprising: a hydrostatic transmission having a displacement machine with an adjustable volume and a displacement machine with a constant volume; a five-shaft planetary gear transmission having: a coupling shaft for the constant volume displacement machine, the coupling shaft formed by a first planet gear section which meshes with a first sun gear and a first ring gear; a start up coupling shaft formed by a second planet gear section which meshes with a second sun gear; a slow running coupling shaft formed by a third planet gear section which meshes with a third sun gear; a fast running coupling shaft formed by the ring gear of the first planet gear section; an input shaft formed by a planet gear carrier on which the first, second and third planet gear sections are mounted; and an output shaft, wherein the coupling shafts alternately transfer the requisite power through subsequent gear shifting steps to the output shaft.

Hot melt adhesive spray apparatus

Abstract: An improved apparatus for spraying hot melt adhesive includes a gear pump for providing a metered flow of hot melt adhesive. When a valve member is in a first position, a predetermined rate of flow of hot melt adhesive is conducted from the gear pump to a nozzle. When the valve member is in the first position, the valve member blocks a flow of adhesive to a recirculation passage. When the valve member is in a second position, the valve member directs the flow of adhesive from the gear pump to the recirculation passage and blocks a flow of adhesive to the nozzle.

Internal gear pump for wide speed range

Abstract: In an internal gear pump, which can also be constructed as pump with suction control, to reduce the undesired cavitation effects in the pressure region and to permit the oil to flow off from the diminishing displacement cells between the teeth of the gears, and impedance-controlled overflow passage is provided, the openings of which towards the moving displacement cells are alternately opened and closed by the teeth of at least one of the gears.

Hydromechanical drive set with incorporated epicyclic gear - which is mounted on journal, whose front side carries control face of hydraulic motor

Abstract: The epicyclic gear is positively mounted in the hydraulic motor housing and has an eccentric drive. The hydraulic motor is of an axial piston type with a swash plate. The epicyclic gear is mounted on a journal (1a), whose front side carries the control face (6a) for the hydraulic motor. The epicyclic gear is pref. of eccentric or cyclo-type. The drive set typically forms a hub drive with a stationary hub support (1) and a rotary hub (2), both forming together the housing for the hydraulic motor and the epicyclic gear, with the hub support incorporating the epicyclic gear mounting journal. USE/ADVANTAGE - For wheel drives etc., with a high gear ratio, and compact, low-cost design.

Rotodynamic pump design

Abstract: This book provides a brief but thorough account of the basic principles of good pump design. The first three chapters present the basic hydraulic equations, including cavitation, and discuss the principles that underlie the correct performance of the impeller and casing of centrifugal pumps and the blading of axial machines. The fourth chapter outlines analytical methods for flow calculations, including special techniques used in computer aided design. The following two chapters work through two examples: the impeller and casing of a simple volute type centrifugal pump; and an axial flow pump impeller. Shafts, bearings, seals and drives are discussed in a separate chapter. The last two chapters deal with design for difficult fluids, and codes and practices.

Variable discharge pump with low unload to secondary

Abstract: A load sensed variable output gear pump system including a pump within a housing, an inlet passage extending to a pump inlet and an outlet passage extending from a pump outlet. A secondary outlet passage is located in the housing and a bypass outlet passage is located in the housing and is connected to a reservoir. A load sensed passage is located in the housing and is connected to load pressure. First and second independent control devices are provided for controlling flow through the secondary outlet passage from the outlet passage.

Scroll compressor having a gear oil pump accommodating reverse rotation

Abstract: A reliable scroll-type compressor is provided which, even when the compressor is rotated in the reverse direction by the erroneous connection of the power source terminals for example, is prevented from establishing a vacuum state within the compression chamber and no damages occur in the addendum of the stationary scroll and the orbiting scroll. The compressor includes a gear pump which includes a pump case and a pump port. The arrangement of the present invention is such that the pump case alone rotates by 180 degrees upon the reverse rotation of the motor, so that lubricating oil which is at the bottom of a hermetic vessel can be ensured to be supplied by the gear pump to each sliding portion of the compressor.

Single screw extruder with gear pump

Abstract: A single-screw extruder has an integrated gear pump (6), which comprises two gear wheels (10, 11) in engagement with each other, the gear wheel (10) being pushed with a form fit onto the screw shank (2) and driven by it, while the other gear wheel (mating gear wheel) (11) is mounted to the side of the screw shank (2) in a continuation (7) of the barrel. In this arrangement, the gear wheels (10, 11) are surrounded on both their end faces by a stationary pump housing, which is arranged inside the screw barrel (1) and comprises two sealing plates (14, 15) which can be pushed onto the screw shank (2) and are connected with a form fit to the screw barrel (1). The sealing plates (14, 15) have openings for the screw shank (2) and the mating gear wheel spindle to pass through. Furthermore, on the sealing plates (14, 15) or on the screw barrel (1) level with the sealing plates (14, 15) there is provided at least one product passage window (18, 19), open towards the screw chamber.

Lubricant pump for a turbine

Abstract: A lubricant pump (24) for supplying pressurized lubricant to the main bearings (14) of a drive shaft (12) for a steam turbine (10) as shown in FIG. 1. A lubricant pump (24) is positioned between a governor (18) and an adjacent bearing (14) with the governor (18) and lubricant pump (24) being driven from the turbine shaft (12). The lubricant pump (24) has an outer housing (56) with a pair of opposed parallel mounting faces (58, 60) for mounting against a planar end face (48) of a bearing housing (44) on one side of lubricant pump (24) and an opposed planar face (38) of governor (18) on the other side of lubricant pump (24). Lubricant pump (24) comprises a rotary gear pump and may be easily installed on an existing turbine (10) having a governor (18) mounted on a bearing housing (44). Lubricant pump (24) includes gears ( 90, 92) to supply pressurized fluid through lubricant lines (30, 32) to bearings (14).

Foaming chemicals mixing apparatus

Abstract: PURPOSE:To make mixing ratio of water and foaming chemicals always const. even when there exists fluctuation of feeding pressure of water in an apparatus using differential pressure compounding pipe. CONSTITUTION:A part of a water feeding part 2a of a compounding pipe 1 branches and is connected with a gear motor 8 and a foaming chemicals pouring part 4a is connected to a gear pump 5 and the gear pump 5 is driven by means of the gear motor 8 and the foaming chemicals is poured into the compounding pipe 1 to mix it with water.

Drive assembly for a motor vehicle

Abstract: In a drive assembly for motor vehicles with an internal combustion engine which has a timing gear arranged in a case 18 with at least one chain 16 or a plurality of gears for driving a camshaft 8 and possibly a diesel injection pump, and with a transmission 2 driven by the internal combustion engine, the case 18 accommodating the timing gear is sealed off from the lubricating oil circuit of the internal combustion engine and the timing gear is lubricated by the transmission oil or, in the case of a hydraulic automatic transmission, by the automatic transmission fluid. This makes it possible to reduce the timing gear wear compared to the conventional lubrication of the timing gear by the engine lubricating oil and high-viscosity oil can be used, thereby reducing the noise generated.

Gear pump mounting assembly for thermoplastic extrusion line

Abstract: In a thermoplastic material extrusion line having a melt extruder, a gear pump, and a die aligned with one another, the gear pump is supported on a hinged articulable arm for swinging movement into and out of operative disposition in alignment with the extruder to simplify realignment of the gear pump with the extruder and the die whenever it becomes necessary to remove the gear pump from the line for maintenance or service.