Showing papers on "Gear pump published in 1999"

A gear pump and replaceable reservoir for a fluid sprayer

Abstract: A gear pump and reservoir device for a fluid sprayer comprises a pump housing (12) having a recessed portion for receiving and sealing thereto a fluid reservoir and a cavity for locating a drive motor (56) and gears (62, 64) therein. The recessed portion has a rigid conical projection (18) centered therein which has an orifice (20) extending into a pump inlet (22). The gear pump further includes a fluid container (36) mounted above the recessed portion of the pump housing to form a fluid reservoir. The fluid reservoir has a discharge valve (52) that is opened by engagement with the conical projection within the recessed portion to provide fluid communication to the pump inlet. A static head in the fluid reservoir maintains the gear pump in a primed state. A fluid line (30) leading from the gear pump to a sprayer head has a discharge check valve (34) located therein. The check valve has a cracking pressure higher than the static head of fluid so that fluid passes to the sprayer head only when the gear pump operates to increase pressure in the fluid line above the cracking pressure. There is also means for powering and operating the motor such that the gear pump provides a continuous flow of fluid to the sprayer head upon demand by a user.

Centrifugal & Rotary Pumps: Fundamentals With Applications

Abstract: Centrifugal and Rotary Pumps offers both professionals and students a concise reference detailing the design, performance, and principles of operation of the different pumps types defined by the Hydraulic Institute. From historical background to the latest trends and technological developments, the author focuses on information with real-world prac

Centrifugal and rotary pumps / fundamentals with applications

Abstract: INTRODUCTION CLASSIFICATION OF PUMPS CONCEPT OF A PUMPING SYSTEM Liquid Transfer Input Power, Losses and Efficiency System Curve Pump Curve CENTRIFUGAL PUMP-FUNDAMENTALS Affinity Laws Helpful Formulas Per Centrifugal Pump Triangles Quiz #1: Velocity triangles Performance Curves Quiz #2: How much money did a maintenance mechanic save his plant? Performance Modifications Quiz #3: A Valve puzzle Underfiling and Overfiling Design Modeling Techniques Specific Speed (Ns) GEAR PUMPS - FUNDAMENTALS Quiz #4: Gear Pump Capacity Cavitation in Gear Pumps Trapping Methods Lubrication User Comments MULTIPLE SCREW PUMPS Three Screw Pumps Two Screw Pumps User Comments PROGRESSING CAVITY (SINGLE SCREW) PUMPS Principle of Operation Pump Performance Considerations Power Requirements Fluid Velocity and Shear Rate Fluid Viscosity Inlet Conditions Guidance for Proper Selection and Installation Progressing Cavity Pump Applications Troubleshooting User Comments METERING PUMPS Definition Features Where Are Metering Pumps Used? Types of Metering Pumps Components of Metering Pumps Metering Pumps Selection Control and Integration Accessories Typical Applications The Advantages of Rotary Pumps Case History #1: Double Suction Centrifugal Pump, Suction Problem Quiz #5: Are Ns and Nss dependent on speed? Case History #2: Lube Oil Gear Pump, Noise and Wear Reduction Quiz #6: Doubling the Gear pump life in 10 minutes?! Case History #3: Progressing Cavity Pump Failures Troubleshooting "Pointers" as Given by Interviewed Pump Users and Plant Personnel Application Criteria and Specification Parameters Closing Remarks Appendices

Hydrostatically driven vehicle with retarder valve

Abstract: A vehicle having a hydrostatic drive and a hydraulic control apparatus, in which the hydrostatic drive has a variable displacement hydraulic pump and a hydraulic motor in a closed circuit, an internal combustion engine for driving the hydraulic pump and a variable displacement pump, producing a volumetric output flow, of an open circuit, and a retarder valve arranged in the open circuit and intended for the hydraulic absorption of braking energy The retarder valve has a valve and a pressure-limiting valve, connected thereto, for throttling the volumetric output flow of the variable displacement pump The variable displacement hydraulic pump, the variable displacement pump and the retarder valve are controlled by a digital electronic unit for the respective driving and working functions

Variable-delivery external gear pump

Abstract: A variable-delivery external gear pump comprising a casing, at least one rotatively driven pair of gears comprising two intermeshing spur gears, which form with shell surface areas of the casing and axial sealing surface areas a delivery space comprising a low-pressure side connected to a pump inlet port and a high-pressure side connected to a pump outlet port, and a piston, serving to rotatively mount one spur gear of the pair of gears, said piston being shifted relative to the other spur gear of the pair of gears so as to vary the delivery of the pump together with the one spur gear by charging the high-pressure side with fluid against the force of a return element, wherein formed in at least one axial sealing surface area adjoining a sealing land of the sealing surface area is at least one pocket connecting a zone of deepest tooth engagement of the spur gears to either the pump outlet port or the pump inlet port.

External gear pump with drive gear seal

Abstract: A metering pump includes a set of externally-toothed gears, with a first of the gears, the drive gear, having a central opening to receive a drive shaft. The gears are supported within a housing defined between first and second housing plates. The first and second housing plates each have central openings aligned with the central opening in the drive gear, and inner wall surfaces adjacent opposite side surfaces of the gears. The first and second gears are rotatably supported within the housing such that the rotational axis of the gears are parallel to one another, and certain of the gear teeth intermesh together when the gears rotate. A first port in the housing provides an inlet fluid flow to an inlet side of the meshing gear teeth, while a second port provides an outlet fluid flow from an outlet side of the meshing teeth. An annular resilient, face-type lip seal is disposed against each side surface of the drive gear, surrounding the central opening in the gear. The lip seals are located in annular grooves formed in the opposing surfaces of the adjacent housing plates surrounding the central openings in the plates, and fluidly seal to the respective surfaces of the first gear during rotation of the gears to prevent fluid leakage into the central opening in the gear.

Hydrostatic circuit for harvesting machine

Abstract: The multiple pump apparatus includes first and second variable displacement closed circuit pumps. The multiple pump apparatus pressurizes fluid to be subsequently supplied to drive load devices. The first and second pumps each have fluid communication lines connected to load devices through flow control valves. Each of the pumps has a swashplate for varying its displacement. The swashplates are of the over-center type, enabling each pump to supply pressurized fluid in either direction, thus providing both forward and reverse function to the load devices. The first pump has its fluid communicating lines connected to fluid communicating lines between first and second two-position four-way flow control valves. The opposite side of the first flow control valve has fluid communicating lines connected to a load device which drives a harvesting mechanism, in this case a rotor motor. The opposite side of the second flow control valve has communication lines connected to the circuit for driving the load device for the propel function, in this case, the propel motor(s). In this way, the combined flow from the two pumps enables the vehicle to attain high speed operation for roading without the need for a single large fluid displacement propel pump to support this performance requirement.

Rotational output control system

Abstract: A gear pump mechanism shown in a variety of applications to control rotational output. Control of the output from the gear pump and feed to the gear pump of hydraulic fluid or oil can be controlled to establish conditions from free wheeling to fully locked. The gear pump includes a sun gear and planetary gears. The sun gear is attached to an output shaft while the planetary gears are rotatably mounted to the pump housing. Through rotation of the housing and control of the flow through the gear pump, relative rotation of the output shaft can be determined. Applications of rotational output control systems using the gear pump mechanism provide adjustable torque limiters, variable rate clutches, differentials, brakes, CVT transmissions, four wheel drive systems and forward and reverse variable rate clutches with no gear backlash.

Mechatronic micro devices

Abstract: Nowadays, novel trends can be observed in micro system technology: Micro systems more and more develop into stand-alone devices for multi-purpose applications, and they do not only comprise detector elements but really interact mechanically by micro actuators with their surroundings. A modular concept especially for high performance actuators which proved to be a main prerequisite for these developments is illustrated in the contribution. With dimensions of a few millimeters, piezo-driven valves and membrane pumps overcome fluid pressures of 1,000 hPa. Electromagnetic motors generate torques of 7 to 100 /spl mu/Nm which are multiplied by adapted micro gears. Gear motors serve as a key unit for high force micro positioning systems or micro gear pumps which are first examples for the device level. With the integration of electronics and optics the actuator performance can considerably be increased by establishing a feedback control and the systems become really micro mechatronic devices. Additionally, interface components like electrical and fiber-optical connectors with pitches as small as 250 /spl mu/m, special gears and miniaturized clamping structures enable the implementation of complex optical fiber networks, micro robots or chemical micro reactors from these mechatronic devices in a construction kit. A wide range of 3D-micro fabrication techniques, from design and simulation, micro spark erosion (/spl mu/-EDM) for the prototypes to mass technologies like LIGA including injection molding, allows a fast commercialization into "micro product lines" and will round the circle of the considerations on the mechatronic micro devices.

Pump assembly comprising two hydraulic pumps

Abstract: The invention relates to a pump assembly comprising a vane-cell pump and a second hydraulic pump which is driven together with the same. The vane-cell pump has a suction area in which first pressure chambers between the vanes and second, rear pressure chambers enlarge behind the vanes, and has a pressure area in which the pressure chambers become smaller, and in which the pressure chambers are fluidically connected to a pressure output. The vane-cell pump is provided, in particular, for delivering hydraulic fluid under a relatively high pressure to the adjusting cylinder of a hydromechanical transmission of a motor vehicle. The second hydraulic pump has positively-driven displacement elements and is provided for delivering hydraulic fluid of a circuit with a relatively low system pressure, especially of a lubricating oil circuit of the motor vehicle. According to the invention, the rear pressure chambers of the vane-cell pump are connected in the suction area to the pressure output of the second hydraulic pump so that the vane-cell pump can commence delivery of hydraulic fluid also in the instances of low outside temperatures and of hydraulic fluid which is already highly viscous at low driving motor speeds.

Recirculating flow path for gear pump

Abstract: A gear pump includes a pump body having a pair of cylindrical gear chambers, and high pressure and low-pressure fluid ports into the chambers. A pair of cover plates enclose the open ends of the pump body. A drive gear on a drive shaft and a driven gear on an arbor shaft are rotatably supported on a pair of bearing assemblies within the gear chambers, with the drive shaft extending through an opening in at least one of the cover plates for rotation of the gears. A recirculating flow path is provided to draw fluid from the high pressure fluid port along the sides of the gears, between the bearings and the sides of the gears, axially through the bearings from the inner side of the bearings to the outer side of the bearings, and through channels formed in the respective adjacent cover plates to direct the fluid to a pair of return bores in the pump body. The return bores are parallel to one another and to the rotational axis of the gears, and tangentially intersect the low-pressure fluid port in elongated, arcuately-extending elliptical openings to direct the fluid into the central region of the intermeshing gear teeth.

Rotary pump apparatus and method

Abstract: Rotary pump apparatus includes a pump housing having a drive gear and a driven gear positioned in the interior of the housing. A fluid-flow passageway provides fluid to a volumetrically changing space located between meshing gear teeth to prevent the pressure in the space from dropping below the vapor pressure of the fluid.

A New Type of Hydraulic Actuator Using Electrorheological Fluids

Abstract: Electrorheological Fluids (ERF) are usually used in semi active damping elements, e.g. shock absorbers or engine mounts because of their continuously controllable shear stress. A totally new field of application may be achieved, if an ERF is used as a hydraulic fluid and not only as a control medium. In this case a fundamental need is the capability to produce a volume flow by using normal hydraulic pumps, e.g. gear pumps. The ERF and the hydraulic components both must have a long lifetime without unusual wear. Bayer AG has developed an ERF based on soft crosslinked PU-particles dispersed in silicone oil. These ERF are characterised by a low basic viscosity, a high ER-effect and a moderate conductivity. Compared with previous ERF where hard inorganic particles were used, the new fluid is not abrasive. It is foremostly this characteristic which gives the possibility of using the ERF in hydraulic systems with high shear rates and high shear stresses. The usage of ERF as hydraulic fluid allows the construction of proportional valves without mechanically driven parts. The control of the pressure drop over the valves is realised directly by an electrical signal. It is possible to realise actuators with very fast response times since the reaction time of ERF is within milliseconds. For demonstration purpose Bayer AG has built an actuator which is controlled by an electrorheological valve-block. The calculation of the dimension of this actuator and the valves will be shown and the realised response time will be demonstrated.

Drive divice for hybrid vehicle

Abstract: PROBLEM TO BE SOLVED: To dissolve a problem that high noise is generated as a result of a motor output shaft being axially vibrated owing to a fact that torque generated occasioned by a torque fluctuation due to explosion vibration transmitted from an engine and smooth torque by a high inertia amount of the rotor of an electric motor are transmitted to a drive gear for a motor, a fluctuation in a tooth flank pressure occurs to the gear and the gear consists of a helical gear SOLUTION: The drive gear 29 has two ends supported at cases 10 and 8 through bearings 55 and 56 The output shaft 7 of the electric motor 5 has one end supported at a rear cover 18 through a bearing 61 and the other end supported at a bearing 56 through a drive gear boss part 29b Vibration in an axial direction of the gear 29 is absorbed by splines 7g and 29c and not transmitted to the output shaft 7 COPYRIGHT: (C)2001,JPO

Drive unit for power car

Abstract: PROBLEM TO BE SOLVED: To obtain high driving torque by a compact constitution and small structure space by providing a transmission device connecting with the front side of a differential gear with the axial direction through part and passing one of output shafts of the differential gear through the through part. SOLUTION: Rotation of a rotor 9 drives a sun gear 25 of a planetary gear 23 for enhancing torque integrated to a rotor shaft 17 via the rotor shaft 17, the sun gear 25 is supported by an engaging part 30 arranged in a fixed type of a hollow gear 31, a planetary gear 27 engaged to the sun gear 25 is driven and a planetary carrier 29 carrying this gear 27 is rotated. A differential gear casing 35 and a differential shaft 37 which are fixed/coupled to/with this carrier 29 are rotated, rotatable differential pinion 39 and differential side shaft gear 41 are engaged to the shaft 37, and output shafts 43, 45 are driven by a differential gear 33. The output shaft 45 is rotatably supported within the rotor shaft 17 as a hollow shaft 19. Therefore, the drive unit can be arranged between drive wheels by a compact structure. COPYRIGHT: (C)2000,JPO

Speed-sensitive differential

Abstract: A speed-sensitive, limited-slip, geared differential mechanism for transferring driving torque to each of two torque output shafts. Side gears located in a planetary gear carrier housing, one side gear being drivably connected to one pump member of a positive displacement pump and the planetary gear carrier being connected to another pump member. The pump is supplied with silicone fluid from a fluid reservoir. The pump creates a hydrostatic torque bias when differential motion of the side gears occurs as silicone fluid circulates through the pump.

Drive head assembly

Abstract: The present invention provides a pump drive assembly for a deep well, submersible, progressing cavity pump that includes an internal hydraulic pump for slowing the counter rotation of the polished rod induced by recoil in the sucker rod. The pump drive assembly includes a housing enclosing a hydraulic fluid reservoir and a gear chamber separate from the reservoir. A drive shaft extends into the housing and includes a drive gear integral with or keyed to the drive shaft. A main shaft also extends into the housing and includes a main gear integral with or keyed to the main shaft. The main gear is engaged with the drive gear within the gear chamber, where the gear chamber includes an inlet and an outlet channel providing fluid communication between the gear chamber and the reservoir, so that the gears form a reversible gear pump within the housing. The reversible gear pump operates to pump hydraulic fluid from the reservoir into the gear chamber and back into the reservoir. During normal operation of the drive assembly, the gear pump will operate in the forward direction; but when the polished rod is caused to recoil, the gear pump will be caused to operate in the reverse direction. Therefore, the pump drive assembly also includes a flow resistor coupled to at least one of the inlet and outlet channels for retarding the flow of the hydraulic fluid when the gear pump is operating in the reverse direction, thus slowing counter-rotation of the polished rod during recoil.

Power steering power pack motor/pump mounting bracket

Abstract: An electro-hydraulic gear pump power pack (10), including a hydraulic pump disposed in a pump reservoir (12) and an electric motor disposed in a motor housing (14), are secured together to form a single assembly. The pump reservoir (12) and the motor housing (14) are secured together by a pair of mounting brackets (18) that also serve to attach the power pack (10) to a vehicle structure (20).

Countershaft transmission with constant mesh reverse gearing

Abstract: A transmission comprising gear case bottom part 72 and rear cover 73; shaft 19 supported on bearings 34 and 37; shaft 20 supported on bearings 33, 38 and 39; shaft 21 supported on bearings 35, 36 and 40 and shaft 22 supported on bearings 41 and 42. Shaft 19 carries a cluster of seven gears 1, 2, 3, 4, 5, 6 and 7 all of them being integral part of the shaft. These gears are positioned along the shaft from the smallest gear 1 to the largest gear 7. Each gear on shaft 19 is permanently meshed with a gear on either shaft 20 or shaft 21. Gear 1 is meshed with gear 8, gear 2 with gear 9, gear 3 with gear 10, gear 4 with gear 11, gear 5 with gear 12, gear 6 with gear 13 and gear 7 with gear 14. Gear 17 on shaft 21 and gear 18 on shaft 20 are meshed with gear 16 on the output shaft 22. All gears on shafts 20, 21 and 22 in FIG. 1 and gear 65 on shaft 61 in FIG. 2 are rotating on angular contact ball bearings with their inner rings fixed to the shafts. Gears are selected using cone or multiple plate disk clutches driven by hydraulic actuators.

Electrostatic coating device

Abstract: PROBLEM TO BE SOLVED: To supply a fixed amount of coating to be discharged from a storage- type pump to a coating machine in such a state that a high voltage is prevented from leaking to a coating source side and thereby, make a coat finish better. SOLUTION: This electrostatic coating device is of such a construction that a coating is supplied to a storage-type pump 19 through a coating hose 33 which constitutes an insulating coat flow path from a color switching valve device 34, and a gear pump 9 is arranged as a positive displacement pump on a coating outflow hose 8 between the storage-type pump 19 and an electrostatic coating machine 1. Under this construction, the coating contained in a coating hose 33 is drained and the coating hose 33 is cleaned to form a high voltage shut-off part. Thus it is possible to prevent high voltage applied to the coating from leaking. Further, the coating discharged from the storage-type pump 19 can be supplied to the electrostatic coating machine 1 at a constant flow rate complying with coating conditions by a gear pump 9 to make a coat formed by applying the coating uniform.

Grooved rotor for an internal gear pump

Abstract: A rotor for an internal gear pump adapted to improve the lubrication of the internal gear parts. A radial groove is added to the inner face of an internal rotor. The groove extends radially between the center of the rotor and an outer diameter of the rotor. The groove provides a communication channel between the outer circumference of the rotor and the parts located within the rotor's inner diameter, namely the idler gear and idler pin. The disclosed grooved rotor improves the flow of fluid to the interface between the idler gear and the idler pin of a typical internal gear pump. Should the lubricating properties of the fluid be reduced and/or the operating pressures of the pump increased, the improved rotor design will provide lubrication of the internal rotary parts, thereby decreasing the friction among the parts and extending the overall productive life of the pump.

Hydraulic control drive, e.g. for clutches, gearboxes, has arrangement for detecting level of fluid in reservoir container from duration of time for which pump is switched on

Abstract: The drive has a controller (28,28a) and a pump (41) driven by a drive (42) to pump hydraulic fluid from a reservoir container (40) for use in at least one control cylinder (21). The level of fluid in the reservoir container is determined by detecting the duration of time for which the pump is switched on.

Internal gear pump

Abstract: PROBLEM TO BE SOLVED: To increase the pump efficiency of an internal gear pump. SOLUTION: A water repellant treatment is applied to both axial end surfaces 191 of an outer rotor 121, both axial end surfaces 192 of an inner rotor 122, and the internal surface 193 of a case 111 opposed to the axial end surfaces of the inner and outer rotors 122 and 121 in those areas where volume of a space formed by the engagement of the inner rotor 122 with the outer rotor 121 is increased. Also the water repellant treatment may be applied to the internal surface of a case 111 opposed to the axial end surfaces of the inner and outer rotors 122 and 121 in those areas where volume of a space formed by the engagement of the inner rotor 122 with the outer rotor 121 is reduced and to the external surface of the outer rotor.

Spinning machine and its operation control

Abstract: PROBLEM TO BE SOLVED: To provide a method for performing an operation control of a spinning machine without a fear of wasting a molten resin raw material on performing an exchange operation of a spinneret or a filter, capable of preventing the generation of a loss of the molten resin raw material and stably performing the operation control while performing the exchange work of the spinneret or the filter SOLUTION: This method for performing an operation control comprises detecting the outlet side pressure of a gear pump for a main flow passage 6 with a first pressure-detecting device 11, adjusting the ejection amount from the gear pump 6 with a first pressure-adjusting device 15 based on the detected pressure, also detecting the inlet side pressure of the gear pump 6 with a second pressure detecting device 12, adjusting the raw material supplying amount to a biaxial extruder 2 from a feeder 4 with a second pressure-adjusting device 17 based on the detected pressure, and further, installing a ratio-setting device 19 for controlling the ratio of the raw material supplying amount from the feeder 4 to the extruding amount from the biaxial extruder to a previously set constant ratio

Extrusion molding equipment

Abstract: PROBLEM TO BE SOLVED: To suppress the fluctuations in the resin pressure at the inlet of a die even during the backwashing of a screen to prevent the lowering of the yield of a product. SOLUTION: In this extrusion molding equipment, a raw material feeder 2, a screw extruder 1, a screen replacing unit 4 fitted with backwashing function capable of backwashing a part of a plurality of screens 1, a gear pump 5 and a molding die 6 are arranged in this order from an upstream side and a gear pump inlet pressure gauge 12 for detecting resin pressure is arranged between the screen replacing unit 4 and the gear pump 5. The fluctuations of the pressure of a resin generated during backwashing are detected by the gear pump inlet pressure gauge 12 and an extrusion control device 21 having a pressure control part 23 for controlling the number of rotations of the screw 1c of the extruder 1 on the basis of the detection signal of the pressure gauge 12 is provided.

Method of metering a liquid additive into a liquid silicon-containing material

Abstract: A method of metering a liquid additive into a liquid silicon-containing material. The method comprises feeding a liquid silicon-containing material through a first rotary gear positive displacement pump (1) causing a driving mechanism (3,4,5) connecting the first rotary gear positive displacement pump (1) to a second rotary gear positive displacement pump (2) to rotate. The rotating driving mechanism (3,4,5) causes the second rotary gear positive displacement pump (2) to pump a liquid additive at a volume flow rate proportionate to the volume flow rate of the liquid silicon-containing material through the first rotary gear positive displacement pump (1).

Gear and gear pump

Abstract: PROBLEM TO BE SOLVED: To form a cylindrical gear in such a constitution that work is facilitated and productive efficiency is improved without generating thrust. SOLUTION: Cylindrical gear 1, 2 are taken as zerol circular gears whose tooth trace L is a circular cone and helix angle α on a center (c) of a face width is zero. A tooth profile may be a free curve including an involute. Work of a gear with a circular tooth trace is carried out in such a way that a gear raw material is rotated in reciprocation so as to unify circumferential speed with linear velocity of movement in a horizontal direction while moving in reciprocation the gear raw material so as to position a tooth tip of a bite arranged eccentrically with a tool shaft which is rotated and vertically moved on a center of the face width to a top point of the gear raw material at all times. The tooth profile is freely set by a cut condition of the bite. The zerol cylindrical gear is applied to, for example, a gear pump, and also it is widely applied to various kinds of gear transmitting devices such as decelerator.

Planetary gear speed reducer and manufacturing apparatus therefor

Abstract: PROBLEM TO BE SOLVED: To reduce backlash between both gears while the meshing accuracy with a planetary gear is heightened by forming an internal gear of an annular internal gear of a planetary gear mechanism into a helical gear by rotary broaching. SOLUTION: This planetary gear speed reducer 100 is so constructed that an input shaft 20, a first and a second planetary gear mechanisms 30, 40 and an output shaft 50 are disposed coaxially with the axis C of rotation in a housing 10. The first planetary gear mechanism 30 is so constructed that a first sun gear 31 rotated integrally with the input shaft 20, a first annular internal gear 32 in which a part of the inner peripheral surface of a second housing 12 is fitted to be fixed, and three first planetary gears 33 mesh and revolve around the axis C of rotation, and further these first planetary gears 33 are respectively supported to freely revolve by a planetary gear carrier 34. At this time, the internal teeth of the first annular internal gear 32 are formed into helical teeth by rotary broaching.