Showing papers on "Gear pump published in 1978"

Liquid power driven coating apparatus

Abstract: A coatings application apparatus pumps liquid paint through a flexible conduit within a rotary variable displacement peristaltic pump to a conventional applicator head. Through constant speed rotating lobes peristaltic action squeezes coating liquid within the conduit through the paint applicator control handle and applicator. The control handle permits changes in the paint flow rate. Upon constriction of the conduit within the control handle, flow rate is reduced, back pressure develops with resulting tube distortion. Distortion levered forces act upon a pre-set loaded pump spring. Variation in pump displacement results. The liquid flow rate within the supply conduit is inversely proportional to the back pressure so developed. If fluid flow is completely arrested by full supply tube constriction, back pressure becomes a maximum and pump displacement becomes zero. The pump continues to operate, however, at constant R.P.M., requiring no high starting torque. The pump unit employes two reverter train speed reduction systems in tandem. A conventional planetary or epicyclic gear system provides a first reduction in R.P.M. The pump rotor element itself, as a secondary reduction unit, allows economy in selection of a high speed, low power, motor drive for the peristaltic pump.

Gear pump or motor units with sleeve coupling for shafts

Abstract: A gear pump or motor wherein at least two pump or gear units are arranged in coaxial relationship and have their axially inwardly extended driven and driving shafts journalled in a common intermediate casing, the driving shafts being splined together with an internally splined sleeve. The inlet port opened in the intermediate casing is communicated through low-pressure passages with the pump chambers of the respective pump or motor units (and with the assembly chamber or pocket formed to accommodate the opposing ends of the axially inwardly extended driving shafts). The diameter of the inlet port is made larger than the size of the sleeve for interconnecting the driving shafts so that the sleeve may be inserted through the inlet opening into the assembly chamber or pocket and interconnect the driving shafts. Thus, in assembly the interconnection between the driving shafts may be much facilitated. Furthermore, the correct axial alignment between them may be ensured because the axially inwardly extended driven and driving shafts are journalled in common holes or bores, respectively.

Gear drive for gas turbine engine

Abstract: A drive system for a multiple gas turbine engine system includes power output shafts from first and second gas turbine engines, each power shaft connected to drive a load and each engine including a load sharing cross-over shaft for power transfer from one of the engines to the other engine; a right angle gear box assembly connects each of the power output shafts to the cross-over shaft and each of the right angle gear box assemblies includes first and second load sharing gear paths including tooth geometry in an input bevel gear configured to produce a thrust reversal so that for normal direction torque transfer the input bevel gear thrust is in a direction to load mesh points in both gear paths and for a reversal of torque direction from input to output gears the input gear thrust is reversed so that the input gear will be directed into a tighter mesh to take out normal backlash in the system so that reverse meshed torque paths will be maintained in each of the first and second gear paths to maintain a sharing of torque in both forward and reverse directions of drive within the gear box assembly thereby to reduce weight and size of gear components of aircraft or other lightweight drive systems with reverse driving modes.

Hydraulically controlled differential

Abstract: A planetary gear differential has a pair of side gears and two pairs of composite planet gears rotatably carried by a rotatable carrier. Each pair of composite planet gears includes meshing impeller gears and drive gears meshing respective side gears. Hydraulic control means for limiting the differential speed of the side gears comprises two closed hydraulic circuits located in the carrier. Each circuit includes a gear pump chamber having the meshing impeller gears of one pair of composite planet gears disposed therein, and a pair of opposed unidirectional restrictions located in conduits leading from opposite radial sides of the gear pump chamber to an inner annular sump common to both circuits.

Shock control arrangement in hydraulic control system of automatic power transmission

Abstract: In an automatic power transmission having a transmission mechanism including a fluid operated frictional unit to be actuated to make shifts between predetermined forward drive gear ratios or between the neutral and reverse drive gear positions, there is provided a hydraulic transmission control system having incorporated therein a shock control arrangement by means of which a fluid pressure lower than the fluid pressure to be supplied to the frictional unit during shifting between the neutral and reverse drive gear positions is supplied to the frictional unit during shifting between the predetermined forward drive gear ratios.

Self-locking differential gear for motor vehicles, especially bevel gear differential gear

Abstract: A self-locking differential gear for motor vehicles with a rotating differential gear housing which accommodates the differential gears which in turn engage with driven gears arranged on the axle shafts; means for locking the differential gear which are coordinated to each driven gear and which are operatively connected with the driven gear are in the form of an inertia member that is rotatable and axially movable by means of a thread with respect to the driven gear against the action of return means while the inertia member is operatively connected with double-acting locking means.

Gear pump with means for dispersing gas into liquid

Abstract: A gear pump for dispersing a gas into a liquid is provided with mixing means for improving the uniformity of the dispersion. In preferred form, the mixing means comprises a series of fixed, shallow, blind cavities that open to the pumping cavity between the liquid inlet and the outlet, and which are positioned to be "wiped" by the gear teeth as the gears rotate. The alternate connection and disconnection of the intertooth spaces to these cavities as the gears rotate establishes motion or turbulence of the gas/liquid mixture within the intertooth spaces, and surprisingly improves uniformity of the dispersion.

Method and apparatus for the injection of additives into plastics material

Abstract: This invention provides a method and apparatus for injecting an additive into a stream of homogenized plastics material. The apparatus includes a homogenizing means such as a screw conveyor for the plastics material and at least one injector for injecting an additive, usually a colorant, into the boundary layer only of the homogenized plastics material prior to the latter being subjected to mastication in a gear pump. The additive is injected into the plastics material at such a position in the boundary layer that as the material passes through the gear pump the additive is mixed substantially wholly with the boundary layer of plastics material and for this purpose the injection of additive is at a position such that it passes through the gear pump in the region of the intermeshing gears of the pump.

Bevolute gear system

Abstract: The present invention relates to a bevolute gearing system which transmits torque between non-intersecting shafts at right angles to each other. The bevolute gear system includes a pinion gear which is flat and in one plane. The pinion gear is designed to include teeth which are shaped in the form of an involute spiral. The bevolute gear system includes a second gear which is also designed to include teeth which are shaped in the form of an involute spiral. The second gear is mounted on a non-intersecting axis at a right angle to the axis of the pinion gear. The bevolute gearing system of the present invention reduces the thrust loads to negligible values for the bearings of both the pinion gear and the second gear. In addition, higher mechanical efficiencies, wider tolerances on alignment of the gears, interchangeability between the gear and the pinions to produce different ratios and a substantially eliminated gear noise are a few of the many advantages disclosed in the present invention.

Transmission equipped with auxiliary speed changing gear

Abstract: A transmission has a drive gear shaft disposed coaxially with an input shaft which extends in parallel with an output shaft. Two pairs of meshing gears, one of which constituting a gear train of high speed gear ratio while the other constitutes a gear train of low speed gear ratio, are arranged for the torque transmission from the input shaft to the drive gear shaft. The drive gear shaft is connected to the output shaft through a plurality of meshing speed gear pairs such as first gear pair, second gear pair, third gear pair and fourth gear pair, as in the ordinary transmission. In operation, one of the gear trains of the high speed and low speed gear ratios is selectively engaged, so that each of the speed gears may be operated at either the high speed range or the low speed range. The transmission is small-sized, light weight and less expensive, thanks to the coaxial arrangement of the input shaft and the drive gear shaft and, therefore, can suitably be used in small-sized vehicles having limited installation space preserved for the transmission.

Apparatus for controlling pressure distribution in gear pump

Abstract: A pressure plate provides metering grooves in a face thereof contiguous to the gears of a gear pump. The grooves communicate certain pockets between adjacent gear teeth with other such pockets so as to meter fluid from pockets in which fluid is trapped at relatively high pressures to pockets in which fluid is trapped at relatively low pressures, thereby controlling the pressure distribution.

Hydraulic gear pump with recesses in non-working gear flanks

Abstract: A gear pump has a pair of externally meshed gears, and an inlet port and an outlet port on respective sides of the zone of mesh of the gears. The teeth of the gears have their non-working flanks relieved so as to increase an inter-tooth volume lying between two adjacent contact areas of the gears, this inter-tooth volume first decreasing and then increasing as the gears rotate. The relief of the non-working flanks is such that each successive inter-tooth volume communicates with the inlet port before that volume increases from its minimum value.

System for forming and dispensing a resinous foam

Abstract: A system and method is disclosed for continuously producing and dispensing foam material including storage containers with respective delivery lines for delivering, via separate motor driven pumps, a foaming agent solution and curable synthetic resinous material to a mixing gun. An air compressor supplies compressed air which is first heated and then directed to the mixing gun wherein the components are mixed in the proper proportions to produce and dispense foam to the point of placement. The system includes an electric motor which conjointly drives the separate pumps which supply the constituent materials to the mixing gun under predetermined constant pressures and continuous flow conditions so as to produce a homogeneous and continuous foam product of desired density generally free of streaks and inconsistencies. In one embodiment, pumping of the materials is accomplished by conjointly driven diaphragm piston-type pumps connected to a gear box of desired gear ratio and driven by the electric motor in a manner to provide high torque with relatively low motor power. In a second embodiment, pumping is accomplished by conjointly driven gear pumps in which at least one gear is of a type having internal teeth for pumping.

Variable gear ratio transmission

Abstract: A constant meshed, infinitely variable gear ratio transmission using relatively low pressure, low volume hydraulic systems to control the transmission gear ratio. The transmission includes a gear box having an input and output shaft. The gear box houses two sets of planetary gears which couple the input and output shafts together. A pinion gear is fixed to each shaft. A set of planetary gears mesh with each pinion and a plurality of planetary gear shafts connect the corresponding planetary gears of each pinion together. A cage is rotatably supported in the housing. A first hydraulic system controls the rotation of the cage. A second and independent hydraulic system controls the rotation of the planetary gear shafts by selectably controlling the rotation of the cage and the rotation of the planetary gear shafts so that the gear ratio for the transmission may be intermediately selected. A clutch mechanism is used to selectably engage the control system for the cage.

Gear pumps with low pressure shaft lubrication

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.

Apparatus for controlling operation of fluid pressure raising system

Abstract: An apparatus for controlling the operation of a fluid pressure raising system having a motor and a centrifugal fluid machine adapted to be driven by the motor. The apparatus has an overdrive gear disposed between the motor, which is typically an electric motor suited for the commercially available electric power, and the centrifugal fluid machine. The overdrive gear consists of two gear trains or pairs having different overdrive ratios, each consisting of a gear and a pinion meshing with the gear, and a clutch adapted to selectively switch over the gear pair taking part in the torque transmission between the output shaft of the motor and the impeller shaft of the centrifugal fluid machine, from one gear pair to the other gear pair and vice versa. Thus, the overdrive gear can transmit the power of the motor to the impeller at two different overdrive ratios. The clutch is adapted to be actuated in response to a signal representative of an external condition of the fluid pressure raising system, which signal is delivered by a detector.

Simulation of blood flow by a hydrodynamic generator.

Abstract: Physiological flows are produced by a volumetric gear pump. The motor-pump group is controlled by an amplifying comparator, and produces a flow whose rate follows the control signal. This signal is delivered by a synthetizing generator and its shape, amplitude, and frequency are adjustable. This hydrodynamic generator supplies a test bench on which the modifications of flow patterns induced by models of vascular stenoses are studied. The study of the velocity distribution has been effected with a pulsed-Doppler ultrasonic velocimeter.

Wind driven heating system

Abstract: An apparatus for converting wind energy to heat is disclosed which includes a wind powered turbine and a positive displacement gear pump which is powered by the turbine and serves to pump a fluid through a flow restricting orifice. This fluid exits from the orifice at a high rate of flow, and the kinetic energy of the fluid flow is converted into heat by a diffuser which is adapted to slow the flow rate of the fluid. In this apparatus the energy consumed by the constant displacement pump is substantially the same function of turbine shaft speed as is the available wind energy, and, therefore, the apparatus of this invention functions efficiently at a wide range of wind speeds. Furthermore, since the wind energy is converted to heat, a relatively low cost constant displacement pump may be used. Internal pump leakage, which is generally regarded as a drawback of low cost pumps, only serves to further heat the fluid being pumped, and in this application does not degrade the efficiency of the apparatus.

Crescent gear pump or motor having bearing means for supporting the ring gear

Abstract: A gear pump or motor comprising a body having a cavity with high pressure and low pressure ports. A pinion, an internally toothed ring gear meshing together, a filling member interposed between pinion and ring gear and an arcuate bearing member are housed within the cavity. The pinion has a shaft which is journalled in the body. The arcuate bearing member is interposed between the periphery of the ring gear and the body wall near the low pressure port and yieldingly supports the ring gear such that the latter can shift in a direction of a plane of eccentricity containing the axis of rotation of the pinion and the ring gear. The arcuate bearing member defines, at its outer face, an area of low pressure, which is smaller than a further area of low pressure at its inner face which areas of low pressure are connected to one another. The filling member has a sickle-shaped cross section with a tapering end and a rounded end and which is mounted for pivotal movement and axial shifting movement transversely to the pivot axis and to the longitudinal extension of the filling member.

Gear pump, gear and method

Abstract: A relatively simple gear-forming process is disclosed, which enables the production of a set of gears that is especially useful for a particular type of gear pump, and which also produces a set of gears which operates with a high degree of rolling contact. The gears are produced by first forming an initial cutter gear having teeth with cylindrical tips supported by narrow supports, and using this initial cutter on a gear shaper to cut a first gear having bullet-shaped teeth. The first gear can then be used as the cutter on a gear shaper to cut other gears with bullet-shaped teeth or to cut gears with pole-shaped teeth. In a gear pump wherein fluid is forced through an axial passage opening into the space between teeth of the sun gear, the sun gear is formed with pole-shaped teeth while the planetary gear is formed with bullet-shaped teeth.

Reversible gear pump with invariant flow direction

Abstract: A gear pump for unidirectionally transporting a fluid such as oil has a stationary housing with an inlet port and an outlet port on opposite sides of the axis of a cylindrical chamber in which a ring with an eccentric inner periphery is rotatable through an arc of 180° between two limiting positions. Freely rotatable within the inner ring periphery is an annular outer rotor with internal gear teeth entrainable by a driven inner rotor with external gear teeth, the latter numbering one less than the internal gear teeth of the outer rotor. A face of the ring has one or more shallow depressions open toward the outer rotor, each depression being spanned by a leaf spring which is anchored to the ring and defines with the outer periphery of that rotor a wedge-shaped gap diverging symmetrically toward its ends to form alternate lodgments for a rotary coupling member such as a ball or a roller. With the ring in one of its limiting positions and the rotors being driven in a direction in which the pumping spaces formed between the coacting rotor teeth move the fluid from the inlet port to the outlet port, the coupling member lies free or under light spring pressure in the downstream lodgment as seen in the direction of rotation. When the rotor drive is reversed, leakage fluid present at the contact surface between the outer rotor and the ring builds up sufficient pressure to drive the coupling member toward the narrow waist of its gap to entrain the ring into its other limiting position in which it is arrested as the coupling member moves past that waist into its opposite lodgment.

Drive gear for automobile

Abstract: PURPOSE: To obtain smaller size of driving gears and to increase durability of the components by arranging an output gear between an underdrive gear and an epicyclic gear train of the overdrive gear and in the same axial direction as theirs. CONSTITUTION: A carrier 45 as an input element of an epicyclic gear train 41 of an overdrive gear 13 has an axial part 80 which extends by a given length toward the axial direction of the counter shaft 41 as an output means of an underdrive gear 12. The axial part 80 communicates with the counter shaft 40 through a spline 82 on the internal circumference of the axial part. An output gear 53 is arranged between the underdrive gear 12 and the overdrive gear 13 and in their axial direction. The output gear 53 is supported through bearings on the external circumference of the axial part 80. COPYRIGHT: (C)1979,JPO&Japio

Gear pump with transmission gearwheel adjustment

Abstract: A gear pump of the kind in which auxiliary gearing is relied upon to produce synchronized movement between intermeshed pumping gears includes one gearwheel of the auxiliary gearing mounted on a shaft means are provided for supplying hydraulic fluid under pressure to an interface between the gearwheel and the shaft so as to allow the gearwheel to be expanded hydraulically in order to effect relative angular adjustment between the gearwheel and the shaft for locating the pumping gears at their required relative angular positions.

Epicyclic gear system and driving means therefor

Abstract: An epicyclic gear system and driving means therefor comprise three planetary gears disposed within a sealed compartment to form two separate volumes; the planetary gears comprise a primary planetary gear and peripheral planetary gears and mesh with one another and with a stationary ring gear in said compartment. A rotor, eccentrically mounted with respect to the ring gear, is attached to the primary planetary gear. A fourth planetary gear is attached also to the rotor and is driven thereby in engagement with a stationary sungear. The fourth planetary gear is fixed to the primary planetary gear which is attached to the rotor and engages in planetary circular and rotary motion under the drive of the rotor and thereby furnishes a positive rotational impetus to the peripheral planetary gears. Ingress and egress ports communicating with the separate volumes defined by the compartment and the first planetary gears may be used for fluid inlets and outlets in conjunction with use of the system as a pump, a motor, an engine, or as a drive for a pump or other machine.

Bidirectional driving mechanism

Abstract: In a bidirectional driving mechanism comprising a rack, two pinions meshing with the rack, and gear trains through which power is transmitted respectively to the pinions from a common driving source, at least one gear of the gear train is formed as a ring gear and a plurality of variable volume oil chambers containing pressurized oil are formed between the ring gear and the shaft thereof so that driving torque is transmitted from the ring gear to the gear shaft through the oil chambers.

Power divider for vehicle

Abstract: PURPOSE:To accomplish miniaturization with less number of component parts of the power divider by means of one versatile gear serving as low and high transmission devices and an output shaft. CONSTITUTION:This power divider is composed of a low speed counter drive gear 41 mounted rotatively to an input shaft 10 connected to the output shaft 90 of a transmission, a high speed counter drive gear 45 connected to a side gear 34 of a center differential device 30, a counter shaft 42 having a large diameter gear 43 normally meshed with the low speed drive gear 41 and a small diameter gear 44 meshed with the higher speed drive gear 45, and the second output shaft 50 including an output gear 51 having the same number of tooth as the high speed drive gear 45, normally meshed with the small diameter gear 44. With such an arrangement, the higher speed counter drive gear and the small diameter gear on the counter shaft are to serve as a high speed change means and a power transmission means to the second output shaft. Accordingly, component parts of the power divider can be reduced thereby lessening the size.

Polymer gear pump - with gear chamber and sealed zone shaped for optimum efficiency

Abstract: A gear pump for the transport of highly viscous materials includes two meshing gear wheels in a casing in which adequate free space is left for the material. A sealed zone near the outlet has a minimum length on both sides of the distance between adjacent teeth across the full axial width. The outlet itself has a cross-sectional area of 0.2 to 2-times the product of gear wheel width and tooth height. In plants for the production of polymers and volatile components, such as low-density polyethylene and ethylene also in mixing and compound installations. The free space around the gear wheels results in an interaction of the pumped material which is caused by the revolving gear wheels and the pump casing above the sealed zone and produces a pressure above the pump intake pressure. The shear surfaces and the power losses caused by shear are on eorder of magnitude lower than with conventional positive displacement pumps. A gear pump is less costly and causes less temp. rise than a screw extruder.

Pressure loaded gear pump

Abstract: Disclosed is a pressure loaded gear pump wherein two assemblies each consisting of a pair of abutted bushings are axially slidably fitted into a casing on both sides of a pair of intermeshing impeller gears for supporting rotatably the shafts thereof and for sealing the side faces of the gears; and defined on each side of the casing between the pair of abutted bushings and an end plate are a low pressure chamber into which is admitted the hydraulic pressure in a suction opening, a high pressure chamber into which is admitted the hydraulic pressure in a discharge opening and two moderate pressure chambers each of which is communicated with a sector between the suction opening and the pressure transition or gradient sector of the liquid passage from the suction to discharge openings. The effective area of each moderate pressure chamber is equal to or slightly greater than the cross sectional area of the space between the teeth of the gears. Under the pressures acting on the bushings in the high, moderate and low pressure chambers, the bushings are optimumly pressed against the side faces of the impeller gears independently of the rotational speed and the temperature of liquid being handled, whereby the very effective sealing may be attained and not only the generation of operational noise but also wear of rubbing surfaces of the bushings and gears may be minimized.

Internal gear pump for engine lubrication - has auxiliary suction intake past deepest tooth engagement point to produce vacuum

Abstract: The internal-gear pump is particularly intended for a motor vehicle engine. It takes in oil from a suction line (7) into a suction chamber (9). A suction connection (5) is provided for a vacuum line in the region of the addendum circle of the pinion (3) past the area (8) where the dedendum circle of the gear ring (2) is nearest to the addendum circle of the pinion. The line (5) may connect into a suction chamber (10) adjacent to the inside of the pinion addendum circle.

Test rig for running-in hydraulic gear pumps - has torque, pressure and flow controlled within preset range of values

Abstract: A test rig for running-in hydraulic gear pumps consists of an electric motor which drives the gear pump with a torque meter mounted on the driving shaft. The outpout from the pump passes through a filter and electro-magnetic flow control valve which is controlled by an electronic circuit. The fluid then flows through a hydraulic motor which drives a tachometer which indicates the output quantity. Signals indicating the values of torque, pressure, and flow are generated by the circuits and transmitted to the control circuit and also displayed in the digital display units.