Showing papers on "Gear pump published in 2002"

System for recovering energy in hydraulic circuit

Abstract: A method is provided for recovering energy in a hydraulic circuit. The hydraulic circuit includes a pump having a swashplate and being in fluid communication with a hydraulic actuator via a valve. The method includes sensing an overrunning load condition in the hydraulic circuit, actuating the valve to provide fluid from the hydraulic actuator to the pump under the overrunning load condition, and producing a torque output from the fluid provided to the pump. Also, a method is provided for recovering energy in a hydraulic circuit including a pump and a motor in fluid communication with a hydraulic actuator via a valve. The method includes sensing an overrunning load condition in the hydraulic circuit, actuating the valve to provide fluid from the hydraulic actuator to the motor under the overrunning load condition, and producing a torque output from the fluid provided to the motor.

Micro-fluidic valve with a colloidal particle element

Abstract: The present invention relates to the use colloidal particles to realize photonic and microfluidic devices. In particular embodiments, colloidal particles are used to realize microfluidic a two-way valve, three-way valve, check valve, three-dimensional valve, peristalsis pump, rotary pump, vane pump, and two-lobe gear pump. In certain embodiments, actuation of an active element in the microfluidic structure is accomplished by electrophoresis, the use of an optical trap or “tweezer”, or the application of an electric field or magnetic field. In other embodiments, the application of an electrical field to colloidal particles that are substantially constrained to two dimensional movement is used to realize wave guides, filters and switches for optical signals.

Hydraulic circuit of construction machinery

Abstract: A hydraulic circuit of construction machinery, wherein, when three hydraulic pumps are used, the displacement volumes of first and second hydraulic pumps are controlled based on the discharge pressures P1 and P2 of the first and second hydraulic pumps and a discharge pressure P3' obtained by reducing the discharge pressure P3 of a third hydraulic pump by a pressure reducing valve (14) and the displacement volume of the third hydraulic pump (3) is controlled only by the discharge pressure of the third hydraulic pump (3) so that one of the three hydraulic pumps is not affected by the variation of torque of the other hydraulic pumps, whereby a stable flow can be assured by preventing the pressure oil discharged from the third hydraulic pump (3) from being affected by the variation of the discharged flow from the first and second hydraulic pumps (1) and (2), i.e., by the variation of a torque consumption.

Devices employing colloidal-sized particles

Abstract: The present invention relates to the use colloidal particles to realize photonic and microfluidic devices. In particular embodiments, colloidal particles are used to realize microfluidic a two-way valve, three-way valve, check valve, three-dimensional valve, peristalsis pump, rotary pump, vane pump, and two-lobe gear pump. In certain embodiments, actuation of an active element in the microfluidic structure is accomplished by electrophoresis, the use of an optical trap or “tweezer”, or the application of an electric field or magnetic field. In other embodiments, the application of an electrical field to colloidal particles that are substantially constrained to two dimensional movement is used to realize wave guides, filters and switches for optical signals.

Hot melt adhesive supply system with independent gear pump assemblies

Abstract: A new and improved gear pump assembly, and a new and improved hot melt adhesive dispensing assembly having a plurality of the new and improved gear pump assemblies incorporated therein, wherein each gear pump assembly is mounted upon the dispensing assembly in an entirely independent manner such that each gear pump assembly can be individually removed from the dispensing assembly, and replaced back onto the dispensing assembly, as may be necessary in connection with, for example, repair or maintenance procedures. The independence of each gear pump assembly also effectively prevents damage to or failure of one gear pump assembly from experiencing additional damage as well as from adversely affecting the operation of the other gear pump assemblies. Furthermore, in view of the fact that a driven gear of each gear pump assembly projects radially outwardly through an end face of the gear pump assembly so as to operatively engage a common drive shaft of the applicator assembly, as opposed to having the common drive shaft of the applicator assembly pass through side portions or faces of all of the gear pump assemblies, not only is the aforenoted independent mounting of the plurality of gear pump assemblies upon the dispensing assembly facilitated, but in addition, the need for all external rotary dynamic shaft seals, normally necessarily provided between the common drive shaft and one of the gear members of each gear pump assembly, is eliminated.

Hydraulic control apparatus of vehicle and control method

Abstract: A first hydraulic pump and a second hydraulic pump are respectively mounted to both ends of a rotary shaft in an electric motor, whereby it is possible to drive both of the first hydraulic pump and the second hydraulic pump by one electric motor. Since the electric motor is driven and controlled so as to have any higher rotational speed among a rotational speed of the first hydraulic pump for obtaining an amount of working fluid required in a hydraulic control circuit for a power steering apparatus and a rotational speed of the second hydraulic pump for obtaining an amount of working fluid required in a hydraulic control circuit for a power train by a hydraulic pump drive controlling portion, it is possible to necessarily and sufficiently secure the working fluids respectively required in the power steering hydraulic control circuit and the power train hydraulic control circuit which are independent from each other, by a little electric power consumption.

Gear mechanism with an idler gear, a gear mechanism with a device for eliminating backlash between gears, and a motor driving mechanism

Abstract: A gear mechanism includes a driving gear, a driven gear, and an idler gear which is in mesh with the driving gear and the driven gear, wherein rotation of the driving gear is transferred to the driven gear via the idler gear. The idler gear includes first and second spur gears which are positioned adjacent to each other in an axial direction and are generally centered about a common axis, radial teeth of the first and second spur gears each being the same in shape, pitch and the number of teeth, and the first and second spur gears being biased to rotate in opposite directions. The first and second spur gears are connected so as to be relatively movable in a radial direction normal to the axial direction while maintaining the first and second spur gears in mesh with the driving gear and the driven gear.

Multi-stage internal gear/turbine fuel pump

Abstract: A multi-stage internal gear/turbine fuel pump for a vehicle includes a housing having an inlet and an outlet and a motor disposed in the housing. The multi-stage internal gear/turbine fuel pump also includes a shaft extending axially and disposed in the housing. The multi-stage internal gear/turbine fuel pump further includes a plurality of pumping modules disposed axially along the shaft. One of the pumping modules is a turbine pumping module and another of the pumping modules is a gerotor pumping module for rotation by the motor to pump fuel from the inlet to the outlet.

The Theoretical Flow Ripple of an External Gear Pump

Abstract: In this paper, the theoretical flow ripple of an external gear pump is studied for pumps of similar size using different numbers of teeth on the driving and driven gears. In this work, the flow ripple equation is derived based upon the flow of incompressible fluid across the changing boundaries of a control volume. From this method, it is shown that the instantaneous length of action within the gear mesh determines the instantaneous flow ripple. Using a numerical solution for the instantaneous length of action, different pump designs are compared. In summary, the results of this study show that it may be advantageous to design an external gear pump with a large number of teeth on the driving gear and a fewer number of teeth on the driven gear. This design configuration will tend to reduce both the physical pump size (without reducing the volumetric displacement of the pump) and the amplitude of the flow pulsation, while increasing the natural harmonic frequencies of the machine.Copyright © 2002 by ASME

Automotive automatic transmission

Abstract: An automatic transmission has: a primary transmission mechanism including: an input shaft; a planetary gear set having a sun gear, planetary gears and a ring gear, each being a helical gear, the ring gear and sun gear being respectively connected to the input shaft and to a stationary member via a one-way clutch, and a carrier for the planetary gears is connected to a primary output shaft; and an centrifugal clutch engaged/released the input shaft with/from the primary output shaft in correspondence with a centrifugal force by a weight and a thrust force by the helical gear; and a secondary transmission mechanism connected to the primary output shaft, for controlling a gear-shift into two or more speed-changed conditions. A multiplicity of change-speed gears is obtained by selectively combining the released and engaged states of the centrifugal clutch for each of the speed-changed conditions of the secondary transmission mechanism.

Method for making a moineau pump stator and resulting stator

Abstract: The invention concerns a Moineau type gear pump stator (1), comprising a stator cavity with global axial extension inside an elongated body, characterised in that the stator cavity is defined by a rigid-walled metal tubular element (3) having internally the shape and dimensions of the stator cavity such that, when it is assembled with a rotor, a positive clearance with the rotor is obtained.

Planetary gear, gear motor and series of gear motors

Abstract: A series of gear motors, a gear motor and a planetary gear stage, comprising planetary gears (105) engaging with a sun wheel (116) and internal gearing which is provided in relation to the gear housing (102) . The planetary gears (105) are mounted in a rotatable planetary carrier (101) forming the output transmission, whereby a sealing element 112) is associated thereto on the output side. The planetary gear step is also associated with another sealing element (119) on the input side. On the input side, the gear housing is formed in such a way that an interface is formed for connection to other components, comprising at least one shaft (117) which is connected to the sun wheel (116).

Trochoid gear pump having means for canceling imbalance load

Abstract: A trochoid pump composed of an inner gear and an outer gear is used as a fluid pump such as a fuel pump for an automotive vehicle. An inner imbalance load inherently developing in the pumping chambers is suppressed or canceled by an outer imbalance load generated by pressurizing fluid introduced into blade ditches formed on an outer periphery of the outer gear. Positions of a pressure-introducing port and a pressure-releasing port for the blade ditches are selected so that the outer imbalance load is imposed in a direction opposing the inner imbalance load. An amount of the outer imbalance load is made equal to an amount of the inner imbalance load to eliminate undesirable effects of the inner imbalance load.

Pump insert for vehicle brake system has pumps and drive element connected to motor with hydraulic fluid suction and pressure bores, arrangement sealing insert fluid-tight from unit housing

Abstract: The pump insert has at least two pumps (1,2) and a drive element (11) for the pumps that is connected to a motor with suction and pressure bores for a hydraulic fluid and an arrangement that seals the pump insert fluid-tight with respect to the housing of the hydraulic unit. The insert has a multi-part housing (3-5) in which two hydraulic pumps are arranged. Independent claims are also included for the following: a hydraulic unit for a vehicle brake system.

Multi-stage internal gear fuel pump

Abstract: A multi-stage internal gear fuel pump for a vehicle includes a housing having an inlet and an outlet and a motor disposed in the housing. The multi-stage internal gear fuel pump also includes a shaft extending axially and disposed in the housing for rotation by the motor. The multi-stage internal gear fuel pump further includes a plurality of pumping modules disposed axially along the shaft and each having an internal gear and an external gear cooperating with each other for rotation by the motor to pump fuel from the inlet to the outlet.

Hydraulic drive system

Abstract: A hydraulic drive and fluid control system for a mechanism having at least two fluid actuated cylinder includes a bi-directional motor/gear pump. A monolithic block manifold has intersecting bores formed therein in which valving and control mechanism for the fluid circuit is mounted. The fluid control system includes a variety of elements for providing smooth action of the cylinders at start, stop, and intermediate operations. These include piston-style accumulators, self-actuating fluid flow rate control valves and cushion valves.

Development of a Dilatometer for Measurement of the PVT Properties of a Polymer/CO2 Solution Using a Foaming Extruder and a Gear Pump

Abstract: This paper presents an innovative dilatometer that can measure the pressure-volume-temperature (PVT) properties of polymer/CO 2 solutions in a molten state. The basic rationale of the design is to determine the density (or equivalently, the specific volume) of a polymer/CO 2 solution by separately measuring the mass and volume flow rates of the solution flowing in an extruder at each temperature and pressure. A positive-displacement gear pump mounted on an extruder is used to measure the volume flow rate of the solution. A single-phase polymer/CO 2 solution is formed by injecting a metered amount of CO 2 into a polymer melt and completely dissolving it in the melt using a foam extrusion line. The temperature of solution was precisely controlled and homogenized by using the second extruder in a tandem system and a heat exchanger with a static mixer. The pressure was controlled by the rotational speed of the screw in the second extruder. In order to reduce leakage across the gear pump, the difference between the upstream and downstream pressures was minimized using a variable resistance valve attached downstream of the gear pump. The mass flow rate was measured by directly collecting the extruded polymer melt for a fixed time after degassing CO 2 . A critical set of experiments was carried out to verify the functions of the system using pure polymer melts with known PVT data. Finally, the system was used to measure the specific volume of PS/CO 2 solutions as a function of CO 2 concentration, temperature, and pressure.

Internal gear pump

Abstract: The invention relates to an internal gear pump for conveying fuel in an internal combustion engine, comprising an internally toothed annular gear (11) and an externally toothed pinion gear (3) which cooperates with the annular gear (11) to produce a pump effect. In order to increase the pump capacity at starting speed and to increase the service life of the internal gear pump, the pinion gear (3) is radially movably mounted in an eccentric position with respect to the annular gear (11) on a stump of the bearing (5). A device (17, 18) is provided in order to compensate the radial clearance between the pinion gear (3) and the annular gear (11). The pump is driven by means of a spring-loaded Oldham coupling which adjusts the axial clearance of the inventive pump

Closed-loop phase compensation controller

Abstract: An adaptive closed-loop controller is described that reduces repetitive speed variations of precision rotatable mechanical components, such as rollers, casting wheels, pulleys, gears, pull rollers, extruders, gear pumps, and the like. A system is illustrated in which the controller is coupled to a motor for driving a rotatable mechanical component in response to a motor control signal. A sensor is mounted to the shaft of the mechanical component, and generates a speed signal representing angular velocity of a mechanical component. The controller receives the speed signal, and generates a set of data elements to relate speed variations of the mechanical component to a plurality of angular positions of the mechanical component over one or more revolutions. The controller generates an error signal based on the data elements and introduces the error signal into closed-loop control circuitry to provide adaptive control over the mechanical component.

Micro gear system operating according to the voltage ripple principle with hollow shafts

Abstract: Disclosed is a flat gear system (10), particularly a micro gear system, operating particularly according to the principle of a voltage ripple gear system, a Wolfrom gear system, or a similar planetary gear system. The gear system comprises at least one sun wheel (14) and at least two planet wheels (16) meshing with the sun wheel (14). The sun wheel (14) is rotatably fixed to a drive shaft (20) placed along a longitudinal axis (18) of the gear system. The planet wheels (16) indirectly or directly mesh with a toothing which is rotatably fixed to a drive shaft (28) placed centrally along the longitudinal axis of the gear system. The drive shafts (20, 28) are embodied as hollow shafts (30, 32) having continuous bore holes (34, 36) such that information or fluid media can be directed through the gear system.

Rotation transmitting device and hydraulic drive device

Abstract: A hydraulic drive device, comprising a hydraulic motor ( 10 ), a rotating body ( 20 ) connected to the drive shaft ( 11 ) of the hydraulic motor( 10 ), functioning, by itself as a flywheel, and having an internal gear ( 21 ) formed on the output side thereof, a rotation transmitting device ( 1 ) having a gear mechanism for transmitting the rotating force of the rotating body ( 20 ) to an output shaft gear ( 50 ) by allowing counter gears ( 30 ) to mesh with the internal gear ( 21 ) and the outer shaft gear ( 50 ) to mesh with the counter gears ( 30 ), and an output shaft connected to the output shaft gear ( 50 ). whereby, since a variation in rotating speed of the hydraulic motor ( 10 ) can be absorbed by the rotation transmitting device ( 1 ), the hydraulic motor( 10 ) can be used directly as the drive source of a vehicle such as a car and a truck.

Oil pump and gears

Abstract: An oil pump for an internal combustion engine includes a pump body with a first gear chamber and a second gear chamber, and a cover mounting to the pump body. The pump also has a check valve and a pressure relief valve in fluid communication with the gear chambers. The oil pump has a supply set of intermeshing involute spur gears in the first gear chamber with nine involute teeth. A return set of intermeshing involute spur gears with the same gear profile as the supply gears is housed in the second gear chamber. Both sets of gears are driven by a common drive shaft so that the pump may be retrofitted to existing engines. The profile of the gears provides for improved pump volume without increasing angular velocity or gear diameter over gears of the prior art. The return gears are deeper than the supply gears to provide an improved supply to return flow ratio.

Rotary variable expansible chamber - kinetic hybrid pump

Abstract: This invention concerns pumping fluids to both high pressures and high flow rates and thus has a very high power density The technology pertains to both fluid power and to fluid transfer and is adaptable to a wide scope of use The concept is a very simple rotary variable displacement expansible chamber pump which can also be a rotary kinetic pump and thus is a hybrid At a positive displacement setting, the pump primes by positive displacement, then as the rotational speed increases; the pump gains a kinetic pumping component, then as head pressure increases the pump again becomes positive displacement At a zero displacement setting, the pump is purely a rotary kinetic pump The variable displacement feature allows both performance and efficiency The porting allows very high rotational speeds and flow rates near to centrifugal designs When set at zero displacement, the device has features both of positive displacement fan (gear pump) and kinetic (centrifugal pump) The pump is vibration free and silent Fields of use are fluid power, where the power density is higher, and fluid transfer where high flow rates at higher pressures are required The concept marries rotary positive displacement to rotary kinetic in pumps

Internal gear type rotary pump

Abstract: PROBLEM TO BE SOLVED: To improve discharge efficiency and a service life and reduce noise and tooth surface wear by dissolving nonuniformity of inter-tooth clearances of an internal gear type pump. SOLUTION: In this internal gear type pump, the space 3 of an outer gear 1 and the addendum 6 of an opposed inner gear 2 have an epicycloidal shape, and the addendum 4 of the outer gear 1 and the space 5 of the opposed inner gear 2 have a hypocycloidal shape. In this constitution, the cycloid is formed by four generating circles rolling on the pitch circle of each gear. An inter-tooth clearance C1 in the deepest mesh position of the outer gear 1 and inner gear 2 and an inter-tooth clearance C2 in the shallowest mesh region of the outer gear and inner gear are almost equal.

System and method for delivering reactive fluids to remote application sites

Abstract: Reactive fluids that react upon contact and are intended to be combined only at a site of application that is remote or not easily accessible are transported to the site by separate crescent internal gear pumps whose pump rates are governed by a control loop that uses individual mass flow rates and a common automatic controller. In preferred embodiments, a multi-lumen cable is used to convey the pump outputs individually to the application site, and an application head at the distal end of the cable both combines the individual flows and dispenses them to the site. The invention is useful for a variety of reactive systems and applications, but particularly for applying two-component epoxy linings to underground pipes.

Multi-passage conduit

Abstract: A well production apparatus includes a down-hole gear pump and a transport assembly to which the gear pump is attached. The transport assembly is formed from a string of modular pipe assemblies having one or more passages for carrying production fluid from the bottom of the well to the surface. The passages can be arranged in a side-by-side configuration, and include pressure and return lines such as used to drive a hydraulic motor connected to the gear pump. The modular pipe assemblies can have two, three, four, or more passages, and can be stepped relative to each other to give a unique assembly orientation. The modular assemblies have mating fitting that can be tightened without the need to spin the pipe joints at the same time.

Transmission ratio change unit having permanent stepped meshing gears

Abstract: The transmission ratio change unit having permanent stepped meshing and perpetual power transmission having the changeable variable speed gear in an unstable operation mode characterised by, having an element, preferably with the taper outline, wherein on the outer surface of the element there is the spiral outline of the gear ring (1) placed on the intermediate motion shaft (2) rotating along the circumference of the clutch shaft (3) and it has the gear-box shaft (4) with sliding gear wheel (5) which is meshed with the gear ring (1) having the spiral outline and the lower gear-box shaft (6) has the sliding gear wheel (7) meshed with gear ring (1) having the spiral outline wherein gear wheel (5) slides towards the gear wheel (7) and the gear wheel (7) slides towards the gear wheel (5). The transmission ratio change unit having permanent stepped meshing and perpetual power transmission having a clutch integrated with the multistage mechanical transmission unit with permanent meshing in the stable operation mode, wherein the mechanical gear has two parallel shafts; the driving shaft and the driven shaft, where the driven shaft or the driving shaft forms the monolithic unity with the gears having different number of teeth and is independently mounted on bearings in the gearbox housing and is permanently meshed with the driving gears or the driven gears, characterised by having slidingly displaced clutch (7) placed inside or outside the driven gears (4) where the clutch is displaced along the driven multispline shaft (8) transferring the turning moment via the frictional surfaces (5, 6) which are perpendicular to the longitudinal axis of the shafts (1, 2) of the gear box and inside or outside driving wheels (14) there is placed sliding clutch (17) moving along the driving multispline shaft (18) transferring the turning momemt via the frictional surfaces (15, 16) pependicular to the longitudinal axis of the shafts (11, 12) of the gear box. The transmission ratio change unit having permanent stepped meshing and perpetual power transmission having the clutch with the frictional working surface (5, 6, 15, 16) transferring the turning moment and forming a side surface with any outline preferably with the cylindrical outline.

Oil pressure supply device for hybrid vehicle

Abstract: PROBLEM TO BE SOLVED: To provide an oil pressure supply device for a hybrid vehicle capable of feeding predetermined hydraulic fluid under pressure even in backward running which becomes a problem when a mechanical hydraulic pump is arranged on an output shaft side of a clutch. SOLUTION: The first hydraulic pump 21 of mechanical driving type is connected to a driving wheel side of the clutch 3 and is always driven when the vehicle runs even if it is driven by a motor. Backward running of the vehicle is realized by releasing the clutch 3 and rotating a motor generator 4 for running reversely. A reverse rotation prevention mechanism 20 using a planetary gear mechanism and a one-way clutch is provided between the motor generator 4 for running and the first hydraulic pump 21. For this reason, even if the motor generator 4 for running rotates reversely when the vehicle runs backward, a rotor of the first hydraulic pump 21 is driven in the same predetermined direction of rotation as the direction in advance running. Since a second electric hydraulic pump 22 shares oil pressure supply only when the vehicle stops, it can be miniaturized. COPYRIGHT: (C)2004,JPO