Showing papers on "Gear pump published in 1986"

Backlash reducer for gear transmission system

Abstract: A backlash reducer for a gear transmission system comprises a main gear and an auxiliary gear which form one of a driving gear and a driven gear in mesh therewith of the gear transmission system. The main gear is mounted on a rotary shaft for rotation therewith, and the auxiliary gear is mounted on the rotary shaft for rotation relative thereto. A backlash reducing mechanism is operable in response to a centrifugal force due to rotation of the rotary shaft for angularly moving the main and auxiliary gears relative to each other to reduce a backlash between the driving and driven gears. The backlash reducer may further comprise a mechanism for restraining the backlash reducing action of the backlash reducing mechanism. Alternatively, the backlash reducer may comprise a first mechanism operable in response to the centrifugal force to move the auxiliary gear axially thereof and a second mechanism for converting the axial movement of the auxiliary gear to circumferential movement thereof.

Variable capacity gear pump with pressure balance for transverse forces

Abstract: A gear pump in which one rotating, toothed pump gear is supported axially displaceable in the pump casing and engaging an axially displaceable sliding part at least on the one face wall of the pump gear. The sliding part is adapted to overlap the operating space or zone of engagement of the displaceable pump gear against the other, axially stationary pump gear, with hydraulic relief provided by the pump casing and/or the sliding part by pocket-like recesses on the side diametrically opposing the pressure side of the pump across the displaceable pump gear, the recesses hydraulically communicating with the pressure side of the pump.

Two-wheeled vehicle with hydraulic transmission

Abstract: A two-wheeled vehicle such as a bicycle includes a variable displacement fluid pump such as a radial plunger pump provided at a crankshaft of pedals and a fixed displacement fluid motor such as a gear motor at a rear wheel or a front wheel. The fluid pump and motor are connected through hydraulic passages. Plungers of the radial plunger pump are driven by a cam assembly whose eccentricity is adjustable by means of an eccentricity control means dependent upon the load acting upon the vehicle in a stepless manner, so that the speed of the vehicle can be changed in a stepless manner. Moreover, the vehicle includes automatic speed change means which automatically change the eccentricity of the eccentric cam assembly according to hydraulic pressure of the variable displacement fluid pump, so that the speed of the vehicle can be automatically changed.

Paint spray machine having wet film thickness measurement and feedback control

Abstract: An improved paint spraying device for applying coats of paint to an object in which the machine has a paint spray gun, a gear pump gun that pumps paint to the spray gun from a vessel containing paint, a variable speed electric motor that drives the gear pump, a pump motor controller that controls the electric motor of the gear pump, means for moving the spray gun vertically and horizontally and for controlling the speed and acceleration of the movement of the gun, means for controlling the number of passes made by the gun, the dwell period at the end of each pass and the flash time between coats of paint applied by the gun; wherein the improvement is as follows: a. a wet film measuring device which makes a measurement of paint film thickness of the paint applied to the surface of the object without contacting the object at a multiplicity of predetermined points over the entire painted surface of the object and generates an electrical signal for each film thickness measurement that is proportional to the film thickness and correlates the measurement to point at which the measurement was made; b. a computer which receives the signal from the measuring device and calculates increase or decrease in amount of paint to be applied to the next object being sprayed at each point the film thickness was measured and converts to a signal that is fed to the pump motor controller that controls paint being fed to the spray gun.

Power steering gear with two-way check valve

Abstract: This double acting check valve allows hydraulic power steering oil to flow from the power steering pump through the valve to the power steering gear in normal operation. During an impact load at the tire, the piston in the gear forces the oil from the gear to the check valve which controls or meters the oil flow and pressure so that the impact is not transmitted back to the steering wheel. In the event that the impact load is severe and pressures build up within the power steering gear, as a result, the blow off valve opens to allow such back flow to reduce or eliminate damage to the gear housing.

Transmission with a speed reducer and gear shifter

Abstract: A transmission for an electrically powered vehicle includes an output shaft having a central axis and a carrier gear mounted to rotate about that axis. The carrier gear is driven by at least one electric motor and is coupled to the output shaft by an over-running clutch. A plurality of planetary gears are mounted on shafts which are attached to the carrier gear and positioned to engage a sun gear on the output shaft and a ring gear. A housing surrounds the gear assembly and a mechanism is provided to inhibit rotation of the ring gear thereby increasing the speed of the output shaft relative to the speed of the carrier gear.

Hydraulically power assisted steering gear with pressure relief stop

Abstract: Rack and pinion steering gear with hydraulic power assist that is reduced as the vehicle wheels approach their positive wheel stops so that hydraulic loads on the steering gear and linkage are reduced and the power steering pump is not forced to excessive operation in relief.

Gear pump-liquid gas mixer with improved gas introduction

Abstract: A two stage mixing gear pump for dispersing a gas into a liquid wherein a metered quantity of liquid from the first stage of the pump is supplied to gas filled intertooth spaces of the second stage pump The gas is introduced into the intertooth spaces of the second stage of the pump through a gas inlet which is adjacent the low pressure side of the gear teeth meshing zone of the second stage of the pump and the liquid enters the gas containing intertooth spaces downstream of the gas inlet

Adhesive pump and it's control system

Abstract: An improved adhesive pump and pump control system for automatically changing the flow rate of adhesive materials being dispensed onto a workpiece in conformance with changes in movement of a robot controlled adhesive dispensing nozzle used to apply adhesive materials automatically onto the surface of the workpiece in accordance with a predetermined pattern. The system includes an improved adhesive gear pump having a novel sealing arrangement which employs lubricant grease supplied under pressure for preventing leakage of the adhesive along the shaft into the bearings of the pump thereby assuring long and reliable operating life for the pump under normal operating conditions.

Self-contained power take-off

Abstract: A self-contained remotely actuated power take-off assembly for front mounting to an engine. A sump containing hydraulic fluid is contained within the power take-off housing to supply hydraulic fluid by a gerotor pump connected to the output shaft supplying fluid under pressure to a piston and cylinder hydraulic actuator. A friction disk clutch operatively engages a gear train between the input and output shaft when acted upon by the piston. A remotely operated solenoid valve located between the pump and hydraulic cylinder is used for such actuation.

Gear pump or motor with tooth tips of dissimilar metal

Abstract: A gear pump and motor is provided having increased life and efficiency as a result of improved wiping action of the gear teeth on the inner periphery of the pump chamber. This is accomplished by providing a non-smooth surface layer of a dissimilar metal such as a carbide on the tip ends of the teeth.

Electric wheel driving gear

Abstract: PURPOSE: To make a design for a large reduction gear ratio attainable as well as to make maintenance and servicing for devices including an electric motor or the like performable so easily, by setting up a star type secondary final reduction gear and a planetary type primary reduction gear in a body outward of the motor in order. CONSTITUTION: An electric motor 3 is set up in the axle case 2 attached to a car body 1, and an output shaft 9 this motor 3 is connected to a pinion gear shaft 11 of a planetary type primary reduction gear 10. On the other hand, rotation of a pinion gear 11a being formed in this shaft 11 is transmitted to a pinion gear 17 of a star type secondary final reduction gear via each of gears 14 and 15 and a planetary carrier 16. in addition, oil is made to flow into a chamber 26, operating a piston 27, and braking action is secured by friction between disc plates 23a and 23b. Furthermore, cooling air C is passed through the inside of the motor 3, the passage 28 formed in a gearcase 24 and the inside of an idler shaft 29, and discharged (D and E) to the outside the axle case 2. COPYRIGHT: (C)1987,JPO&Japio

Two rotary gear pumps arranged in different plates

Abstract: The invention provides an oil pump as a replacement for the conventional piston type oil pumps used in Triumph motor cycles. The pump of the invention comprises a plurality of plates with a feed pump section between a pair of plates and a scavenge section between another pair of plates. Appropriate bores and galleries are provided between the plates for the pumping of the oil. The pumping sections are formed by rotary lobed pump members.

Flow amplifying steering system

Abstract: A power steering system having a hydraulic motor driven by fluid flow from a hand operated pump and a main pump. The hand pump provides input to a control valve which amplifies fluid flow to the hydraulic motor, with fluid from the main pump, in proportion to the flow rate through the hand pump. The degree of amplification is controlled by ports within the control valve which also serve to communicate hand generated fluid pressure to the hydraulic motor. The hand pump will also allow delivery of hand generated fluid pressure to the hydraulic motor in the event of a main hydraulic pump failure.

Transmission, particularly for cross-country motor vehicles

Abstract: A transmission for a motor vehicle comprises a multispeed change gear set comprising a plurality of loose spur gears and a plurality of fixed spur gears, each of which is permanently in mesh with one of the loose spur gears. The transmission comprises a second gear set, which is adapted to be selectively driven by the change gear set. The change gear set comprises an input shaft and two gear set output shafts. The loose spur gears for relatively low speeds are rotatably mounted on and adapted to be coupled to the first gear set output shaft. The loose spur gears for relatively high speeds are rotatably mounted on and adapted to be coupled to the second gear set output shaft. To simplify the structure and to reduce the overall size of the transmission in the direction of the input and output shafts, an additional spur gear is non-rotatably mounted on each gear set output shaft and is in mesh with a common idler gear, which is adapted to be coupled to a pinion, which is in mesh with a final output gear. The second gear set comprises a large spur gear and a small spur gear, which are adapted to be coupled to each other. The large spur gear is permanently in mesh with the additional spur gear mounted on the second gear set output shaft. The small spur gear is permanently in mesh with the final output gear. The two clutches between the idler gear and the pinion which is coaxial thereto and between the large and small spur gears can be engaged and disengaged only in mutually opposite senses.

Automobile transmission with output shaft parallel to crank shaft and parking gear fixed to the output shaft

Abstract: An improved transverse-mount type driving device for an automobile, having an output gear provided between last and intermediate planetary gear units of an auxiliary speed change gear assembly, the output gear meshing with a driven gear on a transmission shaft which extends parallel with the auxiliary speed change gear assembly and mounts a drive gear at an end proximate of the torque converter for meshing engagement with a differential drive gear which in turn transmits power to right and left axle shafts. A parking gear is provided on the transmission shaft for selective engagement to prevent rotation of the transmission shaft when the automobile is in park.

Correction method for inner rotor curve of internal gear pump meshed in trochoid

Abstract: PURPOSE:To reduce the gap generated during the revolution of an inner rotor of an internal gap pump in trochoid meshing, by preparing the inner rotor by using the radius of the fundamental circle, radius of the rolling circle, and the radius of the drawn circle which are corrected from the theoretical curve for the inner rotor under special conditions. CONSTITUTION:A gap is generated between an inner rotor and an outer rotor by retreating the tip part of the inner rotor whose theoretical curve is given by the radius A0 of fundamental circle, radius B0 of rolling circle, amount (e) of essentially, radius C0 of drawn circle, and the number (n) of teeth n=A0/B0, by the fundamental correction amount DELTAX. Setting the retreat amount at this time as the fundamental correction amount DELTAX, the radius A1 of the fundamental circle after correction, radius B1 of the rolling circle and the radius C1 of the drawn circle are obtained according to the equation I, and the inner rotor curve is corrected. When the inner rotor is prepared by using the correc tion value, the pump efficiency can be improved by reducing the amount of gap which is generated during the revolution of the rotor of an internal gear pump meshed in trochoid.

Drive device for coolant pumps

Abstract: A drive device for coolant pumps having a pump shaft, a boss having a bore in which the pump shaft is rotatably disposed and a driven gear made from synthetic resin to transmit the rotational power from the crankshaft to the impeller to move the coolant into circulation through the coolant jacket for engine cooling, is disclosed which comprises a pin, fixedly implanted in radial pattern in the circumference of the pump shaft, a couple of radially extending grooves outwardly from the center of the driven gear bore in that side of the driven gear facing the impeller to receive therein fittingly the pin, respectively, and a washer mounted about the pump shaft between the front end face of the bore and the pin so as to prevent the pump shaft from falling off from its bore. When the driven gear is driven by the crankshaft, the pin closely fitted in the grooves transmits the torque to the pump shaft, without any slip. This arrangement can eliminates the conventional metal bushing fitted in the driven gear about the pump shaft to insure fit between the pump shaft and driven gear.

Gear pump with improved pinion mounting

Abstract: A two-stage gear pump with two gear sets each having a pinion telescoped onto a slotted drive shaft with a press fit and also positively keyed to the shaft. One key in the slot of the shaft includes radial ears establishing a positive coupling between the shaft and one of the pinions and also includes cantilevered spring fingers which enhance the press fit between the shaft and the other pinion.

Piston pump and drive therefor

Abstract: A device for a drive for pumps with a constant holding and preset operating pressure, has, in order that it can be driven by a commercially available electric motor which can continue running with a closed spray gun, a differential gear with an input shaft (15) for the connection of the motor and two output shafts (8, 30) for connection to the pump and a series connected hydraulic pump and adjustable throttle valve.

Method and apparatus for degassing liquids, polymer melts and solutions

Abstract: The degassing of a fluid, especially polymer melt, is achieved in that the melt provided is extruded as a thin melt film or the like. Through a nozzle in which is under low pressure supply chamber of a gear pump. By level sensors in the region of the feed pockets of the gear pump of the melt level is determined, and the rotational speed of the gear pump or screw press set so that only a small overlap of the gears with melt is present. The movement of the melt in the feeder bags new free surfaces are constantly created and supports the degassing of the melt in an advantageous manner.

Gear pump with means for preventing shaft lock-up

Abstract: The pinion gear of a gear pump is press fit onto the end portion of the drive shaft of the pump and is positively captivated on the shaft by a key and by a hot upsetting process, the latter resulting in the formation of axially protruding burrs on the end face of the shaft. When the drive shaft is rammed forwardly with significant force, the burrs tend to embed in an end plate disposed in opposing relation with the shaft. To prevent the burrs from embedding in the end plate and locking the shaft against rotation, the end plate is formed with a recess which receives the burrs with substantial axial clearance when the shaft is rammed forwardly against the end plate.

Rotary extruder with a gear pump

Abstract: Rotary extruder apparatus is provided comprising housing (22), recess (29) within housing (22), cylindrical rotor (30) rotatably mounted within recess (29) in housing (22), feed inlet (25), discharge outlet (52) providing fluid communication between recess (29) and diehead (26), in combination with gear pump (160) adapted to increase the pressure of material received from discharge outlet (52). Knurled rotor (30), undercut feed inlet (25), segmented rotor shafts (18, 18'), thrust rings (109, 109') made of dissimilar metals, and circumferentially spaced cartridge heaters (63) in housing (22) are also disclosed.

Multistage internal-gear gear pump

Abstract: The present invention is used, in connection with appropriate control and switching units, to save pump drive energy in surplus-delivery operational states and to achieve a more even flow rate or ecologically more favourable distribution of the delivery stream into various supply circuits. It is preferably applied in cases where there is a wide spectrum of operational rotational speeds or in highly variable delivery requirement, such as, for example, in mobile hydraulics. … The object of the present invention is to provide economically and constructionally advantageous multistage pump combinations comprising internal-gear gear pumps (crescent pumps) which are known to have advantageous functional characteristics. … The solution essentially comprises a plurality of internal-gear pump stages being disposed in a plane within a casing in a space-saving manner. One embodiment of the invention, for example, according to the adjacent figure consists in a plurality of internal- and external-gear toothed rings, acting as pump rotors, being disposed in each case eccentrically to one another, within one another or around one another. Advantageous pressure-balancing devices are also claimed.

Differential gear with differential limiting clutch

Abstract: PURPOSE:To enhance the driving maneuverability of a saddle riding type vehicle by operating a differential limiting clutch by the discharge oil pressure of a pump which is driven in response to the relative rotation of two transmission parts so that the differential limiting function is developed when the relative number or revolutions exceed a prescribed value. CONSTITUTION:A differential limiting clutch 15 is arranged between a differential case 10 as a relatively rotatable transmission part on one side and a side gear 12r as a transmission part on the other side. In this differential limiting clutch 15, a thrust piston 18 which is energized by a spring 26 in such direction as a friction engaging condition is released is provided. On the other hand, a gear pump 28 which is driven by the relative rotation of both transmission parts 10 and 12r is provided. And it is so arranged that the gear pump 28 exerts the discharge oil pressure on the thrust piston 18 via a control mechanism when the relative number of revolutions exceeds a prescribed value so as to bring the differential limiting clutch 15 into a friction engaging condition.

Rotary gear pump

Abstract: PURPOSE:To prevent a gear from being worn and seizing, by providing a pressure introduction means for introducing the pressure of working fluid from an operating chamber into pressure grooves formed in both end faces of gears. CONSTITUTION:Working fluid is introduced into an operating chamber 20 in association with the rotation of both gears 1, 14, and a part of the fluid enters into pressure grooves 12a, 12b through pressure introducing passage 13. Pressure chambers 12a, 12b are communicated with each other through a pressure communicating passage 13, and therefore, the pressure thereof are equal to each other. Urging forces which are applied respectively to both gears 1, 14 by the pressure in the pressure grooves 12a, 12b, are also equal to each other, and therefore, both gears 1, 14 are held in a neutral condition while they continuously rotate without being biased toward either a front side plate 4 or a rear side plate 5. Thereby, it is possible to prevent the gears from being worn and seizing.

Rotary piston pump, in particular discharge gear pump

Abstract: A discharge gear pump for discharging a corrosive polymer melt under great mechanical loading is described. The problem lies in the material pairing in the area of the bearing bushes mounted in the side plates of the pump housing and of the drive shaft made of corrosion-proof steel. In order to avoid the mechanical wear on the shaft, co-running armour bushes are arranged between the bearing bushes and the drive shaft. The toothed wheel and the armour bushes arranged on both sides on the drive shaft are made either as one part or from a number of components, and in particular from a sintered material which is corrosion-resistant and after its hardening has an adequate hardness of more than 58 HRC.

Multistage gear pump with inner toothing

Abstract: The pump serves one or more circuits and is provided with a switching mechanism to disconnect individual stages from a high pressure main circuit and to connect such stage to the pump inlet or to a lower pressure circuit. A housing (1) contains pump stages with inner toothing, e.g. a driven pinion (6) with external teeth (7) meshing with internal teeth (8) of a rotary gear ring (9), eccentric w.r.t. the pinion forming one stage with an inlet (11) and outlet (12) separated by a crescent-section filler member (10). The ring has external teeth (13) and meshes with internal teeth (14) of a further rotary gear ring (15) eccentric to it to form a further stage with an inlet (16) and outlet (17) separated by a filler (18). Further stages may be similarly arranged around these two stages or two single-stage units may have gear rings provided with external teeth which mesh to form a third stage.

Gear lubrication pump for an air motor

Abstract: This invention relates to a lubrication system for a gear assembly in a sealed housing coupled to an air motor. The lubrication system includes a screw pump powered by the air motor to move lubricated fluid completely through the critical parts in the sealed housing.