Showing papers on "Gear pump published in 1988"

Variable speed gearing in rotary electric tool

Abstract: A variable speed gearing apparatus for a rotary electric tool, including a differential gear mechanism for being mounted within a gear case, an intermediate gear and a clutch mechanism, a final planetary gear mechanism having internal gear with projections formed on the outer peripheral surface of the internal gear in the differential gear mechanism, a torque-setting cam arranged so that said projections of the internal gear of the final planetary gear mechanism are capable of being engaged with and disengaged from the torque-setting cam a first planetary gear mechanism having an internal gas, wherein the outer peripheral surface of the internal gear of the first planetary gear mechanism in the differential gear mechanism is tapered, a brake disk having a tapered surface corresponding to the tapered surface of the internal gear of the first planetary gear mechanism, the brake disk being arranged to be axially movable to be brought into pressure contact through the tapered surface of the brake disk with the tapered surface of the internal gear of the first planetary gear mechanism movably in a rotation-stopped condition, the brake disk being arranged so that it can be interlocked against axial movement with respect to the internal gear of the final planetary gear mechanism.

Hydraulic system for use with snow-ice removal vehicles

Abstract: A hydraulic system is provided including a hydraulic pump which is continuously coupled with the engine of a utility such as a dump truck utilized for snow-ice removal. When hydraulic implements employed on the truck are not actuated, the pump operates in a cavitation mode. During this cavitation mode of operation, there is no ingress of air through seals or the like to a venting of the gear pump chamber essentially to tank or atmosphere. A poppet valve is actuated in conjunction with periodic use of hydraulic elements on the truck to actuate the pump to an operational or pressurized mode. A key actuated calibrating system is employed to calibrate snow-ice removal components in a secure manner. Calibration is provided in conjunction with EEPROM memory.

Machine for press-molding thermoplastic resin

Abstract: A plasticized resin is extruded from an extruding machine into an accumulator into which the resin is stored by an amount exceeding the amount required for one resin molding operation. The stored resin, in operation, is fed through a flexible hose towards a gear pump under controlled pressure conditions. The resin is measured by the gear pump and the displacement and the rotational speed of the gear pump are controlled by a suitable controller such as microcomputer to exactly measure the plasticized resin to be charged into the mold cavity in a predetermined distributing mode. The clamping of the mold can be effected by a clamping force less than that required by a conventional press-molding machine.

Method and apparatus for applying multicomponent materials

Abstract: A method and apparatus for metering and pumping multicomponents of high and low viscosity materials and subsequently mixing and applying the mixture includes gear pumps for pumping each component Each gear pump has gears operating in a gear housing for receiving and pumping one of the components The gear pumps are simultaneously driven at a predetermined speed and each gear pump is designed to pump a predetermined amount of its respective components, at the predetermined speed Flexible hoses connect the pumps to an applicator Check valves are used to maintain the pressure in these hoses when the pumps are in their at-rest position The gear pumps may be driven at the same rotational speed but are designed to pump a predetermined amount of the different materials so that the ratio of materials can be precisely set

Hydrostatic-mechanical power-shift transmission with a continuous effect

Abstract: The transmission consists of a multi-shaft planetary gear mechanism, a continuously variable hydrostatic transmission, rear-mounted gear stages and clutches. The hydrostatic transmission includes a positive displacement machine with a variable displacement volume and a positive displacement machine with a constant displacement volume. In the planetary gear mechanism, one shaft forms the input shaft and the variable positive displacement machine is connected to this. A second shaft of the planetary gear mechanism is connected to the constant-volume positive displacement machine. A third and fourth shaft of the planetary gear mechanism represent coupling shafts. In an extreme position of the hydrostatic transmission, these rotate at the same speed and, when the hydrostatic transmission is adjusted to the other extreme position, there is a continuous increase in the speed of rotation of one of the coupling shafts and a continuous decrease in the speed of rotation of the other, and these coupling shafts act alternately, in each case via at least two rear-mounted stages, also known as gears, on the output shaft. In the extreme positions of the hydrostatic transmission, gear changes are performed at synchronous speeds, in a load-free manner and without interruption to the tractive effort, by selector clutches. Control and regulation of the automatic transmission is performed by electronic and hydraulic means.

Electric actuator for swashplate

Abstract: An actuating mechanism for controlling the swashplate angle in a Stirling cycle engine or other engine having parallel reciprocating pistons. The actuation system uses an electric motor for changing swashplate angle. Various embodiments for gear trains for communicating rotation of the electric motor rotor to the swashplate are described. In a first embodiment, a planet gear carrier is driven by the motor and the planet gears simultaneously mesh with two ring gears having a differing number of teeth. Rotation of the carrier creates a high reduction drive for the second ring gear. In accordance with a second embodiment, the ring gear carrier is permitted to freely rotate and a driving sun gear is provided which meshes with the planet gears. In accordance with a third embodiment, the planet gear carrier is driven and the planet gears have two different diameter scrtions which mesh with the two ring gears, thus avoiding the high friction associated with a mismatching of the teeth of the planet gear and ring gears of the first and second embodiments. The fourth embodiment combines the features of the second and third embodiment configurations.

Variable discharge gear pump with energy recovery

Abstract: Variable discharge and energy recovery is produced by an adjustable spool (30) in fluid communication with the outlet chamber (28) for adjustably providing pressurized fluid from the outlet chamber (28) to selected portions of the demeshing area of the intermeshing teeth to vary the discharge flow of the pump and the amount of energy recovery. This results in maintaining a positive pressure in selected portions of the demeshing area as well as equalizing the pressure in the selected areas to the pressure in the outlet chamber (28). The adjustable spool (30) also controls the connection between the inlet chamber (26) and the demeshing area to vary the energy recovery.

Manually operated gear pump spray head

Abstract: A spray head containing a gear pump for drawing liquid from a container and forcing same out of a nozzle. The gear pump comprises a pair of operatively engaged gears each rotatable about horizontal axes transverse to the axis of the nozzle. A ratchet wheel is axially secured to one of the gears and the ratchet and its gear are intermittently rotated about their common axis by a pawl member which is attached to a manually operable trigger which moves in a plane within the plane of the gears.

Pumped coating product spraying installation

Abstract: An installation for spraying a coating product in liquid form, as in the automobile industry, comprises at least one circuit and, in that circuit, a pump, at least one sprayer, and a flexible conduit connecting an outlet of the pump to the sprayer. The flowrate of liquid in the conduit is controlled by a servo-system which controls the pump. The pump is preferably a gear pump.

Dual hydrostatic drive transmission

Abstract: A hydrostatic transmission includes a mechanically driven hydraulic pump connected in hydraulic circuit with first and second hydraulic motors. The hydrostatic outputs of the first and second motors are respectively applied to the ring and sun gears of a planetary gear set whose carrier constitutes the transmission hydrostatic output. Acceleration under low speed, high torque conditions is achieved by varying the displacements of the pump and second motor, while the first motor is removed from the hydraulic circuit and the ring gear is braked. At an appropriate shift point, the first motor is inserted into the hydraulic circuit and the ring gear is released, such that further acceleration is achieved by varying the displacements of the pump and both motors in coordination.

Electrohydraulic/air bike

Abstract: A bicycle or motocycle that can be driven either by compressed air or pressurized hydraulics in which either an electric motor operated from a battery source drives a pump or the rider manually provides pedal power for driving the pump in compressing either air or pressurizing hydraulic fluid that is fed through pipelines to a cylinder motor having a piston and rod mechanically connected to a series of clutches that are connected to a series of rectangular or square gears operatively arranged for rotating a series of worm screw gears to the reciprocation of the piston rod whereby the screw gears are connected to an output shaft having a gear operably connected to a second gear that is fixed to the drive axle of the two wheel vehicle for its rotation thereof. Additionally, the arrangement is for the storing of excess pressurized working fluid in a pressure accumulator as auxilliary power for driving the vehicle and for the recovery of kinetic energy during braking and deceleration by the application of regenerative braking to the electric motor and a flywheel is arranged to a pump and operably connected to an alternator for generating electricity from stored potential energy. Pressurized hydraulic fluid or compressed air is fed from storage or a pump for operating the braking system.

Drive for a double-worm extruder

Abstract: Two worms of a worm extruder are connected to drive shafts of different lengths journaled in a transmission housing. For driving one of the worms, a first gear is keyed to the longer drive shaft and is driven by the motor gear and the electric motor. The second worm is driven by a further shaft, one end of which has a gear meshing with the second gear keyed to the short drive shaft so that the gear of this further shaft and the gears of the two drive shafts lie in a common plane. The further shaft is driven by a gear meshing with the motor shaft or by a separate motor. With this apparatus torque distribution is improved and the number of gears and components of the transmission is reduced.

Hydraulic system for an industrial machine

Abstract: An excavator has a number of different hydraulically powered functions that are controlled by a closed center hydraulic system that features a pair of variable displacement, engine driving hydraulic pumps, the displacement of which is responsive to the demands of the system. The flow to the various hydraulic motors is controlled by pilot operated load sensing control valves that direct fluid pressure to a load sensing line when one of the hydraulic motors in the system is being operated. The load sensing line is connected to the control system of the pumps to place the pumps in stroke when a flow of pressurized fluid is required. The flow of the load sensing pressure to the controls for one of the pumps can be optionally disconnected to place said pump in a standby condition and thereby reduce the flow capacity of the hydraulic system at the option of the operator.

Lubricating oil pump

Abstract: Known lubricating oil pumps in motor vehicles are designed to take the form of gear pumps in such a way that their function is limited to generating a pressurised stream of lubricating oil. This makes it necessary to integrate the functional elements for further functions, especially for gradually reducing the superatmospheric pressure and providing additional oil for special requirements, in the motor as additional assemblies. The innovative lubricating oil pump has a valve arrangement for the outflow and an inlet control system and outlet control system. The pump case is enclosed by a polygon on which the channels and the control devices are arranged. The individual functional elements, in particular the inlet valve device (39), the outlet valves (54), the load indicating channel (44) and the filter are distributed across the sides of the polygon.

Rotary vibration damper

Abstract: There is provided a device for use with a rotary vibration damper, particularly in a piston engine, which varies the flow volume rate of a liquid damping medium. Spur gears are supported in a planetary gear type system in the cylindrical casing of the damper, the spur gears being connected to one of the engine drive shaft or the damper output shaft. The spur gears form a gear pump for a closed circuit of the damping medium and mesh with a central spur gear mounted on the other one of the engine drive or the damper output shaft. A reservoir chamber for the damping medium is provided in the conveying conduit on the pressure side having an elastically variable volume. A piston valve is provided in the conveying conduit on the pressure side which is controlled as a function of the engine speed or revolutions wherein the piston, by its axial position, is adapted to vary the cross section of the conveying conduit and thereby serve as a throttle member.

Marine transmission with fluid coupler

Abstract: A fluid coupling is provided in a marine drive between the engine and the propulsion unit. The fluid coupling includes a fluid pump connected to the flywheel of the engine, and a turbine connected to an output shaft leading to the propulsiion unit. A series of vanes are provided between the fluid pump and the turbine, to direct the flow of fluid from the fluid pump to the turbine. The vanes between the pump and the turbine are movable to control the direction of impingement of fluid on the turbine, to regulate the speed and/or direction of rotation of the turbine relative to the speed and direction of rotation of the fluid pump.

Hydraulic mechanical power drive for heavy vehicles

Abstract: A hydraulic-mechanical transmission for a heavy vehicle as shown in FIG. 5 includes a hydraulic variable-displacement pump (I) supplying fluid under pressure to two hydraulic, variable-displacement motors (II, III), controlled by valves (64, 65). It further includes a planetary gear (IV) enclosed in a casing (1) which can be driven by one of the motors (II) through a pinion (51) and an external ring gear (10). The second motor (III) can drive the casing (1) which latter is mounted direct on the motor shaft (40). A planet carrier (2) can be coupled to the casing (1) by a clutch (33) or is freely movable in the casing. A sun gear (31) is mounted on an output shaft (3), while the planet gears (20) engage with an internal gear (11) of the casing. Three speeds and torques are available by respectively driving the planetary gear by either motor or by both motors together and by alternately coupling the planet carrier to the casing or having it freely rotating by operation of the clutch.

Variable displacement rotary fluid machine

Abstract: An internally meshing gear-pump, or motor comprises inlet and outlet ports 27,28 for the working fluid through a sealing plate 5 mounted on the shaft 1, an externally-toothed gear 2 is longitudinally displaceable relative to internally-toothed gears 3,4 to vary the pump or motor displacement, a sealing member 6 is secured to the end-face of the gear 2 which separates the displacement chambers 29,30 from the varying volume spaces which may be filled by controlled working fluid formed in both longitudinal and diametrically opposite regions 11,12. When the gear 2 is moved longitudinally from the maximum displacement position to the extreme left to a reduced capacity position and thus varies the output of the pump or motor mounting these machines back-to-back or in other combinations, a continuously variable and or differential transmission of working fluid may be obtained. Additionally electrical windings 85,86 may be mounted in the casings 7,8.

Anti-lash gear mechanism

Abstract: An anti-lash gear mechanism is provided to reduce the noise in a gearing system. The anti-lash mechanism has a gear member disposed for rotation axially adjacent one of the power transmitting gears in a gearing system. The anti-lash gear has one more tooth on the periphery than the power transmitting gear and the anti-lash gear is disposed in frictional engagement with the power transmitting gear. When another power transmitting gear meshes with this combination of gears, the anti-lash gear remains in mesh with the drive gear until the next successive gear tooth on the driven gear is engaged. The frictional contact prevents the drive gear from accelerating to engage the drive gear from the driven side. This gear mesh causes the anti-lash gear to rotate relative to the power transmitting gear until complete meshing of the two power transmitting gears is attained. In one embodiment of the invention, a centrifugal mechanism is provided to reduce the frictional engagement at high gear speeds where anti-lash meshes are not required.

Gear pump with ring-type shaft retainer

Abstract: A gear pump in which a drive shaft is telescoped into a bore in a spur gear and is held against rotation relative to the gear by means of a key fitting into keyways formed in the shaft and in the bore of the gear. To retain the shaft against axial movement relative to the gear, a spring steel ring is formed with a radially extending slot having a transverse width just slightly greater than the transverse width of the key. The ring is collapsed hoopwise into a groove in the shaft and is positioned such that the slot in the ring is alined axially with the keyway in the shaft. When the shaft is telescoped to a predetermined depth in the bore in the gear, the ring expands hoopwise and snaps into a groove formed in the wall of the bore. The coaction of the ring with the two grooves locks the shaft against axial movement relative to the gear.

Delivery flow reaction absorbing pump

Abstract: PURPOSE:To obtain an efficient pump, by employing an internal gear in main section of a pump thereby forming an internal gear pump at the inside thereof and a vane pump at the outside thereof. CONSTITUTION:Main section of a pump is constructed with internal gears 1, 2 so as to form a sub-pump, i.e. an internal gear pump, together with inside suction/discharge ports 5, 6, while a vane 7 is arranged at the outer circumference of an external gear 1 so as to form a main pump, i.e. a vane pump, together with the outside suction/discharge ports 3, 4. Since the delivery flow reaction produced by the vane pump is reduced by the difference of axes of the internal gears 1, 2, necessary input capacity of a complex pump comprising an internal gear pump and the vane pump can be reduced.

Speed limiter with safety brakes, e.g. for lift cars

Abstract: The patent application concerns a speed limiter for safety brakes, for example on lift cars, with which, when the intended downward speed is exceeded, converted to the corresponding rotary speed of a gear pump, for example, a pump rod is extended, triggering a safety brake, for example.

Form collator gluing apparatus

Abstract: A form collator gluing apparatus in which a plurality of rollers each having a pin wheel are arranged in a framework, a sheet of paper guided by a guide roller is hung over the roller and transferred by a main motor, the sheet of paper is opposite a nozzle mounted on an outlet side of a gear pump which is communicated with a glue tub through a hose, and glue discharged from the gear pump is skippingly or linearly applied onto the continuous sheet of paper by a motor drive and an electronic control of a computer, or by swinging the gear pump by a mechanical means such as cam.

End lubrication and sealing in gear pumps with fixed end plates

Abstract: Lubrification et etancheite aux extremites axiales des pompes a engrenages dans le cas de plaques d'extremite fixes

Rotary gear pump or motor for fluids

Abstract: A gear pump or motor comprises a pair of rotary gears which are in external meshing engagement with each other. A thrust plate is pressed against the side faces of the gears by means of a plurality of pressure areas which are produced by means of a sealing and compensating unit. The unit is urged piston-like by virtue of fluid pressure chambers against the back of the thrust plate to engage it against the gears. Depending on the direction of rotation of the gears of the machine the pressure areas define the general configuration of a 3 or a e.

High-speed extrusion with the extruder/gear pump combination

Abstract: With the series connection of an extruder and a pump, the extruder is to be operated as adiabatically as possible with low pressure build-up. Therefore, the extruder screw substantially comprises only one compression zone with a plurality of shear sections (7) and decompression zones (14). The shearing deformation of the shear sections increases towards the end of the screw.

Speed reducing or increasing planetary gear apparatus

Abstract: A planetary gear apparatus includes: an external gear mounted on an input shaft with an eccentric member and a bearing fitted onto the eccentric member therebetween; an internal gear engaging with the external gear, the internal gear being coaxial with respect to the input shaft; an output shaft for outputting a reduced rotational force; and a drive for coupling the external gear and the output shaft. The planetary gear apparatus is adapted to transmit the rotational force of the input shaft to the output shaft after it has reduced the speed thereof, or to transmit the rotational force of the output shaft to the input shaft after it has increased the speed thereof, by fixing the internal gear. The external gear has a ring-like shape. The inner peripheral surface of the external gear is provided with a hole into which the bearing that is fitted on the eccentric member is fitted, and splines are formed on the insertion hole over the entire external gear in such a manner that they are coaxial with respect to the external gear. The bearing having a width shorter than that of the splines is fitted into one end side of the bearing insertion hole, and the drive having an end provided with splines is engaged with the other end side of the bearing insertion hole. The other end of the drive is provided with splines or spline grooves which are engaged with spline grooves or splines provided in the output shaft.

Gear motor with valve controlled pressure biased end-plate seal

Abstract: A gear motor comprises two meshing gears and a pressure plate pressed against respective lateral surfaces of the gears by pressure in two substantially concentric separate pressure areas arranged on a side of the pressure plate remote from the gears. A control valve controls pressure in one of the pressure areas to adjust a contact pressure of the pressure plate on the gear in such a manner as to increase the contact pressure with an increase in working pressure.