Showing papers on "Gear pump published in 1992"

Hydraulic pump driven by an electric motor

Abstract: The invention is a hydraulic pump driven by an electric motor which is distinguished by a compact and easily assembled structure. The control apparatus, the electric motor, the hydraulic pump section, the tank, the filter, and the resonator are accommodated within one housing. The hydraulic pump of the present invention includes a modular type of structure, special types of motors, such as a motor without commutator or a "dipped" motor, and is well suited for use in compact spaces in hydraulic systems of automotive vehicles.

Control apparatus for a rotary body for cooling an engine

Abstract: A speed control system for an engine cooling fan has a planetary gearset, variably establishing a ratio between input and output speeds, and a hydraulic controller for changing the speed ratio according to engine operating conditions. Either one of a sun gear and pinion gear constitutes an input gear connected to an engine output of the engine. The other one of the sun gear and pinion gear is operationally coupled to a hydraulic control and a ring gear constitutes an output gear driving a rotary body. The hydraulic controller applies and varies an operational resistance to the planetary gearset according to engine operating conditions so as to cause it to vary the ratio of input and output speeds.

Compact precision extrusion system

Abstract: A compact and precision extrusion system for extruding strips of rubber compounds with profiles of accurate dimensions. Strips of rubber compound are uniformly heated and mixed in an extruder and then passed through a low pressure drop strainer to remove foreign matter. The strained compound then is fed directly into a gear pump which delivers precise volumes of the rubber compound immediately into the spread chamber of an extrusion head after which it passes through a die to form a precise strip of the rubber compound. The strainer and extrusion head are movably mounted with respect to the gear pump for axial separation from the gear pump for easy removal of the rubber compound from the various components of the system to facilitate compound changes. A control system regulates the speed of the extruder to provide a near constant pressure at the entrance port of the gear pump to precisely regulate the rate of extrusion of the compound from the extrusion head. The extruder preferably includes a feed section, a pressure generation section, and a mix section which maintain the temperature of the rubber compound below 100° C.

Hydraulic construction machine

Abstract: PURPOSE:To constitute multifunctional and high performance construction machine inexpensively by controlling a hydraulic pump in accordance with a first mode consisting of low engine speed and high pump input torque and a second mode consisting of high engine speed and low pump input torque. CONSTITUTION:Engine speed of an engine 27 driving a variable displacement type hydraulic pump 1 is controlled as a governor lever 27b of a governor 27a is turned by a pulse motor 28. Discharge oil of the hydraulic pump 1 is respectively introduced to each of hydraulic cylinders 4, 21 for travelling and working through each of control valves 2, 20 for travelling and working. In the meantime, a tilt angle, that is, displacement volume of the hydraulic pump 1 is controlled by a regulator, for example, by a tilt angle control device 40. In this case, by a controller 50, the hydraulic pump 1 is controlled in accordance with a first mode consisting of low engine speed and high pump input torque and a second mode consisting of high engine speed and low pump input torque which are selected by a mode selection switch 58.

Offset face gear transmission

Abstract: A gear arrangement for an offset transmission includes two concentric, counter-rotating face gears in meshing engagement with an engine output shaft, the face gears being connected to respective concentric, vertical counter rotating face gear shafts of unequal length, each shaft ending in a helical spur gear that is in meshing engagement with an output helical face gear. The helical output face gear is connected to the output shaft, thereby completing the offset transmission. The face gear shafts can be coupled together by means of thrust bearings that couple the axial thrusts of one shaft to the other in an opposite direction. The shafts can also be coupled via a preload spring that ensures the torque split between the pinion gears is statically determinant. The gear arrangement can be applied to twin engine designs, with a spur gear train coupling the two engines together via an interconnect shaft.

Power transmission structure of a working car

Abstract: A power transmission structure for a working car provided at the center thereof with a working machine, such as a mower. Power is transmitted by the simplest mechanism from a vertical engine to axles and the working machine. Two output pulleys are attached to a vertical rotary output shaft of the vertical engine. One pulley drives a pump shaft of an axle driving unit and the other pulley drives an input pulley of the working machine. A hydraulic power transmission and a differential gear are laterally eccentrically disposed within the axle driving unit. The hydraulic transmission comprises a hydraulic pump and a hydraulic motor. Power is transmitted from the rotary output shaft of the vertical engine to a vertical pump shaft of the hydraulic pump. A motor shaft of the hydraulic motor is operatively connected to the differential gear.

Gear-type machine with flattened cycloidal tooth shapes

Abstract: In a gear-type machine, in particular in a ring gear pump with internally toothed ring gear meshing with a pinion having only one tooth less, for reducing the noise the pinion teeth are only half as wide as the internally toothed ring gear teeth and the cycloids are flattened in order to ensure adequate free passage of the teeth heads opposite the point of deepest teeth engagement in spite of minimum clearance.

Gear metering pump for compounded elastomeric material

Abstract: OF THE DISCLOSURE A gear metering pump for delivering precise amounts of a compounded elastomeric material into a die. The gear pump has a housing formed with a hollow interior chamber containing a pair of rotating meshing gears mounted on shafts, one of which is power driven, for passing controlled quantities of the compounded material out of the chamber and into the die. A side plate is removably mounted on the housing and encloses an open side of the chamber and is moved between open and closed positions by fluid pressure cylinders mounted on the housing to provide ready access into the chamber for cleanout. A first bearing assembly for the gear shafts is mounted on the removable side plate and retains the gears mounted thereon for removing the gears from within the chamber along with the side plate. Outlet openings are formed in the removable side plate and in an opposite fixed side plate adjacent the shafts and bearings, permitting small quantities of the compounded material to flow between the shafts and bearings and out of the openings for lubrication of the bearings. The drive shaft passes out of the housing through an enlarged opening and is free of any end seal with the housing to reduce heat buildup.

Gear ring pump for internal-combustion engines and automatic transmissions

Abstract: The invention proposes in gear ring pumps for reciprocating internal-combustion engines and/or automatic transmissions allowing the hollow gear to run in the hollow gear housing with a play which is large enough for the pronounced fluctuations of the radial position of the crankshaft or input shaft carrying the pinion of the gear ring pump to be taken up thereby and selecting a toothing for the pump such that the effective mounting of the hollow gear on the pinion is achieved. If a correspondingly largeplay is provided between the shaft and the pinion, the hollow gear is mounted with minimum play in the housing. The pinion is then mounted in the hollow gear.

Internal gear pump

Abstract: An internal gear pump is disclosed having at least two essentially identical internal gears and a pinion meshing with the internal gears, all being rotatably disposed in a housing, the axial dimension of which is substantially equal to the width of the gear and pinion teeth. The housing includes a suction connection and a pressure connection. The internal gears have radial through-bores for the medium to be pumped. A support is provided at the contacting surfaces of the internal gears near the pressure connection.

Electric-motor-driven hydraulic pump

Abstract: The invention relates to a hydraulic pump (4) driven by an electric motor and distinguished by a compact and easily assembled design. The control device (3), electric motor (2), hydraulic pump section (4), tank (6), filter (5) and resonator (7) are fitted in a casing (1). Further embodiments of the invention involve modular construction, special types of motor -- e.g. collector-less or 'immersed' motors -- and the use of the hydraulic pump in motor vehicle hydraulic installations.

Dosing pump for blending two liquids

Abstract: A dosing system for precisely mixing two liquids in a predetermined volumetric relationship includes a flow meter having a fluid inlet, a fluid outlet, and two intermeshed counter-rotating gears positioned between the inlet and outlet. When a first fluid is directed from the inlet to the outlet, the first fluid causes the gears to turn, and the gears turn a predetermined amount for each unit of first fluid directed through the f low meter. The rotor of a peristaltic pump is coupled to one of the gears of the flow meter, such that for each increment of rotation of the gear, the rotor turns to pump a predetermined amount of a second fluid through the peristaltic pump. The outlets of the two pumps are in fluid communication, to permit mixing of the predetermined amounts of first and second fluid.

Gear tooth pump with variable volumetric flow - has additional gears which are disconnected from driving shaft as pressure rises

Abstract: A gear tooth pump has three pairs of meshing gears (3,4)(5,6)(7,8) which are mounted side by side in a housing (1). The gear (3) is formed integrally with the driving shaft (9). The driving shaft has an axial bore which receives a piston (6). This piston has splines on its outside surface which can engage splines in the bores of the gears (3,5,7). A compression spring (24) acts on the piston so that its driven into the bore of the gears (5) and (7) so that they are driven with the gear (3). The bore of the gear (7) is connected by a passageway (22) to the pump outlet so that pump delivery pressure acts on the piston and disengages it from the gears (5) and (7) and so reducing the pump flow. USE/ADVANTAGE - Gear tooth pump for lubricating oil for an engine. The volumetric flow is reduced as pressure rises.

Apparatus for mixing and processing plastic material including a delivery pump

Abstract: A mixing and processing apparatus for plastic melt is equipped with a separately drivable gear pump as a delivery unit. In order to avoid material deposits between the mixing and processing apparatus and the delivery pump, the gear pump is directly mounted at the outlet end of the mixing and processing apparatus, such as an extruder, so that the plastic melt is directly fed axially into the suction space of the gear pump. Cleaning operations after shutdown or in the case of change of material are eliminated due to this direct transfer without dead space.

Full meshing gear type variable speed transmission for electric cars

Abstract: Disclosed herein is a full meshing gear type variable speed transmission using interlocked gear pairs of the driving and driven gears to transmit power from the mainshaft to the auxiliary axle housing. The mainshaft can only drive the first driving gear through the spiral springs to drive the rest of the other driving gears indirectly. Each spiral spring of the different gear is normally disengaged, when the rotational speed of the auxiliary axle housing is exceeding a set limit, the spiral spring will be engaged with its gears change shift by the automatic gravity type shifting assembly. Each driven gear will also transmit its own power thru the transmission mechanism. Each transmission mechanism allows the driven gear of the higher shift to rotate faster than the driven gear of the lower shift, thus the interlocked pair of gears will not disengage during shifting.

Gear pump with groover sealing means

Abstract: A gear pump for pumping viscous material has a housing with an inlet and an outlet and a gear chamber between the inlet and the outlet. A pair of intermeshing gear wheels which are rotatably supported by bearings in the gear chamber of the housing have end faces in rotative contact with abutting faces of the housing. Spiral grooves in end faces of the gear wheels have a direction to move radially outwardly any material entering between end faces of the gear wheels and abutting faces of the housing to prevent such material from reaching the bearings. An integral drive shaft of one of the gears has a helical groove for preventing material from reaching bearings of the drive shaft. The driven gear has a central circular recess in which a bearing stud projects with bearing needles between the stud and the recess in the gear. In one embodiment, the gear pump is mounted on the discharge end of an extruder and interchangeable sieves are provided between the extruder and the gear pump to filter out any foreign objects.

Apparatus for extrusion of plastic and/or rubber mixtures

Abstract: Apparatus for extruding plastic and/or rubber material has a screw extruder, which plasticizes the material and delivers it to a gear pump which develops sufficient pressure for extrusion of the material through an extrusion head. The apparatus is characterized by the fact that the axes of gears of the gear pump and the axis of the screw of the extruder are parallel to one another. The housing of the gear pump has a side opening into which a cylindrical bushing and the screw of the extruder extend so that the material is delivered by the extruder directly to the gear pump as a non-oriented plasticized mass. The extrusion head may be a transverse extrusion head with an axis parallel to the axes of the gear wheels of the gear pump and the axis of the screw of the extruder. A second like extrusion apparatus including a screw extruder and a gear pump may be connected to an opposite side of the extrusion head.

Rubber-geared pump with shaftless gear

Abstract: A gear pump is described for pumping extremely low volumes of fluid at extremely low rates of flow. The pump includes a housing with a cavity therein and a pair of gears rotatable within said cavity. One of the gears is shafted and the other is shaftless, and the gears are made of resilient material with the diameter of the periphery of the tips of the gear teeth exceeding the diameter of the cavity in which they rotate. The face width of the gears also exceeds the depth of the cavity in which they rotate.

Forward and reverse power shift transmission

Abstract: A forward and reverse power shift transmission (10) with an enclosed gear se (38) and a torque converter housing (44) is adapted to be connected to an engine bell housing (12). An input shaft (46), a lay shaft (146) an output shaft 36 and a pump driveshaft (280) are rotatably journaled in the gear case. A clutch cylinder and gear (78) secured to the input shaft is in mesh with a clutch cylinder and gear (178) secured to the lay shaft 146. A clutch gear (100) rotatably mounted on the input shaft (46) and a clutch gear (200) rotatably mounted on the lay shaft (146) are both in mesh with an output gear 240 on the output shaft 36 and in the front portion of the gear case (38). A pump drive gear (248) is journaled on the input shaft (46) and is adapted to be driven by the torque converter housing (262). The pump drive gear (248) is in mesh with a driven pump gear (290) on the pump drive shaft. The pump drive shaft (280) drives a lubrication pump (291) and is also a power take off. The input shaft (46) and the lay shaft (146) carry multiple disk clutches that lock the clutch gears (100 or 200) to the input or lay shafts when engaged. Switches (484) provide a warning when the clutch disk assemblies (112 or 212) and the clutch dics (114 or 214) are worn. A catch basin (334) on the outside of the gear case (38) catches any lubricant that is released while removing the external filter (326). A brake and assembly (336) encircles the output shaft 36; inside the gear case and brakes the output shaft when engaged.

Shift gear with a positive-displacement pump

Abstract: The lubricating arrangement and/or the control and actuating arrangements of shift gears, in particular automatic and infinitely variable shift gears, are supplied with pressure medium by a positive-displacement pump. The positive-displacement pump is driven at the speed of rotation of a driving motor and is designed as a suction-throttled (16) pump. Advantageously, the pump used is a radial piston pump (21).

Drive arrangement for IC engine - has additional gear, for chain to drive oil pump

Abstract: The arrangement is for the steering drive and an additional drive, of an IC engine. It has a toothed driving gear on the cam shaft, a continuous chain, toothed belt, and a device below, and driven by, the crank shaft. The device (oil pump 34) is driven by the chain (28), directly or indirectly via an additional toothed gear (30). The gearing area of the additional gear, is located within that of the driven gear (18), on the crank shaft. The two gears are located in a uniform rotary plane, and the tip circle of one is reduced, so that the teeth do not engage.

Differential gear system

Abstract: A differential gear system for use in the driveline of a motor vehicle, having a differential carrier (1) rotating in bearings of a differential housing (1) and driven via a driving gear tooth configuration; two axle shaft gears (10, 11) rotating in bearings of the differential carrier, which are coaxial relative to each other; and compensating gears (12, 13) eccentrically supported in, and rotating with, the differential carrier, where each of the compensating gears is in one part meshed with the one axle shaft gear (10) and in another part, with the other axle shaft gear (11), while engaging each other at least indirectly, and where the axle shaft gears (10, 11) have a tooth design which, when under torque, generates an axial thrust, and where friction-reducing means are provided at all face areas of at least the axle shaft gears (10, 11) that are subjected to loads during coasting of the motor vehicle, opposite the mating surfaces of the differential carrier (1) or the respective other axle shaft gear.

Valve containing coupled, rotatable elements to control fluid flow therethrough

Abstract: In a piezoelectric valve the actual control member (7) is formed by a displacer fluid motor (9) though which the fluid stream (5) flows. A piezoelectric actuating element (8) is disposed in the region of a displacer element (1), which can be moved by the fluid stream (5) and belongs to this fluid motor (9), and acts exploiting the inverse piezo effect during electric actuation to at least indirectly block or release this displacer element (1). The fluid motor (9) is formed preferably by a rotating piston machine, such as a gear pump.

Rotary pump assemblies

Abstract: A rotary servo fluid pump and a rotary water pump for an internal combustion engine have respective drive shafts which are both drivingly coupled to the rotor of the servo fluid pump by splines, keys, dogs or by having non-circular section shaft portions engaged in complementary non-circular bores in the rotor of the servo fluid pump. Flow passages of the two pumps are preferably formed in a common pump casing part which can be directly mounted on the engine block with the flow passages in open communication with respective flow galleries in the engine block. The casing part can then serve as a mounting bracket for the pumps on the engine.

Extruder-gear pump combination

Abstract: The invention relates to an extruder/gear pump combination. The object of the invention is to produce using simple means and in a simple manner rubber compression moulding blanks having the necessary homogeneity and uniform density for precision production. The invention consists in that the extruder/gear pump combination is equipped with a digital control of the gear pump drive for its use in a system for producing compression moulding blanks made of a rubber blend for parts production in the rubber industry.

Device for the extrusion of rubber blends and rubber-like substances

Abstract: The invention relates to a device for extruding rubber blends and rubber-like materials, consisting of a screw extruder and an injection head shaping the extrudate in a strand-shaped manner. The object of the invention is to provide an extruder/gear pump combination suitable for processing rubber blends. The invention consists in that in the device for extruding rubber materials a gear pump is disposed between the extruder and the injection head, and that the screw tip extends into the housing of the gear pump or up to a plane extending in a parallel manner to the axes of the gears of equal diameter or tangentially to the gear of larger diameter or beyond this plane into the gap between the two gears. For processing extremely sensitive rubber blends, it is expedient if the length of the extruder screw is dimensioned solely for an adequate plastication of the rubber materials to be extruded and if a two-screw extruder, the screws of which rotate in mutually opposite directions and the flights of which intermesh, is connected to this single screw extruder to build up the extrusion pressure.

Gear transfer pump with lubrication and sealing of the driveshaft and idler pin

Abstract: An improved rotary, gear within a gear transfer pump, including a pump housing having a circular pumping chamber communicating with a first port and a second port. An externally driven rotor is in meshing relationship with an internal idler gear. To enable the pump to handle an abrasive fluid medium or a non-homogenous pump fluid, an idler gear seal and a shaft seal are employed to contain pumped fluid within the pump chamber. A source of lubricating/flushing fluid is communicated to an idler gear bearing region and a shaft bearing. An idler gear seal includes a "flow resisting" side exposed to pump chamber fluid and a "flow passing" side exposed to lubricating/flushing fluid. The shaft seal includes a "flow resisting" side exposed to pump chamber pressure and a "flow-passing" side exposed to lubricating fluid. A cross-communicating fluid circuit maintains the "flow resisting " sides of both seals at substantially the same pressure. In an alternative embodiment, the flow resisting side of the idler gear seal and the flow resisting side of the shaft seal communicate with intake port pressure. By introducing the lubricating/flushing fluid at a pressure higher than the pressure to which the high-pressure sides of the seals are exposed, fluid leakage across the seal interfaces will occur from the "flow passing" sides to the "flow resisting" sides, thereby flushing the seal interfaces with the lubricating/flushing fluid. The flow of pump chamber fluid across the seal interfaces is substantially resisted.

Ductile iron gear and casting process for the production thereof

Abstract: Cast iron gears, such as those used as cam gears on engines and as used for fuel injection gear pumps, which have a hub and a rim that are thick in comparison to the relatively thin web used to interconnect the hub with the rim and a process by which such iron gears can be cast, especially in a vertical orientation. To eliminate porosity problems, single flow channel of substantial thickness is incorporated into the mold cavity which forms a flow rib that runs radially between the hub and rim of the gear being formed. To compensate for both the added weight of the rib that is produced on the web of the resultant gear, as well as to counterbalance the effect caused by the presence of a single rib, at least one opening is formed in the web at each side of the rib.

Transmission assembly with positive-displacement pump with suction throttle driven by a hydrodynamic converter

Abstract: A gear for motor vehicles provided with a positive-displacement pump for supplying a lubricating device and the control and activating devices of the gear. The positive-displacement pump is driven by the rotation of a drive motor and is provided with a suction throttle which adjusts the flow of lubricating oil such that a relatively constant flow is maintained over a varying range of rotational speeds of the drive motor. The invention provides the advantages that gear efficiency can be improved since high rotational speeds of the drive motor do not cause a excessive flow of lubricating oil.

Quiet running electric fuel pump for motor vehicle - has gear shaped impeller with sloping teeth for controlled axial thrusts

Abstract: The fuel pump has a rotating gearwheel (22) inside a gear ring (25) with inwardly facing teeth, the ring being much larger than the wheel. The gearwheel meshes on one side of the outer ring and forces the ring to rotate around the wheel. The fuel is forced in and out of lateral ducts by the changing volume of the pump chamber formed between the wheel and the ring. The wheel and ring rotate between fixed outer plates. The sloping profile of the gear teeth provide an even reaction force on the gear wheel and prevent it from vibrating with the pump action. ADVANTAGE - No pulsating pump vibrations, quiet running.