Showing papers on "Gear pump published in 1976"

Gear pump with low pressure shaft lubrication

Abstract: A gear pump is disclosed wherein the shafts of at least a pair of intermeshing gears are rotatably supported in bushings each with an axially extended lubrication groove formed in the bore of the bushing, one end of the lubrication groove being communicated through a low pressure chamber defined in the inner end face of the bushing with a portion of a suction port located adjacent to the root or dedendum circle of the gear while the other end of the lubrication groove being communicated with the suction port through a hole extended through the bushing or casing or notch formed therein, whereby part of the liquid drawn through the suction port upon rotation of the intermeshing gears is forced into the pressure chamber because of the fact that the liquid drawn into each tooth space of the gear is imparted with the impact speed directed in the radial direction of the tooth space due to the difference between the speed with which the liquid is drawn into the gear pump and the rotational speed of the intermeshing gears, and the liquid is circulated from the low pressure chamber through the lubrication groove, thereby lubricating and cooling the shafts rotating in the bushes.

Gear pump or motor with bypass throttle passage to prevent cavitation

Abstract: A gear pump or motor in which a pair of meshing gears are rotatably mounted in a housing and in which a throttle passage provides communication between a region of the housing in which, during rotation of the gears, high pressure is maintained and the region of the interstices between engaging teeth of the gears at which these interstices increase during such rotation, to prevent cavitation and to essentially reduce noise during operation.

Gear pump assembly

Abstract: A gear train is housed in a gear box having upper and lower plates in or on which gear-shaft bearings are mounted. One of the gears functions as a centrifugal gear pump for projecting lubricating oil from a sump in the tank angularly upwardly through openings in the upper bearing-mounting plate to a deflecter plate located thereabove. This oil is deflected angularly downwardly and collected in a recessed area on the upper surface of the upper bearing-mounting plate. Bearing caps are provided with radial ports through which oil collected in the recessed area flows to the bearings and working parts before returning to the sump.

Injection of additives into liquid streams

Abstract: A gear pump is modified by the incorporation of a hollow rod means to permit a liquid additive to be injected into the gear pump at the point at which the gear wheels separate. At this point the pressure is at or below atmospheric pressure and, as a result, the additive can be added uniformly and independently of the pumped liquid flow and pressure.

Pump lock-up power transmission

Abstract: A power transmission providing cushioned shock-absorption power flow from arive member to a driven member. The transmission includes a gear pump wherein both the gear and gear housing are free to rotate; the transmission also includes a recirculation flow path from the pump outlet to the pump inlet, said flow path comprising a metering valve that responds to pump outlet chamber pressure for progressively throttling the flow as the outlet chamber pressure rises. As the recirculation flow is throttled the pump gear and pump housing gradually lock together and thereafter rotate at approximately the same speed.

Partially fluid lacked vehicle drive train

Abstract: A drive train is provided with a planetary gear system including sun, planet, and internal ring gears, side plates abut the gears with the side plates being provided with oil passages aligned with teeth of the gears. The oil passages are spaced around the periphery of the gears out of alignment with a meshing point between gears. The gears are housed in an inner housing which is substantially completely filled with oil delivered from a reservoir by gravity flow. The gears advantageously lie in a single plane for ease of sealing and manufacture. Oil passing between the gears serves to cool the gears and is squeezed between meshing teeth to provide a hydraulic resistance and thus partially lock the gears.

Cooking oil cleaner and filter system for deep fat fryers

Abstract: A cooking oil cleaner and filter system for deep fat fryers which includes a fryer well for containing either cooking oil to be used in frying, and a cooking oil filtration and recirculation assembly connected to the well. The cooking oil filtration and recirculation assembly is substantially cylindrically shaped and includes a filter housing having a cylindrical outer surface connected to and longitudinally aligned with a pump housing also having a cylindrical outer surface and an aligned pump drive motor mounted on the pump housing. A suitable filter medium is disposed within a filter cavity in the filter housing with a foraminous partition extending across the filter cavity intermediate the filter medium and the pump housing. A gear pump is located in the pump housing and is drivingly secured to the pump drive motor output shaft, with the inlet port of the gear pump communicating with the filter cavity and with the outlet port communicating by means of a suitable conduit with the well. Another conduit communicates between the filter cavity and the opposite end of the well. In operation, the gear pump draws cooking oil from the well through the filter medium in the filter housing and pumps clean, filtered cooking oil from the pump housing through the connecting conduit to the opposite end of the well. The cooking oil filtration and recirculation assembly can be quickly and easily removed from the well and disassembled for cleaning or renewing the filter, and also for maintaining and servicing the gear pump.

Transmission gear mechanism

Abstract: A transmission gear mechanism having a plurality of drive gears and a shiftable driven gear. Eccentric gears are provided between the drive gears to smoothly transfer the driven gear from one drive gear to the next during shifting without interrupting the power transmission. Bearing surfaces are provided to bias the driven gear into contact with the drive and eccentric gears at all times to maintain power transmission.

Hydraulic drive for fishing reel having variable takeup ratio

Abstract: A hydraulic drive is provided for a fishing reel including a drive hydraulic pump having a drive pump member driven by a manually rotatable handle and a driven hydraulic pump having a driven pump member connected to a winding means for causing the fishing line to be wound upon a spool carried by the frame of the fishing reel. A conduit connects the drive pump and the driven pump whereby rotation of the handle forces fluid from the drive pump to the driven pump for actuating the driven pump member and driving the winding means. A flow control valve is connected in the conduit for controlling the flow rate of fluid delivered to the driven pump so that the speed of rotation of the winding means can be varied for a constant input drive speed of the drive pump.

Valve assembly for a brake system

Abstract: A hydraulic powered brake and parking brake arrangement powered by the power steering gear pump, and a pressure control assembly in the system. The control assembly acts as a pressure regulator for the parking brake actuators, provides for pressure relief to prevent a build up of excess pressure to the parking brake regulators, assures the provision of brake hold off pressure to the regulators even though the pressure from the power steering pump falls below the pressure required by the actuators, and provides for limiting the pressure available to the assembly when the power steering gear pump is working against a pressure in its upper range of capability.

Apparatus for machining bearing rolls

Abstract: An apparatus for machining bearing balls has a motor which drives, through an elastic coupling, a gear box connected by a telescoping coupling to a crown gear device. The output of the crown-gearing is applied to a rotatable disk. An electric motor drives a gear pump which has its output connected by an electromagnetic distributor to a hydraulic cylinder adapted to press the rotatable disk against a fixed disk, the balls being circulated between the disk and machine (filed, ground or lapped) therebetween.

Hydraulic power transmission

Abstract: A hydraulic power transmission of the hydrostatic type comprising a planetary network of rotary gear pumps employing a centrosymmetric internal valve control of pump fluid through the driving shaft, sun gear, and driven shaft, with external cooling of the pump fluid. A secondary hydraulic control means is incorporated to operate the internal control valve with all hydrostatic pressures confined within the pump system.

Casing for gear pump or motor

Abstract: A gear pump or motor comprises a tubular casing having an internal shoulder and an inlet and outlet for working fluid. A pair of meshing gearwheels are each mounted in the casing between a pair of rigid bearings which are disposed one on either side of the shoulder adjacent respective end plates closing the ends of the casing. Screws passing through the shoulder are provided for clamping the shoulder between the bearings and end plates. In an unclamped condition of the shoulder, the difference between the axial lengths of the shoulder and the gearwheels is greater than a predetermined operating clearance between the gearwheels and the bearings. In a clamped condition of the shoulder in the normal operating conditions of the pump or motor, the shoulder is resiliently deformed to reduce the said difference to a value at most equal to the predetermined clearance.

Hydraulic control system and method

Abstract: A hydraulic control system incorporating a variable displacement, pressure compensated hydraulic pump and means for varying the speed of the input shaft driving the variable displacement pump in proportion to the displacement of the pump.

Overspeed protection system

Abstract: A protection system to prevent the failure of a flywheel caused by an overspeed condition of a fluid pump. A positive displacement pump is coupled to, and driven by, the drive shaft of the fluid pump, and the positive displacement pump circulates a fluid into a discharge manifold. The fluid exits from the discharge manifold through an orifice, and returns to the positive displacement pump to be recirculated. Brake shoes are arrayed around the flywheel, and are connected to hydraulic cylinders, which in turn is connected by conduits to the discharge manifold. A pressure sensitive valve is installed in the conduit between the discharge manifold and the hydraulic cylinder. The pressure sensitive valve permits fluid to flow from the discharge manifold to the hydraulic cylinder whenever the pressure within the discharge manifold exceeds a predetermined level. The pressure in the discharge manifold, in turn, is related to the speed of the positive displacement pump, which is dependent upon the speed of the main pump drive shaft. Upon an overspeed condition, the positive displacement pump increases speed, circulates an increased quantity of fluid, which causes an increase in the manifold pressure, thereby causing the pressure sensitive valve to open and supply fluid to the hydraulic cylinders, which forces the brake shoes against the flywheel to absorb the acceleration torque of the drive shaft and prevent the failure of the flywheel by overspeed.

Gear pump or motor with axially movable bearing blocks

Abstract: A rotary hydraulic pump or motor has a pair of ports and a pair of meshed toothed gear elements each of which is journalled in a pair of bearing blocks. One block in each pair is fixed within a housing and the other block in each pair is slidable in the housing so that the axial faces of the gear teeth can be engaged by the axial end faces of associated blocks. The fluid pressure at the high pressure port is applied to the end faces of the sliding blocks remote from the gear elements, so that the sliding blocks are urged towards the fixed blocks.

Control arrangement for variable power transmission

Abstract: In a multi-speed planetary gear including a planet gear carrier connected to one of the primary or secondary shafts, planet gears mounted thereon, each including at least two gear sections at different diameters and at least three annular gears, i.e. sun or ring gears engaging said gear section, each of the annular gears including a friction coupling for fixing the same relative to the casing, and a servo-motor non-rotatatively mounted in the casing for controlling each of the friction couplings. A multi-position control valve controls the flow of pressurized fluid separately to each of the servo-motors. A low capacity high pressure pump delivers pressurized fluid to the control valve and a non-return valve connected in parallel with the low capacity high pressure pump opens when the servo-motor is filled. A torque converter, preferably of the releasable bladed component type may be included between the vehicle motor and the planetary gear, and in that case a control device for controlling the position of the releasable member can be operable in response to movement of the control valve.

Vehicle drive with spur gear differential - has various friction clutches for the selection of different gears

Abstract: A vehicle gear drive includes a hydrostatic torque convertor which is connected to the input shaft of a spur wheel differential gear. The two output shafts of the planetary differential gear carry a number of spur gear wheels and friction clutch discs. The spur gears are in mesh with gear wheels on a parallel shaft. All spur gear wheels are permanently in mesh. To select any one particular gear, the appropriate friction clutches are engaged. In this way all possible gear selections are obtained.

Combined timing gear and pump for rotary mechanisms

Abstract: A rotary mechanism including a housing defining an operating chamber, a shaft journalled in the housing and having an eccentric within the chamber, a rotor within the chamber and journalled on the eccentric, a timing gear carried by the housing and within the chamber and having a predetermined number of teeth, an internal ring gear carried by the rotor and meshed with the timing gear, the ring gear having a number of teeth greater than the predetermined number of the timing gear whereby a crescent-shaped gap between the gears exist. A crescent-shaped pad is carried by the eccentric within the gap and an inlet port is provided in the eccentric adjacent one corner of the pad for supplying hydraulic fluid to the gap. An outlet port is located in the eccentric adjacent the other corner of the pad for conveying pressurized hydraulic fluid to a point of use within the mechanism. The invention provides high pressure hydraulic fluid through unique use of the timing and ring gears necessary in such mechanisms.

Drive for the ignition distributor of an internal combustion engine

Abstract: An improved drive for the ignition distributor of an internal combustion engine of the type having a lubrication pump driven by its crankshaft. The pump has an internal gear driven by and coaxial with the crankshaft. An external gear has internal teeth and is driven, in planetary gear fashion, by the internal gear. A distributor shaft is rotatably mounted in the pump housing and has a helical tooth pinion gear that meshes with helical teeth on the external periphery of the external pump gear. Thus, the driven external gear drives the pinion gear and the distributor shaft. Preferably, the transmission ratio is 1 to 1.25 between the internal and external gears and 1 to 1.6 between the external and pinion gears, providing an overall ratio of 1 to 2 between crankshaft and distributor shaft.

Oil pressure machine

Abstract: PURPOSE:To obtain a precision gear pump that can resist to high pressure and high velocity, by inserting a combined body holded by side plates into a casing.

Differential internal gear pump

Abstract: PURPOSE:A high-oil-pressure pump characterised by low noise and high rigidness, wherein an internal gear is engaged with a plurality of pinions in a balanced manner.

Drive for two auxiliary devices by a single drive shaft - has one auxiliary gear wheel pump with rotary action and other auxiliary device with reciprocating motion

Abstract: Device to drive two auxiliary devices by a single drive shaft of a combustion engine, of which one is a gear pump whose direction of rotation does not depend on the sense of rotation of the drive shaft of the engine, whilst the other auxiliary device has a reciprocating motion The housing (1) in which the drive for the gear wheel pump is mounted can be constructed in two 180 deg separated positions and an actuating cam (12), attached to the drive shaft (2) of the pump operates together with a two armed lever (17) whose rotational axis can be incorporated in the housing of the pump in two positions Its position relative to the drive of the other auxiliary device remains unaltered in either position

Differential gear pump or motor

Abstract: PURPOSE:An improved gear pump or motor which can be used as a cluch mechanism for power transmission.

Multi-way valve with tubular rotary slide valve - positive displacement pump is mounted coaxial inside valve

Abstract: Multi-way valve comprises a cylindrical housing (1) with peripheral inlet and outlet openings (2, 3, 4), a hollow cylindrical rotary slide valve (5) with control openings in the cylinder wall, and inside the valve a positive-displacement pump (7) with a drive shaft (8) coaxial with the valve. The pump, the control openings and the inlet and outlet openings are disposed in the same plane. Pref. the pump is disposed in a cylindrical recess (6) in the valve eccentrically to the drive shaft, and consists of a centrifugal pump or gear pump.