Showing papers on "Gear pump published in 1975"

Gear Shape and Theoretical Flow Rate in Internal Gear Pumps

Abstract: A study is made of the shape of internal gear pumps, or Gerotors, with particular reference to the curvature of the gear teeth and the effect of the tooth shapes on the flow rate. Methods are sugge...

Combined fixed and variable displacement pump system

Abstract: A hydraulic pump arrangement and control circuit for supplying fluid at high volume and a high pressure to a work circuit. The system utilizes a fixed displacement pump, a variable displacement pump, a dual pressure compensator, and an unloading valve working together to provide high pressure fluid delivery while reducing the horsepower requirements of the fixed displacement pump and the variable displacement pump. High flow is provided through the utilization of the combined pumps and high pressure is attained through the unloading of the fixed displacement pump through the unloading valve and destroking of the variable displacement pump in response to signals provided by the dual pressure compensator.

Dual motor hydrostatic drive system

Abstract: A pair of hydraulic motors are operatively drivingly connected to a common rotatable member and are employed for transmitting power thereto from a pair of prime movers. A first hydraulic circuit communicates with one of the hydraulic motors and includes a pump driven by one of the prime movers while a second hydraulic circuit communicates with the other of the hydraulic motors and includes a fixed displacement pump and a variable displacement pump driven by the other prime mover. A device associated with the variable displacement pump is responsive to fluid pressures in the first and second hydraulic circuits for automatically varying the output displacement of the variable displacement pump so that a predetermined relationship is maintained between the fluid pressures in the first and second hydraulic circuit.

Low energy recovery compounding and fabricating systems for plastic materials

Abstract: Plastics recovery and polyolefins compounding systems utilize a gear pump for the pumping function. The gear pump is specially designed to include a free media surrounding substantially the entire gear face with minimum sealing to improve volumetric pump efficiencies and provide pumping capacity insensitivity to viscosity over a wide range. A method of monitoring melt index and production rate for reactor control is also disclosed.

Transmission synchronizing mechanism

Abstract: An electronic means senses the difference in rotational speed between a main shaft gear to be engaged and the main shaft, and actuates a friction disc assembly to connect the low gear to the main shaft to accelerate the countershaft and thus the gear to be engaged if the gear speed is lower than the main shaft speed, and to connect the first gear to the transmission casing to decelerate the countershaft and thus the gear if the gear speed is higher than the main shaft speed, shifting from neutral into the desired gear ratio is prevented until the gear and main shaft speeds are synchronized.

Overdrive mechanism for automotive power transmission

Abstract: An overdrive mechanism disposed between a torque converter and change gear mechanism of an automatic transmission and responsive to the change gear mechanism. An input shaft to the change gear mechanism consists of two sections that are coupled by a clutch during normal power transmission. The driving section of the input shaft is connected to the turbine runner of the torque converter. A planetary gear train has a carrier operatively responsive to the pump impeller of the torque converter and a sun gear controlled by an overdrive brake. When the brake locks the sun gear against rotation during overdrive, the ring gear of the planetary gear train is rotated by the pump impeller and drives the second section of the input shaft through the clutch. The clutch is disengaged from the driving section of the input shaft during overdrive, thus by-passing power transmission from the turbine runner of the torque converter to the changer gear mechanism.

Split-torque power transmission

Abstract: A relatively inexpensive simplified type of split-torque power transmission. A simple planetary gear assembly is employed having a carrier connected to the input with a set of planet gears, a ring gear, and a sun gear. Suitable speed-varying means are used, such as two variable-stroke hydraulic units, each having rotary shafts and driving relation therewith, the two units being hydraulically connected together so that one serves as a pump while the other serves as a motor, and vice versa. Two gear trains respectively connect the ring gear to the first rotary shaft and the sun gear to the second rotary shaft. A first clutch means connects the first rotary shaft in driving relation to the output means, and a second clutch means connects the second rotary shaft in driving relation to the output shaft. A three-range transmission and a four-range transmission are also shown.

Drive systems for mining apparatus

Abstract: A drive system, particularly for mining apparatus employing chains, which has a fluid control circuit coupled to a ring gear of planetary gearing transmitting drive from a motor. The control circuit has a pump drivably coupled to the ring gear and the fluid outlet from the pump can be blocked to lock the ring gear and permit transmission of force through the planetary gearing. In the event of abnormal loading the outlet from the pump is opened automatically to allow fluid to flow at a pre-determined flow rate. This in turn allows the ring gear to rotate to break the transmission and the system can be gently braked without danger.

Battery powered fluid transfer apparatus

Abstract: The present disclosure is directed to a fluid transfer apparatus of the battery powered type for use in remote locations where conventional power sources such as 110V ac is not available. The apparatus employs a motor driven positive displacement gear pump having supply and discharge lines. The motor is equipped with a reversing switch and battery connection cables.

Reversible lubricant pump

Abstract: A reversible lubricant pump supplies oil to one of a pair of tandem drive axles. The pump includes a housing mounted on the axle helical gear cover to receive oil from an oil sump within the axle casing and to discharge oil to various components within the drive axle assembly. A drive gear and a driven gear are mounted within the housing for rotation in either direction to pump oil from a common inlet passage to a common outlet passage. The drive gear is mounted on a pump shaft which extends from within the housing to within the axle helical gear cover and has a pump gear fixedly mounted thereon. The pump gear is driven in response to movement of an input shaft of the axle assembly to cause the pump to operate in both the forward and reverse directions. A lubricating port within the housing extends from the pump discharge to the bearing of the pump shaft to provide the pump shaft with lubrication when the drive axle assembly is operated in the forward direction.

Numerically controlled reversible gear system for removing backlash

Abstract: A numerically controlled reversible gear system with a main output gear using two driving gears with a same number of teeth each coupled to respective one of a pair of pulse motors with same specifications connected to a single controlling equipment, wherein the driving gears are meshed with said main gear after rotationally shifting them in opposite direction by a same number of teeth within a range of attraction of respective phase of the pulse motors and either one gear acts as a driving element depending upon the direction of rotation so as to eliminate backlash of the main gear.

Gear machine with bearing cooling and lubrication

Abstract: A gear machine, such as a gear pump or gear motor, has a housing in a chamber of which there are journalled two gears which mesh with one another. The shafts of the gears are journalled for rotation in bearing sleeves. The housing has an intake for fluid at low pressure and an outlet for fluid at high pressure. The gaps between the teeth of the gears which receive fluid at low pressure communicate with the intake exclusively by way of passages which extend in part along the sleeves and shafts, so that the entire quantity of incoming fluid is compelled to travel in these passages and to cool and lubricate the sleeves and shafts.

Flow compensating emergency hydraulic system

Abstract: An Emergency or back-up Hydraulic System for use with a primary hydraulic system in motor operated equipment is disclosed. The system illustrated is a steering system for a vehicle and includes a motor driven pump and a wheel driven pump for supplying hydraulic fluid to the steering system of the vehicle. The motor driven pump and the wheel driven pump are connected in series so that the fluid discharged from the motor driven pump is supplied to the inlet of the wheel driven pump. The inlet of the wheel driven pump also communicates with the reservoir as for example through the anticavitation check for the engine driven pump. By-pass connections are provided around the wheel driven pump so that fluid in excess of the demands of that pump are channelled to the steering circuit when the engine driven pump is in operation. The system disclosed provides that the demands of the wheel driven pump are met by the engine driven pump and/or the reservoir depending upon the relative speeds and capacities of the engine and the wheel driven pumps. The system disclosed is flow limiting so that the steering or other hydraulic system is not overwhelmed when both pumps are in operation.

Gear type pump or motor with radial balancing

Abstract: An external gear pump wherein the gears are installed in an eight-shaped compartment of a central housing section which is flanked by two covers. The outlet port of the housing communicates with two arcuate recesses for metallic inserts which are biased against the adjacent gears by fluid pressure in the outlet port whereby the inserts urge the gears against those portions of the internal surface of the central housing section which are located opposite the recesses. Such portions of the internal surface are formed with narrow first cutouts which communicate with the outlet port. The internal surface is further formed with relatively wide additional cutouts which are located between the first cutouts and the recesses and communicate with the inlet port. The force which is produced by fluid in the cutouts opposes the force which urges the gears against the internal surface of the central housing section to thus reduce the force with which the stubs of the gear shafts are urged against the housing.

Hydraulic circuit for controlling actuators in a construction vehicle

Abstract: A hydraulic circuit for controlling actuators in a construction vehicle which comprises an engine, a fixed displacement pump driven by said engine, a variable displacement pump driven by said engine, a controlling cylinder connected to the variable displacement pump for controlling the displacement thereof, an orifice provided between the output of the fixed displacement pump and a tank and, an unloading valve connected to the fixed displacement pump and also to the variable displacement pump via a pilot line for selectively unloading an output fluid from the fixed displacement pump when it is open.

Variable transmission with hydraulically controlled 'V' belt pulleys - one side of each pulley produced as piston supplied with pressure regulated hydraulic fluid

Abstract: A continuously variable power transmission system uses hydraulically controlled 'V' belt pulleys to vary the transmission ratio. The input pulley consists of a fixed section (4) coupled to the input shaft (1). The moving side of the pulley is formed by a hydraulic piston (3). A similar unit is used for the output pulley with the exception that the piston diameter (6) is smaller than the input piston. The pressure applied to the output stage (Ps) is determined by the spring rating (16) of a relief valve (14) in the supply line from a gear pump (13). The pump output is also taken over a spool valve (18) to regulate the pressure (Pp) applied to the input pulley. Once the secondary pressure has been set at a constant value the primary pressure (Pp) may be regulated to give the required transmission ratio.

Hydraulic torque converting wheel

Abstract: The combination of a hydraulic torque converter and planetary gear system in a wheel hub characterized in that the selective speed control of an individual wheel is achieved through the hydraulic torque converter, thereby obviating the need of gear shifting as in the anterior combinations. This hydraulic torque converting wheel includes a spindle, a tight casing rotating on the spindle and sealed relative to the latter, a rim surrounding the casing and forming a wheel hub therewith, a planetary gear system including an input gear, a planet carrier, planet gears and a first and a second output gears, torque converting blades and fins mounted inside the rotatable casing, the input gear drives the planet carrier and the planet gears which drive the blades through the first output gear and the casing through the second output gear; the blades drive the casing by torque converting cooperation with the fins, and a selective speed control is connected to the blades to rotate the latter relative to the fins and thus change the torque converting relationship therewith.

Variable capacity type gear pump

Abstract: This invention relates to a variable capacity type gear pump which is capable of operating efficiently by flowing out by-passed liquid under extremely low pressure to adjust or control the amount of feed-out liquid. This is accomplished by providing the walls of the casing (housing) of the gear pump with ports or slits, which ports or slits are connected to a controlling valve in order to remove the desired amount of by-passed liquid.

Hydraulic circuit for steering control in articulate vehicles

Abstract: A hydraulic circuit for steering control in articulate vehicles which comprises an engine, a fixed displacement pump driven by the engine, a variable displacement pump driven by the engine, an exit port of the variable displacement pump being connected to a control valve of a steering actuator, an orifice provided at an outlet side of the fixed displacement pump and, a controlling cylinder connected to the variable displacement pump for controlling displacement of the variable displacement pump, the controlling cylinder being actuated by a spring disposed therein and a differential hydraulic pressure at the orifice.

Apparatus for equalizing mass forces of a reciprocating piston, crankshaft engine

Abstract: Apparatus for balancing or equalizing the mass forces of an engine having reciprocating pistons turning a crankshaft rotates a drive gear twice as fast as the crankshaft. A planetary gear is eccentrically carried on the drive gear and meshes with internal teeth on a stationary sun gear at a gear ratio of 1:2. The planetary gear has an eccentrically placed counterweight of a mass such that it balances the mass forces of the engine of the same order as the ratio of drive gear to crankshaft speed, Order II mass forces for this example. The drive gear also has an eccentrically placed counterweight which balances the planetary gear as they rotate with the drive gear. The counterweight on the planetary gear is preferably placed as near as possible to the pitch diameter of the planetary gear so as to make its path of travel as nearly linear as possible.

Helical gear pump and method of manufacturing the same

Abstract: A helical gear pump in which the rotor is made of a wire or bar wound into a cylindrical helix. The rotor is made by twisting two wires or bars around each other, separating the two helices so formed, and using one or both of them as a rotor. The stator is made of a tube of plastics which is formed by inserting into the tube a mandrel having threads correspondng to required internal threads of the stator, causing the plastics tube to soften and applying external pressure to it to make its inside assume a shape corresponding to that of the mandrel. The mandrel is made by winding helically two wires about a third straight wire and securing the first-mentioned two wires to the third wire, all the said wires having about the same diameter as the wire of which the rotor is made.

Railway points change system using electro-mechanical drive - has protecting hydrostatic torque clutch

Abstract: The electric motor and the transmission parts of the drive are protected against damaging influences by a hydrostatic clutch incorporating a two-geared gear pump in a housing. One of the pump gears is centrally positioned within the housing, with both acting as drive-resp. take-off for the clutch. The respective pressure chamber of the pump is connected to the suction chamber via two parallel pressure medium circuits. Each circuit contains a pressure relief valve. The opening force of the valves is adjustable. Each valve blocks in a direction opposite to that of the other circuit.

Continuously variable transmission for vehicles - with high torque transfer at low rotational speed by governed hydraulic system

Abstract: At least one planetary gear is fitted between the input and output shafts, and at least one hydraulic pump is connected to an element of the planetary gear and via passages and adjustable valves to a hydraulic drive unit, e.g. a turbine or a hydraulic motor. This is connected directly or indirectly to the output shaft, and operates under the influence of a centrifugal governor. If a pair of planetary gears is fitted, one hydraulic pump may be driven by both gears, or two pumps may be driven in parallel.

Gear type hydraulic pump for lubricating oil - of unitary construction with driving motor and priming pump

Abstract: A central shaft carries the rotor laminations The motor has a cast casing surrounded by a steel cylinder leaving a gap between them The front end plate carries a bearing and a shaft seal The shaft projects through it and carries a centrifugal pump impeller behind which is a pump end cover Fluid from the pump flows through the gap between casing and cylinder to the back end of the motor where the end plate has radial channels taking fluid down into the gear pump The gear pump is mounted on a shaft extension projecting through the end plate which also carries a bearing and seal

Reversible gear system for removing backlash - has separate drive gears for opposite directions of rotation

Abstract: The numerically controlled reversible gear system has a main output gear using two driving gears with the same number of teeth. Each gear is coupled to one of a pair of pulse motors connected to a single control equipment. The driving gears are meshed with the main gear after rotationally shifting them in the opposite direction by the same number of teeth within a range of attraction of respective phase of the pulse motors, and either gear acts as a driving element depending upon the direction of rotation so as to eliminate backlash of the main gear.

Gear pump with shaft bearing bushings in housing - drive shaft end is externally sealed within bearing cover

Abstract: Gear pump has an internal cavity in the housing cross section for the gear chambers and the liq inlet and outlet connections; the housing has 2 opposed gears on shafts mounted in bearing bushings in the housing A cover, with a seal on both sides, is attached to the housing The housings are in bearing housings which form common shaped parts with the covers or are fast to them Grooves to receive sealing rings are on the covers and are open outward and with a taper Preferably, the end of the drive shaft is externally sealed within the cover on which it is guided and sealed by O-rings The pump is easily dismantled and assembled, with good accessibility of all parts for cleaning

Fast action coupling between rotating shafts - provides rapid test of rotating machinery by spline coupling and clamping to motor drive

Abstract: For test purposes a rotary machine, e.g. gear pump, must be rapidly coupled to a drive unit. The output shaft of an electric motor carries a sleeve coupled by a key. A clamping ring is located within the sleeve. A gear pump has a main shaft and gear drive with free wheel gears. The gears are mounted in a main gear plate sandwiched between the main body halves. A sealing ring locates in the end cap and the shaft is carried by a ball bearing race. A locating disc aligns the pump with the test coupling and a clamp secures the pump. A peg prevents rotation of the pump. Coupling of the pump is by an adaptor on the spline that fits into the clamping ring.

Test instrument for hydraulic systems - uses hydraulic gear pump to measure throughput with tachometer on pump shaft

Abstract: Test instrument for testing the output of open or closed hydraulic systems, especially for agricultural machines and vehicles where the test instrument has a special displays for pressure, temperature and through put of the hydraulic medium. To measure the through put, the test instrument has a conventional hydraulic pump, which runs empty and the pump shaft has a conventional revolutionary speed indicator. The pump is a gear pump and the pump shaft is connected with the speed indicator by a tacho-shaft. An adjustable choke valve or pressure limiting valve is fitted in the test line before the hydraulic pump.

Mechanical motion detector

Abstract: A housing defines a fluid enclosure which contains a gear pump having a driving gear that couples for rotation by a shaft. When the shaft rotates, the gear pump forces fluid through one of two fluid passages in the housing against the force of a valve spring. A torque which remains relatively constant over a wide range of shaft speeds is thus applied to the housing, and in reaction the housing rotates to operate an electrical switch.

Stepless variable speed transmission unit - has bevel drive altered by gear pump driven from input shaft

Abstract: A stepless variable speed transmission unit has between its input and output shaft a variable bevel wheel arrangement actuated by a pair of pistons which force a bevel wheel carrier spindle in a direction of right angles to the shafts, actuated by a gear pump which is driven from the input shaft through spur gearing, the fluid being pumped around an external circuit.