Abstract: A support structure for a plunger employed in a plunger pump, comprises a pump housing, a cylinder firmly fitted into a cylindrical hollow defined in said housing, a plunger slidably enclosed in the cylinder to provide a pumping action, a stopper arranged on an inner peripheral surface of the cylinder, and an engaging portion arranged on the outer peripheral surface of the plunger, for engaging with the stopper and for restricting an axially projecting amount of the plunger relative to the cylinder.

Abstract: The invention relates to a pump arrangement, especially for the operation of an osmotic water purifier comprising a filter housing (10) having a raw water inlet (11), a filtrate outlet (15), a reject outlet (16), and a flush valve (18) adapted to be opened for flushing raw water through the filter housing. The pump arrangement comprises a high pressure pump (12) for supplying raw water at the required pressure, and a circulation pump (13) for recirculating a relatively large flow through the filter housing. The high pressure pump (12) consists of a sliding vane pump of the type in which the vanes (24) are caused to sealingly engage the surrounding wall of the pump chamber by a hycraulic pressure supplied from the pressure side of the high pressure pump.

Abstract: A fluid pump having a rotary power source, a rotary to reciprocating motion converter in the form of a cam and cam follower, a rotary speed reducing gear train coupling the rotary power source to the rotary to reciprocating motion converter, and no pressure relief bypass is disclosed. The pressure relief function of limiting the fluid pressure within the pumping chambers to predetermined maximum pressures is provided by a pair of springs coupling a pair of opposed diaphragms of a pair of pumping chambers. The springs function as a spring-loaded lost motion coupling which absorbs energy while limiting the pressure in a pumping chamber and releases that stored energy to help power the pump while expelling fluid from the other chamber. The diaphragms are fixed relative to their respective pumping chambers about their outer peripheries and centrally coupled to their respective springs. The diaphragms are normally driven to move in unison, but cease to move in unison when one of the springs yields.

Abstract: An engine-driven pump supplies pressurized hydraulic fluid to vehicle brake and steering circuits. A ground driven variable displacement pump controlled by a control circuit is de-stroked when the engine-driven pump is operational. The variable displacement pump includes a movable piston which divides a bore into a pilot chamber and a pump chamber. An outlet line with a check valve communicates fluid one way from the pump chamber to the vehicle circuits. An inlet line with a check valve communicates fluid one way from a reservoir to the pump chamber. A ground-driven rotatable cam member reciprocates the piston. A spring urges the piston towards the cam member and towards a full stroke position. A pilot line which communicates fluid pressure from an outlet of the engine-driven pump to the pilot chamber. When the engine-driven pump is operational the pressure in the pilot line moves the piston away from the cam member, thus de-stroking the variable displacement pump.

Abstract: The invention is directed to a fuel injection pump for a two-stroke engine which is especially for portable handheld tools such as motor-driven chain saws or the like. A pneumatic drive chamber is provided in the pump housing which is partitioned by a membrane into a pulse chamber charged by the crankcase pressure and a return chamber. A membrane plate holds the membrane and charges a pump piston which plunges into a pump cylinder for injecting fuel when a pulse is present in the pulse chamber. The pump piston draws fuel in by suction during a return stroke of the membrane plate into a start position determined by a stop. The stop is configured so as to be displaceable in the direction of the stroke of the piston in dependence upon temperature in order to obtain an adaptation of the injected quantity of fuel to the operating temperature of the engine. In this way, the stroke of the pump piston can be varied and therefore also the quantity of fuel supplied by the pump.

Abstract: The invention is directed to a fuel injection pump for a two-stroke engine mounted in a work apparatus such as a motor-driven chain saw. The injection pump includes a pneumatic drive chamber which is charged with the crankcase pressure of the two-stroke engine. A membrane mounted in the drive chamber transmits the pulses of the crankcase pressure to a pump piston which moves into a pump chamber against the force of a leaf spring. The leaf spring is configured as a leaf spring packet of individual leaf springs in order to obtain an adaptation of the injected fuel quantity to the position of the throttle flap of the engine.

Abstract: The invention relates to a radial piston engine, particularly a radial piston motor comprising a cylinder block within which a plurality of pistons and rollers are reciprocally mounted for cooperation with a cam path provided by a cam disc. Detent means are used to releasably locate the cylinders and rollers in a position corresponding with the lower dead point position of the pistons.

Abstract: In axial plunger pump of the type wherein a swash plate is rotated while a cylinder body is kept stationary, plungers are axially slidably inserted into respective cylinder bores in the cylinder body, and the rotating swash plate cooperates with the plungers to obtain an axial stroke movement thereof for a pump operation. A stopper member is provided for cooperation with the plungers so that the stroke movement of the plunger in a direction toward the swash plate is limited. An actuator is provided for controlling an axial position of the stopper plate for obtaining desired variations of the effective stroke of the plungers.

Abstract: A power source (14) rotates an eccentric (20) engaged within the center of a relatively large drive roller (22) to rotate the drive roller while simultaneously orbiting the center of the drive roller about a circular path so as to cyclically advance and retract from piston assemblies (24) located within pump assemblies (16a-16d). Rotation of the eccentric (20) causes each piston assembly (24) to cyclically advance against and retract from a flexible diaphragm (26) to cause fluid entering the pump assembly to be forced out under pressure. Each diaphragm (26) is "backed" by a spring-loaded support (27) that resiliently pushes against the side of the diaphragm opposite the piston assembly.

Abstract: A pressure responsive driver couples a reciprocating motor output to a reciprocable piston of a double-acting pump. In one embodiment, the driver comprises a single spring and in another a pair of springs, which transfer reciprocation forces of the motor output to the piston to reciprocate the piston through its pumping strokes. The spring(s) transfers the entirety of the reciprocation forces of the motor output to the piston until a selected outlet pressure from the pump is reached, whereupon the spring(s) compresses to absorb cranking forces and limit maximum pump outlet pressure to about the selected pressure. The reciprocating motion of the motor output is divided between the spring(s) and piston, such that the extent of flexure of the spring(s) is inversely proportional to movement of the piston, whereby the spring(s) takes up any motion of the motor output not used to move the piston.

Abstract: A free-piston compressor which has a cylinder, a compressor piston disposed movably in the cylinder, thereby first and second chambers being formed in the cylinder, a low pressure pipe coupled to the first chamber through which pipe, low pressure fluid flows, a high pressure pipe coupled to the first chamber through which, high pressure fluid flows, two valves coupled between the low pressure and high pressure pipes, and the second chamber, a control device for controlling the two valves in a manner that a dead point position of the compressor piston is kept at a target point, and driving means for driving the compressor piston.

Abstract: A power source (14) rotates an eccentric (20) engaged within the center of a relatively large drive roller (22) to rotate the drive roller while simultaneously orbiting the center of the drive roller about a circular path so as to cyclically advance and retract from piston assemblies (24) located within pump assemblies (16a-16d). Rotation of the eccentric (20) causes each piston assembly (24) to cyclically advance against and retract from a flexible diaphragm (26) to cause fluid entering the pump assembly to be forced out under pressure. Each diaphragm (26) is "backed" by a spring-loaded support (27) that resiliently pushes against the side of the diaphragm opposite the piston assembly.

Abstract: A driving device for a double bellows dispensing unit is disclosed. The device includes a cylinder slidably mounted on a fixed vertical shaft and a plate mounted on the cylinder. The plate is connected with the dispensing unit. A rotary cam and cam follower cooperate to impart oscillating motion to the plate upon upward movement of the cylinder along the shaft. A control valve controls the flow of fluid under pressure to the cylinder for selectively displacing the cylinder in opposite directions. When the cylinder is displaced downwardly by the control valve, the cam and cam follower are disengaged, so that the oscillating motion stops.

Abstract: A pump comprising a housing and two end covers receiving a drive shaft with an eccentric thereon and with a plurality of radial pistons displaceable in radial bores provided in the housing and biased by springs. An inlet passage and an outlet passage are provided in each bore receiving the radial piston. A sealing disc is inserted between the housing and one of the end covers. Sealed through openings for high pressure medium are provided in the sealing disc. The maximal feeding flow of the pressure medium is limited by throttled passages provided in the sealing disc. A pressure control valve is provided, which is connected to an inner chamber of the housing, accommodating the eccentric.

Abstract: A control circuit for a radial piston pump that uses a four position control valve and an orifice to regulate fluid flow from the stroke control chamber to the pump inlet. The control valve also regulates the addition of high pressure fluid for destroking the pump and provides pressure relief of the pump output during destroking to eliminate pressure spikes. Elimination of pressure spikes is done by an overshoot function which relieves high pressure output fluid directly to the pump inlet and to the pump control chamber while also venting the pump control chamber to the pump inlet. V-notch openings in the control valve for regulating the addition of high pressure fluid to the stroke control chamber enhance control during steady state operations. The circuit also uses a down sized orifice between the stroke control chamber and the pump inlet which allows a portion of the pump destroking phase to be done by piston leakage flow, thereby minimizing control fluid usage.

Abstract: A lubricating-oil pump is disclosed for a motor-driven apparatus such as a chain saw. The lubricating-oil pump delivers lubricating oil to a tool. The supply of lubricating oil from the oil pump to the tool can be interrupted. For example, in this way the flow of oil can be stopped when an accessory tool or the like is mounted on the motor-driven apparatus which requires no lubricating oil during operating.

Abstract: A pump system having a main pump and a plurality of subsidiary pumps each of which has a relatively low pressure compartment from which fluid may be pumped to a relatively high pressure compartment. The main pump preferably operates continuously, but each of the subsidiary pumps is inactive until such time as it is elected to be operated, whereupon high pressure fluid from the main pump may be directed to such subsidiary pump. The pump system is particularly adapted for use in conjunction with an automotive engine.

Abstract: In a free piston type oscillating compressor, closed spaces separate from gas springs are provided, and pressures of the closed spaces are regulated, whereby the amplitude, and central position of the stroke, of a free piston can be precisely controlled.

Abstract: In volumetric dosing of liquids, equal mounts of a liquid must be added in equal time intervals to a primary flow which may consist of either liquid or gaseous substances. This is done most accurately by means of piston pumps as dosing pumps.The dosing pump according to the invention affords simple design and reliable operation. The piston stroke is fixed by means of a collar in a limiting chamber. The compensation required to prevent double fits and compensates for wear, tolerances, etc. is obtained by an elastic length equalizer in the connecting rod. This arrangement leads to being normally represented as a rigid connection which, however, in the two end positions of the piston, when the forces rise suddenly due to the collar striking the limiters, equalizes these forces over the length.

Abstract: A reciprocating piston compressor which is driven by a rotating camshaft and cam. An auxiliary piston is located below the compression piston. The auxiliary piston is movable by a regulated control pressure against the compression piston so that the compression piston is stopped at its top dead center position. Thus, the reciprocating piston compressor is disabled since the compression piston is no longer driven by the rotating camshaft and cam.

Abstract: A backup fuel pump (16) has a thermal fuse (40) positioned in a bearing. The fuse is adapted to melt at a predetermined temperature during dry running of the pump. Melting of the fuse causes a spring urged braking member (42) to screw into a shaft journal (26) and terminate operation of the pump.

Abstract: The present invention relates to a reciprocating pump in which a plunger is reciprocated by means of a crankshaft, a connecting rod and a crosshead. The reciprocating pump further includes cushioning means which is disposed between the crosshead and the plunger and capable of adjusting its cushioning force and absorbing the plunger stroke, whereby the delivery pressure is adjustable through adjustment of the cushioning force of the cushioning means and the delivery volume or rate is also adjustable through absorption of the plunger stroke by the cushioning means.

Abstract: A pump displacement control valve alternately connects charge pressure and pump output high pressure to the displacement control chamber of a variable displacement pump and includes a check valve which prevents high pressure fluid from entering the charging circuit.

Abstract: A rotary fuel injection pump having a rotary charge pump and a stroke control mechanism for variably limiting the outward stroke of a pair of diametrically opposed reciprocable pumping plungers of the charge pump for controlling the fuel charge measure delivered by the charge pump. Several embodiments of a stroke control mechanism are disclosed which include a generally U-shaped abutment yoke mounted within a diametral slot in the pump rotor for engagement by inclined ramps on the outer ends of the charge pump plungers and axially adjustable within the rotor slot for variably limiting the outward stroke of the plungers.

Abstract: Disclosed is an apparatus for arranging an oil pressure pump in a motor-cycle equipped with an engine consisting of front and rear engine blocks that project to the right and left from a car frame and are deviated from each other in the longitudinal direction of the car frame. The oil pressure pump is disposed at the rear of the front engine block which is curved forward with respect to the frame.

Abstract: In a vehicle having an engine and a cooling system for the engine including means for circulating a coolant through the engine, a fluid motor driven fan disposed in operative relation with the radiator and an engine driven pump operatively connected to the fluid motor, a means for controlling the operation of the cooling system generally consisting of a first means operatively connected to the pump and responsive to an output pressure of the pump above a first predetermined pressure for setting the output pressure of the pump at the first predetermined pressure, and second means operatively connected to the pump and responsive to an output pressure of the pump above a second predetermined pressure and a predetermined temperature of the coolant for setting the output pressure of the pump at the second predetermined pressure.

Abstract: A combination airless paint pump and air compressor wherein a prime mover drives an eccentric cam wheel within an oil reservoir housing. A piston, movably received within a housing bore is engageable with a periphery of the cam wheel to load an hydraulic column open to the piston cylinder for oscillating a paint spray pump diaphragm. A second piston member, received in a bore open to the housing, is engageable with the periphery of the cam wheel spaced circumferentially of the paint pump piston. The second piston is operatively connected with an air pump diaphragm. Selector means are provided to disengage, selectively, either one of the pistons from contact with the cam wheel whereby the unit can operate in a paint only mode, an air only mode or a combination air and paint mode.

Abstract: A hydraulic generator with a free-piston engine and hydropneumatic return cushion and with an associated hydraulic-fluid pumping piston feeding a hydraulic accumulator intended to be charged between two detected levels of pressure. The generator includes a lock device for the free piston at the power-stroke dead center with voluntary control, and servo-control means for this lock device with means for detection of the aforementioned two pressure levels, to assure locking the piston in response to detection of the aforementioned highest pressure level and to assure its unlocking in response to detection of the aforementioned lowest pressure level, and thus an automatic intermittent running of said engine.

Abstract: A method and apparatus for controlling a resonant piston compressor of the type comprising an electrodynamic linear reciprocating motor adapted to be driven cyclically by an alternating current power source and having at least one piston coupled to and adapted to be driven within a selectively valved working cylinder by the linear reciprocating motor in synchronism with the frequency of the alternating current power source. Enclosed volumes of gas act as resilient gas springs coacting with the piston and with the linear reciprocating motor to form a mechanical resonant system having a resonant frequency substantially centered on the frequency of the alternating current power source. A midstroke porting arrangement is responsive to the position of the resonant piston for selectively communicating a gas spring control valve with said gas springs.

Abstract: A rotary fuel injection pump with pump plunger stroke regulating means provided by an axially adjustable abutment slide for each plunger for limiting its outward stroke in accordance with the axial position of the abutment slide established by the angular position of a control ring.

Abstract: A fuel pumping apparatus includes a rotary distributor member including bores locating pump plungers. The plungers are engaged by shoes carrying rollers. An actuating member has a leading flank and a trailing flank and is movable along a path parallel to a tangent to the bore containing the distributor member. The leading flank is movable into the path of the rollers to impart inward movement to the rollers and the associated plungers. The position of the actuating member is adjustable to determine the amount of fuel pumped by the plungers.

Abstract: An electromagnetic pump particularly adapted for use with oil burners is disclosed. The pump embodies an armature that is reciprocated by a magnetic field produced by an electromagnetic coil. The armature drives the piston of a piston pump that is adapted to pump a liquid at low volume and high pressure. The pump also embodies a diaphragm disposed in a chamber having an inlet portion on one side of the diaphragm and an outlet portion on the other. The inlet portion of the chamber is connected to a liquid supply line leading to the pump and the outlet portion is connected to the discharge of the piston pump and also to a valve-controlled vent leading to atmosphere. The diaphragm is moved in one direction only by the armature and in the opposite direction by a spring. When there is air in the liquid supply line, the vent valve is opened and the diaphragm rapidly pumps air to the atmosphere. When liquid is discharged from the vent, the valve is closed.

Abstract: Device for supplying at a constant rate a fluid utilizing apparatus with at least one fluid of variable viscosity, comprising a fluid source delivering said variable viscosity fluid, a first fluid circuit connecting said fluid source to the fluid utilizing apparatus, a second fluid circuit in which flows a constant viscosity fluid, two volumetric pumps mechanically coupled so that their flow rates are in a fixed relationship, a first one of the two pumps being inserted in the first fluid circuit, whereas the second pump is inserted in the second fluid circuit, and adjusting means inserted in the second fluid circuit, downstream of the second pump, for adjusting the flow rate of the constant viscosity fluid. The supply device is particularly suitable for supplying a spray gun with paint.

Abstract: A pump assembly for an hydraulic braking system comprises a housing having an inlet for connection to a tank for liquid, an outlet for connection to an hydraulic accumulator, and a piston reciprocably mounted in a bore in the housing to draw liquid into a working chamber during an induction stroke and to force it to the outlet during a power stroke. A drive mechanism is provided for moving the piston in one direction during the induction stroke, and the piston is moved in the opposite direction during the power stroke by subjecting the piston to pressure at the outlet.

Abstract: A fuel injection pump, especially for internal combustion engines, which includes a pump piston axially displaceable in a cylinder of a pump housing and operable by a cam of a camshaft through the intervention of a rocker. For controlling the quantity of the fuel to be injected, the circumference of the piston is provided with an oblique control groove for cooperation with a control bore in the cylinder. The rocker is pivotally connected to the pump piston and in spaced relationship to the piston is under the load of a spring determining the maximum injection pressure. Between the area where the spring acts upon the rocker and where the rocker is pivotally connected to the pump piston, the rocker is provided with a roller adapted to roll on the cam while the spring presses the rocker in fuel feeding direction against an abutment.

Abstract: Designs for variably controlling the maximum quantity of fuel which can be delivered by a pumping stroke of pumping plungers are disclosed. These include combinations of resilient and rigid leaf spring arrangements for controlling the maximum pumping stroke with and without speed responsive control valves or cams, to provide excess fuel for starting and for shaping the maximum fuel delivery curve according to speed.

Abstract: Adjustments are preset to factory specifications, during assembly of a vehicle engine, which limit the maximum amount of fuel, per stroke, being injected by each injection pump. Because of these preset adjustments, an increase in fuel temperature above a critical point can cause a power loss. A compensator (30) is provided to vary the preset adjustments. The compensator includes a member (70) which responds to fuel temperature increase and permits more volume of fuel per stroke to be injected by each injection pump.

Abstract: A fuel pump for providing fuel at relatively high pressure is activated by gas pressure, created during the compression stroke of an internal combustion engine. The pump includes a piston and a hollow plunger which are biased by a single spring in opposite directions. The piston, which is exposed to gases in the engine's cylinder, is urged, by the gas pressure in the cylinder during the compression stroke, to move upwardly. A limit is placed on the piston's upward stroke. When reaching the upward limit the pressure which is applied to fuel in a fuel chamber is only a function of the force applied by the spring to the plunger. When fuel ejection is enabled, the spring pushes the plunger toward the fuel chamber to eject the fuel therefrom. Toward the end of the exhaust stroke the piston moves toward the engine cylinder, forcing the plunger to move in the same direction until the latter's travel is limited by limiting means. Fuel is then injectable into the fuel chamber for subsequent ejection.

Abstract: The disclosed liquid fuel injection pump is suited for the delivery of measured charges of liquid fuel under high pressure sequentially to the cylinders of an associated engine and includes a free piston type plunger reciprocably mounted in a pump chamber, wherein the charges are pressurized to high pressure, a stop for the pump plunger to limit the maximum volume of the chamber, a hub mounting a plurality of rollers to engage the camming surface of a tappet interposed between the plungers and the rollers to drive the pump plungers in a direction to reduce the volume of the pump chamber, and hydraulic means to power said pump plunger in the opposite direction.

Abstract: A fuel injection system for an internal combustion engine is described, which provides for independent, flexible control of timing as well as quantity of fuel injected. The system is programmable for torque shaping and adaptable to a wide range of engine sizes. It uses piezoelectric valves for controlling injection timing, a shuttle, fuel meter and a gas driven high pressure pump for injecting the fuel into the cylinders.

Abstract: A differential comprises a pair of face gears, a carrier rotatably mounted between the face gears and a plurality of pinion gears rotatably mounted on the carrier and intermeshing with the face gears for differentially permitting one face gear to rotate relative to the other face gear. The pinion gears are each rotatably mounted in bearings and a lubrication system is provided for pumping lubricating fluid to the bearings for lubrication and cooling purposes. The lubrication system comprises a double-acting pump mounted adjacent to the carrier and a rocker arm pivotally mounted adjacent to each end of the pump. A first end of the rocker arm engages a cam attached to the carrier whereas a second thereof engages an end of a piston rod reciprocably mounted in the pump to pump lubricating fluid to the bearing.

Abstract: The primary coolant pump of a nuclear reactor, which is usually driven electrically, can be accelerated in the event of a line break by the escaping coolant to such an extent that its mechanical strength is in jeopardy due to overspeed. According to the invention, a brake and/or shut-off means, which can be controlled by the pump pressure differential or the pump speed, are associated with the pump. The invention is of interest particularly for pressurized-water reactors.

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.

Abstract: A lubrication pump comprises a housing having a cup-shaped member reciprocally mounted thereon, a rod secured to the member and disposed internally thereof, a piston slidably mounted on the rod to define an expansible working chamber between the piston and the housing, a first check valve for communicating lubricating fluid into the chamber upon upward movement of the piston and a second check valve for communicating pressurized lubricating fluid exteriorly of the pump upon downward movement of the piston. A first coil spring is preferably mounted between the piston and member whereas a second coil spring is preferably mounted between the base of the housing and the piston.

Abstract: A variable displacement hydraulic system includes a charge system having a substantially constant charge pressure, a reciprocating piston type pump having a drive chamber in communication with the charge system, and a control valve regulating the flow of fluid from the charge system to the inlet of the reciprocating piston type pump which is manually movable from a closed fluid blocking position through a first range in which it varies and controls the quantity of fluid flowing to the pump inlet and a second range in which it varies the control of pressure of fluid flowing to the pump inlet at flow rates greater than those obtainable in the first range.

Abstract: A fuel delivery system comprised of a differential having three associated shafts. A first shaft is rotated at a speed responsive to the engine speed and drives the differential. A second shaft is driven by the differential against a variable retarding torque, which torque varies the speed of the second shaft. A third shaft is driven by the differential and drives a variable speed, fixed displacement fuel pump at a speed responsive to the speed of the second shaft combined with the speed of the first shaft.

Abstract: A fuel injection pump for supplying fuel to an internal combustion engine includes a pair of pumping plungers which are actuated by cam lobes formed on the internal periphery of an annular cam ring. Roller carrying shoes are interposed between the plungers and the cam lobes and are axially movable. The cam profile varies throughout its axial length so that variation in the axial setting of the shoes varies the amount of fuel supplied by the pump.