Abstract: A hydraulic pump or motor having a rotor carrying radially disposed pistons. In one embodiment, the connection for introducing and withdrawing fluid at the rotor is made by manifolds which are in complemental, sliding contact against a surface of the rotor. Piston-like projections on the manifold are exposed to the pressurized fluid flowing through the apparatus to hold the manifolds in tight sealing engagement against the rotor surface. The effects of centrifugal force on the operation of the apparatus are minimized by mechanically securing the pistons against outward radial movement during high speed rotation, and by admitting and withdrawing fluid at locations relatively near the axis of rotation of the rotor. An alternate embodiment is disclosed which has a floating rotor so that the pressure of the operating fluid is used to effect a tight seal at the junction of the stationary and rotating components in the high pressure region.
Abstract: A member is formed with first and second cam protrusions. First and second movable plungers define a common pumping chamber, the volume of which varies in accordance with the position of each of the plungers. The plungers alternately engage the cam protrusions and are reciprocated thereby in synchronism with rotation of an engine crankshaft. Fuel is supplied to the pumping chamber as the pumping chamber expands. The fuel is directed out of the pumping chamber toward an engine combustion chamber to effect a fuel injection stroke as the pumping chamber contracts. The timing of engagement of one of the plungers with one of the cam protrusions and the timing of engagement of the other plunger with the other cam protrusion are offset by a preset angular interval with respect to rotation of the crankshaft, the interval being chosen so that the rate of fuel injection during an initial stage of the fuel injection stroke is relatively small.
Abstract: A blower having a stationary casing for rotatably supporting a rotor assembly having a series of open ended chambers arranged to close against the surrounding walls of the casing. Pistons are slidably mounted within each chamber with the center of rotation of the pistons being offset in regard to the center of rotation of the rotor assembly whereby the pistons reciprocate in the chambers as the rotor assembly turns. As inlet port communicates with the rotor assembly to deliver a working substance into the chamber as the pistons approach a top dead center position in the chamber while an outlet port also communicates with the rotor to exhaust the working substance as the pistons approach a bottom dead center position. The displacement of the blower is varied by adjusting the amount of eccentricity between the center of rotation of the pistons and the center of rotation of the rotor assembly.
April 30, 1984
Date of Patent:
January 7, 1986
Mechanical Technology Incorporated
Charles C. Bookout, Robert E. Stotts, Douglass R. Waring, Lawrence R. Folsom
Abstract: The invention relates to a hydraulic motor of the type comprising a plurality of cylinder-piston units arranged radially about an eccentric cam made rotatively rigid with a rotating shaft. The cam has a pair of shoes which project axially from opposite sides thereof and engage in guides formed diametrically in a pivotable support and on a rotating shaft, respectively. The shoes engage with such guides to allow for a radial displacement of the cam and provide a rotary connection of the latter to the rotating shaft. The shoes have respective cylindrical cavities formed internally in perpendicular directions to the shaft axis of rotation, cavities which accommodate small pistons whose rods are stationary relatively to the rotating shaft.
Abstract: An improved timing control mechanism is provided for an engine-driven fuel injection pump of the type having plungers actuated by an adjustable cam. The cam is adjusted by the linear displacement of a timing piston operating in a cylinder. A pressurized hydraulic fluid admitted to a pressure chamber at one end of the cylinder provides a force against one end of the timing piston which is opposed by a biasing element, such as a spring. A rotary servo valve extends into an axial bore in one end of the timing piston for controlling the flow of hydraulic fluid through a control orifice formed in the wall of the piston bore and connecting with the cylinder's pressure chamber. The servo valve is axially fixed and includes an inclined, typically helical, control edge. Upon rotation of the valve, as by an electric rotary stepper motor, the control edge effectively moves "axially" relative to the control orifice to vary flow therethrough and thus cause the piston to track that "axial" positioning of the control edge.
Abstract: A fuel injection pump of the rotary distributor type includes a cam actuated plunger housing in a bore and an adjustable fuel control member which varies the amount of fuel supplied to the bore. The pump also includes a timing piston connected to the cam, the piston being biased by a spring against the action of fuel under pressure. In order to vary the timing under certain conditions a control piston serves as an abutment for the spring and the application of pressure to the control piston is controlled by a valve which has a valve element coupled to a throttle member of the pump the valve having a housing which is secured on the exterior of the pump.
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.
March 4, 1983
Date of Patent:
January 15, 1985
C. Eugene Brady, Marcus J. Gottsche, Paul W. Stoll
Abstract: A variable displacement vane type hydraulic pump of simple construction automatically varies its output flow rate, between a maximum value and zero, in response to changes in the output pressure. The pump is characterized by a laterally shifting flow modulating member located in a central recess of a vane carrying rotor and whose lateral position is dictated by the pressure existing at the outlet port. The pump can run continuously at a no-flow condition without overheating or stalling and its rotor direction may be reversed by merely reversing the functions of its two ports.
Abstract: A hydraulic motor control system comprises a speed control loop and a pressure control loop which provide closed loop control of a variable displacement chamber space and the mechanical advantage coupling thereof to the motor output shaft. The speed control loop is effective in the speed control mode of operation to maintain a set speed within a given load range. In response to load increases beyond said range, the pressure control loop pre-empts the speed control loop so that the control operates in a constant horsepower mode.
Abstract: A fuel pumping apparatus for supplying fuel to an internal combustion engine is of the rotary distribution type in which the outward movement of pumping plungers is determined by stops, the axial position of the distribution member being adjustable to determine in conjunction with the stops the amount of fuel delivered by the apparatus. The plungers are actuated by cam lobes on a cam ring and two types of cam lobe are provided. One type of lobe provides the normal pumping action while the other type of lobe is shaped to provide an initial delivery of fuel by the apparatus in advance of the main quantity of fuel. The initial quantity can be varied by moving the cam ring angularly.
Abstract: A distributor type fuel injection pump which is provided with an eccentric connecting member coupling the timer piston of the injection timing control device to the roller holder. The eccentric connecting member comprises a first portion and a second portion eccentrically combined together. The first portion engages with the roller holder to support a predetermined one of the rollers on the roller holder, which is rotatably fitted thereon, whereas the second portion pivotably engages with the timer piston. Further provided is means for prohibiting pivotal movement of the second portion of the eccentric connecting member about the first portion of same relative to the roller holder. Displacement of the timer piston causes accurately corresponding circumferential displacement of the roller holder through the eccentric connecting member and the pivotal movement-prohibiting means to thereby achieve accurate control of the injection timing in response to the rotational speed of the engine.
Abstract: A fuel injection pumping apparatus for supplying fuel to an internal combustion engine includes a rotary distributor member which is also axially movable to determine the amount of fuel supplied by the apparatus. Fluid under pressure is supplied to the chamber to move the distributor member axially against the action of a spring and valve means is provided to control the pressure. The valve means includes a first member in the form of a spool and a second member in the form of a sleeve. The sleeve is coupled by linkage to the distributor member and the position of the spool is determined by a speed responsive governor. A land on the spool co-operates with a port to control the flow of fluid to the chamber. A groove on the spool and a port register to allow fuel flow to a pumping chamber but move out of register to halt fuel flow if the spool should move with increasing speed without there being a corresponding movement of the distributor member and sleeve to reduce the fuel delivered by the apparatus.
Abstract: A liquid fuel injection pumping apparatus of the rotary distributor type includes a cam ring which is angularly adjustable to vary the timing of delivery of fuel. The setting of the cam ring is determined by a piston in which is located a servo valve. The servo-valve has a land to control fluid flow into a cylinder containing the piston. The servo valve is spring biased and a wedge is provided between a cylindrical member engaged by a spring and the servo-valve, the wedge being movable to alter the distance of the portion of the land which controls fluid flow of the servo valve. The wedge is coupled to the output member of a speed responsive device, the output member also being coupled to a fuel quantity control of the apparatus so that the setting of the cam ring depends upon the amount of fuel delivered by the apparatus.
May 7, 1981
Date of Patent:
December 6, 1983
Lucas Industries Limited
Stanislaw J. A. Sosnowski, Robert T. J. Skinnger
Abstract: A fuel injection pumping apparatus comprises an axially movable distributor member the axial setting of which determines the amount of fuel supplied by the apparatus at each pumping stroke. The distributor member is biassed by a spring in one axial direction and is movable in the opposite direction by varying the fluid pressure in a chamber through a port. The port is formed in a sleeve which is coupled to the distributor member by means of a lever and a rod member is axially movable within the sleeve. The axial position of the rod member can be varied to alter the effective size of the port and the distributor member and sleeve move because of the change in pressure in the space. A new equilibrium position is thus established with the distributor member following the movement of the rod member.
Abstract: A fluid actuated device for driving a shaft at variable speed-torque ratios, said device including a casing, a shaft mounted for rotary motion in said casing, a radial piston drive assembly in said casing connected to said shaft, a plurality of pistons mounted for radial motion in said assembly, a plurality of pairs of cam elements positioned in said casing to define cycles of motion for said pistons and a cam lifter ring positioned to control the position of said cam elements, the position of said cam elements determining the operating speed-torque available at the shaft.
Abstract: A fuel injection pumping apparatus includes a piston located within a cylinder. The piston is connected to an annular cam ring of a rotary distributor type fuel pump to adjust the timing of delivery of fuel. A passage conveys fluid under pressure to act on the piston to move the piston against the actions of a spring. The passage includes a check valve to prevent movement of the piston and cam ring when a pump plunger is moved inwardly by a cam lobe on the cam ring and a further check valve which prevents movement of the piston and cam ring when the plunger is allowed to move outwardly by the cam lobe.
Abstract: The invention relates to a control unit for an adjustable fluid pump or motor controlled by a servomotor. The control unit is of the type having a slide valve with a neutral blocking position with supply and exhaust positions on opposite sides of the neutral position. The neutral position provides a zero pump feed condition and the improvement resides in a construction wherein the fed amount is absolutely zero. This is accomplished with a secondary valve which has a fixed part and a moveable part which moves with the actuator. The secondary valve has fluid passages which short circuit the supply and exhaust connections of the unit over a small travel range on opposite sides of the neutral position of the actuator.
Abstract: A fluid-displacement radial piston machine, such as a hydraulic pump or motor, includes an eccentric member which is mounted on a shaft for displacement radially thereof to thereby change the eccentricity of a contact surface of the eccentric member which is engaged by sliding shoes of a plurality of working pistons. An arrangement for displacing the eccentric member includes a piston component which is connected to the eccentric member by two displacing portions and whose piston portion subdivides a compartment of the shaft into two actuating chambers into which pressurized fluid is selectively admitted through respective passages in the shaft and through a rotary transmission interposed between a source of the pressurized fluid and the shaft. One check valve is interposed in each of the passages and interrupts the communication of the respective actuating chamber with the rotary transmission when no pressurized fluid is admitted into any of the passages.
Abstract: A positive-displacement machine includes a hollow housing provided with two diametrically opposed bores each having a first end communicating with an interior of the housing and a second end closed by a cover. A rotor member is adjustably displaceable in the interior of the housing due to displacement of two pistons positioned in the bores. The pistons are connected to a high pressure chamber, to thereby create in the pistons pressure sufficient to move the latter, to thereby move the rotor member. The housing is provided with control devices to change the pressure in the bores and create a pressure differential in the bores sufficient to move the rotor member into a predetermined position.
April 10, 1978
Date of Patent:
January 29, 1980
Robert Bosch GmbH
Gerhard Nonnenmacher, Walter Robeller, Karl Veil, Roland Steimann
Abstract: A fuel injection pumping apparatus includes a rotary distributor in which is formed a pair of transversely extending bores having their axes intersecting at the axis of rotation of the distributor member and lying in the radial plane passing through the point of intersection. Each bore accommodates a pair of plungers and the plungers of one of said pair define recesses which receive the inner ends of the plungers of the other pair. In this manner the plungers can be moved inwardly a greater extent before collision of the plungers takes place.
Abstract: A fuel pumping apparatus includes a roller which co-operates with cam lobes formed on the internal periphery of the cam ring to effect inward movement of a pumping plunger. The maximum outward movement of the pumping plunger is determined by stop members positioned to engage with the opposite ends of the roller. One of the stop members comprises a continuous ring having a contoured in a surface but the other stop member comprises a plurality of links which are pivotally mounted and the setting of which can be varied to determine the maximum effective outward movement of the plunger and thereby the maximum amount of fuel which can be supplied.
Abstract: A fuel injection pumping apparatus includes an injection pump to which fuel is supplied from a feed pump under the control of throttle means. A component of the injection pump is adjustable by the application of fluid pressure to a piston. The fluid pressure is derived by way of a fixed orifice the downstream of which is connected to a cylinder containing the piston, the downstream side of the orifice being connected to a drain by way of a second fixed orifice and a variable orifice is provided which is adjustable with the throttle means and which determines the pressure applied to the piston.
Abstract: A pump has a rotatable rotor carrying a plurality of radially-extending pistons bearing at their outer ends on an annular adjustment ring which can be displaced radially in the pump housing by means of a pair of diametrically opposed adjustment cylinders that serve to displace this ring and adjust the stroke of the radial pistons in the rotor. One of the adjustment pistons is of larger diameter than the other and both of the adjustment pistons are spring-biased against the outer periphery of the adjustment ring and both have throughgoing bores so that pressure behind these adjustment pistons is fed to pressure-relief pockets at their inner ends against the adjustment ring. The small-diameter piston is provided in its through-going passage with a pressure-limiting valve which only allows pressure past to its respective pressure-relief pocket when pressure behind the smaller piston exceeds a predetermined minimum which is approximately a tenth of the maximum pump operating pressure.
Abstract: A fuel pumping apparatus includes an annular cam having cam lobes which urge a pumping plunger in an inward direction through a roller during an injection stroke. A feed pump supplies fuel by way of a throttle to a bore containing the plunger during a filling stroke and a pair of ring members limit the outward movement of the roller and thereby control the maximum fuel. The ring members can be moved axially away from each other to allow an extra amount of fuel to be supplied for starting purposes.
Abstract: A swash plate radial piston compressor having a toggle action connection means between the swash plate and pistons wherein each piston makes two reciprocations in its cylinder for each 360.degree. of rotation of the compressor input shaft. Means are provided for varying the angle of the swash plate such that a nutating ring, which encircles the swash plate in journaled fashion around the periphery of the swash plate will vary the length of the stroke of the pistons upon a change in the angular position of the swash plate causing a change of volume displacement of the compressor without changing the head clearance of the radial pistons, thus allowing the compressor to go to zero displacement while the input shaft continues to rotate.
Abstract: A fuel injection pump having a cam and pump plungers movable relative to the cam to translate the contour of the cam into a sequence of pumping strokes is disclosed. An advance piston connected to the cam to adjust the timing of the pumping strokes is controlled by a hydraulic pressure which increases with engine speed. The advance piston mounts two control pistons one of which controls the delivery of hydraulic pressure to the advance piston after a predetermined engine speed is reached and the other bypasses the first to control the delivery of the hydraulic pressure during starting and until a lower engine speed is reached.
Abstract: In a fuel injection pump having a cam and pump plungers movable relative to the cam to translate the contour of the cam into a sequence of pumping strokes. An advance piston connected to the cam to adjust the timing of the pumping strokes is controlled by a hydraulic pressure which increases with engine speed. The advance piston mounts a servo valve having a preloaded biasing spring to prevent the delivery of hydraulic pressure to act on said advance piston until a predetermined speed is reached. A movable stop controls the maximum retard position of the advance piston and responds to the hydraulic pressure which is continuously applied to the movable stop and acts to advance the timing a fixed amount as soon as the engine fires. A load sensing piston actuated by a load related source of fluid pressure is operatively connected to the other end of the advance piston to urge the advance piston in a direction to retard the timing of the pumping stroke in response to increased engine load.
Abstract: A hydraulic control device for protecting a drive from excess loading conditions includes at least one pump having adjustable members for controlling the quantity of fluid transported by the pump. A pressure-responsive control slide is mounted for movement relative to a housing and is moved towards respective positions, each of which corresponds to a normally loaded condition of the drive by a control pump which generates a pressure force which is indicative of the rpm of the drive at normally loaded conditions. The device further includes an arrangement for securing the control slide when the drive is subjected to loads in excess of the respective normally loaded conditions so that a valve member is permitted to move in response to excess loads relative to the control slide after the latter has been secured in said respective positions by the securing arrangement between switching positions in which the adjustable members are operative to adjust the quantity of fluid being transported by the pump.
Abstract: The hydraulic controller is for controlling the operation of a plurality of hydraulically controlled devices. Hydraulic fluid may be selectively distributed by the controller to various controlled hydraulic devices in a timed and predetermined sequence. The timing of the distribution of hydraulic fluid by the controller can be quickly and easily varied by various control knobs on the controller to thereby vary the timed operated period of the various machine operations controlled by such devices without affecting the timed operation of other machine operations. The controller is supplied with a source of hydraulic fluid under a generally constant pressure. Cam means are associated with each of a plurality of fluid flow distributing valves for operating such associated valve members in a predetermined sequence of valve positions upon advancement of the cam means relative thereto.