Abstract: A hybrid power source includes an electric power source, a first hydraulic pump powered by the electric power source, a hydrocarbon burning power source, and a second hydraulic pump powered by the hydrocarbon burning power source. A hydraulic fluid output is fed by a combined output from the first hydraulic pump and the second hydraulic pump. A controller is provided for dynamically calculating hydraulic fluid requirements at the hydraulic fluid output as work is performed. The hydraulic fluid requirements are primarily provided by the first hydraulic pump powered by the electric power source and supplemented, as directed by the controller, by the second hydraulic pump powered by the hydrocarbon burning power source.

Abstract: A pump apparatus for use on a vehicle or industrial application having a housing in which an end cap is disposed. Multiple hydraulic pumps driven by a prime mover are mounted on the end cap and connected to hydraulic ports formed in the end cap. An auxiliary pump may be drivingly coupled to the prime mover and a power take off unit may also be connected thereto. The end cap may further include a charge pump mounting surface and a charge port for connecting a charge pump.

Abstract: Second-gear blocking switching valves 101 to 104 are provided in pipe lines providing communication between remote control valves 22, 24 and pilot operation portions of valve sections of second-gear spools of control valves. A switching selection means 105 switches the second-gear blocking switching valves 101 to 104. Proportional pressure reduction valves 111 to 114 change secondary pressure to be outputted in accordance with secondary pressure of the remote control valves. Secondary pressure changing switching valves 116 to 119 are provided in pipe lines providing communication between the remote control valves and pilot operation portions of valve sections of first-gear spools of the control valves.

Abstract: Disclosed is a hydraulic system for a construction machine, which makes it possible to adjust the geometric position of a working device comprising a boom and an arm by means of a single manipulation lever, thereby enabling a leveling/flattening process to be conveniently performed. The hydraulic system includes: a working mode selection switch for selecting a leveling/flattening process; a boom driving switch valve for controlling the driving of a boom cylinder in response to a control signal from a first manipulation lever; an arm driving switch valve for controlling the driving of an arm cylinder in response to a control signal from a second manipulation lever; a shuttle valve including input parts that connect to both an electronic proportional control valve and to the first manipulation lever, respectively, and an output part connecting to the boom driving switch valve; and an electronic controller.

Abstract: A fixed/variable hybrid system has modified constant flow open center hydraulic valves (“fixed/variable valves”), including an open center core, spools, a power core, and a tank galley. A small fixed displacement pump provides fluid at a constant rate to the open center core. A variable displacement piston pump provides fluid directly to the power core as needed. Activation of spools partially restricts the open center core causing an increase in fluid pressure that is communicated to the variable displacement piston pump's load sense signal port, causing the pump to increase fluid flow and pressure to the power core. Activated spools direct pressurized fluid from the power core to the applications through selected hydraulic ports. Activated spools also direct fluid flow from selected hydraulic ports via the tank galley to a hydraulic tank. Pumping the majority of fluid only on an as-needed basis results in significant efficiencies.

Abstract: A device for a vehicle or a production machine, having: a first hydraulic pump, which hydraulically drives a load; an internal combustion engine, which mechanically drives the first hydraulic pump; a second hydraulic pump, which is hydraulically coupled to the first hydraulic pump; an apparatus, which drives the second hydraulic pump while utilizing the energy in the exhaust gas stream of the internal combustion engine; the load on the output side being directly connected to a tank.

Abstract: A hydraulic module includes a pump housing with an opening in communication with an exterior surface of the pump housing. A plurality of pump chambers are in communication with the opening. A plurality of pump elements correspond to the plurality of pump chambers, each of the plurality of pump elements being movable within the respective one of the pump chambers to increase the pressure in a fluid from a suction side of the pump chamber to a pressure side of the pump chamber. A motor has an output member extending into the opening of the pump housing and coupled with the plurality of pump elements. A channel is formed in the exterior surface of the pump housing. The channel establishes fluid communication between the plurality of pump chambers.

Abstract: A system and method for operating a two-stage, high-pressure pumping system includes a low-pressure pump having an output configured to deliver a hydraulic fluid under a low-pressure at a high-volume to drive a tool associated with the two-stage, high-pressure, pumping system under low load conditions. The system also includes a high-pressure pump having an output configured to deliver the hydraulic fluid under a high-pressure at a low-volume to drive the tool under high load conditions. A pilot-operated device is included that is configured to selectively drive the tool with pressure from at least one of the output of the low-pressure pump and the output of the high-pressure pump. The pilot-operated device receives pilot pressure from the output of the low-pressure pump to control selectively driving the tool with the output of the two stage pump.

Abstract: A hydraulic control system and a hydraulic control method are disclosed. The hydraulic control system comprises a first closed pump (P1) and a first engine (M1) connected with each other, a second closed pump (P2) and a second engine (M2) connected with each other, and a hydraulic motor (P3). The first closed pump (P1), the second closed pump (P2) and the hydraulic motor (P3) are connected in parallel. Compared with the prior art, the present hydraulic control system has advantages of wider engine model selection range, higher reliability and better micro-motion performance.

Abstract: A hydraulic system with an improved complex operation is provided, which can prevent the generation of shock in a boom by delaying pressure supply during start and end of pilot signal pressure supplied to a spool for controlling an option device when a boom ascending operation and an operation of an option device are simultaneously performed or when such a simultaneous operation of the boom and the option device switches over to an independent operation of the boom.

Abstract: In open-circuit hydraulic systems (1), the cross-sections of the supply lines (6) and input valves of the hydraulic pump (3) have to be large, so that sufficient flow flux can be provided. This hinders a reduction of the size of the pump and the whole hydraulic system. It is suggested that the supply flow (7) of a hydraulic pump (3) is charged by a second, charging pump (2), to a mid-pressure level (7). The cross-sections of the supply flow areas can thus be decreased.

Abstract: An improved vacuum material handler having an onboard drive engine powering a vacuum pump and a hydraulic pump. The vacuum material handler also having a frame with integrated forklift lugs.

Abstract: Disclosed are hydraulic pump systems and pump suction charging systems which reduce or eliminate cavitation in the systems, as well as methods of operating the same and work machines including the same.

Abstract: A hybrid power distribution system for an aircraft generates hydraulic power from one of a plurality of power sources based on which power source provides energy most efficiently. Power sources includes an electric power distribution bus that distributes electrical energy onboard the aircraft, a pneumatic distribution channel that distributes pneumatic energy onboard the aircraft, and mechanical power provided by one or more engines associated with the aircraft.

Abstract: A working machine including an internal combustion engine for supplying torque to the driving wheels of the working machine, and a transmission line arranged between the internal combustion engine and the driving wheels for transmitting torque from the internal combustion engine to the driving wheels. The working machine further including at least one hydraulic pump in a hydraulic system for moving an implement arranged on the working machine and/or steering the working machine. The transmission line includes at least one electric machine for driving or braking the driving wheels, and/or for generating electric power for the at least one hydraulic pump.

Abstract: A hydraulic two-circuit system (2, 4) for activating consumers (A1, B1; A2, B2; A3, B3) of a mobile unit, for example a track-laying unit, and an interconnecting valve arrangement (38), which is suitable for a two-circuit system (2, 4) of this type and via which the two circuits (2, 4) can be interconnected so as to add them together, are disclosed. According to the invention, the interconnecting valve arrangement has an interconnecting valve with two pressure connections (P1, P2), two LS input connections (LS1, LS2) and two LS output connections, wherein a valve body of the interconnecting valve is designed with four control surfaces, of which two control surfaces which act in one direction are acted upon by the highest load pressure (LS1) in the first circuit and by the pumping pressure (P2) in the second circuit, and the control surfaces acting in the other direction are acted upon by the highest load pressure (LS2) in the second circuit and by the pumping pressure (P1) in the first circuit.

Abstract: A hydraulic circuit is disclosed. The hydraulic circuit may have a pump, a motor, a tank, and an accumulator. The hydraulic circuit may also have a valve movable between a first position at which an output of the pump is fluidly connected to the tank and the accumulator is fluidly connected to the motor, and a second position at which the output of the pump is fluidly connected to the motor.

Abstract: Engine-driven hydraulic pump for an aircraft, having a first and a second pump unit which each comprise an adjustable swash plate and a piston assembly coupled with said swash plate and driven by a pump shaft, a control device for adjusting the inclination of the swash plate and a drive shaft via which the hydraulic pump can be driven by an engine of the aircraft while generating hydraulic pressure at an outlet line, characterized in that the pump units are arranged in parallel and have a respective pump shaft, which pump shafts are coupled with the drive shaft by a gear unit.

Abstract: The invention relates to a method and to a working equipment for actuating a hydraulically movable working element (24), which is provided on a main body (14) of a working equipment (11), comprising at least one main cylinder (19) and at least one additional cylinder (28), which are supplied with pressure medium to generate a pivoting movement, wherein the pivoting movement in the rapid motion mode is actuated in a first working pressure range of the hydraulic control device (32), the pivoting movement in a working motion mode is actuated in a second working pressure range, which is higher than the first working pressure range, the pivoting movement in the heavy load motion mode is actuated in a third working pressure range, which is higher than the first and second working pressure ranges, and the pivoting movement of the working element (24) in the operating modes of rapid motion, working motion or heavy load motion is actuated in accordance with the prevailing working pressure. (See FIG. 1b).

Abstract: A drive apparatus for a zero turn vehicle or similar application comprising a housing forming a cavity and having an input shaft driving a continuously variable transmission comprising first and second rotatable elements and output shaft is driven by the second rotatable element.

Abstract: A system includes a high pressure accumulator; a low pressure reservoir; and a plurality of pumps configured to control the flow of fluid between the high pressure accumulator and the low pressure reservoir, a battery; an electric motor powered by the battery; a management unit in communication with the electric motor and the plurality of pumps.

Abstract: A transmission of a motor vehicle includes: an input shaft and an output shaft; at least one hydraulically operable actuator, hydraulic lubrication and/or oil cooling; a first hydraulic pump which is driven directly or indirectly by the input shaft; and a second hydraulic pump which is driven directly or indirectly by the output shaft.

Abstract: A dual pump apparatus having two pumps mounted in a housing, where the housing comprises two elements mounted on opposite sides of a hydraulic mounting member or center section. The pumps are mounted on one side of the hydraulic mounting member in a pump cavity, and the hydraulic mounting member and second housing element form a drive cavity in which gears or an endless coupling member such as a chain or belt to connect the two pump input shafts are located.

Abstract: A drive apparatus includes a pair of axial piston pump assemblies in an inline relationship, each pump assembly having an end cap mounted to a pump housing to form a sump. The pump assemblies are mounted to a gearbox at one end thereof, and an input shaft extends into both pump housings and the gearbox to drive the axial piston pumps and one of the gears. A power take off mechanism is also engaged to the gearbox at another end thereof and includes a drive shaft at least partially disposed in the gearbox and driven by one of the transmission gears, and an output shaft extending in the opposite direction from the drive shaft.

Abstract: A hybrid-type construction machine comprises an engine 11; an electric power accumulator 19B; first and second pumps 28, 14; a motor generator 27 for driving the first pump 28; and plural actuators 1A, 1B, 7, 8 and 9 which are driven by the first and second pumps 28, 14, wherein the first and second pumps 28, 14 are arranged such that the first pump 28 controls at least one of the actuators 1A, 1B, 7, 8 and 9 independently from the second pump 14 and the second pump 14 controls at least another one of the actuators 1A, 1B, 7, 8 and 9 independently from the first pump 28, the first pump 28 is electrically driven by the motor generator 27 with electric power from the electric power accumulator 19B, and the second pump 14 is directly coupled to the engine 11.

Abstract: The present invention relates to a hydrostatic transmission closed circuit comprising a fluid tank (50), a hydraulic pump (12; 212), a first engine assembly (20; 220) and a second engine assembly (30, 40; 230), said first and second engine assemblies (30, 40; 230), each comprising at least one hydraulic engine, a booster pump (14; 214), an exchange unit (60; 260), said circuit being characterised in that it also comprises a supplementary boosting line (150; 350) which removes fluid at the outlet of the exchange unit (60; 260) and boosts the hydrostatic transmission circuit at the level of the series line (104; 204).

Abstract: A module for use in connection with a dual pump apparatus, where each pump is hydraulically connected to a separate hydraulic motor. The module may include motors and/or an engine for ease of installation in a vehicle, providing flexibility for different applications. Various brackets, stabilizers and other elements are provided to assist in securing the module to the vehicle.

Abstract: A regenerative hydraulic pump that allows for efficient operation of a hydraulic system under high pressure/low flow conditions that comprises a crankshaft providing a rotating inertial mass, and a regenerative hydraulic pump cylinder that comprises a pump cylinder housing, a pump piston mechanically connected to the crankshaft; and a compliant pressure chamber that stores a portion of the energy extracted by the pump piston during a pumping stroke for release back to the pump piston and to the crankshaft during a regenerative back stroke.

Abstract: When controlling each operational process in a molding cycle by variably controlling the number of revolutions of a drive motor 3 in a hydraulic pump 2, a hydraulic pump 2 where at least multiple fixed discharge flow rate Qo and Qs can be set is used as the hydraulic pump 2. At the same time, the fixed discharge flow rates Qo . . . are set corresponding to operational processes based upon predetermined conditions in advance, respectively, and the hydraulic pump 2 is switched to the fixed discharge flow rates Qo . . . by corresponding to each operational process at the time of molding. At the same time, each operational process is controlled by variably controlling the number of revolutions of the drive motor 3.

Abstract: The procedure, provides a simple and retro-fittable manner to align working equipment, mounted to a liftable and lowerable hoisting frame of a working machine in a tilting way to comply with required positions, wherein the working equipment is shifted via a tilting cylinder in other directions than the hoisting framing. The tilting cylinder is supplied with hydraulic oil from a hydraulic pump for the working hydraulic system by a direct-operated control valve, and secondary consumers of the working machine being supplied with hydraulic oil from at least one other hydraulic pump. Once the driver operates a triggering element, the two hydraulic connections of the tilting cylinder are also connected to the hydraulic pump for the secondary consumers by a switch-over valve activated by the control equipment, therefore shifting the tilting cylinder in the direction of the neutral position of the working equipment.

Abstract: A hydraulic system and earth-moving vehicle employing the hydraulic system are disclosed. The hydraulic system may include a first hydraulic cylinder and a second hydraulic cylinder, first and second hydraulic pumps and control valves to modulate provision of hydraulic fluid and pressure from the first and second hydraulic pumps to the first and second hydraulic cylinders as appropriate for the task being performed. If the task is digging with the earth moving vehicle, the first and second cylinders may be associated with tilting and lifting, respectively, and the control valves may be oriented so as to make each pump dedicated to one of the cylinders, and if demand is not being met, to then diminish power to the drivetrain to allow the tilting and lifting to be performed. The combiner may or may not be open during this time. If the task is not digging, a combiner valve can be opened to allow for cross-flow between the pumps and the cylinders.

Abstract: A semi-closed hydraulic system for use with heavy equipment includes a double-acting cylinder, a reservoir, first and second electric motors, first and second electric pumps, a pressure sensor, and a controller. The double-acting cylinder has a rod end and a cap end, and the reservoir is designed to provide hydraulic fluid to and receive hydraulic fluid from the cap end of the double-acting cylinder. The first pump is connected to and designed to be driven by the first electric motor. Furthermore, the first pump is bi-directional and is intermediate to the rod end and the cap end of the double-acting cylinder, such that the first pump is designed to provide hydraulic fluid to the rod end from the cap end, and to the cap end from the rod end. In addition, the second pump is coupled to and designed to be driven by the second electric motor, where the second pump is intermediate to the cap end of the double-acting cylinder and the reservoir.

Abstract: A pump apparatus for use on a vehicle or industrial application having a housing in which an end cap is disposed. Multiple hydraulic pumps driven by a prime mover are mounted on the end cap and connected to hydraulic ports formed in the end cap. An auxiliary pump may be drivingly coupled to the prime mover and a power take off unit may also be connected thereto. The end cap may further include a charge pump mounting surface and a charge port for connecting a charge pump.

Abstract: A universal control scheme for mobile hydraulic equipment has switches to activate and/or control any number of different tools or accessories that may be used to configure the equipment. Additionally, a single controller command may be reassigned from one set to another set of hydraulic line pairs. Furthermore, at different times, two separate controller commands may be used to control the same hydraulic line pair. The control scheme also provides for consolidating hydraulic line pair functions to separate for dedicated use those line pairs associated with operating hydraulic cylinders to extend or retract a member and those line pairs used to provide hydraulic fluid for operating tools.

Abstract: A hydraulic system for use in a work vehicle with a powered implement is disclosed. In one embodiment, the hydraulic system may include a first hydraulic circuit including a first hydraulic pump with a low pressure and low flow output, switch and valve; a second hydraulic circuit including a second hydraulic pump with a high flow and high pressure output, switch and valve; and a third hydraulic circuit including a third hydraulic pump with a high flow and high pressure output, switch and valve. The first, second, and third circuits each include an output selectively combinable with each other by an operator control which controls the switch and valve configurations. The hydraulic system has several configurations.

Abstract: A fixed displacement binary pump is provided for a powertrain on a vehicle. A hydraulic system is operatively connected with first and second discharge ports of the pump and is operable to alternately permit fluid flow through both discharge ports (i.e., full displacement or volumetric output of the pump) or permit flow through only the first discharge port (i.e., partial displacement or volumetric output of the pump). The pump may be packaged in a front support of the transmission. An auxiliary pump may be provided that is operable to supplement the output of the binary pump or to be used when the binary pump is off. A method of operating the binary pump and auxiliary pump is provided.

Abstract: A hydrostatic drive with first and second hydraulic pumps and a dual-acting hydraulic cylinder. The dual-acting hydraulic cylinder has a first working chamber defined by a first piston surface and a second working chamber defined by a second piston surface. The first working chamber is connected to first connections of the first and second hydraulic pumps. The second working chamber is connected to a second connection of the second hydraulic pump. A second connection of the first hydraulic pump is connected to a hydraulic fluid reservoir. The ratio of the first piston surface to the second piston surface differs from the ratio of the total delivery volume of the two hydraulic pumps relative to the delivery volume of the second hydraulic pump. A tapping valve for removing hydraulic fluid is provided for the volumetric flow equalisation.

Abstract: The invention relates to a catapult drive for an object to be accelerated, preferably the car of a fairground ride, wherein the object is accelerated by means of a driving element. The movement of the driving element is produced by a flexible drive and a hydraulic cylinder via which all movements of the driving element can be controlled. The invention also relates to a control system for suitably controlling the inventive catapult drive.

Abstract: A hydraulic circuit for heavy equipment is disclosed, which utilizes a hydraulic fluid supplied from a hydraulic pump for driving a cooling fan, as a pilot signal pressure, without installing a separate constant displacement pilot pump for supplying the pilot signal pressure to a control valve for controlling the hydraulic fluid to be supplied to a working device such as a boom.

Abstract: On the basis of reference torque and torque correction amount output units (T1 and T2), a torque control command pressure is calculated so that the input torques of first and second pumps are increased. The calculated torque command instruction pressure is then supplied as external command pressure to the varying mechanism of a regulator used for the first and second pumps so as to prevent the input torques of the first and second pumps from being decreased more than necessary. As a result, even when three variable displacement hydraulic pumps are used with the discharge pressure of one of the hydraulic pumps reduced by a pressure reducing valve and further the input torques of the other two hydraulic pumps are decreased by that pressure, the engine output can be efficiently utilized, and the work rate does not decrease.

Abstract: A universal control scheme for mobile hydraulic equipment has switches to activate and/or control any number of different tools or accessories that may be used to configure the equipment. Additionally, a single controller command may be reassigned from one set to another set of hydraulic line pairs. Furthermore, at different times, two separate controller commands may be used to control the same hydraulic line pair. The subject invention is also directed to a method for achieving the same.

Abstract: A hydraulic system for an agricultural vehicle is proposed. The hydraulic system comprises a main hydraulic circuit, which is fed with hydraulic fluid by a main hydraulic pump, a variable displacement charge pump which supplies charge pressure to the main hydraulic pump, and a lubricating hydraulic circuits. In order to keep efficiency losses on the vehicle to a minimum, particularly at high engine speeds, part of the hydraulic fluid delivered by the charge pump can be diverted to the lubricating hydraulic circuit.

Abstract: In a method of controlling an injection molding machine M which controls specified operational processes in a molding cycle by variably controlling the rotation speed of a driving motor 3 in a hydraulic pump 2 and driving a specified hydraulic actuators 4a, 4b, . . . , in lowering the pressure Pd of the operational process to a specified pressure Pn, the pressure Pd is forcibly lowered by controlling the driving motor 3 in reverse rotation.

Abstract: An arrangement for delivering hydraulic fluid to at least one hydraulic actuator of a work vehicle for moving a work implement and/or steering the vehicle includes at least two pumps which are adapted to be operatively driven by a power source and adapted to operatively drive said at least one hydraulic actuator via hydraulic fluid. A first pump is operated with a phase shift relative to a second pump.

Abstract: A dual pump apparatus for use on a vehicle or industrial application having a housing in which a pair of hydraulic pumps are mounted and driven by a prime mover. The prime mover is drivingly coupled to a main input shaft, which drives the hydraulic pumps. An auxiliary pump may be drivingly coupled to the main drive shaft and a power take off unit may also be connected thereto. The power take off unit may be driven by a power take off unit output drive shaft, on which a cooling fan may be attached.

Abstract: A hydraulic circuit for a construction machine is disclosed, which can prevent an energy loss of a hydraulic system by automatically reducing revolution of an engine when a working device such as a boom is not driven. The hydraulic circuit includes first to third hydraulic pumps, first to third switching valves for controlling hydraulic fluid fed to working devices, a fourth switching valve for controlling hydraulic fluid fed to left and right traveling devices, a confluence switching valve for selectively supply the hydraulic fluid from the third hydraulic pump to either the working devices on the first hydraulic pump side or the working devices on the second hydraulic pump side, a signal line for traveling devices, signal lines for working devices, and a shuttle valve for selecting any one of the signal pressure formed in the signal line for the traveling devices and the signal pressure formed in the signal lines for the working devices.

Abstract: Heavy equipment includes first and second hydraulic pumps, and first and second hydraulic actuators, where the first hydraulic actuator facilitates a first work function of the heavy equipment and the second hydraulic actuator facilitates a second work function of the heavy equipment. The heavy equipment further includes valving and a computerized controller. The valving is configured to allow the first hydraulic pump to be coupled to the first hydraulic actuator and the second hydraulic actuator, and to allow the second hydraulic pump to be coupled to the first hydraulic actuator and the second hydraulic actuator. The computerized controller is coupled to the valving, and has a logic module.

Abstract: A drive apparatus for a zero turn vehicle or similar application comprising a pair of pumps mounted in a common housing and having coaxial input shafts and an input shaft mounted in the common housing perpendicular to the two pump shafts. A pair of center sections or end caps including hydraulic porting are mounted to opposite ends of the common housing, and each center section has a hydraulic motor mounted thereon external to the common housing.

Abstract: When constructing an injection molding machine M that is equipped with hydraulic pumps 2, which control discharge flow rates by variably controlling the number of revolutions of a drive motor 3, and that drives hydraulic actuators 4a . . . by these hydraulic pumps 2; the injection molding machine M is equipped with a hydraulic drive member 6 having multiple hydraulic pumps 2p and 2q, and a hydraulic oil supply circuit 5 jointly or individually supplying hydraulic oil to be discharged from multiple hydraulic pumps 2p and 2q to a hydraulic actuator 4a, 4b, 4c, 4d or 4e selected from the multiple hydraulic actuators 4a . . . .

Abstract: A flow management system capable of providing adjustable hydraulic fluid flow or pressure at a common line to supply bidirectional pumps in electro-hydrostatic actuation systems and conditioning re-circulated hydraulic fluid. The system enables flow sharing between multiple actuation systems and minimization of energy consumption by a power-on-demand approach and/or electrical energy regeneration while eliminating the need for an accumulator. The system has particular application to electro-hydrostatic actuation systems that typically include bi-directional electric motor driven pumps and unbalanced hydraulic actuators connected within closed circuits to provide work output against external loads and reversely recover energy from externally applied loads.