Abstract: A hydraulic system for use in an automotive vehicle. A source of hydraulic pressure selectively operates in two modes. In one mode, it feeds a radiator cooling fan and a power steering system in parallel when a system pressure or flow exceeds a predetermined pressure rate. In another mode, it feeds the radiator cooling fan and the power steering system in series when the system pressure or flow is less than the predetermined pressure or flow.

Abstract: A fluid control system for powering vehicle accessories includes a pump for generating a supply flow of hydraulic fluid, and a supply line for receiving the supply flow of hydraulic fluid. The system further includes a fan control circuit in fluid communication with the supply line, wherein the fan control circuit includes (1) a hydraulic motor and a bypass valve, and (2) the hydraulic motor is positioned in parallel with the bypass valve. The system also includes a steering control circuit in fluid communication with the fan control circuit, wherein (1) the steering control circuit requires a first predetermined flow of hydraulic fluid from the fan control circuit for proper operation thereof, and (2) the bypass valve and the hydraulic motor cooperate so as to create a second predetermined flow of hydraulic fluid. Moreover, the system includes a sensor for detecting operational pressure within the fluid supply line and generating pressure status signals in response thereto.

Abstract: An aerial lift unit is truck mounted. The lift includes a lower boom pivoted to the truck and an upper boom pivotally connected to the outer end of the first boom. A lower boom cylinder unit is connected to pivot and thereby raise and lower the lower boom. A second tandem cylinder unit consists of first and second cylinders with the head end interconnected and having cylinder rods extending coaxially outwardly from the opposite rod ends. The one cylinder rod is connected to the lower boom and the second piston rod is connected to the base of a V-shaped coupling member having one arm pivotally connected to the lower boom and a second arm is pivotally connected to the upper boom. The second cylinder positions the upper boom in a preset orientation with respect to the lower boom. The first cylinder is connected in a hydraulic supply circuit with the lower boom cylinder and with the hydraulic fluid flow serially through the lift cylinder and second cylinder.

Abstract: A self-leveling system controlling a boom (13) and a bucket (15) by double acting cylinders (17, 19). The system includes a self leveling valve assembly (27) including a first valve section (27a) including a flow divider spool (41) whereby flow from the rod end of the boom cylinder (17) is divided, one portion flowing to the head end of the bucket cylinder (19). The valve assembly also includes a second valve section (27b) including a flow dividing spool (61), whereby flow from the head end of the boom cylinder (17) is divided, a portion flowing to the rod end of the bucket cylinder, as the boom (13) is lowered. The self leveling valve assembly (27) includes capability whereby, even when the bucket cylinder (19) is fully extended or fully retracted, it is still possible to operate the boom cylinder (17).

Abstract: A hydraulic motor system minimizes wasted power by using a plurality of fixed displacement hydraulic motors to drive a drive shaft in a cooperative manner. The motors are selectively switched into operation in response to variations in fluid pressure. As a consequence the hydraulic fluid acts upon a motor system having an effective combined displacement for producing a predetermined shaft rotation rate at the volumetric flow rate which caused the pressure condition. The invention is disclosed as having particular utility for driving a cooling fan for an automotive engine.

Abstract: A fluid supply system provides hydraulic fluid to a series combination of an automotive fan motor and a power steering unit. There is a bypass line around the fan motor for prioritizing the operation of the power steering unit. A normally closed pressure sequencing valve opens the bypass line when the pressure across the overall series combination exceeds a predetermined limit. Optional second and third bypass lines are disclosed for respectively bypassing either the power steering unit or the fan motor in case of abnormal conditions therein.

Abstract: A hydraulic motor system minimizes wasted power by using a plurality of fixed displacement hydraulic motors to drive a drive shaft in a cooperative manner. The motors are selectively switched into operation in response to variations in fluid pressure. As a consequence the hydraulic fluid acts upon a motor system having an effective combined displacement for producing a predetermined shaft rotation rate at the volumetric flow rate which caused the pressure condition. The invention is disclosed as having particular utility for driving a cooling fan for an automotive engine.

Abstract: An anti-cavitation hydraulic manifold for hydraulically coupling the hydraulic input and output of two, drive coupled, reversible hydraulic motors to a reversible source of hydraulic power is described which includes: (i) two high pressure hydraulic input/output (I/O) chambers receiving hydraulic input from a reversible hydraulic power source, each hydraulically coupled to a separate input/output (I/O) line of one reversible hydraulic motor; (ii) a common translation passage hydraulically communicating with each high pressure input/output (I/O) chamber and hydraulically establishing a common input/output (I/O) or bypass line for the respective reversible hydraulic motors; (iii) a shuttle ball within each high pressure input/output (I/O) chamber seatable upon a valve seat terminating the end of the translation passage for isolating the common translation passage and bypass line and directing high pressure hydraulic input from the reversible hydraulic power source to the separate input/output (I/O) line for `dr

Abstract: A fluid supply system provides hydraulic fluid to a series combination of an automotive fan motor and a power steering unit. There is a bypass line around the fan motor for prioritizing the operation of the power steering unit. A normally closed pressure sequencing valve opens the bypass line when the pressure across the overall series combination exceeds a predetermined limit. Optional second and third bypass lines are disclosed for respectively bypassing either the power steering unit or the fan motor in case of abnormal conditions therein.

Abstract: Disclosed is a hydraulic system for a machine having a pump, a steering circuit and first and second hydraulic implements, e.g., a hydraulic loader and a backhoe, powered by first and second valve sections, respectively. In the improvement, the system includes a priority valve receiving fluid from the pump and configured for movement between a first position and a second position. In the first position, the priority valve flows fluid to the steering circuit and to the second valve section and in the second position, the priority valve flows fluid to the both valve sections which are connected in series.

Abstract: A hydraulic shoe bolt wrench used to mount and remove shoe bolts which secure shoes to a track chain. The apparatus comprises a vertical cylinder stood upright on a frame moving on a work table, a main frame secured to a piston rod of the vertical cylinder, a wrench socket driving shaft vertically projected below the main frame, a low speed high torque motor and a reduction gear provided on the driving shaft. Pressure oil is supplied to the high speed low torque motor and high pressure oil is supplied to the low speed high torque motor. Switching of the high speed low torque motor to the low speed high torque motor is carried out by a pressure switch disposed in a low pressure hydraulic circuit.

Abstract: Load sensing hydraulic systems conserve energy by generating only the fluid flow demanded by the system and at a pressure only slightly greater than the highest load pressure of the system. Optimizing the operating characteristics of the system for certain applications also caused the variable displacement pump to go to its maximum displacement setting with the excess fluid generated thereby not doing any useful work. The load sensing hydraulic system includes a flow control valve connected to a directional control valve and has an operating position in which fluid exhausted from a hydraulic jack is transmitted therethrough to a tank. A signal valve is disposed in a control pressure signal line for controlling fluid flow therethrough from a supply conduit to one end of the flow control valve. When the signal valve is blocking fluid flow through the signal line, the flow control valve is in the above-noted operating position.

Abstract: In a switching arrangement for the hydraulic drive of a full-track vehicle, in which arrangement at least one drive motor is associated with each respective endless ground-engaging track at both sides of the longitudinal axis of the vehicle, there are provided for the drive motors located at both sides of the longitudinal axis of the vehicle, a common source of pressurized fluid and a valve arrangement by which the drive motors can be connected with the common source of pressurized fluid in series for moving the tracks in the same sense and in parallel for moving the tracks in a mutually opposing sense, and by which each drive motor can, if required, separately be supplied with pressurized fluid.

Abstract: A hydraulically operated rotational drive system, preferably for a Gatling cannon or gun, comprises a first hydraulic motor for the driving phase and sustenance of a predeterminate operating speed as well as for base load operation for the braking phase, and being continually operatively connectable to a second hydraulic auxiliary motor. During the start-up or run-up phase, until attaining the required speed, as well as during the braking or deceleration phase, this second hydraulic motor is operatively and/or controllably, automatically connectable to the first hydraulic motor for energy-saving operation. Operative and controllable connection of the first and second hydraulic motors is accomplished by means of an operative connection of the hydraulic system with the hydraulic motors on the one hand and with a pressure source and a tank on the other hand.

Abstract: A hydraulic feed control system for log debarkers having three infeed and three outfeed rolls. Each roll is driven by its own hydraulic motor. Each infeed motor is connected in series with a corresponding outfeed motor whereby three pairs of motors are defined. The hydraulic fluid is pumped through a three way flow divider which divides the fluid equally to each of these pairs. Each of the motors has a special crossover relief with a directional flow control that will prevent the excessive pressure that may be created by one of the motors in the series from effecting the pressure to the other motors. The special relief is also provided with a direct line into the oil reservoir which if needed either of the motors in series may siphon oil from the reservoir through the directional flow control valve without affecting the other motor. The return line from the outfeed (down flow) motor joins a common return which is separate from the relief return to tank.

Abstract: A pneumatic power tool for tightening screw joints includes a primary motor 11 for a high speed running down sequence, a secondary motor 12 for a high torque final tightening sequence, a coupling gearing 18 providing a high ratio gearing for the secondary motor 12, a gearing of a substantially lower ratio for the primary motor 11 and a one-way clutch 30 by which the secondary motor 12 is automatically engaged at decreasing tightening speed. An air supply valve 33 substantially reduces the air consumption of the tool by keeping the air supply to the secondary motor 12 shut off until a certain degree of tightness in the joint is obtained, after which the valve 33 is opened and the secondary motor 12 is energized.

Abstract: A device in rock or earth drilling apparatus for rotary drilling including an axially stationary chuck (21) and an axially movable chuck (27) which is rotated by a reversible pressure fluid driven rotary motor (32) having a pressure fluid supply conduit for each direction and which is moved forwards and backwards by a reversible pressure fluid driven feed motor (17) having a pressure fluid supply conduit (18, 19) for each direction, the chucks being actuated to withdraw from or insert in a drill hole a drill string (23) composed by a number of threaded string elements and (are also actuated) to make or break the joints between the string elements.

Abstract: Power steering pump is employed to provide power for engine cooling fan drive. Bypass oil or bypass oil in addition to return oil is routed from the power steering gear through the fan drive motor for improved fan drive operation.

Abstract: The hydraulic power system includes a single electrical motor for driving a fluid pump which supplies fluid under pressure to a plurality of series connected fluid motors, with the first motor in the series directly to the pump outlet and the last motor in the series to a fluid reservoir that constitutes the fluid source for the pump. The electrical motor is operable in response to a call for the actuation of any one of said fluid motors, and requires a maximum power output relative to the pump fluid capacity so that the fluid pressure and flow characteristics delivered by the pump satisfy the full load operating requirements of the last fluid motor in the series of motors when all of the other fluid motors are under full load operation.

Abstract: Prior art interrupted series type load sensitive hydraulic systems have not had the capability of both providing full speed simultaneous vehicle cornering and implement correction while preventing the same when the implements are operating at a high pressure level, and preventing low torque motor stall. Herein, an input flow path (22) delivers pressurized fluid flow from a source (12) to a first priority (steering) circuit (14). A series flow path (24) delivers the output flow from the circuit (14) to an implement circuit (16). A parallel flow path (26) delivers a portion of the flow from the source (12) to the implement circuit (16). A valving structure (42) is in the series flow path (24). The valving structure (42) is opened in response to load pressure in the implement circuit (16) being at or below a selected value and is closed in response to the load pressure in the implement circuit being above said value.

Abstract: An energy conversion apparatus and method for the transfer and utilization of kinetic energy received by one or more natural kinetic energy receptors from one or more "natural kinetic energy source" such as for example solar energy, wind energy, water currents and tides, geothermal energy and the like, for powering one or more electricity generating devices. The "natural kinetic energy" is converted into fluid pressure by "receptor(s)" coupled with hydraulic fluid pressure pump(s). Back flow of fluid is prevented from flowing through the non-operating fluid pumps by check valve(s). The fluid pressure is used to operate one or more fluid pressure motors coupled with electricity generating unit(s). When first and second fluid pressure motors are used, means is provided for directing all of the fluid under pressure through the first pressure motor until it is operating at a desired speed before fluid pressure is permitted to operate the second pressure motor.

Abstract: A flow control valve assembly for controlling first and second reversible fluid motors for series or parallel operation has a direction control secton and a torque control section provided in a single valve body. The valve body has first, second, and third supply ports selectively pressurizeable by the direction control section and connected to a torque control bore in the torque control section. First and third function passages extend from the torque control bore and are connectible to the first fluid motor, and second and fourth function passages extend therefrom and are connectible to the second fluid motor. A grooved, torque control spool is disposed in the torque control bore for sliding from a series operating position wherein the grooves connect the first port to the first function passage, the second function passage to the third function passage, and the fourth function passage to the second and third ports.

Abstract: An apparatus such as a farm implement or other mechanical device subject to varying loads and power requirements has an hydraulic circuit which automatically shifts two or more hydraulic motors from a normal series operation at high speed to a parallel operation at reduced speed but higher torque in response to increased fluid pressure upstream of the motors. In a disclosed embodiment, a valve is connected to block flows from the fluid source to inlet of one motor and from outlets of both motors directly to drain under low pressure conditions but to shift to allow two parallel flows to the two motors upon increase in pressure in the flow from the source. A third motor driving an auxiliary device such as a material feed is by-passed in the parallel-flow condition.

Abstract: A cascade drive system is disclosed for use in processes that deal with continuous lengths of material such as film, wire, paper, fabric, etc. The system includes a plurality of stages holding fixed speed ratios to each other; and uses hydraulic components arranged in a series flow circuit, in such a way that the line speed may be synchronously increased or decreased and individual ratios between adjacent stages may be changed.