Abstract: A pivot joint for a robot, including a double-acting pneumatic pivot actuator, which has a first working chamber with a first working port and a second working chamber with a second working port, and further including a valve arrangement having a first valve group for a selective connection of the first working port to one of a pressurization port and an exhaust port, and having a second valve group for a selective connection of the second working port to one of the pressurization port and the exhaust port. The valve arrangement includes a safety valve which is connected to the first working port and to the second working port and which is configured for blocking a connection between the first working port and the second working port in a blocking position and for releasing the connection between the first working port and the second working port in a release position.

Abstract: A hydraulic system for a working machine includes a variable displacement hydraulic pump, a plurality of hydraulic actuators, and a plurality of control valves. Each of the control valves includes an input port, an output port, and a flowrate reduction section. At least one of the control valves includes a flowrate increase section. The hydraulic actuators are a boom cylinder, a working tool cylinder, and an auxiliary actuator. The control valves are a boom control valve for controlling the boom cylinder, a working tool control valve for controlling the working tool cylinder, and a first auxiliary control valve for controlling the auxiliary actuator. The boom control valve and the working tool control valve each include the flowrate reduction section, and the first auxiliary control valve includes the flowrate reduction section and the flowrate increase section.

Abstract: Disclosed here is a system and method to control multiple eversion-based actuators using a single motor, or no motor, thereby reducing the size and cost of the multiple eversion-based actuators. An activation mechanism can include a motor rotating in an expansion direction, rotating shaft, clutch, brake, pressure source under high pressure, and/or valve. The activation mechanism can cause the actuators including a wound reel of material to unwind and lengthen. A retraction mechanism can include a motor rotating in a contraction direction opposite the expansion direction, rotating shaft, clutch, pressure source having low pressure, valve associated with the pressure source, and/or the passive retraction system. The retraction mechanism can cause the actuators to rewind and shorten.

Abstract: A valve arrangement structure of a control valve unit includes a control valve body to which oil is supplied from a main pump. The valve arrangement structure includes a pressure regulator valve that is arranged in the control valve body and regulates a pressure of discharged oil from the main pump to a line pressure, a pressure control valve that is arranged in the control valve body and regulates the pressure of the oil to a required pressure with the line pressure as a source pressure, and a first oil passage that is provided in the control valve body and connects the main pump and the pressure regulator valve. The pressure control valve is arranged on a second oil passage branched from the first oil passage.

Abstract: A hydraulic machine includes an actuator, a tank, a directional control valve disposed between the actuator and the tank, and an adjustable return check valve disposed between the directional control valve and the tank. The directional control valve includes an attachment actuator directional control valve disposed between an attachment actuator of the actuator and the tank and a swing actuator directional control valve disposed between a swing actuator of the actuator and the tank. The adjustable return check valve allows fluid to flow from the attachment actuator directional control valve toward the tank while applying the low back pressure but blocks a flow, and allows fluid to flow from the swing actuator directional control valve toward the tank while applying the high back pressure but blocks a reverse flow.

Abstract: A working machine includes a machine body, a left traveling device located left on the machine body, a right traveling device located right on the machine body, and a controller configured or programmed to perform automatic deceleration to automatically reduce a first rotation speed of a left traveling motor and a second rotation speed of a right traveling motor by shifting a speed stage of each of the left and right traveling motors from a second speed stage to a first speed stage that is lower than the second speed stage. The controller is configured or programmed to: not perform the automatic deceleration when the first rotation speed or the second rotation speed is equal to or higher than a predetermined rotation speed; and perform the automatic deceleration when the first rotation speed and the second rotation speed are less than the predetermined rotation speed.

Abstract: The invention relates to an continuously variable locking system for a cylinder-piston arrangement having a cylinder, which has a cap and a base, a piston, which is arranged displaceably in the cylinder and has at least one annular piston seal arranged on the outer surface in the circumferential direction, on which piston a piston rod is arranged, which can be pushed at least partially out axially at the cap end of the cylinder, a closing part, which is continuously variable between an open and a closed position, and a fluid disposed in the cylinder. The object of the invention is to develop the locking system such that the system is characterized by a robust and simple construction, is particularly simple to maintain and adapt, while at the same time being highly reliable and precise in operation.

Abstract: A method for preventing prime mover stall for a work machine including a hydraulic system having a plurality of control valves served by a hydraulic pump. The method can include determining an actual required flow rate value for the plurality control valves and a total maximum flow rate to the plurality of control valves that will enable the prime mover to operate without stalling. The method can also include operating the plurality of control valves such that the combined total flow of the plurality control valves is at or below the total maximum flow rate such that the pump operates at a condition below which prime mover stall will occur. The method can also include setting a flow sharing allocated specific criteria in which the flow reduction takes place during a flow saturation condition for each of the plurality of control valves such that the total sum of the flow rates (calculated based on the criteria) is equal to or less than the total maximum flow rate.

Abstract: The method according to the invention relates to the storage of energy in the form of a compressed fluid which is pumped into a container (2) arranged below a water surface (4) to store the energy, wherein the fluid entering the container displaces an existing content, comprising water, from the container and into the surrounding water, and compressed fluid is removed from the container (2) to remove energy, wherein surrounding water flows back into the container according to the volume of the removed, compressed fluid, characterized in that the container (2) is provided with flexible walls at least in some parts and is arranged on a seabed (6) or lake bed (6) and there is covered by ballast (15) such that it is pressed against the substrate even when completely filled with compressed fluid.

Abstract: Machine to recover a cable, comprising at least one hydraulic pump with variable cubic capacity, provided with a system to adjust the cubic capacity, driven by a servo controller, and at least one hydraulic motor fed by said hydraulic pump by means of at least one pipe to deliver a fluid and at least one pipe to return the fluid.

Abstract: An embodiment of the present invention relates to construction machinery comprising: a first hydraulic pressure line which is connected to a main control valve and one side of a swing motor; a first valve arranged on the first hydraulic pressure line; a first pressure detection member which detects the pressure of the hydraulic oil passing through the first hydraulic pressure line between the first valve and the main control valve; a fourth pressure detection member which detects the pressure of the hydraulic oil passing through the first hydraulic pressure line between the swing motor and the first valve; and a control unit which calculates the flow rate of the hydraulic oil discharged from the swing motor on the basis of the pressure of the hydraulic oil detected by the first pressure detection member and the pressure of the hydraulic oil detected by the fourth pressure detection member.

Abstract: A hydraulic system for a vehicle includes a first hydraulic pump including a first displacement actuator and a first pressure port, a first load sense system fluidly coupled to the first displacement actuator, a second hydraulic pump including a second displacement actuator and a second pressure port, a second load sense system fluidly coupled to the second displacement actuator, and a crossover pressure controller coupled between the first pressure port and the second pressure port. The crossover pressure controller reconfigurable between (a) a combined pressure configuration providing fluid communication between the first pressure port and the second pressure port and (b) a separate pressure configuration inhibiting fluid communication between the first pressure port and the second pressure port. The crossover pressure controller is actuatable independent of the first load sense system and the second load sense system.

Abstract: A working machine includes a prime mover, a traveling device, a traveling motor, a traveling pump, a circulation fluid passage, a traveling switching valve shiftable between a first state corresponding to a first speed of a hydraulic motor and a second state corresponding to a second speed of the hydraulic motor, a brake, an actuation valve configured to output the hydraulic pressure applied to the traveling pump, and change the hydraulic pressure output therefrom, and a controller configured or programmed to control the traveling switching valve, the brake and the actuation valve, and being capable of activating a first mode. The controller is configured or programmed to, when activating the first mode, shift the brake into a braking state, shift the traveling switching valve into the second state, and control the actuation valve so as to set the hydraulic pressure output from the actuation valve to a predetermined pressure.

Abstract: A mount plate for removably connecting a fluid end of a reciprocating pump to a power end for a reciprocating pump includes a first set of openings and a second set of openings, each of which extend through the main body. The first set of openings are configured to receive a first set of couplers that couple the mount plate to a front of the power end. The second set of openings are configured to receive a second set of couplers that couple the mount plate to a fluid end in a spaced relationship. The mount plate may also include a third set of openings that extend through the main body and are configured to receive pony rods of the power end.

Abstract: A mount plate for removably connecting a fluid end of a reciprocating pump to a power end for a reciprocating pump includes a first set of openings and a second set of openings, each of which extend through the main body. The first set of openings are configured to receive a first set of couplers that couple the mount plate to a front of the power end. The second set of openings are configured to receive a second set of couplers that couple the mount plate to a fluid end in a spaced relationship. The mount plate may also include a third set of openings that extend through the main body and are configured to receive pony rods of the power end.

Abstract: An inflatable includes an inflation chamber. The inflation chamber has an outer surface, a first end, and a second end substantially opposite the first end. The inflation chamber is configured to be inflated from a deflated state to an inflated state. The inflation chamber is loadable and bendable in the inflated state. The inflatable also includes a reinforcement. The reinforcement has reinforcement sections corresponding to high-stress regions of the outer surface when the inflation chamber is in the inflated state. The reinforcement is attached to the outer surface and is configured to improve at least one of a loading strength and a bending capability of the inflation chamber when the reinforcement sections are placed on the high-stress regions of the outer surface. The reinforcement is shaped according to a Turing pattern that is based on the high-stress regions of the outer surface.

Abstract: An air motor assembly includes an exhaust block with an exhaust port that conveys exhaust air into an exhaust manifold. The exhaust port includes an expansion chamber that creates a pressure drop in the exhaust gas, thereby decreasing the temperature of the exhaust gas. The expansion chamber is defined between a first wall that is tangential to the air motor cylinder and a second wall that is transverse to an axis of the exhaust port. Poppet valves control actuation of a shuttle. The poppet valves are disposed on the exterior of the air motor assembly and are thermally insulated from the air motor assembly.

Abstract: A vehicle includes: a prime mover; a hydraulic fluid manifold; a hydraulic machine; a hydraulic accumulator; one or more hydraulic actuators; a valve arrangement; and a controller. The controller is configured to receive an actuator demand signal indicative of a demand to move the one or more hydraulic actuators; and to control the hydraulic machine and the valve arrangement to cause movement of the one or more actuators in accordance with the actuator demand signal by bringing the hydraulic accumulator into fluid communication with a first actuator chamber of the one or more hydraulic actuators, and to synchronise therewith changing a pressure in a second actuator chamber of the one or more hydraulic actuators. The second actuator chamber is in fluid communication with the hydraulic machine.

Abstract: A work machine includes a second pilot line that introduces a hydraulic fluid from a pilot hydraulic fluid source to a pilot valve bypassing a first gate lock valve, a second gate lock valve that is disposed on the second pilot line and that is configured to be switched to an open position for allowing the supply of the hydraulic fluid to the pilot valve or a closed position for interrupting the supply of the hydraulic fluid, and a controller that controls the second gate lock valve on the basis of a second remote operation signal transmitted from a remote operation apparatus and that controls the pilot valve according to a first remote operation signal transmitted from the remote operation apparatus. In a state where the first gate lock valve is at a closed position, the second gate lock valve is allowed to be controlled by the controller when stairs are in a retracted state, and is kept at the closed position irrespective of the second remote operation signal when the stairs are in an extended state.

Abstract: An object of the invention of the present application is to provide a hydraulic system that is capable of causing a control pressure outputted from a solenoid valve to follow a control request value quickly at the time the solenoid valve starts to be driven.