Abstract: A head unit system for controlling an object includes a head unit device that include shear thickening fluid (STF) and a chamber configured to contain the STF. The chamber further includes a set of gates between a front channel and a back channel. The set of gates includes a bypass opening set. The head unit device further includes a cupped piston housed at least partially radially within the chamber. The set of gates is configured to control flow of the STF between the front channel and the back channel to control rotational movement of the object.

Abstract: A head unit system for controlling an object includes a head unit device that include shear thickening fluid (STF) and a chamber configured to contain the STF. The chamber further includes a set of gates between a front channel and a back channel. The set of gates includes a bypass opening set. The head unit device further includes a cupped piston housed at least partially radially within the chamber. The set of gates is configured to control flow of the STF between the front channel and the back channel to control movement of the object.

Abstract: Disclosed are a reservoir for a brake apparatus of a vehicle. The reservoir includes a first reservoir tank, a second reservoir tank formed to be spaced apart from the first reservoir tank and provided with a port portion for supplying a brake fluid to the first reservoir tank, and a connection hose configured to connect the port portion to the first reservoir tank so that the brake fluid of the second reservoir tank is transferred to the first reservoir tank, wherein the port portion includes a first port unit protruding to the inside of the second reservoir tank and a second port unit protruding to the outside of the second reservoir tank.

Abstract: A pump for use in a hydraulic fracturing system, the pump including a conical packing sleeve including a tapered segment adjacent a pump insertion side a pilot and sealing segment adjacent and contiguous with the tapered segment and an attachment segment adjacent and contiguous with the pilot and sealing segment and adjacent a pump removal side. Methods of installing, removing and replacing the sleeve are also disclosed.

Abstract: Presented herein are systems and methods for attenuating certain pulsations in a hydraulic system comprising a pump and a hydraulic actuator. In certain aspects, an accumulator comprising an internal volume that is divided into a working chamber and a contained chamber may be utilized to at least partially attenuate propagation of certain pulsations in the system. The working chamber may be fluidically coupled to the pump via a first flow path and fluidically coupled to a chamber of the actuator via a second flow path. The system may be designed such that a first inertance of the first flow path is greater than a second inertance of the second flow path. Additionally or alternatively, the system may be designed such that a resonance associated with the first inertance and a compliance of the accumulator may occur at a resonance frequency of less than 90 Hz.

Abstract: A working machine includes: a machine body provided thereon with a traveling pump and a traveling motor; a traveling change-over valve shiftable between a first state where a rotation speed of the traveling motor is set to a first speed and a second state where the rotation speed is set to a second speed; an actuation valve operable to control a flow of operation fluid to an operation valve that changes a pressure of operation fluid to be applied to the traveling pump according to operation of an operation member; and a controller to perform a shock-mitigation control for reducing an opening degree of the actuation valve when the traveling change-over valve is shifted from the first state to the second state. The controller determines a reduction amount of the opening degree of the actuation valve reduced by the shock-mitigation control, based on a straight-traveling degree of the machine body.

Abstract: An electro-hydraulic actuator includes a deformable shell defining an enclosed internal cavity and containing a liquid dielectric, first and second electrodes on first and second sides, respectively, of the enclosed internal cavity. An electrostatic force between the first and second electrodes upon application of a voltage to one of the electrodes draws the electrodes towards each other to displace the liquid dielectric within the enclosed internal cavity. The shell includes active and inactive areas such that the electrostatic forces between the first and second electrodes displaces the liquid dielectric within the enclosed internal cavity from the active area of the shell to the inactive area of the shell. The first and second electrodes, the deformable shell, and the liquid dielectric cooperate to form a self-healing capacitor, and the liquid dielectric is configured for automatically filling breaches in the liquid dielectric resulting from dielectric breakdown.

Abstract: The disclosure relates to a hydraulic control block for controlling a pressure medium supply of a hydraulic cylinder of a hydraulic spindle. The hydraulic control block includes a generic hydraulic switching structure electively configurable in each of a plurality of specific hydraulic switching structures, each of the plurality of specific hydraulic switching structures having a respective hydraulic cylinder with a number of piston areas which differs from a number of piston areas in the respective hydraulic cylinders of each of the other of the plurality of specific hydraulic switching structures.

Abstract: A working machine includes a prime mover, a traveling pump driven by a power of the prime mover to deliver operation fluid, a traveling motor rotated by the operation fluid delivered from the traveling pump to have a rotation speed stage shiftable between a first speed stage and a second speed stage higher than the first speed stage, a traveling switching valve shiftable between a first state where the rotation speed stage of the traveling motor is set to the first speed stage and a second state where the rotation speed stage of the traveling motor is set to the second speed stage, an actuation valve configured to change a pilot pressure of a pilot fluid to control a flow of operation fluid delivered from the traveling pump, and a controller configured to control the pilot pressure of the pilot fluid output from the actuation valve so that a value of the pilot pressure differs depending on whether the set rotation speed stage of the traveling motor is the first speed stage or the second speed stage.

Abstract: A piston assembly that includes a pair of piston members that are formed of compacted powdered metal. The piston members have sets of locking features that include alternating projections and recesses that are spaced circumferentially about and intersect a rod aperture that extends through the piston member. Each projection is formed along a projection axis, which extends radially from a center axis along which the rod aperture is formed, and has a pair of opposite side walls and an end wall that connects the side walls to one another on a side of the projection that is opposite the rod aperture. The recesses on each piston member are configured to matingly and frictionally receive the projections on the other piston member.

Abstract: An embodiment of the present disclosure a dental chair a chair assembly configured to support a patient. The dental chair also includes a traverse motion assembly coupled to the chair assembly that move the chair assembly in a forward-backward direction. The dental chair also includes a sensor assembly having a rod rotatably fixed to the traverse motion assembly. The rod defines a first end, a second end opposite the first end, and a rod cross-sectional shape. The dental chair also includes a sensor assembly is configured to obtain data indicative a distance of linear movement of the chair assembly along the forward-backward direction between.

Abstract: A bellows accumulator, consisting of at least two housing parts (4, 6) which form an accumulator housing (2), and having a separating bellows (20), which is movably arranged in the accumulator housing (2) and separates two media spaces (8, 22) from each other and is at least on its one free end fixed to a securing device (24) in the accumulator housing (2), wherein said securing device (24) is welded to the adjacently arranged housing parts (4, 6), is characterized in that the adjacently arranged housing parts (4, 6) comprise at least in part titanium materials, in that the securing device (24) consists of at least two interconnected components (26, 30), at least one (26) of which comprises at least in part titanium materials and is welded to the adjacently arranged housing parts (4, 6), and in that the respective other component (30), consisting of a different metal material, is used for securing the separating bellows (20) to the securing device (24).

Abstract: A pneumatic remote actuating device includes an actuator block, an actuated block and a tube connecting the actuator block to the actuated block. The actuator block includes an enclosure that can be mounted on a generally flat surface. A pushbutton protrudes in front of the actuator block. Depressing the pushbutton causes an increase of pressure within an internal chamber of the enclosure. This pressure is transmitted from the actuator block, via the tube, to the actuated block. The actuated block comprises its own enclosure that can be mounted on a generally flat surface to place the actuated block in an overlapping position over an external pushbutton. The pressure transmitted from the actuator block to the actuated block causes a displacement of a pusher mounted in the enclosure of the actuated block. As a result, the pusher actuates the external pushbutton.

Abstract: The hydraulic system according to the invention comprises a hydraulic circuit with a low-pressure region and a high-pressure region; a volume- and/or speed-variable hydraulic machine, which is driven by a first electric motor and has an inlet and an outlet and provides a volume flow of a hydraulic fluid in the high-pressure region of the hydraulic circuit. The hydraulic system according to the invention further comprises at least one movable shaft, which is arranged in the high-pressure region of the hydraulic circuit; at least one valve, which separates the high-pressure region from the low-pressure region; and at least one hydraulic fluid container, which is hydraulically connected to the low-pressure region of the hydraulic circuit.

Abstract: A piston includes a piston cap and a piston rod with the piston cap being removable from the piston rod body. The piston cap includes a cap body and a socket extending into the cap body. A mounting portion of the piston rod body extends into the socket of the cap body to connect the piston rod body to the piston cap. A wear sleeve is mounted on the piston rod.

Abstract: A valve mechanism includes: a cylindrical body; a plurality of valve bodies; and a drive valve. The drive valve includes a shaft portion having a flow path penetrating in the axial direction, and a first step portion extending from an outer peripheral surface of the shaft portion to a radial outside of the shaft portion. The shaft portion has a protrusion portion protruding further toward the cylindrical body side than the first step portion and a base portion extending to a side opposite to the protrusion portion with respect to the first step portion. A gap between the valve bodies is changed by elastically deforming an inner peripheral portion of the valve body, which comes into contact with the drive valve moved in a direction approaching the valve body, in a direction approaching the cylindrical body with respect to an outer peripheral portion of the valve body.

Abstract: A hydraulic system has two hydraulic circuits, each with a pressure generating unit acting on an actuator unit. The generating units are slot-controlled radial piston pumps and form a pump assembly with a single common pump support and single common rotor. The rotor is rotatable on a free protruding section of a common support hub and has piston-receiving bores on axially offset planes. The hub has two first and two second fluid bores. The first bores communicate with first pump connections and first control openings on the hub on a first plane, and the second fluid bores communicate with second pump connections and second control openings on the hub on a second plane. A first and a second adjustment frame, each having an eccentric ring and acting on the pump pistons, are disposed on respective planes perpendicular to the main axis and independently guided in a linearly movable manner.

Abstract: Provided is a fluid actuator capable of safely driving a drive target. An air actuator using air as a working fluid includes an X-axis pressure sensor that measures air pressures PX+ and PX? along one drive axis, which drives a drive target in an X direction, a Y-axis pressure sensor that measures air pressures PY1+, PY1?, PY2+, and PY2? along two drive axes, which drive the drive target in a Y direction, and an acceleration detection unit that detects translational acceleration and rotational acceleration generated in the drive target on the basis of the measured air pressures PX+, PX?, PY1+, PY1?, PY2+, and PY2?.

Abstract: A hydraulic system includes: a slewing motor; a mechanical brake; and a slewing control valve interposed between a main pump and the slewing motor. A first pilot port of the slewing control valve is connected to a first solenoid proportional valve by a pilot line. A second pilot port of the slewing control valve is connected to a second solenoid proportional valve by a second pilot line. The first solenoid proportional valve and the second solenoid proportional valve are connected to an auxiliary pump by a primary pressure line. A switching valve is interposed between the auxiliary pump and the mechanical brake. The switching valve includes a pilot port that is connected to the first pilot line by a switching pilot line. The valve switches from a closed to an open position when a pilot pressure led to the pilot port becomes higher than or equal to a setting value.

Abstract: In a hydraulic system for a working machine, a controller is configured or programmed to increase an output-port pressure of one activation valve for one hydraulic device and an output-port pressure of another activation valve for another hydraulic device to a normal pressure higher than a preloading pressure from a state where the output-port pressure of the one activation valve is equal to the preloading pressure and the output-port pressure of the other activation valve is lower than the preloading pressure, by causing the output-port pressure of the one activation valve to be lower than the preloading pressure and increasing the output-port pressure of the other activation valve to the normal pressure.