A piston unit is provided with a piston body; a packing mounted on an outer circumferential portion of the piston body; a holding member having a plurality of magnet holding portions that are arranged along a circumferential direction; a plurality of magnets which are held at intervals in the circumferential direction; a first annular yoke disposed on one side in an axial direction of the plurality of magnets; and a second annular yoke disposed on the other side in the axial direction of the plurality of magnets.

A composite cylinder for an actuator. The cylinder includes: a radially inner fibre-reinforced polymer layer defining a hollow bore; a radially outer fibre-reinforced polymer layer; a primary conductive coil, and a first and second secondary conductive coil wound between the radially inner fibre-reinforced polymer layer and the radially outer fibre-reinforced polymer layer. The first secondary conductive coil extends axially along at least a first region of the cylinder and the second secondary conductive coil extends axially along at least a second region of the cylinder, and wherein the primary conductive coil extends axially along at least a central region of the cylinder between the first region and the second region.

A hydraulic component for vehicles, such as for maritime applications, is a hydraulic cylinder-piston unit. The piston of the hydraulic component has a piston rod with a measurement section. A magnetic rod in the piston rod extends over the measurement section. The magnetic rod has a helically varied magnetic field direction. The hydraulic component includes a sensor device having a scanning region measuring the field direction. The sensor device is arranged such that, over the entire stroke path of the piston, at least a part of the magnetic rod is located in the scanning region. The sensor device has a sensor unit configured to transmit measurement results for the field direction to a processing unit, configured to process and output the measurement results. Furthermore, the present invention relates to a hydraulic adjustment system having at least one hydraulic component and a vehicle having at least one hydraulic adjustment system.

A module for detecting the angular position of the drive shaft of a valve includes a printed circuit proximate a drive shaft of a valve body, or of an extension element thereof or a motor shaft of a valve actuator. The module also includes a magnet(s) fastened to the drive shaft, a magnetic sensor(s) supported on the printed circuit, and a communication interface. The magnetic sensor(s) generate an electrical signal indicating the position of the magnet(s). The communication interface remotely transmits a corresponding reading. The acquisition of the reading can be carried out at pre-set time intervals, which can be managed according to the requirements of the production process. The detection module is free of wired connections with the outside. A valve and an adapter element are also provided with the module, and a method for detecting the open state of the valve remotely by the module.

A head unit device for controlling motion of an object includes a chamber filled with a shear thickening fluid (STF) and a piston. The piston is housed within the chamber and exerts pressure against the STF from a force applied to the piston from the object. The STF is configured to have a decreasing viscosity in response to a first range of shear rates and an increasing viscosity in response to a second range of shear rates. The piston includes at least one piston bypass between opposite sides of the piston that controls flow of the STF between the opposite sides of the piston to selectively react with a shear threshold effect of the first range of shear rates or the second range of shear rates.

A hydraulic fluid cylinder is equipped with a cylinder tube, a piston unit, and a piston rod. The piston unit has a gasket and a piston body comprising a plurality of members and provided with a gasket-mounting groove. The piston body has a first piston member which projects to the outside from the piston rod, and also has a second piston member positioned so as to be adjacent to the first piston member. The gasket-mounting groove is formed from a combination of at least two members.

Devices, systems, and methods for detecting properties of motion of at least one component of fluid exchange devices, such as, for example, a pressure exchange device or system.

A device for detecting the elongation of a hydraulic cylinder includes an electric signal conversion device, a ruler and a positional magnetic ring. The electric signal conversion device is disposed at the bottom of a cylinder barrel. The ruler has an end fixedly connected to the electric signal conversion device, as well as the other end movably extending into a piston rod. The positional magnetic ring is fixedly connected to a piston and the positional magnetic is movably disposed around the periphery of the ruler. When the positional magnetic ring is located at different positions of the ruler, different circuits are turned on to transmit a voltage or current signal corresponding to the positions of the ruler to the electric signal conversion device, so as to obtain a position of the positional magnetic ring on the ruler, such that the elongation of the piston rod is obtained.

The invention relates to a hydraulic cylinder comprising a body (1) having a wall (3) that defines a cylindrical cavity (2), with a cylindrical cavity axis (X), in which a piston (4) is movably mounted, said piston (4) separating said cylindrical cavity (2) into two tight chambers (5, 6) that are isolated from each other, the wall (3) of the body comprising at least two passages (7, 8) for introducing or discharging a fluid into each of said two chambers (5, 6). The cylinder also comprises two end walls (17, 18) and a rigid rod (32) which is secured to the piston (4) and coaxial with the cylindrical cavity (2), said rod (32) passing through a passage opening (20) provided in one of the two end walls (17, 18). The cylinder is characterised in that it comprises a position sensor (38) comprising a sensor head (39), a sensor rod (40) which is secured to the sensor head (39) and around which a magnet (41) is fitted, and a connector (42) connected to said sensor head (39).

One object is to reduce a weight of a fluid actuator. The fluid actuator includes: a cylinder having an inner space and a first mounting portion, the inner space being partitioned into a first fluid chamber and a second fluid chamber, the first mounting portion being disposed on an end portion of the cylinder on an axial direction A side; and a piston rod configured to reciprocate in accordance with pressures in the fluid chambers. A wall portion defining the first fluid chamber in the cylinder is made of an iron-based alloy. A wall portion defining the second fluid chamber in the cylinder is made of an aluminum alloy. The piston rod is made of an iron-based alloy.