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.

The self-contained energy efficient hydraulic actuator system of the present invention includes a hydraulic cylinder, a servo motor that is configured to produce rated torque from zero RPM to maximum rated RPM with rotor speed/position feedback to a servo motor, a pump, and a solenoid valve that enables the hydraulic cylinder to maintain its position without the motor running. The system has the ability to hold a load in place without motor operation via the use of the solenoid valve, and therefore saves energy and extends the motor lifetime by minimizing the motor running time.

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.

A wheeled work vehicle includes: a transmission transmitting the rotational power of a traveling hydraulic motor to wheels; a traveling control valve having an interruption position that interrupts supply of hydraulic fluid from a hydraulic pump to the traveling hydraulic motor; a shift changeover valve that shifts the speed stage of the transmission by the position of the shift changeover valve being selectively switched; and a controller that controls the traveling control valve and the shift changeover valve. The controller switches the traveling control valve to the interruption position, then switches the position of the shift changeover valve such that the speed stage of the transmission is shifted to the low speed stage, and switches the traveling control valve from the interruption position to an original position side before the switching in a case where the controller shifts the transmission from the high speed stage to the low speed stage.

In a brake fluid pressure control apparatus, a sensing device is integrally fixed to a master piston. The sensing device including the body to be sensed, which may include a magnet, and a sensing body, which may include a sensor. The sensing bodying sensing an axial position of the master piston without relative movement, that is, without providing play. This arrangement improves the sensing precision of the sensing device. Since it is not necessary to provide a member separate from the master piston in order to retain the body to be sensed, it is possible to achieve downsizing of the brake fluid pressure control apparatus.

A hydraulic cylinder may include a housing and a rod extending from a working end positioned outside the housing through a rod end of the housing to a piston end positioned within the housing. The hydraulic cylinder may also include a piston arranged on the piston end of the rod and configured to articulate within the housing. The hydraulic cylinder may also include a cap end secured to the housing and having a pocket for receiving a sensor. The pocket may have a cylindrical sidewall. The cap end may include a bore extending therethrough and arranged generally tangential to the sidewall where the bore extends into the cap end, breaches the sidewall, and extends further passed the pocket. The hydraulic cylinder may also include a retention pin configured for placement in the bore and for an interference fit with the sensor when the sensor is arranged in the pocket.

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 piston for a fluid-actuated working cylinder, with a piston base unit which is coaxial to a piston longitudinal axis, consisting of a rigid core body which has radial outer peripheral surface and of an annular filling body which is seated in an annular receiving groove. The receiving groove is coaxial to the piston longitudinal axis and in the region of the radial outer peripheral surface is designed with a radially outwardly facing groove opening in the core body. The piston further includes a ring element which consists of plastic. The ring element radially outwardly coaxially encompasses the piston base unit at least in the region of the filling body, being radially supported with a radial inner peripheral surface on the piston base unit, projecting radially beyond the radial outer peripheral surface of the core body and comprising an axially orientated axial support surface radially outside the piston base unit on its two axial face sides. The piston further includes an annular enveloping body which has rubber elastic characteristics.

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 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.