An inductive position sensor may be configured to detect relative position between a first member and a second member. The inductive position sensor may include an inductive sensor element configured to be coupled to the first member and a screening layer formed over a screened portion of a member surface of the second member such that an exposed portion of the member surface is free of the screening layer. The screening layer may be configured to reduce an effect on induced signals in the inductive sensor element caused by the screened portion of the second member.

The invention relates to a distance-measuring device for determining a distance between a reflection body in a conducting structure and a coupling region for electromagnetic waves, which region is provided on an end section of the conducting structure, said measuring device comprising a transmitting and receiving device, and a conduction junction (1) provided on the coupling region, for coupling the transmitting and receiving device to the conducting structure containing a medium, in order to couple an electromagnetic wave into the conducting structure, and to decouple the electromagnetic wave, reflected on the reflection body, from the conducting structure. Said measuring device also comprises an evaluation device for determining the distance between the coupling region and the reflection body from the complex reflection coefficient between the coupled electromagnetic wave and the decoupled electromagnetic wave. The invention also relates to the corresponding method.

A piston and cylinder unit (1) of a working machine, for example a wheel loader, excavator, tipper, crane or stacker or a lifting platform serves to steer, support, extend, pivot, lift or other movements of the working machine or of a tool or a different part of the working machine. The piston and cylinder unit (1) includes a cylinder (2), a piston (7) being arranged in the cylinder (2) to be axially movable along a longitudinal center axis (54) and a piston position detection unit (28). The cylinder (2) includes a mounting bore (27) extending radially in the cylinder (2). The piston position detection unit (28) is arranged in the mounting bore (27) and detects the axial position of the piston (7) in the cylinder (2) by high frequency technology. The piston position detection unit (28) includes an antenna (46) for sending and receiving high frequency signals. A collimator (57) is arranged in the beam path of the antenna (26). The antenna (26) has a main sense of direction of radiation (63) extending parallel to the longitudinal center axis (54).

The invention relates to a distance-measuring device for determining a distance between a reflection body in a conducting structure and a coupling region for electromagnetic waves, which region is provided on an end section of the conducting structure, said measuring device comprising a transmitting and receiving device, and a conduction junction (1) provided on the coupling region, for coupling the transmitting and receiving device to the conducting structure containing a medium, in order to couple an electromagnetic wave into the conducting structure, and to decouple the electromagnetic wave, reflected on the reflection body, from the conducting structure. Said measuring device also comprises an evaluation device for determining the distance between the coupling region and the reflection body from the complex reflection coefficient between the coupled electromagnetic wave and the decoupled electromagnetic wave. The invention also relates to the corresponding method.

A piston and cylinder unit (1) of a working machine, for example a wheel loader, excavator, tipper, crane or stacker or a lifting platform serves to steer, support, extend, pivot, lift or other movements of the working machine or of a tool or a different part of the working machine. The piston and cylinder unit (1) includes a cylinder (2), a piston (7) being arranged in the cylinder (2) to be axially movable and a piston position detection unit (28) detecting the axial position of the piston (7) in the cylinder (2) by high frequency technology. The piston position detection unit (28) includes a housing (3) and an electronic unit being arranged in the housing is arranged in a mounting bore (27) extending radially in the cylinder (2). The piston position detection unit (28) is arranged in the mounting bore (27) such that the interior (3) of the cylinder (2) is sealed from the surroundings of the piston and cylinder unit (1) by the housing (29).

The invention relates to a distance-measuring device for determining a distance between a reflection body in a conducting structure and a coupling region for electromagnetic waves, which region is provided on an end section of the conducting structure, said measuring device comprising a transmitting and receiving device, and a conduction junction (1) provided on the coupling region, for coupling the transmitting and receiving device to the conducting structure containing a medium, in order to couple an electromagnetic wave into the conducting structure, and to decouple the electromagnetic wave, reflected on the reflection body, from the conducting structure. Said measuring device also comprises an evaluation device for determining the distance between the coupling region and the reflection body from the complex reflection coefficient between the coupled electromagnetic wave and the decoupled electromagnetic wave. The invention also relates to the corresponding method.

The invention relates to a device for guiding an electromagnetic wave within a cylinder head of a cylinder system, wherein the device comprises analysis electronics arranged in or on the cylinder head and a probe located in the cylinder head, as well as a connecting structure guiding the electromagnetic wave and arranged between the analysis electronics and the probe for versatile positioning of the analysis electronics, the connecting structure having a first signal connection (101, 201, 301, 401, 501a, 501b, 601, 701) for connection to the probe and a second signal connection (314, 514a, 514b, 714) for connection to the analysis electronics.

A piston and cylinder unit (1) of a working machine, for example a wheel loader, excavator, tipper, crane or stacker or a lifting platform serves to steer, support, extend, pivot, lift or other movements of the working machine or of a tool or a different part of the working machine. The piston and cylinder unit (1) includes a cylinder (2), a piston (7) being arranged in the cylinder (2) to be axially movable and a piston position detection unit (28) detecting the axial position of the piston (7) in the cylinder (2) by high frequency technology. The piston position detection unit (28) includes a housing (3) and an electronic unit being arranged in the housing is arranged in a mounting bore (27) extending radially in the cylinder (2). The piston position detection unit (28) is arranged in the mounting bore (27) such that the interior (3) of the cylinder (2) is sealed from the surroundings of the piston and cylinder unit (1) by the housing (29).

A waveguide-coupling device (14) for a hydraulic cylinder (10) has an outer conductor element (22) to which a microwave signal can be supplied, an inner conductor element (24) for coupling a waveguide mode into a liquid-filled inner chamber (16) of the hydraulic cylinder (10) and a dielectric insulating element (22) arranged between the inner conductor element (24) and the outer conductor element (20), wherein the inner conductor element (24) and the dielectric insulating element (22) as well as the dielectric insulating element (22) and the outer conducting element (20) are each connected to each other in a liquid-tight manner.

An inductive position sensor may be configured to detect relative position between a first member and a second member. The inductive position sensor may include an inductive sensor element configured to be coupled to the first member and a screening layer formed over a screened portion of a member surface of the second member such that an exposed portion of the member surface is free of the screening layer. The screening layer may be configured to reduce an effect on induced signals in the inductive sensor element caused by the screened portion of the second member.