Abstract: A device (16) for sensing the axial position, in relation to the other component, of one of two components mobile relative to each other, in particular a piston (12) in relation to a cylinder housing (14), which device has a magnetic signal element (18) arranged on the one component and a magnetic-flux-sensitive sensor (20, 20?) arranged on the other component, of which the axial relative position of the signal element to the sensor can be detected. One flux guide element (22, 22?) is allocated to the sensor stationary in relation to the sensor, which extends on the other component at least over the area to be detected of the axial relative positions of the signal element to the sensor and comprises a plate section of a magnetizable material, wherein the sensor is arranged at one longitudinal end of the flux guide element outside the area to be detected of axial relative positions.

Abstract: A device is disclosed for the optional engaging and disengaging of a friction clutch for motor vehicles with a preferably hydraulic actuating mechanism, such as a central disengaging device, which, in order to apply an actuating force, is operatively connected with the friction clutch via at least one actuating force transmission member, such as a release bearing, which is pre-stressed in the disengaging direction by means of a spring. The device also has a sensor device with a sensor for sensing a variable representative of the engaging respectively disengaging state of and/or the state of wear on the friction clutch. According to the invention, the force of the spring for pre-stressing the actuating force transmission member or of a spring arranged in parallel with it can be sensed using the sensor, as a variable representative of the disengaging and engaging state of and/or the state of wear on the friction clutch.

Abstract: A device is disclosed (16) for sensing the axial position, in relation to the other component, of one of two components mobile relative to each other, in particular a piston (12) in relation to a cylinder housing (14), which device has a magnetic signal element (18) arranged on the one component and a magnetic-flux-sensitive sensor (20, 20?) arranged on the other component, by means of which the axial relative position of the signal element to the sensor can be detected. According to the invention, allocated to the sensor is at least one flux guide element (22, 22?) stationary in relation to the sensor, which extends on the other component at least over the area to be detected of the axial relative positions of the signal element to the sensor and comprises a plate section of a magnetizable material, wherein the sensor is arranged at one longitudinal end of the flux guide element outside the area to be detected of axial relative positions.

Abstract: A device is disclosed for the optional engaging and disengaging of a friction clutch for motor vehicles with a preferably hydraulic actuating mechanism, such as a central disengaging device, which, in order to apply an actuating force, is operatively connected with the friction clutch via at least one actuating force transmission member, such as a release bearing, which is pre-stressed in the disengaging direction by means of a spring. The device also has a sensor device with a sensor for sensing a variable representative of the engaging respectively disengaging state of and/or the state of wear on the friction clutch. According to the invention, the force of the spring for pre-stressing the actuating force transmission member or of a spring arranged in parallel with it can be sensed using the sensor, as a variable representative of the disengaging and engaging state of and/or the state of wear on the friction clutch.