Abstract: A two-layer ceramic composite material, wherein the first predominantly load-bearing layer is an oxidic, carbon-free fiber-reinforced ceramic layer which is made by a colloidal process. The second predominantly thermally insulating layer is an oxide-ceramic foam. The colloidal process produces carbon-free oxide ceramics which, because of their high purity, have low dielectric losses in the entire usage temperature range. In addition, the colloidal process provides a simple and cost-effective production method.

Abstract: A release mechanism for actuating a friction clutch between an internal combustion engine and a transmission of a motor vehicle that is designed for concentric assembly on a guide sleeve mounted on a transmission shaft in order to bear against a release spring of the friction clutch where the guide sleeve and the friction clutch each having a respective center axis. The release mechanism includes a clutch release bearing. The release mechanism also includes a first device for compensating for at least one of a tilt between the center axes and wobbling eccentricity of the release spring where the first device includes a spherical surface between the release bearing and the guide sleeve, and a second device for compensating for offset between the center axes.

Abstract: A two-layer ceramic composite material, wherein the first predominantly load-bearing layer is an oxidic, carbon-free fiber-reinforced ceramic layer which is made by a colloidal process. The second predominantly thermally insulating layer is an oxide-ceramic foam. The colloidal process produces carbon-free oxide ceramics which, because of their high purity, have low dielectric losses in the entire usage temperature range. In addition, the colloidal process provides a simple and cost-effective production method.

Abstract: A release mechanism for actuating a friction clutch between an internal combustion engine and a transmission of a motor vehicle that is designed for concentric assembly on a guide sleeve mounted on a transmission shaft in order to bear against a release spring of the friction clutch where the guide sleeve and the friction clutch each having a respective center axis, includes a clutch release bearing. The clutch release bearing includes an inner ring, an outer ring, and a sliding sleeve connected with one of the inner ring and outer ring for axial movement with respect to the guide sleeve. The release mechanism also includes a first device for compensating for at least one of a tilt between the center axes and wobbling eccentricity of the release spring where the first device includes a spherical surface between the release bearing and the guide sleeve, and a second device for compensating for offset between the center axes.

Abstract: A disengagement mechanism for a friction clutch which is to be arranged between an internal combustion engine and a transmission flanged to the internal combustion engine by a casing includes a guide pipe fastenable in the casing. A release bearing element is guided radially at the outer circumference of the guide pipe so as to be axially movable thereon. The disengagement mechanism also includes a clutch lever which is to be articulated at the casing for transmitting clutch actuating forces to the release bearing element. At least the guide pipe, the release bearing, and the clutch lever are held together to form a constructional unit prior to their arrangement between the internal combustion engine and the transmission by movement limiting device, thereby facilitating the assembly of the disengagement mechanism. In the operation-ready, installed state, the movement limiting devices influences the movability of the disengagement mechanism.

Abstract: A disengaging mechanism for a friction clutch which is arranged in a motor vehicle between an internal combustion engine and a transmission flanged to the internal combustion engine by a casing. The disengaging mechanism includes a guide pipe which is fastenable in the casing. A release bearing element is guided radially at the outer circumference of the guide pipe so as to be axially movable. The disengaging mechanism also includes a clutch lever which is to be articulated at the casing for transmitting clutch actuating forces. At least the guide pipe and the clutch lever are held together to form a constructional unit prior to installation in the motor vehicle. In the operation-ready state, the movement limiting components influence the movability of the disengaging mechanism. Assembly is facilitated by constructing the disengaging mechanism as a constructional unit, which can also contain the release bearing element.

Abstract: In a sensor system including Doppler radar, a radiometer and circuits for comparing the target information received by the two devices, a receiving mixer comprising a mixer oscillator is employed both for transmitting the CW Doppler radar emission signal and for transforming the frequency of the returning radar echo and radiometer signal. At the output of the mixer, the Doppler signal is obtained as a low-frequency signal and the radiometer signal as an IF signal, so that both can easily be separated and individually processed. The radiometer signal is checked only for a jump in the noise temperature. With such a jump present and if simultaneously a radar target is detected, the presence of a metallic target is inferred.

Abstract: In a microwave transceiver including a dielectric antenna and a self-oscillating semiconductor mixer stage for both generating a microwave signal to be transmitted via the antenna and mixing that microwave signal with reflected microwave signal components received by the antenna, the mixer stage being composed of a nonlinear microwave diode connected to give the stage a negative impedance to permit oscillation and to effect mixing, and a half-wavelength disc-type resonator providing a resonant circuit for the oscillator and having the form of a stripline piece element composed of two strip conductors between which the microwave diode is electrically conductively connected, the antenna being disposed on one of the strip conductors, the resonator and antenna are constructed to be axially symmetrical and are positioned coaxially to one another.

Abstract: A semiconductor oscillator circuit for very short waves, particularly for UHF, employing the stripline technique and utilizing capacitive voltage division in order to provide feedback. The stripline technique is employed at least, for all the discrete frequency determining (capacitive and inductive) components of the circuit and for the feedback path of the circuit. The series connection of the two capacitors forming the capacitive voltage divider is connected in parallel with a further capacitor, formed in stripline technique, whose capacitance lies in the same order of magnitude as that of one of the capacitors of the capacitive voltage divider and the two capacitors which have the same order of magnitude in capacitance are formed by two conductor electrodes which are parallel to each other at a very small mutual distance with respect to their geometric dimensions, which have a length and width corresponding to their capacitance, and which have a common return electrode.