Abstract: A measuring device for determining torque includes a measuring system, e.g. measuring coils, and a twistable torsion pipe (10) having throughgoing openings (12) extending in the axial direction. Crosspieces (13, 14) of different widths are located between the throughgoing openings (12). Slots (15) are formed across the broader crosspieces (13). Accordingly, at lower torques, the torque is transmitted only by the narrow crosspieces (14). If the torque exceeds the rigidity of the narrow crosspieces (14), the slot (15) is closed, i.e. the two parts (13a, 13b) of the broad crosspiece (13) contact one another. Accordingly, a higher torque can be transmitted by the crosspieces (13) in a second measurement area or, if the rigidity of the crosspieces (13) is great enough, the latter can be used as protection against overloading. Further, it is also possible to provide additional overload protection by providing a recess (35) and a protuberance (36) in the torsion pipe (10).

Abstract: A measuring device for determining the angle of rotation has a coil body (11) having two cores (12, 13) which are approximately semicircular in cross section and are offset relative to one another in the axial direction. Further the cores (12, 13) are offset by 180.degree. relative to one another in the radial direction. A coil (20, 21) in a working connection with a measuring part (22) of electrically conductive and/or ferromagnetic material is wound on each of these cores (12, 13). The measuring part (22) is constructed as a sleeve segment and covers half the circumference of the coil body (11). The measuring part (22) is directly connected by a carrier (23) with the shaft (17) whose rotational movement is to be determined. The shaft (17) is supported in the coil body (11) along a relatively long distance. This has the advantage that the complete sensor can be mounted at a holding device. Accordingly the costly adjustment of the sensor during final assembly is dispensed with.

Abstract: A device for measuring an angle of rotation or a torque of a rotating machine part includes a radially extending bending rod secured to the machine part for joint rotation therewith, first and second sleeve-shaped bodies secured at an end of the bending rod remote from an axis of the rotating machine part, in spaced relationship to each other, each of the first and second sleeve-shaped bodies having a plurality of slots equidistantly spaced from one another and offset circumferentially relative to the slots of another of the first and second sleeve-shaped bodies, and a third sleeve-shaped body having a plurality of equidistantly spaced slots and arranged between the first and second sleeve-shaped bodies. At least one coil is assigned to each of the first and second sleeve-shaped bodies.

Abstract: A measuring device for contactless determination of a change in a linear travel or angle of rotation includes two bodies movable relative to one another, and at least two electrical elements arranged on one of the two bodies and connected in at least one electrical bridge circuit. Electrical characteristic values of the two electrical elements vary in accordance with relative change assigned areas of the other of the two bodies. The two electrical elements have different electrical measurement sensitivities for fixing a place with a highest measurement accuracy and smallest drift errors within a measurement area of the measuring device.

Abstract: Fuel injection pump for internal combustion engines comprising a displacement pickup for determining the position of control elements arranged in a pump housing. The displacement pickup comprises a movable part, which is arranged in the pump housing and is connected with the control element, and a stationary part which is arranged on the outside of the pump housing. The position of the movable part of the displacement pickup is determined by the stationary part by means of a measuring process which measures in a contactless manner, e.g. by means of the induction or eddy current principle.

Abstract: A measuring device for contactless determination of a rotary angle has two movable members which are rotatable relative to one another and two sensor coils whose resistance value to alternating current is varied by relative changes of values of regions of the members associated with the coils. One of the bodies members has a region corresponding to a number of the coils. At least one of the coils formed as a wire coil is arranged on the region. At least one second of the members is arranged on both end sides of the first member.

Abstract: A device for measuring an angle of rotation has a central longitudinal groove (12) extending in a coil body (11) from the front end surface thereof so that two cores (13, 14) having a semicircular cross-sections are formedd. A coil (15, 16) is wound on each of these cores (13, 14) in the circumferential direction, which coils (15, 16) are in a working connection with a measuring part (17) having areas of electrically conducting and/or ferromagnetic material. The measuring part (17) is constructed as a sleeve segment and overlaps half of the circumference of the coil body (11) as seen in the circumferential direction. Measurement errors are eliminated to a great extent by connection and arrangement of the coils (15, 16) relative to one another.

Abstract: A measuring device for contact-free measuring of a rotation angle and/or torque of shaft comprises two coaxial bodies fastened on shaft stubs and rotatable relative to one another. The bodies have on their adjacent outer surfaces an equal number of areas having high and low electrical conductivity alternating in the circumferential direction. The bodies are enclosed by coils connected in a Wheatstone bridge circuit. A high-frequency alternating current flows through the coils and produces a magnetic alternating field which generates eddy currents in the outer surface areas of the two bodies in proportion to the magnitude of the surfaces of the two bodies penetrated by the magnetic alternating field.

Abstract: In a measurement device for contactless determination of the rotation angle and/or rotation speed, a disk is fastened on a shaft so as to be fixed with respect to rotation relative to it. During the measurement process, layers of material with good electrical conductivity which are arranged on one or both opposing sides of the disk are moved relative to receiver coils located on opposite sides of the disk (16a and 16b). The measurement device can work according to the eddy current measurement method, as well as according to the inductive method. In order to compensate for measurement errors, the conductive layers are arranged at approximately equal distances (a, b) between two coils. In addition, the greatest possible quantity of measurement points can be used for forming an average.

Abstract: A device for determining a length of linear movement of an angle of rotation of a machine part, and comprising spaced first and second bodies, a coil arranged on one of the first and second bodies, and a diaphragm connectable to a machine part for joint displacement therewith and arranged between the first and second bodies for movement relative to the one of the first and second bodies, which diaphragm has an area formed in such a manner than an inductive effect and an eddy current effect which result from axial oscillation of the diaphragm, upon flow of an alternating current through the coil, cancel each other with respect to their electrical action on the coil.

Abstract: Two regions (11, 12) of a shaft (10) are coated with a film which is free of prestress and consists of magnetoelastic Fe/Ni material. The films have a stripe pattern arranged respectively at angles of +45.degree. and -45.degree.. The change in permeability of these films is a function of the mechanical stress of the shaft (10), particularly of the torsion, and is detected by means of sensor arrangements (13 and 14). A characteristic line for the mechanical stress which extends linearly over the entire range of measurement is made possible by means of an evaluating circuit (22) of the measured voltages.

Abstract: An arrangement for automatic release of occupant protecting devices in vehicles, particularly power vehicles, by means of producing a control signal in response to a deviation from an acceptable position or an acceptable condition of a vehicle, the arrangement comprises a sensor including a base plate provided with at least one coil through which a high-frequency alternating current flows, a seismic mass composed of an electrically conductive material at least in the region of the coil and movably suspended near the base plate so as to be in an operative connection with the coil, a pendulum-like suspending member which supports the seismic mass so as to enable a substantially parallel movement of the seismic mass relative to the coil, and a perforated member which coats the coil, the perforated member being composed of an electrically conductive material and provided with at least one slot.

Abstract: An apparatus for the automatic release of passenger protection devices in motor vehicles in the event of an accident has a sensor (35) having a mass (10) secured outside the center of mass (11). This mass (10) generates a comparably high torque in the suspension in the event of both positional change and rotational acceleration. These torques are detected with known measuring methods and split, with the aid of a high-pass filter (36) and a low-pass filter (40), into a high-frequency and a low-frequency portion. The high frequency portion corresponds to the rotational acceleration, from which the rotational velocity is obtained by means of an integrator (38). The low-frequency portion corresponds to the position of the motor vehicle. Thus both measurement variables that must be detected for releasing a roll bar are obtained with a single sensor (35).

Abstract: A coil sensor excited with alternating current and connected in a circuit for detecting changes in the coil impedance producing a signal exceeding a fixed threshold value in response to the revolution of a wheel with features providing periodic changes in the spacing between the coil and the wheel, has its periphery subdivided into zones where the surface material is alternately thereomagnetic and non-theromagnetic. With a suitable setting of the frequency of the exciting alternating current and a suitable choice of the materials with respect to their eddy current and magnetic induction effect on the inductance of the coil, it is possible to suppress the signal of once per revolution periodicity resulting from wheel eccentricity, bearing wobble or the like.

Abstract: To improve the output sensitivity of two concentric, telescopic sleeves (8, 9), respectively secured at their end portions to stub shafts (2, 5; 3, 4) which are aligned, and connected, for example, by a torsion element (1), so that torque being transmitted by the shafts through the torsion element can be determined, the sleeves are cut with axial slits (11, 16, 17) in which the cuts of one of the sleeves extend only over half the axial length and are offset with respect to each other, two windings (20, 21) being wound over a winding form (18) surrounding the outer one of the sleeves, and positioned centrally with respect to the half-slits (16, 17); upon applying high-frequency alternating current to the windings, and relative rotation of the sleeves, which will bring one of the half-slits in alignment with the axially extending slit (11) in the other sleeve, while rotating the other half-slit out of alignment, changes in inductance of the windings can be determined due to change in eddy currents being induced

Abstract: An apparatus for contactless distance, or travel and/or speed measurement of bodies moving substantially uniformly is disclosed. The apparatus has zones of electrically conductive material which are displaced in synchronism with the body and a measuring transducer disposed at a distance therefrom and spatially fixed, the measuring transducer having a high-frequency alternating current flowing through it. To permit construction of a measuring transducer having large geometric dimensions while detecting narrow electrically conductive zones (10) of attaining measurement signals which are relatively invulnerable to malfunction, the measuring transducer (15) is extended spatially over a multiplicity of zones (10) and has individual, active measuring faces (16) which are interconnected and spatially demarcated.

Abstract: Measuring apparatus for the torque transmitted through a shaft consists of a first and second induction member respectively mounted at the input and the output end of the shaft for rotation therewith. The induction members are discs or concentric cylindrical elements made of a conductive material, each member having sector-shaped cut-out portions. The sector-shaped cut-out portions of the two members are aligned for a predetermined starting torque. A coil is mounted opposite one of the members and generates a high frequency magnetic field. The magnetic field induces eddy currents in the members. The eddy currents in the second member increase as the conduction material of the second member shifts toward exposure to the coil through the cut-out portions of the first member. Increases in eddy currents cause decreases in inductivity of the coil which, when measured, constitute a measure of the transmitted torque.