The present invention is based on the objective of disclosing a rotary sensor arrangement in which the sensor is accessible without having to remove any assemblies, wherein said sensor arrangement also allows an economical integration into existing assemblies. According to the invention, this objective is attained with a rotary sensor arrangement for elements that can be turned relative to surrounding elements, in particular, for shafts, which consists of at least two sensor units that can be mounted separately from one another, wherein one sensor unit is arranged on the rotatable element and at least one second sensor unit is arranged on an element that is stationary relative to the rotatable element, and wherein at least the second sensor unit can be accessed and removed independently of the state of installation of the rotatable element.

A speed sensor for an adaptive braking system is disclosed. The sensor is enclosed in a housing, so that all critical adjustments may be made at the time the sensor is manufactured and not when the sensor is installed on the vehicle. The entire sensor package is small enough to be mounted within the tubular axle used on many relatively large vehicles, such as semi-trailers, which are in use today. A driving connection is provided between the speed sensor and the hub cap of the vehicle, which of course, rotates with the corresponding vehicle wheel.

A wheel speed sensor including a rotor and a stator with the stator being coaxially disposed within an elastomeric member for incremental axial movement upon engagement with the rotor. The stator includes a pole member, a bobbin and coil assembly, and a magnet which are axially aligned to provide an elongated stator structure which is coaxially disposed in a tubular member which guides the incremental axial movement of the stator. A method for prestressing the elastomeric member for setting the required applied force for axially moving the stator.

A measuring sensing device for generating a signal corresponding to the relative rotation between two construction parts, with a rotor arranged on the rotating construction part and a stator borne on the fixed construction part, the stator being supported by one or more clamping bodies on the fixed construction part in such a way that on overcoming a considerable frictional adhesion it is slidable with respect to the fixed construction part.

A wheel speed sensor for a wheel mounted on the end of an axle shaft of a drive axle can be utilized in an anti-wheel lock brake control system. The sensor includes an electromagnetic sensing device which is mounted on the drive axle housing in alignment with the axle shaft inwardly of the wheel. An excitor rotor of the sensor is preferably mounted on the differential casing about the axle shaft in alignment with the sensing device for rotation while maintaining the distance between the sensing device and the rotor within a predetermined limit without allowing contact therebetween. A C-shaped spring partially encircles the rotor as a pair of tabs at its ends extend inwardly through the rotor to make contact with a corresponding pair of grooves in the axle shaft. The C-shaped spring member drives the rotor in response to rotary movement of the axle shaft but allows removal of the axle shaft for maintenance while the rotor is retained within the protective interior of the housing.