A hub assembly for coupling a road wheel of an automotive vehicle to the suspension system of the vehicle includes a housing and a hub having a spindle which extends into the housing where it rotates on a bearing having rolling elements arranged in two rows. The spindle carries a target wheel between the two rows of rolling elements, and the housing has a hole which opens into the space between the two rows. Here the housing is fitted with a sensor that monitors the rotation of the target wheel. The sensor has a bushing which is within the hole and a probe which extends from the bushing into the housing where it has a pickup area that is presented toward the target wheel. The bushing is positioned within the hole by an O-ring that is compressed between it and the surface of the hole. The bushing also has a leading surface that leads up to the O-ring and has a diameter only slightly less than the diameter of the hole. It also has a trailing surface of lesser diameter on the other side of the O-ring. The leading surface prevents the probe from deviating from its desired position and facilitates installation of the sensor in the housing.

A rotation sensor includes Hall elements 4 which detect proximity of a magnetic rotation body 3; a permanent magnet 6 which is adjacent to the Hall elements 4 to apply a magnetic field to the Hall elements 4; a main portion 1a on which the Hall elements 4, the permanent magnet 6, and a terminal 7 that is electrically connected to the Hall elements 4 are mounted; and a connector portion 1c in which terminal parts 7a for leading out the terminal 7 to the outside are incorporated. In the rotation sensor, the connector portion 1c is led out in a direction same as the placement direction of the magnetic rotation body 3 and horizontally to the magnetic rotation body 3.

A sensor assembly includes a spool that has magnetic filaments incorporated therein. The magnetic filaments are magnetized to create a magnetic flux around the spool. A coil is wound around the spool such that it is within the magnetic flux field generated by the spool. A target wheel having plural teeth and plural slots is placed so that its outer periphery is slightly spaced from the target wheel. As the target wheel rotates, it induces changes in the magnetic flux density sensed by the coil. The changes in flux density can be used to determine the angular position and angular speed of the target wheel and a moving part attached thereto. Since the spool is magnetized, the need for a separate magnet is obviated.

An assembly that includes a target component mounted for rotation about an axis, a sensor mounted adjacent the inner member and directed toward the inner member to measure the rotational speed of the target component and an outer component interposed between the sensor and the target component. Low magnetic permeability of the outer component is assured by appropriate selection of the material, maintaining the concentration of martensite in the outer component below a reference concentration as indicated by certain reference indices such as the Instability Function, and/or by maintaining the temperature at which a stamping operation is performed on the inner member above a pre-determined temperature.

A sensor package and method of making the same is disclosed in which the sensor package includes a sensor component for electromagnetic sensing having a holder assembly with the sensor component disposed at one end and sensor terminals in electrical communication with the sensor component extending from an opposite end. A harness assembly having a harness head configured with harness terminals extending therefrom for electrical connection with corresponding sensor terminals. The holder assembly and harness head are configured with a means for snap-fit assembly that provides space to mechanically connect corresponding sensor terminals and harness terminals with each other forming a resultant subassembly for insertion into a sensor housing. The housing further includes a heat-staked interface with the harness head that secures the subassembly relative to the sensor housing. A bracket and an elastomeric seal may be disposed in corresponding grooves configured on the sensor housing to complete assembly of the sensor package.