Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1994-10-28
1996-08-27
O'Shea, Sandra L.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
32420722, 384448, G01P 348, G01B 714, F16C 4104
Patent
active
055504671
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for measuring rotation and for generating an electric alternating signal representative of the rotation.
BACKGROUND OF THE INVENTION
Devices for measuring rotational speed are required for instance for the measurement of the wheel speeds for anti-lock control systems, traction slip control systems or vehicle suspension control systems of automotive vehicles. In such applications, every vehicle wheel is equipped with such a wheel sensor. High demands are placed on the operability and reliability of the sensors. A major portion of the total costs for such a control system is incurred for the manufacture and the assembly of the sensors. It is in particular required in known rotation measuring devices to accurately adjust and preserve the air gap between the stationary transducer or sensor, respectively, and a toothed disc coupled to the wheel. The usefulness of the signal and the distance of the useful signal from inevitable corrective signals is dictated to a large degree by the adjustment and the preservation of the air gap. Therefore, there is a need to develop sensors which allow manufacturing with relatively little effort and which lend themselves to ease of assembly and, if necessary, ease of replacement.
Further, so-called wheel bearing sensors are known wherein the sensor and the pulse generator ring (or the toothed disc) are mounted directly into the wheel bearing. As a result, the sensor is required to fit within small spaces. However, precise assembly and adjustment is still necessary because tolerances for the air gap between the sensor and the pulse generator ring have to be maintained.
SUMMARY OF THE INVENTION
The object of the present invention is to develop a measurement device which is particularly suited for mounting into a wheel bearing and which is easy to manufacture, compact in design, and simple to assemble and adjust.
It has proved that this object can be achieved by a measurement device of the type initially referred to if the transducer is arranged in the axis of rotation of the part performing the rotation and the signal generator ring is designed as a component part of a hollow-cylindrical or bowl-shaped part which is rotatably supported on the housing of the transducer and is coupled to the part performing the rotation by means of a follower, by a snug fit or the like.
The present invention is a particularly simple measurement device comprising a signal generator ring in the form of a hollow-cylindrical part which is rotatably supported directly on the housing of the transducer and which, during the assembly of the sensor, is coupled to the wheel by means of a follower. Because the signal generator ring does not have to transmit any forces, it is sufficient to apply a sliding layer on the sensor housing for the support of this ring.
Further, it is an advantage that the signal generator ring can be fitted on the sensor prior to assembly so that the need for a setting is obviated when the complete measurement device is mounted into the wheel bearing.
A preferable embodiment of the present invention includes a double-sided measurement system arranged in the sensor housing perpendicularly to the axis of rotation. An improvement of the useful signal can be accomplished thereby even when the transducer has a compact design. Further, the requirements regarding the central position of the transducer with respect to the signal generator ring are minimized because an increased air gap on one side automatically results in a decreased air gap on the other side of the double-sided measurement system.
In another embodiment, the present invention includes a particularly expedient double-sided measurement system including a measuring coil which contains a permanent magnet core magnetized perpendicularly relative to the measuring coil axis. Arranged on the two pole surfaces of the permanent magnet is each one elongated, plate-shaped pole shoe. The pole shoes project on either side of the coil and extending almost up to the inn
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ITT Automotive Europe GmbH
Lewis J. Gordon
O'Shea Sandra L.
Phillips Roger
Twomey Thomas N.
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