Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1997-10-21
2000-03-14
Patidar, Jay
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324174, 32420725, 384348, G01P 344, G01P 3488
Patent
active
060377666
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device used for measuring rotary motions, and more paraticularly relates to a rotating signal generator, a stationary sensor used as a transducer, and a sensor-accommodating housing which accommodates the sensor and which positions and retains the sensor in this position, with the sensor being insertable into the housing.
BACKGROUND OF THE INVENTION
German patent application No. 42 06 910 discloses a measuring device which is generally composed of a signal generator ring, a stationary sensor and a housing used as a sensor holding means. The sensor is inserted into the housing and positioned and retained therein in a predetermined position. The sensor is preferably a wheel bearing sensor.
In German patent application No. 42 13 977, the sensor and sensor housing of a wheel bearing sensor of this type are arranged in the axis of rotation of the wheel whose rotary motion is to be measured. An annular or bowl-shaped component having inwardly directed teeth that rotates with the wheel is used as a signal generator. The sensor includes a double-sided measuring coil having pole shoes that project from both sides and extend as far as the inside surface of the signal generator. The sensor of this reference is also inserted into the associated sensor-accommodating housing.
Wheel bearing sensors of this type are required, for example, in automotive vehicles for measuring the rotating speeds of the individual vehicle wheels when the vehicle is equipped with an anti-lock or traction slip control system, or any other vehicle control system. Reliability in operation, but also manufacturing and assembling costs, is of vital importance in such applications.
The generic German publication No. 40 33 064 also discloses a device for measuring rotary motions. In this reference, the exact position of the sensor relative to the component to be monitored can be adjusted during the assembly by way of projections on the sensor-accommodating housing. The projections interact with an adjusting member in which the sensor is arranged. The manufacture of a device of this type, however, is complicated and costly.
An object of the present invention is to construct a bearing sensor or a measuring device of this type so that the expenditure in manufacture and the time required for positioning and fixing the sensor in the predetermined angular position and axial position are minimized.
SUMMARY OF THE INVENTION
The special features of the present invention include the design of the sensor-accommodating housing, above all, the design of the flange on the insertion side of the housing, and the shaping of the corresponding flange formed on the sensor. Due to the shaping, the accommodating housing can be produced particularly simply and with little effort, for example, as a deep-drawn sheet-metal part, and can be machined by punching recesses, etc. When the sensor is inserted into the sensor-accommodating housing, positioning in the predetermined angular position and resilient engagement of the flanges and, consequently, reliable retaining in the exactly predetermined angular and axial positions is automatically ensured.
Further advantages, features and possible applications of the present invention can be taken from the following description of embodiments and details, making reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal cross-sectional view of a wheel bearing including a sensor accommodation and an inserted sensor according to an embodiment of the present invention.
FIG. 1A is a side view and end view of the sensor of the present invention.
FIG. 2 is an enlarged view of a flange portion of the sensor-accommodating housing forming part of the wheel bearing depicted in FIG. 1.
FIG. 3 is an enlarged partial cross-sectional view of showing a point of connection between a flange of the sensor-accommodating housing and a flange of the sensor in the embodiment depicted in FIG. 2.
FIG. 4 is a schematic, cross-sectional, unwound view of the ci
REFERENCES:
patent: 4125339 (1978-11-01), Pittinger, Sr. et al.
patent: 5145276 (1992-09-01), Demange
German Patent Application No. G9010131.6 dated Dec. 6, 1990.
Japanese Patent Application No. 63-166601.
de Witte Andre
Goossens Andre F. L.
ITT Manufacturing Enterprises Inc.
Patidar Jay
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