Measuring and testing – Probe or probe mounting
Patent
1992-06-12
1994-07-05
Williams, Hezron E.
Measuring and testing
Probe or probe mounting
73494, 32420725, G01D 2100, G01P 102, G01B 714
Patent
active
053257340
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for positioning a sensor with respect to a body, with a spacing being precisely adjusted between the sensor and the body.
A holding device of that kind is known from DE 36 18 528 A1. The sensor provided in that case serves as a detector of the rotational speed of a vehicle wheel (as does the preferred embodiment of the instant invention) and is used for ABS control (anti-lock control).
Sensors employed in ABS systems for measuring the rotational behavior of the wheels in most cases operate according to the principle of electromagnetic induction. A pole wheel formed with teeth around its circumference rotates with respect to a stationary sensor (coil with an iron core) and tension is induced in the coil as the pole wheel moves. Attempts are made to keep the distance between the pole wheel and the sensor as small as possible.
Typically, the air gap between the sensor housing and the pole wheel is approximately 0.5 mm wide. This already is within the range of manufacturing tolerance of the structural members and the mounting accuracy.
A sensor which is to be adjustable accurately and reliably is known from DE 36 18 528 A1, mentioned initially. A holding device for a signal transmitter which is said to be adapted for easy mounting is known from DE 33 32 545 A1 which, however, is not concerned with the positioning of the signal transmitter in relation to a body which is independent of the holding device for the signal transmitter.
The instant invention has for its aim to provide a holding device for positioning a sensor with respect to a body which holding device permits easy adjustment of the spacing between the sensor and the body and still operates reliably during a long service life under high stress (environmental influences, shock and acceleration stresses) and yet can be produced economically.
What is provided to solve this problem is a spring which biases the sensor in the direction of the body and an adjusting member which is movable between at least two positions and which, when being moved from the first to the second position, moves the sensor against the bias of the spring such that the sensor becomes located at the desired spacing from the body.
(Other than the prior art according to DE 33 32 545, for example) the instant invention thus is aimed at providing a device which not only holds the sensor but also adjusts it above all with respect to a body, such as a pole wheel. To accomplish that, it is preferably provided that, in mounting the device according to the invention by placing the sensor on the body (e.g. the pole wheel), first all the tolerances of the structural members are compensated by means of a fastening screw.
The holding device according to the invention is preferred for positioning a rotational speed sensor with respect to a pole wheel which is connected to a rotating vehicle wheel, being used in the context of an ABS control system. With this application of the invention, the term "stationary" is equivalent in meaning to "fixed to the vehicle". According to a particularly preferred modification of the holding device according to the invention it is provided for the adjusting member, upon moving from the first to the second position, to alter its distance from a stationary support, especially in accordance with the desired spacing between the sensor and the body.
In moving between its positions, the adjusting member can carry out translatory and/or rotational movements. Preferably, the adjusting member is embodied by a pivotable lever which carries out rotary motions between the two positions.
According to another preferred modification of the holding device according to the invention it is provided that the adjusting member is biased by a spring in the direction of the stationary support and engages a stop which is firmly connected to the sensor.
An exceptionally compact (space-saving) structure of the overall arrangement of the holding device, the sensor, etc. is achieved if the stationary support comprises a support body adapted to be mounted s
REFERENCES:
patent: 2780094 (1957-02-01), Fink
patent: 3778692 (1973-12-01), Angersbach et al.
patent: 5018384 (1991-05-01), Hayashi et al.
IBM Technical Disclosure Bulletin, vol. 11, No. 9, Feb. 1969, New York, Rigotti, J. M., Adjustable Transducer.
Larkin Daniel S.
Lucas Industries Public Limited Company
Williams Hezron E.
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