Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1985-03-06
1987-03-24
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
310168, 339147R, G01P 102, G01P 3488
Patent
active
046528180
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an electric measuring instrument with a connecting cable.
BACKGROUND
In a known bar sensor as a measuring instrument, the electric coil is wound on a coil form in which a flow conductor piece with a permanent magnet has been inserted (DE-PS No. 24 10 630). At the forward face of the bar sensor is a pole shoe which interacts with a revolving sprocket ring on a wheel, to measure the driving speed of a motor vehicle. The electrical connection of the coil is made via two conductor rails at whose one end there is contact with a coil connection, and at whose other end there is contact with a conductor strand of a connector cable. The connecting end of the cable and of the other bar sensor components is spray-coated with plastic. The disadvantage of such solutions is that all functionally important tests of the measuring device, such as measuring the signal voltage, the coil resistance, the insulation test, and the dimensions of the sensor, can only be made when the connecting cable is already connected with the conductor rails. Because of this, the sensor is very difficult to handle in the course of manufacturing as well as in testing. Thus all the testing and manufacturing processes cannot be fully automated.
The present solution is an attempt to perform all manufacturing stages and all functionally important tests of the measuring device as automatically as possible, without being obstructed by the connecting cable.
THE INVENTION
The measuring instrument according to the invention has the advantage that the manufacturing as well as functional testing of all essential parts of the measuring instrument can be carried out without connecting cables, and therefore automatically. It is also considered an advantage that the essential parts of the measuring device can be assembled as a prefabricated component only after the functional tests in a final manufacturing stage, together with the connector piece--including the connecting cable end--which forms another component.
It is particularly advantageous if--after contacting the conductor ends of the connector piece with the conductor rails--the two prefabricated components of the measuring instrument are joined by a flange of the housing in such a way that they are interlocking and moisture-proof. It is practical to fold the conductor rails--whose end contacting the connector piece is projecting from the housing when extended--when the two components are joined.
DRAWING
An embodiment of the invention is shown in the drawing and described in detail below.
FIG. 1 shows a bar sensor as a measuring instrument according to the invention, in cross-section, before the two components are joined, and
FIG. 2 shows the completed bar sensor formed by joining the components by means of a flange.
DETAILED DESCRIPTION
In the figures, a bar sensor for measuring the rotational speed of a motor vehicle wheel (not shown) is identified as number 10. This bar sensor 10 interacts with a sprocket ring (11) fastened to the wheel and rotating in the direction of the arrow; FIG. 2 shows only a fragment of this sprocket ring with a few teeth (12). The bar sensor (10) shown in FIG. 1 in cross-section before the final assembly is made has an electric coil (13) on a coil form (14). Inside this coil 13, in an associated opening of coil form 14, a flow conductor piece (15) has been inserted whose forward end at the forward face of the bar sensor (10) holds a tooth-shaped pole shoe (16). At the rear face of the flow conductor piece (15) which is made of soft magnetic material is a permanent magnet (17) made of hard magnetic material; the surfaces of permanent magnet 17 and of flow conductor piece 15 facing each other are mating over a large area. Permanent magnet 17 interlocks with an upper portion (14a) of coil form 14. This portion (14a) of coil form 14 also holds two conductor rails (18), although only the forward rail is shown in the figures. Each conductor rail (18) is in contact with one end of coil 13 situated in a groove (19) of coil form 14. Coil form 14
REFERENCES:
patent: 2891103 (1959-06-01), Swengel
patent: 3041483 (1962-06-01), Ebbinghaus
patent: 3793545 (1974-02-01), Leiber
Buchschmid Emil
Frenznick Anton
Neidhard Klaus
Robl Gerhard
Eisenzopf Reinhard J.
Robert & Bosch GmbH
Solis Jose M.
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