Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1989-08-18
1991-08-13
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
174 522, 174 65G, 32420715, 336 96, 439449, 439467, G01P 344, G01P 3488, H01R 1358, H05K 506
Patent
active
050399420
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a measurement pickup comprising a measuring element and a connection cable. In a known measurement pickup the connection cable is enclosed with a plastics substance and inserted in a pickup housing opening. The connection cable can accordingly be loosened easily during installation or operation in the housing opening, so that the electrical contacts can rupture. In addition, moisture can penetrate into the interior of the measurement pickup through an occurring clearance and can falsify the measured values and make the measurement pickup unusable, e.g. due to corrosion.
SUMMARY OF THE INVENTION
The object of the invention is to eliminate the foregoing drawbacks of known prior art pickups. The object of the invention is achieved by providing in a measuring pickup a closing part located in the housing opening for fixing the cable therein. The measurement pickup, according to the invention, has the advantage that it is constructed so as to be very simple, robust and inexpensive. The connection cable is fastened in the connection opening of the housing in all directions by the closing part or closing end. It is secured against pulling and pushing in its axial direction and, at the same time, against being pulled out in a direction approximately perpendicular to the axial direction.
The closing part serves for fixing the connection cable and as a boundary part during the sealing or plugging of the housing with plastic material. Moisture is effectively prevented from penetrating into the interior of the measurement pickup by the plastics seal. Costly boundaries for preventing the plastics material from flowing out during the production of the measurement pickup are no longer necessary, so that the measurement pickup is very inexpensive to produce. The parts of the measurement pickup can be combined in several groups which are tested for function already before assembly. Prior to finishing, the sealing of the housing of the measurement pickup, the measurement pickup can easily be tested for overall function.
The projection attached to the inside wall of the housing enables a simple installation and a fixing of the measurement elements which are combined as a group, particularly the coil body. In addition, the measurement elements can not tilt during sealing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal cross-sectional view of measurement pickup, according to the invention;
FIG. 2 shows a top view of the measurement pickup;
FIG. 3 shows a view of the closing part as seen along arrow A in FIG 1;
FIG. 4 shows a view of the closing part as seen along arrow A in FIG. 1, in a mounted state; and
FIG. 5 shows a longitudinal cross-sectional view of a modification of the measurement pickup according to FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A measurement pickup for measuring the number of revolutions of a wheel, not shown, of a motor vehicle is designated by 10 in FIG. 1. The measurement pickup 10 is constructed as an inductive rotational speed sensor and forms a part of an antiskid system of the motor vehicle. It cooperates with a rotating toothed ring 11 which is fastened at the wheel and is shown only in part with several teeth 12. The measurement pickup 10 has a housing 13 which is produced from plastic or metal. It comprises a fastening flange 14 with which it can be fastened at the motor vehicle. A former 16 is arranged in the interior 15 of the housing 13, an electrical winding 19 being arranged at the end of the former 16 facing the base 17 of the housing 13. The winding 19 with the former 16 sits on a pole pin 22 whose front end projects through a central housing opening 23 and is in a operating connection with the teeth 12. The pole piece comprises a soft-magnetic material and the teeth are of a magnetically active material.
At its other end, the pole pin 22 comprises a roughened portion 24 which serves for an improved fastening of the pole pin 22 in the former 16 formed of plastic. A bar-shaped permanent magnet 25 is arrang
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Buchschmid Emil
Ebenhoh Erich
Huber Werner
Moog Michael
Stritzel Berthold
Robert & Bosch GmbH
Strecker Gerard R.
Striker Michael J.
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