Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1994-08-12
1996-07-23
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
1741261, 324174, 32420715, 336192, 439877, G01P 344, G01P 3488, H01F 2729, H01R 416
Patent
active
055393071
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a conductor bar. More particularly, it relates to a conductor bar for connecting a coil of an inductive sensor to an electric feed. Particularly in conductor bars used in inductive sensors the winding of the coil is wound on the end of the conductor bar facing the coil. This end is then bent away from the coil and fastened, for instance, in locking projections formed at the housing. The locking projections are made of plastic. Because of the difference in material between the conductor bars and locking projections, fluctuations in temperature give rise to different thermal expansions. While plastics enable a sufficiently secure fastening of the end of the conductor bar, their expansion is not sufficient to enable insertion of the end of the conductor bar without wear on the locking projections.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a conductor bar of the above mentioned type, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a conductor bar for an inductive sensor for connecting ends of windings of a coil and an electric feed, wherein in accordance with the present invention the conductor bar has a bent end portion which is fastenable to a winding of a coil, and a bracket which rests on the bent end portion.
When the connector bar is designed in accordance with the present invention, it has the advantage over the prior art that it enables a reliable fastening of the conductor bar. Since the same material is used for the conductor bar and fastening, no relative movements can occur due to fluctuations in temperature. The fastening or catch can be incorporated in the conductor bar in a simple manner during production by a punching die. Since the end of the conductor bar is already bent, the retaining bracket can also be bent in the same work step. Further, there is no critical wall thickness in the region of the fastening.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a sensor in cross section with installed conductor bar;
FIG. 2 shows a conductor bar with punched out securing bracket;
FIG. 3 shows a conductor bar in the process step prior to bending the securing bracket.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A housing of a speed sensor 11 which is produced by injection molding of magnetically nonconducting injection molding compound is designated by 10 in FIG. 1. An elongated coil body 13 with a coil 14 having a winding is inserted into the housing 10. The winding of the coil 14 is connected to two conductor bars 15 (shown one behind the other in the drawing) which are arranged in longitudinal grooves 16 of the coil body 13. The upwardly projecting free ends 17 of the conductor bars 15 are connected, e.g. welded or soldered, with a conductor 18 of a two-wire connection cable 19 for picking up signals. The end portion 21 of the conductor bars 15 on the coil side is bent and projects away from the coil 14. However, the bend 22 of the conductor bars 15 produced in this way is as near as possible to the coil shield 23 of the coil body 13. By coil shield is meant the two boundaries for the coil 14 formed at the coil body. The respective end, i.e. the beginning or end 14a, of the winding of the coil 14 is fastened to the end portions 21 of the conductor bars 15. A pole pin 25 is arranged in the coil body 13 in the region of the winding. This pole pin 25 is in a working connection with a gear wheel or other rotating part, not shown in the draw
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Bischof Rolf
Weyrich Gerd-Uwe
Robert & Bosch GmbH
Strecker Gerard R.
Striker Michael J.
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