Variable resistor for measuring fill level
A resistor, rotary technology, applied in sliding contact resistors, measuring devices, float level indicators, etc., can solve the problem of not being the best, achieve accurate level measurement, reduce wear, and improve the effect of contact
Inactive Publication Date: 2011-07-06
ROBERT BOSCH GMBH
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Problems solved by technology
It turned out that this arrangement of cantilevered conductor sections is not yet optimal with regard to the contacting of the conductor rails
Method used
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Embodiment Construction
[0010] The figure shows a rotary varistor according to the invention, which is designed in particular for measuring the filling level in a container, for example a fuel container.
[0011] The variably adjustable rotary varistor is produced, for example, by means of thick-film technology and is formed on a base plate 1 made of ceramic material. Two arc-shaped sliding contact rails 2 arranged side by side are arranged on the base plate 1 of the rotary varistor. Each curved conductor rail 2 has a geometric center point 4 which, for example, coincides at one point for two conductor rails 2 .
[0012] The first busbar 2.1 is designed like a curved comb and has a plurality of cantilevered conductor sections 3.1 which extend from the main section 5 in the direction of the second busbar 2.2. The cantilevered conductor sections 3 . 1 are connected to one another via the main section 5 . The main section 5 is electrically connected via a first connection section 8.1 to a first signal...
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Variable resistors are known, comprising a carrier plate and two slideways provided on the carrier plate, wherein a first and a second slideway each comprise bridge-shaped conductor sections. The invention provides for a sliding contact, interacting by means of finger-shaped contacts with the slideway. The bridge-shaped conductor sections are disposed such that the imaginary extensions thereof all run through a center, and that said center does not coincide with the pivot point of the sliding contact. According to this embodiment, it is achieved that the contacts of each sliding contact arm are slide in an offset manner across the bridge-shaped conductor sections such that in relation to the conductor sections leading and lagging contacts are present. Thus, a contact is always in electrical contact with the slideway thereof, particularly in case of high vibrations. It has been shown that the arrangement of the bridge-shaped conductor sections in relation to the contacting of the slideways is not ideal yet. The inventive variable resistor improves the contacting of the slideways. According to the invention, the bridge-shaped conductor sections (3.1, 3.2) of the first slideway (2.1)and / or of the second slideway (2.s) are oriented such that the imaginary extensions thereof extend in tangential fashion to a circle (6) having the same center (4) as the associated slideway (2.1, 2.2).
Description
technical field [0001] The invention relates to a rotary variable resistor. Background technique [0002] US 6,127,916 already discloses a rotary varistor with a base plate and two arcuately arranged conductor rails arranged on the base plate, wherein the first and second conductor rails have cantilever-shaped conductor sections . A slider is provided, which interacts with the first slider rail with a first slider arm and with the second slider rail with a second slider arm. The first and second slider arms each have at least two separate contacts that slide on corresponding slider rails. The cantilever-shaped conductor sections are arranged in such a way that their imaginary extensions each run through a center point which does not coincide with the center of rotation of the slider. According to this exemplary embodiment, it is achieved that the contacts of each sliding contact arm slide on the cantilever-shaped conductor section offset from one another in such a way tha...
Claims
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IPC IPC(8): G01F23/36H01C10/32
CPCG01F23/363H01C10/32
Inventor T・策尔曼S・库佩茨P・泽曼Z・托姆科娃M・希斯莱尔D・斯劳普M・菲多尔K・海纳V・斯克日奇罗娃M・洛佩斯
Owner ROBERT BOSCH GMBH