SENSOR PACKAGE FOR WIM SENSOR AND WIM SENSOR

• US 20140345955A1
• Filed: 01/11/2013
• Published: 11/27/2014
• Est. Priority Date: 01/11/2012
• Status: Active Grant

• Current Assignee: Kistler Holding AG
• Original Assignee: Kistler Holding AG
• Inventors: Cornu, David, Hofmann, Adrian, Frei, Peter
• Granted Patent: US 9,372,110 B2
• Time in Patent Office: Days
• US Class Current: 177/180
• CPC Class Codes: G01G 19/024 using electrical weight-sensitive devices
• CPC Class Codes: G01G 21/28 Frames, Housings
• CPC Class Codes: G01G 3/13 having piezoelectric or piezoresistive properties

Abstract

The invention relates to a sensor package (6) with long design for a WIM (Weigh in Motion) sensor (1), comprising a first receiving plate (7), a plurality of measuring elements (10), which are arranged equally spaced in a row (15) on the upper side (9) of the first receiving plate (7), an electrode (11) covering all the measuring elements (10), insulation (12) completely covering the electrode (11), and a second receiving plate (8), which covers the insulation (12). In particular, each receiving plate (7, 8) consists of a plurality of receiving elements (13) the end faces (14) of which are juxtaposed in a row (15). According to the invention, the inner end faces (14) of the receiving elements (13) of at least one row (15) have profiles (16) which engage in a form fit manner with the profiles (16) of the adjacent end faces (14) of neighbouring receiving elements (13). The invention further relates to a WIM sensor (1) comprising a hollow profile (3) with a tube (4) and two opposing mountings (5) arranged therein, between which a sensor package (6) according to the invention is arranged under initial tension.

Claims

1. Sensor package with long design for a WIM (Weigh In Motion) sensor comprising a first receiving plate, a plurality of measuring elements which are arranged equally spaced in a row on the upper side of the first receiving plate, an electrode that at least indirectly covers all the measuring elements, an insulation that completely covers the electrode, and a second receiving plate which at least indirectly covers the insulation, wherein each receiving plate is defined by a plurality of discrete receiving elements, the end faces of which are juxtaposed in a row, wherein the inner end faces of the receiving elements have at least one row of profiles that engage in positive locking manner in the profiles of the adjacent end faces of adjacent receiving elements.

2. Sensor package according to claim 1, wherein all receiving elements of a row are identical to each other.

3. Sensor package according to claim 1, wherein the receiving elements are made from stainless steel.

4. Sensor package according to claim 1, wherein the receiving elements have a length from 60 to 300 mm, a width from 5 to 25 mm, and a thickness from 1 to 6 mm.

5. Sensor package according to claim 1, wherein the tolerance for thickness and parallelism of all receiving elements is not more than 30 μ

m.

6. Sensor package according to claim 1, wherein the tolerance for flatness of the surfaces of receiving elements, whether facing toward or away from measuring elements, is not more than 50 μ

m.

7. Sensor package according to claim 1, wherein the roughness of the surfaces of the receiving elements adjacent to the measuring elements has a value not exceeding Ra 1.6.

8. Sensor package according to claim 1, wherein all receiving elements are of identical design.

10. Sensor package according to claim 4, wherein the receiving elements have a length from 100 to 150 mm.

11. Sensor package according to claim 4, wherein the receiving elements have a width from 8 to 15 mm.

12. Sensor package according to claim 4, wherein the receiving elements have a thickness from 2 to 2.5 mm.

13. Sensor package according to claim 1, wherein the receiving elements have a length from 100 to 150 mm, a width from 8 to 15 mm, and a thickness from 2 to 2.5 mm.

9. WIM sensor comprising a hollow profile, a tube and two mountings disposed opposite to one another in the hollow profile, a sensor package arranged under initial tension within the tube and between the two mountings, the sensor package including a first receiving plate, a plurality of measuring elements which are arranged equally spaced in a row on the upper side of the first receiving plate, an electrode at least indirectly covers all the measuring elements, an insulation that completely covers the electrode, and a second receiving plate which at least indirectly covers the insulation, wherein each receiving plate is defined by a plurality of discrete receiving elements, the end faces of the receiving elements are juxtaposed in a row, wherein the inner end faces of the receiving elements have at least one row of profiles that engage in positive locking manner in the profiles of the adjacent end faces of adjacent receiving elements.