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US 5,343,759 AGranted
Sensor system
AssigneeSKF Nova AB
InventorsTore Hesthamar, Fredrik Althoff, Thomas Larsson, Bram Veenhuizen
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Abstract
The invention relates to a sensor system for measuring e.g. the preloads in screws, bolts or similar. It comprises sensor means (2) comprising a magnetoelastic material (6) sensitive to the preloads to which the object is exposed and a sensing device (3) comprising a contact portion (4) and gripping portion (5). The contact portion is so arranged that it at least partly surrounds the sensor means (2) and the magnetoelastic material (6) is excited with an excitation frequency of at least 300 kHz.
Claims17
A sensor system for measuring stress on a bolt having a nut, comprising:
- a sensor comprised of a magnetoelastic material;
- a sensing device comprising a contact portion for at least partly surrounding said sensor, and a gripping portion extending from said contact portion;
- wherein said sensor is positioned between an object being fastened and said nut such that said sensor senses compressive forces created between said nut and said object;
- and
- an electronic system connected to said sensing device for monitoring loads sensed by said sensor.
2 more elements
Dependencies are inferred from the claim text.