Multi-axis load cell

Details Multi-axis load cell Multi-axis load cell

G - Physics

01

L

G01L 5/16 (2006.01) G01L 1/22 (2006.01) G01L 1/26 (2006.01) G01L 5/20 (2006.01)

Patent

CA 2264827

A load cell body (10, 10') for measuring components of force and moment in plural direction includes an integral assembly having a rigid central hub (14) and a rigid annular ring (16) concentric with the central hub (14). At least three radial tubes (21, 22, 23, 24) extend radially along corresponding longitudinal axes (21A, 22A, 23A, 24A) from the central hub (14) to the annular ring (16). Flexure members (31, 32, 33, 34) join the radial tubes (21, 22, 23, 24) to the the annular ring (16). Each flexure member (31, 32, 33, 34) is compliant for displacemnt of each corresponding radial (21, 22, 23, 24) tube along the corresponding longitudinal axis (21A, 22A, 23A, 24A). As a load cell (10, 10'), a strain sensor (44, 46, 48) mounted on each radial tube (21, 22, 23, 24) measures strain therein.

L'invention concerne un corps de capteur de force (10, 10') permettant de mesurer des composantes de force et de moment dans plusieurs directions, qui comprend un ensemble intégré à moyeu central rigide (14) et à bague annulaire rigide (16) concentrique par rapport au moyeu central (14). Au moins trois tubes radiaux (21, 22, 23, 24) s'étendent de manière radiale le long des axes longitudinaux correspondants (21A, 22A, 23A, 24A), depuis le moyeu central (14) vers la bague annulaire (16). Des éléments de flexion (31, 32, 33, 34) rattachent les tubes radiaux (21, 22, 23, 24) à la bague annulaire (16). Chacun de ces éléments de flexion (31, 32, 33, 34) est conçu pour assurer le déplacement de chaque tube radial correspondant (21, 22, 23, 24) le long de l'axe longitudinal correspondant (21A, 22A, 23A, 24A). Tenant lieu de capteur de force (10, 10'), un capteur extensométrique (44, 46, 48) monté sur chacun des tubes radiaux (21, 22, 23, 24) mesure la contrainte interne des tubes.

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