Hydraulic inertial vibration isolator

F - Mech Eng,Light,Heat,Weapons – 16 – F

Patent

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Details

F16F 7/10 (2006.01)

Patent

CA 2186453

A hydraulic inertial vibration isolator (1) is connected between a vibrating body (3) and an isolated body (5). The vibration isolator (1) comprises a cylinder (7) which includes two chambers (35, 37) and a piston (9) therebetween. The chambers (35, 37) are connected by a tuning passage (31) in which a solid tuning slug (33) is slidably disposed. The chambers (35, 37) and the tuning passage (31) are filled with liquid. Bypass passages (57, 61) connecting the tuning passage (31) to the chambers (35, 37) allows file liquid pressure in the chambers (35, 37) to equalize when the amplitude of the tuning slug's oscillatory motion is sufficiently large, thereby limiting the tuning slug's amplitude. Dashpots (45, 47) axially disposed adjacent to either end of the tuning slug (33) act to damp excessive tuning slug motion and to bias the tuning slug (33) toward the center of the tuning passage (31). An electronic control system (69) is used to supply alternate current to magnetic coils (67) adjacent to the tuning slug (31), thereby matching the isolation frequency to the vibration frequency.

Un affaiblisseur (1) de vibration inertiel hydraulique est connecté entre un corps vibrant (3) et un corps isolé (5). Cet affaiblisseur (1) de vibration comprend un cylindre (7) pourvu de deux chambres (35, 37) entre lesquelles est positionné un piston (9). Les chambres (35, 37) sont reliées par un passage (31) de syntonisation dans lequel est placé coulissant un tampon solide (33) de syntonisation. Les chambres (35, 37) et le passage (31) de syntonisation sont remplies de liquide. Des passages de dérivation (57, 61) reliant le passage (31) de syntonisation aux chambres (35, 37) permettent à la pression du liquide de s'équilibrer lorsque l'amplitude du mouvement oscillatoire du tampon de syntonisation est suffisamment importante, ceci ayant pour effet de limiter l'amplitude dudit tampon de syntonisation. Des amortisseurs à fluide (45, 47) placés axialement adjacents à une des extrémités du tampon de syntonisation (33) amortissent le mouvement excessif du tampon et l'orientent vers le centre du passage (31) de syntonisation. Un système de commande électronique (69) sert à envoyer du courant alternatif aux bobines magnétiques (67) adjacentes au tampon de syntonisation (33), ceci ayant pour résultat d'adapter la fréquence d'affaiblissement à la fréquence de vibration.

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