Patent ID: 7264095

Claim:
Vibration and displacement damper, comprising: a plunger piston ( 10 ) sliding inside a guiding cylinder ( 20 ) in a longitudinal direction ( 30 ), the plunger piston comprising, over a part of a length of said plunger piston, a piston ring ( 12 ) sliding with a slight clearance inside a main chamber ( 13 ) provided in said cylinder, said piston ring comprising calibrated through-orifices ( 14 ) for a high-viscosity fluid, such that the variations in ambient temperature have little effect on damping efficiency, the fluid filling said chamber on both sides of said piston ring, said cylinder comprising, on either side of said main chamber ( 13 ) in the longitudinal direction, two secondary chambers ( 15 , 16 ) that the plunger piston enters, said secondary chambers being filled, at least in part, by said high-viscosity fluid and comprising limiting means ( 19 , 21 ) for limiting the passage or leakage of fluid from the main chamber toward the secondary chambers, and for facilitating the leakage of fluid from at least one of the secondary chambers toward the main chamber, wherein said fluid has a viscosity greater than 500cSt, wherein the damper comprises a conduit ( 27 ) provided in the piston and opening ( 28 , 29 ) into each of the secondary chambers ( 15 , 16 ), wherein the damper further comprises at least one through-path ( 17 , 18 ) provided in the cylinder in which is inserted said limiting means ( 19 , 21 ) for limiting the passage or leakage of fluid from said main chamber toward the secondary chambers, and wherein one of the secondary chambers ( 16 ) communicates with a complementary chamber ( 24 ) via at least two holes ( 25 ), which complementary chamber ( 24 ) contains an air volume ( 31 ), and wherein said one secondary chamber ( 16 ) is connected ( 27 ; 28 ; 29 ; 33 ) to the other secondary chamber ( 15 ) such that the high viscosity fluid circulates freely between the two secondary chambers ( 15 , 16 ).