Patent ID: 9091319
Filing Date: 2015-07-28
Classification: F16F

Abstract:
1. Hydraulic shock absorber comprising: a solid main piston, impervious to damping medium, which is fixed to a first part of a piston rod and is designed to slide in a damping cylinder parallel to the movement generated when the shock absorber is subjected to a compression or a rebound stroke, the main piston dividing the damping cylinder into a first damping chamber containing the piston rod and a second damping chamber which does not contain the piston rod; an outer tube which is arranged around the damping cylinder and is defined at its first end by a first fixing element having an inner surface facing towards the second damping chamber; a pressurization reservoir divided by a separating member to define a third chamber filled with damping medium pressurized by a force acting on the separating member, the pressurization reservoir being connected to the first fixing element but arranged radially outside the outer tube; a fourth defined chamber arranged in the first fixing element and hydraulically connected via a first flow duct to the first damping chamber, hydraulically connected via a second flow duct to the second damping chamber, and hydraulically connected to the third chamber, the first flow duct having a first flow duct diameter which increases to define a first valve chamber and the second flow duct having a second flow duct diameter which increases to define a second valve chamber; and two separate, adjustable valves, arranged in the first and second valve chambers respectively, and designed to generate a damping force acting in opposition to the stroke movement by restricting a damping medium flow between the damping chambers.