NIDANCHOSETSUYORYUTAIKANSHOKI

摘要

A double effect hydraulic shock absorber includes a system for varying the resistance of the compression cycle of the shock absorber. Two different compression loads are obtained by joining the inner chamber of the shock absorber to the outer annular chamber through two groups of exhaust ducts, each of the groups of exhaust ducts being controlled by unidirectional valves set at different pressures or strengths. The ducts set at a lesser pressure are provided with a blocking device capable of closing such ducts, thus leaving as the only outlet for the expelled oil the ducts set at a higher pressure. The blocking device includes an electromagnet which axially activates the blocking element, thus closing or leaving free the inlet of the weak exhaust ducts.