VARIABLE-DAMPING HYDRAULIC SHOCK-ABSORBER FOR A VEHICLE SUSPENSION

摘要

The shock-absorber (10) comprises a cylindrical body (12) and a rod (14), wherein the body (12) comprises an inner cylindrical tube (16) and an outer cylindrical tube (18) which enclose a reservoir chamber (20) containing oil. A piston (22) is slidably mounted in the inner cylindrical tube (16) and divides the internal volume of that tube (16) into a rebound chamber (24) and a compression chamber (26). The body (12) further comprises an intermediate cylindrical tube (36) which is arranged around the inner cylindrical tube (16) and encloses with the latter an intermediate chamber (38) in fluid communication with the compression chamber (26). The shock-absorber (10) further comprises a first electronical- ly-controlled valve (40) and a second electronically-controlled valve (42) which are arranged to adjust the flow of the damping fluid between the rebound chamber (24) and the compression chamber (26), as well as between the compression chamber (26) and the res- ervoir chamber (20), during the rebound phase and during the compression phase, respectively. The first electronically-controlled valve (40) is arranged inside the body (12) of the shock-absorber (10), namely inside the inner cylindrical tube (16), so as to be drivingly connected with the rod (14), and is hydraulically connected on the one hand with the re- bound chamber (24) and on the other with the compression chamber (26) to adjust, during the rebound phase, the flow of the damping fluid from the rebound chamber (24) to the compression chamber (26). The second electronically-controlled valve (42) is arranged outside the body (12) of the shock-absorber (10) and is hydraulically connected on the one hand with the reservoir chamber (20) and on the other with the intermediate chamber (38) to adjust, during the compression phase, the flow of the damping fluid from the compression chamber (26) to the reservoir chamber (20) via the intermediate chamber (38).