The present invention relates to a hydraulic damper (1), in particular a motor vehicle hydraulic suspension damper, comprising a tube (2) filled with working liquid, a main piston assembly (3) disposed slidably inside the tube (2), attached to a piston rod (4) led outside the damper (1) through a sealed piston rod guide (5) and dividing the tube (2) into a rebound chamber (7) and a compression chamber (9), rebound (31) and compression (32) valve assemblies to control the flow of working liquid within the tube (2) during rebound and compression stroke of the damper (1), wherein at least one end of the tube (2) is provided with an additional stroke stop arrangement (11) comprising a narrowed section (124) of a diameter smaller than the diameter of the tube (2), having an Inlet (125) opening to the tube (2) and provided at least partially with at least one axial groove (122) having the cross-sectional area decreasing from said inlet (125) along said narrowed section (124), a spring (14) disposed at least partially in said narrowed section (124) of the tube (2) and secured to said at least one end of the tube (2), and an additional piston assembly (13) having a diameter smaller than the diameter of the tube (2), displaceable along with the main piston assembly (3) apt to be slidably disposed in said narrowed section (124) of the tube (2) and apt to engage said spring (14) to generate additional damping force. In order to provide a tunable and smooth increase of damping force at the end of the stroke said additional piston assembly (13) is further provided with a shaped sleeve (134) distal with respect to the main piston assembly (3), a sealing ring (133) apt to make a sliding fit with the Internal wall of said narrowed section (124) of the tube (2), and a supporting sleeve (132) proximal with respect to the main piston assembly (3), wherein the sealing ring (133) surrounds an inner axial rim (1343) of the shaped sleeve (134) and is axially displaceable between the supporting sleeve (132) and an outer axial rim (1344) of the shaped sleeve (134) and wherein the Inner axial rim (1343) defines at least one axial channel (1341) in fluid connection with at least one radial channel (1342) defined In the outer axial rim (1344).
HYDRAULIC SUSPENSION DAMPER WITH A HYDRO-MECHANICAL STROKE STOP
HYDRAULISCHER AUFHÄNGUNGSDÄMPFER MIT HYDROMECHANISCHEM HUBANSCHLAG
AMORTISSEUR DE SUSPENSION HYDRAULIQUE AVEC UNE BUTÉE DE COURSE HYDROMÉCANIQUE
2018-10-10
Patent
Elektronische Ressource
Englisch
Hydraulic suspension damper with hydro-mechanical stroke stop
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