Hydraulic suspension damper

摘要

The invention relates to a hydraulic damper (1), in particular for the suspension system of a motor vehicle comprising a tube (2) filled with working liquid, inside of which a slidable piston assembly (3) is placed. To increase an amount of dissipated energy during extremely fast compression strokes, the damper (1) is provided with an additional compression valve system (17a), preferably in a form of a preassembled add-on device, which is attached to the piston rod (4) in a compression chamber (10) and comprises a hollow main body (18a) surrounding the piston rod (4) and provided with a substantially flat first abutment surface (19) with a radially inner portion and a radially outer portion defining the close position of the system (17a), and at least one channel (20) the inlet of which is located within the area of the first abutment surface (19), a compression spring (24) supported within the hollow main body (18a) underneath the first abutment surface (19), a substantially rigid and relatively thin plate (26a) biased by the spring (24) against a second abutment surface (27) defining the open position of the system (17a), wherein the plate is free to deflect and displace between said open position and said close position, and the outside diameter of said hollow main body (18a) is less than the inner diameter of the tube (2) and the hollow main body (18a) is provided with an annular groove (21) inside of which a cross-cut ring (22) is disposed to form a sliding fit of the hollow main body (18) within the tube (2).

主权项

1. A hydraulic damper (1) for a motor vehicle suspension damper, comprising:
a tube (2) filled with working liquid and having an inner surface (8) to define an inner diameter of the tube (2); a piston rod (4) disposed within said tube and extending along a damper longitudinal axis (L); a piston assembly (3) attached to said piston rod (4) and disposed in abutting relationship with said inner surface (8) of said tube (2) to divide said tube (2) into a rebound chamber (9) and a compression chamber (10); an additional compression valve system (17) attached to said piston rod (4) and disposed in said compression chamber (10); said additional compression valve system (17) including a hollow main body (18) surrounding the piston rod (4) having an outside diameter less than said inner diameter of said tube (2); said hollow main body (18) defining an annular groove (21) extending inwardly from said outside diameter; a ring (22) disposed within said annular groove (21) and self-biased in abutting relationship with said inner surface (8) of said tube (2) to seal said hollow main body (18) within said tube (2) and form a sliding fit therebetween; said ring including a cross cut (221) to allow displacement of said ring (22) within said annular groove (21) along a plane extending perpendicular to said damper longitudinal axis (L); said annular groove having a top wall, a bottom wall, and a side wall extending between said top and bottom walls in continuous parallel relationship with said damper longitudinal axis (L); and said ring (22) disposed in spaced relationship with said side wall of said annular groove (21) to define a gap extending continuously between said sidewall of said annular groove (21) and said ring (22) and disposed in isolated relationship with said rebound chamber (10).