Patent ID: 8919505

Claim:
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 ).