Hydraulic damper with a hydraulic stop arrangement

A damper assembly comprising;

• a main tube disposed on a center axis and extending between a first end and a second end defining a fluid chamber for containing a working fluid;
• a main piston slidably disposed in said fluid chamber dividing said fluid chamber into a rebound chamber and a compression chamber with said compression chamber being between said first end and said main piston and said rebound chamber being between said second end and said main piston;
• a piston rod disposed on said center axis and attached to said main piston for moving said main piston between a compression stroke and a rebound stroke;
• an additional piston attached to said piston rod adjacent to said main piston for providing additional damping force;
• said additional piston including a body having an upper member and a lower member and defining a groove between said upper member and said lower member;
• a sealing ring disposed in said groove between said upper member and said lower member for movement in said groove with said sealing ring being radially expandable in response to a working fluid pressure to engage said main tube during said compression stroke and said rebound stroke;
• and
• said sealing ring including an outer surface facing said main tube, an upper surface facing said upper member, and a lower surface facing said lower member and at least one annular collar extending outwardly from said sealing ring for forming a locking engagement with said upper member and said lower member to limit the radial expansion of said sealing ring.