HYDRO-MECHANICAL STOP HAVING A RESTRICTIVE PASSAGE

摘要

A shock absorber (10) has a rebound stop assembly (22). The rebound stop assembly (22) rests upon a shoulder (30) fixed to a piston rod (16). The rebound stop assembly (22) includes an elastomeric ring (24) interposed between two collars (26) and (28) forming an annular chamber (74) therebetween. At the end of the rebound stroke of piston rod (16), the rebound stop assembly (22) is axially compressed between the shoulder (30) of piston rod (16) and the rod guide (18) until the elastomeric ring (24) deforms to abut the inner wall (64) of the working cylinder. As the elastomeric ring deforms, the annular chamber decreases in volume. A restrictive passage (71) allows a restrictive flow of fluid therefrom. An additional chamber (70) is formed which is in restrictive fluid communication through the passage (71) with section (68) of rebound chamber (20). Further compression of the stop assembly (22) decreases the volume of both chambers (70 and 74), and causes restrictive fluid flow out therefrom through the passage (71) into the section (68) of rebound chamber (20). The compression of the elastomeric ring and the restrictive fluid flow provides additional damping at the end of the rebound stroke.