Steering coupling structure having cylindrical bushing with hollow portions

A steering coupling structure including a cylindrical bushing mounted in a transmission line of a steering force in a steering system of a motor vehicle, such that a longitudinal axis of said bushing extends in a direction substantially perpendicular to an axis of rotation of said steering system, said steering system including an input shaft and an output shaft, said cylindrical bushing comprising:

• an inner sleeve connected to one of said input and output shafts of said steering system;
• an outer sleeve disposed radially outwardly of said inner sleeve and connected to the other of said input and output shafts;
• and
• an annular elastic body interposed between said input and output sleeves for elastic connection thereof, said elastic body including diametrically opposed solid portions formed on opposite sides of said inner sleeve, said solid portions being opposed to each other in a diametric direction of the elastic body which is perpendicular to said axis of rotation of said steering system, and diametrically opposed hollow portions formed on opposite sides of said inner sleeve such that said hollow portions extend in an axial direction of the bushing between said inner and outer sleeves, said hollow portions being substantially opposed to each other in a diametric direction of the elastic body which is parallel to said axis of rotation of said steering system.