Hydraulically damped rubber cartridge spring

Claim 1

In a hydraulically damping rubber cartridge spring comprising an inner tube; a rigid ring body; an intermediate tube; an outer tube which surrounds and supports the latter elements; and a spring body consisting of rubber vulcanized around the inner tube, said spring body forming two chambers situated one behind the other in the direction of the forces to be applied, the chambers being separated by a flexible dividing wall of said spring body and bounded on opposite sides by flexible end walls of said spring body and by said ring body in the region of their outer circumference, said flexible end walls being surrounded by and affixed adhesively to said intermediate tube; the improvement wherein said intermediate tube comprises two axially separated supporting rings which are limited in extent in their axial direction to the regions surrounding said flexible end walls; wherein said ring body comprises two half shells arranged in the axial space between said two supporting rings and has an outside diameter that is the same as that of said supporting rings; wherein said half shells are provided with supporting surfaces of U-shaped profile extending parallel to said dividing wall; and wherein said supporting surfaces of U-shaped profile envelop said dividing wall in the region of its ends on both lateral sides and in the circumferential direction.