Assembly of rim and supporting seat

摘要

The wheel rim for a pneumatic tire, and especially a run-flat tire with little or no pressure, has a tire tread support seating (11) with at least one peripheral projection (115) of a given height (h), which engages a peripheral groove (30) at the inner radial surface of the tire tread support (S). The projection is given axial support against to and fro movements by butting against at least one side wall of the groove. The wheel rim for a pneumatic tire, and especially a run-flat tire, has a peripheral projection with small axial and radial dimensions of 0.005-0.02 times the diameter (DN) of the seating. The maximum diameter (DP) of the projection is at least equal to the diameter (DB) of the axial outer end of the second rim seat (13). The projection has two side surfaces. The side surface towards the first rim seat (13') has a truncated cone shape, where its line forms an angle ( beta ) with the rotary axis of 15-45 degrees . The surface towards the second rim seat has a line which forms an angle ( gamma ) with the rotary axis of 70-90 degrees . The two lines can be joined by a circular arc or a straight segment. The axial gap (V) between the groove surfaces, at the inner rim seat (112), is at most 0.3 times the axial width (l) of the inner radial surface of the tire tread support. The support for the tire tread has a reinforcement (18) of non-stretch elements, divided into two parts. The part which is axially at the side towards the first rim seat is at a gap from it which, at most, is equal to the height of the projection. The part towards the second rim seat is at a radial gap from the tire tread support which is greater than the height of the projection.