Saddle lock ring for rear dual wheels of heavy transport vehicle

A rear dual wheel assembly with a self-locking mechanism for use in a heavy transport vehicle, comprising:

• an axle hub, an inboard wheel assembly and an outboard wheel assembly provided at both sides of the heavy transport vehicle;
• wherein the outboard wheel assembly comprises:
• a flange for connecting a wheel rim to the axle hub;
• a bead flange provided in an inner bead seat portion of the outboard wheel assembly;
• a removable bead seat provided in the inner bead seat portion;
• an O-ring provided at the inner bead seat portion of the outboard wheel assembly;
• an endless ring provided in the inner bead seat portion;
• a two-piece segmented saddle lock ring provided in the inner bead seat portion;
• wherein the two-piece saddle lock ring includes a body, wherein the body includes a first shoulder portion, wherein the body tapers along a top surface thereof towards a spaced and opposed second shoulder portion, wherein the second shoulder portion has a height lower than the first shoulder portion relative to a planar bottom surface of the body;
• a self-locking taper provided at an interface with the endless ring;
• a relief provided on an inner surface of the endless ring;
• and
• wherein the second shoulder portion is operable to engage a surface of the endless ring, thereby preventing unlocking of the two-piece segmented saddle lock ring and falling out of the wheel assembly.