Torsional damper with a sealed annular housing, especially for a motor vehicle

A torsion damper, comprising a first element (12) and a second element (14) coaxial with each other and defining between them a sealed annular housing (30), which receives, firstly, a circumferentially acting resilient damping means (32) interposed between the two rotating elements (12, 14), and secondly, a lubricating agent for said resilient damping means, wherein the annular housing (30) is defined by at least two components (20, 34) of the first of the rotating elements (12, 14), while the second rotating element comprises a disc (36) which penetrates into the housing, and wherein sealing members (52A, 52B-152A, 152B-252A, 252B) delimit the annular housing (30) radially inwardly, said sealing members (52A, 52B) comprising two coaxial sealing rings (52A, 52B-152A, 152B . . . ), disposed on either side of the disc (36) of the second rotating element (14), and each of which is in engagement through one of its surfaces (64A, 64B) against a support surface (66A, 66B . . . ) associated with the disc (36) of the second rotating element, and through its other surface (62A, 62B) against a support surface (60A, 60B) associated with the first rotating element, wherein each sealing ring (52A, 52B) is mounted axially directly between its two support surfaces in such a way as to have the form of a frustum of a cone, and is arranged to bear sealingly, through one of its circular edges (50A, 54B . . . ), against a shoulder (56A, 56B . . . ) formed in facing relationship on one of the elements comprising the first rotating element (12) and the disc (36) of the second rotating element, and through its other edge on an annular ridge (66A, 66B . . . ) formed in facing relationship with the other one of the elements comprising the first rotating element (12) and the disc (36) of the second rotating element (14), in that each each annular ridge (66A, 66B , . . . ) is offset axially with respect to said shoulder (56A, 56B . . . ), and in that said sealing rings (52A, 52B) are substantially parallel.