Hydrokinetic coupling device, particularly for a motor vehicle

Hydrokinetic coupling apparatus (10), especially for a motor vehicle, of the type comprising, considered axially from front to rear:

• a casing (12) consisting of a rear shell (20) which is adapted to be coupled in rotation to a driving shaft, an impulse wheel (30), and a front shell (18);
• a turbine wheel (32), which is arranged for rotation with a turbine hub (40), which is adapted to be coupled in rotation to a driven shaft (A);
• a lock-up clutch (16) for coupling the driving shaft and the driven shaft together,
• which is operatively interposed between the turbine wheel (32) and the rear shell (20) and comprises a piston (48), which is movable axially for releasably coupling together the rear shell (20) and the driven shaft (A), and which includes a damping device (50),
• the damping device (50) comprising at least one guide ring (72) which constitutes the input element, a damper plate (74) constituting the output element, and circumferentially acting elastic members (76) interposed between the input element (72) and output element (74), which are coupled together in rotation but with the ability to perform predetermined circumferential displacement,
• and of the type in which the turbine wheel (32), the turbine hub (40) and the damper plate (74) of the damping device (50) are coupled in rotation by means of rigid joints,
• characterised in that the damper plate (74) comprises at its inner radial end a flange portion (86) which extends axially forward between the turbine wheel (32) and the turbine hub (40), and which is coupled in rotation, by friction welding, respectively:
• at the front, to the turbine wheel (32) by means of a first welded joint (88) formed between an annular front contact face (90) of the flange portion (86) and a rear weld face (92) in facing relationship with the inner radial periphery of the turbine wheel (32), and
• at the rear, to the turbine hub (40) through a rear second welded joint (96) formed between an annular rear contact face (98) of the flange portion (86) and a front weld face (100) in facing relationship with the outer radial periphery of the turbine hub (40).