Patent ID: 7191879

Claim:
A hydrokinetic coupling apparatus for coupling together a driving shaft and a driven shaft, the hydrokinetic coupling apparatus comprising: a casing ( 14 ) coupled to the driving shaft in rotation to an impulse wheel, a hub ( 16 ) coupled to the driven shaft and a turbine wheel ( 18 ), a lock-up clutch ( 34 ) for locking the coupling of the driving and driven shafts, the clutch comprising: a movable locking piston ( 36 ) which is displaceable axially between a wall ( 38 ) delimiting the turbine wheel ( 18 ) and a substantially radial locking wall ( 20 ) of the casing ( 14 ), against which the piston ( 36 ) is biased for locking the coupling, sealing means between two hydraulic chambers ( 50 , 52 ) which are separated by the piston ( 36 ), the sealing means having a female member ( 42 ), coupled to the piston ( 36 ) and sliding axially around a complementary male member ( 44 ) formed separate from the hub ( 16 ), a friction disc ( 54 ) adapted to be gripped between the piston ( 36 ) and the locking wall ( 20 ), and circumferential damping means ( 56 ) which are provided with a damping input member ( 60 A, 60 B; 64 ) coupled to the friction disc ( 54 ), and with a damping output member ( 64 ; 60 ) which is coupled to the hub ( 16 ), wherein each of the male member ( 44 ) of the sealing means and the damping output member ( 64 ; 60 ) is attached on the hub ( 16 ) or carried by a member attached on the hub ( 16 ).