| 摘要 |
The invention relates to a hydrokinetic coupling device for a motor vehicle. The inventive device consists of a lockup clutch comprising at least one friction collar (34, 36) which is disposed axially between a friction bearing surface of the casing and the friction bearing surface of the piston. Moreover, at least one lateral friction face (60) of the aforementioned friction collar is equipped with a network (62) of cooling grooves (64), which comprises at least two cooling grooves (64) and which is arranged such that the sum of the values of the cooling surfaces that are disposed radially between the mean radius (Rm) and an outer edge (70) of the friction face (70) is greater than the sum of the values of the cooling surfaces that are disposed radially between an inner edge (68) and the mean radius (Rm) of the friction face (60).
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