Patent ID: 8715125

Claim:
A friction-plate lubricating device for an automatic transmission, the device comprising: a friction engagement element including a plurality of friction plates in which outer friction plates and inner friction plates are alternately disposed; a hub having splines engaged with teeth formed on an inner circumference of the inner friction plates, the hub having the splines on an outer circumference of the hub and has uneven portions formed on an inner circumference of the hub; and a nozzle that discharges lubricant to the uneven portions is provided; wherein: recesses of the uneven portions serve as oil reservoirs in which the lubricant gathers, and through-holes are formed in bottom surfaces of the recesses; and the lubricant discharged from the nozzle is collected in the oil reservoirs formed of the recesses so as to be supplied to the plurality of friction plates of the friction engagement element through the through-holes.