Patent ID: 8701850

Claim:
A friction device assembly structure for an automatic transmission, comprising: a rotary body being coaxially provided with an input shaft; a first friction device including a plurality of discs and a plurality of plates alternately arranged wherein a pressing force of a piston creates a frictional force between the discs and the plates; a second friction device having an outer diameter which is smaller than an outer diameter of the first friction device; and an end play adjustment element provided on an end of the first friction device to adjust an end play defined between the first friction device and the piston, the end play adjustment element being hollow such that an inner diameter thereof is greater than a diameter of an outermost portion of the second friction device, whereby the end play adjustment element is assembled without interference with the second friction device; wherein inner portions of both the first friction device and the second friction device are engaged to the rotary body, respectively.