US 11,739,800 B2
Automatic transmission
Hisashi Toyama, Fujinomiya (JP); and Yuya Kimura, Fuji (JP)
Assigned to JATCO LTD, Fuji (JP); and NISSAN MOTOR CO., LTD., Yokohama (JP)
Appl. No. 17/638,733
Filed by JATCO Ltd, Fuji (JP); and NISSAN MOTOR CO., LTD., Yokohama (JP)
PCT Filed Nov. 17, 2020, PCT No. PCT/JP2020/042823
§ 371(c)(1), (2) Date Feb. 25, 2022,
PCT Pub. No. WO2021/106685, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 2019-214323 (JP), filed on Nov. 27, 2019.
Prior Publication US 2022/0282759 A1, Sep. 8, 2022
Int. Cl. F16D 25/0638 (2006.01); F16H 63/30 (2006.01)
CPC F16D 25/0638 (2013.01) [F16H 63/3026 (2013.01); F16H 2200/2035 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An automatic transmission, in which a first multi-plate brake device and a second multi-plate brake device are arranged side by side in a direction of a rotating axis along an inner peripheral surface of a transmission case, wherein:
the first multi-plate brake device and the second multi-plate brake device respectively comprise:
a plurality of frictional engagement plates;
a piston, which is provided on one end side of the plurality of the frictional engagement plates in the direction of the rotating axis and executes strokes in the direction of the rotating axis; and
a snap ring, which is provided on the other end side of the plurality of the frictional engagement plates in the direction of the rotating axis and regulates the movement of the plurality of the frictional engagement plates in the direction of the rotating axis, wherein,
in the first multi-plate brake device, the piston is retained by a piston retainer which is arranged on the second multi-plate brake device side of the piston and fixed to the inner peripheral surface of the transmission case,
in the second multi-plate brake device, the snap ring is supported by a supporting portion which is formed on the first multi-plate brake device side of the snap ring and protrudes from the inner peripheral surface of the transmission case radially inward to the rotating axis, and
the piston retainer of the first multi-plate brake device includes an abutting portion that protrudes to the second multi-plate brake device side and abuts the supporting portion from the opposite side of the snap ring of the second multi-plate brake device; and
the abutting portion includes a thick portion whose radial thickness on a lower side in a vertical direction is increased as compared to on an upper side in the vertical direction based on a state of mounting the automatic transmission on a vehicle.