US 9,810,313 B2
Power transmission apparatus
Nobukazu Ike, Kariya (JP); Nobutada Sugiura, Nishio (JP); Takeshi Torii, Chiryu (JP); Hiroaki Sanji, Takahama (JP); and Masayuki Uchida, Anjo (JP)
Assigned to AISIN AW CO., LTD., Anjo (JP)
Appl. No. 14/765,204
Filed by AISIN AW CO., LTD., Anjo-shi, Aichi-ken (JP)
PCT Filed Mar. 20, 2014, PCT No. PCT/JP2014/057809
§ 371(c)(1), (2) Date Jul. 31, 2015,
PCT Pub. No. WO2014/156974, PCT Pub. Date Oct. 2, 2014.
Claims priority of application No. 2013-073679 (JP), filed on Mar. 29, 2013.
Prior Publication US 2015/0369356 A1, Dec. 24, 2015
Int. Cl. F16H 57/10 (2006.01); F16H 3/66 (2006.01); F16D 51/14 (2006.01)
CPC F16H 57/10 (2013.01) [F16D 51/14 (2013.01); F16H 3/663 (2013.01); F16H 2200/006 (2013.01); F16H 2200/2007 (2013.01); F16H 2200/2023 (2013.01); F16H 2200/2046 (2013.01); F16H 2200/2066 (2013.01); F16H 2200/2082 (2013.01); F16H 2200/2097 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A power transmission apparatus including a transmission, a case that accommodates the transmission, a counter drive gear to which power from the transmission is transmitted, a counter driven gear that meshes with the counter drive gear, and a drive pinion gear that is disposed and spaced apart in an axial direction from the counter driven gear and that rotates together with the counter driven gear, the power transmission apparatus comprising:
a brake including a brake drum fixed to the case, a brake hub disposed inside of the brake drum and coupled to any rotational element of the transmission, a first friction engagement plate fitted to the brake hub, a second friction engagement plate fitted to the brake drum, a piston that is disposed inside of the brake drum and that presses and engages the first and second friction engagement plates by friction, and an engagement oil chamber defined inside of the brake drum and the piston and to which hydraulic oil is supplied,
wherein the brake drum is fixed to the case so that a drum portion of the brake drum is disposed between the counter driven gear and the drive pinion gear in the axial direction,
wherein the drum portion has an inner radial surface in which the second friction engagement plate is fitted and an outer radial surface opposite the inner radial surface, and
wherein an axial end of the outer radial surface is adjacent to a tooth tip of the drive pinion gear and the axial end of the outer radial surface is disposed closer to an axis center of the counter driven gear and the drive pinion gear than an outer radial surface of the tooth tip.