Abstract Aisin AW (AW) and Toyota Motor Corporation (TMC) have developed a new RWD 6 speed automatic transmission, AWR6B45(AC60), suitable for SUV’s and LDT’s in the worldwide market, not only for North America but also for other countries including emerging nations. This 6 speed automatic transmission has achieved low cost, equivalent to AW and TMCs’ current 5 speed automatic transmission, while realizing improvement in both fuel economy and driving performance against current in-house 5-speed automatic transmissions, in addition to satisfying both toughness against various usage and light weight/compactness. They are accomplished by using a compact gear train structure, the latest efficiency improvement technologies, and a high-response, compact hydraulic control system. In addition, the compactness of this 6 speed automatic transmission enables it to replace current 4 speed and 5 speed automatic transmissions for various engine applications. This makes it possible to contribute toward Toyota's TNGA (Toyota New Global Architecture) by reducing the number of parts significantly. Introduction Due to recent global energy and environmental issues, it has become essential to develop automobiles with a greater degree of fuel economy and cleaner exhaust gasses. The demand for a commercial vehicle, which is equipped with an FR (Front mount Rear drive) automatic transmission, is expected to increase in North America but also in other countries including emerging nations such as South East Asia. Under these circumstances it is becoming increasingly important to realize the improved fuel economy performance, which is applied to each countries’ regulations, cost reduction, which is focused on the emerging market, and enhanced durable quality against various usage. Future automatic transmission concepts for commercial vehicles must fulfill the above requirements.Development Objects 1. Improved fuel economy while providing low cost suitable for emerging market needs. 2. Durable quality capable of adapting to various environments 3. Covering a wide range of vehicles and engines with superior mountability and torque capacity. 4. Capable for local procurement and production worldwide Structure The following is the basic structure and specifications of this automatic transmission. Figures 1 and 2 show the cross section view and gear train schematic of AWR6B45, respectively. Table 1 shows the operation of AWR6B45 friction elements. From the front (engine side) of the transmission, there are a torque converter, oil pump and two multiple-structure clutches (C-1, C-2). Behind these units, there is a 6 speed gear train with three planetary gear sets (front, center and rear). Around the planetary gear sets, there is a single one-way clutch (F-3) and three brakes (B-1,B-2 and B-4). A hydraulic control system is located below the planetary gear sets. Figure 1. Cross Section of AWR6B45The New RWD 6 Speed Automatic Transmission for SUV and Truck2016-01-1097 Published 04/05/2016 Satoshi Fukuyama, Tomohide Suzuki, and Akira Murata Aisin AW Co., Ltd. Hiroshi Mizoguchi and Toshihiko Kamiya Toyota Motor Corporation CITATION: Fukuyama, S., Suzuki, T., Murata, A., Mizoguchi, H. et al., "The New RWD 6 Speed Automatic Transmission for SUV and Truck," SAE Technical Paper 2016-01-1097, 2016, doi:10.4271/2016-01-1097. Copyright © 2016 SAE InternationalDownloaded from SAE International by University of British Columbia, Sunday, August 19, 2018Figure 2. Gear Train of AWR6B45 Table 1. Operation Chart of Friction Elements Gear Train AWR6B45 is structured with three planetary gear sets (All single planetary gear), two clutches, three brakes and a single one-way clutch. AWR6B45 has achieved 6 speeds while reducing the number of shift elements against current 5 speed automatic transmission by adopting direct control linear solenoids. ( Fig.3) In order to improve gear noise characteristics, AW and TMC adopted a concept of Zero-total pow