TAILIEUCHUNG - Automatic Transmissions P15

U-Series transaxles | Section 2 U-Series Transaxles Lesson Objectives 1. Explain the unique difference between the U-series planetary gear set and the Simpson planetary gear set. 2. Describe the primary difference in power flow between the U-240 and U-341 transaxles. 3. Given the Clutch Brake Designation Chart differentiate the names for clutches based on the transmission model. 4. Given the Clutch Application Chart and the power flow model identify the planetary gear components held for each gear range. Automatic Transmission Diagnosis - Course 273 Section 2 1 -- M Jti s TOYOTA Technical Training U-Series Transaxles Transaxle Overview The U-Series automatic transaxles are compact lightweight electronically controlled four speed transmissions introduced in model year 2000 Echos and Celicas. The counter drive gear assembly is located in front of the planetary gear sets rather than behind them as in the earlier transaxle models which contributes to the compact lightweight design. The transmission s planetary gear design is a unique departure from the familiar Simpson planetary gear design used in all previous Toyota transmissions. The Simpson planetary gear design uses two planetary gear sets with a common single sun gear for first second third and reverse gears. The U-series departs from this design with two planetary gear sets with separate sun gears. U-341E The U-341E gets four forward gears and one reverse gear from this compact design. Additionally ring gears and planetary carriers of the two planetaries are connected. U-341E Planetary Gear Unit The U-Series transaxles has two planetary gear sets and separate sun gears. Additionally ring gears and planetary carriers of the two planetaries are connected. The front planetary ring gear is connected to the rear planetary carrier. They are held to the case in the counterclockwise direction by the No. 2 one-way clutch F2 and held in both directions by the 1st and reverse brake B3 . The rear planetary carrier can be driven by the .

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