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05–17–28 AUTOMATIC TRANSAXLE Third gear . Gear rotation speed • Here we have the result on N R =N S . • Suppose gear ratio in third gear is i 3 , i 3 =N R /N C • From the result of N R =N S in formula (1), the relation between the gear ratio in third gear and the rotation speed of the front planetary gar set is indicated in the formula below. RF +Z SF ) N C = (Z RF +Z SF ) N R Therefore, 3 =N R /N C = (Z RF +Z SF ) / (Z RF +Z SF ) = (89+49) / (89+49) =1.000 As a result, the gear ratio in third gear is 1.000. Fourth gear . Gear rotation speed • Suppose gear ratio in fourth gear is i 4 , i 4 =N C /N R • From the result of N S =0 in formula (2), the relation between the gear ratio in fourth gear and the rotation speed of the rear planetary gear set is indicated in the formula below. RR +Z SR ) N C =Z RR N R Therefore, 4 =N C /N R =Z RR / (Z RR +Z SR ) =98/ (98+37) =0.7259 As a result, the gear ratio in fourth gear is 0.725. 1 Front planetary gear 2 Sun gear N S (input) 3 Internal gear N R (input) 4 Planetary carrier N C (output) 5 Pinion gear Planetary gear Front Internal gear N R (input) Planetary carrier N C (output) Sun gear N S (input) 5 4 3 1 2 B3E0517A010 1 Rear planetary gear 2 Sun gear (fix) 3 Internal gear N R (output) 4 Planetary carrier N C (input) 5 Pinion gear Planetary gear Rear Internal gear N R (output) Planetary carrier N C (input) Sun gear 0 (fix) 5 4 3 1 2 B3E0517A011 |