| 摘要 |
PURPOSE: A gear train for automatic transmission makes 5 advance speeds and a reverse speed by using 3 planet gears and 4 friction elements, improves the efficiency of power and realizes a small and a light body. CONSTITUTION: A gear train comprises a 1st, a 2nd and a 3rd planet gears(PG1,PG2,PG3), a 1st, a 2nd and a 3rd clutches(C1,C2,C3) and a 1st break(B1). The 1st planet gear(PG1) has an element variably connected to an input shaft(1), an element transferring power to a transfer shaft(5) and an element variably connected to the input shaft(1) and one of the former elements. The 2nd planet gear(PG2) has an element fixedly connected to a member of the 1st planet gear(PG1), an element variably connected to a transmission housing(3), and an element transferring power to the transfer shaft(5) after being connected to the other member of the 1st planet gear(PG1). The 3rd planet gear(PG3) has an element fixedly connected to the 2nd planet gear(PG2), an element variably connected to the input shaft(1), and an element transferring power to the transfer shaft(5). In order for the 1st, the 2nd and the 3rd planet gears(PG1,PG2,PG3) to transform the inputs transferred to the input shaft(1) into 5 advance speeds and a reverse speed and transfer them to the transfer shaft(5), the 1st, the 2nd and the 3rd clutches(C1,C2,C3) variably connect a certain member of the 1st, the 2nd and the 3rd planet gears(PG1,PG2,PG3) to the input shaft(1) or variably connect certain members of the 1st and the 3rd planet gears(PG1,PG3) between themselves, and the 1st break(B1) variably connects a certain member of the 2nd planet gear(PG2) to the transmission housing(3).
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