PLANETARY GEAR TRAIN OF AUTOMATIC TRANSMISSION FOR VEHICLES

A planetary gear train of a transmission for a vehicle is provided. The planetary gear train includes an input shaft that receives power of an engine and an output shaft that outputs power. Additionally, four planetary gear sets are provided each having three rotation elements. Various shafts then connect the rotation elements either directly or selectively. Accordingly, a gear shift stage appropriate to a rotation speed of an engine is implemented and operating noise of a vehicle is reduced by using a driving point in a low rotation speed range of the engine. 本发明提供车辆自动变速器的行星齿轮系。行星齿轮系包括，输入轴，接收发动机动力，以及输出轴，输出动力。此外，提供四个行星齿轮组，每个具有三个旋转元件。随后，多个轴直接或选择地连接每个旋转元件。因此，实施了适于发动机转速的变速挡位，并且通过使用发动机低转速范围中的运行点降低了车辆的操作噪声。