Planetary gear systems are also used in many automatic transmissions. 行星齒輪組也同樣用于許多汽車(chē)變速器中。
The bike chain drives a sun gear on the rear axle, which transmits power to planetary gears situated around it. 自行車(chē)的鏈條會(huì )驅動(dòng)后輪輪軸上的太陽(yáng)齒輪,將動(dòng)力傳送到四周的行星齒輪。