Planetary gear power-distributing-type steering mechanism

The invention discloses a planetary gear power-distributing-type steering mechanism which comprises a box. A middle power transmitting part, a steering control part, a steering planetary transmission part, a left external driving gear and a right external driving gear are installed on the box. The box is connected with a gearbox, a power output shaft of the gearbox is connected with the steering planetary transmission part, the steering planetary transmission part is respectively connected with the left external driving gear and the right external driving gear, and the steering control part is connected with the steering planetary transmission part through the middle power transmitting part to achieve steering control. According to the planetary gear power-distributing-type steering mechanism, steering power is input from gear rings of a planetary gear transmission mechanism in a distributed mode to a traveling transmission mechanism through steering bevel gears to achieve steering, power failures do not exist during steering, and the transmission efficiency is high; indirect control is adopted for steering control, and on the premise that the steering control characteristic is guaranteed, the structure of the steering planetary transmission part is effectively simplified; the planetary gear power-distributing-type steering mechanism is easy and convenient to operate, driving is easily carried out, and convenience is brought to achieving high-accuracy steering wheel steering of a caterpillar tractor.