When the load is small, the rotation speed of the turbine is fast; when the load is large, the rotation speed is slow. When the crawler bulldozer cannot move due to overload, the speed of the turbine also drops to 0, which becomes the braking state of the turbine. At this time, because the turbine stops rotating, the oil sprayed from the pump wheel cascade passes through the turbine cascade to the guide wheel with the greatest impact, and is converted into pressure in the non-rotating guide wheel cascade. Turbine, the torque of the turbine is increased. The increased torque is consistent with the direction of rotation of the turbine. At this time, the output torque of the turbine is the largest, which is 2.54 times the torque of the pump wheel.
As the load increases, the speed of the turbine gradually decreases, and the torque gradually increases, which is equivalent to a continuously variable transmission gradually decreasing speed and increasing torque. This stepless torque conversion performance is matched with the planetary gear type power shift transmission which is easy to manipulate and has fewer gears, so that the crawler bulldozer obtains excellent traction performance.
