1. Travel motor design: Travel motors usually use high-speed motors plus planetary reducers or cycloidal gear reducers to improve efficiency and torque. The motor is equipped with a high-pressure automatic variable device to automatically adjust the displacement and speed according to the driving speed and resistance.
2. Travel process: When the excavator needs to travel, high-pressure oil enters the oil inlet of the travel motor to drive the motor to rotate. If the driving resistance increases and the oil pressure rises to the set value, the motor automatically changes to a large-displacement low-speed gear to increase the torque. The rotation of the motor drives the crawler travel device to realize the forward or backward movement of the excavator.
3. Brake release mechanism: During the walking process, if the travel operating lever is placed in the middle stop position, the control valve travel valve core is reset to cut off the motor's return oil circuit. At this time, since the motor will continue to rotate under the action of inertia, the hydraulic oil at the return oil port is compressed, causing the pressure to rise. When the pressure exceeds the set pressure of the overload protection valve, the valve opens, and the high-pressure oil circuit and the return oil circuit are connected to achieve a smooth hydraulic road. At the same time, the high-pressure oil in the brake release channel pushes the brake pad to move, separating the friction plate and the separation plate, releasing the brake。