Excavator final drive motors working principle
Updated: Aug 4, 2018
The weight of medium and large crawler excavators is generally above 20t. The inertia of the machine is very large, which will bring a big impact to the hydraulic system during the start and stop of the machine. Therefore, the final drives control system must be improved to adapt to this. Kind of working conditions.
The travel motors generally adopts a high-speed motor plus a planetary reducer or a cycloidal pin reducer, and the control of the circuit of the hydraulic motor part has its own characteristics. The control circuit of the travel motor is shown in Figure 1. The motor is equipped with a high-voltage automatic variable device. When the high-speed gear is engaged, the circuit is connected to the manual shift port to oil, pushing the shift valve to the left to make the motor become a small displacement; When the resistance increases and the oil pressure rises to the set value, the oil pushes the shift valve to the right, and the mothttps://www.spfinaldrives.com/or automatically changes to a large displacement low speed gear to increase the torque. Therefore, the final drive motors can automatically change the gear as the walking resistance changes.
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