What is the circuit of the excavator travel motor brake type?

Updated: Aug 26, 2018

A circuit that uses an overflow valve brake that provides dual-direction braking of the hydraulic motor and provides cushioning. When the reversing valve returns to the neutral position, it becomes a hydraulic pump under the action of inertia, and supplies the oil to the overflow valve through the one-way valve on the high pressure side. The relief valve limits the impact pressure and brakes the final drive motor. The hydraulic pump is also capable of self-priming from the fuel tank via a check valve on its low pressure side. With the circuit braked by the accumulator, an accumulator is installed close to its inlet and outlet oil holes, which can achieve two-way braking. When the reversing valve returns to the neutral position, the oil out of the original motor becomes high pressure because the motor becomes a pump. The accumulator on this side accommodates the oil discharged from the pump, and the accumulator on the other side provides the replenishment. oil. One of the normally closed-type brake brake circuits that control the brakes via a two-position hydraulic directional control valve. When the manual reversing valve is on the left or right side, the pressure oil is hydraulically changed to the valve to enter the brake hydraulic cylinder, and the brake is opened against the spring force to make the hydraulic travel motor work. When the manual reversing valve is placed in the neutral position, the hydraulic oil in the brake cylinder is discharged back to the fuel tank through the hydraulic valve and the manual reversing valve to brake the travel motor.

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