EMU Dearbox Grounding Device

The gearbox grounding device of the EMU (Electric Multiple Unit) adopts a ring-grinding type design.
The grounding device mainly consists of components such as a protective cover, carbon brush, collector ring, constant-force spring, brush holder, and insulation structures.
The collector ring is press-fitted onto the axle and is a steel ring that maintains close contact and friction with the carbon brush. Together, they form a conductive circuit to enable current return.
The main body of the grounding device is installed on the gearbox collector ring housing.
It includes a carbon brush and a constant-force spring, which ensures reliable contact between the carbon brush and the collector ring.
The grounding device is equipped with an insulating sleeve and insulating base to electrically isolate the main body from the collector ring housing.
Sealing elements are integrated into the design to prevent external water or dust from entering the device.
An observation window is provided on the grounding device, and the carbon brush is marked with a wear limit warning.
This allows for real-time monitoring of carbon brush wear without disassembling the gearbox grounding device.