Motor car gear box grounding device

Abstract

The invention discloses a motor car gear box grounding device, which comprises a grounding box, two carbon brushes, insulation elements and wire distributor structure elements and also comprises a first carbon brush support frame, a second carbon brush support frame, two scroll spring assemblies and two observation window assemblies, wherein the first carbon brush support frame and the second carbon brush support frame are fixedly arranged at the bottom of the grounding box through screw bolts and the insulation elements; in addition, the first carbon brush support frame, the second carbon brush support frame and the grounding box simultaneously form an installing cavity in a surrounding way; the two carbon brushes are respectively inserted in guide holes of the first carbon brush and the second carbon brush in a glidingly matched way; one end of each of the two carbon brushes is positioned in the installing cavity and is connected with the first carbon brush support frame and the second carbon brush support frame through conducting wires, and the other end of each of the two carbon brush is exposed out of the installing cavity; the two scroll spring assemblies are arranged on the grounding box and are respectively abutted against one end of the corresponding carbon brush in an insulated way; the two observation window assemblies are arranged on the grounding box and respectively correspond to the positions of the corresponding scroll spring assemblies; wire distributor structure elements are respectively and fixedly arranged on the first carbon brush support frame and the second carbon brush support frame. The motor car gear box grounding device has the advantages that the fixed pressure of the carbon brushes can be maintained, the abrasion is monitored, and the insulation performance is good.

Description

technical field [0001] The invention relates to a current grounding device, in particular to a grounding device for a gear drive system of an EMU. Background technique [0002] The grounding device is widely used in EMUs, subways, and rolling stock. It is mainly composed of grounding boxes, carbon brushes and brush holders, springs, insulating parts, etc.; its main function is to collect the leakage current on the train in time and conduct it to the ground. [0003] The contact resistance of the grounding device affects its conductivity. The stability of the contact resistance is determined by the stability of the carbon brush pressure, and the pressure of the carbon brush is related to the pressure, performance and installation method of the spring. At present, the spring pressure setting of many grounding devices is unreasonable. , the performance is not stable enough, the improper installation method and other factors lead to its frequent failure; in addition, the carbon ...

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Problems solved by technology

[0003] The contact resistance of the grounding device affects its conductivity. The stability of the contact resistance is determined by the stability of the carbon brush pressure, and the pressure of the carbon brush is related to the pressure, performance and installation method of the spring. At present, the spring pressure setting of many grounding devices is unreasonable. , the performance is not stable enough, the improper installation method and other factors lead to its frequent failure; in addition, the carbon brush is a wear part, and its wear condition varies greatly. It is very important to observe its wear condition in time, but many grounding devices do not have direct observation windows, and some even need to be disassembled to observe; vehicles such as locomotives and subways often use axle boxes for grounding, while EMUs often use gear boxes for grounding, which has limited installation space and large currents, so a new approach is proposed for the compactness of the grounding device Require

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