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牵引电动机炭刷的试验选型工作,是内燃机车电机质量改进和简统化的内容之一。据各段反映,目前内燃机车牵引电动机炭刷质量较差,主要表现在:70年以来批量较大的DS74B炭刷磨耗很快,磨损率在10毫米/万公里以上,机车经常只运行两个中检就要换炭刷,特别严重的有不满一个中检就已磨到铆钉,并引起换向器刮伤事故。而且DS74B炭刷的大量磨耗,造成了备品不足,甚至影响机车运行。DS 52炭刷虽本身很耐磨,
Traction motor carbon brush test selection work, is the improvement of internal combustion motor quality and simplification of the content of the motor. According to the paragraphs reflect the current diesel locomotive traction motor brush poor quality, mainly in: large quantities of 70 years since the large amount of carbon brush DS74B wear quickly, the wear rate of 10 mm / km km above, the locomotive often only run two In the inspection will have to change the carbon brush, particularly serious dissatisfaction with a mid-inspection has been worn rivets, and cause commutator scratch accident. And a large number of DS74B carbon brush wear, resulting in lack of spare parts, and even affect the locomotive operation. DS 52 carbon brush itself is very wear-resistant,