| 摘要 |
An insulating member for a carbon brush holder includes a main body and a cover member. The main body includes a through hole, which has an internal thread formed around its periphery. The internal thread is provided with a spiral internal thread tooth serially formed thereon. The internal thread tooth has a first internal tooth bevel and a second internal tooth bevel. The first internal tooth bevel has a larger distance between a peak and a bottom of the internal thread tooth than that of the second internal tooth bevel. The second internal tooth bevel has a first convexity abutting the first internal tooth bevel. The cover member has an external thread formed around a periphery thereof for threadedly fitted into the internal thread of the main body. Accordingly, the cover member can be tightly threadedly fitted with the main body.
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