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波兰耶尔奇(JELZC)载重汽车变速籍的同步环形状比较奇特(图1),其外廓由渐开线齿、矩形键和槽以及一部分圆柱面所组成,成120度对称。我厂在制造JELZC
The shape of the synchronizing ring of the JELZC truck gearshift is peculiar (Figure 1). Its profile consists of involute teeth, rectangular keys and grooves, and part of the cylindrical surface, forming a 120 degree symmetry. I plant in the manufacture JELZC