我国批量生产的中、小型回转支承规格有两种：一种是徐州回转支承厂引进技术生产的ＪＢ系列，外齿轮变位系数为正值ｘ＝０．５；另一种是马鞍山回转支承厂生产的ＪＪ系列，外齿轮变位系数ｘ＝０．５。二者的变位系数相反，究竟哪一种较合适？ 开式外啮合齿轮的破坏形式主要是齿 China’s mass production of small slewing bearings in the specifications there are two: one is Xuzhou slewing bearing plant introduction of technology to produce JB series, the external gear displacement coefficient is positive x = 0.5; the other is the Ma On Shan Rotary Support Plant Production of JJ series, external gear displacement coefficient x = 0.5. The opposite of the two coefficient of variation, which one is more appropriate? Open external gear damage is mainly the form of teeth