Two groove of the inner ring and outer ring groove for the ball between the form of a drum, equipped with roller bearings.
二条滚道的内圈和滚道为球面的外圈之间，装配有鼓形滚子的轴承。
1 roller method: there are two kinds of roller and single drum.
滚筒法：有双滚筒和单滚筒两面种。
1 roller method: there are two kinds of roller and single drum.
滚筒法：有双滚筒和单滚筒两面种。
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