It is a wheel a grooved rim and can rotate freely.
它是一个带有凹边的齿轮而且能自由地转动。
Rolling of Drawing Roll Grooved Serrated Form Design and Manufacture of Rolling Wheel
罗拉沟槽齿形的滚轧加工和轧轮的设计制造
a stroking mechanism is arranged on the pump shell and can control the relative sliding between the vane wheel and the grooved wheel.
泵壳上设有变量机构可控制叶轮与槽轮之间的相对滑动。
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