油浸式电动滚筒也叫直接油冷式电动滚筒，这类型的电动滚筒允许油液进入电动机内部，直接与电动机转子和定子绕组接触，将它们工作时产生的热量靠滚筒体不断地旋转而传递到滚筒体内壁。这种结构的散热效果较好，但对润滑油和电动机的质量相对要求也较高。
Oil immersed electric roller is also called direct oil-cooled electric roller. This type of electric roller allows oil to enter into the motor, directly contact with the motor rotor and stator winding, and transmit the heat generated when they work to the inner wall of the roller by the continuous rotation of the roller body. This kind of structure has good heat dissipation effect, but the quality of lubricating oil and motor is relatively high.