这种电动滚筒也称为间接油冷式电动滚筒。电动滚筒内有一定的冷却油液，由于滚筒体不停地旋转，筒体上刮油板将油液不停地浇到电动机和齿轮上，带走电动机和齿轮工作时产生的热量，把热量传递到滚筒体壁上，加速电机散热，并对齿轮产生润滑作用。油冷式电动滚筒的关键是电动机内部不允许进入油液。
This kind of electric roller is also called indirect oil cooling electric roller. There is a certain amount of cooling oil in the electric roller. As the roller body rotates ceaselessly, the oil scraper on the cylinder body will continuously pour the oil on the motor and gear, take away the heat generated by the motor and gear when they work, transfer the heat to the wall of the roller body, accelerate the heat dissipation of the motor, and have a lubricating effect on the gear. The key of oil-cooled electric roller is that no oil is allowed to enter the motor.