Gear spindle device for rolling mill, rolling equipment, and cooling method for gear spindle device for rolling mill

A gear spindle device for a rolling mill is provided with: a spindle outer cylinder having, on one end side, an inner peripheral surface on which inner peripheral teeth are provided; a spindle inner cylinder having an outer peripheral surface provided with outer peripheral teeth that mesh with the inner peripheral teeth; a seal member provided between the spindle outer cylinder and the spindle inner cylinder, the seal member holding lubricating oil at a meshing portion between the inner peripheral teeth and the outer peripheral teeth; and a coolant supply unit that is provided on the opposite side of the seal member with the engagement portion interposed therebetween in the axial direction of the spindle outer tube, and that supplies a coolant toward the range in which the engagement portion of the spindle outer tube is formed. 轧制机用的齿轮主轴装置具备：主轴外筒，其在一端侧具有设置有内周齿的内周面；主轴内筒，其具有设置有外周齿的外周面，该外周齿与所述内周齿啮合；密封构件，其设置在所述主轴外筒与所述主轴内筒之间，用于在所述内周齿与所述外周齿的啮合部保持润滑油；以及冷却剂供给单元，其设置于在所述主轴外筒的轴向上隔着所述啮合部而与所述密封构件相反的一侧，用于朝向所述主轴外筒的所述啮合部的形成范