Abstract: By using the same liquid for cooling and lubricating a feed shaft, a simpler structure is obtained, thereby allowing easier maintenance. A feed shaft that is rotatably supported at one end thereof moves a slide of a machine tool. The feed shaft is supported by a support member via a bearing. A pipe is fitted to the feed shaft, and a pathway space is provided allowing the reciprocal flow of the cooling/lubricating liquid in the axial direction. Some of the cooling/lubricating liquid supplied via the support member to the feed space passes through the pathway space as cooling liquid, cools the feed shaft, and is held in a discharge space. At the same time, some of the cooling/lubricating liquid flows, as lubricating liquid, into the bearing, is discharged, and is held in a discharge space. The cooling/lubricating liquid in the discharge space that has absorbed the heat of the structure is immediately discharged out of the support member.

Abstract: By using the same liquid for cooling and lubricating a feed shaft, a simpler structure is obtained, thereby allowing easier maintenance. A feed shaft that is rotatably supported at one end thereof moves a slide of a machine tool. The feed shaft is supported by a support member via a bearing. A pipe is fitted to the feed shaft, and a pathway space is provided allowing the reciprocal flow of the cooling/lubricating liquid in the axial direction. Some of the cooling/lubricating liquid supplied via the support member to the feed space passes through the pathway space as cooling liquid, cools the feed shaft, and is held in a discharge space. At the same time, some of the cooling/lubricating liquid flows, as lubricating liquid, into the bearing, is discharged, and is held in a discharge space. The cooling/lubricating liquid in the discharge space that has absorbed the heat of the structure is immediately discharged out of the support member.