SPINDLE UNIT Russian patent published in 2001 - IPC

FIELD: machine tool manufacture, possibly high-revolution number spindle units of metal cutting machine tools. SUBSTANCE: spindle unit includes body in which spindle is rotatably mounted in bearing assemblies. Spindle has inclined and parallel relative to its axis ducts arranged uniformly along circle and communicated with cylindrical cavity of bushing secured to back end of spindle. Lengthwise helical grooves are provided in ducts of spindle in order to increase revolution number of spindle due to elimination of dead zone of cooling process at circulation of heat transfer agent. There are cross helical grooves on surface of cylindrical cavity of said bushing. Helical grooves of inclined ducts and ducts parallel relative to spindle axis are combined. EFFECT: enhanced efficiency of machine tool with such spindle. 4 dwg