Rolling mill drive with gear-type joint spindles and with a device for circulatory lubrication

A rolling mill drive comprising spindles with gear-type joints, the spindles being arranged between driveable rolls and gear units of the driveable rolls and each being equipped with a device for circulatory lubrication of the gear units, each spindle comprising a grooved oil supply ring adapted for connection to an oil supply, each spindle having a spindle shaft forming a central duct, wherein oil is conductible through the central duct of the spindle shaft to the gear-type joints, further comprising a stationary housing surrounding the spindle shaft at a distance and serving for oil discharge, and an oil delivery pump connected on a pressure side to the oil supply rings and interacting with an oil cooler, a pipe surrounding each spindle at a radial distance therefrom so as to form an annular oil return duct, the pipe being open at an end thereof facing the gear unit, the pipe protruding for oil discharge into an oil collection housing, and an internally toothed spindle sleeve arranged at a side of the roll stand, wherein the oil return duct is in communication with the central duct through the spindle sleeve, further comprising a spherical joint mounted on the pipe for guiding in an articulated manner and for sealing the pipe on the side of the roll stand toward the outside relative to the spindle sleeve, wherein the central duct extends through the gear-type joint on the side of the gear unit and extends into the internally toothed spindle sleeve and has a throttle at an end of the gear unit, and wherein the central duct extends on the side of the roll stand through the gear-type joint on the roll stand side and has a throttle at an end at the roll stand side.