Hydraulic coupling for feeding fluid-driven actuators-particularly hydraulic motors, mounted on a rotating structure

A hydraulic coupling for distributing pressurized oil from a pressurized oil source to a plurality of hydraulic motors actuators mounted on a rotating structure, wherein the rotating structure is constituted by a drum feeder rotatable about a rotation axis thereof for feeding bars to an automatic multispindle lathe and said actuators are constituted by hydraulic motors which are angularly distributed around said rotation axis, the coupling comprising:

• a plurality of ducts branching out axially from said feeder and being angularly distributed with respect to said rotation axis, said ducts being connected to delivery and return connections of said motors at a first end thereof;
• a stationary distributor for connecting said motors to the pressurized oil source and to an oil discharge;
• flexible hoses for connecting a second end of said ducts opposite to said first end, to said distributor, said flexible hoses being arranged in a spiral around said rotation axis and having a length which allows the rotation of said feeder with respect to said distributor through a preset angle, said distributor being of the valve type for controlling oil flow through said flexible hoses and for connecting the delivery and return connections of oil to and from said motors according to a programmed sequence.