Planetary gear box and method for operating a planetary gear box and gas turbine engine having at least two central shafts and having a planetary gear box

A gas turbine engine having at least two central shafts and having a planetary gear box with at least one planet gear which, by means of a bearing unit, is arranged rotatably on a planet pin of a rotatable planet carrier,

• wherein oil can be introduced via an open oil feed and via a closed oil feed into the bearing unit,
• wherein the oil feeds are connected fluidically to the bearing unit and rotationally conjointly to the planet carrier,
• wherein, as the planet carrier rotates, the oil downstream of an opening of the open oil feed for the oil is conducted in the open oil feed in the direction of the bearing unit by the centrifugal force acting on the oil,
• wherein the open oil feed is, between the opening and the bearing unit, configured with at least one oil filter through which the oil is conducted between the opening and the bearing unit,
• wherein the first central shaft is configured to be operated at a higher rotational speed than the second central shaft during operation, and the second central shaft is coupled to the planetary gear box,
• wherein the closed oil feed is connected to a pressure side of an oil pump, the drive shaft of which is connected to the first central shaft,
• and wherein an oil feed unit is provided, from which oil is introduced into the open oil feed.