Friction bearing and method for lubricating and cooling a friction bearing

A friction bearing of a planetary gearbox, comprising:

• a rotationally fixed first component and a second component rotatably connected thereto,
• an oil feed pocket positioned on the first component and configured to direct oil into a bearing clearance between the first and second components,
• a first port connected to a first line opening into the oil feed pocket, and configured for directing the oil into the oil feed pocket,
• an oil supply unit by which the oil is fed to the bearing clearance at a defined pressure, wherein the oil supply unit and a flow cross section of the first line is specified so that a ratio between a first factor being a product of a square of a velocity of the oil from the first line being directed into the bearing clearance and a density of the oil, and a second factor being a product of a square of a velocity of the oil adhering to the second component and the density of the oil, wherein the ratio is at least 5×10−3.