Patent ID: 11885410
Assignee: ROLLS-ROYCE DEUTSCHLAND LTD & CO KG
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A planetary gear box, which has:
a sun gear, which is rotatable about a rotation axis of the planetary gear box and defines an axial direction of the planetary gear box,
a plurality of planet gears, which are driven by the sun gear,
a ring gear with which the plurality of planet gears are in engagement, and
a plurality of plain bearing pins with each having a longitudinal axis and an external contact face having two axial ends,
each of the plain bearing pins being arranged in a corresponding one of the planet gears to form a lubricated plain bearing,
each of the plain bearing pins including a crowning at the contact face, wherein an outer diameter of the contact face decreases from a maximum outer diameter towards at least one of the axial ends,
wherein the crowning of the contact face is configured such that the contact face is concavely shaped adjacent to the at least one of the axial ends or to a cylindrical region adjoining the at least one of the axial ends,
wherein the contact face of each of the plain bearing pins, in longitudinal section, forms a first concave curve adjacent to the at least one of the axial ends or to a cylindrical region adjoining the at least one of the axial ends, the first concave curve transitioning into a convex curve, in a region of the maximum outer diameter, and the convex curve transitions into a second concave curve, which extends as far as the other of the axial ends.