Planetary gear box
AssigneeRolls-Royce Deutschland Ltd & Co KG
InventorsPaul Gorenz, Maximilian Prölss
Life of this patent
Estimating the term…
Abstract
The invention concerns a planetary gear box, which has a sun gear, a plurality of planet gears, a ring gear and a plurality of plain bearing pins. Here, a plain bearing pin is arranged in each planet gear, wherein the plain bearing pin and the planet gear form a lubricated plain bearing, and the plain bearing pin forms a crowning at its contact face, wherein the outer diameter of the contact face decreases from a maximum outer diameter towards at least one axial end of the contact face. The crowning of the contact face is configured such that the contact face is concavely shaped adjacent to at least one axial end of the contact face or to a cylindrical region adjoining the axial end.
Claims18
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.
A method for providing a bearing pin assembly for a planetary gear box, comprising:
- providing 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 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;
- and
- mounting a planet gear on each of the plain bearing pins.
Dependencies are inferred from the claim text.