Contact layer on the surface of a metal element in relative movement against another metal element and an articulation joint provided with such a contact layer

Patent metadata

Field	Value
Publication number	US-11761478-B2
Application number	US-202016905540-A
Country	US
Kind code	B2
Filing date	Jun 18, 2020
Priority date	Jun 25, 2019
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A contact layer is formed by a deposition method on an inner surface of a first metal element by a centrifuging process, and preferably includes an inner layer of copper alloy and an outer layer of tin alloy. Such a contact layer is used in an articulation joint including a first metal element having a surface provided with the contact layer, and a second metal element with a second surface. The first and second elements are relatively movable such that first and second surfaces slide against each other.

First claim

We claim:

1. A method of forming a contact layer on a surface of a first metal element, the surface being intended to be slidable against a surface of a second metal element, the method comprising the steps of:
providing a copper alloy, a tin alloy and the first metal element formed of titanium or a titanium alloy and having an inner surface;
inserting the first metal element into a mold without removal of oxidation from the inner surface such that the surface is spaced from the interior of the mold;
introducing the copper alloy into the mold;
rotating the mold such that the copper alloy is impregnated on the surface of the first element by centrifugal force to form a first layer on the surface;
hardening the first layer on the first element;
introducing the tin alloy into the mold;
rotating the mold such that the tin alloy is impregnated on the first layer by centrifugal force to form a second, outer layer; and
hardening the second layer on the first layer.

2. The method of claim 1 , wherein the step of providing the copper alloy includes providing a copper alloy having a copper content of between fifty percent (50%) by weight and ninety percent (90%) by weight.

3. The method of claim 1 further comprising the step of extracting the first metal element from the mold prior to the step of introducing the tin alloy into the mold.

4. The method of claim 1 wherein the first layer has a thickness of between one hundred micrometers (100 μm) and three hundred micrometers (300 μm) and the second layer has a thickness between two micrometers (2 μm) and twenty micrometers (20 μm).

Assignees

• Skf Ab
• Skf Aerospace France Sas

Inventors

• Abdul Azeez
• Dayot Camille
• Matta Christine
• Yan Pei Rose
• Zhou Xiaobo

Classifications

• F16C11/0614 Primary

  the female part of the joint being open on two sides · CPC title

• F16C23/045 Primary

  for radial load mainly, e.g. radial spherical plain bearings · CPC title

• B22D13/04 Primary

  of shallow solid or hollow bodies, e.g. wheels or rings, in moulds rotating around their axis of symmetry · CPC title

• F16C11/0628 Primary

  with linings · CPC title

• F16C11/0661

  the two co-operative parts each having both convex and concave interfaces · CPC title