Separable threaded connection with asymmetric coating
US11105457B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2015 |
| Grant date | Aug 31, 2021 |
| Priority date | — |
| Expiry date | Aug 26, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L58/06
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A screw joint has a tubular element with a female thread and a tubular element with a male thread, wherein the male thread and the female thread have first contact surfaces that cooperate with each other, and the tubular elements optionally have second contact surfaces adjacent to the female thread and/or the male thread, wherein the first contact surfaces and the optional second contact surfaces each have a coating including a first and a second layer, wherein the first layer is formed as a conversion layer in each case, one of the first contact surfaces that cooperate with each other has a second layer made of ceramic material with a friction reducing effect and the other of the two contact surfaces that cooperate with each other has, as a second layer, a varnish layer with a binding agent made of an organic polymer throughout which solid lubricant particles are distributed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.