Mechanical seal arrangement having sliding surfaces of different hardness
US-2016053895-A1 · Feb 25, 2016 · US
Rotary seals
US9810298B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9810298-B2 |
| Application number | US-201615148145-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 6, 2016 |
| Priority date | May 14, 2015 |
| Publication date | Nov 7, 2017 |
| Grant date | Nov 7, 2017 |
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- Title
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Abstract
Official abstract text for this publication.
A rotary seal comprising: a shaft with a chromium oxide coating provided at a seal contact area; wherein said coating has a hardness of at least 55 Rockwell-C. The coating may have a surface roughness parameter (Ra) of between 0.2 and 0.4 circular. The coating may have a thickness of at least 0.1 mm. The coating layer forms part of a rotary seal with a flexible seal element that is biased into contact with the surface of the coating. The flexible seal element may be biased against the shaft by a spring to increase the pressure of the flexible seal element against the coating. The coating is preferably deposited by a plasma spray process.
First claim
Opening claim text (preview).
The invention claimed is: 1. A rotary seal comprising: a shaft with a chromium oxide coating provided at a seal contact area; wherein said coating has a hardness of at least 55 Rockwell-C; wherein the coating has a surface roughness parameter R a at least 0.2; wherein the coating has a thickness of at least 0.1 mm; and wherein the coating has a surface that has been ground using a non-linear grinding technique. 2. A rotary seal as claimed in claim 1 , wherein the coating has a surface roughness parameter R a of no more than 0.4. 3. A rotary seal as claimed in claim 1 , wherein the coating has a surface that has been ground using a circular grinding technique. 4. A rotary seal as claimed in claim 1 , comprising a flexible seal element that is biased into contact with the surface of the coating. 5. A rotary seal as claimed in claim 4 , wherein the seal comprises a spring arranged to increase the pressure of the flexible seal element against the coating. 6. A rotary seal as claimed in claim 1 , wherein the coating has been deposited by plasma spray. 7. An actuator assembly comprising: a gear box; an input shaft; and at least one rotary seal as claimed in claim 1 which seals the gear box around the input shaft. 8. An actuator assembly as claimed in claim 7 , wherein the gear box comprises a ball screw.
Assignees
Inventors
Classifications
- C23C4/18Primary
After-treatment · CPC title
with balls · CPC title
Plasma spraying · CPC title
for plastic packings · CPC title
Materials or coatings for screws or nuts · CPC title
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- What does patent US9810298B2 cover?
- A rotary seal comprising: a shaft with a chromium oxide coating provided at a seal contact area; wherein said coating has a hardness of at least 55 Rockwell-C. The coating may have a surface roughness parameter (Ra) of between 0.2 and 0.4 circular. The coating may have a thickness of at least 0.1 mm. The coating layer forms part of a rotary seal with a flexible seal element that is biased into …
- Who is the assignee on this patent?
- Microtecnica Srl, Microtecnica Srl
- What technology area does this patent fall under?
- Primary CPC classification C23C4/18. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 07 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).