Rotary seals
AssigneeMicrotecnica S.R.L.
InventorMarco Gianfranceschi
Life of this patent
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Abstract
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.
Claims8
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 Ra 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.
Dependencies are inferred from the claim text.