US 9,810,298 B2
Rotary seals
Marco Gianfranceschi, Turin (IT)
Assigned to MICROTECNICA S.R.L., Turin (IT)
Filed by Microtecnica S.r.l, Turin (IT)
Filed on May 6, 2016, as Appl. No. 15/148,145.
Claims priority of application No. 15167765 (EP), filed on May 14, 2015.
Prior Publication US 2016/0333996 A1, Nov. 17, 2016
Int. Cl. C23C 22/24 (2006.01); F16J 15/34 (2006.01); F16H 25/24 (2006.01); C23C 4/18 (2006.01); C23C 4/11 (2016.01); C23C 4/134 (2016.01); F16H 25/22 (2006.01); F16J 15/18 (2006.01)
CPC F16H 25/2418 (2013.01) [C23C 4/11 (2016.01); C23C 4/134 (2016.01); C23C 4/18 (2013.01); F16H 25/2204 (2013.01); F16J 15/181 (2013.01); F16H 2025/249 (2013.01)] 8 Claims
OG exemplary drawing
 
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 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.