# US 2015/0176518 A1 · Cylinder for application on an internal combustion engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0176518 A1 - Document ID: US20150176518A1 - Status: Published application - Kind: A1 - Application number: 14/403,633 - Filed: 2013-05-24 - Published: 2015-06-25 - Earliest claimed: 2012-05-25 - Assignees: Mahle Metal Leve S/A; Mahle International GmbH - Applicants: Mahle -Metal Leve S/A; Mahle International GbmH - Inventors: Samantha Uehara; Paulo J. Da Rocha Mordente; Edney D. Rejowski - Web page: https://patentgrep.com/patent/US20150176518A1 ## CPC - F02F 1/18: Other cylinders - C23C 16/0254: {Physical treatment to alter the texture of the surface, e.g. scratching or polishing} - C23C 16/26: Deposition of carbon only - C23C 30/00: Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) - F02F 1/004: {Cylinder liners (F02F1/08, F02F1/16 take precedence)} - F02F 1/20: characterised by constructional features providing for lubrication - F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) ## Abstract A cylinder for an internal combustion engine may include a metallic cylinder body and an amorphous diamond-like hard carbon film disposed on an internal peripheral surface of the cylinder body. The amorphous diamond-like carbon film may include a roughness ranging from Rz 0.5 μm to Rz 4.0 μm. ## Claims ### Claim 1 A cylinder for an internal combustion engine, comprising: a metallic cylinder body and an amorphous diamond-like hard carbon film disposed on an internal peripheral surface of the cylinder body, wherein the amorphous diamond-like carbon film includes a roughness ranging from Rz 0.5 μm to Rz 4.0 μm. ### Claim 2 (depends on 1) The cylinder according to claim 1, wherein the internal peripheral surface of the cylinder body receives a surface finish in at least two polishing steps before receiving the amorphous diamond-like carbon film. ### Claim 3 (depends on 2) The cylinder according to claim 2, wherein the polishing angle ranges from 40 to 150 degrees. ### Claim 4 (depends on 1) The cylinder according to claim 1, wherein the roughness of the amorphous diamond-like carbon film includes valleys and peaks. ### Claim 5 (depends on 4) The cylinder according to claim 4, wherein the valleys include an average valley roughness that is at least three times higher than an average peak roughness of the peaks. ### Claim 6 (depends on 1) The cylinder according to claim 1, wherein the amorphous diamond-like carbon film includes a hardness ranging from 1000 Hv to 3000 Hv. ### Claim 7 (depends on 1) The cylinder according to claim 1, wherein the amorphous diamond-like carbon film includes a thickness ranging from 1 μm to 30 μm. ### Claim 8 (depends on 1) The cylinder according to claim 1, wherein a work surface of the amorphous diamond-like carbon film includes at least 99% of carbon or carbon and hydrogen. ### Claim 9 (depends on 1) The cylinder according to claim 1, wherein the cylinder body is composed of a ferrous metal. ### Claim 10 (depends on 2) The cylinder according to claim 2, wherein the roughness of the amorphous diamond-like carbon film includes valleys and peaks. ### Claim 11 (depends on 3) The cylinder according to claim 3, wherein the roughness of the amorphous diamond-like carbon film includes valleys and peaks. ### Claim 12 (depends on 2) The cylinder according to claim 2, wherein the cylinder body is constituted by ferrous metal. ### Claim 13 (depends on 2) The cylinder according to claim 2, wherein a hardness of the amorphous diamond-like carbon film ranges from 1000 Hv to 3000 Hv. ### Claim 14 (depends on 3) The cylinder according to claim 3, wherein a hardness of the amorphous diamond-like carbon film ranges from 1000 Hv to 3000 Hv. ### Claim 15 (depends on 4) The cylinder according to claim 4, wherein a hardness of the amorphous diamond-like carbon film ranges from 1000 Hv to 3000 Hv. ### Claim 16 A cylinder for an internal combustion engine, comprising: a metallic cylinder body having an internal peripheral surface; an amorphous diamond-like carbon film disposed on the internal peripheral surface, the amorphous diamond-like carbon film including a roughness ranging from Rz 0.5 μm to Rz 4.0 μm, the roughness including valleys and peaks, wherein the valleys include an average valley roughness that is at least three times greater than an average peak roughness of the peaks; wherein the amorphous diamond-like carbon film includes a hardness ranging from 1000 Hz to 3000 Hz and a thickness between 1 μm and 30 μm. ### Claim 17 (depends on 16) The cylinder according to claim 16, wherein the internal peripheral surface is treated in at least two honing steps prior to receiving the amorphous diamond-like carbon film. ### Claim 18 (depends on 17) The cylinder according to claim 17, wherein the honing angle ranges from 40 to 150 degrees. ### Claim 19 (depends on 16) The cylinder according to claim 16, wherein the amorphous diamond-like carbon film has a work surface including at least 99% of carbon or carbon and hydrogen. ### Claim 20 (depends on 16) The cylinder according to claim 16, wherein the cylinder body is composed of a ferrous metal.