CYLINDER COVER AND ANTICORROSION IMPROVING METHOD THEREOF

• Main Authors: KUBO DAICHI, IMAI HIROYUKI, SAKAI YOSHINARI, SAKANE YUTO, UENO TOMOHIRO, KUROKAWA HIDEAKI, MORIHASHI RYO, KAMEI YUJI, IWASAKI ISATO
• Format: Patent
• Language: English; Japanese
• Published: 02.04.2020
• Subjects: ALLOYS; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; COMBUSTION ENGINES; COOLING OF INTERNAL-COMBUSTION ENGINES; COOLING OF MACHINES OR ENGINES IN GENERAL; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; FERROUS OR NON-FERROUS ALLOYS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINE TOOLS; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; STEAM ENGINES; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS; WELDING; WORKING BY LASER BEAM

To provide a method for improving anticorrosion of a cylinder cover capable of effectively preventing corrosion of a seal region.SOLUTION: A method for improving anticorrosion of a cylinder cover, in which a port serving as an air supply port or an exhaust port is provided, and an annular cooling water flow passage is formed between the inner peripheral surface of the port and a valve seat ring by inserting the valve seat ring into the port, comprises forming a cladding layer with laser metal cladding by using a welding material made of a nickel-based alloy, a copper alloy, stainless steel, or a titanium alloy, in seal regions located on both sides of the cooling water flow passage on the inner peripheral surface of the port.SELECTED DRAWING: Figure 1 【課題】シール領域の腐食を効果的に防止することができるシリンダカバーの耐食性向上方法を提供する。【解決手段】給気ポートまたは排気ポートであるポートを有し、ポートに弁座リングが挿入されることによってポートの内周面と弁座リングとの間に環状の冷却水流路が形成されるシリンダカバーの耐食性を向上させる方法であって、ポートの内周面における冷却水流路の両側に位置するシール領域に、レーザ金属肉盛によって、ニッケル基合金、銅合金、ステンレスまたはチタン合金からなる溶接材を用いて肉盛層を形成する。【選択図】図１