Exhaust valve spindle for an exhaust valve in an internal combustion engine
AssigneeMan Diesel & Turbo, Filial Af Man Diesel & Turbo SE, Tyskland
InventorUffe Bihlet
Life of this patent
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Abstract
An exhaust valve spindle for an exhaust valve in an internal combustion engine has a shaft and a valve disc at the lower end of the shaft, which valve disc at its upper surface has a seat area. The seat area is of a seat material comprising at least from 34.0 to 44.0% Cr, an aggregate amount of Nb and Ta in the range from at least 2.8 to 6.1%, from 0.3 to 2.0% Ti, at the most 0.2% Al, at the most 0.04% B, at the most 0.8% Fe, at the most 0.04% C, at the most 0.4% Si, and a balance of Ni, where the amount of Ti+Nb+0.5×Ta is in the range from 3.4 to 6.6%, and where the amount of Nb+0.5×Ta is less than 3.0% if the amount of Ti is larger than 1.5%.
Claims20
An exhaust valve spindle for an exhaust valve in an internal combustion engine, which exhaust valve spindle has a shaft and a valve disc at a lower end of the shaft, which valve disc at its upper surface has a seat area, wherein the valve disc is of stainless steel and the seat area is of a nickel-based alloy comprising, stated in percent-by-weight and apart from common impurities and inevitable residual amounts of deoxidizing components, at least from 34.0 to 44.0% Cr, an aggregate amount of Nb and Ta in the range from at least 3.2 to 6.1%, from 0.3 to 2.0% Ti, at the most 0.05% Al, at the most 0.04% B, at the most 0.8% Fe, at the most 0.04% C, at the most 0.4% Si, and a balance of Ni, where the amount of Ti+Nb +0.5×Ta is in the range from 3.4 to 6.6%, and where the amount of Nb+0.5×Ta is less than 3.0% if the amount of Ti is larger than 1.5%.
An exhaust valve spindle for an exhaust valve in an internal combustion engine, which exhaust valve spindle has a shaft and a valve disc at a lower end of the shaft, which valve disc at its upper surface has a seat area, wherein the valve disc is of a base material and the seat area is of a seat material different from the base material, which seat material is of a nickel-based alloy comprising, stated in percent-by-weight and apart from common impurities and inevitable residual amounts of deoxidizing components, at least from 34.0 to 44.0% Cr, an aggregate amount of Nb and Ta in the range from at least 2.8 to 6.1%, from 0.3 to 2.0% Ti, at the most 0.2% Al, at the most 0.04% B, at the most 0.8% Fe, at the most 0.04% C, at the most 0.4% Si, and a balance of Ni, where the amount of Ti+Nb+0.5×Ta is in the range from 3.4 to 6.6%, and where the amount of Nb+0.5×Ta is less than 3.0% if the amount of Ti is larger than 1.5%.
Dependencies are inferred from the claim text.