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US 11,149,696 B2Granted
Gas tube for EGR cooler having improved anti-corrosive characteristics
AssigneeKorens Co., Ltd.
InventorHyung Geun Cho
Life of this patent
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Abstract
A gas tube for an EGR cooler has such a structure that a metal plate having a flat plate shape is bent in a tube shape. The metal plate includes a core material, a sheath material clad on one surface of the core material or on both surfaces thereof, and an intermediate material clad between the core material and the sheath material so as to prevent magnesium from diffusing from the core material to the sheath material. The core material includes copper (Cu), silicon (Si), iron (Fe), magnesium (Mg), manganese (Mn), titanium (Ti), and aluminum (Al).
Claims3
A gas tube for an EGR cooler having a structure in which a metal plate having a flat-plate shape is bent in a tube shape,
- wherein the metal plate comprises a core material, a sheath material clad on one surface of the core material or on both surfaces thereof, and an intermediate material clad between the core material and the sheath material so as to prevent magnesium from diffusing from the core material to the sheath material, and the core material consists of 0.4-0.6 wt % of copper (Cu), 0.6 wt %-0.8 wt % of silicon (Si), 0.4 wt %-0.6 wt % of iron (Fe), 0.3 wt %-0.4 wt % of magnesium (Mg), 0.4 wt %-1.1 wt % of manganese (Mn), 0.1 wt %-0.2 wt % of titanium (Ti), and the remainder of aluminum (Al),
- wherein the intermediate material is A3003 aluminum alloy or A0140 aluminum alloy, and the sheath material is A4045 aluminum alloy
- wherein the metal plate comprises an upper plate, a lower plate, a downward first side plate extending downwards from a first side of the upper plate in a widthwise direction, an upward first side plate extending upwards from a first side of the lower plate in the widthwise direction and overlapping the downward first side plate, and a second side plate connecting second sides of the upper and lower plates in the widthwise direction to each other, and the downward first side plate and the upward first side plate are bonded through a brazing process,
- wherein the downward first side plate comprises a lower bent part overlapping the lower plate, and the upward first side plate comprises an upper bent part overlapping the upper plate, and
- wherein a stair-shaped step is formed on a lower surface of the first side of the lower plate in the widthwise direction, and the lower bent part is seated on the stair-shaped step, so that an outer surface of the lower plate and an outer surface of the lower bent part form one continuous plane without any gap between the outer surface of the lower plate and the outer surface of the lower bent part.
2 more elements
A gas tube for an EGR cooler having a structure in which a metal plate having a flat-plate shape is bent in a tube shape,
- wherein the metal plate comprises a core material, a sheath material clad on one surface of the core material or on both surfaces thereof, and an intermediate material clad between the core material and the sheath material so as to prevent magnesium from diffusing from the core material to the sheath material, and the core material consists of 0.4-0.6 wt % of copper (Cu), 0.6 wt %-0.8 wt % of silicon (Si), 0.4 wt %-0.6 wt % of iron (Fe), 0.3 wt %-0.4 wt % of magnesium (Mg), 0.4 wt %-1.1 wt % of manganese (Mn), 0.1 wt %-0.2 wt % of titanium (Ti), and the remainder of aluminum (Al),
- wherein the intermediate material is A3003 aluminum alloy or A0140 aluminum alloy, and the sheath material is A4045 aluminum alloy
- wherein the metal plate comprises an upper plate, a lower plate, a downward first side plate extending downwards from a first side of the upper plate in a widthwise direction, an upward first side plate extending upwards from a first side of the lower plate in the widthwise direction and overlapping the downward first side plate, and a second side plate connecting second sides of the upper and lower plates in the widthwise direction to each other, and the downward first side plate and the upward first side plate are bonded through a brazing process,
- wherein the downward first side plate comprises a lower bent part overlapping the lower plate, and the upward first side plate comprises an upper bent part overlapping the upper plate, and
- wherein each of the lower bent part and the upper bent part is shaped such that a thickness thereof is reduced towards an end, thereby an outer surface of the lower plate and an outer surface of the lower bent part form one continuous plane without any gap between the outer surface of the lower plate and the outer surface of the lower bent part.
2 more elements
Dependencies are inferred from the claim text.