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3 EP 2 657 481 A1 4 outside air exposed surface area of the exterior of each of the connection portion (tongue portion) of the turbine housing 01 and the shroud portion X of the turbine hous- ing 01 in which the tongue portion 045 is disposed to thereby increase heat radiation from the corresponding portions and reduce heat accumulated in the tongue por- tion 045. [0008] In order to solve the above problem, in a scroll structure for a radial turbine or a diagonal flow turbine configured such that a turbine rotor is rotationally driven by causing exhaust gas to flow from a spiral scroll portion formed in a turbine housing toward a rotor blade of the scroll portion in a radial direction and act on the rotor blade, then flow out in an axial direction, a concave por- tion as a heat radiation space is formed in a shroud portion formed between the scroll portion and a turbine chamber wall covering the rotor blade in a radial cross section of the radial turbine or the diagonal flow turbine, and the concave portion is formed in a circumferential direction. [0009] With the above configuration, it becomes pos- sible to downgrade high temperature oxidation resist- ance and thermal fatigue resistance of a material used for the turbine housing to achieve a reduction in cost by providing the heat radiation space in the shroud portion between the scroll portion and the turbine chamber. [0010] In addition, in the present invention, a radial cross-sectional shape of the scroll portion in which the exhaust gas flows in a direction orthogonal to a line join- ing a tongue portion separating a flow path, which leads to the scroll portion, from a rotor blade side flow path, which leads to the rotor blade, to an axis of the scroll portion is preferably formed of an oblong rectangular cross-sectional shape in which a length in a radial direc- tion is longer than a length in an axial direction. [0011] With the above configuration, the axial length of an exhaust gas flow cross section of the scroll portion is reduced, and hence the depth of a concave portion formed between the turbine chamber wall and the scroll portion is reduced, the size of an opening of the concave portion can be increased, it becomes easier to make the thickness on the housing side equal to that of the sur- rounding area during the formation of the turbine housing, solidification rejection during the formation is sup- pressed, and product accuracy is thereby stabilized. [0012] Further, in the present invention, the radial cross-sectional shape of the scroll portion is preferably configured such that a scroll width ratio A/B between a width A in the radial direction and a width B in an axial direction of the axis satisfies 1 < A/B ≤ 2. [0013] With the above configuration, by reducing the width in the axial direction by increasing the scroll width ratio (1 < A/B), the amount of projection of the housing in an exhaust gas flow-out direction is reduced, the thick- ness of the housing at the corresponding portion (the shroud portion) is reduced, the concave portion as the heat radiation space portion is formed to be large in size, and an improvement in the heat radiation effect of the shroud portion is thereby achieved. In addition, by having the scroll width ratio of A/B ≤ 2, it is possible to prevent the deterioration of mountability on an engine caused by an increase in the outer diameter of the scroll portion. Further, in a case where the cross-sectional area is not changed, when the width B is reduced, the surface area of the flow path is increased so that the flow resistance of the exhaust gas is increased, the performance of the turbo charger is degraded, and the weight is increased. However, it becomes possible to solve these problems with the above scroll width ratio. [0014] Furthermore, in the present invention, an in- clined portion in an exhaust gas flow direction of a tongue portion which separates a flow path leading to the scroll portion from a rotor blade side flow path leading to the rotor blade is preferably formed into a shape along a log- arithmic spiral. [0015] With the above configuration, the exhaust gas flown into the scroll portion is guided along the outer pe- riphery of the scroll portion, and hence, by forming the inclined portion in the flow direction of the tongue portion into the shape of the logarithmic spiral, a flow-out angle from the tongue portion and an exhaust gas flow-out an- gle to the rotor blade 3 match with each other so that it is possible to facilitate the exhaust gas flow in the scroll portion to fully deliver the performance of the turbo charg- er. In addition, the intersection angle of the scroll portion of the tongue portion and the flow path leading to the scroll portion is increased, and hence, by providing a cooling space at the corresponding portion, it is possible to sup- press an increase in the temperature of the tongue por- tion. [0016] It is made possible to downgrade high temper- ature oxidation resistance and thermal fatigue resistance of the material used for the turbine housing to achieve a reduction in cost by configuring the cross-sectional shape of the scroll portion such that the scroll width ratio α be- tween the width A in the radial direction and the width B in the axial direction of the axis satisfies 1 < A/B ≤ 2 to thereby increase the size of the concave portion in the shroud portion, promote convection of outside air, and facilitate heat radiation in not only the tongue portion but also the entire circumference of the shroud. In addition, it is made possible to promote the convection of outside air to facilitate the heat radiation in the tongue portion by forming the tongue portion wall shape in the exhaust gas flow direction into the shape of the logarith- mic spiral and providing the cooling space (corresponds to 79 of FIG. 2) at the corresponding portion. BRIEF DESCRIPTION OF THE DRAWINGS [0017] FIG. 1(A) is a cross-sectional view in a direction or- thogonal to the axis of a turbine rotor of a tongue 5 10 15 20 25 30 35 40 45 50 55 3PDF Image | EP 2 657 481 A1 EUROPEAN PATENT APP
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