Patent ID: 7802429
Filing Date: 2010-09-28
Classification: F01D,F02C,F05D

Abstract:
1. An exhaust turbo-supercharger comprising: an exhaust turbine housing including therein a spiral channel and a turbine-accommodating chamber at an innermost peripheral part of the spiral channel; an exhaust turbine provided in the turbine-accommodating chamber so that the axial line of the exhaust turbine is parallel to that of the spiral channel; a shaft that is concentrically connected to one side of the exhaust turbine in the axial line direction; a bearing housing disposed at the side of the exhaust turbine in the axial line direction so as to be adjacent to the exhaust turbine housing; a bearing that is provided in the bearing housing and that rotatably supports the shaft around the axial line; and a heat shield component immovably interposed between the exhaust turbine housing and the bearing housing and arranged with the exhaust turbine housing and the bearing housing so as to seal a space between the turbine housing and the bearing housing to prevent the ingress of hot exhaust gas into the space, wherein the heat shield component constitutes a part disposed near the entrance of the turbine-accommodating chamber, the part being a part of an inner wall surface of the spiral channel, a circumferential part of the heat shield component the circumferential part protruding into the spiral channel, and wherein when the width of the spiral channel in the protruding direction of the protruding part is represented by 2 L and the amount of protrusion of the protruding part is represented by X, a fixed relationship 0.08235 L≦X≦0.6983 L is satisfied.