TURBINE HOUSING AND TURBOCHARGER

摘要

A turbine housing includes a scroll passage provided with a housing tongue. A groove portion (a notch) is formed in a wall surface on the scroll passage side of the housing tongue. The groove portion is located at a position close to an edge portion on the flange side of the wall surface. The groove portion extends from a tip end side of the housing tongue in an extending direction of the scroll passage. In a cross section orthogonal to the extending direction of the scroll passage, a curvature radius of the deepest part of the groove portion is smaller than a minimum curvature radius of the wall surface of the housing tongue.

主权项

1. A turbine housing of a turbocharger to be attached to a bearing housing thereof, comprises:
an wheel housing unit configured to house a turbine wheel; a flange including an opening to allow insertion of the turbine wheel into the wheel housing unit; and a scroll passage formed along an outer periphery of the wheel housing unit, and provided with a roll-start portion communicating with a gas introduction passage for introducing a gas into the wheel housing unit, and a roll-end portion communicating with the wheel housing unit, wherein the scroll passage includes a housing tongue formed along the outer periphery of the wheel housing unit in such a manner as to provide a partition between the roll-end portion and the gas introduction passage, the housing tongue has a thickness which is gradually reduced toward its tip end side, and includes a groove portion formed in a wall surface on the scroll passage side and extending from the tip end side in an extending direction of the scroll passage, and the groove portion is located at a position close to an edge portion of the flange.