Patent ID: 9010109
Filing Date: 2015-04-21
Classification: F01D,F02B,F16K,Y02T

Abstract:
1. An assembly comprising: a turbine housing that comprises a bore, a wastegate seat and a wastegate passage that extends to the wastegate seat; a bushing configured for receipt by the bore; a rotatable wastegate shaft configured for receipt by the bushing; a wastegate arm extending from the wastegate shaft; and a wastegate plug extending from the wastegate arm wherein the wastegate plug comprises a toroidal portion with a profile defined in part by a portion of a torus that defines a wastegate plug axis and that contacts the wastegate seat to cover the wastegate passage in a closed state, and wherein the wastegate plug comprises a modified sphere portion with a profile defined in part by a portion of a modified sphere that defines a clearance with respect to the wastegate seat in an open state, wherein the modified sphere portion comprises, in a plane perpendicular to the wastegate plug axis, a portion of the plug proximal the wastegate shaft on a wastegate shaft side and a portion of the plug opposite the wastegate shaft on a front side and wherein, in the plane perpendicular to the wastegate plug axis, a wastegate shaft side radial dimension of the profile of the modified sphere portion is less than a front side radial dimension of the profile of the modified sphere portion.