Fan shield and bearing housing for air cycle machine

A bearing housing for an air cycle machine, the bearing housing comprising:

• a bearing housing body that defines a cylindrical portion that extends around a central axis and an annular flange at one end of the cylindrical portion, the annular flange includes a first attachment opening, a second attachment opening and a third attachment opening for attaching a fan shield body thereto, and the attachment openings are non-uniformly circumferentially spaced around the annular flange.

A method of installing a fan shield and a bearing housing on an air cycle machine, the method comprising:

• securing an annular flange of a bearing housing body between a fan shield body and a structure of an air cycle machine such that, together, the fan shield body and the bearing housing body establish a fan air flow path, the fan shield body is in the general shape of a frustum of a cone having curved sides that extend around a central axis, the curved sides define a radius of curvature and a center point of curvature that corresponds to the radius of curvature, the center point of curvature is an axial distance DA from a large end of the fan shield body and a radial distance DR from the central axis such that a ratio DR/DA is between 1.160 and 1.360, and the bearing housing body defines a cylindrical portion that extends around a central axis and the annular flange at one end of the cylindrical portion, the annular flange includes a first attachment opening, a second attachment opening and a third attachment opening for attaching the fan shield body thereto, and the attachment openings are non-uniformly circumferentially spaced around the annular flange.