Secondary Air Charger

A secondary air charger comprising:

• a bearing housing;
• a turbine shaft extending in an axial direction of the bearing housing and having bearing seats;
• a first and a second rolling bearings arranged in the bearing housing and supporting the turbine shaft rotatably in the bearing housing, wherein the first and second rolling bearings are positioned at an axial spacing relative to one another and wherein the first and second rolling bearings each have an inner ring arranged on the bearing seats of the turbine shaft;
• a spacer device for determining the axial spacing of the first and second rolling bearings arranged on the turbine shaft;
• wherein the turbine shaft comprises a base member and at least one sleeve;
• wherein the base member has a cylindrical section that is continuous in the axial direction, wherein the cylindrical section is provided in an area where the bearing seats are located;
• and
• wherein the at least one sleeve is pushed onto the cylindrical section for forming the spacer device between the bearing seats.