Secondary Air Charger

Abstract

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

1 .- 10 . (canceled) 
   
   
       11 . 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.   
   
   
       12 . The secondary air charger according to  claim 11 , wherein the inner rings of the first and second rolling bearings and the at least one sleeve are separate parts. 
   
   
       13 . The secondary air charger according to  claim 11 , wherein at least one of the inner rings of the first and second rolling bearings is integrally formed with the at least one sleeve. 
   
   
       14 . The secondary air charger according to  claim 13 , wherein the inner ring of the first rolling bearing is formed integrally with the at least one sleeve, wherein the at least one sleeve extends across the entire axial spacing, and wherein the second rolling bearing is a standard rolling bearing. 
   
   
       15 . The secondary air charger according to  claim 13 , wherein the inner rings of the first and second rolling bearings each are formed integrally with the at least one sleeve. 
   
   
       16 . The secondary air charger according to  claim 15 , wherein the inner rings with the integrally formed at least one sleeve are substantially identically configured, wherein the integrally formed sleeves face one another and rest against one another in the axial direction. 
   
   
       17 . The secondary air charger according to  claim 11 , wherein the at least one sleeve is pressed onto the cylindrical section. 
   
   
       18 . The secondary air charger according to  claim 11 , wherein the least one sleeve is surrounded radially outwardly by a bushing secured to the bearing housing and forming an intermediate sealing gap. 
   
   
       19 . The secondary air charger according to  claim 18 , wherein the bushing is configured as a spring action support bushing that is acting in the axial direction onto outer rings of the first and second rolling bearings. 
   
   
       20 . The secondary air charger according to  claim 11 , wherein the first and second rolling bearings are permanent-lubricated ball bearings.