Assembly with bearings and spacer
View Patent ↗A method can include providing a turbocharger housing that includes a bore; providing a spacer; providing a shaft and wheel assembly with a first rolling element bearing assembly seated on a first portion of a shaft of the shaft and wheel assembly; providing a second rolling element bearing assembly; interference-fitting the spacer into the bore; inserting a free end of the shaft into the bore and through the spacer; and inserting the second rolling element bearing assembly into the bore and seating the second rolling element bearing assembly on a second portion of the shaft such that the spacer is disposed intermediate the first portion of the shaft and the second portion of the shaft.
1. A turbocharger comprising:
a housing that comprises a through bore formed at least in part by a turbine side bore wall, a compressor side bore wall and a spacer bore wall disposed between the turbine side bore wall and the compressor side bore wall;
a fully floating turbine side rolling element bearing assembly disposed adjacent the turbine side bore wall of the through bore of the housing wherein the turbine side rolling element bearing assembly comprises an outer race and wherein a radial clearance exists between the outer race and the turbine side bore wall of the through bore of the housing;
a fully floating compressor side rolling element bearing assembly disposed adjacent the compressor side bore wall of the through bore of the housing wherein the compressor side rolling element bearing assembly comprises an outer race and wherein a radial clearance exists between the outer race and the compressor side bore wall of the through bore of the housing; and
a spacer secured in the housing between the turbine side rolling element bearing assembly and the compressor side rolling element bearing assembly via an interference fit with the spacer bore wall of the through bore of the housing wherein the spacer forms a turbine side axial stop that limits the axial position of the outer race of the turbine side rolling element bearing assembly and forms a compressor side axial stop that limits the axial position of the outer race of the compressor side rolling element bearing assembly wherein the spacer comprises a compressor side axial face, a turbine side axial face and a slot that extends axially inwardly from one of the axial faces wherein the slot is configured for a tool that positions the spacer.
2. The turbocharger of claim 1 wherein the spacer comprises a recessed surface on an insertion end and wherein the slot extends axially inwardly from the one of the axial faces that is a trailing end.
3. The turbocharger of claim 1 wherein the spacer comprises a lubricant outlet opening.
4. The turbocharger of claim 1 wherein the turbine side rolling element bearing assembly comprises a ball bearing assembly.
5. The turbocharger of claim 1 wherein the compressor side rolling element bearing assembly comprises a ball bearing assembly.
6. The turbocharger of claim 1 further comprising a spring disposed in a bore of the spacer.
7. The turbocharger of claim 6 wherein the spring comprises a wave spring.
8. The turbocharger of claim 1 wherein a static force exists between the spacer and the spacer bore wall of the through bore of the housing to secure the spacer and wherein the static force exceeds an operational axial thrust force for the turbocharger.
9. The turbocharger of claim 1 wherein the shaft comprises a portion of a shaft and wheel assembly.
10. The turbocharger of claim 1 wherein the turbine side rolling element bearing assembly comprises an inner race fit to the shaft.
11. The turbocharger of claim 1 wherein the compressor side rolling element bearing assembly comprises an inner race fit to the shaft.
12. The turbocharger of claim 1 comprising a compressor wheel connected to the shaft.