Journal foil bearing system with foil support insert member
A journal foil bearing system includes a journal member with a bore and an internal groove. The system includes a shaft received within the bore and supported for rotation relative to the journal member about an axis. The groove extends substantially along the axis. The system also includes at least one biasing foil and a top foil member with at least one arch-bound top foil. The top foil member has a top foil first end and a top foil second end. Additionally, the system includes a foil support insert member that is received within the groove. The foil support insert member includes a spacer member that is disposed between the top foil first and second ends. The spacer member maintains the top foil first and second ends separated, at least, at a distance.
1. A journal foil bearing system comprising:
a journal member with a bore and an internal groove within the bore;
a shaft received within the bore and supported for rotation relative to the journal member about an axis, the groove extending substantially along the axis;
at least one biasing foil that is received radially between the journal member and the shaft and that extends circumferentially about the axis;
a top foil member received radially between the at least one biasing foil and the shaft, the top foil member including a top foil first end and a top foil second end; and
a foil support insert member that is received within the groove, the foil support insert member including a spacer member that is disposed between the top foil first end and the top foil second end, the spacer member separating the top foil first end and the top foil second end so that the top foil first end and the top foil second end are maintained, at least, at a distance apart from one another.
2. The journal foil bearing system of claim 1 , wherein the foil support insert member includes a first control surface and a second control surface that are substantially parallel and spaced apart, the first control surface abutting the top foil first end and the second control surface abutting the top foil second end.
3. The journal foil bearing system of claim 2 , wherein the foil support insert member includes a tangential portion that extends tangentially with respect to a circle that is centered on the axis, the tangential portion being substantially normal to the first control surface and the second control surface.
4. The journal foil bearing system of claim 1 , wherein the spacer member extends radially with respect to the axis; and
wherein the foil support insert member includes a tangential portion that extends perpendicularly with respect to the spacer member.
5. The journal foil bearing system of claim 4 , wherein the spacer member includes a projection that projects perpendicularly to the spacer member, the projection abutting one of the top foil first end and the top foil second end.
6. The journal foil bearing system of claim 1 , wherein the foil support insert member includes a longitudinal end; and
further comprising a retainer member that engages the longitudinal end to retain the foil support insert member in an axial direction and in a radial direction with respect to the axis.
7. The journal foil bearing system of claim 6 , wherein the longitudinal end includes an axial projection; and
wherein the retaining member abuts the axial projection to retain the foil support insert member.
8. The journal foil bearing system of claim 1 , wherein the foil support insert member defines a line of symmetry, the line of symmetry extending radially with respect to the axis.
9. The journal foil bearing system of claim 1 , wherein the foil support insert member has an asymmetrical cross section along a line normal to the axis.
10. The journal foil bearing system of claim 1 , further comprising a compressor wheel that is supported on the shaft.
11. The journal foil bearing system of claim 1 , wherein the internal groove has a longitudinal axis that is substantially parallel to the axis, and wherein the internal groove is defined by a plurality of substantially flat surfaces that extend along the longitudinal axis.
12. A turbomachine comprising:
a housing;
a rotating group that includes a shaft; and
a journal foil bearing system that supports the shaft for rotation within the housing, the journal foil bearing system including:
a journal member that is fixed to the housing, the journal member having a bore and an internal groove within the bore, the shaft received within the bore and supported for rotation relative to the journal member about an axis, the groove extending substantially along the axis;
at least one biasing foil that is received radially between the journal member and the shaft and that extends circumferentially about the axis;
a top foil member received radially between the at least one biasing foil and the shaft, the top foil member including a top foil first end and a top foil second end; and
a foil support insert member that is received within the groove, the foil support insert member including a spacer member that is disposed between the top foil first end and the top foil second end, the spacer member separating the top foil first end and the top foil second end so that the top foil first end and the top foil second end are maintained, at least, at a distance apart from one another.
13. The turbomachine of claim 12 , further comprising a compressor section with a compressor wheel that is attached to the shaft, the compressor section configured to compress a compressible fluid flowing therethrough.
14. The turbomachine of claim 13 , further comprising a turbine section with a turbine wheel that is attached to the shaft, the turbine wheel configured to be driven by a driving fluid flowing therethrough to thereby drivingly rotate the compressor wheel.
15. The turbomachine of claim 12 , wherein the foil support insert member includes a first control surface and a second control surface that are substantially parallel and spaced apart, the first control surface abutting the top foil first end and the second control surface abutting the top foil second end.
16. The turbomachine of claim 12 , wherein the spacer member includes a projection that projects perpendicularly to the spacer member, the projection abutting one of the top foil first end and the top foil second end.
17. The turbomachine of claim 12 , wherein the foil support insert member includes a longitudinal end; and
further comprising a retainer member that engages the longitudinal end to retain the foil support insert member in an axial direction and in a radial direction with respect to the axis.
18. The turbomachine of claim 12 , wherein the foil support insert member defines a line of symmetry, the line of symmetry extending radially with respect to the axis.
19. The turbomachine of claim 12 , wherein the foil support insert member has an asymmetrical cross section along a line normal to the axis.
20. A method of manufacturing a journal foil bearing system comprising:
receiving a shaft within a bore of a journal member, the shaft having an axis, the bore having an internal groove;
disposing at least one biasing foil radially between the journal member and the shaft, and extending the at least one biasing foil circumferentially about the axis;
providing a top foil with a first end, a second end, and an intermediate portion that extends circumferentially about the axis between the first end and the second end, including disposing the intermediate portion radially between the at least one biasing foil and the shaft;
inserting a foil support insert member within the groove, the foil support insert member including a spacer member; and
disposing the spacer member between the first end and the second end of the top foil to separate the first end and the second end so that the first end and the second end are maintained, at least, at a distance apart from one another.