Shaft assembly for a high-speed test rig
AssigneeKaydon Ring & Seal, Inc.
InventorSanjay Kumar Baheti
Life of this patent
Estimating the term…
Abstract
A high-speed test rig is for rotationally testing articles such as seals, bearings, couplers, etcetera. The test rig includes a shaft extension sized to receive a test article annular body about an outer surface and a primary shaft including of a solid rod. The rod has two outer circumferential base surface sections each having an outside diameter and disposed within a separate bearing such that the shaft assembly is rotatable about an axis. The rod has a first end coupled with the shaft extension, such that a cantilever beam is defined between the shaft extension outer end and a first bearing, and a second end coupled with a motor shaft.
Claims20
A high-speed test rig for testing articles at rotational speeds between thirty thousand rotations per minute (30,000 rpm) and forty-two thousand two hundred twelve rotations per minute (42,212 rpm), each test article including a generally annular body, the test rig comprising:
- a housing;
- first and second bearings disposed within the housing and spaced apart along a central axis;
- a shaft extension having a centerline, opposing first and second axial ends spaced apart along the centerline and an outer circumferential surface, the shaft extension being sized to receive the test article annular body about the extension outer surface;
- and
- a primary shaft including a solid rod formed of a material having a specific modulus with a value greater than twenty million m2/s2, the rod having opposing first and second axial ends and first and second outer circumferential base surface sections, at least a portion of the first base surface section being disposed within the first bearing and at least a portion of the second base surface section being disposed within the second bearing such that the primary shaft is rotatable about the central axis, the rod first axial end being configured to couple the shaft extension first axial end with the primary shaft such that the extension centerline is coincident with the central axis and a cantilever beam is defined between the shaft extension second axial end and the first bearing, the rod second axial end being configured to couple a motor shaft with the primary shaft, the rod having an overall axial length between the rod first and second axial ends and the first and second base outer surface sections each having an outside diameter equal to or lesser than any other outer surface section of the rod, the rod being sized such that a ratio of the base surface section outside diameter to the rod axial length is between about 0.12 and 0.16.
A shaft assembly for a high-speed test rig for testing articles at rotational speeds between thirty thousand rotations per minute (30,000 rpm) and forty-three thousand rotations per minute (43,000 rpm), each test article including a generally annular body, the rig including a housing and first and second bearings disposed within the housing and spaced apart along a central axis, the shaft assembly comprising:
- a shaft extension having a centerline, opposing first and second axial ends spaced apart along the centerline and an outer circumferential surface, the shaft extension being sized to receive the test annular body about the extension outer surface;
- and
- a primary shaft including a solid rod having opposing first and second axial ends, a first base outer circumferential surface section disposed within the first bearing and a second base outer circumferential surface section disposed within the second bearing such that the primary shaft is rotatable about the central axis, a central collar portion with an outer circumferential surface and opposing first and second radial end surfaces, the first and second collar end surfaces being engageable by a separate one of two thrust bearings, the rod first axial end being configured to couple the shaft extension first axial end with the primary shaft such that the extension centerline is coincident with the central axis and a cantilever beam is defined between the shaft extension second axial end and the first bearing, the rod second axial end being configured to couple a motor shaft with the primary shaft;
- wherein the rod has an overall axial length between the rod first and second axial ends, the first and second base outer surface sections each have an outside diameter equal to or lesser than any other outer surface section of the rod, the collar has an axial length between the two collar end surfaces, and the collar outer surface section has an outside diameter;
- and
- wherein the rod is sized such that a ratio of the base surface section outside diameter to the rod axial length is between about 0.12 and 0.16, the collar is sized such that a ratio of the collar outside diameter to the base surface section outside diameter is between about 2.0 and about 2.3 and a ratio of the collar length to the rod overall length is between about 0.12 and about 0.16.
Dependencies are inferred from the claim text.