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In a centrifugal compressor the drive shaft of the compressor is driven by a step up gear mechanism including an input shaft driving a central drive gear, an output gear mounted on the compressor drive shaft, and three gear trains extending from the central drive gear and the output gear. Two impell

In a centrifugal compressor the drive shaft of the compressor is driven by a step up gear mechanism including an input shaft driving a central drive gear, an output gear mounted on the compressor drive shaft, and three gear trains extending from the central drive gear and the output gear. Two impellers to provide two stages of compression are mounted back to back on the inner end of the compressor drive shaft. The input shaft of the gear train mechanism comprises a quill shaft surrounded by a hollow shaft fixed by friction to the inner end of the quill shaft. A rubbing seal is provided between the outer end of the hollow shaft and the compressor casing. The compressor drive shaft is supported on its outer end by the gear train mechanisms and at its middle and near its inner end by angular contact ball bearings. The portion of the compressor drive shaft between the ball bearing at the middle of the shaft and the outer end of the drive shaft is a flexible quill shaft.

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In a centrifugal compressor the drive shaft of the compressor is driven by a step up gear mechanism including an input shaft driving a central drive gear, an output gear mounted on the compressor drive shaft, and three gear trains extending from the central drive gear and the output gear. Two impell

In a centrifugal compressor the drive shaft of the compressor is driven by a step up gear mechanism including an input shaft driving a central drive gear, an output gear mounted on the compressor drive shaft, and three gear trains extending from the central drive gear and the output gear. Two impellers to provide two stages of compression are mounted back to back on the inner end of the compressor drive shaft. The input shaft of the gear train mechanism comprises a quill shaft surrounded by a hollow shaft fixed by friction to the inner end of the quill shaft. A rubbing seal is provided between the outer end of the hollow shaft and the compressor casing. The compressor drive shaft is supported on its outer end by the gear train mechanisms and at its middle and near its inner end by angular contact ball bearings. The portion of the compressor drive shaft between the ball bearing at the middle of the shaft and the outer end of the drive shaft is a flexible quill shaft. ange extending from said second extremity of said cylindrical portion; said cylindrical portion defining said aperture for the reception therethrough of said threaded portion; said plurality of protrusions extending radially inwards from said cylindrical portion; said plurality of protrusions providing an interference fit with said annular collar when said threaded portion is moved axially through said aperture; said plurality of protrusions including: a first and a second protrusion; and a first circumferential distance between said first and said second protrusions being less than a second circumferential distance between said first and said second protrusions, said first and second distances being equal to a circumference of said annular collar. 25. A fastener assembly device as set forth in claim 24, wherein said head includes an integral spacer. 26. A fastener assembly device as set forth in claim 24, further including: a grommet which defines a hole for the reception therethrough of the washer so that the grommet, the washer and the fastener combine to form the coaxial fastener assembly device.