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Compressor with dual outboard support bearings

A technology of compressors and bearings, applied in the field of compressors

Inactive Publication Date: 2010-06-30
NEW YORK AIR BRAKE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large number of motors in use, none of these solutions were successful given that they required major modifications to the motors

Method used

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  • Compressor with dual outboard support bearings
  • Compressor with dual outboard support bearings
  • Compressor with dual outboard support bearings

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Experimental program
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Embodiment Construction

[0017] The present bearing assembly and compressor are based on a theoretical study of the deformation of the crankshaft and the deformation of the compressor housing and the speed change during one revolution of the crankshaft caused by the electrical characteristics of the motor. Unlike in the above-mentioned patents, the present invention mainly solves the problem of motor friction by reducing the deformation of the crankshaft. Here, the deformations of the crankshaft, rotor and stator are synchronized such that the air gap between the rotor and stator remains constant. This is achieved by using one or more of the following: mating bearings, stiffer endshields or bearing housings, and stators secured directly to the endshields. A pair of bearings with a small distance between the two bearings is sufficient to synchronize the motion of the free end of the crankshaft, which in turn synchronizes the motion of the stator and rotor.

[0018] figure 1 A compressor 10 according ...

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PUM

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Abstract

A compressor includes a motor having a rotor mounted to a free end of a crank shaft and a stator in a motor housing, and a bearing assembly supporting the crank shaft on the crank shaft housing adjacent the motor housing. The bearing assembly includes a bearing housing mounted to the crank shaft housing and including a bore; and a pair of spaced bearings mounted in the bore of the bearing housingand receiving the crank shaft. The space between the bearings is selected to allow the free end of the crank shaft to deform in synchronization with the movement of the stator and maintain a gap between the rotor and stator over the operating range of the motor.

Description

technical field [0001] The present invention relates generally to compressors and, more particularly, to compressors that support the rotor of an electric motor at the end of the crankshaft so that the electric motor has no bearings of its own. Background technique [0002] In freight trains, especially in the U.S. and other countries where the Association of American Railroads (AAR) regulations are often used, direct-drive air compressors (where the rotor of the motor is pressed directly against the crankshaft of the air compressor) is very common. This structure concentrates the mass of the rotor at the free end of the crankshaft. This leads to a relatively low eigenfrequency and together with the elastic deformation of the crankshaft leads to a gyroscopic effect which in turn leads to a further reduction in the eigenfrequency. Thermal effects exacerbate this problem. [0003] Air compressors in diesel locomotives are driven over a wide rotational speed range (400 to 12...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B35/04F04B39/00F04B27/04
CPCF04B35/04F16C19/54F04B27/0404F04B39/0094
Inventor 迈克尔·哈特尔斯蒂芬·施奈特威廉·B·麦克迪
Owner NEW YORK AIR BRAKE CORP