Exhaust gas turbocharger with a rotor

Abstract

An exhaust gas turbocharger may include a bearing housing and a rotor. The rotor may have a shaft mounted in the bearing housing via two radial bearing bushes. Each radial bearing bush may have an inner surface facing the shaft. The inner surface may have a single chamfer, where the single chamfers of the two radial bearing bushes face one another, or two chamfers, where one of the two chamfers for each of the two radial bearing bushes facing one another are larger than the other of the two chamfers for each of the two radial bearing bushes facing away from one another.

Description

technical field [0001] The invention relates to an exhaust gas turbocharger according to the preamble of claim 1 comprising a rotor, the shaft of which is mounted in a bearing housing via two radial bearing bushes. The invention also relates to a radial bearing bush for such an exhaust gas turbocharger. Background technique [0002] During operation, spent turbochargers are exposed to rotational speeds well in excess of 100,000 rpm. Typically, hydrodynamic bearings are used as radial bearings, comprising two floating bearing bushes or a so-called single bushing installation. In this case, an undesired characteristic of the hydrodynamic installation is that an unstable rotational movement of the shaft as well as a rotational movement of the rotor may occur through the flow effect of the oil film formed between the bearing bushing and the shaft of the rotor, whereby, at the most In poor cases, the rotor performs a stirring or oscillating motion. In order to reduce this risk...

AI Technical Summary

Problems solved by technology

In order to reduce this risk, it is ideal to place the two radial bearing bushes as far apart axially as possible with the installation of the two bushes, however, this is only possible to a limited extent due to the structural peripheral conditions of the bearing housing

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