Rotor bearing support structure and supercharger

Abstract

The present invention provides a rotor bearing support structure and supercharger. The half-floating liner sleeve comprises a first bearing part, a middle liner sleeve part and a second bearing part. The end edge (39ai) at the inner circumferential face of the first bearing part is arranged more closely to the impellers (7) of a compressor than the end edge (39ao) at the outer circumferential face; the end edge (39bi) at the inner circumferential face of the second bearing part is arranged more closely to the impellers of a turbinate than the end edge (39bo) at the outer circumferential face of the second bearing part. The outer circumferential face of the middle sleeve except the part adjacent to one side of the first bearing part is provided with an oil container. The lower part of the middle liner sleeve is provided with oil discharging holes. The lower side of the half floating liner sleeve of the support base is provided with oil discharging channels.

Description

technical field [0001] The present invention relates to a rotor shaft support structure of a supercharger mounted on a vehicle or the like, and a supercharger provided with the rotor shaft support structure. Background technique [0002] Generally, a vehicle supercharger includes a bearing housing, and a rotor shaft that is rotatably provided to the bearing housing and integrally couples a compressor impeller and a turbine impeller on the same shaft. In addition, from the viewpoint of reducing the noise of a vehicle supercharger, a rotor shaft support structure equipped with a semi-floating bush (semi-floating bearing) is widely used in a vehicle supercharger (see JP-A 2012- 219788 and Japanese Patent Laid-Open No. 2012-193709). [0003] The structure of a typical rotor shaft support structure will be briefly described. The bearing housing has a bearing seat portion on the inner side. An installation hole is formed through the support seat portion along the axial directio...

AI Technical Summary

Problems solved by technology

On the other hand, if the gap between the inner peripheral surface of the installation hole and the outer peripheral surface of the intermediate bushing is uniformly enlarged, when the force generated by the pressure difference between the compressor impeller and the turbine impeller acts on the oil , worrying about causing an oil deflector between the inner peripheral surface of the setting hole and the outer peripheral surface of the second bearing portion, resulting in increased wear between the setting hole and the semi-floating bushing

[0010] In other words, it is not easy to improve the durability of the vehicle supercharger and to reduce the mechanical loss of the rotor shaft support structure to improve the efficiency of the vehicle supercharger.

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