Bearing structure of motor-driven supercharger

Abstract

A bearing structure is provided with a turbine side bearing metal (30a) and a compressor side bearing metal (30b) in which an outer peripheral surface is fitted to a bearing hole (16a) of a bearing housing (16) with a gap, and an inner peripheral surface rotatably supports a turbine shaft (12), and a bearing locking member (32) holding the turbine side bearing metal and the compressor side bearing metal so as to be movable in a radial direction of the turbine shaft and inhibit a movement in an axial direction and a rotating direction. The inner peripheral surface and/or the outer peripheral surface of the bearing metal (30b) (or 30b) is structured as a non-complete round bearing.

Description

technical field [0001] The invention relates to an exhaust turbocharger, and more specifically, relates to a bearing structure of an electric supercharger with an electric motor inside. Background technique [0002] Supplying the engine (engine) with air whose density has been increased by the compressor is called supercharging, and the machine that uses the exhaust energy to maintain the driving operation of the compressor is called an exhaust-gas turbocharger. ). [0003] An exhaust turbocharger is generally composed of a compressor and a turbine arranged with a bearing assembly interposed therebetween. The compressor and the turbine respectively have a compressor impeller and a turbine impeller built therein. The compressor impeller and the turbine impeller are connected to each other by the connecting shaft supported on the bearing assembly. The turbine impeller is driven to rotate by the exhaust gas of the engine, and the rotational force is transmitted to the compress...

AI Technical Summary

Problems solved by technology

However, in this case, since the motor is installed outside one bearing, the amount of overhang increases and the load acting on the bearing increases.

[0015] Therefore, in the case of using the conventional full-circle full floating bearing as the bearing, the damping effect of the oil film is insufficient, and self-excited vibrations called lubricating oil foaming or oil swirls occur. As a result, there are vibrations of the shaft and Increased noise, problems with bearing sintering

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