Electric supercharger

Abstract

An electric supercharger comprises a stator assembly (29) inserted into a bearing housing (16) and a seal plate (28) firmly stuck to the compressor side of the stator assembly (29) and partitioning a compressor housing (20) from a motor stator (24). The stator assembly (29) includes the motor stator (24) and an outer sleeve (26) the inner peripheral surface of which is firmly stuck to the outer peripheral surface of the motor stator (24) and which so supports the motor stator (24) as to restrain the rotation of the stator motor (24). The motor stator (24) and the outer sleeve (26) are formed as an integral part so as to constitute the stator assembly (29). The outer sleeve (26) constitutes a liquid-tight water-cooled jacket between itself and a bearing housing. The outer sleeve (26) and the seal plate (28) are axially tightened together between the bearing housing (16) and the compressor housing (20).

Description

technical field [0001] The present invention relates to an electric supercharger with a built-in electric motor. Background technique [0002] The process of supplying the air with increased density by the compressor to the engine is called supercharging, and the device that uses exhaust energy to maintain the driving work of the compressor is called an exhaust turbocharger. [0003] Generally, an exhaust turbocharger is composed of a compressor and a turbine arranged with a bearing unit interposed therebetween. The compressor has a compressor wheel built in, and the turbine has a turbine wheel built in. The compressor impeller and the turbine impeller are connected to each other by the connecting shaft (shaft) supported by the bearing unit, the exhaust gas of the engine is used to rotate the turbine impeller, and the driving force is transmitted to the compressor impeller through the connecting shaft, and the compressor impeller compresses air to boost the engine. [0004...

AI Technical Summary

Problems solved by technology

In addition, since the water cooling jacket 71a is provided in the wall portion of the central housing 71, it is necessary to form the water cooling jacket 71a of the central housing 71 with a casting or the like, resulting in a complicated structure.

And, since the electric motor box 76 is cooled not directly by the water cooling jacket 71a, but the electric motor box 76 is cooled via the wall portion of the central housing 71, the cooling efficiency is poor.

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