Rotor core and method of fastening rotor core and rotary shaft

A technology of rotor iron core and rotating shaft is applied in the field of fastening between the rotor iron core and the rotating shaft, which can solve the problems such as the deformation of the rotor iron core 1, and achieve the effect of reducing the change of magnetic flux and preventing the deformation in the axial direction.
CN102244429BActive Publication Date: 2014-09-03DENSO CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DENSO CORP
Publication Date
2014-09-03

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Abstract

The invention provides a rotor core and a method of fastening the rotor core and a rotary shaft. The method of fastening the rotor core having no end plate and composed of laminated steel plates, and the rotary shaft by means of thermal insert can prevent the rotor core from being axially deformed due to the thermal insert load. The rotor core (12) is formed by axially laminating a plurality of circular-ring-shaped steel plates having through holes embedded in the shaft (11). A first groove (12a) and a first projecting bar (12b) are alternately formed on circumferential direction of the rotor core (12) inner peripheral surface where the through holes are formed. The first groove (12a) is recessed towards the outer radial direction and axially extends. The first projecting bar (12b) projects towards the inner radial direction and axially extends. A welding part (12b-1) for combining axially adjacent steel plates together is equipped on the projecting end face of the first projecting bar (12b). The welding part (12b-1) is continuously equipped from one axial end to the other axial end.
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Description

technical field

[0001] The present invention relates to a rotor core of an electric motor used as a rotating electrical machine in vehicles such as hybrid vehicles and electric vehicles, and a method of fastening the rotor core and a rotating shaft. Background technique

[0002] Conventionally, as a method of fastening a rotor core and a shaft (rotary shaft) of an electric motor (rotary electrical machine), there is a method described in Patent Document 1, for example. In this method, a collar member made of a material softer than that of the shaft is interposed between the rotor core and a shaft inserted through the center hole of the rotor core, and the tool is pressed against the shaft from the axial direction. The rotor core and the shaft are fastened to each other by deforming the end surface of the collar member. According to this method, when the end surface of the collar member is deformed by the tool, the vicinity of the end surface expands in the radial direction ...

Claims

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