Motor unit

CN115149747BActive Publication Date: 2026-05-26NIDEC CORP(JP)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NIDEC CORP(JP)
Filing Date
2022-03-28
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In the prior art, when the helical gear rotates in both directions or is powered, the axial movement causes insufficient contact between the charge removal device and the shaft end face, making it difficult to ensure effective charge release performance.

Method used

A motor unit is designed, which includes an electric discharge device comprising a contact component and a force-applying component. The contact component contacts the end face of the shaft through the force-applying component, and the stroke of the contact component is designed to be greater than the axial movement of the shaft to ensure continuous contact during axial movement.

Benefits of technology

Even during axial movement, the charge removal device can still contact the shaft, ensuring effective release of charge and improving charge removal performance.

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  • Figure CN115149747B_ABST
    Figure CN115149747B_ABST
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Abstract

The motor unit has a shaft and an anti-static device. The shaft includes a helical gear. The anti-static device includes a contact member, a force-applying member, and a housing. The end face of the force-applying member facing the end of the shaft applies force to the contact member in a direction parallel to the axial direction of the shaft. The contact member is conductive. Through the force applied by the force-applying member, the contact member contacts the end face. The maximum axial travel of the contact member is greater than the axial movement of the shaft during rotation.
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