Drive assembly for an automotive rotating electric machine

JP2023055928A5Inactive Publication Date: 2026-05-27VALEO EQUIP ELECTRIC MOTEUR
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Patent Information

Application Number
JP2023017523
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2017-06-28
Filing Date
2023-02-08
Publication Date
2026-05-27
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing securing means for pulleys on shafts in alternators are prone to loosening under high torque, leading to inadequate retention and potential disengagement during operation.

Method used

A connecting piece, such as a pulley or pinion, is integrally mounted on the shaft with knurling to ensure centered and rotatable locking, using a force-fitted design that includes a knurled portion with a larger diameter than the bore, enhancing retention and alignment with the shaft.

Benefits of technology

The knurling and force-fitted design securely locks the pulley or pinion to the shaft, preventing loosening and ensuring balanced rotation, thereby maintaining effective torque transmission.

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Abstract

To improve the retention of a connecting part integrally mounted on a shaft so as to be rotatable and translatable. [Solution] The drive assembly comprises a rotor shaft (2) extending along a longitudinal axis (X) and a connecting piece providing a connection between the shaft and a torque transmission system (4), the torque transmission system (4) comprising a bore (41) for the passage of the rotor shaft, the bore having a first wall (41a) and a cylindrical second wall (41b) extending axially in alignment with the first wall, the rotor shaft having a first surface (21) extending axially that cooperates with the first wall of the bore to center the connecting piece around the rotor shaft, and a cylindrical second surface (22) extending axially and provided with a knurled portion, the knurled portion having a diameter (A) larger than the diameter (A') of the second wall of the bore, and the connecting piece being press-fitted onto the rotor shaft using the knurled portion.
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