Centrally-mounted motor rotor shaft bearing assembling machine and method

By designing a mid-drive motor rotor shaft bearing assembly machine, and utilizing the bearing positioning seat and internal support cylinder structure to achieve synchronous press-fitting of three bearings, the problems of low assembly efficiency, difficulty in ensuring coaxiality, and risk of damage of mid-drive motor rotor shaft bearings are solved, thereby improving assembly efficiency and quality consistency.

CN122137185APending Publication Date: 2026-06-02SHENZHEN HONEST MECHATRONIC EQUIP CO LTD
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Patent Information

Application Number
CN202610577153.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-28
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In the existing technology, the bearing assembly efficiency of the rotor shaft of the mid-drive motor is low, coaxiality is difficult to guarantee, automation is low, and there is a risk of bearing damage, resulting in poor assembly quality.

Method used

A mid-mounted motor rotor shaft bearing assembly machine was designed, including a bearing positioning seat, a transverse unit, a pressing bracket, a press, a pressing plate, and a rotor shaft positioning plate. Combined with an internal support cylinder and a partition plate, it achieves synchronous pressing of three bearings. The coaxiality is ensured by using a height adjustment cylinder and a guide structure, and the bearings are protected by rubber partition plates and stainless steel plates.

Benefits of technology

It achieves efficient and precise synchronous pressing of three bearings, ensuring coaxiality and assembly quality, reducing the risk of bearing damage, and improving automation and assembly consistency.

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Abstract

The invention relates to a centrally-mounted motor rotor shaft bearing assembling machine and method. The centrally-mounted motor rotor shaft bearing assembling machine comprises a bearing positioning seat, a transverse moving unit, a press-fitting support, a press, a press-fitting plate and a rotor shaft positioning plate. The bearing positioning seat moves between a material receiving position and a press-fitting position through the transverse moving unit, a step position for containing two bearings is arranged on the bearing positioning seat, and an inner supporting air cylinder with a special partition piece is arranged in the bearing positioning seat. The rotor shaft positioning plate is provided with a positioning jig and an opening, and the height of the rotor shaft positioning plate can be adjusted by a cylinder. The press-fitting plate is driven by a press; during assembly, the two bearings are sequentially placed into the bearing positioning seat firstly, and the two bearings are tensioned and positioned in the radial direction through the partition piece of the inner supporting air cylinder before press fitting; the rotor shaft and the upper bearing are manually arranged on the positioning jig; after height adjustment and centering, the bearing positioning seat is moved to a press-fitting position; the press drives the press-fitting plate to press downwards for press-fitting; semi-automatic, high-coaxiality and damage-free press fitting of the upper bearing, the middle bearing and the lower bearing of the middle motor rotor shaft is achieved, and the assembling efficiency and the quality consistency are remarkably improved.
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