A special fixture and method for loading a middle motor rotor shaft

By designing a multi-positioning structure and a cylinder-driven special fixture for loading the rotor shaft of a mid-mounted motor, the problems of positioning accuracy, anti-magnetic interference, and clamping stability of the rotor shaft of the mid-mounted motor were solved, achieving high-precision coaxiality and stable pressing.

CN122178654APending Publication Date: 2026-06-09SHENZHEN HONEST MECHATRONIC EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN HONEST MECHATRONIC EQUIP CO LTD
Filing Date
2026-05-08
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The existing mid-drive motor rotor shaft has insufficient positioning accuracy, poor anti-magnetic interference capability, and weak clamping stability, which cannot meet the requirements of high coaxiality and high pressure loading force.

Method used

A special clamp for loading the rotor shaft of a mid-mounted motor was designed. It adopts a multi-positioning structure, including a jig plate, an inner support claw, and a positioning claw. Combined with cylinder drive, it realizes multi-point positioning and stable clamping of the rotor shaft, and eliminates magnetic field interference through the positioning rod.

Benefits of technology

It achieves high-precision coaxiality positioning of the rotor shaft in a strong magnetic field environment, ensuring the stability and clamping strength of the pressing process, and improving the versatility and changeover efficiency of the equipment.

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Abstract

This invention relates to a special fixture and method for loading a rotor shaft of a mid-drive motor, comprising a rotor shaft positioning plate, a lifting unit, a rotor shaft clamping plate, and a press. The rotor shaft positioning plate is provided with a fixture plate with a first through groove and a second through groove, and a support plate is driven by a first cylinder to support the rotor shaft from the bottom. The rotor shaft clamping plate is provided with an inner support claw extending into an inner hole and a positioning claw clamping the outer annular groove. The method includes: extending the support plate to receive the rotor shaft; the clamping plate descending, the inner support claw inserting into the inner hole to achieve center alignment; the inner support claw and the positioning claw being driven synchronously by a second cylinder and a third cylinder to perform internal and external coordinated clamping and fixing of the rotor shaft. This invention effectively overcomes magnetic deviation interference in the strong magnetic field environment of a mid-drive motor through multiple constraints of "inner support and outer clamping" and the positioning of the fixture plate shape, solves the problems of low positioning accuracy and easy slippage during high-pressure installation of conventional fixtures, and ensures high coaxiality and stability of rotor shaft press installation.
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