Injection-Molded Rotor Key Structure for Gap-Free Magnet Retention

A metal key is introduced as an intermediary component between the silicon steel sheet laminated structure and the rotating shaft. The metal key fits into a keyway on the shaft and engages with the silicon steel sheets, distributing the connection forces and eliminating the need for excessive interference fit that causes deformation. This mediator allows strong connection while maintaining manufacturing precision of the silicon steel sheets.

The connection system uses a composite structure combining the metal key with the silicon steel sheet laminated structure. The metal key provides easy assembly through keyway engagement, while the distributed connection across multiple silicon steel sheets and the interference fit portion of the shaft provide enhanced reliability under high torque conditions.

The harmful element (magnet glue) is extracted and removed from the system. Instead of using magnet glue that can overflow and cause cooling oil leakage, the patent uses an interference fit structure where the silicon steel sheets are directly fitted to the rotating shaft with precise dimensional control, eliminating the need for adhesive materials that could cause leakage problems.

The connection structure is segmented into multiple components: the rotating shaft with keyway, the metal key, and the silicon steel sheet laminated structure. This segmentation allows the connection strength to be achieved through the combined action of the key engagement and the interference fit, rather than relying solely on large interference that would deform the silicon steel sheets and cause residual stress.