Drive Mechanism Pin Positioning for Gear Alignment

The patent uses a composite structure combining sheet metal parts and resin members. The sheet metal part provides dimensional accuracy for gear alignment, while the resin member covers the driving part and shaft to contain grease. This composite approach resolves the contradiction by leveraging the strengths of both materials: metal for precision and resin for grease containment.

The patent employs a composite structure where the resin member provides grease containment while the sheet metal part maintains dimensional accuracy. The sheet metal component serves as a rigid framework that prevents deformation and axial inclination, while the resin member acts as a protective cover that contains grease. This division of functional responsibilities resolves the contradiction between grease containment and precision maintenance.

The patent introduces positioning parts as intermediary elements that facilitate precise positioning of pin members during assembly. These positioning parts act as guides or locators that ensure correct alignment without complicating the overall assembly process. By providing this intermediate positioning mechanism, the patent achieves both easy assembly and precise gear alignment, eliminating noise while maintaining manufacturing simplicity.