Motor Drive Unit Assembly with Integrated Hook Fastening

The patent integrates the fastening function directly into the heat sink structure by forming hook-shaped protrusions on the heat sink body. This merging of the fastening function into the main component eliminates the need for separate fastening parts like screws, thereby reducing part count and machining costs while maintaining secure connection through the integrated hook structure that engages with corresponding slots in the under-cover.

The patent incorporates fastening protrusions directly into the middle base structure, merging the fastening function with the base component itself. This eliminates the need for separate fastening parts for PCB assemblies, reducing both machining costs and assembly time. The integrated fastening structure allows for quicker assembly operations while maintaining secure connections.

The patent integrates the fan mounting function directly into the heat sink structure by forming hook-shaped protrusions on the heat sink that engage with the fan housing. This eliminates the need for a separate fan cover, reducing part count and costs while maintaining secure fan attachment. The integrated design simplifies the overall structure by combining the heat dissipation and fan mounting functions in one component.

Instead of using traditional rotational screw fastening, the patent inverts the approach by using snap-fit hook structures that engage through simple insertion and elastic deformation. The hook-shaped protrusions on the heat sink engage with slots in the under-cover through a straightforward linear motion, eliminating the need for rotational operations and significantly reducing assembly time while maintaining secure connections through the elastic engagement of the hook structures.