Internal-Gear Foldable Hinge Structure for Slim Display Clearance

The patent combines multiple hinge components (first rotation part, second rotation part, fixing bracket, and structure) into an integrated assembly where the first and second rotation parts are coupled to the fixing bracket, which is seated on the structure. This merging of components reduces the overall number of separate parts, simplifies the hinge structure, and decreases the weight and bulkiness of the foldable electronic device while maintaining the folding function.

The fixing bracket serves multiple functions: it couples the first rotation part and second rotation part together, provides structural support, and enables the rotation operation. By making the fixing bracket a multi-functional component, the patent reduces the need for additional separate components, thereby simplifying the overall hinge structure and reducing weight.

The patent employs cam structures with curved surfaces (cam surfaces) that interact through contact. The cam structure includes a cam surface that contacts another cam surface, and this curved geometry provides smooth rotational motion and reliable mechanical interaction. The curvature allows for continuous contact and force transmission, ensuring reliable hinge operation despite the simplified structure and reduced weight.

The hinge structure uses dynamic cam surfaces that change their contact points and force vectors during rotation. The cam structure is designed to provide varying mechanical advantage throughout the rotation range, ensuring stable and reliable operation at different angles. This dynamic design allows the simplified hinge to maintain reliability across the entire folding range.

The patent utilizes the radial dimension of the cam structures to provide collision prevention. Instead of requiring additional axial space, the cam surfaces are designed with specific radial profiles that create clearance zones. The curved cam surfaces extend in the radial direction, providing the necessary clearance to prevent display collision while maintaining a slim overall device thickness.

The hinge components are arranged in a nested configuration where the cam structures are positioned within the existing hinge assembly. The cam surfaces are integrated into the rotation parts and fixing bracket, nesting the collision prevention mechanism within the existing structure rather than adding external components. This allows clearance provision without increasing overall thickness.

The patent uses cam structures as intermediary elements that transmit and amplify force between the rotation parts. The cam surfaces act as mechanical levers that provide torque multiplication without requiring traditional gear teeth. The cam structure mediates the force transmission, converting linear cam surface contact into rotational motion with increased torque, thereby achieving the desired power output with a simpler structure than conventional gears.

The patent replaces the traditional gear mechanism with a cam-based mechanical system. Instead of using interlocking gear teeth to transmit torque, the invention uses cam surfaces that contact and push against each other to generate rotational motion and torque. This substitution simplifies the structure by eliminating gear teeth, gear housings, and associated components, reducing both complexity and manufacturing cost while maintaining torque output.