Variable Air Intake Valve Frame Labyrinth Sealing

The communication passage structure is segmented into multiple components: the valve frame, bearing bosses, and partition are formed as separate elements through injection molding, then assembled together. This segmentation allows each component to be manufactured independently with standard molding processes rather than requiring high-precision mechanical processing of a single integrated structure, thereby reducing manufacturing cost while maintaining air blocking performance through proper assembly design.

An intermediary sealing structure is introduced between the valve frame and bearing bosses to ensure air-tightness. The sealing elements act as mediators that compensate for minor dimensional variations in the molded parts, achieving reliable air blocking without requiring extremely tight manufacturing tolerances on the individual components themselves.

Multiple functions are merged into the injection-molded valve frame structure: the frame itself serves as both a structural support and a sealing surface, the bearing bosses are integrated directly into the frame, and the partition is formed as part of the same molded structure. This merging reduces the total number of separate parts and assembly steps while maintaining effective air blocking through the inherent geometry of the molded features.

The design transitions from requiring high-precision mechanical processing to utilizing injection molding parameters to achieve the necessary dimensional accuracy and surface quality. By optimizing molding parameters such as injection pressure, temperature, and cooling time, the required air blocking performance is achieved through the molding process itself rather than subsequent precision machining.