Exhaust Flap Shaft Coupling With Prestress and Thermal Isolation

The coupling element acts as an intermediary component between the drive shaft and pivot shaft. It provides mechanical coupling and positioning stability while minimizing direct thermal contact. The coupling element's design allows it to transmit mechanical forces and maintain shaft alignment without creating a direct thermal bridge, thus resolving the contradiction between mechanical strength and heat transfer prevention.

The preassembly-blocking devices are incorporated into the coupling device to maintain precise positioning of the drive shaft and pivot shaft during the assembly process. These blocking devices prevent premature movement or misalignment of the shafts, ensuring that the coupling elements engage correctly. Once assembly is complete, the blocking devices can be removed or disengaged, providing both positioning precision during assembly and simplicity in the final structure.

The prestressing mechanism is designed to be integrated into the coupling device structure, where the prestressing element (such as a spring or pre-tensioned component) is incorporated in a way that maintains reliability without significantly increasing complexity. The prestressing force is applied through the coupling element to ensure firm engagement between the drive shaft and pivot shaft, while the design allows for straightforward assembly and maintenance.

The coupling device employs local quality differentiation where different portions of the coupling element have different properties. The regions in contact with the shafts are designed for optimal mechanical strength and positioning, while the overall structure minimizes thermal conduction paths. This localized optimization allows the coupling element to provide strong mechanical coupling while maintaining thermal uncoupling between the drive shaft and pivot shaft.