Vehicle Shutter Device Calibration Structure for Foreign Matter Discharge
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Solution Overview
Problem
Existing shutter devices for vehicles face challenges in accurately calibrating the rotational position of the shaft due to foreign matter clogs, which can lead to erroneous learning of the initial position during calibration, especially when air flow alone is insufficient to remove the debris.
Innovation Solution
Incorporating a discharge structure, such as a discharge hole or notch shape, in the frame member and a convex or tapered opposing surface on the calibration member of the shaft to effectively remove foreign matter, ensuring accurate calibration of the rotational position by preventing contact with clogged debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air flow is used to remove foreign matter, then the structure is simple, but the foreign matter removal capability is insufficient when debris is clogged
Solution Approach 1:
The patent divides the foreign matter removal function into two parts: air flow for general cleaning and the discharge structure for removing clogged debris. The discharge structure is segmented into a discharge hole in the frame member and a tapered opposing surface on the calibration member, creating a dedicated pathway for debris evacuation that works alongside the air flow system.
Solution Approach 2:
The discharge structure acts as an intermediary mechanism between the calibration member and frame member contact point. It provides a controlled pathway for foreign matter to be discharged from the calibration area, mediating the interaction between these components and preventing debris from interfering with the calibration process.
2Device complexity
If foreign matter is not discharged, then the structure remains simple, but erroneous learning of initial position occurs during calibration
Solution Approach 1:
The patent extracts the foreign matter discharge function from the overall structure by adding a dedicated discharge hole in the frame member and a tapered opposing surface on the calibration member. This separation allows the calibration function and foreign matter removal function to operate independently, ensuring that debris does not interfere with the precision of the initial position learning process.
3Reliability
If the shaft rotational position is erroneously learned, then the calibration is incorrect, but adding discharge structure increases device complexity
Solution Approach 1:
The discharge structure is implemented with local quality by placing the discharge hole specifically in the frame member at the calibration area and creating a tapered opposing surface on the calibration member. This localized implementation provides targeted foreign matter removal capability exactly where it is needed for calibration, rather than requiring a complex system-wide solution.
Data Source
AI summary
The shutter device has a blade and a frame member which supports the blade in a rotatable manner. The device has a shaft arranged along the frame member, an actuator device for rotating the shaft, and a link member which opens and closes the blade by transmitting a rotational force of the shaft to the blade. The device has a calibration structure having a calibration member formed on the shaft and a calibration surface formed on the frame member. The calibration structure calibrates a rotational position of the shaft by coming into contact with the calibration member onto the calibration surface. The device further has a discharge structure which discharges foreign matters existing between the calibration member of the shaft and the calibration surface of the frame member.