Webbing Winding Device Pretensioner Mounting Mechanism
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Solution Overview
Problem
Existing webbing winding devices face challenges in easily mounting a holding member for a pretensioner to a frame, requiring complex screwing mechanisms and lacking stability during mounting and operation.
Innovation Solution
A webbing winding device design featuring a holding member with U-shaped leg portions that engage with hole portions on the frame, allowing for simple mounting and stabilization of the pretensioner, with claw portions and load receiving portions to prevent displacement and falling, and a spool connected to a base end of the webbing belt for efficient winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixing tool is screwed to the frame at two points via the cylinder, then the pretensioner can be fixed to the frame, but the mounting process becomes complex and time-consuming
Solution Approach 1:
The invention extracts the screwing operation from the mounting process by designing a holding member with leg portions that engage with hole portions through insertion only. This eliminates the need for screws and screwing operations, significantly simplifying the mounting process while maintaining reliable fixation of the pretensioner to the frame.
Solution Approach 2:
The holding member's leg portions are designed to be inserted into the hole portions and automatically held in place by the pretensioner's cylindrical body acting as a stopper. The system serves itself by using the pretensioner's own structure to prevent removal of the holding member, eliminating the need for additional fastening components.
2Ease of operation
If the holding member is mounted from the side opposite to the wall portion, then the mounting process is simplified, but the pretensioner may be unstable during operation
Solution Approach 1:
The invention applies preliminary anti-action by designing the leg portions to be inserted from the side opposite to the wall portion (easy insertion direction) while simultaneously incorporating the pretensioner's cylindrical body as a stopper that prevents removal. This pre-established anti-removal mechanism ensures stability during operation while maintaining ease of mounting.
3Strength
If screw fastening is used to secure the holding member, then the pretensioner is firmly fixed, but assembly costs and complexity increase
Solution Approach 1:
The invention extracts screws and screwing operations from the assembly process, replacing them with a simple insertion mechanism where leg portions engage with hole portions. The pretensioner's cylindrical body serves as a built-in stopper, eliminating the need for separate fastening components and reducing assembly costs while maintaining adequate fixing strength.
Solution Approach 2:
The cylindrical body of the pretensioner serves multiple functions: it is both the operational component that winds the webbing belt and simultaneously acts as a stopper to prevent removal of the holding member. This multi-functionality eliminates the need for separate fastening components, reducing part count and assembly complexity.
Data Source
AI summary
Provided is a webbing winding device capable of mounting a holding member for holding a pretensioner on a frame easily. The webbing winding device has a holder which is mounted on a leg plate only by applying loads to tip ends (upper ends) of load receiving pieces and pushing the tip end (bent portion) sides of engagement claws into hole portions. With this structure, the operation of mounting the holder on the leg plate is easy and does not need any component such as screw. As no fastening component such as screw for mounting the holder on the leg plate is required, the cost for components is reduced and as no fastening step of screw is required, such cost is also reduced.