Sealed Seat Belt Web Retractor for Moisture-Resistant Locking
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Solution Overview
Problem
Existing seat belt web retractors are prone to premature wear and improper operation due to moisture, fluids, and dirt ingress, which can compromise their functionality during dynamic events.
Innovation Solution
A sealed web retractor design featuring a frame with sealed openings, a spool shaft supported by a bushing, and gaskets to prevent moisture and contaminants from entering the locking and drive assemblies, ensuring reliable operation under high web loading conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional open design web retractors are used, then the structure is simple and easy to manufacture, but moisture and contaminants can enter the locking and drive assemblies causing premature wear and improper operation
Solution Approach 1:
A gasket is positioned between the housing and the first side wall to seal the opening. The gasket creates a flexible barrier that prevents moisture and contaminants from entering the locking assembly while allowing for thermal expansion and manufacturing tolerances. This resolves the contradiction by providing reliable sealing without requiring a completely redesigned rigid sealed structure.
Solution Approach 2:
The gasket acts as an intermediary element between the external environment and the internal locking assembly. It mediates the interaction by blocking harmful substances (moisture, contaminants) while allowing the retractor to maintain its simple overall structure. This enables reliable operation without significantly increasing device complexity.
2Reliability
If sealed openings with gaskets are added to prevent moisture ingress, then reliability improves, but manufacturing complexity and assembly steps increase
Solution Approach 1:
The retractor is divided into separate segments: the housing, the locking assembly, and the gasket as distinct components. This segmentation allows each component to be manufactured independently using standard processes, then assembled together. The gasket is positioned between the housing and locking assembly, creating a seal without requiring complex integrated sealing structures, thus maintaining ease of manufacture while improving reliability.
3Duration of action of stationary object
If the spool shaft is supported by a bushing in a sealed environment, then wear is reduced and operation is more reliable, but the device complexity increases
Solution Approach 1:
The bushing serves as an intermediary support element between the spool shaft and the housing. It provides a low-friction surface for the spool shaft to rotate on, reducing wear and extending service life. The bushing is positioned within the sealed environment created by the gasket, protecting it from contaminants that would accelerate wear. This extends the duration of action without requiring a completely complex sealed support structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sealed design effectively prevents moisture and contaminants from interfering with the locking and drive mechanisms, maintaining the integrity and functionality of the seat belt system during normal use and dynamic events.
Implementation Method 1
A gasket can be positioned between the housing and the first side wall and around the first opening
Implementation Method 2
the seal together with the gasket can prevent, or at least restrict, moisture, fluids, dirt, and/or other unwanted substances from entering the locking assembly housing
Data Source
AI summary
Web retractors and associated systems and methods for retracting a web, such as a seat belt web, are disclosed herein. In some embodiments, a sealed web retractor includes a frame having a side wall with a first opening, a locking assembly housing attached to the side wall and having a second opening adjacent to the first opening, and a spool shaft having a portion that extends through the first and second openings. In some embodiments, the retractor can further include a bushing and a seal operably disposed in the first opening and extending around an outer periphery of the spool shaft.