Seat Belt Retractor Detent Assembly for Tool-Free Mounting
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Solution Overview
Problem
Existing belt retractor devices for vehicles require additional tools to fasten device components such as belt tensioners, gear units, and electronic control units, making the mounting process cumbersome.
Innovation Solution
A belt retractor device equipped with a detent mechanism featuring a first detent element with multiple stops and a second detent element with a detent edge, allowing for easy mounting of device components without the need for tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws and rivets are used to fasten device components, then the connection strength is improved, but the ease of operation deteriorates due to requiring additional tools
Solution Approach 1:
The fastening system is segmented into a detent element with multiple stops and a detent edge, allowing tool-free engagement. The stops are radially offset to provide multiple engagement positions, enabling easy mounting while maintaining secure connection.
Solution Approach 2:
The detent mechanism is designed to be self-servicing during assembly. The detent edge automatically engages with one of the stops when components are moved toward each other in the mounting direction, eliminating the need for external tools or complex fastening procedures.
2Ease of operation
If a detent mechanism with multiple stops is used, then the ease of operation is improved for tool-free mounting, but the device complexity increases
Solution Approach 1:
The detent element with multiple stops serves multiple functions: it provides tool-free engagement, allows adjustment to different engagement positions, and ensures secure connection. This multi-functionality reduces the need for separate adjustment mechanisms, ultimately simplifying the overall device.
Solution Approach 2:
The stops are arranged in the radial direction around the mounting axis, adding a radial dimension to the engagement mechanism. This radial arrangement allows multiple engagement positions without increasing axial length, managing complexity through spatial optimization.
3Adaptability or versatility
If the detent edge engages with offset stops, then the play between components can be adapted, but the manufacturing precision requirements increase
Solution Approach 1:
The radial offset of the stops provides discrete adjustment positions that allow adaptation of the play between components. By changing the radial position where the detent edge engages, different play values are achieved, providing adaptability without requiring continuous adjustment mechanisms.
Data Source
AI summary
A belt retractor device for a vehicle comprises a first device component (12), a second device component (14) and a detent mechanism (16) including a first detent element (26) and a second detent element (28). The first detent element (26) has at least two stops (58) which are offset from each other in the radial direction and in the axial direction relative to a mounting axis (20). The second detent element (28) includes a detent edge (40) configured to engage in one of the stops (58) of the first detent element (12) and to prevent the first device component (12) and the second device component (14) from moving relative to each other against the mounting direction of the mounting axis (20).