Belt RetraCTOR With Single Lever Cutoff Mechanism
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Solution Overview
Problem
Existing self-locking belt retractors for motor vehicles have complex structures and high construction costs due to separate levers for switching off vehicle-sensitive and webbing-sensitive control systems, which can lead to fault dependencies and unwanted blocking mechanisms.
Innovation Solution
A cap-mounted catch lever with a counter transmission mechanism that simultaneously switches off both control systems by immobilizing the inertia mass and sensor lever, simplifying the design and eliminating the need for multiple components and actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate levers are provided for switching off vehicle-sensitive and webbing-sensitive control systems, then the control systems can be switched off independently, but the structure becomes complicated and construction costs increase
Solution Approach 1:
The patent combines the vehicle-sensitive control system and webbing-sensitive control system into a single integrated control mechanism. The sensor lever is designed to engage with both the cam disc (for vehicle-sensitive control) and the inertia mass (for webbing-sensitive control) simultaneously, eliminating the need for separate levers and reducing structural complexity while maintaining reliable switching of both control systems
Solution Approach 2:
The sensor lever is designed as a multi-functional component that performs multiple switching functions. It can switch off both the vehicle-sensitive control system (via cam disc engagement) and the webbing-sensitive control system (via inertia mass engagement) with a single component, thereby reducing the overall number of parts and simplifying the belt retractor structure
2Ease of operation
If multiple control procedures are implemented for switching off control systems, then comprehensive control is achieved, but fault dependencies cannot be ruled out and reliability decreases
Solution Approach 1:
The patent merges the switching operations for both control systems into a single simultaneous action. The sensor lever is positioned and designed such that its engagement with the cam disc and inertia mass occurs concurrently, eliminating sequential dependencies and potential fault chains between multiple switching procedures
3Device complexity
If a single catch lever is used to switch off both control systems simultaneously, then the structure is simplified and costs reduced, but the mechanism must be precisely designed to ensure reliable simultaneous switching
Solution Approach 1:
The sensor lever acts as an intermediary component that translates the retraction force into simultaneous engagement with both the cam disc and inertia mass. Its specific geometric design and positioning ensure that the switching action is distributed appropriately to both control systems at the same time, reducing the precision requirements for individual components while maintaining overall system reliability
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
This solution simplifies the belt retractor design, reduces construction costs, and enhances the reliability of switching off both control systems with a single action, preventing unwanted blocking and improving safety.
Implementation Method 1
an inertia mass (14) mounted on the cam disc (32) in a movable manner and controllable in a blocking position for the cam disc (32) by means of inertial forces
Implementation Method 2
A counter transmission mechanism that simultaneously switches off both control systems
Data Source
AI summary
A self-locking belt retractor in particular for motor vehicles with a vehicle-sensitive and a webbing-sensitive control system for the blocking device of the belt retractor having an operatable toothed lock washer in a cased gearing.