Belt Retractor Control Tooth System Integration
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Solution Overview
Problem
In dynamic vehicle-sensitive activation, the coupling disk can twist or deform relative to the tooth system of the belt reel, leading to an unreliable engagement of the blocking teeth with the belt reel's tooth system, resulting in incorrect positioning and engagement under load.
Innovation Solution
A control tooth system is integrated directly into the belt reel, eliminating the need for a coupling disk by using an intermediate lever engaged by the sensor, which is supported on the control lever to ensure precise engagement with the blocking teeth, and a separate disk with lands provides higher accuracy and a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling disk is used to connect the sensor lever to the belt reel, then the belt reel can be locked in a vehicle-sensitive manner, but the coupling disk can twist or deform relative to the tooth system during dynamic operations, resulting in unreliable engagement and incorrect positioning
Solution Approach 1:
The patent removes the coupling disk from the system and directly integrates the control tooth system onto the belt reel flange. This eliminates the intermediate coupling element that caused twisting and deformation, ensuring direct and reliable engagement between the sensor lever and the belt reel tooth system without relative movement or positioning errors.
Solution Approach 2:
The control tooth system is merged directly with the belt reel flange, combining functions that were previously separated. The control tooth system is now an integral part of the belt reel assembly, eliminating the need for a separate coupling disk and ensuring rigid, precise positioning during dynamic operations.
2Reliability
If the control tooth system is integrated directly into the belt reel, then the association between the tooth system and blocking teeth is reliably maintained during dynamic operations, but the structure becomes more complex
Solution Approach 1:
The control tooth system is merged with the belt reel flange as an integral component. This integration maintains reliable association during dynamic operations while avoiding the need for separate coupling disks, sensor levers, and intermediate connection elements, thereby not increasing overall structural complexity.
3Productivity
If the coupling disk is eliminated and the control tooth system is provided directly at the belt reel, then the responsiveness and accuracy of the blocking mechanism is improved, but the manufacturing process becomes more demanding
Solution Approach 1:
The coupling disk is removed from the system, eliminating the source of twisting and deformation. The control tooth system is directly integrated into the belt reel flange, ensuring immediate and accurate response during blocking operations without the delays or errors introduced by intermediate coupling elements.
Solution Approach 2:
The control tooth system is pre-integrated into the belt reel flange during manufacturing, ensuring precise positioning and alignment before the retractor is assembled. This preliminary integration eliminates the need for field adjustments and ensures accurate engagement from the first use.
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 maintains reliable association of the belt reel's tooth system with the blocking teeth during dynamic operations, improving the responsiveness and accuracy of the belt retractor's blocking mechanism, simplifying manufacturing, and reducing susceptibility to damage.
Implementation Method 1
a sensor that actuates when a predetermined vehicle deceleration is exceeded
Implementation Method 2
the control pawl is pivoted outwardly from a home position by exploiting mass inertia forces
Data Source
AI summary
A belt retractor (10) for a vehicle seat belt, includes a frame (12) provided with a plurality of blocking teeth (22), a belt reel (14) being rotatably supported in the frame (12) and a blocking tooth system (24) adapted to be engaged with the blocking teeth (22). A control lever (28) pivoted on the frame (12) and accommodates the belt reel (14). A sensor (34) actuates when a predetermined vehicle deceleration is exceeded. A control tooth system (26) with which the sensor (34) is adapted to interact is provided at the belt reel (14).