Seat Belt Retractor Sensing Assembly for Noise Suppression
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Solution Overview
Problem
Current safety belt retractors with vehicle sensing devices generate disturbing noise during normal driving due to frequent collisions of movable parts, which affects the driving experience and requires complex, unreliable, and costly components to suppress noise while maintaining safety performance.
Innovation Solution
A safety belt retractor with an adaptive vehicle sensing assembly that rotates with the seat back adjustment, using a kinematically coupled driven part and suppression part to maintain vehicle sensing function sensitivity and suppress adaptivity noise, featuring a compact structure with static friction or magnetic adhesive force for noise reduction and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vehicle sensing device with steel ball and steel ball seat is used to detect acceleration and trigger locking, then the vehicle sensing function is achieved, but frequent collision between steel ball and steel ball seat during normal driving generates disturbing noise
Solution Approach 1:
The patent extracts the harmful collision interaction between the steel ball and steel ball seat by introducing a suppression part that physically separates or dampens their interaction during normal driving, while preserving the sensing function during emergencies
Solution Approach 2:
The patent introduces a suppression part as an intermediary element between the steel ball and steel ball seat. This suppression part acts as a mediator that prevents direct collision during normal driving, thereby eliminating noise while allowing the sensing function to operate during emergency situations
2Adaptability or versatility
If the adaptive vehicle sensing assembly is allowed to rotate freely to maintain sensing sensitivity during seat back adjustment, then the adaptivity function is achieved, but the assembly may rotate excessively during emergency situations affecting sensing reliability
Solution Approach 1:
The patent applies dynamics by making the suppression part movable rather than fixed. The suppression part can dynamically adjust its position - remaining engaged during normal seat adjustment to allow adaptivity, and disengaging during emergency situations to prevent excessive rotation and maintain sensing reliability
Solution Approach 2:
The patent changes the parameter of the suppression part from a static constraint to a dynamic one that can change its state based on operating conditions. The suppression part transitions between engaged and disengaged states, altering the rotational constraint parameter of the adaptive vehicle sensing assembly according to whether normal operation or emergency conditions exist
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 solution effectively suppresses vehicle sensing noise during normal driving while ensuring the vehicle sensing function remains sensitive and reliable in emergency situations, with a simplified and cost-effective mechanism that maintains the safety performance and adaptivity of the vehicle sensing device.
Implementation Method 1
featuring a compact structure with static friction or magnetic adhesive force for noise reduction
Implementation Method 2
featuring a compact structure with static friction or magnetic adhesive force for noise reduction
Data Source
Figure 1
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AI summary
The present invention relates to a safety belt retractor, including a bracket, a spool, a locking device, a vehicle sensing device with an adaptive vehicle sensing function and a vehicle sensing adaptivity suppression device. The vehicle sensing adaptivity suppression device includes a driven part (8) and a suppression part (7) that can be held on the driven part by an adhesive force. The driven part has a sliding track, and the suppression part has a sliding portion which can slide on the sliding track against the adhesive force. The suppression part has a retainer, and a sensing seat has a counter retainer that cooperates with the retainer. A retaining connection isn't formed when the suppression part is in the first end position, and is formed when the suppression part leaves away from the first end position to a predetermined extent. Here, the mechanism for achieving the vehicle sensing adaptivity suppression function is simple in structure and low in cost, and can effectively suppress the adaptivity of the vehicle sensing function. The present invention further relates to a safety belt assembly comprising such a safety belt assembly.