Webbing Spool Locking Control for Easier Sensor Lever Return
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Solution Overview
Problem
In webbing winding devices, the displacement member, such as a locking pawl, often faces difficulty in returning to its original position after actuation, leading to hindered displacement and increased load on the lock mechanism.
Innovation Solution
A webbing winding device is designed with a displacement member that can be displaced between two positions, where the actuation portion attracts a part of the displacement member to lock the spool's rotation. A controller adjusts the attracting force after displacement, reducing it to prevent hindrance of the displacement member's return to its original position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuation portion maintains a strong attracting force after displacement, then the displacement member is securely held in the locked position, but the displacement member becomes difficult to return to the original position
Solution Approach 1:
The solenoid is controlled to operate in periodic cycles: activated during emergency to lock the spool, then deactivated after a predetermined time to allow return. This periodic on-off action resolves the contradiction by providing strong attracting force only when needed for locking, while allowing easy return when the solenoid is inactive.
Solution Approach 2:
The attracting force is made dynamic rather than static - it changes over time based on the emergency condition duration. The solenoid transitions from an active state (providing strong attracting force) to an inactive state (allowing easy return), enabling the system to adapt its locking characteristics to different operational phases.
2Reliability
If the solenoid remains activated continuously, then the displacement member stays in the locked position ensuring safety, but energy consumption increases and the displacement member may become stuck
Solution Approach 1:
The solenoid operates periodically rather than continuously - it is activated during the emergency event to establish the locked position, then deactivated after a predetermined time period. This reduces energy consumption significantly while maintaining locking stability during the critical period when the displacement member needs to remain locked.
Solution Approach 2:
The system uses a return spring to automatically return the displacement member to its original position when the solenoid is deactivated. This self-service mechanism eliminates the need for continuous solenoid activation, allowing the system to maintain reliability through passive mechanical return while minimizing energy consumption.
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 device effectively restricts the drawing-out of webbing during emergencies by locking the spool's rotation, while also preventing the displacement member from being hindered in its return, thus reducing the load on the lock mechanism.
Implementation Method 1
the solenoid being actuated... actuation of the actuation portion causing a part of the displacement member to be attracted
Implementation Method 2
a controller configured to adjust an attracting force by which the actuation portion attracts the part of the displacement member
Data Source
AI summary
A webbing winding device includes a spool, a sensor lever, a solenoid, and a controller. In a state where the sensor lever is disposed at the first position, the rotation in the drawing-out direction of the spool is enabled, and in a state where the sensor lever is disposed at the second position, the rotation in the drawing-out direction of the spool is locked. When the solenoid is actuated, a part of the sensor lever is attracted and the sensor lever is displaced from the first position to the second position. The controller adjusts the attracting force by which the solenoid attracts a part of the sensor lever. The controller adjusts the attracting force after completion of displacement to the second position of the sensor lever to an attracting force weaker than the attracting force F at the time of completion of displacement to the second position.