Vehicle Door Latch Open Preventing Lever Mechanism
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Solution Overview
Problem
Existing door latch devices for vehicles fail to prevent doors from opening during abnormal situations like broadside collisions, where the inertial force-based mechanisms are not activated, leading to potential human accidents.
Innovation Solution
A door latch device comprising an inter lever, cable, cable cover, and open preventing lever, where the open preventing lever is removably fixed to the cable cover and can rotate to prevent the inter lever from transitioning to the unlock mode when the cable is damaged or deviated, ensuring the door remains locked during abnormal situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inertial force-based door open preventing device is used, then the door can be prevented from opening during vehicle collisions, but the device fails to operate when inertial force is not acted (normal situations or certain collision types)
Solution Approach 1:
The patent replaces the inertial force-based mechanical system with a magnetic field-based system. The cable cover includes a magnet, and the open preventing lever includes a magnetic sensor that detects the magnet's position. This substitution allows the system to detect cable cover displacement through magnetic field changes rather than relying on inertial force, enabling operation in both normal situations and various collision scenarios.
2Reliability
If the cable cover is fixed to prevent door opening, then door safety is improved, but the device complexity increases
Solution Approach 1:
The patent uses a flexible cable cover that can move along the cable. The cable cover includes a magnet and is removably fixed to the cable. When the cable cover moves due to cable damage or dislocation, the magnetic sensor detects this movement and triggers the door lock. This approach provides effective door protection while maintaining relative structural simplicity through the use of flexible, movable components rather than rigid fixed structures.
3Reliability
If the open preventing lever is always fixed to the cable cover, then the door remains locked during abnormal situations, but the device cannot be removed or reset
Solution Approach 1:
The patent implements a dynamic system where the cable cover is removably fixed to the cable and can move along it. The open preventing lever is rotatably coupled to the cable cover assembly. During normal operation, the system is in a locked state. When cable damage occurs, the cable cover moves, triggering the lock. After incident resolution, the cable cover can be removed and reattached to reset the system, providing both safety during incidents and ease of reset afterward.
Data Source
AI summary
A door latch device for a vehicle may include an inter lever locking or unlocking a door opening and closing a vehicle interior, a cable connected to a door handle disposed on the door; a cable cover surrounding the cable and removably fixed to the cable when the door is shocked; and an open preventing lever configured to be removably fixed to the cable cover, be rotatable when being removed from the cable cover, and have the inter lever which is present within a rotation radius thereof.