Roof Lock Device Regulating Portion Prevents Forward Movement
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Solution Overview
Problem
Existing roof lock devices for vehicles are unreliable in maintaining the locked state during collisions or sudden forces, as the hook member can inadvertently move forward, leading to an unlocked state.
Innovation Solution
A roof lock device with a rotator and link member configuration that includes specific angular positions and a regulating portion to prevent forward movement of the hook member, utilizing a contact position detector to stop the motor when the rotator reaches a certain position, ensuring the hook member remains locked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hook member and link member are positioned rearward to lock the roof member, then the locking reliability is improved, but the vulnerability to forward movement during collision increases
Solution Approach 1:
The patent applies preliminary anti-action by designing the rotator's second angular position to be shifted from the reference angular position in the second rotation direction. This pre-positioning creates a buffer zone that prevents the hook member from moving forward during collision, as the rotator cannot rotate further in the second rotation direction from the second angular position due to the regulating portion.
2Ease of operation
If the rotator is allowed to rotate freely between angular positions, then the ease of operation is improved, but the stability of the locked state deteriorates
Solution Approach 1:
The patent applies parameter changes by defining specific angular positions for the rotator: the first angular position shifted by angle θ1 in the first rotation direction, and the second angular position shifted by angle θ2 in the second rotation direction. These angular parameter constraints ensure the rotator can rotate freely within the allowed range for operation, but cannot exceed the second angular position, thereby maintaining locked state stability.
3Strength
If the hook member is positioned at the rearmost position for locking, then the strength of the lock is improved, but the susceptibility to unintended unlocking increases
Solution Approach 1:
The patent applies preliminary action by pre-positioning the rotator at the second angular position, which is shifted from the reference angular position in the second rotation direction. This preliminary positioning ensures that even if a forward force is applied to the hook member, the rotator cannot rotate further in the second rotation direction, preventing unintended unlocking and maintaining locking strength.
Data Source
AI summary
In a driver, supposing that an angular position of the rotator in a state where a coupler coupling a link member and the rotator together is located at a rearmost position is regarded as a reference angular position, a first angular position is an angular position where the rotator is shifted from the reference angular position in a first rotation direction by an angle θ1, and a second angular position is an angular position where the rotator is shifted from the reference angular position in a second direction opposite to the first rotation direction by an angle θ2 smaller than the angle θ1. The driver has a regulating portion which does not allow the rotator to rotate in the second rotation direction from the second angular position.