Motor Vehicle Door Latch Inertia Blocking Mechanism
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Solution Overview
Problem
Conventional motor vehicle door latches lack effective mechanisms to prevent accidental release during collisions, as existing inertia-based latches may not securely maintain the latched position under impact conditions.
Innovation Solution
A latch system incorporating an inertia lever and a blocking lever that move between positions to secure the opening mechanism in a stable blocking configuration, preventing accidental unlatching during collisions, and allowing controlled release through an inner handle mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inertia lever mechanism is added to prevent accidental release during collisions, then the reliability of the latch is improved, but the device complexity increases
Solution Approach 1:
The blocking lever is integrated within the existing latch mechanism structure, nesting the collision prevention function inside the door latch assembly. The blocking lever works in conjunction with the ratchet and pawl components, utilizing the existing structural space rather than adding a completely separate system.
Solution Approach 2:
The blocking lever acts as an intermediary element between the inertia lever and the opening mechanism. During normal operation, the blocking lever remains passive. During collision, it mediates by preventing the pawl from disengaging the ratchet, thus protecting the latch system without requiring direct control systems.
2Reliability
If a blocking lever is introduced to prevent accidental unlatching, then the safety is improved, but the ease of operation deteriorates
Solution Approach 1:
The blocking lever is designed to be dynamic rather than fixed. It automatically transitions between blocking and non-blocking states based on collision conditions. During normal operation, it allows free movement of the opening mechanism. During collision, it becomes active to prevent accidental release, thus adapting to different operational states.
Solution Approach 2:
The blocking lever operates autonomously based on the physical conditions of collision. It self-activates when inertia forces during collision move it into the blocking position, and self-deactivates when the collision ends and inertia forces subside. This eliminates the need for additional control systems or user intervention.
3Reliability
If the inertia lever is designed to move between positions to block the opening mechanism, then the reliability during impact is improved, but the device complexity increases
Solution Approach 1:
The blocking lever is merged with the existing latch components rather than being a completely separate element. It integrates with the ratchet and pawl assembly, combining the collision prevention function with the existing door latching mechanism. This reduces the need for additional independent components and simplifies the overall structure.
Solution Approach 2:
The blocking lever serves multiple functions: it acts as a collision sensor, a blocking element, and a mechanical indicator of collision status. By making this single component multi-functional, the patent avoids adding separate sensors, indicators, and control systems that would increase complexity.
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 latch system effectively secures the door in a latched position during collisions and allows controlled opening after the event, enhancing safety and reliability by preventing accidental door release.
Implementation Method 1
an inertia lever which is fitted to the supporting body and can move with respect to the supporting body from a first position to a second position
Data Source
AI summary
A latch for a door of a motor vehicle includes a supporting body, a closing assembly adapted to cooperate with a latch striker, and an opening mechanism which can move between a latched configuration and an unlatched configuration. An inertia lever is fitted to the supporting body and is free to oscillate from a first position to a second position. The latch includes a blocking lever movable between a release position and a stable blocking position. The inertia lever and the blocking lever are coupled in such a way that movement of inertia lever from the first position and the second position causes the movement of blocking lever from the release position to the stable blocking position.