Vehicle Door Latch Protection Wall Design
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Solution Overview
Problem
Conventional vehicle door latch devices have vulnerabilities in antitheft performance due to exposed pivot portions and gaps that allow theft tools to access the operation mechanism, leading to increased weight and size of the metal back member when attempting to enhance security.
Innovation Solution
The design incorporates a protection wall integrated into the synthetic-resin body, which covers the opening to prevent theft tools from accessing the operation mechanism, while maintaining a smaller and lighter structure by eliminating the need for a metal back member with additional protection features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection wall is provided in the metal back member to prevent theft means from accessing the operation mechanism, then antitheft performance is improved, but the back member gets larger and heavier
Solution Approach 1:
The protection function is segmented from the metal back member and transferred to the synthetic-resin body. The protection wall is formed as a separate structural feature within the synthetic-resin body, dividing the protective function from the structural support function performed by the metal back member.
Solution Approach 2:
The protection wall function is extracted from the metal back member and implemented in the synthetic-resin body. This extraction allows the metal back member to maintain its original size and weight while the protective function is relocated to where it is more effectively implemented.
2Reliability
If the outside lever is held in the first casing with covering to improve antitheft performance, then access to the operation mechanism is blocked, but the first casing structure becomes more complex
Solution Approach 1:
The protection wall is merged with the synthetic-resin body as an integrated structure. Rather than adding a separate protective component, the protection wall is formed as part of the existing synthetic-resin body mold, combining the housing and protective functions into a single element.
Solution Approach 2:
The synthetic-resin body serves multiple functions: it houses the engagement mechanism, provides structural support, and implements the protection wall function. This multi-functionality eliminates the need for additional protective components and simplifies the overall structure.
3Stability of the object's composition
If positioning means is provided in the metal back member to connect the engagement unit, then connection stability is improved, but the back member gets larger and heavier
Solution Approach 1:
The positioning function is copied from the metal back member to the synthetic-resin body. The positioning protrusions and grooves are formed in the synthetic-resin body, replicating the connection stability function without requiring additional metal structures.
Data Source
AI summary
A vehicle door latch device which prevents a theft component from getting into an operation-mechanism holding portion thereby improving an anti-theft performance of the vehicle door latch device, by a smaller and lighter arrangement. On a synthetic-resin body, a protection wall is provided that prevents a theft component, inserted in the door, from getting into the casing by covering a connecting part of an outside lever and an operation mechanism, held in the casing, from a vehicle-outside direction.