Straddled Vehicle Seat Lock Anti-Theft Mechanism
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Solution Overview
Problem
Existing straddled vehicle seat lock mechanisms are vulnerable to unauthorized operation, and existing solutions to prevent theft either increase the vehicle's weight and cost or require complex modifications.
Innovation Solution
A straddled vehicle with a seat lock mechanism that includes a key cylinder with a pivotable arm and a hook member with a pivoting restriction portion, preventing the hook member from pivoting without a key being used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guard body or extending portion is added to cover the seat lock mechanism, then theft prevention is improved, but vehicle weight and cost increase
Solution Approach 1:
The seat lock mechanism is segmented into functional components: the hook member with first and second hook portions, the key cylinder with arm, and the pivoting restriction portion. This segmentation allows the anti-theft function to be integrated into the existing lock structure without adding separate guard bodies or covers, thereby preventing weight and cost increases while maintaining theft prevention capability.
Solution Approach 2:
The pivoting restriction portion is merged with the hook member structure, combining the locking function and the anti-theft protection function into a single integrated component. This eliminates the need for separate protective covers or guard bodies, resolving the contradiction between theft prevention and weight/cost increase.
2Reliability
If a guard body or extending portion is added to cover the seat lock mechanism, then theft prevention is improved, but manufacturing cost increases
Solution Approach 1:
The lock mechanism is divided into modular components that can be manufactured separately and assembled, with the pivoting restriction portion being a simple structural feature of the hook member rather than a separate protective component. This reduces manufacturing complexity and cost compared to adding separate guard bodies.
Solution Approach 2:
By merging the protective function into the existing hook member structure through the pivoting restriction portion, the patent eliminates the need for additional parts, reducing manufacturing steps, assembly complexity, and overall production cost while maintaining theft prevention capability.
3Reliability
If the seat lock mechanism is made more secure against unauthorized operation, then reliability is improved, but device complexity increases
Solution Approach 1:
The security function is achieved through segmentation of the hook member into distinct portions (first hook portion for normal operation, second hook portion for locking) with a pivoting restriction portion that selectively prevents unauthorized pivoting. This segmented approach provides enhanced security without requiring complex additional mechanisms.
Solution Approach 2:
The pivoting restriction portion changes the pivoting parameter of the hook member by providing selective restriction: it allows pivoting when the arm is pivotable (authorized operation) but restricts pivoting when the arm is not pivotable (unauthorized operation). This parameter-based control achieves security without increasing device complexity.
Data Source
AI summary
A straddled vehicle includes a vehicle frame, a main seat, a tandem seat, an accommodation portion provided below the tandem seat, a seat lock mechanism attached to a bottom portion of the tandem seat, and a lock portion attached to the vehicle frame in a front portion of the accommodation portion. The seat lock mechanism includes: a key cylinder that has a main body having a key insertion hole, and an arm pivotable around the main body by a pivoting operation made by a key; and a hook member pivotable along with the pivoting of the arm. The hook member includes a first hook portion engageable with the arm, at least one second hook portion engageable with the lock portion, and a pivoting restriction portion configured to restrict the hook member from pivoting in a state where the key insertion hole does not have the key inserted therein.