Work Vehicle Fuel Door Locking System Anti-Pry Design
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Solution Overview
Problem
Conventional locking mechanisms for fuel access doors on work vehicles are susceptible to being pried open and may inadvertently open during operation due to incomplete locking, posing risks of contamination and tampering.
Innovation Solution
A locking system featuring a housing with a pivotally coupled door, a catch, a latch arm, and an actuation member that allows the latch arm to pivot and engage/disengage with the catch, providing secure locking and unlocking mechanisms, with options for indirect or direct actuation from the exterior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional locking mechanism is positioned directly adjacent to one side of the door and configured to simply engage an adjacent portion of the fuel access compartment, then the locking mechanism is simple in structure, but the door becomes very susceptible to being pried open
Solution Approach 1:
The locking mechanism transitions from a simple linear engagement to a multi-dimensional system where the latch arm pivots on a first pivot axis to engage the catch, while the actuation member rotates on a second pivot axis that is separate and non-collinear with the first pivot axis. This dimensional separation creates a mechanical advantage that resists prying forces applied to the door.
Solution Approach 2:
The latch arm serves as an intermediary element between the actuation member and the catch. It translates the rotational motion of the actuation member into the engagement/disengagement motion required to lock or unlock the door, while also providing structural reinforcement against prying attempts.
2Ease of operation
If the locking mechanism relies on the operator moving the mechanism to its locked position when closing the door, then the locking mechanism is easy to operate, but the door may incidentally open during operation if not moved fully back to its locked position
Solution Approach 1:
The locking mechanism incorporates a self-latching feature where the latch arm is biased to automatically engage with the catch when the door is closed, without requiring the operator to manually move it to a locked position. The actuation member simply needs to be moved to the unlocked position, and the door will automatically secure itself upon closing.
Solution Approach 2:
The latch arm is pre-configured with a geometry and biasing mechanism that creates a self-latching action, preventing the door from opening incidentally during operation. The design inherently counteracts the tendency of the door to remain unlatched by providing automatic engagement forces.
Data Source
AI summary
A locking system for a fuel compartment assembly of a work vehicle, the locking system having a housing at least partially defining a fuel access compartment, a door pivotally coupled to the housing and movable between an opened position, at which the door provides access to the fuel access compartment, and a closed position, at which the door blocks access to the fuel access compartment, and a locking assembly configured to lock the door at the closed position. The locking assembly includes a catch fixed to the housing and positioned within the fuel access compartment, and a latch arm pivotably coupled to the door at a pivot point defined between first and second ends of the latch arm, the pivot point defining a first pivot axis, where the latch arm is configured to be pivoted about the first pivot axis to be selectively engaged and disengaged with the catch.