Fueling Nozzle Shutter Mechanism for Diameter-Specific Blocking
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Solution Overview
Problem
Conventional fueling error prevention devices fail to accurately prevent the insertion of small-diameter nozzles while allowing large-diameter nozzles, due to issues with rotational displacement and potential misalignment, leading to incorrect operation and potential blockage of large-diameter nozzles.
Innovation Solution
A device with a shutter member that can slide and rotate, featuring first and second abutting portions to ensure only nozzles with a predetermined diameter or above can move to the permitting position, and includes biasing means and stopper portions to maintain the blocking position securely, preventing small-diameter nozzle insertion and ensuring accurate fueling error prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shutter member rotates only around one axis line to move from blocking position to permitting position, then the device structure is simple, but the small-diameter nozzle may strongly hit the nozzle entrance-shielding portion and cause erroneous rotation to the permitting position
Solution Approach 1:
The shutter member is modified to rotate around two different axis lines sequentially instead of one axis. First, it rotates around a first axis line to an intermediate position, then around a second axis line to the final permitting position. This dimensional change in rotation mechanism prevents the small-diameter nozzle from causing erroneous rotation while still allowing the large-diameter nozzle to operate correctly.
2Reliability
If a projecting portion is added to the nozzle entrance-shielding portion to prevent shutter member rotation by small-diameter nozzle, then fueling error prevention is improved, but the large-diameter nozzle insertion may be blocked
Solution Approach 1:
The shutter member is designed with dynamic rotation capability around two different axis lines. The first rotation around the first axis line moves the shielding portion away from blocking the large-diameter nozzle path, while the second rotation around the second axis line completes the transition to the permitting position. This dynamic two-axis rotation ensures that the projecting portion prevents small-diameter nozzle operation without blocking large-diameter nozzle insertion.
3Device complexity
If the shutter member only rotates around one axis line, then the mechanism is simple, but erroneous operation occurs when the small-diameter nozzle is inserted in a slanted or oblique state
Solution Approach 1:
The shutter member incorporates sequential rotation around two different axis lines. The first rotation around the first axis line handles the initial positioning, and the second rotation around the second axis line handles the final positioning. This two-dimensional rotation sequence ensures that even when the small-diameter nozzle is inserted in a slanted or oblique state, the projecting portion effectively prevents erroneous rotation while the large-diameter nozzle can still be inserted correctly.
Data Source
AI summary
A device for preventing a fueling error reliably prevents a fueling error by accurately preventing an insertion of a small-diameter nozzle without blocking an insertion of a large-diameter nozzle whose entrance should be permitted. Even if an end of a nozzle is strongly pressed to left-and-right shutter members (22), the shutter members (22) never rotate and move in an opening direction unless the shutter members (22) slide and move to an outside of a radial direction. Thus, the structure prevents the shutter members (22) from erroneously moving to a position in which the nozzle is allowed to enter from a blocking position.