Vehicle Door Check Arm Water Flow Restriction
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Solution Overview
Problem
Vehicle door systems face challenges in managing water flow, particularly in preventing water from entering the vehicle through the gap between the door and the body, which can lead to water accumulation and trapping between the inner and outer door seals, causing issues with drainage and potential damage.
Innovation Solution
A vehicle door system incorporating a check arm with flow restriction means, such as narrow ridges or a recessed groove, that restricts water flow along the check arm and directs it into the door cavity, where it can be drained through strategically placed holes, preventing water from entering the gap between the door and the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water is allowed to flow along the check arm towards the aperture, then drainage is facilitated, but water enters the gap between the door and vehicle body causing accumulation and damage
Solution Approach 1:
The check arm is designed with different surface characteristics at different locations. The flow restriction means (ridges or grooves) creates localized regions that redirect water flow, while other portions maintain smooth surfaces for normal drainage. This local modification of surface quality prevents water from entering the gap between the door and vehicle body while allowing drainage in controlled areas.
Solution Approach 2:
The flow restriction means acts as an intermediary element on the check arm that intercepts and redirects water flow. Instead of water directly entering the gap between the door and vehicle body, the ridges or grooves serve as a mediating structure that channels water into the door cavity through the aperture, preventing harmful accumulation while maintaining drainage function.
2Productivity
If the check arm allows free water flow, then drainage efficiency is improved, but water traps between inner and outer door seals
Solution Approach 1:
The flow restriction means creates localized flow control zones on the check arm. The ridges or grooves are positioned specifically to redirect water away from areas where it would trap between the inner and outer door seals, while maintaining open pathways for efficient drainage into the door cavity. This selective local modification optimizes both drainage efficiency and prevents water trapping.
3Reliability
If flow restriction means is added to the check arm, then water entry is prevented, but device complexity increases
Solution Approach 1:
Instead of redesigning the entire check arm structure, the invention applies flow restriction means (ridges or grooves) as localized features on the existing check arm surface. This minimal modification approach maintains the original simple check arm structure while adding only the necessary local features to control water flow, thereby preventing water entry without significantly increasing device 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
Effectively prevents water from flowing into the gap between the door and the vehicle body, ensuring that water is diverted and drained within the door cavity, thereby avoiding accumulation on the door sill and maintaining the integrity of the door seals.
Implementation Method 1
The ridges extend across the full width of the check arm 42 and are spaced from the pivot axis of the mounting 48 by a distance which is greater than the distance between that pivot axis and the end wall 28 when the door is closed, and less than the distance between that pivot axis and the check arm housing 40 when the door is closed
Data Source
AI summary
A vehicle door system comprises: a door (16) formed from a plurality of panels (18, 20) which define a door cavity (22), one of the panels (20) having an aperture (44) therein at a hinged end of the door; and a check mechanism. The check mechanism comprises a check arm housing (40) mounted within the door cavity (22) and a check arm (42) connected to the vehicle body and extending through the aperture (44) and through the check arm housing (40). The check arm (42) is movable through the check arm housing (40) to allow opening and closing of the door (16). The check arm (42) has a flow restrictor formed on it arranged to restrict the flow of water along the check arm through the aperture.