Vehicle Cabin Seal Structure with Drain Grooves
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Solution Overview
Problem
Conventional seal structures for vehicle cabins face issues with water leakage due to weak sealing performance, as the seal members either rely on a single point of contact or weak restoring forces from elastic deformation, which become ineffective over time.
Innovation Solution
A seal structure featuring a seal material with a body portion, seal lips, and drain grooves that contact the cab frame and outer roof, allowing water to drain laterally and preventing stagnation, thereby enhancing sealing performance at multiple points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal member is pressed against the cab frame using tightening force from above, then sealing performance is improved, but the seal member performs sealing action in only one location and becomes ineffective when depleted or force weakens
Solution Approach 1:
The seal material is divided into multiple functional segments: a body portion for structural support, seal lips for primary sealing contact with the cab frame, and drain grooves for water drainage. This segmentation allows the seal to perform multiple functions at different locations, improving reliability without excessive complexity.
Solution Approach 2:
The seal material structure integrates multiple functions: sealing (through seal lips contacting the cab frame), drainage (through drain grooves), and structural support (through the body portion). This multi-functionality ensures continuous protection even when one function becomes less effective over time.
2Reliability
If seal material is elastically deformed to secure sealing performance, then sealing action is achieved, but the restoring force is weak and ineffective when the seal material becomes depleted
Solution Approach 1:
The seal material has different local properties: the body portion provides structural rigidity, the seal lips provide elastic deformation for sealing contact, and the drain grooves provide drainage pathways. This local differentiation optimizes each region for its specific function, with the seal lips specifically designed to contact the cab frame at multiple points.
Solution Approach 2:
The sealing approach transitions from single-point sealing to multi-point sealing along the perimeter. The seal lips extend around the cab frame, creating continuous sealing contact at multiple locations rather than relying on a single sealing point, thereby improving reliability without depending solely on weak restoring forces.
3Object-affected harmful factors
If water enters between the seal material and cab frame, then water can stagnate and leak into the cab, but drain grooves are needed to drain water smoothly
Solution Approach 1:
The harmful water that enters between the seal material and cab frame is extracted and redirected through the drain grooves away from the cabin interior. This extraction principle prevents water stagnation and eliminates the harmful effect of water leakage without requiring complex active drainage systems.
Solution Approach 2:
The drain grooves act as an intermediary structure between the seal material and the cabin interior. They provide a controlled pathway for water to exit the sealing interface, preventing direct contact between leaked water and the cabin interior while maintaining the integrity of the sealing system.
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
The improved seal structure effectively prevents water from entering the cabin by ensuring continuous sealing contact and efficient water drainage, enhancing the overall sealing performance between the outer roof and cab frame.
Implementation Method 1
the seal material is elastically deformed, and a restoring force of the elastic deformation is used to secure sealing performance between the top board and cab frame
Data Source
AI summary
A cab includes a cab frame forming the cab, an outer roof configured to cover the cab frame from above and to be fastened to the cab frame from above, a seal mount protruding downwardly from an edge of the outer roof, and a seal material including a body portion having a recess for receiving the seal mount. The periphery of the body portion of the seal material has a seal lip for contacting the cab frame for sealing, and a drain groove for draining water entering between the seal material and the cab frame.