Vehicle Door Sash Retainer Drainage Design
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Solution Overview
Problem
Existing vehicle door structures face issues with moisture accumulation between the sash outer and inner panels, leading to rust and subsequent moisture leakage onto the vehicle's external appearance surface, as there is no secure discharge path for moisture entering between these panels.
Innovation Solution
A vehicle door structure featuring a sash retainer that extends in the vehicle upper-lower and width directions, fixed to the door sash part, with a paint sealer applied around its periphery to close the gap between the sash retainer and the door sash part, and equipped with drain holes to direct liquid away from the external appearance surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sash outer and sash inner are joined to form a hollow portion, then the structural integrity and sealing capability are improved, but moisture accumulates inside the hollow portion leading to rust generation
Solution Approach 1:
The sash structure is divided into multiple regions: an upper hollow portion for structural integrity and a lower draining portion with drain holes for moisture discharge. This segmentation allows the structure to simultaneously maintain strength while preventing moisture accumulation.
Solution Approach 2:
The harmful moisture accumulation function is extracted from the upper hollow portion by providing a separate lower draining portion with drain holes that communicate with the exterior, allowing moisture to be removed from the closed space.
2Object-affected harmful factors
If drain holes are provided on the sash outer, then moisture discharge capability is improved, but rust water may leak out and stain the external appearance surface
Solution Approach 1:
A sash retainer is introduced as an intermediary component between the sash outer and door sash part. The retainer creates a controlled drainage path through its groove structure, mediating the flow of moisture from the hollow portion to the exterior while preventing direct leakage that would cause staining.
Solution Approach 2:
The drainage function is moved from the horizontal surface of the sash outer to the vertical lower end portion of the sash structure. Drain holes are provided on the lower end in the vehicle width direction, changing the drainage dimension from horizontal to vertical to prevent staining of the external appearance surface.
3Reliability
If a communication passage is provided to discharge moisture, then rust suppression is improved, but the structural sealing capability is compromised
Solution Approach 1:
Different regions of the sash structure have different qualities: the upper hollow portion maintains a closed, sealed structure for structural integrity, while the lower draining portion has drain holes for moisture discharge. This local differentiation allows simultaneous achievement of sealing and drainage functions.
Solution Approach 2:
The sash is segmented into an upper closed hollow portion and a lower draining portion with communication to the exterior. This segmentation allows the structure to maintain sealing capability in the upper portion while providing controlled moisture discharge paths in the lower portion.
Data Source
AI summary
A vehicle door structure includes a door sash part and a sash retainer. A paint sealer is applied to a periphery of a vehicle lower side of the sash retainer continuously without a gap from an inner side to an outer side in a vehicle width direction through a vehicle lower portion so as to close a space between the sash retainer and the door sash part. The door sash part has a region that is lower than an application upper end of the paint sealer, that has both sides in the vehicle width direction and a vehicle lower side that are surrounded by the paint sealer, that is disposed in surface-to-surface contact with the sash retainer. A drain hole configured to drain liquid is provided on the region.