Vehicular Resin Back Door Corner Joint Design
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Solution Overview
Problem
The existing vehicular resin back door structures lack sufficient torsional rigidity and waterproofness at corner portions, particularly between the side and front or bottom portions.
Innovation Solution
The vehicular resin back door design includes overlapping and joining of outer panels with inner panels at corner portions, forming joint portions that enhance torsional rigidity and incorporate curved and aligned end surfaces to improve waterproofness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional resin back door structure is used, then manufacturing is simple, but torsional rigidity at corner portions is insufficient
Solution Approach 1:
The outer panel is divided into front portion outer panel and side portion outer panel that are overlaid and joined at corner portions, merging multiple panels to enhance torsional rigidity without adding separate reinforcement structures
Solution Approach 2:
The front portion outer panel extends in vehicle width direction while side portion outer panel extends in vehicle body front-rear direction, creating overlapping joint portions at corner portions that provide structural strength in multiple dimensions
2Reliability
If conventional back door structure is used, then structure is simple, but waterproofness at corner portions is insufficient
Solution Approach 1:
The front portion outer panel and side portion outer panel are overlaid and joined to form integrated joint portions at corner portions, creating continuous waterproof sealing without additional waterproofing components
Solution Approach 2:
Both front portion outer panel and side portion outer panel are made of resin material matching the inner panel, ensuring homogeneous material properties and consistent waterproof performance across all joint portions
Data Source
AI summary
A vehicular resin back door includes: an inner panel made of resin, the inner panel including: a front edge portion that extends in a vehicle width direction, and right and left edge portions that extend in a vehicle body front-rear direction, the front, right and left edge portions configuring an opening. The vehicular resin back door also includes: (i) a front portion outer panel that extends in the vehicle width direction and is attached to the front edge portion to form a first chamber; (ii) right and left side portion outer panels that extend in the vehicle body front-rear direction and are respectively attached to the right and left edge portions to form second chambers; and (iii) front joint portions at which vehicle width direction outside end portions of the front portion outer panel and front end portions of the side portion outer panels overlap and are joined together.