Threaded Frame Joint Structure for Torsional Strength
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Solution Overview
Problem
The existing frame joint structures in vehicles are prone to fracture due to fatigue, impact, and torsional loads, leading to separation of conjoining portions, especially when welding or bolting is used on the outside of members, compromising the connection robustness and structural integrity.
Innovation Solution
A frame joint structure featuring body members with threaded portions on opposite ends and joints with corresponding female threads, allowing for screw engagement in opposite directions, providing increased conjoining and torsional strength through entire surface matching, and eliminating the need for external welding or bolting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding or bolting is used to connect frame members, then the connection is initially strong, but fracture due to fatigue, impact, and torsional load may occur causing separation of conjoining portions
Solution Approach 1:
The frame members are segmented with threaded portions at their ends, allowing connection through screw engagement rather than continuous welding. This segmentation enables the joint to accommodate stress distribution more effectively, reducing the risk of fracture under fatigue and impact loads while maintaining connection strength.
Solution Approach 2:
The connection method is changed from welding/bolting to thread engagement with extra thread ranges. This parameter change in the connection mechanism provides gradual stress distribution across the threaded portions, enhancing reliability under dynamic loads while maintaining sufficient connection strength through the extended engagement ranges.
2Stability of the object's composition
If welding and adapter welding are applied to secure member connections, then connection robustness is improved, but the risk of fracture and separation under fatigue and impact increases
Solution Approach 1:
Instead of using welding to create a rigid permanent joint, the invention inverts the approach by using threaded screw engagement that allows for controlled movement and stress distribution. This inverted connection method maintains composition stability while reducing the harmful effects of rigid welding under fatigue and impact conditions.
3Strength
If external welding or bolting is used for member connection, then structural integrity is maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The threaded portions are integrated directly into the frame members themselves, merging the connection function into the member structure. This eliminates the need for separate welding or bolting operations and auxiliary materials, reducing manufacturing complexity while maintaining structural integrity through the built-in thread engagement mechanism.
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 proposed solution enhances the conjoining and torsional strength of the space frame, preventing fractures and separations, while reducing manufacturing costs and time by eliminating the need for auxiliary materials and welding equipment.
Implementation Method 1
a plurality of body members having threads formed in different directions on outer surfaces of both end portions, and a plurality of joints each having a plurality of member conjoining portions that are screw-engageable with corresponding body members
Data Source
AI summary
An embodiment frame joint structure includes a plurality of body members, each body member having opposing first and second end portions, wherein threads are formed on outer surfaces of both end portions, the threads being formed in different directions on the first end portions relative to the second end portions, and a plurality of joints, each joint having a plurality of member conjoining portions that are engageable with corresponding body members.