Vehicle Subframe With Segmented Reinforcing Members
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Solution Overview
Problem
Existing vehicle subframes face challenges in achieving high strength and stiffness while maintaining productivity, particularly due to the complexity and weight of reinforcing panels in previous configurations, which can lead to increased costs and difficulties in mass production, especially when applied to vehicles with varying attachment heights.
Innovation Solution
A vehicle subframe design featuring a plate-like structure with projecting portions that form a closed sectional shape, including upper and lower members connected by a front member, with reinforcing members and coupling elements to enhance support stiffness and absorb frontal collisions, while maintaining a simple configuration and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a reinforcing panel is provided extending across multiple attachment portions to increase stiffness, then support stiffness is improved, but the panel becomes large increasing weight and production cost
Solution Approach 1:
The reinforcing panel is divided into multiple separate reinforcing members, each extending between adjacent attachment portions. This segmentation reduces the overall panel size and weight while maintaining stiffness through distributed reinforcement. Each reinforcing member can be independently sized and positioned to provide localized support where needed.
Solution Approach 2:
Reinforcing members are strategically positioned between specific attachment portions based on local stiffness requirements. This allows reinforcement to be concentrated where structurally necessary rather than uniformly distributed, reducing unnecessary material and weight while maintaining overall support stiffness.
2Strength
If a large reinforcing panel is used to increase stiffness, then support stiffness is improved, but production cost increases
Solution Approach 1:
Dividing the reinforcing panel into separate members reduces material requirements and simplifies manufacturing processes. Smaller components are easier to produce, handle, and assemble, reducing production costs while maintaining the necessary structural stiffness through distributed reinforcement.
Solution Approach 2:
Instead of providing full coverage reinforcement across all attachment portions, reinforcing members are placed only where structurally necessary. This partial reinforcement approach achieves adequate stiffness at lower production cost by avoiding excessive material usage.
3Adaptability or versatility
If the subframe is designed for vehicles with large height difference between attachment portions, then adaptability is improved, but draw depth of panels increases inhibiting mass production
Solution Approach 1:
Segmenting the reinforcing structure into multiple smaller members allows each component to be optimized for standard production while the overall assembly accommodates varying vehicle geometries. This modular approach maintains mass production efficiency while providing adaptability to different attachment portion height differences.
Solution Approach 2:
The subframe design allows for adjustable positioning of reinforcing members between attachment portions. This dynamic configuration capability enables the same basic structure to adapt to different vehicle models with varying attachment heights without requiring completely different production tooling, maintaining productivity while improving versatility.
Data Source
AI summary
There is provided a vehicle subframe (1) in which a projecting portion (24, 31) of a front member (20) extends upward, while projecting from a body portion in a width direction, to have an upper end (25, 32), and exhibits a convex shape toward a front side, with the upper end (25, 32) functioning as a front attachment portion to a vehicle body, in such a manner that support stiffness of a suspension can be improved, while ensuring favorable productivity, high strength, and the like, with a simple configuration.