Steering Column Composite Design for Strength and Weight Trade-off
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Solution Overview
Problem
The existing steering column designs face challenges in maintaining strength while keeping the thickness thin, which can lead to deformation under excessive force and increased weight when using iron alloys for enhanced strength.
Innovation Solution
A cylindrical steering column design that combines a main portion made from a light metal alloy with a cylindrical member made from an iron-based alloy, connected by a metal ring, allowing for increased inner diameter and reduced weight, with a manufacturing method involving molten metal casting and machining to ensure strength and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the steering column is made entirely from iron-based alloy to ensure strength, then the strength is improved, but the weight increases excessively
Solution Approach 1:
The steering column uses a composite structure combining light metal alloy (aluminum or magnesium) for the main body with iron-based alloy only where structurally necessary (connecting sections and portions requiring enhanced strength). This allows the column to achieve required strength at critical locations while minimizing overall weight by using lighter materials for the majority of the structure.
2Shape
If the thickness of the steering column is reduced to keep it thin, then the weight is reduced, but the strength decreases and deformation occurs under excessive force
Solution Approach 1:
The steering column employs varying thickness throughout its length, with thicker sections (connecting sections) positioned where high strength is required to prevent deformation under impact loads, and thinner sections in areas where weight reduction is prioritized. This local variation in thickness allows the column to maintain overall thinness while achieving necessary strength at critical locations.
3Ease of operation
If the inner diameter is increased to allow for steering lock apparatus assembly, then the ease of operation is improved, but the strength of the steering column decreases
Solution Approach 1:
The steering column is divided into multiple sections with different inner diameter specifications. The main body portions can have larger inner diameters to accommodate steering lock apparatus, while connecting sections maintain smaller inner diameters to preserve structural strength. This segmentation allows the column to satisfy both operational requirements and strength constraints in different regions.
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
This design maintains the strength of the steering column while keeping the thickness thin, preventing deformation and excessive weight increase, and allows for efficient industrial production with improved processing precision and cost-effectiveness.
Implementation Method 1
a ring (22) made using a metal material that is fitted and fastened inside the inner diameter side of the connecting section between the main portion (18) and the cylindrical member (19)
Implementation Method 2
feeding molten light metal alloy into the die, and forming the main portion (18)
Data Source
AI summary
Construction is achieved that is capable of maintaining overall strength of a cylindrical-shaped steering column, while at the same time making it possible to make the thickness part of the steering column thin. An outer column 10b, which is a column member of a steering column is formed by connecting in the axial direction a main portion 18 made using a light metal alloy with a cylindrical member 19 made of an iron-based alloy. A ring 22 made using a metallic material is fitted and fastened to the inner diameter side of the cylindrical member 19 in the connecting section between the main portion 18 and the cylindrical member 19. The inner diameter of the ring 22 is equal to or greater than the inner diameter of the portion of the main portion 18 that is separated in the axial direction from the connecting section with the cylindrical member 19, and is equal to or less than the inner diameter of the cylindrical member 19.