Synthetic Resin Steering Column Housing with Reinforcing Portions
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Solution Overview
Problem
The existing column housings for vehicle steering systems face a trade-off between ensuring rigidity and reducing weight, with steel providing rigidity but being heavy, and aluminum alloy reducing weight but potentially compromising on rigidity.
Innovation Solution
A column housing made of synthetic resin with elongated slits and reinforcing portions, including a first and second reinforcing portion, to enhance rigidity and support critical areas such as the steering lock device, thereby reducing weight while maintaining required rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the column housing is made of steel to ensure rigidity, then the rigidity requirement is met, but the weight increases
Solution Approach 1:
The patent changes the material parameter from metal (steel or aluminum alloy) to synthetic resin, fundamentally altering the weight-to-strength ratio. The synthetic resin material achieves the required rigidity while significantly reducing the weight of the column housing, directly resolving the contradiction between strength and weight
Solution Approach 2:
The patent employs synthetic resin as a composite material that combines lightweight properties with sufficient structural strength. By selecting appropriate resin formulations and incorporating reinforcing portions strategically, the housing achieves metal-level rigidity with plastic-level weight reduction
2Weight of moving object
If the column housing is made of aluminum alloy to reduce weight, then the weight is reduced, but the rigidity may be compromised
Solution Approach 1:
The patent transitions from aluminum alloy to synthetic resin, changing the fundamental material parameters. The resin material provides a superior strength-to-weight ratio compared to aluminum alloy, achieving both weight reduction and maintained rigidity simultaneously
Solution Approach 2:
The patent incorporates reinforcing portions at specific locations on the column housing where structural strength is most needed. This localized reinforcement approach ensures rigidity is maintained in critical areas while keeping the overall weight low, resolving the contradiction between weight reduction and rigidity maintenance
3Strength
If reinforcing portions are added to the synthetic resin column housing to increase rigidity, then the rigidity requirement is met, but the manufacturing complexity increases
Solution Approach 1:
The patent divides the column housing into distinct functional zones: thin-walled sections for weight reduction and reinforcing portions for strength enhancement. The reinforcing portions are strategically placed only where needed, allowing the majority of the housing to remain simple and easy to manufacture while achieving required rigidity in critical areas
Solution Approach 2:
The reinforcing portions are implemented with localized thickness variations and strategic placement rather than uniform reinforcement throughout. This approach maintains manufacturing simplicity for the majority of the housing structure while providing enhanced rigidity only where structurally necessary
Data Source
AI summary
A column housing for a vehicle steering system is made of synthetic resin and coupled outside a column tube of a steering column for the vehicle system, the column housing including: a slit which is formed to be elongated in a predetermined direction so that the column housing is deformed inward when the column housing is pressed on and fixed to the column tube positioned inside the column housing; and a first reinforcing portion which is formed so as to protrude outward at a predetermined portion from an end position of an end portion of the slit to the periphery of the slit where the slit is not formed, and has a shape having an increased thickness relative to other portions of the column housing.