Flexible Steering Shaft for Torque Transfer Under Gearbox Movement
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Solution Overview
Problem
Traditional steering shafts are prone to bending or fracturing when the steering gearbox moves relative to the steering wheel or encounters obstructions, leading to loss of steering functionality in vehicles, especially during collisions.
Innovation Solution
A hybrid steering shaft system comprising a rigid shaft coupled with a flexible shaft made of bendable and rotatable material, allowing for adjustable length and continued torque transfer between the steering wheel and gearbox, even when the gearbox moves or obstructions are encountered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid steering shaft is used to transfer torque from steering wheel to gearbox, then structural strength and torque transfer capability are improved, but vulnerability to bending or fracturing during collisions or when gearbox moves relative to steering wheel increases
Solution Approach 1:
The steering shaft is divided into two distinct segments: a rigid shaft portion and a flexible shaft portion. The rigid shaft provides structural strength for torque transfer, while the flexible shaft provides adaptability and collision resistance. This segmentation allows each portion to perform its specialized function, resolving the contradiction between strength and reliability.
Solution Approach 2:
The steering shaft employs a composite structure combining rigid material (for the rigid shaft) and flexible material (for the flexible shaft). This composite approach integrates the advantages of both material types - the rigid material provides strength for torque transfer while the flexible material provides reliability during collisions and relative movement.
2Ease of manufacture
If a rigid steering shaft is used to maintain structural integrity, then manufacturing simplicity is improved, but adaptability to gearbox movement and obstructions deteriorates
Solution Approach 1:
The steering shaft is segmented into rigid and flexible portions, where the rigid shaft maintains manufacturing simplicity while the flexible shaft provides adaptability. This segmentation allows the system to achieve both ease of manufacture (through the rigid portion) and adaptability (through the flexible portion).
Solution Approach 2:
Different portions of the steering shaft have different local qualities - the rigid shaft portion has high structural integrity for easy manufacturing, while the flexible shaft portion has high adaptability for accommodating movement and obstructions. This local differentiation resolves the contradiction between manufacturing simplicity and adaptability.
3Adaptability or versatility
If a flexible shaft is used to adapt to obstructions and gearbox movement, then adaptability and collision resistance are improved, but torque transfer efficiency and structural stability deteriorate
Solution Approach 1:
The steering shaft is segmented into rigid and flexible portions with distinct functional roles. The rigid shaft portion ensures efficient torque transfer and structural stability, while the flexible shaft portion provides adaptability to obstructions and gearbox movement. This segmentation resolves the contradiction between adaptability and power transfer efficiency.
Solution Approach 2:
Different local qualities are assigned to different portions of the steering shaft - the rigid portion provides high torque transfer efficiency and structural stability, while the flexible portion provides high adaptability. This local quality differentiation allows the system to achieve both adaptability and power transfer efficiency simultaneously.
Data Source
AI summary
A steering shaft apparatus for transferring a torque from a steering wheel to a steering gearbox while adapting to obstructions and movement of the steering gearbox relative to the steering wheel includes a rigid shaft and a flexible shaft. The rigid shaft connects to the steering wheel and the flexible shaft connects to an input of the steering gearbox. A torque applied to the steering wheel is transferred through the rigid shaft and the flexible shaft to the input. The flexible shaft bends as needed while continuing to serve to transfer the torque.