Steering Input Assembly With Torsion Bar for Compact Steer-By-Wire
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Solution Overview
Problem
The existing steering systems face challenges with large mechanical components that occupy significant space in vehicles, making them difficult to use efficiently, and the steer-by-wire system does not adequately improve space utilization for the user, while also being hard to assemble and prone to errors in component sizes.
Innovation Solution
A compact electronic control steering system with a grip, torsion bar, upper and lower shafts, sensors, and a motor shaft, along with a reaction force generation mechanism using a guide bushing, spring, and restriction pin, which improves assemblability and reduces component size errors, allowing for efficient spatial utilization and user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical steering system is used, then the steering function is reliable, but the volume occupied by mechanical components is large
Solution Approach 1:
The patent replaces the traditional mechanical steering system with a steer-by-wire system that uses electrical signals and sensors instead of direct mechanical connections. The mechanical linkage between the handle and tie rod is eliminated, substituting it with electronic sensors to detect handle position and actuators to control the tie rod, thereby significantly reducing the volume of mechanical components while maintaining steering functionality
Solution Approach 2:
The patent changes the operating parameters of the steering system by transitioning from pure mechanical force transmission to an electro-mechanical system where electrical signals carry steering information. This parameter change allows the system to achieve the same steering control function with much smaller component dimensions
2Volume of stationary object
If the steer-by-wire system is used, then the space utilization is improved, but the assemblability becomes difficult
Solution Approach 1:
The patent divides the steering system into modular segments: the handle assembly with sensor, the intermediate electrical connection components, and the actuator assembly at the tie rod. This segmentation allows each module to be manufactured and tested independently, then assembled together, significantly improving assemblability despite the complex electro-mechanical integration required
Solution Approach 2:
The patent designs universal connection interfaces and standardized electrical connectors that can be used across different components of the steer-by-wire system. This universality simplifies the assembly process by reducing the variety of unique connection types that must be precisely matched during manufacturing
3Volume of stationary object
If the steer-by-wire system is used, then the space utilization is improved, but the error in sizes of constituent components increases
Solution Approach 1:
The patent incorporates sensors that provide feedback on the actual position and status of components during assembly and operation. This feedback mechanism allows for real-time detection and compensation of dimensional variations, ensuring that even with tolerances in component manufacturing, the overall system assembly achieves the required precision
Solution Approach 2:
The patent employs adjustable and adaptable components that can be fine-tuned during assembly to compensate for size errors. The system includes adjustable mounting positions and configurable electrical connections that allow technicians to optimize the fit and alignment of components, reducing the impact of manufacturing tolerances
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 system achieves a smaller volume, improved assemblability, reduced component errors, and enhanced user convenience by optimizing space utilization and stability, while maintaining accurate steering control.
Implementation Method 1
a spring disposed in the input part housing and configured to elastically support the guide bushing in a direction toward the ball
Implementation Method 2
a torsion bar, an end portion of which is connected to the lower shaft, wherein the torsion bar is at least partially disposed in the lower shaft
Data Source
AI summary
A steering input device according to the present disclosure includes a grip part, a lower shaft engaged to the grip part and configured to be rotated by a rotation of the grip part, a torsion bar, an end portion of which is connected to the lower shaft, wherein the torsion bar is at least partially disposed in the lower shaft, a connection shaft connected to the torsion bar and configured to accommodate at least a part of the torsion bar, the connection shaft being connected to the lower shaft, a sensor configured to detect a rotation angle of the lower shaft or the connection shaft, and a motor shaft connected to the connection shaft and configured to be rotated by a motor.