Steering System Planetary Gear Redundancy
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Solution Overview
Problem
Existing vehicle steering systems are complex and lack a compact, constructively simple design, particularly in steer-by-wire systems without mechanical or hydraulic coupling, which complicates the implementation of manual steering angles and reduces reliability.
Innovation Solution
A steering system utilizing a planetary gear coupled with a steering shaft and sun wheel, incorporating a steering angle sensor connected to a rotating wheel, and an actuator for data-driven steering angle implementation, enabling redundant steering angle recording and adaptive steering responses to vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a steer-by-wire system without mechanical or hydraulic coupling is used, then the steering system becomes more compact and simpler in structure, but the reliability and redundancy of steering angle detection deteriorates
Solution Approach 1:
The steering angle detection function is segmented into multiple independent detection paths: the first steering angle sensor detects the steering angle directly at the steering handle, while the second steering angle sensor detects the steering angle at the planetary gear. This segmentation provides redundant detection capabilities without requiring complex mechanical coupling between the steering handle and steering gear.
Solution Approach 2:
The planetary gear serves as an intermediary element that connects the steering handle to the steering gear. By coupling the second steering angle sensor to the planetary gear, the system obtains steering angle information through this intermediary, enabling reliable detection in a steer-by-wire architecture without direct mechanical coupling between the steering handle and steering gear.
2Reliability
If multiple steering angle sensors are implemented with mechanical coupling, then steering angle detection reliability improves, but the device complexity and space requirements increase
Solution Approach 1:
The patent replaces direct mechanical coupling between the steering handle and steering gear with a steer-by-wire architecture. The planetary gear acts as a compact mechanical intermediary that enables sensor mounting without requiring extensive mechanical linkages, thus maintaining reliability while reducing overall system complexity.
Solution Approach 2:
The planetary gear provides a compact nested structure where the second steering angle sensor can be integrated within the existing gear mechanism. This nesting approach allows multiple sensing functions to be accommodated in a compact space without significantly increasing device complexity.
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 solution provides a compact, reliable steer-by-wire steering system with enhanced redundancy and adaptive steering responses, ensuring precise steering control and increased reliability, suitable for various vehicle types, including passenger cars and commercial vehicles.
Implementation Method 1
the steering system is provided with a planetary gear (11) coupled to the steering handle (2), comprising a sun gear (13) and a planet carrier (17)
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a steering system for a vehicle, comprising a steering handle for manually applying a torque for a steering angle, a steering angle sensor for detecting the steering angle and a steering gear for converting the steering angle into a wheel steering angle. A steering shaft connected to the steering handle is connected to the sun gear or the outer gear of a planetary gear set, the steering angle sensor being connected to an additional rotatable wheel of the planetary gear set.