Steer-by-Wire Steering Stop Using Screw Shaft and Guide Member
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Steer by wire steering systems lack mechanical connection between the steering wheel and wheels, leading to indefinite rotation and reduced driver steering feel and stability when the wheel reaches its maximum point.
Innovation Solution
A steer by wire type steering apparatus with a screw shaft, moving member, and guide members to mechanically restrict the steering wheel's rotation at maximum point, using a screw shaft with an outer circumferential screw portion and a moving member with an inner circumferential screw portion, guided by guide members within a housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a steer by wire type steering system is used to eliminate mechanical connection components, then the steering system becomes more simplified and modern, but the steering wheel can rotate indefinitely without mechanical stopping, reducing driver steering feel and stability
Solution Approach 1:
The patent replaces traditional mechanical connection components (steering column, universal joint, pinion shaft) with an electric motor-driven system. The steering wheel is connected to an electric motor through a sensor, and the motor controls the wheel steering angle, eliminating the need for direct mechanical connection while maintaining steering functionality.
Solution Approach 2:
The patent introduces a reaction force generation mechanism as an intermediary between the steering wheel and the wheel. This mechanism generates a reaction force that opposes the steering wheel rotation, providing the driver with tactile feedback and a sense of steering resistance, thereby improving steering feel without requiring direct mechanical connection to the wheel.
2Ease of operation
If the steering wheel is allowed to rotate freely without mechanical connection, then the steering system achieves greater flexibility and ease of operation, but the driver loses steering feeling and stability when the wheel reaches maximum rotation point
Solution Approach 1:
The patent employs a reaction force generation mechanism that provides tactile feedback to the driver. When the wheel reaches its maximum steering angle, the mechanism generates a reaction force that opposes further steering wheel rotation, giving the driver a tactile indication of the steering limit and preventing indefinite rotation, thereby maintaining steering stability and feel.
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
Enhances driver's steering feel and safety by preventing the steering wheel from further rotation when the wheel reaches its maximum point, improving steering stability.
Implementation Method 1
a screw shaft coupled to the steering shaft to rotate and having an outer circumferential screw portion formed on an outer circumferential surface, a moving member coupled to an outer peripheral side of the screw shaft, an inner circumferential screw portion corresponding to the outer circumferential screw portion being formed on an inner circumferential surface to move in an axial direction when the screw shaft rotates
Data Source
AI summary
The present embodiments provide a steer by wire type steering apparatus including a screw shaft coupled to the steering shaft to rotate and having an outer circumferential screw portion formed on an outer circumferential surface, a moving member coupled to an outer peripheral side of the screw shaft, an inner circumferential screw portion corresponding to the outer circumferential screw portion being formed on an inner circumferential surface to move in an axial direction when the screw shaft rotates, a housing formed in a cylindrical shape and having the screw shaft and the moving member disposed therein, and at least one guide member provided in the housing to support the outer peripheral side of the moving member and guide the axial movement of the moving member.