Rear Wheel Steering Linkage Bending Load Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rear wheel steering devices face challenges in reducing the lead diameter and motor capacity while maintaining bending strength and preventing buckling due to axial loads, leading to increased weight and manufacturing costs.
Innovation Solution
A steering linkage structure with a steering shaft having a small-diameter portion and a large-diameter portion, where the linkages are coupled to both ends and protrude into the housing to support bending loads, allowing for a smaller lead diameter and reduced motor capacity, and featuring threaded taps, grooves, and bushings for secure fastening and axial load support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lead diameter is increased to maintain bending strength, then the bending strength is improved, but the weight and manufacturing cost increase
Solution Approach 1:
The steering shaft is divided into two separate steering shafts (left and right), each with its own lead engagement portion. This segmentation allows each shaft to have a smaller lead diameter while collectively supporting the bending load, thereby reducing weight and motor capacity requirements while maintaining overall bending strength.
Solution Approach 2:
The invention transitions from a single steering shaft to a dual steering shaft configuration, adding a spatial dimension to the load distribution. By distributing the bending load across two shafts engaged with the screw nut, the system achieves the required bending strength with smaller individual components, reducing overall weight and motor capacity.
2Strength
If the lead diameter is increased to maintain bending strength, then the bending strength is improved, but the motor capacity increases
Solution Approach 1:
The steering shaft is divided into two separate steering shafts (left and right), each with its own lead engagement portion. This segmentation allows each shaft to have a smaller lead diameter while collectively supporting the bending load, thereby reducing weight and motor capacity requirements while maintaining overall bending strength.
Solution Approach 2:
The invention transitions from a single steering shaft to a dual steering shaft configuration, adding a spatial dimension to the load distribution. By distributing the bending load across two shafts engaged with the screw nut, the system achieves the required bending strength with smaller individual components, reducing overall weight and motor capacity.
3Ease of manufacture
If the coupling portion diameter is reduced to improve assembly ability, then the assembly ability is improved, but the buckling resistance deteriorates
Solution Approach 1:
The invention divides the steering shaft into two separate shafts with smaller coupling portions, improving assembly ability. The buckling resistance is maintained through the distributed load path and the specific geometric design of the coupling portions that optimize structural efficiency despite the reduced diameter.
Solution Approach 2:
The coupling portions are designed with optimized local geometry and material distribution to achieve maximum buckling resistance for the given diameter. The local structural features of the coupling portions are specifically tailored to withstand axial loads while maintaining a compact size for easy assembly.
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
This design enables a smaller lead diameter and reduced motor capacity, enhancing bending strength against buckling loads, reducing weight and manufacturing costs, and improving assembly efficiency.
Implementation Method 1
a screw nut 110 rotated by power from the driving motor 100, a steering shaft 120 reciprocated to the left and right by the rotation of the screw nut 110, and a linkage 140 coupled to both ends of the steering shaft 120 through ball joints 130
Data Source
AI summary
A steering linkage structure of a rear wheel device may include a housing receiving a screw nut integrally and rotatably connected to a driving motor, a steering shaft inserted in the housing and having a lead portion coupled to the screw nut that rotates and being movable left and right in the housing by the screw nut, and linkages coupled to the steering shaft to connect both ends of the steering shaft to rear wheels, in which coupling portions where the linkages are coupled to the steering shaft are inserted and protrude into and out of the housing, such that when a bending load is applied, the coupling portions support the bending load and are in contact with the housing.