Steering Knuckle Extension Arm for Larger Rear-Wheel Angles
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Solution Overview
Problem
The existing design of steering knuckles in vehicles is unable to facilitate the articulation required for rear wheel steering mechanisms, resulting in a small rear wheel steering angle and a large steering radius, which affects the vehicle's maneuverability and stability.
Innovation Solution
A steering knuckle design featuring a housing and extension arm with strategically placed assembly holes for ball joint connections, including a kingpin axis, and a reinforcing rib to enhance strength and reliability, allowing for increased articulation and freedom of movement of the tie rod, thereby enabling larger steering angles and reducing the steering radius.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the steering knuckle uses a conventional design without extension arm, then the structure is simple, but the rear wheel steering angle is small and steering radius is large
Solution Approach 1:
The steering knuckle is divided into a housing and an extension arm that can be formed separately or as one piece, allowing the extension arm to protrude from the housing to provide additional articulation space for the tie rod, thereby increasing the rear wheel steering angle without overly complicating the overall structure
Solution Approach 2:
The extension arm adds a spatial dimension to the steering knuckle structure by protruding outward, creating additional room for tie rod articulation and enabling larger steering angles through extended rotational movement space
2Strength
If the extension arm is made with complex reinforcement, then the strength is increased, but the weight increases
Solution Approach 1:
A reinforcing rib is strategically disposed within the housing on a side close to the extension arm, providing localized strength enhancement exactly where the bending forces are greatest during steering operations, rather than uniformly reinforcing the entire extension arm, thus minimizing weight increase while maximizing strength where needed
Solution Approach 2:
The steering knuckle can be made from aluminum material, utilizing the high strength-to-weight ratio of aluminum alloys to achieve sufficient strength with reduced weight compared to traditional steel constructions
3Ease of manufacture
If the housing and extension arm are formed separately, then the manufacturing flexibility is increased, but the production cost and assembly complexity increase
Solution Approach 1:
The housing and extension arm are formed as one piece through integrated manufacturing processes, eliminating the need for separate assembly operations, reducing assembly complexity, and lowering production costs while maintaining the design flexibility to optimize the extension arm geometry for steering performance
Data Source
AI summary
A steering knuckle includes a housing and an extension arm. One end of the extension arm is disposed on the housing on a side corresponding to a position of a rear wheel. A first assembly hole configured to fit a ball joint tie rod is created at another end of the extension arm. The housing includes a bottom face as well as a first end face and a second end face disposed opposite to each other on the bottom face. A second assembly hole configured to fit a ball joint lower control arm is created on the first end face. A third assembly hole configured to fit a ball joint upper control arm assembly is created on the second end face. A connecting line between the second assembly hole and the third assembly hole forms a kingpin axis.