Steering Knuckle Cross-Sectional Width Variation for Load Capacity
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Solution Overview
Problem
Steering knuckles in vehicles, particularly commercial vehicles, face challenges with high loads and vibrations, where existing designs struggle to enhance fatigue strength and load capacity due to limited installation space and the need for reinforcement.
Innovation Solution
The steering knuckle design features a cross-sectional width that narrows at the central axis of the journal and widens with distance, with a concave radius on the inside for reinforcement, allowing for increased load capacity and vibration resistance within the constraints of the available space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the steering knuckle is designed with conventional uniform cross-section, then the installation space is compact, but the load capacity and fatigue strength are insufficient
Solution Approach 1:
The patent applies local quality by varying the cross-sectional width of the steering knuckle along its length. The cross-section is narrowest at the central axis level and widens toward the ends, creating regions of different structural properties. This allows the knuckle to have enhanced strength and fatigue resistance at critical locations (where the cross-section is wider) while maintaining a compact overall volume, thus resolving the contradiction between strength requirements and space constraints.
2Strength
If reinforcements are added to the steering knuckle, then the load capacity increases, but the installation space requirement increases
Solution Approach 1:
Instead of adding discrete reinforcements that would increase overall volume, the patent modifies the cross-sectional geometry of the steering knuckle itself. The varying cross-sectional width (narrowest at central axis, wider at ends) provides inherent structural reinforcement within the existing space envelope, achieving enhanced load capacity without requiring additional space for separate reinforcement elements.
Solution Approach 2:
The patent addresses the strength enhancement need by utilizing the longitudinal dimension of the steering knuckle. By varying the cross-sectional width along the length of the knuckle (creating a tapered or barrel-shaped profile), the design achieves reinforcement through dimensional optimization rather than adding components in the radial or transverse directions, thus avoiding increased installation space requirements.
Data Source
Figure 1~2
Figure 3~4
AI summary
Steering knuckle for vehicles, in particular for commercial vehicles, comprising a stub axle, a knuckle mount, wherein the knuckle mount has a knuckle wall on which the stub axle is arranged and on the opposite side a lower and upper knuckle mount are arranged, wherein the lower and upper knuckle mount each have a bore for receiving a knuckle bolt, wherein the bores are concentric to each other, wherein the cross-sectional area of the knuckle wall has the narrowest cross-sectional width at the height of the central axis of the stub axle and the cross-sectional width of the knuckle wall widens with distance from the central axis of the stub axle.