Vehicle Stabilizing Bar Geometry for Lower Elbow Stress
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Solution Overview
Problem
Existing stabilizing bars for vehicles are overdimensioned due to constant cross-sections and diameters, leading to excess mass and stress concentration at elbows, which are critical regions under torsion and bending loads.
Innovation Solution
The stabilizing bar features curved portions with a radius of curvature that strictly increases or decreases with distance from the bearing, distributing stresses more uniformly and allowing for lighter or stronger designs with identical mechanical properties, achieved through bending of a metallic billet with a variable cross-section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stabilizing bar uses a constant cross-section and diameter along its entire length, then the manufacturing process is simple, but the bar becomes overdimensioned and excessive mass results
Solution Approach 1:
The stabilizing bar employs a variable cross-section design where the diameter changes along the length of the bar. Specifically, the bar has a larger diameter at the central portion and smaller diameters at the curved portions near the attachment points. This local variation in cross-sectional dimensions allows each section to be optimally sized for its specific functional requirements, eliminating the overdimensioning that occurs with constant cross-section designs.
2Strength
If the stabilizing bar is dimensioned to resist very high forces at the elbow, then the mechanical strength at the critical region is sufficient, but the entire bar becomes overdimensioned and excess mass results
Solution Approach 1:
The variable cross-section design concentrates the larger diameter sections at the central portion where lower strength is needed, and uses smaller diameter sections at the curved portions where the bar is dimensioned specifically for the high forces encountered at the elbows. This localized dimensioning ensures adequate strength at critical regions without overdimensioning the entire bar.
Solution Approach 2:
The invention changes the geometric parameters (diameter and cross-sectional area) of the stabilizing bar along its length. By varying these parameters according to the local stress requirements, the bar achieves optimal strength-to-weight ratio, with larger dimensions at the central portion and smaller dimensions at the curved portions near the attachment points.
3Adaptability or versatility
If the stabilizing bar has a complex three-dimensional shape with multiple elbows in different planes, then the bar adapts to vehicle space constraints, but stress concentration increases at the curved portions
Solution Approach 1:
The variable cross-section design addresses stress concentration at curved portions by providing larger diameter sections at these critical locations. The bar maintains its complex three-dimensional shape with multiple elbows in different planes to adapt to vehicle space constraints, while the locally increased dimensions at curved portions reduce stress concentration without compromising the overall geometric adaptation.
Data Source
AI summary
A stabilizing bar for a vehicle, comprising: a central portion, which is elongate; a first attachment portion configured to be attached to a first part of the vehicle secured to a first wheel of the vehicle; and a first bearing configured to be attached to the chassis of the vehicle, the stabilizing bar comprising, between the central portion and the first attachment portion, a first curved portion, the first curved portion being curved along a curve having a radius of curvature which is strictly increasing with increasing distance from the first bearing.