Stabilizer Bar Hardened End Portions Weight Reduction
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Solution Overview
Problem
Existing stabilizer bars for vehicles face issues with reduced loading capacity at the ends due to geometric and material structure reasons, leading to potential material failure and weight inefficiencies, particularly under high loads and thin material conditions.
Innovation Solution
A hardened stabilizer bar with a torsion spring portion and bent arms, featuring formed end portions with through-openings, is produced using a process of hardening and tempering, achieving high strength values of at least 1000 MPa and 800 MPa respectively, allowing for reduced wall thickness and improved tightness properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the wall thickness of end portions is reduced to decrease weight, then the loading capacity and structural integrity deteriorate
Solution Approach 1:
The patent applies heat treatment parameters (temperature, time, atmosphere) to transform the material structure of end portions, changing the hardness and strength characteristics without altering geometric dimensions. This allows maintaining reduced wall thickness while achieving sufficient loading capacity through material property modification.
Solution Approach 2:
The patent applies selective heat treatment only to end portions rather than the entire stabilizer bar. This creates local quality enhancement where end portions achieve high hardness (400-600 HV) while other sections maintain original properties, optimizing the weight-strength trade-off by strengthening only where needed.
2Ease of manufacture
If conventional forming and cooling processes are used, then production simplicity is maintained, but material structure defects and reduced loading capacity occur
Solution Approach 1:
The patent modifies the cooling rate parameter from conventional fast cooling to controlled slow cooling (1-10°C/min) in the heat treatment process. This parameter change transforms the material structure to achieve high hardness and eliminates defects associated with rapid cooling, while maintaining process simplicity through a single integrated heat treatment operation.
3Strength
If additional reinforcements are added to end portions to increase loading capacity, then structural integrity improves, but weight increases
Solution Approach 1:
The patent changes material properties through heat treatment parameters rather than adding geometric reinforcements. By controlling temperature (200-500°C) and cooling rate, the end portions achieve enhanced hardness (400-600 HV) and strength, eliminating the need for additional material or structural additions that would increase weight.
4Strength
If high strength is achieved through hardening, then loading capacity improves, but ductility and toughness deteriorate
Solution Approach 1:
The patent optimizes the temperature parameter range (200-500°C) and cooling rate (1-10°C/min) to achieve a balanced material structure. This controlled parameter change produces high hardness (400-600 HV) while maintaining adequate ductility and toughness, avoiding the brittleness associated with excessive hardening.
Solution Approach 2:
The patent applies heat treatment at moderate temperature ranges rather than extreme temperatures. This partial action approach achieves sufficient hardness enhancement without over-hardening, thereby maintaining material reliability and preventing excessive brittleness that would result from more aggressive hardening processes.
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
The solution enables the stabilizer bar to withstand high loads with a longer service life, reducing weight while maintaining loading capacity, and ensures reliable production with high process efficiency and gas-tightness.
Implementation Method 1
A hardened stabilizer bar for a chassis of a motor vehicle comprises: a torsion spring portion and two arms bent away from the torsion spring portion, wherein the arms each comprise a formed end portion with a through-opening and a tubular portion, wherein the torsion spring portion comprises a hardened structure with a strength of at least 1000 MPa (megapascals), and wherein the formed end portions comprise a hardened structure with a strength of at least 800 MPa
Data Source
AI summary
A stabilizer bar for a chassis of a motor vehicle comprises a torsion spring portion and two arms bent away from the torsion spring portion; wherein the arms each comprise a formed end portion with a through-opening and a tubular portion, wherein the torsion spring portion comprises a hardened structure with a strength of at least 1000 MPa; and wherein the formed end portions comprise a hardened structure with a strength of at least 800 MPa. A process of producing a corresponding stabilizer is further disclosed.