Magnesium Diecast Shock Tower with Steel Bracket
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Solution Overview
Problem
Existing shock towers for automotive vehicles face challenges in achieving weight reduction while maintaining structural integrity and affordability, with steel towers being too heavy and aluminum towers being overly expensive due to labor-intensive manufacturing processes.
Innovation Solution
A shock tower assembly composed of a thin-walled diecast magnesium or magnesium alloy body combined with a steel bridging bracket, using an insulating adhesive layer and mechanical fasteners like self-piercing rivets to prevent galvanic corrosion, and structural ribbings for added strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If shock towers are made from stamped steel, then structural integrity and affordability are maintained, but weight is excessive
Solution Approach 1:
The patent changes the material parameter from steel to magnesium alloy, which has a density approximately 3 times lighter than steel. This material substitution enables significant weight reduction while maintaining structural integrity through the alloy's inherent strength properties and optimized casting design.
Solution Approach 2:
The patent replaces the traditional stamped steel construction with a die-cast magnesium alloy construction. This substitution changes the manufacturing mechanism from stamping and assembly to integral die casting, eliminating the need for multiple pieces and fasteners, thereby reducing weight while improving structural continuity and strength.
2Weight of moving object
If shock towers are made from aluminum by VHPDC, then weight is reduced, but manufacturing cost and complexity increase significantly
Solution Approach 1:
The patent adopts magnesium alloy die casting, which uses simpler, less expensive equipment compared to VHPDC. The process eliminates the need for vacuum systems, complex heat treatment facilities, and extensive machining operations, thereby reducing manufacturing complexity and cost while achieving comparable or superior weight reduction.
Solution Approach 2:
The patent extracts and eliminates the cumbersome post-casting operations required for aluminum VHPDC parts, such as x-ray examination, heat treatment, straightening, and machining. The magnesium die casting process produces parts that require minimal post-processing, thereby simplifying the manufacturing workflow and reducing labor intensity.
3Weight of moving object
If aluminum shock towers use VHPDC process, then weight is reduced, but production cost increases due to labor-intensive processes
Solution Approach 1:
The patent employs magnesium die casting, which uses less expensive, simpler equipment and requires minimal post-processing operations. This approach eliminates labor-intensive steps such as heat treatment, straightening, and machining, thereby improving production efficiency and reducing labor costs while maintaining weight reduction benefits.
4Strength
If aluminum shock towers are over-designed with minimum wall thickness of 2.5 mm, then structural integrity is ensured, but weight and cost increase
Solution Approach 1:
The patent changes the material parameter from aluminum to magnesium alloy, which has superior strength-to-weight ratio. This enables the use of thinner wall sections and reduced ribbing while maintaining or improving structural integrity, thereby achieving further weight reduction without compromising strength.
Solution Approach 2:
The patent applies local quality optimization by strategically placing ribs and thickening sections only where structural support is required, rather than uniformly increasing wall thickness throughout. This localized reinforcement approach maintains structural integrity in critical areas while minimizing weight in non-critical areas.
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 results in a lightweight, cost-effective shock tower that is significantly lighter than steel and less expensive than aluminum options, with improved vibration absorption and structural integrity, while simplifying the manufacturing process and reducing production costs.
Implementation Method 1
An insulating adhesive layer is formed between the cast shock tower body and the steel bridging bracket
Implementation Method 2
A mechanical fastener is used for fastening the cast shock tower body to said steel bridging bracket
Data Source
AI summary
A shock tower assembly includes a cast shock tower body composed of magnesium or magnesium alloy and at least one steel bridging bracket. An insulating adhesive layer is formed between the tower body and the bracket. A mechanical fastener is used for fastening the tower body to the bracket. One or more structural ribbings are formed on the tower body. The mechanical fastener may be selected from any of several mechanical fasteners, including self-piercing rivets. Alternatively, a screw boss may be formed for receiving a screw. The rivet may be inserted from the bracket into the shock tower body or from the shock tower body into the bracket in which case an insulating layer is positioned between the head of the self-piercing rivet and the cast shock tower body. A sealant is preferably formed along the intersection of the cast shock tower body and the steel bridging bracket.