Torsion Beam Axle Spindle Block Design for Durability
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Solution Overview
Problem
Conventional coupled torsion beam axle suspension systems experience durability issues due to localized stress concentration and heat transformation at the welding portion between the trailing arm and spindle plate, leading to potential cracks and reduced system durability.
Innovation Solution
The suspension system replaces the welded spindle plate with a spindle block that is integrally formed with engagement threads, allowing engagement bolts to secure the spindle to the trailing arm, eliminating the need for welding and reducing component count, weight, and production costs, while ensuring proper wheel alignment through coordinated thread engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to connect the spindle plate to the trailing arm, then the connection strength is improved, but localized stress concentration and heat transformation occur leading to reduced durability
Solution Approach 1:
The connection is divided into multiple discrete bolted joints instead of a single welded joint. The spindle block is connected to the trailing arm through multiple engagement bolts distributed at different locations, segmenting the stress distribution and avoiding localized stress concentration at a single welding point.
Solution Approach 2:
The welding process is replaced with a mechanical bolted connection system. Instead of using thermal energy to join materials (welding), the invention uses mechanical fasteners (engagement bolts) to connect the spindle block to the trailing arm, eliminating heat transformation and associated durability issues.
2Strength
If a spindle plate is welded to the trailing arm, then the spindle can be fixed securely, but the component count and manufacturing complexity increase
Solution Approach 1:
The spindle block integrates multiple functions into a single component. The spindle, engagement threads, and mounting features are combined in one integrally formed spindle block, eliminating the need for separate spindle plates and reducing the number of parts that need to be assembled and welded.
Solution Approach 2:
The spindle block serves multiple functions simultaneously: it provides the spindle for wheel mounting, contains engagement threads for bolt connection, and provides structural support for the trailing arm connection. This multi-functionality reduces the overall component count while maintaining secure spindle fixation.
3Strength
If welding is used to connect components, then strong joints are achieved, but heat transformation causes localized stress and potential cracks
Solution Approach 1:
The thermal welding process is replaced with a mechanical bolted connection system. Engagement bolts provide strong joints through clamping force and friction, achieving adequate joint strength without the harmful thermal effects of welding such as heat transformation, localized stress concentration, and potential crack formation.
Solution Approach 2:
Engagement bolts serve as intermediary elements between the spindle block and trailing arm. These bolts transfer and distribute mechanical loads through controlled stress paths, acting as mediators that achieve strong connections without direct material fusion and without the harmful thermal effects of welding.
Data Source
AI summary
A suspension system of a coupled torsion beam axle type may include a torsion beam that is disposed in the width direction of a vehicle body, left/right trailing arms that are mounted on respective ends of the torsion beam to be extended in the rearward direction of the vehicle body, and a spindle block that is mounted on one end of each of the respective trailing arms and in which a spindle is integrally formed in the front end surface thereof for a wheel to be mounted.