Axle-to-Beam Mount Assembly Without Line Weld Stress Risers
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Solution Overview
Problem
Existing axle-to-beam connections in heavy-duty vehicle suspension systems rely on line welds, which create stress risers and compromise the integrity of the connection, leading to reduced durability and increased manufacturing and servicing complexity, while requiring the axle and suspension assemblies to be shipped together, limiting flexibility and field serviceability.
Innovation Solution
An axle-to-beam connection system that includes an axle mount assembly securely attached to a beam via a continuous weld-free design, allowing separate shipment and easy on-site assembly, with a mechanical bump stop feature to prevent damage during jounce events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If line welds are used to connect the axle to the beam, then the connection is achieved, but stress risers are created that compromise connection integrity and reduce durability
Solution Approach 1:
The patent removes the harmful line welds from the connection system entirely. Instead of welding the axle to the beam, the invention uses a separate mounting assembly with mounting plates and fasteners that attach to both components without creating stress risers on the axle, thereby extracting the harmful welding process while maintaining connection functionality.
Solution Approach 2:
The patent introduces mounting plates and mounting assemblies as intermediary components between the axle and the beam. These intermediaries facilitate the connection without direct welding between the axle and beam, distributing stresses and eliminating the stress riser problem associated with line welds while maintaining strong connection integrity.
2Ease of manufacture
If the axle and suspension assemblies are shipped together, then the connection is pre-established, but manufacturing and servicing complexity increases
Solution Approach 1:
The patent divides the suspension system into separable components - the axle can be shipped independently from the suspension assemblies. The mounting assemblies are designed to be attached to the axle before shipment, allowing the axle to be manufactured and shipped separately, then assembled with suspension assemblies at the service location, reducing overall system complexity and improving logistics.
3Strength
If welding equipment is required for on-site assembly, then secure connection is achieved, but field serviceability is reduced
Solution Approach 1:
The patent replaces the welding process (thermal/chemical system) with a mechanical fastening system using mounting plates, fasteners, and tightening mechanisms. This substitution allows the connection to be made and serviced using basic hand tools at the field location, dramatically improving serviceability while maintaining strong connection strength through proper mechanical design.
4Strength
If the axle mount assembly is securely attached to the beam, then connection strength is improved, but stress on the axle increases
Solution Approach 1:
The mounting plates serve as intermediaries that distribute the connection forces over a larger area of the axle surface. By attaching the mounting assemblies to the axle through distributed contact areas rather than concentrated weld points, the stress is spread out, reducing peak stress values while maintaining overall connection strength.
Solution Approach 2:
The mounting plates are designed with specific local geometries that optimize stress distribution at the connection points. The plates contact the axle at strategically located areas, providing localized reinforcement where needed while avoiding stress concentration in critical axle regions, thereby maintaining connection strength without increasing overall axle stress.
Data Source
AI summary
An axle-to-beam connection for an axle/suspension system of a heavy-duty vehicle that includes an axle, a beam with an alignment assembly, and an axle mount assembly. The alignment assembly is integrally formed with or is rigidly attached to the beam. The axle mount assembly intimately contacts and captures the axle. The axle is rigidly secured to the axle mount assembly without line welds. The axle mount assembly is removably connected to the alignment assembly to secure the axle to the beam.