Ball Joint Double-Shear Bracket for Off-Road Suspension Knuckles
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Solution Overview
Problem
Ball joints in vehicles, particularly in off-road vehicles, experience frequent wear and failure due to single shear mounting configurations, leading to increased costs, weight, and maintenance needs.
Innovation Solution
A support device and method to convert single shear mounting configurations to double shear configurations by using a support bracket with attachment members and mechanisms to provide additional support at a second location on the spherical bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single shear mounting configuration is used for ball joints, then the device complexity is reduced and ease of manufacture is improved, but the strength and reliability of the ball joint assembly deteriorates due to increased stress on single mounting points
Solution Approach 1:
The ball joint mounting system is segmented into two separate mounting points instead of one, distributing the load across multiple locations. The support bracket creates a first mounting point on the suspension knuckle and a second mounting point on the spherical bearing, dividing the shear forces into two separate承载 paths and reducing stress concentration at any single point.
Solution Approach 2:
The support bracket merges multiple functions into a single component: it provides structural support for the spherical bearing, creates additional mounting points, and distributes shear forces across the assembly. By combining these functions, the system achieves improved strength without proportionally increasing overall device complexity.
2Strength
If ball joints are designed to withstand high shear forces in single shear configuration, then the strength is improved, but the weight and bulk of the vehicle increases
Solution Approach 1:
The load-bearing function is segmented across two mounting points rather than requiring one oversized mounting point. This allows the use of smaller, lighter components at each location while maintaining overall strength, reducing the need for excessive material and weight in individual ball joint components.
Solution Approach 2:
The mounting configuration transitions from a single-point (zero-dimensional) connection to a two-point (one-dimensional) connection, adding a spatial dimension to the load distribution. This dimensional change allows forces to be distributed along a line rather than concentrated at a point, enabling lighter component design while maintaining strength.
3Strength
If ball joints are designed to withstand high shear forces, then the strength is improved, but the manufacturing cost increases
Solution Approach 1:
The support bracket is designed as a separate, modular component that can be manufactured independently using standard fabrication processes. This segmentation allows for simpler manufacturing of individual parts compared to creating a single complex high-strength ball joint, potentially reducing overall manufacturing cost while achieving the required strength through the distributed mounting configuration.
4Reliability
If a single shear mounting configuration is used, then the device complexity is reduced, but the reliability deteriorates due to frequent wear and failure in off-road conditions
Solution Approach 1:
The reliability is improved by segmenting the single failure point into two separate mounting points. In off-road conditions where high shear forces are common, this segmentation means that if one mounting point experiences wear or failure, the other can continue to support the load, providing redundancy and significantly improving overall system reliability.
Solution Approach 2:
The support bracket and dual mounting configuration act as a preventive measure against failure by distributing stresses before they can concentrate and cause damage. The design anticipates high-load off-road conditions and prepares for them by creating a load-path that resists wear and failure modes common in single shear configurations.
Data Source
AI summary
A support device is configured for strengthening a single shear mounting configuration of a ball joint affixed on a suspension knuckle at a first location. The support device includes a support bracket with at least one attachment member and a support mechanism. The at least one attachment member is configured for attaching the support bracket to the suspension knuckle approximate a spherical bearing attached to the suspension knuckle at the first location. The support mechanism is affixed to the at least one attachment member. The support mechanism is configured to support the spherical bearing at a second location on the spherical bearing. Wherein, the support bracket is configured to provide a double shear mounting configuration of the spherical bearing on the suspension knuckle via the combined support from the first location in combination with the second location on the spherical bearing.