Central Joint Captive Securing for Three-Point Suspension Links
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Solution Overview
Problem
Existing central joints in three-point suspension links of commercial vehicles are prone to separation due to wear or overload, which can lead to material damage and safety risks, as current captive securing arrangements only prevent separation in one spatial direction and may fail under roll deflection or exceptional loads.
Innovation Solution
A central joint with a captive securing arrangement that extends perpendicular to the central axis of the axle connection in two spatial directions, providing a stop mechanism to prevent separation of the housing and axle connection, even in the event of ball joint failure, and is designed to accommodate various loads and movements, including roll, compression, and braking torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a crossbar is oriented exclusively in transverse direction to provide free passage during compression and rebound movements, then the crossbar can move freely during normal operation, but the crossbar cannot effectively prevent central joint separation when roll deflection occurs
Solution Approach 1:
The captive securing arrangement is extended from a single transverse direction into a three-dimensional configuration with arms extending in multiple spatial directions (transverse, longitudinal, and vertical dimensions). This dimensional expansion allows the securing arrangement to simultaneously provide free passage during compression/rebound movements while effectively preventing separation under roll deflection by engaging the housing in multiple directions.
2Reliability
If both ends of the crossbar act as stops to prevent separation, then separation prevention is effective when there is no roll deflection, but only one end acts when roll deflection occurs, causing that single end to be overloaded and potentially fail
Solution Approach 1:
By configuring the captive securing arrangement with arms extending in multiple spatial directions rather than a single transverse line, the load distribution during roll deflection is improved. Multiple arms can simultaneously engage the housing at different locations and orientations, sharing the chassis forces and exceptional loads across several contact points rather than concentrating them on a single end.
Solution Approach 2:
The invention combines multiple securing arms extending in different directions into a single integrated captive securing arrangement. This unified structure works cooperatively to prevent separation, with each arm contributing to the overall securing function and distributing loads across the entire arrangement rather than isolating the stress on one end.
3Reliability
If the crossbar is designed to act as a stop in one direction, then it can prevent separation under normal conditions, but it may be bent or broken under exceptional loads such as driving over a curb
Solution Approach 1:
The multi-directional arm configuration provides inherent load distribution and redundancy. When exceptional loads occur, the three-dimensional arrangement can accommodate forces from multiple directions simultaneously, with each arm sharing the burden based on its orientation and engagement with the housing. This prevents any single element from being overloaded beyond its strength limits.
Data Source
AI summary
A three-point suspension link has a housing supported by a ball joint so as to be rotatably and swivelably movable relative to an axle connection of the link. The link further has a captive securing arrangement functioning as a stop and extending perpendicular to the central axis of the axle connection so as to prevent a separation of the housing and axle connection in the event of failure of the ball joint. The captive securing arrangement extends perpendicular to the central axis of the axle connection operatively in two spatial directions. The three-point suspension link is formed as an axle guide link for guiding a rigid axle.