Suspended Axle Connecting Rods Vertical Motion
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Solution Overview
Problem
Existing self-propelled agricultural sprayer suspension systems face issues with costly machined castings and chrome spindles, or suffer from tracking problems due to arc motion caused by lateral stabilizer bars in alternative designs.
Innovation Solution
A suspension system using a pair of connecting rods robustly mounted between parallel beams of the vehicle frame, allowing near vertical up and down motion of axle ends, eliminating the need for expensive spindles and preventing arc motion that causes tracking issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pair of connecting rods are used to suspend the axle, then the cost is reduced by eliminating expensive chrome spindles and machined castings, but the axle swings in an arc creating tracking issues
Solution Approach 1:
The patent introduces a fourth connecting rod to create a three-dimensional suspension geometry. By adding this rod that connects the axle end to a different location on the vehicle frame, the system transforms the simple arc-shaped motion into a more complex three-dimensional path that maintains better tracking characteristics while preserving the cost benefits of the simpler rod-based suspension.
Solution Approach 2:
The suspension system is divided into multiple independent connecting rods (at least three, preferably four) that can be individually optimized. Each rod connects specific points on the axle to specific points on the vehicle frame, allowing the motion of each rod to be independently controlled to achieve both cost effectiveness and tracking performance.
2Reliability
If chrome spindles and machined castings are used, then reliable wheel suspension is achieved, but the manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive, precision-machined components (chrome spindles and machined castings) with simpler, cheaper connecting rods made from standard steel sections. These rods are designed to be robust and durable enough for agricultural use but are much more economical to manufacture, maintaining reliability while dramatically reducing cost.
Solution Approach 2:
Instead of using complex, expensive chrome-plated spindle assemblies, the patent uses simple cylindrical or tubular rod copies that perform the same suspension function. The rods replicate the essential telescoping motion capability without requiring expensive materials or machining processes.
3Reliability
If a lateral stabilizer bar is added to prevent axle swing, then tracking stability improves, but the axle motion becomes constrained and complexity increases
Solution Approach 1:
The connecting rods serve multiple functions simultaneously: they provide suspension motion control, lateral stability, and tracking maintenance. By designing the rod geometry and attachment points appropriately, the same components that enable vertical wheel motion also inherently prevent excessive lateral swing and maintain tracking, eliminating the need for separate stabilizer bars.
Data Source
AI summary
A vehicle is provided with an axle suspended from a main frame of the vehicle by right- and left-hand pairs of connecting rods. As viewed from the top, one of each of the right- and left-hand pairs of connecting rods crosses the other of the pair of rods, and, as viewed from the side, the right- and left-hand pairs of rods are disposed parallel to each other. This arrangement of the connecting rods results in the axle moving substantially vertically up and down during operation of vehicle over uneven terrain.