Riding Mower Trailing Arm Suspension for Rough Terrain
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Solution Overview
Problem
Zero-turn-radius (ZTR) riding mowers experience jarring and vibrations when operating over rough terrain, leading to uncomfortable ride for the operator and uneven cutting of grass due to the bouncing of the mower deck and cutting blades.
Innovation Solution
A trailing arm suspension system that provides independent upward and rearward movement of the rear wheels along an arced path, using longitudinally and laterally oriented control arms to absorb impacts, with adjustable lengths for fine-tuning the orientation and movement, and resilient members to dampen vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ZTR riding mower operates over rough terrain, then it can navigate bumps and holes, but it causes bouncing and jarring that makes operator uncomfortable and affects cutting performance
Solution Approach 1:
The rear suspension system divides the rigid rear axle into independent trailing arms that can move separately, allowing each wheel to independently absorb bumps and holes in the terrain, thereby maintaining operator comfort while navigating rough surfaces
Solution Approach 2:
The trailing arm suspension system is pre-configured with resilient members that provide cushioning before impacts occur, allowing the system to absorb shocks from bumps and holes before they reach the operator and cutting deck
2Adaptability or versatility
If ZTR riding mower operates over rough terrain, then it can navigate obstacles, but it causes the cutting deck and blades to move vertically resulting in uneven cutting
Solution Approach 1:
The cutting deck is decoupled from the rear suspension system through independent trailing arms, separating the function of terrain navigation from cutting precision, allowing the deck to remain stable while wheels absorb shocks
Solution Approach 2:
The trailing arm suspension provides advance cushioning that prevents vertical movement of the cutting deck when encountering obstacles, maintaining cutting uniformity while allowing wheel movement for terrain adaptation
3Device complexity
If rigid rear axle is used, then structural simplicity is maintained, but jarring and vibrations are transmitted to the operator and deck
Solution Approach 1:
The rigid rear axle is replaced with dynamic trailing arms that can pivot and move independently, transforming the static structure into a dynamic system that absorbs vibrations and jarring while maintaining relative simplicity through straightforward mechanical linkages
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The suspension system effectively reduces jarring and vibrations, enhancing the operator's comfort and maintaining even cutting quality by absorbing both vertical and horizontal elements of impact, thereby improving the overall performance and adjustability of the mower.
Implementation Method 1
resilient members to dampen vibrations
Implementation Method 2
resilient members to dampen vibrations
Data Source
AI summary
Provided is a trailing arm riding mower suspension system that includes trailing arms adapted to support hydraulic motor units and having leading ends pivotally coupled to a mower frame by way of leading end spherical joints and trailing ends having hydraulic drive unit mounts, where the trailing arms are adapted to pivot about leading end pivot locations defined by the leading end spherical joints.