Rear Wheel Steering Lock Assembly for Agricultural Machinery
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Solution Overview
Problem
Four-wheel steering systems in agricultural machines face challenges in managing collision-induced rear wheel misalignment and steering errors, particularly when high-speed travel on roads is required, necessitating a system to safely prevent rear wheel steering.
Innovation Solution
A lock system is implemented at each rear wheel assembly, using an electronically controlled actuator to physically lock or unlock the rear wheel assemblies, with sensors monitoring the lock cylinders to determine if four-wheel steering is enabled or disabled, and an interlock mechanism that defaults to locking the wheels straight to prevent steering errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If four-wheel steering is implemented to improve maneuverability, then the agricultural machine can make tight turns in field headlands, but collision-induced rear wheel misalignment and steering errors become difficult to manage
Solution Approach 1:
The lock assembly proactively prevents rear wheel steering by mechanically locking the steerable leg to the swing arm when four-wheel steering is not required. This preliminary action eliminates the possibility of collision-induced misalignment and steering errors before they can occur, rather than attempting to correct them after detection
Solution Approach 2:
The system defaults to a locked state for the rear wheels and requires active engagement to enable four-wheel steering. This preliminary positioning ensures that the steering system is in a safe, reliable state by default, and only transitions to the maneuverable four-wheel steering mode when explicitly activated and controlled
2Ease of operation
If four-wheel steering is used to enhance handling, then the agricultural machine improves maneuverability, but it becomes unsafe when traveling on roads at high speed
Solution Approach 1:
The lock assembly preemptively prevents the harmful effect of high-speed steering by mechanically locking the rear wheels in a fixed position when four-wheel steering is not intended to be used. This eliminates the safety risk before the machine travels at high speed, rather than attempting to manage the risk during high-speed operation
3Object-affected harmful factors
If a lock assembly is added to prevent rear wheel steering, then safety is improved when traveling on roads, but the device complexity increases
Solution Approach 1:
The lock assembly is integrated with the existing steering mechanism by coupling the lock cylinder to the steerable leg and swing arm. This merging approach combines the locking function with the existing steering components, adding safety functionality while minimizing the increase in overall system complexity
Solution Approach 2:
The lock cylinder acts as an intermediary mechanical element between the steerable leg and swing arm. It provides the locking function through a simple mechanical interface (pocket and block) that mediates between the need for steering capability and the need for fixed wheel positioning, adding minimal complexity while achieving the safety objective
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 system effectively prevents rear wheel steering when undesirable, ensuring safe operation on roads and maintaining proper handling characteristics by continuously monitoring and reporting wheel positions to the controller.
Implementation Method 1
The lock system can use an electronically controlled actuator to hydraulically drive or retract a lock cylinder to lock or unlock the rear wheel assemblies
Data Source
AI summary
A lock system can be provided at each rear wheel assembly of a four wheel steering system to physically lock the rear wheel assemblies in a fixed direction to safely prevent rear wheel steering when such feature is undesirable. The lock system can use an electronically controlled actuator to hydraulically drive or retract a lock cylinder to lock or unlock the rear wheel assemblies, respectively. Sensors can be used to detect whether the lock cylinders are driven or retracted by their respective actuators, so that a controller monitoring the sensors can determine whether four wheel steering is enabled or disabled.