Hydraulic Steering Feedback Suppression via Valve Arrangement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydraulic steering systems in tractors and self-propelled machines face challenges in switching between feedback and non-feedback modes, requiring additional electrical systems and complex valve arrangements to manage steering behavior effectively.
Innovation Solution
A hydraulic steering system with a feedback suppression device featuring a purely hydraulically activated valve arrangement, allowing for easy switching between feedback and non-feedback modes without the need for an electrical system, using a valve arrangement with hydraulic control inlets and pretensioning devices to prioritize the steering unit over the feedback suppression device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electrically activated valve is used to suppress feedback, then the feedback behavior can be changed, but additional electrical systems and complex valve arrangements are required
Solution Approach 1:
The patent replaces the electrically activated valve with a purely hydraulic valve arrangement that uses hydraulic pressure from the steering system itself to control the feedback suppression. This eliminates the need for additional electrical systems while maintaining the ability to switch between feedback and non-feedback modes.
Solution Approach 2:
The valve arrangement uses the hydraulic pressure already present in the steering system to activate itself, rather than requiring external electrical activation. The hydraulic pressure from the steering motor or steering unit automatically controls the valve state, making the system self-regulating.
2Ease of operation
If feedback suppression is prioritized, then steering effort is reduced, but the steering unit may not always be able to act on the steering motor
Solution Approach 1:
The valve arrangement is designed to be dynamically controllable through hydraulic pressure, allowing the system to switch between feedback suppression and feedback transmission modes. The pretensioning device ensures the valve starts in a defined state, while hydraulic pressure can override this to activate the steering unit when needed.
Solution Approach 2:
The pretensioning device pre-sets the valve in a closed state to prevent feedback suppression by default, ensuring that the steering unit can always act on the steering motor. Hydraulic pressure must actively overcome this pretensioning to activate feedback suppression, giving priority to steering control.
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
Enables simple and efficient control of feedback behavior, ensuring the steering unit can always act on the steering motor, maintaining symmetrical steering and feedback behavior, and preventing unwanted movement caused by the steering motor, while avoiding the need for additional electrical components.
Implementation Method 1
the valve arrangement can also be opened by a pressure from the steering unit
Implementation Method 2
the valve arrangement with hydraulic control inlet
Data Source
AI summary
The invention concerns a hydraulic steering (1) with a steering unit (2) with feedback behavior, a steering motor (8) connected to the steering unit (2) via working pipes (L, R), a steering member (6) and a feedback suppression device (9), which is located in at least one working pipe (L, R). It is endeavored to change the feedback behavior of such a steering in a simple manner. For this purpose, the feedback suppression device (9) has a valve arrangement (10) with hydraulic control inlet (C).