Hydraulic Steering Feedback Suppression via Merged Shock Valve
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Solution Overview
Problem
Hydraulic steering systems used in tractors and self-propelled machines face challenges in switching between feedback and non-feedback modes, requiring a simple and efficient method to change steering behavior based on the environment, to prevent constant driver intervention and ensure smooth operation in different driving conditions.
Innovation Solution
A switchable feedback suppression device is integrated between the shock valve arrangement and the steering motor, allowing for the suppression of feedback behavior by controlling hydraulic fluid flow, which includes a valve arrangement with electrical or hydraulic activation, ensuring the steering unit can operate independently of feedback mode without additional housing or complex piping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a feedback suppression device is added to change steering behavior, then the adaptability to different driving environments is improved, but the device complexity increases
Solution Approach 1:
The feedback suppression device is integrated directly into the existing shock valve arrangement housing, merging two functional elements into a single housing structure. This eliminates the need for an additional separate valve housing and reduces the number of required connections and pipes, thereby improving adaptability while minimizing the increase in device complexity
Solution Approach 2:
The shock valve arrangement housing is designed to serve dual purposes: housing the traditional shock valve components and simultaneously accommodating the feedback suppression device. This multi-functional design allows the system to adapt to different steering requirements without adding separate dedicated housings for each function
2Device complexity
If the feedback suppression device is integrated into the steering unit housing, then the device complexity is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The feedback suppression device shares the shock valve arrangement housing with traditional steering components. By merging multiple functions into a single housing, the number of separate parts and assembly interfaces is reduced, which lowers overall device complexity while the housing is designed to accommodate all components with appropriate tolerance allocations
3Reliability
If the shock valve arrangement is positioned between the feedback suppression device and steering motor, then the reliability is improved by preventing cavitation, but the device complexity increases
Solution Approach 1:
The shock valve arrangement is integrated within the same housing that contains the feedback suppression device. This merging of functions into a single housing structure allows the shock valve to protect the steering motor from cavitation and excess pressure without requiring a separate valve housing, thus improving reliability while minimizing the increase in device complexity
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
This solution allows for seamless switching between feedback and non-feedback modes, preventing cavitation and excess pressure in the steering motor, reducing driver workload, and maintaining stable piping without the need for additional valve housings, ensuring efficient and reliable operation in various environments.
Implementation Method 1
the shock valve arrangement permits a replenishing of hydraulic fluid
Implementation Method 2
a negative pressure in the steering motor can be avoided, as the shock valve arrangement permits a replenishing of hydraulic fluid
Implementation Method 3
the shock valve arrangement also permits prevention of an excess pressure at the other connection of the steering motor
Implementation Method 4
A switchable feedback suppression device is integrated between the shock valve arrangement and the steering motor, allowing for the suppression of feedback behavior by controlling hydraulic fluid flow
Data Source
AI summary
The invention concerns a hydraulic steering (1) with a steering motor (8), a steering unit (2) with feedback behavior, a steering member activating the steering unit (2) and a shock valve arrangement (50) between the steering motor (8) and the steering unit (2). It is endeavored to enable changes of the feedback behavior in a simple manner. For this purpose it is ensured that a switchable feedback suppression device (9) is located at the side of the shock valve arrangement (50) facing away from the steering motor (8).