Switchable Load Reaction Valve for Hydraulic Steering Pressure Control

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Solution Overview

Problem

Existing hydraulic systems for steering systems lack a flexible mechanism to enable or disable load reaction feedback and electro-hydraulic steering simultaneously, which can lead to inefficiencies and potential component failure due to uncontrolled pressure.

Innovation Solution

A valve system that integrates a load reaction section and an electro-hydraulic switching section, allowing independent control of load reaction feedback and electro-hydraulic steering operation, using a multi-position valve or separate switch valves actuated by solenoids or pilot-operated solenoids to manage hydraulic fluid flow and feedback.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If load reaction feedback is enabled in hydraulic steering systems, then steering precision and operator control are improved, but system complexity and potential pressure-related component failure increase

Engineering Contradiction:

Improvesteering precisionVSAvoidcomponent failure risk

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent implements a dynamically switchable load reaction valve that can transition between enabled and disabled states based on operational conditions. This dynamic configuration allows the system to optimize steering precision when needed while preventing pressure-related failures by disabling load reaction feedback under problematic conditions, thus resolving the contradiction between precision and reliability

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If electro-hydraulic steering circuit is activated, then steering control flexibility is improved, but pressure buildup and potential system failure are worsened

Engineering Contradiction:

Improvesteering control flexibilityVSAvoidpressure buildup

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a load reaction valve as an intermediary component between the electro-hydraulic steering circuit and the fluid actuator. This valve acts as a pressure management mediator that can regulate fluid flow and prevent excessive pressure buildup while maintaining the flexibility benefits of electro-hydraulic control, thus resolving the contradiction between control flexibility and pressure-related harmful effects

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If both load reaction feedback and electro-hydraulic steering operate simultaneously, then overall steering performance is improved, but system complexity and control difficulty increase

Engineering Contradiction:

Improvesteering performanceVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the steering control system into distinct functional modules: an electro-hydraulic steering circuit, a fluid actuator, and a separately controllable load reaction valve. This segmentation allows each component to be controlled and optimized independently, reducing overall system complexity while maintaining high steering performance through coordinated operation of the segmented components

Inventive Principle:

Principle #1Segmentation

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 dynamic control of load reaction feedback and electro-hydraulic steering, preventing pressure-related failures and optimizing hydraulic system performance based on operational needs.

Implementation Method 1

Methodology Applied

Scientific EffectSolenoid: Solenoid

Implementation Method 2

Hydraulics typically refers to the use of relatively high density incompressible liquids (i.e. hydraulic fluid) to perform work.

Methodology Applied

Scientific EffectHydraulic: Hydraulic Press

Data Source

PatentEP3996971B1Steering system with switchable load reaction valve

Publication Date: 2026.03.18 FEMA CORP OF MICHIGAN

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Figure 3A

AI summary

A valve (400) for hydraulic parallel work systems (100) is provided. The valve (400) includes a first pair of ports (416, 416a-b), a second pair of ports (422, 422a-b), a first connection, and a second connection. The first connection is between the first pair of ports (416, 416a-b) when the valve (400) is in a load reaction-enabling state (LRQN). The first connection transmits a load reaction (402) from a load at a steering actuator (140) to a steering device of a hydrostatic steering circuit (200). The second connection is between the second pair of ports (422, 422a-b) when the valve (400) is in an electro-hydraulic steering enabling state. The second connection fluidly connects a fluid source (110) to an electro- hydraulic steering circuit (300).