Hydraulic Steering Valve Segmentation for Mode Switching
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Solution Overview
Problem
Existing hydraulic steering devices face difficulties in adjusting steering behavior between reaction and non-reaction modes, leading to varying pressure losses and complex structural requirements, which can result in unpredictable steering and increased production costs.
Innovation Solution
Designing the first path as the main path for steering operation and the second path as an auxiliary path for reaction mode, with a 4/2-way valve used to control the auxiliary path, ensuring consistent flow conditions in both modes by keeping auxiliary paths small and only serving as auxiliary openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two parallel paths are provided for each direction of rotation with different cross sections, then both reaction and non-reaction modes can be achieved, but the configuration of opening characteristics becomes very difficult and structure becomes complex
Solution Approach 1:
The rotary slide control valve is divided into two separate functional components: a first rotary slide control valve for non-reaction mode with a first control bore, and a second rotary slide control valve for reaction mode with a second control bore. This segmentation allows each valve to be optimized independently for its specific function, simplifying the overall structure while maintaining versatility.
Solution Approach 2:
The housing is designed to accommodate both the first and second rotary slide control valves, allowing a single housing structure to support multiple steering modes. The housing serves as a universal platform that integrates both reaction and non-reaction control functions without requiring separate structural systems.
2Device complexity
If the first path is designed as main path and second path as auxiliary path, then structure is simplified, but pressure losses differ significantly between modes leading to unpredictable steering behavior
Solution Approach 1:
The first control bore is specifically designed with optimized dimensions and positioning to serve as the main flow path for non-reaction mode, while the second control bore is designed with different dimensions suitable for reaction mode. Each control bore has local quality characteristics (cross-sectional area, shape, position) optimized for its specific steering mode, ensuring predictable pressure characteristics in each mode.
3Adaptability or versatility
If shut-off valves are provided for each direction of rotation to switch between modes, then mode switching is possible, but production costs increase significantly
Solution Approach 1:
The first and second rotary slide control valves are integrated into a single housing structure, merging what could have been separate valve assemblies into one unified component. This combination reduces the number of separate parts that need to be manufactured and assembled, thereby reducing production costs while maintaining the ability to switch between reaction and non-reaction modes.
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 configuration simplifies the steering device structure, provides improved usage properties by maintaining consistent steering conditions in both reaction and non-reaction modes, reducing the risk of unpredictable steering and production costs.
Implementation Method 1
hydraulic steering device which consists of a rotary slide control valve and a metering pump
Implementation Method 2
the rotary slide control valve between the metering pump and the steering cylinder has two parallel oil flow paths in each case
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The device (1) has a rotary slide control valve (2) comprising two parallel paths (5, 5', 8, 8') between a dosing pump and a steering cylinder. The paths (5, 5') are closed in a neutral position, and the paths (8, 8') are locked up for change between a reaction operation and a non-reaction operation. The paths (5, 5') are designed as a main path for steering operation, and the lockable paths (5') are designed as an auxiliary path for the reaction operation in the neutral position. Control openings for the paths (8, 8') have smaller cross-section than control openings for the paths (5, 5').