Hydraulic Steering Choke for Priority Supply
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Solution Overview
Problem
Hydraulic steering systems face energy and performance losses due to the need for high spring rigidity to maintain priority supply at high steering speeds, which results in inefficient energy use when not actuated.
Innovation Solution
Incorporating an adjustable input choke and a second adjustable load signal choke with opposite closing characteristics, allowing for a speed-dependent load signal that increases regulating pressure difference during faster steering movements, enabling more efficient priority supply to the steering circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a regulating spring with relatively high spring rigidity is used to maintain priority supply at high steering speeds, then the steering circuit priority supply is improved, but energy losses increase in the neutral position
Solution Approach 1:
The patent applies dynamics by making the choke opening adjustable rather than fixed. The choke opening can be dynamically adapted to different operating conditions - closed or restricted during neutral operation to reduce energy losses, and opened during steering operations to ensure priority supply to the steering circuit. This dynamic adjustment resolves the contradiction between maintaining reliable priority supply and minimizing energy losses.
Solution Approach 2:
The patent changes the parameter of choke opening from a fixed state to an adjustable variable. By modifying the choke opening parameter based on operational requirements (closed during neutral, open during steering), the system achieves both reduced energy losses in neutral position and maintained priority supply during steering operations.
2Device complexity
If a fixed choke opening is used in the load signal path, then the system structure is simple, but the pressure level cannot be optimized for different steering speeds
Solution Approach 1:
The patent transforms the static choke opening into a dynamic, adjustable parameter. The adjustable choke opening allows the system to adapt to different steering speeds and operational conditions, optimizing pressure levels and flow distribution for both slow and fast steering movements, thereby improving productivity without excessive complexity.
Solution Approach 2:
The adjustable choke opening serves multiple functions: it restricts flow during neutral operation to reduce energy losses, opens during steering to ensure priority supply, and can be modulated to optimize performance across different steering speeds. This multi-functionality addresses the productivity requirement while keeping the structural addition minimal.
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 faster steering movements and direction changes in mobile systems by optimizing pressure levels at high speeds, reducing energy losses and improving the overall energy balance of the hydraulic system.
Implementation Method 1
an adjustable input choke (20) which is connected to the flow dividing valve (3) via an inflow connection (6) of the steering facility (7), a parallel circuit (22, 24) is arranged between the load signal connection (13) and downstream of the choke (26), an adjustable load signal choke (27) in the parallel circuit (22, 24)
Implementation Method 2
the load signal connection (13) is further connected via a further adjustable load signal choke (27) to the return flow connection (12) of the steering facility (7)
Data Source
AI summary
The invention relates to a hydraulic steering facility for mobile systems, with a steering circuit for a steering facility and a working circuit for a working hydraulic system, whereby the steering circuit and the working hydraulic system are connected to a supply pump via a shared flow dividing valve and the flow dividing valve is connected to a load signal connection of the steering device. It is provided that the steering facility has an adjustable input choke that is connected via an inflow connection of the steering facility to the flow dividing valve, between the load signal connection and downstream of the input choke, a parallel circuit consisting of a choke and an adjustable second load signal choke is arranged, and the load signal connection is further connected via an adjustable first load signal choke to a return flow connection of the steering facility.