Hydraulic Return Flow Layout for Stable Multi-Actuator Operation
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Solution Overview
Problem
Existing hydraulic systems for working machines face challenges in efficiently controlling and operating hydraulic actuators, particularly when multiple actuators are used simultaneously, leading to reduced operability and inconsistent operation feelings due to differences in return fluid supply and pressure management.
Innovation Solution
The hydraulic system incorporates a control valve configuration with multiple fluid tubes and throttles, allowing for independent operation of hydraulic actuators by managing return fluid flow and pressure through a network of fluid tubes and throttles, ensuring consistent operation regardless of actuator position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If return fluid from the first hydraulic device is directly supplied to the second control valve, then the system structure is simple, but the operation feeling becomes inconsistent when multiple actuators are used simultaneously
Solution Approach 1:
The return fluid path is segmented into multiple independent fluid tubes (first return fluid tube, second return fluid tube) that can be independently controlled. Each tube has its own throttle valve, allowing separate adjustment of return fluid flow to different control valves, thereby achieving consistent operation feeling for multiple actuators simultaneously
Solution Approach 2:
Throttle valves are introduced in each return fluid tube to dynamically adjust the flow resistance and return fluid supply amount. This dynamic adjustment capability allows the system to adapt to different operating conditions and maintain consistent operation feeling regardless of which actuators are in use
2Ease of operation
If multiple actuators are operated simultaneously with shared return fluid supply, then the system is compact, but operability is reduced due to pressure fluctuations
Solution Approach 1:
The return fluid supply system is divided into separate channels with individual throttle valves for each control valve. This segmentation allows independent pressure and flow control for each actuator, preventing pressure fluctuations from affecting other actuators when operated simultaneously
Solution Approach 2:
Throttle valves act as intermediary elements between the hydraulic pump and control valves, regulating return fluid flow and pressure. These intermediaries buffer pressure variations and ensure stable operation of multiple actuators simultaneously
3Productivity
If return fluid flow is not independently controlled for each actuator, then the system structure is simple, but operation efficiency decreases due to pressure losses
Solution Approach 1:
Throttle valves are installed in return fluid tubes to enable dynamic adjustment of flow resistance. This allows optimization of return fluid flow for each actuator based on its specific requirements, improving overall system efficiency while maintaining a relatively simple valve configuration
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 enhances the operability of hydraulic actuators by maintaining consistent operation feelings during simultaneous use, improving the efficiency and stability of hydraulic system operations.
Implementation Method 1
a throttle disposed on the branching fluid tube
Implementation Method 2
a setting portion disposed on the discharge fluid tube and configured to increase a pressure in the discharge fluid tube
Data Source
AI summary
A hydraulic system includes a hydraulic pump to output an operation fluid, first and second hydraulic devices to be operated by the operation fluid, first and second control valves to control the first and second hydraulic device, respectively, first and second communication tubes connecting the first hydraulic device to the first control valve, a supply fluid tube connecting the first control valve to the second control valve, the supply fluid tube being configured to supply the return fluid to the second control valve, first and second connection fluid tubes disposed on the first control valve, a discharge fluid tube connected to the first control valve, first and second branching fluid tubes branched from the first and second connection fluid tubes, respectively, first and second throttles disposed on the first and second branching fluid tubes, respectively, the second throttle being smaller than the first throttle.