Hydraulic Control Valve Regeneration Paths for Low-Back-Pressure Actuation
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Solution Overview
Problem
Existing hydraulic systems for working machines, such as skid-steer loaders, face challenges in regenerating operation fluid when back pressure downstream of the control valve is low, leading to reduced operation speed of hydraulic actuators.
Innovation Solution
A hydraulic system with a control valve that includes a first supply path, a regeneration path, and a branched path. The control valve is configured to switch between positions for contracting and extending the hydraulic actuator, allowing operation fluid to be regenerated and supplied to outside the control valve, enhancing fluid regeneration and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conventional hydraulic system relies on back pressure downstream of the control valve to regenerate operation fluid, then fluid regeneration can occur under high back pressure conditions, but operation speed reduces when back pressure is low or insufficient
Solution Approach 1:
The control valve is divided into multiple independent flow paths: a first flow path for normal operation, a second flow path for fluid regeneration, and a third flow path for direct connection. This segmentation allows the system to selectively activate different paths based on back pressure conditions, ensuring both high-speed operation and reliable fluid regeneration
Solution Approach 2:
A third flow path acts as an intermediary direct connection between the upstream and downstream sides of the control valve. This intermediary path bypasses the need for back pressure-driven regeneration, providing a reliable alternative route for operation fluid flow when back pressure is insufficient
2Productivity
If the control valve uses a single flow path for operation fluid, then the structure is simple, but the system cannot simultaneously achieve quick operation and effective fluid regeneration under varying back pressure conditions
Solution Approach 1:
The control valve incorporates dynamic flow path selection capability, where the third flow path can be selectively activated or deactivated based on system conditions. This dynamic configuration allows the valve to adapt between single-path simplicity and multi-path functionality, optimizing both speed and regeneration performance
Solution Approach 2:
The control valve is designed with multi-functionality, where the same valve body houses multiple flow paths that serve different purposes: normal operation, fluid regeneration, and direct bypass. This universal design allows a single component to fulfill multiple functions, reducing the need for additional separate devices
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
The proposed hydraulic system facilitates quick operation of hydraulic actuators by effectively regenerating operation fluid even at low back pressures, thereby improving the overall efficiency and speed of hydraulic operations.
Implementation Method 1
a hydraulic pump that outputs operation fluid; a first control valve having an input port into which operation fluid is supplied
Implementation Method 2
The control valve includes a first supply path to guide the operation fluid toward the hydraulic actuator, a regeneration path to guide the operation fluid having been returned to the control valve from the hydraulic actuator, to the first supply path, and a branched path that branches from the regeneration path and supplies operation fluid to outside of the control valve
Data Source
AI summary
A hydraulic system for a working machine includes a hydraulic actuator configured to be operated by operation fluid, a control valve connected to the hydraulic actuator, and a communication fluid line for fluid communication between the hydraulic actuator and the control valve. The control valve includes a first supply path to guide the operation fluid toward the hydraulic actuator; a regeneration path to guide the operation fluid having been returned to the control valve from the hydraulic actuator, to the first supply path; and a branched path that branches from the regeneration path and supplies operation fluid to outside of the control valve.