Boom Hydraulic Circuit With Integrated Float Valve Regeneration
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Solution Overview
Problem
Existing hydraulic circuits for construction equipment lack energy efficiency when a boom is lowered, and their configuration becomes complex due to the need for additional components like float valves for floating functions.
Innovation Solution
A hydraulic circuit with a valve unit containing multiple control valves (first, second, third, and fourth) that manage oil flow between the boom cylinder, oil tank, accumulator, and assist motor, allowing for energy regeneration and simplifying the configuration by integrating the float valve within the valve unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a float valve is added to enable floating function, then the floating function is achieved, but the configuration becomes complicated and volume increases
Solution Approach 1:
The patent combines the float valve with the main control valve into a single integrated valve body. The float valve is positioned within the main control valve structure, sharing common components such as the valve body and hydraulic passages. This merging eliminates the need for separate float valve installation and reduces overall system complexity while maintaining both energy regeneration and floating functions.
Solution Approach 2:
The main control valve is designed to perform multiple functions: it serves as both the main control valve for hydraulic oil distribution and as the housing for the float valve. This multi-functionality allows the same component structure to provide both energy regeneration control and floating function control, reducing the total number of components needed in the system.
2Loss of energy
If energy regeneration is implemented by communicating large and small chambers, then energy efficiency improves, but the control system becomes more complex
Solution Approach 1:
The energy regeneration control function is merged into the main control valve by positioning the float valve within its structure. The float valve uses the hydraulic pressure differential between chambers to automatically control oil flow for energy regeneration, eliminating the need for separate energy regeneration control mechanisms while maintaining energy efficiency.
Solution Approach 2:
The float valve operates automatically based on hydraulic pressure conditions without requiring external control signals. When the boom is lowered, the pressure differential automatically opens the float valve to enable oil flow from the large chamber to the small chamber, achieving energy regeneration through self-actuation rather than complex controlled systems.
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 solution enables energy efficiency by regenerating and recovering return-oil when the boom is lowered and simplifies the equipment configuration, reducing complexity and potential costs.
Implementation Method 1
an accumulator (205) into which return-oil from the large chamber (100a) is recovered
Implementation Method 2
a gas bladder (205b) having an upper end open to the communication hole (205c)
Implementation Method 3
an assist motor (130) that generates hydraulic pressure in response to rotation performed in accordance with flow of oil from the accumulator (205)
Implementation Method 4
a boom cylinder (100) that controls up and down operation of a boom
Implementation Method 5
Hydraulic pressure of the main pump 2 is supplied to a main control valve 3 and is selectively supplied to a large chamber 4a or a small chamber 4b of a boom cylinder 4
Data Source
AI summary
Provided is a hydraulic circuit of construction equipment, including a boom cylinder for controlling ascending and descending movement of a boom, which includes a valve unit having a first control valve configured to control a large chamber of the boom cylinder to selectively communicate with a small chamber of the boom cylinder, a second control valve configured to control the large chamber to selectively communicate with an oil tank, a third control valve configured to control the large chamber to selectively communicate with an accumulator, and a fourth control valve configured to control a part of hydraulic oil flowing to the accumulator to selectively flow to an assist motor.