Construction Machine Drive Device Hydraulic Circuit Segmentation
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Solution Overview
Problem
The existing drive devices for construction machines experience hydraulic energy loss and degraded fuel efficiency due to pressure loss when high-pressure working fluid is supplied to bucket and arm cylinders, and low-pressure fluid is used for the boom cylinder, leading to inefficiencies in fluid distribution and operability.
Innovation Solution
A drive device with a hydraulic circuit that includes separate passages and operation valves for each cylinder, allowing the first hydraulic pump to supply high-pressure fluid to the bucket and arm cylinders and the second hydraulic pump to supply low-pressure fluid to the boom cylinder, minimizing pressure loss by avoiding shared passages and using distinct fluid paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the first hydraulic pump supplies high-pressure working fluid to both bucket cylinder and arm cylinder through a shared passage, then the bucket and arm cylinders receive high-pressure fluid, but pressure loss increases and hydraulic energy loss occurs
Solution Approach 1:
The patent divides the hydraulic circuit into separate passages for different cylinders. The first pump passage supplies high-pressure working fluid to the bucket cylinder, while the second pump passage supplies working fluid to the arm cylinder and boom cylinder separately. This segmentation eliminates the pressure loss that would occur in a shared passage configuration.
Solution Approach 2:
The patent applies different pressure levels to different cylinders based on their specific requirements. The bucket cylinder receives high-pressure working fluid from the first hydraulic pump, while the arm and boom cylinders receive working fluid through separate passages. This local quality approach optimizes pressure distribution to match the actual load requirements of each cylinder.
2Productivity
If the first hydraulic pump and second hydraulic pump are in merged state, then working fluid from both pumps is merged and distributed to hydraulic cylinders, but the flow rate distribution becomes unbalanced and operability degrades
Solution Approach 1:
The patent segments the hydraulic circuit into distinct pathways: the first pump passage connects the first hydraulic pump directly to the bucket cylinder, while the second pump passage connects the second hydraulic pump to the arm and boom cylinders. This segmentation ensures balanced flow rate distribution and prevents the operability degradation that occurs in merged state configurations.
3Stress or pressure
If high-pressure working fluid is supplied from the second hydraulic pump to both bucket cylinder and arm cylinder through a shared passage, then the cylinders receive high-pressure fluid, but pressure loss increases and hydraulic energy loss occurs
Solution Approach 1:
The patent implements separate pump passages where the first hydraulic pump has its own dedicated passage to the bucket cylinder, and the second hydraulic pump has its own dedicated passage to the arm and boom cylinders. This eliminates the pressure loss and energy waste associated with supplying high-pressure fluid through a shared passage.
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 reduces hydraulic energy loss and maintains fuel efficiency by optimizing fluid pressure distribution, enhancing the operability of the construction machine's working implement.
Implementation Method 1
the pressure loss of the working fluid increases, and hence hydraulic energy loss occurs
Data Source
AI summary
A drive device of a construction machine includes a pump passage connected to a hydraulic pump, first and second supply passages connected to the pump passage, first and second passages connected to the first supply passage, third and fourth passages connected to the second supply passage, a first valve connected to the first and third passages, a second valve connected to the second and fourth passages, a first bucket passage connecting the first passage to a cap-side space of the bucket cylinder through the first valve, a second bucket passage connecting the third passage to a rod-side space of the bucket cylinder through the first valve, a first arm passage connecting the second passage to a rod-side space of an arm cylinder through the second valve, and a second arm passage connecting the fourth passage to a cap-side space of the arm cylinder through the second valve.