Integrated Multi-Control Valve Unit Without Auxiliary Pump
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Solution Overview
Problem
In hydraulic systems of construction machines, the use of a separate auxiliary pump to supply primary pressure to solenoid proportional valves leads to unnecessary consumption of motive power, as the auxiliary pump continues to deliver hydraulic oil even when the main pump's flow rate is minimized.
Innovation Solution
A multi-control valve unit with a hydraulic pressure generator, including an electric motor and a pump, is integrated into the housing, allowing primary pressure to be supplied directly to solenoid proportional valves, eliminating the need for an auxiliary pump and enabling the electric motor to operate only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate auxiliary pump is used to supply primary pressure to solenoid proportional valves, then the valves can be reliably actuated, but the motive power consumption increases because the auxiliary pump operates continuously even when the main pump flow rate is minimized
Solution Approach 1:
The patent merges the auxiliary pump function into the main pump by equipping the main pump with a variable displacement mechanism. This allows the main pump to dynamically adjust its displacement and supply primary pressure to solenoid proportional valves only when necessary, eliminating the need for a separate continuously-operating auxiliary pump and reducing motive power consumption while maintaining reliable valve actuation.
2Reliability
If an auxiliary pump is added to the system, then primary pressure supply to solenoid proportional valves is ensured, but the device complexity and space requirements increase
Solution Approach 1:
The patent merges the auxiliary pump function into the main pump structure by equipping it with a variable displacement mechanism. This integration ensures primary pressure supply to solenoid proportional valves while reducing device complexity and eliminating the need for additional components, connections, and mounting space that would be required for a separate auxiliary pump.
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 the consumption of motive power by eliminating the need for an auxiliary pump and allows for reduced energy consumption by operating the electric motor only at necessary flow rates, thereby improving fuel efficiency and minimizing space requirements.
Implementation Method 1
the hydraulic pressure generator including an electric motor and a pump
Implementation Method 2
a pump... such that the hydraulic pressure generator is connected to the solenoid proportional valves
Data Source
AI summary
A multi-control valve unit includes a housing with built-in spools that are parallel to each other. The housing includes pilot chambers formed therein, the pilot chambers corresponding to both ends of the spools. Solenoid proportional valves are mounted to the housing, such that the solenoid proportional valves are connected to the respective pilot chambers. A hydraulic pressure generator is mounted to the housing, such that the hydraulic pressure generator is connected to the solenoid proportional valves. The hydraulic pressure generator includes an electric motor and a pump.