Parallel Hydraulic Pump Motors for Boom Energy Regeneration
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Solution Overview
Problem
The existing hydraulic drive devices require a large-sized hydraulic pump motor for regenerating the potential energy of a boom cylinder, leading to inefficiencies and increased size requirements.
Innovation Solution
A hydraulic drive device with multiple hydraulic pump motors connected in parallel, each connected to a directional control valve and an electric motor, allowing for simultaneous actuation of hydraulic actuators and reduced suction flow rates, thereby reducing the size of each pump motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single hydraulic pump motor is used for regeneration, then the entire working fluid can be suctioned, but the hydraulic pump motor size increases
Solution Approach 1:
The single hydraulic pump motor is divided into multiple smaller hydraulic pump motors (first, second, third, and fourth hydraulic pump motors). Each pump motor has its own suction port connected to the meter-out passage, allowing the system to handle the same total flow rate with smaller individual units, thus reducing the size requirement for each motor while maintaining regeneration capability.
2Volume of moving object
If multiple hydraulic pump motors are used, then the size of each pump motor is reduced, but the device complexity increases
Solution Approach 1:
Each hydraulic pump motor is equipped with its own electric motor and can independently function for both actuation and regeneration. The parallel configuration allows any combination of pump motors to operate together, providing flexibility and reducing the burden on individual components while managing system complexity through standardized modular units.
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 efficient regeneration of fluid energy as electrical energy while minimizing the size of the hydraulic pump motors, enhancing operational efficiency and compactness.
Implementation Method 1
the suction ports of the plurality of hydraulic pump motors are connected in parallel with the meter-out passage. Therefore, the fluid energy of the working fluid drained from the hydraulic cylinder can be regenerated as electrical energy by the plurality of hydraulic pump motors
Data Source
AI summary
This hydraulic drive device supplies and drains a working fluid to and from a hydraulic cylinder and includes: a plurality of hydraulic pump motors including suction ports and discharge ports; a plurality of electric motors respectively connected to the plurality of hydraulic pump motors; and a directional control valve that is connected to a meter-out passage and connects the hydraulic cylinder to the meter-out passage to drain the working fluid from the hydraulic cylinder to the meter-out passage. The suction ports of the plurality of hydraulic pump motors are connected in parallel with the meter-out passage.