Integrated Gerotor Charge Pump for Hydraulic Circuit Pressure Balance
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Solution Overview
Problem
Hydraulic devices with closed circuits face challenges in maintaining pressurized fluid on the low pressure side, which affects their performance, as existing solutions do not efficiently provide pressurized fluid to the vacuum side.
Innovation Solution
The integration of a gerotor charge pump, centrifugal pump, or flex-impeller charge pump within the hydraulic circuit, which uses porting and hoses to connect and provide pressurized fluid to the low pressure side, utilizing mechanisms like rotor plates, wave springs, and mesh filters to enhance fluid transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a charge pump is connected to the hydraulic circuit through porting or hoses, then pressurized fluid can be provided to the low pressure side, but the device complexity increases
Solution Approach 1:
The charge pump is integrated directly into the hydraulic pump housing, merging two functions (main hydraulic pump and charge pump) into a single structural unit. This eliminates the need for separate porting or hoses to connect the charge pump to the hydraulic circuit, thereby reducing device complexity while maintaining the ability to provide pressurized fluid to the low pressure side
2Reliability
If existing charge pump solutions are used, then pressurized fluid can be provided to the low pressure side, but the pressure imbalance persists affecting performance
Solution Approach 1:
The charge pump is positioned and configured to directly receive fluid from the low pressure side and redistribute it, creating a feedback mechanism that actively balances pressure. The pump's output is directed back into the hydraulic circuit in a manner that compensates for pressure imbalances, ensuring optimal performance
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
These pumps effectively provide pressurized fluid to the low pressure side, improving the performance of hydraulic devices by maintaining a balanced hydraulic circuit, reducing pressure imbalances, and ensuring efficient operation.
Implementation Method 1
centrifugal pump
Data Source
AI summary
A charge pump design for a hydraulic drive apparatus such as a hydrostatic transmission, integrated hydrostatic transaxle or pump having a rotatable pump cylinder block mounted in a sump and connected to a hydraulic circuit by means of a center section or the like. A fluid gallery for charge fluid is in communication with the hydraulic circuit and the charge pump is mounted adjacent to and is driven by the pump cylinder block to provide hydraulic fluid from the sump to the fluid gallery. The charge pump can be of many different styles such as a gerotor, a centrifugal pump or a flexible impeller style.