Abstract
An irregular performance of a mechanical-type constant power regulator is considered. In order to find the cause of an irregular discharge flow at the cut-off pressure area, modeling and numerical simulations are performed to observe dynamic behavior of internal parts of the constant power regulator system for a swashplate-type axial piston pump. The commercial numerical simulation software AMESim is applied to model the mechanical-type regulator with hydraulic pump and simulate the performance of it. The validity of the simulation model of the constant power regulator system is verified by comparing simulation results with experiments. In order to find the cause of the irregular performance of the mechanical-type constant power regulator system, the behavior of main components such as the spool, sleeve, and counterbalance piston is investigated using computer simulation. The shape modification of the counterbalance piston is proposed to improve the undesirable performance of the mechanical-type constant power regulator. The performance improvement is verified by computer simulation using AMESim software.
Highlights
The pressure regulators of swashplate-type variable displacement axial piston pumps (VDAPP) control the swivel angle, which changes the amount of flow rate to hydraulic circuits
We proposed the rounded shape for the edge of the counterbalance piston
The constant power mechanical regulator with VDAPP has a problem of pulsation in the discharge flow rate at the cutoff area
Summary
The pressure regulators of swashplate-type variable displacement axial piston pumps (VDAPP) control the swivel angle, which changes the amount of flow rate to hydraulic circuits. We applied the constant power regulator to the VDAPP so that the angle of the swashplate is automatically decreased according to an increase of the load pressure. A new method to find out the cause of poor performance of the mechanical regulator system with VDAPP by using the commercial simulation software AMESim (Advanced Modeling Environment for Simulation of Engineering System, version 4.2, LMS, France) is proposed. The design parameters of each component can be applied to a nonlinear virtual model which is based on theoretical analysis by using AMESim software [5, 6] This approach is used to analyze the internal motion of the spool and sleeve in the regulator which cannot be measured in a real system.
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