Analysis of the Hydrodynamic Lubrication Characteristics of the External Return Spherical Bearing Pair of an Axial Piston Pump/Motor

Deng, Hongbin; Wang, Lei; Guo, Yongcun; Yu, Zeting; Wang, Chuanli

doi:10.1155/2020/4902927

Cited by 5 publications

(1 citation statement)

References 14 publications

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“…Qing et al proposed a dynamic leakage model of bent-axis piston pump based on elastohydrodynamic lubrication theory, which is used to present the leakage characteristics of bent-axis piston pump 14. Deng et al analyzed the hydrodynamic lubrication characteristics of the external return spherical bearing pair of an axial piston pump/motor 15. Zhang et al established a fluid thermal structure coupling model of piston pair of axial piston pump, then built an experimental platform to measure the oil film characteristic data 16.…”

Section: Introductionmentioning

confidence: 99%

Lubrication and leakage characteristic research of aviation plunger pump considering plunger deflection

Yuanying,

Bojian,

Qinxin

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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Aiming at the crucial issues of serious friction, wear and large leakage in the key friction pair on the aviation plunger pump, the influence factors of pressure and shear flow are introduced to correct the Reynolds governing equation of the clearance flow, the oil film thickness equation considering the deflection of the plunger was established, and the lubrication and leakage characteristics of the plunger/cylinder pair are analyzed using finite element method, and the following conclusions are obtained: the inclination angle of the plunger has a significant influence on the lubrication characteristics of the plunger pair, the maximum oil film pressure of the tilted plunger is significantly greater than that of the non-tilted plunger, a transition from elastohydrodynamic lubrication to mixed lubrication occurs in the plunger/cylinder pair at an inclination angle of 0.00015°. When the inclination angle is 0.00025°, the maximum oil film pressure is about 14 times than that without inclination, and the minimum oil film thickness when the plunger is deflected is significantly smaller than that without inclination. As the pressure difference gradually increases, the leakage ratio of a single plunger/cylinder pair mostly shows an approximate linear increase trend. When the contact length is 17 mm, the leakage amount is the largest and the slope of the varied curve is the steepest, when the unilateral clearance increases above 3 µm, the leakage ratio increases significantly. The research can provide references for the plunger/cylinder pair precise theoretical design and the instability of the core rotating components of aviation plunger pumps.

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Section: Introductionmentioning

confidence: 99%

Lubrication and leakage characteristic research of aviation plunger pump considering plunger deflection

Yuanying,

Bojian,

Qinxin

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

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Lubrication characteristics of external return spherical hinge pair of axial piston pump or motor under combined action of inclination and offset distance

Wang

Deng

Guo

et al. 2021

J. Cent. South Univ.

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External return mechanism is a mechanical structure applied to axial piston pumps. To study its lubrication characteristics, the Reynolds equation applied to an external return spherical hinge pair was deduced based on the vector equation of relative-motion velocity of the external return spherical hinge pair under the influence of external swash plate inclination and offset distance. The results show that the total friction, axial leakage flow, and maximum value of the maximum oil-film pressure increase with increasing pump-shaft speed and decrease with increasing offset distance in one working cycle when the external-swash-plate inclination is constant. However, the varying offset distance has little effect on the axial leakage flow. The maximum value of the maximum oil-film pressure decreases with increasing external-swash-plate inclination and the total leakage flow increases with increasing external-swash-plate inclination in one working cycle when the offset distance is constant. It can be seen that the abovementioned parameters are important factors that affect the lubrication characteristics of external return spherical hinge pairs. Therefore, the complex effects of different coupling parameters should be comprehensively considered in the design of the external return mechanism.

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Modeling and analysis of the leakage performance of the spherical valve plate pair in axial piston pumps

Liu

et al. 2023

Engineering Science and Technology, an International Journal

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Analysis of the Hydrodynamic Lubrication Characteristics of the External Return Spherical Bearing Pair of an Axial Piston Pump/Motor

Cited by 5 publications

References 14 publications

Lubrication and leakage characteristic research of aviation plunger pump considering plunger deflection

Lubrication and leakage characteristic research of aviation plunger pump considering plunger deflection

Lubrication characteristics of external return spherical hinge pair of axial piston pump or motor under combined action of inclination and offset distance

Modeling and analysis of the leakage performance of the spherical valve plate pair in axial piston pumps

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