Flow fluctuation abatement of high-order elliptical gear pump by external noncircular gear drive

Liu, Dawei; Ba, Yanbo; Tingzhi, Ren

doi:10.1016/j.mechmachtheory.2019.01.011

Cited by 30 publications

(14 citation statements)

References 17 publications

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“…When the driving gear rotates for one cycle, the driven gear will have multiple symmetrical rotation cycles. Different order and eccentricity of them will change the kinematic parameters and transmission characteristics of high-order elliptical gears, which can be used in gear pumps to reduce the flow ripples 8 .…”

Section: List Of Symbols Amentioning

confidence: 99%

Design of piecewise deformed elliptical gear with closed pitch curve and its conjugate pair

Liu

et al. 2022

Sci Rep

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The family of elliptical gears with closed pitch curves includes elliptical gears and deformed elliptical gears. Elliptical gears are not only the most widely used non-circular gears but also the research hotspot in the field of non-uniform transmission. However, adjusting the shape of its pitch curve is difficult, which seriously restricts its popularization. This article proposes a piecewise deformed elliptical gear with a closed pitch curve, which realizes the unity of all kinds of elliptical gears in the mathematical model, makes the shape of the pitch curve and gear ratio easier to adjust, and expands the connotation and application scope of the family of elliptical gears. Moreover, the design approach of transmission with piecewise deformed elliptical gear was studied, and the inspection method of transmission performance was provided. The internal relationship between piecewise deformed elliptical gears and the family of elliptical gears was then analyzed. Finally, the method of computer-aided design (CAD) system developed was also provided. Additionally, a case was provided to verify the above theories. The designed conjugate pair can realize a correct meshing and adjust the gear ratio more flexibly, laying a theoretical foundation to expand the application field of non-uniform transmission.

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Section: List Of Symbols Amentioning

confidence: 99%

Design of piecewise deformed elliptical gear with closed pitch curve and its conjugate pair

Liu

et al. 2022

Sci Rep

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“…Currently, there are a large number of papers devoted to geometric and kinematic analysis, design and practical application of gears by non-circular gears [3][4][5][6][7][8][9]. For example, there are proposed: chain drives with variable ratio for bicycles [3]; a mechanical device containing a Maltese cross mechanism and a gearing to achieve intermittent motion [4]; the gear trains used for velocity variation and function generation [5]; constructions of non-circular gears as a part of rotor hydraulic machines [6] and highperformance pumps [7]; a knee motion assist device for biomechatronic exoskeleton having grooved cams and noncircular wheels [8]; single planetary non-circular gears with one internal and one external gear for bicycles with high efficiency [9]. It was shown in [10][11][12][13][14] that planetary gears with non-circular wheels allow to change the sign of the transfer function and, therefore, provide different types of motion, for example, intermittent motion [10][11][12] or rotationally reciprocating motion [13,14].…”

Section: Introductionmentioning

confidence: 99%

Force analysis of the two-satellite planetary mechanism with elliptical gears

Prikhodko

2021

Mechanics and Mechanical Engineering

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Non-circular gears can be used in modern machines and mechanisms for the implementation of various types of motion and have high strength and compactness compared to linkage mechanisms. This article presents the force analysis of non-circular gear on the example of the planetary mechanism with elliptical gears, providing the rotationally reciprocating motion of the impeller of the stirred tank. Based on the calculation schemes of the links, kinetostatic balance equations for each link of the mechanism are compiled and solved. Reaction forces in kinematic pairs and balancing moment on the input shaft of the mechanism are found. The results can be used in the synthesis and analysis of various machines with the proposed kinematic scheme of the mechanism.

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“…Non-circular gears have been widely applied in some mechanisms and mechanical devices because of their special motion output. Typical applications of non-circular gears include gear pump (Liu et al, 2019), indexing mechanisms (Zheng et al, 2016), function generators (Ottaviano et al, 2008;Litvin et al, 2008), wearable robot (Terada et al, 2012) and etc.…”

Section: Introductionmentioning

confidence: 99%

A miniature non-circular line gear with pure-rolling contact

Xiao

Chen

Xie

et al. 2021

JAMDSM

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The design of pure-rolling gear has always been a subject of intense research, because in some working conditions, such as dry friction, pure-rolling gear has higher transmission efficiency and less possibility of transmission failure. Non-circular gears have played an important role in mechanical devices and robots. To date, there is no effective method to design a pure-rolling non-circular gear with relatively small number of teeth. Based on the space curve meshing theory, a pure-rolling non-circular Line Gear (PNLG) mechanism was presented in this paper. Firstly, the fundamental design method of the PNLG was proposed, which included the derivation of the contact curves, the obtainment of the teeth number and the solution of the rotating angle function. And, the rotating angle function was selected as a segmental quartic curve to ensure the dynamic stability in the meshing process. Afterwards, a pair of PNLG was designed for finite element analysis (FEA) and kinematics experiment. Finally, prototypes of PNLG pair were manufactured by using of 3D printing, and transmission ratios were measured on the test rig. The simulation results and experimental results indicate that the devised PNLG is feasible, that is, the PNLG can smoothly output the preset rotating angle and angular velocity. The designed PNLG mechanism might be used in some special cases, such as the occasion without lubrication and miniature devices.

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Flow fluctuation abatement of high-order elliptical gear pump by external noncircular gear drive

Cited by 30 publications

References 17 publications

Design of piecewise deformed elliptical gear with closed pitch curve and its conjugate pair

Design of piecewise deformed elliptical gear with closed pitch curve and its conjugate pair

Force analysis of the two-satellite planetary mechanism with elliptical gears

A miniature non-circular line gear with pure-rolling contact

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