Strength analysis of the polyoxymethylene cycloidal gears of the gerotor pump

Stryczek, J.; Bednarczyk, S.; Biernacki, Krzysztof

doi:10.1016/j.acme.2013.12.005

Cited by 44 publications

(53 citation statements)

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“…In the papers 25,29,30 results of the theoretical and practical research on the gerotor pump featuring a polyoxymethylene (POM) gear system have been presented. It enabled the practical verification of the strength models for the cycloidal gears made of polyoxymethylene, which had been described in the previous work.…”

Section: Introductionmentioning

confidence: 99%

“…It enabled the practical verification of the strength models for the cycloidal gears made of polyoxymethylene, which had been described in the previous work. 25,29 The practical research showed that a gerotor pump with such gears can work up to the value of working pressure p=6MPa. 30 In order to take the next step in the development of the gerotor machines, it is necessary to present design solutions for the cycloidal gears made of plastics, which will enable their operation at higher values of working pressure p. The solutions ought to be focused both on the material modifications and on the changes in the gear design Therefore, it is necessary to introduce modifications in the cycloidal gears' design in order to widen the range of operational parameters for the gears.…”

Section: Introductionmentioning

confidence: 99%

“…wroc.pl). 29,30 As a building material for the manufacturing of the gear system, polyoxymethylene (POM) was selected for its strength and processability. At those parameters, it shows low static friction coefficient and low adhesion.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the material and design modifications influence on strength of the cycloidal gear system

Biernacki

2015

Int. J. Precis. Eng. Manuf.

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The working unit of the hydraulic gerotor machine is a system of cycloidal gears. In the paper, ways of increasing the load-carrying capacity of the plastic cycloidal gears have been presented. The objective has been achieved through of structural and material modifications. The modifications were introduced while making the numerical models of the cycloidal gear system. The fundamental feature of the modifications is the combination of a plastic and a steel core in the design of the cycloidal gear system. While examining the system, the influence of the plastic-steel combination on the stress and deformation distributions in the operation of the cycloidal gears was verified. The numerical analysis was conducted using the finite elements method. The results of the analysis show that the introduction of the modifications strengthens the cycloidal gear system. Therefore, the conclusion that a system can work in the fluid power gerotor machines dedicated to operating at higher working pressure p seems justified. A result of the analysis is a presentation of solutions which will enable the strengthening and a higher load-carrying capacity of the gear system. Another finding of the research was determination of the maximum value of working pressure p at which the hydraulic gerotor machines with the modified cycloidal gears can operate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of the material and design modifications influence on strength of the cycloidal gear system

Biernacki

2015

Int. J. Precis. Eng. Manuf.

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“…Based on the analysis of the mini trochoidal-gear unit, working operation, and expertise of Stryczek et al [31], the decision of choosing as polymer composite material the pure polyoxymethylene (POM) is grounded on the following characteristics: high strength and rigidity, its accessibility on the market, low price, and among other things, its handling by means of the injection molding; summarizing, its average characteristics and qualities are presented in Table 2. The mini trochoidal-gear POM set has been manufactured by the Fluid Power Research Group at Wrocław University of Technology, and it is shown in Figure 4.…”

Section: Model Of the Mini Trochoidal-gear Unitmentioning

confidence: 99%

Magnet-Sleeve-Sealed Mini Trochoidal-Gear Pump Prototype with Polymer Composite Gear

et al. 2017

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Abstract:The trochoidal-gear technology has been growing in groundbreaking fields. Forthcoming applications are demanding to this technology a step forward in the conceiving stage of positive displacement machines. The compendium of the qualities and the inherent characteristics of trochoidal-gear technology, especially towards the gerotor pump, together with scale/size factor and magnetic-driven transmission has led to the idea of a magnet-sleeve-sealed variable flow mini trochoidal-gear pump. From its original concept, to the last phase of the design development, the proof of concept, this new product will intend to overcome problems such as noise, vibration, maintenance, materials, and dimensions. The paper aims to show the technological path followed from the concept, design, and model, to the manufacture of the first prototype, where the theoretical and numerical approaches are not always directly reflected in the prototype performance results. Early in the design process, from a standard-commercial sintered metal mini trochoidal-gear unit, fundamental characteristics and dimensional limitations have been evaluated becoming the strategic parameters that led to its configuration. The main technical challenge to confront is being sealed with non-exterior driveshaft, ensuring that the whole interior is filled and wetted with working fluid and helping the hydrodynamic film formation, the pumping effect, and the heat dissipation. Subsequently, the mini pump architecture, embodiment, methodology, materials, and manufacture are presented. The trend of applications of polymer composite materials and their benefits wanted to be examined with this new mini pump prototype, and a pure polyoxymethylene mini trochoidal-gear set has been designed and manufactured. Finally, both the sintered and the polymer trochoidal-gear units have been experimentally tested in an in-house full-instrumented mini test bench. Although the main goal of the presented work is the development of a new mini trochoidal-gear pump prototype rather than a numerical study, the results have been compared with numerical simulation. Subsequently, the prototype of the mini trochoidal-gear pump is a feasible proof of concept supported by functional indexes and the experimental results.

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“…They have been widely applied in machinery, automotive, appliance, architecture, chemical industry and other fields [4,5]. However, owing to relatively expensive price, most engineering plastics are often fabricated as some smaller components.…”

Section: Introductionmentioning

confidence: 99%

Design of Special Plastic Bearings and Their Application in Renewable Energy Conversion System

Dong¹,

Zhu²,

Zhang³

et al. 2015

TOMSJ

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Abstract:To improve the operational reliability of renewable energy conversion system, high-performance polymers and engineering plastics are used to make some parts and components of the energy conversion device, especially in the marine renewable energy generation field. In this article, special plastic bearings based on the material of polyoxymethylene (POM) were designed and applied in the power generation device of both tidal current energy and island wind energy. The properties of POM were analyzed, and the load of a POM ball was tested. Special structures of the plastic bearings were designed to meet the requirements of pressure resistance and to reduce the friction. These plastic bearings had been used in the prototypes of 20 kW tidal current turbine generation device and 15 kW island wind turbine generation device. According to the prototypes' operation, the results indicate that these plastic bearings work well and are very suitable for the application in renewable energy conversion system. By optimizing the structure, such plastic bearings would be generalized and applied in the renewable energy generation device with a higher power level.

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Strength analysis of the polyoxymethylene cycloidal gears of the gerotor pump

Cited by 44 publications

References 1 publication

Analysis of the material and design modifications influence on strength of the cycloidal gear system

Analysis of the material and design modifications influence on strength of the cycloidal gear system

Magnet-Sleeve-Sealed Mini Trochoidal-Gear Pump Prototype with Polymer Composite Gear

Design of Special Plastic Bearings and Their Application in Renewable Energy Conversion System

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