Papers by Keyword: Planetary Gear

Abstract: Planetary transmissions used as speed amplifiers in wind/hydro conversion systems typically rely on the conventional concept of mechanism with one input and one output. This concept is found in the most of the high power wind turbines; however, the need to implement in the built environment smaller wind turbines with speed amplifiers led to new turbine concepts such as counter-rotating rotors and classical generator. The paper presents a comparative analysis of two wind turbines with one rotor and respectively two counter-rotating rotors, which contain identical electrical generators and the same type of mechanical amplifier used as a 1 DOF mechanism and differential one respectively. With the assumption of maintaining the same electrical generator running point for both wind turbines, the steady-state behaviour of the considered turbines is identified and a comparative kinematic and static performance analysis is performed, aiming at highlighting the impact on efficiency and on constructive design and development of the two turbines.

Abstract: Mechanical transmissions are frequently used in renewable energy systems (RES), either as speed reducers in solar tracking systems (e.g. worm drive, planetary gear), or as speed increasers in small hydropower converters or wind turbines. Most of them are conventional transmissions characterized by large overall dimensions and/or low efficiencies; therefore, new mechanical transmissions with higher performances are highly investigated. The paper presents the development of an innovative chain planetary transmission for hydro/wind applications. The speed increaser transmission requires a well-defined transmission ratio according to the application (3 – 5 for hydro, 6 – 30 for wind), good efficiency, relative simple and compact structure, easy maintenance, and low-cost. The final proposed solution overcomes some limits of the RES transmissions, significantly increasing the efficiency while decreasing the system size and eliminating the chain pre-stressing. The steps of the product design process applied for innovative generation of high performance mechanical transmissions are shown in the Part I. The proposed chain planetary transmission integrated into a micro hydropower application is analyzed in the Part II: virtual prototyping, experimental testing and optimization stages and results are detailed.

Abstract: Mechanical transmissions are frequently used in renewable energy systems (RES), either as speed reducers in solar tracking systems (e.g. worm drive, planetary gear), or as speed increasers in small hydropower converters or wind turbines. Most of them are conventional transmissions characterized by large overall dimensions and/or low efficiencies; therefore, new mechanical transmissions with higher performances are highly investigated. The paper presents the development of an innovative chain planetary transmission for hydro/wind applications. The speed increaser transmission requires a well-defined transmission ratio according to the application (3 – 5 for hydro, 6 – 30 for wind), good efficiency, relative simple and compact structure, easy maintenance, and low-cost. The final proposed solution overcomes some limits of the RES transmissions, significantly increasing the efficiency while decreasing the system size and eliminating the chain pre-stressing. The steps of the product design process applied for innovative generation of high performance mechanical transmissions are shown in the Part I. The proposed chain planetary transmission integrated into a micro hydropower application is analyzed in the Part II: virtual prototyping, physical testing and optimization stages and results are detailed.

Abstract: Misalignment on sun gear in planetary gear is easily occurred and it usually causes serious problem of work efficiency and lifetime with the change of planet load sharing. For study on the influence of sun gear misalignment on load sharing, multibody dynamics simulation is employed in this paper. First of all, 3D geometry model of planetary gear is built by Solidworks. Based on 3D model, multi-body dynamics model of planetary gear is built by MSC.ADAMS and calculate meshing forces between sun gear and planet gears with each type of sun gear misalignment which are angular, radial and axial type. Based on this meshing force result, load sharing factor is calculated and the results of influence of each misalignment type to load sharing factor is obtained. Finally, gear lifetime is estimated by AGMA gear fatigue strength estimation method with load sharing factor. According to the results, radial misalignment is the most influence to load sharing factor and gear lifetime.

Abstract: Aspects of the structural synthesis of planetary gears without excess communications are analyzed. The possibility of creation of self-established multisatellite planetary reducers, by addition in the structure of gear of the group of links with zero mobility is proved. The solution of the problem of an equal distribution of loading on satellites is given. Computing experiments in the program complex «T-Flex Dynamics» are carried out. The new scheme of the planetary gear is shown.

Abstract: The tracked combine agricultural machinery is a most complex in structure, high technology content, the manufacture technology of very strict requirements of product. Our crawlers combine 1/3 of the fault from the walking gear system in operation. This paper adopts the planetary wheel transmission, because it has the advantages of compact structure, small volume, large transmission ratio, torque / volume ratio, high efficiency, and high reliability, meet the structure and characteristics of the combine harvester. This technology can save the transmission assembly, avoid the fault of gearbox assembly; improve the combine harvester of paddy field through. Keywords: Mechanical design;Combine Harvester;Planetary Gear;Transmission Technology

Abstract: In view of the structure and running characteristics of gearbox of large and special crane, we have respectively carried out vibration test of fault and free-fault gearbox containing planetary gear in the work. With the help of Matlab engineering software, we can read and process the collected vibration signal of gearbox and draw the time-domain and frequency-domain graph. Through the comparative analysis of vibration information of gearboxes, we can determine the link between fault type and signal characteristic value, effectively realize the fault diagnosis of gearbox.

Abstract: This paper presents the dynamic modeling of a new variant of helical planetary gear proposed by the authors, generated by the Vaucanson`s planetary mechanism. This model can be apply successfully helping a robotic arm in motion. It is considered that the gear made connects between a motor and a pump, whose mechanical properties are known. Using Matlab-Simulink is setting the equations of motion and dynamic response, both in premise neglect friction and the premise of considering friction.

Abstract: The goal of the presented contribution is a comparison of two variants of differential mechanical planetary gearboxes. The designed variants of differential gearboxes are characterized by gear shifting under load. Reflected depending on the variable gear may be a change of gear ratios, either stepped or continuously. The results of kinematic analyses of both variants of differential planetary gearbox with differential in output are shown in tabular and graphical form

Abstract: In this paper, the gear shaping of some planetary gear was simulated. The simulation results show that via the gear shaping process, the gear tooth surface on the left has a single tooth pitch deviation of about 1.2 um, and the gear tooth surface on the right has a pitch deviation of 1.1 um, accordingly. By combining the simulation of two-dimensional and three-dimensional gear shaping models, this paper can not only realize accurately the gear shaping process of the planetary gear, but also provide some certain reference for the gear shaping processing.