Critical Analysis of Design of Ravigneaux Planetary Gear Trains

Stanojević, Milan; Tomović, R.; Ivanović, Lozica; Stojаnović, Blaža

doi:10.18485/aeletters.2022.7.1.5

Cited by 8 publications

(6 citation statements)

References 37 publications

(39 reference statements)

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“…They enable efficient power transmission and smooth gear shifting, with a compact design. However, despite their compact design, they can be heavier compared to other simpler transmission systems [29]. However, many electric vehicles use single gear transmissions with a fixed gear ratio, generally having a lower top speed and lower efficiency at high speeds compared to internal combustion engine vehicles, which is a disadvantage for high-speed driving compared to urban driving.…”

Section: Need For Research Necessity For Research On Electric Vehicle...mentioning

confidence: 99%

Two-Speed Transmission Structure and Optimization Design for Electric Vehicles

Jeong,

Han,

Kim

et al. 2023

Machines

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The trend in the global automotive industry is moving towards electric vehicles that do not emit exhaust gases and use eco-friendly fuel. Electric vehicles are more eco-friendly compared to internal combustion engine vehicles, as they emit less carbon dioxide and pollutants. Research and development are actively underway to produce new electric vehicle models in the rapidly growing electric car market. In this study, a 2-speed transmission for electric vehicles, applicable to 300 Nm-class electric cars, has been developed. The 2-speed transmission structure enables efficient energy use and utilizes a planetary gear set and wet multi-plate clutch, which are effective in the power transmission process. The 2-speed transmission developed through the research results of this paper has a compact structure optimized for electric vehicles. The design feasibility of the transmission was verified through performance tests of the prototype, contributing to fuel efficiency improvement and environmental enhancement.

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Section: Need For Research Necessity For Research On Electric Vehicle...mentioning

confidence: 99%

Two-Speed Transmission Structure and Optimization Design for Electric Vehicles

Jeong,

Han,

Kim

et al. 2023

Machines

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“…As the joint reducer of industrial robots, the RV reducer is one of its three core components, mainly installed in the seat, arm, shoulder, and other heavy-duty positions. Compared with other planetary drives, the RV reducer has numerous advantages such as high precision, high rigidity, large speed ratio, and small size, so it is the most widely used reducer in industrial robots [3,4]. Vibration and noise are crucial indicators for assessing the stability and reliability of RV reducers [5].…”

Section: Introductionmentioning

confidence: 99%

Study on Nonlinear Dynamic Characteristics of RV Reducer Transmission System

Han,

Wang,

et al. 2024

Energies

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Rotate vector (RV) reducers have widely been used in high-performance precision drives for industrial robots. However, the current nonlinear dynamic studies on RV reducers are not extensive and require a deeper focus. To bridge this gap, a translational–torsional nonlinear dynamic model for an RV reducer transmission system is proposed. The gear backlash, time-varying mesh stiffness, and comprehensive meshing errors are taken into account in the model. The dimensionless vibration differential equations of the system were derived and solved numerically. By means of bifurcation diagrams, phase trajectories, Poincaré sections, and the power spectrum, the motion state of the system was studied with the bifurcation parameters’ variation, including excitation frequency and meshing damping. The results demonstrate that this system presents enriched nonlinear dynamic characteristics under different parameter combinations. The motion state of the system is more susceptible to change at lower frequencies. Increasing the meshing damping coefficient proves effective in suppressing the occurrence of chaos and reducing vibration amplitudes, significantly enhancing the stability of the transmission system.

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“…Planetary gearing has advantages over classical gearing in terms of compactness, high ratios, high utilization, and uniform load distribution. It also has reduced weight compared to classical gearing and makes good use of space within the drive [3]. The main disadvantage of planetary gearing, however, is the need for high precision in the manufacturing and assembly of the drive elements.…”

Section: Introductionmentioning

confidence: 99%

Design and Testing of a New Type of Planetary Traction Drive Bearing-Type Reducer

Shu,

Yu,

Shu

et al. 2024

Machines

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This paper presents the design and development of a new type of planetary traction drive bearing-type reducer. In this design, the transmission outer ring is replaced with an elastic ring. The design constructs a circular arc at the axial end of the rolling body’s contour line. This ensures that the contact point of this arc with the reducer’s outer ring and the inner ring’s axial end face is maintained on the radial traction contact line. As a result, it can replace the thrust bearing and provide an axial support function. It has the advantages of simple structure, easy processing, smooth transmission, and low noise. This paper first introduces the design and development process of this bearing-type reducer and presents systematic research on its transmission principle and dynamics. Subsequently, in response to the edge effect phenomenon of the outer ring contact line, the contour line of the outer ring is refined by adopting the shaping method used for bearing rollers, establishing a full circular arc profile shaping method, which significantly improves its edge effect. Finally, in our investigations, combined with experimental tests, a prototype of the bearing-type reducer was fabricated, and the speed ratio, torque, and transmission efficiency of the reducer were studied. The results demonstrate that the bearing-type reducer can achieve high transmission accuracy and efficiency. The transmission performance varies significantly under different lubrication conditions, with the peak efficiency reaching as high as 99.97% when using Santotrac 50 traction oil. The results verify the feasibility of the proposed design method and have the potential to be applied in wheel hub motors and robot joints.

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Critical Analysis of Design of Ravigneaux Planetary Gear Trains

Cited by 8 publications

References 37 publications

Two-Speed Transmission Structure and Optimization Design for Electric Vehicles

Two-Speed Transmission Structure and Optimization Design for Electric Vehicles

Study on Nonlinear Dynamic Characteristics of RV Reducer Transmission System

Design and Testing of a New Type of Planetary Traction Drive Bearing-Type Reducer

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