Design and analysis of the bearingless planetary gearbox

Georgiev, Nikola; Burdick, Joel W.

doi:10.1109/iros.2017.8206018

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…However, they possess inherent advantages in high speed, miniaturization, high-efficiency performance, transmission accuracy, and low vibration. These features have made traction drives a research hotspot in the transmission community [6][7][8][9]. They have been applied in industrial robots, medical equipment, automation equipment, aerospace, and electric vehicles.…”

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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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

View full text Add to dashboard Cite

show abstract

“…In addition, as to traditional gear reducers, on the one hand, high-speed working conditions pose challenges to gear fatigue life and noise, vibration and harshness (NVH) (Lei et al, 2020;Ouyang et al, 2017;Wang et al, 2021); on the other hand, transmission errors caused by factors such as design, manufacturing and assembly have an adverse effect on the high speed of the gear reducer (Bozca, 2018;Liu et al, 2017). Considering the above problems, although the traditional gear reducer can be avoided by improving its processing quality and accuracy, it also directly leads to higher manufacturing costs (Georgiev and Burdick, 2017).…”

Section: Introductionmentioning

confidence: 99%

A novel traction reducer: analysis and verification

LI,

WANG,

JIANG

et al. 2024

JAMDSM

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With the global trend of electrification and the development of high-speed motor technology, the demand for high-speed reducers has been greatly promoted. As we all know, traction drive has certain inherent advantages in high-speed transmission. Therefore, this paper takes an asymmetric loading multi-roller planetary traction drive reducer as the research object. First, the kinematics and mechanics of the reducer are analyzed theoretically. Secondly, an equivalent simulation model is established according to its unique loading principle. In addition, the kinematic characteristics of the mechanism and the contact forces of its key components are obtained through mechanical simulation. The results show that the maximum relative error between the kinematic simulation value and the theoretical value of the reducer is 0.14%, the mean absolute percentage error (MAPE) of each contact force simulation value and the theoretical value is less than 5%, which verifies the effectiveness of the loading mechanism and the correctness of the theoretical analysis. Finally, the reducer transmission test rig was designed and built, and the advantages of precision transmission were verified by testing its actual speed ratio and repeated positioning accuracy.

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“…In the world of drive systems, some factors limit the application scope of harmonic and cycloid reducers such as lowspeed characteristic, temperature rise, vibration loss, and efficiency performance (Georgiev and Burdick, 2017), although they have advantages in output torque capacity and speed ratio. Comparing to gear drive systems, the high contact pressure and low capacity of the traction drives make it hard to be applied in low speed and heavy load situations.…”

Section: Introductionmentioning

confidence: 99%

Adaptive loading ball traction drive reducer: modeling and efficiency performance

Luo

Wang

Jiang

et al. 2021

JAMDSM

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In this paper, a novel type of adaptive loading ball traction drive reducer (AL-BTDR) is proposed and investigated in modeling and efficiency performance. A combination of power flow and equal linear velocity method is developed to evaluate the speed ratio for the first time. Meanwhile, the spin loss at contact areas is also analyzed based on the Hertz contact theory, and a new approach depended on power flow is introduced to establish the efficiency model. By applying the efficiency model, the performance of efficiency with different output torque is calculated, and the distinctions under adaptive loading and constant loading are investigated. The results show that AL-BTDR has an excellent efficiency performance under adaptive loading with a maximum of 91%. Additionally, efficiency is higher under adaptive loading and will not sharply drop when compared with constant loading.

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Design and analysis of the bearingless planetary gearbox

Cited by 7 publications

References 10 publications

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

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

A novel traction reducer: analysis and verification

Adaptive loading ball traction drive reducer: modeling and efficiency performance

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