Application of envelope theorem to determine the shapes of contact components in toroidal continuously variable transmission

Li, Qingtao; Dong, Lin; Liao, Min; Jiang, Liang

doi:10.1016/j.mechmachtheory.2018.06.021

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…This category of transmissions includes many different types, which due considerable applicability, have garnered attention from numerous researchers. Authors investigate, e.g., dynamic [1], stress distribution [2], power losses and efficiency [8,9] as well as heat transfer [10] in belt-type CVTs. Other studies concern geometric [3], kinematic [4] and performance [4,11] analyses of ball-type CVTs.…”

Section: Introductionmentioning

confidence: 99%

Performance of a Cam-Type Pulse Continuously Variable Transmission

Pabiszczak

2024

Adv. Sci. Technol. Res. J.

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The aim of this paper is to assess the performance parameters of the cam-type pulse continuously variable transmission, which is a first attempt to investigate this issue in the presented manner. The transmission under investigation comprises two cams in cooperation with two units, each consisting of rollers connected to swing rods mounted on overrunning clutches. To accomplish this, a test stand was built and a detailed testing program was developed takes into consideration the influence of gear ratio, rotational speed, and load on the uniformity of motion and efficiency. Analysis of the obtained results leads to the conclusion that the tested transmission is particularly sensitive to changes in operating conditions, and its overall performance deteriorates as the reduction ratio increases. The best results were achieved with a load below the nominal one, at low rotational speeds and a low speed reduction. The transmission's structure design and operational principle result in significant power losses, as evidenced by an efficiency rating of less than 60%.

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Section: Introductionmentioning

confidence: 99%

Performance of a Cam-Type Pulse Continuously Variable Transmission

Pabiszczak

2024

Adv. Sci. Technol. Res. J.

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“…Different from gear transmission, traction drive CVT is another branch of technology. e main working mechanism of traction drive CVT is the rolling traction (with limit creep motion) between the components whose shapes result in a nominal point or line contact [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Characteristic Investigation and Torque Distribution Diagram-Based Computational Method for Continuously Variable Power-Split Transmission

Liang

et al. 2022

Mathematical Problems in Engineering

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The key parameter of power-split transmission is the planetary ratio. To obtain various planetary ratios in one transmission system, people use complex systems with multiple planetary gear trains, clutches, and brakes. Another solution is replacing the planetary gear train with a planetary traction drive. However, the participation of the planetary traction drive brings about creep and spin motion, which increase the difficulty of precise calculation. In this study, we investigate the relationships between torques and speeds. Then, we derive the torque and speed distribution formulas that consider the influence of spin torque and creep motion. This study is the first step to precisely calculate the emerging power-split transmission with the planetary traction drive. Based on a contact model and a proposed torque distribution diagram method, this study proposes a fast computational method for calculating the performance of the new continuously variable power-split transmission. The results show that the proposed torque distribution diagram-based computational method is feasible, and the planetary traction drive can be a competitive power-split device for power-split transmission.

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