Academic literature on the topic 'Continuously variable transmission (CVT)'

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Journal articles on the topic "Continuously variable transmission (CVT)"

1

Dilip Challirwar, Tanvi. "Continuously Variable Transmission (CVT)." International Journal of Engineering Trends and Technology 67, no. 3 (2019): 62–65. http://dx.doi.org/10.14445/22315381/ijett-v67i3p211.

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2

Ivanov, Konstantin Samson. "Creation of Adaptive-Mechanical Continuously Variable Transmission." Applied Mechanics and Materials 436 (October 2013): 63–70. http://dx.doi.org/10.4028/www.scientific.net/amm.436.63.

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Recently there were patents on not switched gear continuously variable transmission (CVT) without hydro transformer. In transmission wheelwork with two degrees of freedom and one entrance is used. Adaptive mechanism of CVT provides possibility of output link movement with speed inversely to resistance force at constant input power. However the theoretical description of such transmissions is not convincing enough. Obviously at the basis of creation of adaptive transfers with two degrees of freedom essentially new regularity of mechanics lies. Purpose of present work is to formulate regularities of the mechanics allowing creating the adaptive-mechanical continuously variable transmission. The using of the found regularities will allow creating transmissions with mechanical adaptation to variable technological loading.
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Xue, Yuan, Zhen Gou, He Yin, and Xiao Fu Zhang. "Energy Model of Pulse Continuously Variable Transmission." Applied Mechanics and Materials 835 (May 2016): 654–60. http://dx.doi.org/10.4028/www.scientific.net/amm.835.654.

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The low efficiency restricts the development of pulse continuously variable transmission (P-CVT) mainly, so it is an urgent task to reveal the physical essence of P-CVT, find out the main factor of energy loss, optimize the structure and improve the efficiency. In this paper for this problem, the energy model is established, proposing the calculation method of the energy loss in kinematic pair, the energy loss caused by the resistance of lubrication and the energy loss caused by the damping of the materials of transmission machine. And on this basis, the energy loss will be analyzed specifically by taking the Y2 P-CVT for example, pointing out the corresponding measures which can improve the efficiency. Finally, the physical essence of P-CVT is revealed. Therefore, this paper can provide theory for the efficiency analysis and optimal design of P-CVT.
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4

Amoozandeh Nobaveh, Ali, Just L. Herder, and Giuseppe Radaelli. "A compliant Continuously Variable Transmission (CVT)." Mechanism and Machine Theory 184 (June 2023): 105281. http://dx.doi.org/10.1016/j.mechmachtheory.2023.105281.

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5

Goszczak, Jarosław, Bartosz Radzymiński, and Grzegorz Mitukiewicz. "Continuously variable transmission leakage test results." Acta Innovations, no. 31 (April 1, 2019): 5–13. http://dx.doi.org/10.32933/actainnovations.31.1.

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After a short introduction characterizing the general outline of the issue, this paper describes the test results of oil leakage measurements through CVT actuator seals. The research was done using Jatco company's CVT 7 model, the popular gearbox for small passenger cars. Several curves of leakage values are given for both actuators, concerning different conditions such as rotational speed, oil temperature or pressure. In the summary several conclusions are formulated, based on presented test results. The determined maximal value of leakage is about 1 l/min. It emerged that the influence of centrifugal force is negligible. What is more, the observed phenomena are shortly described and projected for more detailed investigation.
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Goszczak, Jarosław, and Bartosz Radzymiński. "Continuously Variable Transmissions - outline." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 6 (2018): 447–51. http://dx.doi.org/10.24136/atest.2018.110.

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Paper concerned the Continuously Variable Transmission (CVT). The comparison of the engine’s work conditions with conventional manual transmission and CVT’s is presented. Also, a short historical track is included. Furthermore, a production data with the forecast is presented for different parts of the World. Various current solutions of continuous ratio change are mentioned with the more detailed description of the most popular design used in passenger cars. Technological challenges and possibilities of further transmission improvement are included.
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7

Tawi, Kamarul Baharin, Izhari Izmi Mazali, Bambang Supriyo, Nurulakmar Abu Husain, Mohd Salman Che Kob, and Yusrina Zainal Abidin. "Pulleys' Axial Movement Mechanism for Electro-Mechanical Continuously Variable Transmission." Applied Mechanics and Materials 663 (October 2014): 185–92. http://dx.doi.org/10.4028/www.scientific.net/amm.663.185.

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Pulley-based continuously variable transmission (CVT) with Metal Pushing V-belt (V-belt) is a type of automotive transmission that is widely applied currently by many car manufacturers worldwide. Unlike the conventional automotive transmissions, in a pulley-based CVT with V-belt, the transmission ratio (CVT ratio) is changed continuously without the use of discrete gears. Instead, the CVT ratio is varied through the simultaneous axial movement of the primary pulley and the secondary pulley. By axially moving both pulleys simultaneously, the radius of the V-belt on both pulleys will be changed accordingly, resulting in the change of the CVT ratio. The existing pulley-based CVTs in the market use electro-hydro-mechanical (EHM) actuation system to change and to maintain the desired CVT ratio through the hydraulic pressure. However, the application of EHM actuation system leads to some disadvantages, particularly in term of the high power consumption from the engine needed to maintain the desired CVT ratio. This reduces the efficiency of the powertrain system, which eventually increases the fuel consumption of the vehicles. In addition to that, the existing pulley-based CVTs also use single acting pulley mechanism to axially move the pulleys for changing the CVT ratio. Therefore, the issue of V-belt's misalignment, which shortens the lifespan of the V-belt, is inevitable here. In this paper, the pulleys' axial movement mechanism that uses electro-mechanical (EM) actuation system is proposed. Consequently, the working principle of the proposal is described and its potential benefits are discussed.
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8

Albers, A., A. Stuffer, and J. Bernhardt. "Continuously variable transmission (CVT) with ceramic components." Materialwissenschaft und Werkstofftechnik 36, no. 3-4 (2005): 96–101. http://dx.doi.org/10.1002/mawe.200500868.

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9

Mantriota, G. "Power split continuously variable transmission systems with high efficiency." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 215, no. 3 (2001): 357–58. http://dx.doi.org/10.1243/0954407011525692.

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Continuously variable transmissions (CVTs) have developed notably in different applications over the past years. This is especially true in the automobile field because of advantages in terms of car handling and efficiency on urban roads. In this work an original functional solution of a power split CVT system is described. The proposed solution allows the generation of a power flow without recirculation. Kinetic characteristics of single-component devices are obtained and the power split CVT system's efficiency is determined by considering how the efficiency of the component devices changes as a function of operating conditions. The advantages for the power split CVT system are therefore shown in terms of power and efficiency in comparison with the single CVT.
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10

Tanaka, H., and H. Machida. "Half-Toroidal Traction-Drive Continuously Variable Power Transmission." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 210, no. 3 (1996): 205–12. http://dx.doi.org/10.1243/pime_proc_1996_210_500_02.

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A continuously variable power transmission (CVT) has a potential to present comfortable cruising, powerful acceleration, fuel economy and improvement of exhaust-gas emission as an automotive power transmission. There have been many developments of the half-toroidal traction-drive CVT since 1980 and ceaseless improvements on the traction material, synthetic fluid and efficiency continue to be made. This paper discusses some fundamental issues such as the influence of spin on the temperature rise of the traction surface, stress-cycle endurance of the traction element and heat transfer of the power roller, and shows the efficiency curve of the latest double-cavity CVT with a nominal input-torque capacity of 340 N m and rotational speed of 7000 r/min working at the maximum Hertzian pressure of 3.2 GPa.
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