Influence of pin profile curve on continuously variable transmission (CVT) chain noise and vibration

Nakazawa, Teruhiko; Hattori, Haruhiro; Tarutani, Ichiro; Yasuhara, Shinji; Inoue, Tsuyoshi

doi:10.1016/j.mechmachtheory.2020.104027

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…R aj , R bj , R hj , and R j denote the addendum, base, dedendum, and pitch circle radii of the gear (j = p:pinion, j = g:gear), respectively. N 1 N 2 and B 1 B 2 are the theoretical and the actual lines of action, respectively, 26 and N 1 N 2 can be obtained by formula (1).…”

Section: The Numerical Computation Methods Of Tvmsmentioning

confidence: 99%

“…Owing to global warming caused by carbon dioxide and shortage of fossil fuel energy, the policies on fuel economy and pollutant emissions for automobiles have become strict. 1,2 Thus, new energy vehicles, such as hybrid electric vehicles (HEV) and battery electric vehicles (BEV), are being developed as an effective solution by manufacturers all over the world. [3][4][5] The transmission system is a core unit of automobile, and it plays a critical role in the driving performance of automobile.…”

Section: Introductionmentioning

confidence: 99%

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An improved time-varying mesh stiffness calculation method and dynamic characteristic analysis for helical gears under variable torque conditions

Hu,

Liu,

Zhang

et al. 2023

Advances in Mechanical Engineering

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Based on the slice theory and numerical calculation methods, the time varying meshing stiffness (TVMS) calculation method of the gear pair was constructed for the helical gear pair of a electric continuously variable transmission (ECVT), and the TVMS of the helical gear were calculated under different constant and time-varying torque in this study. The obtained stiffness values were introduced into the established dynamics model of helical gear system, and the influence of changed TVMS, resulting from the variable speed and torque, on the nonlinear dynamic characteristics of gear pair was analyzed using the Runge-Kutta method. The results show that the proposed TVMS calculation method is very effective in computing the TVMS of helical gear pair under time-varying condition. The TVMS and dynamic transmission error (DTE) increase as the torque increase, and vice versa. Meanwhile, the system exhibits a diverse range of periodic, sub-harmonic, and chaotic behaviors at high speed and at low speed when torque is low, whereas not appear at steady high torque under low speed range. This study offers a method for gaining the TVMS of helical gear pair to analyze the dynamic characteristics of gear pair under actual working condition, and the influence of torque that change with the speed ratio on the dynamic performance of a gear system should be considered in the industrial applications.

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Section: The Numerical Computation Methods Of Tvmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An improved time-varying mesh stiffness calculation method and dynamic characteristic analysis for helical gears under variable torque conditions

Hu,

Liu,

Zhang

et al. 2023

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…The transmitted torque of the clutch is connected to the force of the pressure plate acting on the clutch disc, the coefficient ratio, and the efficient radius of the friction force acting on the clutch disk [30][31][32][33], which can be expressed in Equation (8) according to Equation (6).…”

Section: Clutch-transmitted Torque Analysismentioning

confidence: 99%

“…In low torque conditions, the transmission efficiency is less than 60% caused by the wet clutch and torque converter in the AT and the DCT [6,7]. Therefore, it is very difficult for the AT, CVT, and DCT to provide large torque and high transmission efficiency to meet the demands of heavy-duty vehicles [8][9][10][11]. Currently, the input torque of the AMT can reach to 3400 N•m supplied by ZF Group, which can meet the requirements of large transmitted torque for heavy-duty vehicles.…”

Section: Introductionmentioning

confidence: 99%

Motion Characteristics of a Clutch Actuator for Heavy-Duty Vehicles with Automated Mechanical Transmission

Wang

2021

Actuators

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Clutch control has a great effect on the starting quality and shifting quality of heavy-duty vehicles with automated mechanical transmission (AMT). The motion characteristics of a clutch actuator for heavy-duty vehicles with AMT are studied in this paper to investigate the clutch control strategy further. The modeling principle of the automatic clutch system is analyzed, and a simulation analysis is given to prove its validity and rationality. Normalized velocity and velocity modulation percentage are proposed as evaluation parameters for the clutch actuator driven by pulse width modulation (PWM) signals. Based on an AMT test bench, the actuator motion characteristics are analyzed. Experimental results show that the range of normalized velocity and velocity modulation percentage are obtained for the clutch engagement and disengagement processes. By analyzing the experimental data, the engaging velocity and disengaging velocity of the actuator are estimated using the solenoid valves in combination. The research results provide a fundamental basis for precise controlling of the clutch and improving the smoothness of heave-duty vehicles.

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“…AT has low transmission efficiency and high maintenance costs, thereby increasing operational costs [11][12][13]. CVT has low transmission torque limited by steel belt materials and manufacturing technology, and has been only used in cars [14][15][16]. DCT cannot provide sufficient transmission torque for heavy-duty vehicles owing to its complex mechanical structures and advanced manufacturing technologies [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Parameter Estimation of a Countershaft Brake for Heavy-Duty Vehicles with Automated Mechanical Transmission

2021

Processes

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A countershaft brake is used as a transmission brake (TB) to realize synchronous shifting by reducing the automated mechanical transmission (AMT) input shaft’s speed rapidly. This process is performed to reduce shifting time and improve shifting quality for heavy-duty vehicles equipped with AMT without synchronizer. To improve controlled synchronous shifting, the AMT input shaft’s equivalent resistance torque and the TB’s characteristic parameters are studied. An AMT dynamic model under neutral gear position is analyzed during the synchronous control interval. A dynamic model of the countershaft brake is discussed, and its control flow is given. The parameter identification method of the AMT input shaft’s equivalent resistance torque is given on the basis of the least squares algorithm. The parameter identification of the TB’s characteristic parameters is proposed on the basis of the recursive least squares method (RLSM). Experimental results show that the recursive estimations of the TB’s characteristic parameters under different duty cycles of the TB solenoid valve, including brake torque estimation, estimation accuracy, and braking intensity estimation, can be effectively estimated. The research provides some reliable evidence to further study the synchronous shifting control schedule for heavy-duty vehicles with AMT.

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Influence of pin profile curve on continuously variable transmission (CVT) chain noise and vibration

Cited by 7 publications

References 11 publications

An improved time-varying mesh stiffness calculation method and dynamic characteristic analysis for helical gears under variable torque conditions

An improved time-varying mesh stiffness calculation method and dynamic characteristic analysis for helical gears under variable torque conditions

Motion Characteristics of a Clutch Actuator for Heavy-Duty Vehicles with Automated Mechanical Transmission

Parameter Estimation of a Countershaft Brake for Heavy-Duty Vehicles with Automated Mechanical Transmission

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