Transmission ratio calibration for electro-mechanically actuated continuously variable transmission

2017 ◽  
Vol 7 (3) ◽  
pp. 127
Author(s):  
Izhari Izmi Mazali ◽  
Kamarul Baharin Tawi ◽  
Bambang Supriyo ◽  
Nurulakmar Abu Husain ◽  
Mohd Salman Che Kob ◽  
...  
Keyword(s):  
Continuously Variable Transmission ◽  
Transmission Ratio ◽  
Variable Transmission

Research on Pulley Strain of Metal Belt CVT

2014 ◽  
Vol 952 ◽  
pp. 249-252
Author(s):  
Wu Zhang ◽  
Wei Guo ◽  
Fa Rong Kou ◽  
Yi Zhi Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Method ◽  
Compressive Strain ◽  
Continuously Variable Transmission ◽  
Transmission Ratio ◽  
Element Analysis ◽  
Variable Transmission

Pulley strain aggravated whole-Part abrasion, affected friction and lubricates state of metal belt continuously variable transmission. Pulley strain was analyzed by analytical method and finite element analysis. The results indicate that with the increase of transmission ratio, the driver pulley compressive strain is increases after reduces for a while, and the driven pulley increase. Compressive strain dense when radius is lesser and vice versa. Two methods results are basically the same, whereby demonstrating that the model is rational and that the analysis results are reliable.

scholarly journals Design Principles and Traction Performance of a Novel Zero-spin Rolling Conical Traction Continuously Variable Transmission

2020 ◽  
Author(s):  
Chao Li ◽  
Xiuquan Cao ◽  
Qing-tao Li
Keyword(s):  
Numerical Model ◽  
Computational Models ◽  
Design Principles ◽  
Transmission Efficiency ◽  
Continuously Variable Transmission ◽  
Transmission Ratio ◽  
Variable Transmission ◽  
Contact Models ◽  
Spin Momentum

Abstract In the existing traction continuously variable transmission (CVT), half toroidal CVT (HT-CVT) is considered to have a better traction performance. However, the HT-CVT has the spin losses due to its structural limitations, which significantly influences the traction efficiency. In this paper, the kinematic qualities and contact models of a novel zero-spin rolling conical CVT (RC-CVT) are studied, and then the rollers and conical disks are compactly designed through the proposed design principles. Subsequently, the transmission efficiency is investigated by using a detailed numerical model and compared with HT-CVT. Based on these computational models and parameters, the practical spin ratio, spin momentum and traction efficiency of RC-CVT are calculated and compared with HT-CVT. The results show that the practical spin ratio and spin momentum of RC-CVT are much smaller than that of HT-CVT, and the efficiency on fixed transmission ratio is consequently higher than that of HT-CVT.

Double-Cage Constant Power Continuously Variable Transmission (CP-CVT)

2006 ◽  
Author(s):  
Romeo P. Glovnea ◽  
Ovidiu S. Cretu
Keyword(s):  
Continuously Variable Transmission ◽  
Maximum Power ◽  
Transmission Ratio ◽  
Kinematics And Dynamics ◽  
Constant Power ◽  
Active Elements ◽  
Internal Geometry ◽  
Variable Transmission ◽  
Specific Geometry ◽  
New Generation

The paper focuses on the internal construction of an original Constant Power Continuously Variable Transmission (CP-CVT). In a recent publication the authors have introduced the fundamentals of the kinematics and dynamics of the CP-CVT. The present study focuses on the optimisation of the CP-CVT’s internal geometry and the size of its active elements in order to obtain maximum power transmitted with least variation over a range of transmission ratio. The paper concludes that for a specific geometry the CP-CVT presented offers promising characteristics that recommend it as a good candidate in the race of developing a new generation of the automobiles’ powertrain.

Axial Force Test and Modelling of the V-Belt Continuously Variable Transmission for Mopeds

1996 ◽  
Vol 118 (2) ◽  
pp. 266-273 ◽  
Author(s):  
F. Ferrando ◽  
F. Martin ◽  
C. Riba
Keyword(s):  
Axial Force ◽  
Empirical Model ◽  
Test Bench ◽  
Continuously Variable Transmission ◽  
Transmission Ratio ◽  
Torque Transmission ◽  
Variable Transmission

This article discusses the experiments and modelling carried out on a V-belt continuously variable transmission (CVT) of the type that is used in mopeds. Our aim was to characterize the forces which determine how the system functions. A test bench was designed for them to be determined experimentally and a series of tests which cover the variable conditions of speed, torque, transmission ratio and tension of a CVT are carried out. Estimates of the principal existing models are compared and an empirical model for assessing these forces is discussed.

On the design and tuning of the controllers in a power-split continuously variable transmission for agricultural tractors

2003 ◽  
Vol 217 (8) ◽  
pp. 745-759 ◽  
Author(s):  
S M Savaresi ◽  
F Taroni ◽  
F Prevedi ◽  
S Bittanti
Keyword(s):  
High Efficiency ◽  
Continuously Variable Transmission ◽  
System Structure ◽  
Transmission Ratio ◽  
Mechanical Transmission ◽  
Power Split ◽  
Variable Transmission ◽  
Servo Controller ◽  
Automatic Controllers ◽  
Agricultural Tractors

In this work, a power-split continuously variable transmission (CVT) used in high-power tractors is considered. Power-split CVTs are characterized by the combination of a traditional discontinuous mechanical transmission and a continuously variable transmission. This provides, at the same time, smooth variations of the transmission ratio and high efficiency of the overall transmission system. The CVT considered in this paper is a hydrostatic power-split unit conceived for top-power agricultural tractors. The goal of this paper is to present a case study on the design and tuning of the control system structure for this type of CVT. This structure consists of three main parts: a servo controller on the internal current of the valve of the hydraulic transmission; a servo controller on the hydraulic transmission ratio; a synchronizer which coordinates the hydraulic and the mechanical parts of the CVT. The design, tuning and testing of this set of automatic controllers is presented.

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