1P1-B15 Improvement of Power Transmission on Wide Range Continuously Variable Transmission by Applying Elastic Wheel

2010 ◽  
Vol 2010 (0) ◽  
pp. _1P1-B15_1-_1P1-B15_3
Author(s):  
Yutaro HISHIMOTO ◽  
Yoshimitu IMAI ◽  
Satoshi KITAMURA ◽  
Taro IWAMOTO
Keyword(s):  
Power Transmission ◽  
Continuously Variable Transmission ◽  
Elastic Wheel ◽  
Wide Range ◽  
Variable Transmission

scholarly journals Experimental Characteristics of Mechanical Continuously Variable Transmission with Internal Force Functions

2021 ◽  
Vol 20 (4) ◽  
pp. 310-319
Author(s):  
A. V. Yurkevich ◽  
A. V. Tereshin ◽  
V. A. Soldatkin
Keyword(s):  
Power Transmission ◽  
Rotation Frequency ◽  
Internal Force ◽  
Gear Ratio ◽  
Continuously Variable Transmission ◽  
Recording Equipment ◽  
Internal Link ◽  
Variable Transmission ◽  
New Type ◽  
Transformer Ratio

The paper proposes a new type of a mechanical continuously variable transmission with internal force functions  to upgrade the energy efficiency of a vehicle equipped with a conventional engine. The prototype of the transmission is a well-known V. F. Maltsev concurrent pulse variator in which freewheel mechanism driven members are supplemented with elastic torsions shafts. It is shown that the variator turns into a continuous transformer – a mechanical continuously variable transmission with internal force functions. There is an internal automaticity and continuity in the entire range of gear ratio changes. The configuration engineering solution is implemented in the engineering prototype. The aim of the research is experimental study of the properties and characteristics of such a mechanical continuously variable transmission. The kinematic configuration and the main structural dimensions of the engineering prototype are given. Special testing facility and measuring-and-recording equipment have been developed. A set of parameters to be recorded has been specified. The accuracy of their measurement is statistically estimated. The results of the experiments are presented in terms of output and input torque dependencies on the speed of the driven shaft. It is shown that the transmission characteristics in their dimensionless form (transformer ratio and efficiency) in the function of internal gear ratio are universal. The possibility of obtaining an infinite kinematic and significant power transmission ranges by independently changing the internal link oscillation range (level of the force function) and the rotation frequency of the drive shaft has been experimentally shown. The transmission  has high transforming and energy properties, which are higher than those of hydrodynamic gears.

FEM Simulation of Continuously Variable Transmission (CVT) with Built in Gear Hub Type for Bicycles

2011 ◽  
Vol 52-54 ◽  
pp. 1836-1839
Author(s):  
Seung Yub Baek ◽  
Jung Shik Kong ◽  
Hyung Seop Kim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Simple Structure ◽  
Power Transmission ◽  
Fem Simulation ◽  
Continuously Variable Transmission ◽  
Quiescent State ◽  
Displacement Analysis ◽  
External Contamination ◽  
Variable Transmission

The two kinds of bicycles of the power transmission types are derailleur type and built in gear hub type. Derailleur type is a simple structure but it is vulnerable to external contamination and impact. And it is impossible to shift from the quiescent state. Built in gear hub type is very strong about the external contamination and impact because working part did not expose to the outside. In this paper, a new design of a continuously variable transmission with built in gear hub type for bicycles was developed and simulated. Stress and displacement analysis in built in gear hub by using finite element method were performed in order to develop improved structure of CVT.

Analysis of a New Form of Intrinsically Automatic Continuously Variable Transmission

2010 ◽  
Author(s):  
Timothy Cyders ◽  
Robert L. Williams
Keyword(s):  
Power Transmission ◽  
Mechanical Design ◽  
Peak Torque ◽  
Continuously Variable Transmission ◽  
Speed Ratio ◽  
Input Shaft ◽  
Positive Displacement ◽  
Variable Transmission ◽  
System Output ◽  
Human Powered

Effective continuously variable transmission (CVT) designs have been sought after for many years as their integration into many different mechanical systems can give many advantages over a discrete transmission system. Currently, CVTs are becoming popular for applications from automotive power transmission to wind power generation. Most CVT technologies, however, are friction- or hydraulic-based designs limited by both performance and system characteristics. This paper will evaluate a new, patented form of purely mechanical, intrinsically automatic CVT which is not based on belts, pulleys, gears or hydraulics. This new transmission is based on a deformable four-bar design incorporating a one-way clutch for positive displacement of the output. As torque demand on the system output is varied, the output’s displacement varies inversely to maintain a constant peak torque on the input shaft. The end result of this behavior is a possible instantaneous variation of speed ratio over an extreme range with a lightweight, simple mechanical design. This paper provides an analysis of the mechanism and its performance, as well as simulation results incorporating real-world measurement of system output into several different mechanical applications: a human-powered vehicle, an automobile and a centrifugal pump.

Maximum Transmission Efficiency of a Steel Belt Continuously Variable Transmission

1992 ◽  
Author(s):  
M. Guebeli ◽  
J. D. Micklem ◽  
C. R. Burrows
Keyword(s):  
Power Transmission ◽  
Transmission Loss ◽  
Transmission Efficiency ◽  
Continuously Variable Transmission ◽  
Hydraulic Pump ◽  
Viscous Oil ◽  
Variable Transmission ◽  
Adjustment Dynamics ◽  
Maximum Transmission

Abstract A mathematical model of the power transmission through a Van Doorne steel belt continuously variable transmission is developed. The approach is based on a simplified viscous oil shear stress model. This enables the determination of the power transmission loss resulting from shearing the oil film along the traction line. The power to maintain the necessary hydraulic clamping forces is taken into account to optimise the power transmission efficiency. The analytical solution is evaluated numerically and compared with experimental results. Variations in the hydraulic pump displacement that is determined by the required ratio adjustment dynamics show that with a sufficiently small pump, peak efficiencies exceeding 97% are possible.

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