scholarly journals Power Transmission of Half-Toroidal Traction Drive Continuously Variable Transmission. 4th Report, 4 Wheel Drive CVT Design and its Performance.

1993 ◽  
Vol 59 (560) ◽  
pp. 1161-1165
Author(s):  
Hirohisa Tanaka ◽  
Masatoshi Eguchi ◽  
Hisashi Machida ◽  
Takashi Imanishi
Keyword(s):  
Power Transmission ◽  
Continuously Variable Transmission ◽  
Traction Drive ◽  
Wheel Drive ◽  
Variable Transmission ◽  
Toroidal Traction

Constant Power Continuously Variable Transmission (CP-CVT): Operating Principle and Analysis

2005 ◽  
Vol 127 (1) ◽  
pp. 114-119 ◽  
Author(s):  
O. S. Cretu ◽  
R. P. Glovnea
Keyword(s):  
Automobile Industry ◽  
Rotation Axis ◽  
Continuously Variable Transmission ◽  
Constant Power ◽  
Traction Drive ◽  
Power Characteristics ◽  
Input And Output ◽  
Output Torque ◽  
Variable Transmission ◽  
Toroidal Traction

The paper is the first of a series of papers that present an original constant power continuously variable transmission (CP-CVT) traction drive. This paper presents the basic functional principle and demonstrates the device’s characteristics of constant power. The device belongs to the well-known toroidal traction drive family. It comprises of two input discs, one conical and the other toroidal, a conical output disc, and a number of spherical balls. The rotation axis of each ball is self-adjusted according to its geometrical position relative to the input and output discs. A variation of the output torque makes the balls change their position relative to the discs and thus causes a change of the transmission ratio. The kinematics and dynamics of the balls are first performed and then the formulas that relate the power transmitted to the kinematics and geometric parameters are deducted. Finally it is concluded that the CP-CVT presented offers good functional steady power characteristics that could fit the automobile industry requirements.

Development of the Sphere-Toroidal Continuously Variable Transmission

2014 ◽  
Vol 986-987 ◽  
pp. 1315-1318
Author(s):  
Shun Min Wang ◽  
Zhuo Li ◽  
Xin Yu Wang ◽  
Xi Chao Li
Keyword(s):  
Continuously Variable Transmission ◽  
Traction Drive ◽  
Input Shaft ◽  
Variable Transmission ◽  
Working Principle ◽  
The Cross ◽  
The Difference ◽  
Toroidal Traction

This paper describes a new genre of Toroidal-CVT system, called the Sphere-Toroidal Continuously Variable Transmission (STCVT), which is derived from the half-toroidal traction drive (TCVT) and introduces its structure and working principle. The torque transfers from the input shaft to the cross-axle universal shaft coupling connected with the driven shaft. By discussing the difference between the torque-transfer, the paper will show the possibility of the application in the vehicle. To conclude, the system has the potential to implement infinite extension for the CVT theoretically.

Causes of Slip in a Continuously Variable Transmission

2003 ◽  
Author(s):  
Songho Kim ◽  
Michael Peshkin ◽  
J. Edward Colgate
Keyword(s):  
Empirical Data ◽  
Velocity Ratio ◽  
Continuously Variable Transmission ◽  
Lateral Loads ◽  
Measured Velocity ◽  
Traction Drive ◽  
The Face ◽  
Variable Transmission ◽  
Computer Controlled ◽  
The Ideal

Rotational CVTs (continuously varible transmissions) constrain the velocities of two rotational joints to a computer-controlled ratio. CVTs traction drive mechanisms that rely on the support of traction forces across rolling contracts. When called upon to transmit loads, CVTs produce a velocity ratio that departs from the ideal transmission ratio. This paper reports on the results of our analysis in pursuit of understanding the mechanics of the rotational CVT. We present the measured velocity ratios in the face of lateral loads at various transmission settings. In addition, wer present our model that closely fits the empirical data.

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