Full-Toroidal Traction Drive Variator Material and Fluid Durability

2011 ◽  
Vol 4 (1) ◽  
pp. 2135-2141 ◽  
Author(s):  
Adrian P. Lee
Keyword(s):  
Traction Drive ◽  
Toroidal Traction

The Perbury Transmission

1980 ◽  
Vol 102 (4) ◽  
pp. 937-942 ◽  
Author(s):  
F. G. de B. Perry
Keyword(s):  
Future Development ◽  
Present Status ◽  
Traction Drive ◽  
Toroidal Traction ◽  
Development Applications

The Perbury transmission is a form of toroidal traction drive. This descriptive paper presents a brief overall view of its principles, background, present status of development, applications and future development areas.

A Systematic Model for the Analysis of Contact, Side Slip and Traction of Toroidal Drives

1999 ◽  
Vol 122 (4) ◽  
pp. 523-528 ◽  
Author(s):  
Y. Zhang ◽  
X. Zhang ◽  
W. Tobler
Keyword(s):  
Traction Force ◽  
Hertzian Contact ◽  
Contact Theory ◽  
Kinematic Parameters ◽  
Traction Drive ◽  
Continuously Variable Transmissions ◽  
Toroidal Traction ◽  
Hertzian Contact Theory ◽  
Slip Force ◽  
Ratio Range

This paper presents a systematic model for the design and analysis of toroidal traction drive continuously variable transmissions (CVT). The contacts between the input disk, the roller and the output disk of the traction drive are formulated using the classical Hertzian contact theory. The traction force and side slip force occurring in CVT operation are modelled based on the elasto-hydrodynammic theory and are correlated to the traction drive geometric and kinematic parameters. The model allows for the quantitative analysis of traction drive operation under various torque inputs and over the desired ratio range. [S1050-0472(00)01004-7]

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.

Electro-Hydraulic Digital Control of Cone-Roller Toroidal Traction Drive Automatic Power Transmission

1984 ◽  
Vol 106 (4) ◽  
pp. 305-310 ◽  
Author(s):  
H. Tanaka ◽  
T. Ishihara
Keyword(s):  
Power Transmission ◽  
Computer Control ◽  
Speed Ratio ◽  
Test Results ◽  
Optimum Conditions ◽  
Propulsion Systems ◽  
Traction Drive ◽  
Automatic Transmissions ◽  
Optimum Speed ◽  
Toroidal Traction

Continuously variable automatic transmissions can bring improved fuel economy benefits under good speed ratio changes for automobile propulsion systems in which engines can produce their power under optimum conditions. These systems require computer control for the calculation of optimum speed ratio. The paper presents design features of the electrohydraulic interface between micro-computer and cone-roller toroidal traction drive CVT, dynamic characteristics of cone roller motion, and test results of the practical computer control of CVT.

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