scholarly journals Power transmission of a cone roller toroidal traction drive. (2nd Report, Side slip and speed ratio change).

1988 ◽  
Vol 54 (503) ◽  
pp. 1577-1583 ◽  
Author(s):  
Hirohisa TANAKA
Keyword(s):  
Power Transmission ◽  
Speed Ratio ◽  
Traction Drive ◽  
Ratio Change ◽  
Toroidal Traction

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.

Half-Toroidal Traction-Drive Continuously Variable Power Transmission

1996 ◽  
Vol 210 (3) ◽  
pp. 205-212 ◽  
Author(s):  
H Tanaka ◽  
H Machida
Keyword(s):  
Power Transmission ◽  
Exhaust Gas ◽  
Gas Emission ◽  
Traction Drive ◽  
Exhaust Gas Emission ◽  
Torque Capacity ◽  
Variable Power ◽  
Toroidal Traction ◽  
Cycle Endurance ◽  
Input Torque

A continuously variable power transmission (CVT) has a potential to present comfortable cruising, powerful acceleration, fuel economy and improvement of exhaust-gas emission as an automotive power transmission. There have been many developments of the half-toroidal traction-drive CVT since 1980 and ceaseless improvements on the traction material, synthetic fluid and efficiency continue to be made. This paper discusses some fundamental issues such as the influence of spin on the temperature rise of the traction surface, stress-cycle endurance of the traction element and heat transfer of the power roller, and shows the efficiency curve of the latest double-cavity CVT with a nominal input-torque capacity of 340 N m and rotational speed of 7000 r/min working at the maximum Hertzian pressure of 3.2 GPa.

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