Why Traction Fluids are Necessary

In a continuously variable transmission, the discs and rollers operate together at high pressure, ranging from 10 to 30 kPa (1.5 to 4.5 psi) and even higher. Such conditions will elastically deform even steel. To avoid seizure and abrasion, the discs and rollers must be prevented from coming into direct contact with each other. TDF flows between the discs and rollers, lubricating the surfaces for protection and transmitting power between them.

The graphic below shows how TDF's lubrication increases the capacity to transmit power. This potential to transmit power is referred to as the traction coefficient. As the traction coefficient increases, the traction force increases proportionally. Therefore, a larger traction coefficient must be produced in order to increase the traction force.

TDF for Lubricating Power

TDF provides a greater traction coefficient for a higher traction force. This also avoids slippage and power not being transferred that can occur with a low coefficient of friction between the discs and rollers. An additional feature of Idemitsu's TDF is its ability to instantly turn to solid glass to ensure transmission when high power is needed.

Thus, Idetmitsu's TDF is an essential part of a continuously variable transmission, just as important as the gears or belt.

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