Simplicity by Design
Our toroidal traction CVT is both powerful and fuel efficient by design. With a very low parts count, power is not wasted through parasitic losses due to additional gears, hydraulics and numerous clutch packs.
Efficiency is achieved by transferring torque and power from the input (end) flanges to the output (center) flange through 6 actuated rollers. No metal to metal contact occurs as the specially formulated traction oil used in the transmission is trapped at each contact point between rolling element surfaces. The pressure at contact points induces a phase change in the oil which then momentarily becomes visco-elastic, allowing torque to be transferred without slippage.
The unique cam system continuously adjusts the compression force on the rolling elements throughout the entire speed and torque range, further optimizing transmission efficiency. The cam system was also designed to handle any torque spikes that may occur during equipment operation, avoiding any possible slippage.
The heart and soul of the mechanical CVT is the positioning of the 6 rollers between the input and output toroidal flanges. The tilt angle of the rollers determines the transmission ratio and ultimately its output speed. This positioning is controlled by rotating the outer control rings by way of a simple, low power actuator. This movement steers the 6 rollers to the desired position. Force on the control system is minimal and only required during a ratio adjustment.
Roller Angle on Center Disc
Roller Angle on Center Disc
When the rollers are high on the center disc (image B), the output speed is reduced with multiplying the torque. When the rollers are low on the center disc (image A), the output speed is maximized. The full ratio span is 6:1 and the rollers can complete a full span in about 1 second.
(independent of horsepower)
Our mechanical CVT not only offers the best peak efficiency available on the market but it also maintains industry leading efficiencies regardless of input power. Unlike other types of transmissions that are optimized to work in specific narrow power ranges, the toroidal design maintains its efficiency over the complete power and speed range.
Superior Performance with Software
The CVTCORP controller has an open architecture design that allows maximum flexibility for use worldwide.
Our Transmission Control Unit (TCU) allows seamless communication between the user, the engine and the transmission to achieve better fuel economy, reduced emissions and improve user interface, ensuring overall system optimization. The flexibility of CVTCORP’s toroidal technology allows for system integration with Tier IV final engines as well as pre-tier engines.
Inputs and outputs for user controls can be customized for maximum productivity and ease of use.
Special operating modes can be developed for specific applications such as loaders, ground speed cruise control and creeper functions.
over 500,000 Cumulative Hours
Internal testing and in-field experience have led to the development of today’s transmission and in achieving the level of reliability required by the industry. Our facilities can also perform accelerated testing in harsh environments that exceed industry standards and performance criteria. We are constantly researching new designs to improve our software, efficiency and configurations.
Our mechanical variators can be incorporated into multiple transmission layouts and packages for any specific application.
Depending on the needs for optional functionality such as auto-shifting and creeper gearing, the CVT Cartridge can be integrated with a multitude of clutches, synchronizers, gearing and hydraulic circuit arrangements.