The mCVT transmission uses a toroidal architecture which offers smooth, seamless shifting with no steps through an infinite number of speeds. The infinite number of ratio enables the engine to operate at or close to its “sweet spot” therefore driving significant fuel economy. The CVT also makes construction equipment easier to drive, safer, more productive and due to its high efficiency, provides the OEM’s with the opportunity to downsize engine. Using a smaller engine and potentially cheaper emission after-treatment result in major system cost reduction for the OEM’s.
The mCVT efficiency compares very favorably to other types of transmission:
When compare to a powershift with torque converter, the efficiency is better AND enable using the engine at its most efficient point, which increases fuel economy.
Compared to other CVT’s such as a hydrostatic transmission, the efficiency is 15-20% better and is similar or better than hydromechanical CVT’s typically used on large equipment and agricultural tractor while being much more cost effective.
When the rollers are high on the center disc, the output speed is reduced with multiplying the torque.
When the rollers are low on the center disc, the output speed is maximized.
The full ratio span is 6:1.
Our mechanical CVT not only offers the best peak efficiency (up to 94%) 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 traction drive design maintains its efficiency over the complete power and speed range.
Our traction drive CVT is both powerful and fuel efficient by design. With a very low parts count, power is not wasted through parasitic losses due to excessive gearing, hydraulics and numerous clutch packs.
Efficiency is achieved by transferring torque and power from the input (end) discs to the output (center) disc 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 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.
Over 500,000 hours of testing in laboratories and real-life applications by OEMs (Original Equipment Manufacturers) and CVTCORP.
– Over 200 units tested in the field
– 25,000 hours accelerated life test
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.
Hybridization and full-electrified drivelines for construction machinery and agricultural applications are emerging as feasible power solutions for the off-highway sector.Using an mCVT in a fully electric driveline allows for the downsizing of the e-motor/drive, increase both the low end torque and the top speed while limiting battery draw peaks.
In a hybrid configuration including the mCVT both the e-motor and the engine can be downsized while different modes such as charging mode, battery management, recuperation, fuel economy, hydraulic drive, acceleration, etc…are enabled.
The CVTCORP transmission has an open architecture controller for each application 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 traction drive technology allows for system integration with Tier IV final engines as well as earlier 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.
Same cartridge can be on a tractor, a backhoe loader, a telehandler and a harvester.
Different software & different gearing
Electrified powertrains either hybrid or full electric are getting rapid acceptance in the off-highway market. With the torque multiplication of the CVT then, there is a great opportunity to optimize the full e-powertrain and properly size motors, generators, inverters, batteries and battery management system resulting in smaller packages, enhanced range and reduced cost.