The John Deere IVT is an easy-to-use transmission with simple and unrivalled ease of operation among all transmissions making it ideal for. More than a transmission, John Deere IVT stands for the first electronic management system, which coordinates the electronically-regulated. The main components of the IVT are a NuVinci N CVT, a planetary gear and a fixed – Power flows and efficiency in infinitely variable transmissions.

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History of IVT/CVT Transmissions by Brandon Gilbert on Prezi

This is typically higher than the RPM that achieves peak efficiency. If buyers do plug in and regularly top-up the battery pack, that number is expected to be 80 mpge, with about 30 miles of all-electric driving possible.

All articles with dead external links Articles with dead external links from February Articles with permanently dead external links Webarchive template wayback links Articles with inconsistent citation formats Pages with citations lacking titles Pages with citations having bare URLs Use dmy dates from January All articles with vague or ambiguous time Vague or ambiguous time from October Vague or ambiguous gdarbox from January All accuracy disputes Articles with disputed statements from December Wikipedia articles needing clarification from August All articles with unsourced statements Articles with unsourced statements from July The Electronic Management System works with the IVT transmission and engine to maintain the selected travel speed at reduced engine rpm when the IVT selector activates the system resulting in increased efficiency and reduced fuel consumption.

Hence a large force, which is larger than the tension in the chain, is required to change the transmission diameter.

Two stops are integrated in the slot of the speed control lever to program two set speeds. Electronic hand and foot throttle.

Transmissions, Infinitely Variable Transmission (IVT™)

Another possible problem with an iCVT is that the pins of the variator pulley can fall-out when they are not engaged with their chain, and wear of the pins and the grooves of the pulley halves can cause some gearbix performance and reliability problems.


Retrieved 6 January Retrieved from ” https: These types can generally transmit more torque, but can be sensitive to contamination. Reverse was produced by reversing the flow of the pump through over-centering of the swash plate. As before, the minimum engine rpm is adjustable in the CommandCenter to allow the operator to customize the tractor to the gwarbox. The needle analog speed display located on the dash allows easy management of the IVT.

Archived from the original on 1 March Archived from the original PDF on 14 July But since the two chain segments are most likely not parallel to each other during operations of an iCVT, it is gearbod that the load on a choking pulley is between 1 and 1.

Continuously variable transmission

The main advantage of this type of CVT is that it is not dependent on friction to transmit power. Once maximum engine power is reached and additional load is placed on the tractor, the IVT transmission will reduce speed enough to keep the motor at maximum power until the tough condition is over, then the transmission will increase the speed back up to the speed selected.

In a CVT with oscillating cones, the torque is transmitted via friction from a variable number of cones according to the torque to be transmitted to a central, barrel-shaped hub. It was used in the Saturn Vue and Saturn Ion models.

Cogset Derailleur gears Hub gear Shaft-driven bicycle Sprocket. Automatic transmission Chain drive Clutch Constant-velocity joint Continuously variable transmission Coupling Differential Direct-shift gearbox Drive shaft Dual-clutch gezrbox Drive wheel Electrohydraulic manual transmission Electrorheological clutch Epicyclic gearing Fluid coupling Friction drive Gear stick Giubo Hotchkiss drive Limited-slip differential Locking differential Manual gearnox Manumatic Parking pawl Park by wire Preselector gearbox Semi-automatic transmission Shift by wire Torque converter Transaxle Transmission control unit Universal joint.


The magnitude of oscillation, sometimes called “stroke”, depends on the distance of the crank pin in the scotch yoke mechanism from the axis of rotation.

Toroidal CVTs are made up of discs and rollers that transmit power between the discs. The CVT could also be manually “shifted” if desired with software-simulated shift geqrbox.

This is similar to a sprocket of a bicycle where there is a section of the sprocket gearbkx is covered by its chain, and a section of the sprocket that is not covered by its chain. If the IVT selector is in the “on” position, clutching to avoid killing the engine is not required. Archived from the original PDF on 17 September As the engines in these machines are typically run at constant power settings to provide hydraulic power or to power machinery, losses in mechanical efficiency are offset by enhanced operational efficiency, such as reduced forward-reverse shuttle times in earthmoving operations.

Inthe US Patent Office issued patent number 7, B1 for a series of hydraulic torque converters that use hydraulic friction rather than mechanical friction as a CVT.

(of mechanical transmissions, gearboxes)

Archived from the original on 10 March IVTs can in some implementations offer better efficiency in the preferred range of operation when compared to other CVTs because most of ovt power flows through geargox planetary gear system and not the controlling CVR. The original design is still manufactured today, and an example and animation of this IVT can be found here.

When the pedaling torque relaxes to lower levels, the transmission self-adjusts toward higher gears, accompanied by an increase in transmission vibration. Since the PTO is no longer involved, the rpm is allowed to go lower than in position 1.