The large gear ratio in the I-Shift with crawler gears is made possible by a new gear reduction set that has been added to a standard I-Shift.
Extra gear reduction set
The extra gear reduction set is located directly behind the gearbox clutch housing and consists of two extra gearwheels – one on the input shaft and one on the counter shaft. The extra gear reduction set enables the gearbox to provide a ratio that is almost twice as large as a standard I-Shift.
To make room for the extra gear reduction set, the gearbox has been made 12 cm longer than a standard I-Shift. Many of the new components, such as gearwheels, engaging sleeves and split synchronisers are made of high-strength materials.
Gear ratio is the difference in speed between the input and output shafts in a gearbox. With the highest gear engaged, the gear ratio is 1:1 on a direct drive gearbox, which means that the shafts spin at the same speed. At the lowest gear in the I-Shift with crawler gears, the output shaft spins 32 times more slowly than the engine speed – at a gear ratio of 32:1.
Learn more about I-Shift with crawler gears in this episode of ‘One Minute.