Mechanical transmissions
Mechanical transmission consists of a clutch and gears.
Clutch is needed for temporarily disconnecting engine and transmission to engage gear and to make smooth start from standstill. There are used dry clutches and wet clutched. Dry clutch has the same principal that is used in cars and it has a clutch disk and pressure plate attached to the flywheel. Pressure plate keeps the clutch disc tightly against flywheel and power is transmitted from engine to transmission. When operator presses the clutch pedal, the pressure plate springs bend and the disc is then free to rotate separately from engine. With the possibility to disengage clutch, we can synchronize input and output shaft speeds to smoothly change gears.
Gears are main components of a transmission (gearbox). They are used to make different ratios and this is to change shaft speed. Engine speed is much faster than wheel rotation speed and thus the gearbox/transmission is used to reduce routes. This has a positive effect as it increases the power proportionally to reducing speed. The slower the wheels turn, the more power they have.
This is best explained as you drive a car - when it is in first gear, you can accelerate very fast compared to last gear.
In tractor transmissions, we could divide it to two units or groups: gearbox and planetary reduction(s). Gearbox changes the rotation ratio of input and output shaft, planetary reductions later change the shaft speeds more slower and it increases the power transmitted to wheels.
Clutch is needed for temporarily disconnecting engine and transmission to engage gear and to make smooth start from standstill. There are used dry clutches and wet clutched. Dry clutch has the same principal that is used in cars and it has a clutch disk and pressure plate attached to the flywheel. Pressure plate keeps the clutch disc tightly against flywheel and power is transmitted from engine to transmission. When operator presses the clutch pedal, the pressure plate springs bend and the disc is then free to rotate separately from engine. With the possibility to disengage clutch, we can synchronize input and output shaft speeds to smoothly change gears.
Gears are main components of a transmission (gearbox). They are used to make different ratios and this is to change shaft speed. Engine speed is much faster than wheel rotation speed and thus the gearbox/transmission is used to reduce routes. This has a positive effect as it increases the power proportionally to reducing speed. The slower the wheels turn, the more power they have.
This is best explained as you drive a car - when it is in first gear, you can accelerate very fast compared to last gear.
In tractor transmissions, we could divide it to two units or groups: gearbox and planetary reduction(s). Gearbox changes the rotation ratio of input and output shaft, planetary reductions later change the shaft speeds more slower and it increases the power transmitted to wheels.