Synchronized gearbox.
To eliminate noise, which can occur when gears are engaged, the so-called. synchronized gearboxes, e.g. in M-20 Warsaw cars. The gears of the synchronized gears on the main shaft are constantly in mesh with the corresponding idler shaft gears. The helical gears on the main shaft therefore have a free rotational movement on the shaft, which is provided with bearings at their seat. Only the first and reverse gear can be engaged by the sliding wheels, because they are used less often and are activated, above all, when the car is stationary. The other gears are permanently in mesh with each other and are switched on or off by means of e.g.. claw couplings.
The claw clutch is mounted on the spline of the main shaft, between the wheels and can be moved along the shaft. The dog clutch rotates with the main shaft. The gear is engaged by coupling the appropriate gear with the main shaft by means of a clutch clutch. If the dog clutch is moved to the right, the drive will be transmitted from the lay shaft via the third gear gears to the main shaft of the gearbox. If the dog clutch is shifted to the left, direct gear is achieved.