Manual Transmission

Gear change box type 085

Gear change box type 020

Gear change box-type 02A

Replacing the secondary shaft

Gearbox transmits torque from the engine to the drive wheels through a front wheel drive. With the gearbox can be increased traction on the drive wheels by changing the gear ratio of gears, which is necessary for overcoming the heavy sections of track, starting and acceleration. Transmission also changes the direction of rotation of the drive wheels to drive the vehicle in reverse. Switching the transmission to a neutral position and disengage the engine drive wheels, which is necessary when coasting (inertial), towed and parked and the engine is started.

On cars Golf III / Vento depending on the model of the engine used mechanical five-speed transmission of type 085, 020 and 02A.

Parameters transmissions with manual presented in Table. 5.2.

Transmission with manual installed transversely in the engine compartment and is bolted directly to the engine. This arrangement has the advantage of providing the shortest possible transmission path of the torque to the front wheels, and moreover, allows to optimize the cooling due to the fact that the gearbox is located in the stream of air moving through the engine compartment. Ribbed surface casing, in addition to creating the necessary rigidity, ensures good heat dissipation.

The torque from the crankshaft is transmitted through the clutch on the gearbox output shaft, which has slots for mounting the clutch disc.

Synchronizer applicable to all forward gears.

The drive gear is designed to control the transmission driver of the car.

Gear selection is performed by means of the lever mounted on the floor of the cabin, which is associated with a transmission rod or cables and gear selection, depending on the type of transmission. Link cables or drive the number of plugs located inside the gearbox which are installed in the recesses sliding sleeves synchronizers. Clutches are locked onto the shaft of the gearbox, but can slide them in the axial direction due to the presence of ground hubs, pressed against the blocking ring, bringing them into contact with the appropriate gear. The conical contact surface of the locking ring and the gear acts as a friction clutch, which equalizes gradually moving speed synchronizer sleeve (and hence transmission shaft) and the speed gears. The locking finger entering the cutouts, the locking ring prevents the engagement of the clutch ring gear synchronizer as long as their speed will not be equal. This provides smooth shifting and greatly reduces noise and wear caused by rapid gear changes. Torque is transmitted to the ring gear that transmits rotation through satellites planetary gear to the sun gear differential and drive shafts. The rotation of the satellite on its axis allows the inner wheel of the car when cornering rotate at a slower speed than the outside. The main gear and the differential housed in a single housing such that disassembly of the node inevitably leads to a malfunction of another node. Adjustment and repair of the main transmission require the use of a number of special tools and devices.

All transmissions are equipped with an electronic speed sensor. This device measures the speed of the main transmission, and converts the measurement result into an electrical signal which is then passed to block a speedometer on the instrument panel. On some models, this signal is also input to the engine management system.

In cars with a five-manual models 02A and 085 used "traditional" pattern of the clutch mechanism (see. Fig. 5.2) with a flywheel, mounted directly on the crankshaft. In cars with a five-speed manual transmission model 020 pressure plate mounted on the flange of the crankshaft (see. Fig. 5.1).