So that when driving and driving you do not feel any influence of a change in the mode of movement on control, the joints of the drive shafts must transmit torque completely evenly in all positions of the shock absorbers and the steering column. This is the task of the hinges located at the ends of the drive shafts. In the Audi-100 model series, we deal with two different types of hinges:
Some are the so-called homokinetic hinges (constant velocity joints - CV joints). Their action is based on six balls, which, when the hinge is bent, move in specially ground raceways. Thus, an absolutely uniform transmission of torque is ensured at any angle of rotation of the drive shaft allowed in the car. CV joints are found on all manual transmission vehicles with 4- and 5-cylinder engines, as well as on all four-wheel drive models (front and back). On models with automatic transmission and models with a 6-cylinder engine, they are used as external hinges.
On the gearbox side - i.e. as internal joints - on vehicles with automatic transmission (front-wheel drive and all-wheel drive - then, however, only the front) and vehicles with a 6-cylinder engine (front wheel drive) the so-called hinges of equal angular velocities are installed «tripod». Instead of six balls, this hinge is equipped with three rollers on needle bearings. The advantage of this design is the negligible transmission of vibrations from the drive to the body.
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