The ease of gear shifting, without ancient tricks such as double squeezing or relocation, we owe to small, usually brass parts, hidden deep in the bowels of the gearbox - synchronizers. Despite the apparent simplicity of these rings, rather strict requirements are imposed on them for the stability of the coefficient of friction. Indeed, it is friction that their work is based on. It is known, for example, that the “wrong” oil filled in the box will primarily affect the ease of switching. The owners of the "eights-nine" is well aware of this problem.
The surface of the synchronizer is usually covered with a thin layer of ceramic, molybdenum or carbon, which is tightly connected to the base during a complex process. It is the application technology that limits the choice of friction material: often the friction coefficient is suitable for it, but it does not work to apply.New synchronizers have become prefabricated: friction “pads” are put into the windows of the rings. New synchronizers have become prefabricated: friction “pads” are put into the windows of the rings.