These are often called automatic transmissions, as they gear ratio changes automatically using the Automatic gearbox control or joint action of the transformer torque and automatic control equipment. Widespread hydromechanical (Torque and speed manual gearbox), hydrostatic (hydraulic pump and motors) and electromechanical (generators, motors and mechanical gear) transmission. Hydromechanical transmission is most often used for passenger A. High-grade and large buses, electromechanical – particularly for heavy trucks aa Chassis aa consists of a frame, suspension, axles (bridges) and wheels. A.
Rama serves to setting body, cabin, engine, gearbox and other mechanisms and assemblies. A. Most cars and buses frame replaces the body, which in this case is a strong and rigid bearing system. A. Suspension performs an elastic connection frame or the carrier body with the axes (axles). With the help of the suspension transmits the forces acting on the wheel frame (body), soften dynamic load fluctuations is given the desired character that provides the necessary ride and stability of aa in the motion. For a long time on aa was used as a suspension leaf springs, then as the elastic element was used as coiled springs, torsion bars, pneumatic or hydro-pneumatic elements. For a quick damping of the suspension system introduced absorbers (usually hydraulic lever and telescoping), and to reduce roll when cornering – stabilizer bars. Widespread independent wheel suspension, in which each wheel is suspended from the frame separately, so that the change in the position of one of them does not cause displacement of another.