Main adjusting assembly of gap self-adjusting mechanism in disc brake

The utility model provides a main adjusting assembly of a gap self-adjusting mechanism in a disc brake, and belongs to the technical field of automobile parts. The main adjusting assembly solves the problem that an existing main adjusting assembly is poor in working stability. Wherein the first elastic element is used for resetting a brake mechanism in the disc brake, and the main adjustment assembly is connected to the main adjustment shaft in a sleeving mode and can rotate. A transmission piece is fixed on the main adjusting shaft in the circumferential direction; transmission is achieved between the transmission piece and the main adjusting assembly through friction. A second elastic element is arranged on the main adjusting shaft; the elastic element II is positioned in the elastic element I and has the same elastic force direction as the elastic element I; the main adjusting shaft is sleeved with a supporting base, the supporting base is located on the same side of the second elastic element and the firs