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

The utility model provides a main adjusting mechanism of a gap self-adjusting device in a disc brake, and belongs to the technical field of automobile parts. The problem that an existing main adjusting mechanism is short in service life is solved. Wherein the 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; the lower end of the main adjusting assembly makes contact with the upper end of the transmission piece and can achieve transmission through friction. The main adjusting assembly is sleeved with an abutting piece, an annular face is arranged on the main adjusting assembly, a protruding shoulderis arranged in the abutting piece, the elastic force of the elastic element acts on the abutting piece, and the protruding shoulder abuts against the annular face under the action of the elastic element so that the main adjus