Inner rubber shell and knob cap thereof

The utility model discloses an inner rubber shell and a knob cap thereof, and belongs to the technical field of knobs, the inner rubber shell comprises an outer ring used for being connected with a metal shell and an inner ring used for being connected with an opponent piece, the outer ring is in interference fit with the metal shell, the inner ring is sleeved and connected to the inner diameter side of the outer ring, the outer ring and the inner ring are concentric and have a distance, and the outer ring and the inner ring are in interference fit. Reinforcing ribs are connected between the inner diameter side of the outer ring and the outer diameter side of the inner ring in the radial direction, the reinforcing ribs are evenly distributed in the circumferential direction, and reducing rubber is arranged at the positions, corresponding to the reinforcing ribs, of the outer circumferential face of the outer ring. According to the utility model, the reducing rubber is arranged on the circumferential surface o