Abstract: A rapid leakage-proof structure for tubes covers an outer surface of a tube and contains an inner soft layer with a first hardness attached to the outer surface of the tube, an outer hard layer with a second hardness covering a surface at one side of the inner soft layer that is far away from the tube, and a clamping assembly. The first hardness is smaller than 60 degrees at Shore Hardness, and the second hardness is greater than the first hardness. The clamping assembly is disposed at one side of the outer hard layer that is far away from the tube to clamp the tube via the outer hard layer and inner soft layer. Thereby, the inner soft layer covers the surface of the tube to obtain high sealing, and the outer hard layer then covers the inner soft layer to prevent leakage caused by insufficient sealing pressure.

Abstract: The present invention provides a stabilizing structure of a model car including two tires, a differential between the tire, and two transmission shafts having opposite ends connected to the tires and the differential respectively. The differential has a case, a pair of bearings disposed on the case, and a pair of shafts. The shafts pass through opposite walls of the case. Each of the shafts has an opening, and the opening extends through the corresponding bearing. The transmission shafts have ends connected to the tires and opposite ends movably connected to the openings of the shafts. The transmission shafts of the present invention are longer than the conventional transmission shafts. It may reduce the swinging angle when the model car runs on a rough road to stabilize the car and raise the speed.