Expansion drum, radiator assembly and vehicle

The utility model relates to an expansion drum, radiator assembly and vehicle, wherein, the expansion drum includes the jar body (1) that is used for holding the coolant liquid, and follows the jar body (1) outside convex journal stirrup (2), be provided with mounting hole (3) on journal stirrup (2) so that the expansion drum is fixed on radiator (7). Installing the expansion drum on the radiator,can practicing thrift and arrange the space, and be favorable to whole turning mold massing, the unnecessary direct mount of expansion drum avoids the expansion drum to be hit the bits of broken glass by debris when the automobilism to the frame. In addition, the expansion drum passes through tube couplings such as rubber tube with the radiator, because the expansion drum direct mount on the radiator, can shorten the length of rubber tube greatly, when improving moisturizing efficiency, has avoided connecting the cracked problem of joint that results in because the expansion drum is pullled to traditional heat radiat