Transmission, wheel drive axle assembly and vehicle

The invention relates to a transmission, a wheel-side drive axle assembly and a vehicle. The transmission comprises a first shell, a second shell, a first drive axle assembly, a second drive axle assembly, a third drive axle assembly, a fourth drive axle assembly and a fifth drive axle assembly, the speed change mechanism comprises a gear assembly and a bearing assembly which are arranged in the containing cavity, and the gear assembly is connected to the first shell and the second shell through the bearing assembly; and the lubricating oil channel comprises a shell oil channel arranged in the first shell and/or the second shell and a lubricating pipeline arranged in the containing cavity and communicated with the shell oil channel, and the shell oil channel and the lubricating pipeline are used for providing lubricating oil towards the gear assembly and the bearing assembly and used for lubricating and cooling the gear assembly and the bearing assembly. According to the transmission, the bearing and tooth surface failure risk caused by insufficient lubrication can be reduced, the liquid level of lubricating oil in the transmission can be remarkably reduced, the liquid level of the lubricating oil in the transmission can be lower than all gear assemblies and bearing assemblies when specific requirements exist, the oil stirring loss is greatly reduced, and the transmission efficiency of the transmission is improved.