Abstract: A powertrain (10) and an electric vehicle (1) are disclosed. The powertrain (10) includes a die casting housing (100) and a heat exchanger (400), the die casting housing (100) includes a reducer accommodation cavity (111) formed inside the die casting housing (100) through die casting and four holes (170), and the reducer accommodation cavity (111) accommodates a reducer (200); and two holes (170) communicate with a liquid passage in the heat exchanger (400), the other two holes (170) communicate with an oil passage in the heat exchanger (400), openings of the four holes (170) all face the heat exchanger (400), the reducer accommodation cavity (111), the four holes (170), and the heat exchanger (400) are arranged along a first direction, the first direction is perpendicular to an axial direction of a motor (300).

Abstract: A power assembly and a vehicle in the field of driving technologies are provided. The power assembly includes a housing, a first rotating shaft, a second rotating shaft, and a preloaded part. The first rotating shaft is located in the housing by using two bearings, the second rotating shaft is located in the housing by using one bearing, and the second rotating shaft can slide in an axial direction. A first coupling portion is disposed on the first rotating shaft, a second coupling portion is disposed on the second rotating shaft, and the first coupling portion is coupled to the second coupling portion, so that the first rotating shaft and the second rotating shaft rotate synchronously.

Abstract: A supporting structure for a reverse countershaft of a transmission includes a transmission case, a partition wall and a boss, wherein the transmission case, the partition wall and the boss are formed integrally; a reverse idler gear installation space is provided between a side, close to a transmission main case, of the partition wall and the boss; and the partition wall is provided with a second reverse countershaft supporting hole and an auxiliary case countershaft supporting hole which are not concentric. In supporting structure for the reverse countershaft of the transmission, multiple ribs are used to support the boss of the reverse countershaft, the boss of the reverse intermediate shaft is cast until reaching the rear auxiliary case partition wall, and in combination with machining work, the reverse idle wheel space is milled by a disc milling cutter.

Abstract: A supporting structure for a reverse countershaft of a transmission includes a transmission case, a partition wall and a boss, wherein the transmission case, the partition wall and the boss are formed integrally; a reverse idler gear installation space is provided between a side, close to a transmission main case, of the partition wall and the boss; and the partition wall is provided with a second reverse countershaft supporting hole and an auxiliary case countershaft supporting hole which are not concentric. In supporting structure for the reverse countershaft of the transmission, multiple ribs are used to support the boss of the reverse countershaft, the boss of the reverse intermediate shaft is cast until reaching the rear auxiliary case partition wall, and in combination with machining work, the reverse idle wheel space is milled by a disc milling cutter.